Adjust to reflect 8.0-RELEASE.

[FreeBSD/releng/8.0.git] / sys / sparc64 / sparc64 / pmap.c

/*-
 * Copyright (c) 1991 Regents of the University of California.
 * All rights reserved.
 * Copyright (c) 1994 John S. Dyson
 * All rights reserved.
 * Copyright (c) 1994 David Greenman
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department and William Jolitz of UUNET Technologies Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      from:   @(#)pmap.c      7.7 (Berkeley)  5/12/91
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * Manages physical address maps.
 *
 * In addition to hardware address maps, this module is called upon to
 * provide software-use-only maps which may or may not be stored in the
 * same form as hardware maps.  These pseudo-maps are used to store
 * intermediate results from copy operations to and from address spaces.
 *
 * Since the information managed by this module is also stored by the
 * logical address mapping module, this module may throw away valid virtual
 * to physical mappings at almost any time.  However, invalidations of
 * mappings must be done as requested.
 *
 * In order to cope with hardware architectures which make virtual to
 * physical map invalidates expensive, this module may delay invalidate
 * reduced protection operations until such time as they are actually
 * necessary.  This module is given full information as to which processors
 * are currently using which maps, and to when physical maps must be made
 * correct.
 */

#include "opt_kstack_pages.h"
#include "opt_msgbuf.h"
#include "opt_pmap.h"

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/msgbuf.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/vmmeter.h>

#include <dev/ofw/openfirm.h>

#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/vm_pageout.h>
#include <vm/vm_pager.h>

#include <machine/cache.h>
#include <machine/frame.h>
#include <machine/instr.h>
#include <machine/md_var.h>
#include <machine/metadata.h>
#include <machine/ofw_mem.h>
#include <machine/smp.h>
#include <machine/tlb.h>
#include <machine/tte.h>
#include <machine/tsb.h>
#include <machine/ver.h>

#define PMAP_DEBUG

#ifndef PMAP_SHPGPERPROC
#define PMAP_SHPGPERPROC        200
#endif

/* XXX */
#include "opt_sched.h"
#ifndef SCHED_4BSD
#error "sparc64 only works with SCHED_4BSD which uses a global scheduler lock."
#endif
extern struct mtx sched_lock;

/*
 * Virtual address of message buffer
 */
struct msgbuf *msgbufp;

/*
 * Map of physical memory reagions
 */
vm_paddr_t phys_avail[128];
static struct ofw_mem_region mra[128];
struct ofw_mem_region sparc64_memreg[128];
int sparc64_nmemreg;
static struct ofw_map translations[128];
static int translations_size;

static vm_offset_t pmap_idle_map;
static vm_offset_t pmap_temp_map_1;
static vm_offset_t pmap_temp_map_2;

/*
 * First and last available kernel virtual addresses
 */
vm_offset_t virtual_avail;
vm_offset_t virtual_end;
vm_offset_t kernel_vm_end;

vm_offset_t vm_max_kernel_address;

/*
 * Kernel pmap
 */
struct pmap kernel_pmap_store;

/*
 * Allocate physical memory for use in pmap_bootstrap.
 */
static vm_paddr_t pmap_bootstrap_alloc(vm_size_t size);

/*
 * Map the given physical page at the specified virtual address in the
 * target pmap with the protection requested.  If specified the page
 * will be wired down.
 *
 * The page queues and pmap must be locked.
 */
static void pmap_enter_locked(pmap_t pm, vm_offset_t va, vm_page_t m,
    vm_prot_t prot, boolean_t wired);

extern int tl1_immu_miss_patch_1[];
extern int tl1_immu_miss_patch_2[];
extern int tl1_dmmu_miss_patch_1[];
extern int tl1_dmmu_miss_patch_2[];
extern int tl1_dmmu_prot_patch_1[];
extern int tl1_dmmu_prot_patch_2[];

/*
 * If user pmap is processed with pmap_remove and with pmap_remove and the
 * resident count drops to 0, there are no more pages to remove, so we
 * need not continue.
 */
#define PMAP_REMOVE_DONE(pm) \
        ((pm) != kernel_pmap && (pm)->pm_stats.resident_count == 0)

/*
 * The threshold (in bytes) above which tsb_foreach() is used in pmap_remove()
 * and pmap_protect() instead of trying each virtual address.
 */
#define PMAP_TSB_THRESH ((TSB_SIZE / 2) * PAGE_SIZE)

SYSCTL_NODE(_debug, OID_AUTO, pmap_stats, CTLFLAG_RD, 0, "");

PMAP_STATS_VAR(pmap_nenter);
PMAP_STATS_VAR(pmap_nenter_update);
PMAP_STATS_VAR(pmap_nenter_replace);
PMAP_STATS_VAR(pmap_nenter_new);
PMAP_STATS_VAR(pmap_nkenter);
PMAP_STATS_VAR(pmap_nkenter_oc);
PMAP_STATS_VAR(pmap_nkenter_stupid);
PMAP_STATS_VAR(pmap_nkremove);
PMAP_STATS_VAR(pmap_nqenter);
PMAP_STATS_VAR(pmap_nqremove);
PMAP_STATS_VAR(pmap_ncache_enter);
PMAP_STATS_VAR(pmap_ncache_enter_c);
PMAP_STATS_VAR(pmap_ncache_enter_oc);
PMAP_STATS_VAR(pmap_ncache_enter_cc);
PMAP_STATS_VAR(pmap_ncache_enter_coc);
PMAP_STATS_VAR(pmap_ncache_enter_nc);
PMAP_STATS_VAR(pmap_ncache_enter_cnc);
PMAP_STATS_VAR(pmap_ncache_remove);
PMAP_STATS_VAR(pmap_ncache_remove_c);
PMAP_STATS_VAR(pmap_ncache_remove_oc);
PMAP_STATS_VAR(pmap_ncache_remove_cc);
PMAP_STATS_VAR(pmap_ncache_remove_coc);
PMAP_STATS_VAR(pmap_ncache_remove_nc);
PMAP_STATS_VAR(pmap_nzero_page);
PMAP_STATS_VAR(pmap_nzero_page_c);
PMAP_STATS_VAR(pmap_nzero_page_oc);
PMAP_STATS_VAR(pmap_nzero_page_nc);
PMAP_STATS_VAR(pmap_nzero_page_area);
PMAP_STATS_VAR(pmap_nzero_page_area_c);
PMAP_STATS_VAR(pmap_nzero_page_area_oc);
PMAP_STATS_VAR(pmap_nzero_page_area_nc);
PMAP_STATS_VAR(pmap_nzero_page_idle);
PMAP_STATS_VAR(pmap_nzero_page_idle_c);
PMAP_STATS_VAR(pmap_nzero_page_idle_oc);
PMAP_STATS_VAR(pmap_nzero_page_idle_nc);
PMAP_STATS_VAR(pmap_ncopy_page);
PMAP_STATS_VAR(pmap_ncopy_page_c);
PMAP_STATS_VAR(pmap_ncopy_page_oc);
PMAP_STATS_VAR(pmap_ncopy_page_nc);
PMAP_STATS_VAR(pmap_ncopy_page_dc);
PMAP_STATS_VAR(pmap_ncopy_page_doc);
PMAP_STATS_VAR(pmap_ncopy_page_sc);
PMAP_STATS_VAR(pmap_ncopy_page_soc);

PMAP_STATS_VAR(pmap_nnew_thread);
PMAP_STATS_VAR(pmap_nnew_thread_oc);

/*
 * Quick sort callout for comparing memory regions
 */
static int mr_cmp(const void *a, const void *b);
static int om_cmp(const void *a, const void *b);
static int
mr_cmp(const void *a, const void *b)
{
        const struct ofw_mem_region *mra;
        const struct ofw_mem_region *mrb;

        mra = a;
        mrb = b;
        if (mra->mr_start < mrb->mr_start)
                return (-1);
        else if (mra->mr_start > mrb->mr_start)
                return (1);
        else
                return (0);
}
static int
om_cmp(const void *a, const void *b)
{
        const struct ofw_map *oma;
        const struct ofw_map *omb;

        oma = a;
        omb = b;
        if (oma->om_start < omb->om_start)
                return (-1);
        else if (oma->om_start > omb->om_start)
                return (1);
        else
                return (0);
}

/*
 * Bootstrap the system enough to run with virtual memory.
 */
void
pmap_bootstrap(void)
{
        struct pmap *pm;
        struct tte *tp;
        vm_offset_t off;
        vm_offset_t va;
        vm_paddr_t pa;
        vm_size_t physsz;
        vm_size_t virtsz;
        phandle_t pmem;
        phandle_t vmem;
        int sz;
        int i;
        int j;

        /*
         * Find out what physical memory is available from the PROM and
         * initialize the phys_avail array.  This must be done before
         * pmap_bootstrap_alloc is called.
         */
        if ((pmem = OF_finddevice("/memory")) == -1)
                panic("pmap_bootstrap: finddevice /memory");
        if ((sz = OF_getproplen(pmem, "available")) == -1)
                panic("pmap_bootstrap: getproplen /memory/available");
        if (sizeof(phys_avail) < sz)
                panic("pmap_bootstrap: phys_avail too small");
        if (sizeof(mra) < sz)
                panic("pmap_bootstrap: mra too small");
        bzero(mra, sz);
        if (OF_getprop(pmem, "available", mra, sz) == -1)
                panic("pmap_bootstrap: getprop /memory/available");
        sz /= sizeof(*mra);
        CTR0(KTR_PMAP, "pmap_bootstrap: physical memory");
        qsort(mra, sz, sizeof (*mra), mr_cmp);
        physsz = 0;
        getenv_quad("hw.physmem", &physmem);
        physmem = btoc(physmem);
        for (i = 0, j = 0; i < sz; i++, j += 2) {
                CTR2(KTR_PMAP, "start=%#lx size=%#lx", mra[i].mr_start,
                    mra[i].mr_size);
                if (physmem != 0 && btoc(physsz + mra[i].mr_size) >= physmem) {
                        if (btoc(physsz) < physmem) {
                                phys_avail[j] = mra[i].mr_start;
                                phys_avail[j + 1] = mra[i].mr_start +
                                    (ctob(physmem) - physsz);
                                physsz = ctob(physmem);
                        }
                        break;
                }
                phys_avail[j] = mra[i].mr_start;
                phys_avail[j + 1] = mra[i].mr_start + mra[i].mr_size;
                physsz += mra[i].mr_size;
        }
        physmem = btoc(physsz);

        /*
         * Calculate the size of kernel virtual memory, and the size and mask
         * for the kernel TSB based on the phsyical memory size but limited
         * by letting the kernel TSB take up no more than half of the dTLB
         * slots available for locked entries.
         */
        virtsz = roundup(physsz, PAGE_SIZE_4M << (PAGE_SHIFT - TTE_SHIFT));
        virtsz = MIN(virtsz,
            (dtlb_slots / 2 * PAGE_SIZE_4M) << (PAGE_SHIFT - TTE_SHIFT));
        vm_max_kernel_address = VM_MIN_KERNEL_ADDRESS + virtsz;
        tsb_kernel_size = virtsz >> (PAGE_SHIFT - TTE_SHIFT);
        tsb_kernel_mask = (tsb_kernel_size >> TTE_SHIFT) - 1;

        if (kernel_tlb_slots + PCPU_PAGES + tsb_kernel_size / PAGE_SIZE_4M +
            1 /* PROM page */ + 1 /* spare */ > dtlb_slots)
                panic("pmap_bootstrap: insufficient dTLB entries");
        if (kernel_tlb_slots + 1 /* PROM page */ + 1 /* spare */ > itlb_slots)
                panic("pmap_bootstrap: insufficient iTLB entries");

        /*
         * Allocate the kernel TSB and lock it in the TLB.
         */
        pa = pmap_bootstrap_alloc(tsb_kernel_size);
        if (pa & PAGE_MASK_4M)
                panic("pmap_bootstrap: tsb unaligned\n");
        tsb_kernel_phys = pa;
        tsb_kernel = (struct tte *)(VM_MIN_KERNEL_ADDRESS - tsb_kernel_size);
        pmap_map_tsb();
        bzero(tsb_kernel, tsb_kernel_size);

        /*
         * Allocate and map the dynamic per-CPU area for the BSP.
         */
        pa = pmap_bootstrap_alloc(DPCPU_SIZE);
        dpcpu0 = (void *)TLB_PHYS_TO_DIRECT(pa);

        /*
         * Allocate and map the message buffer.
         */
        pa = pmap_bootstrap_alloc(MSGBUF_SIZE);
        msgbufp = (struct msgbuf *)TLB_PHYS_TO_DIRECT(pa);

        /*
         * Patch the virtual address and the tsb mask into the trap table.
         */

#define SETHI(rd, imm22) \
        (EIF_OP(IOP_FORM2) | EIF_F2_RD(rd) | EIF_F2_OP2(INS0_SETHI) | \
            EIF_IMM((imm22) >> 10, 22))
#define OR_R_I_R(rd, imm13, rs1) \
        (EIF_OP(IOP_MISC) | EIF_F3_RD(rd) | EIF_F3_OP3(INS2_OR) | \
            EIF_F3_RS1(rs1) | EIF_F3_I(1) | EIF_IMM(imm13, 13))

#define PATCH(addr) do { \
        if (addr[0] != SETHI(IF_F2_RD(addr[0]), 0x0) || \
            addr[1] != OR_R_I_R(IF_F3_RD(addr[1]), 0x0, IF_F3_RS1(addr[1])) || \
            addr[2] != SETHI(IF_F2_RD(addr[2]), 0x0)) \
                panic("pmap_boostrap: patched instructions have changed"); \
        addr[0] |= EIF_IMM((tsb_kernel_mask) >> 10, 22); \
        addr[1] |= EIF_IMM(tsb_kernel_mask, 10); \
        addr[2] |= EIF_IMM(((vm_offset_t)tsb_kernel) >> 10, 22); \
        flush(addr); \
        flush(addr + 1); \
        flush(addr + 2); \
} while (0)

        PATCH(tl1_immu_miss_patch_1);
        PATCH(tl1_immu_miss_patch_2);
        PATCH(tl1_dmmu_miss_patch_1);
        PATCH(tl1_dmmu_miss_patch_2);
        PATCH(tl1_dmmu_prot_patch_1);
        PATCH(tl1_dmmu_prot_patch_2);

        /*
         * Enter fake 8k pages for the 4MB kernel pages, so that
         * pmap_kextract() will work for them.
         */
        for (i = 0; i < kernel_tlb_slots; i++) {
                pa = kernel_tlbs[i].te_pa;
                va = kernel_tlbs[i].te_va;
                for (off = 0; off < PAGE_SIZE_4M; off += PAGE_SIZE) {
                        tp = tsb_kvtotte(va + off);
                        tp->tte_vpn = TV_VPN(va + off, TS_8K);
                        tp->tte_data = TD_V | TD_8K | TD_PA(pa + off) |
                            TD_REF | TD_SW | TD_CP | TD_CV | TD_P | TD_W;
                }
        }

        /*
         * Set the start and end of KVA.  The kernel is loaded starting
         * at the first available 4MB super page, so we advance to the
         * end of the last one used for it.
         */
        virtual_avail = KERNBASE + kernel_tlb_slots * PAGE_SIZE_4M;
        virtual_end = vm_max_kernel_address;
        kernel_vm_end = vm_max_kernel_address;

        /*
         * Allocate kva space for temporary mappings.
         */
        pmap_idle_map = virtual_avail;
        virtual_avail += PAGE_SIZE * DCACHE_COLORS;
        pmap_temp_map_1 = virtual_avail;
        virtual_avail += PAGE_SIZE * DCACHE_COLORS;
        pmap_temp_map_2 = virtual_avail;
        virtual_avail += PAGE_SIZE * DCACHE_COLORS;

        /*
         * Allocate a kernel stack with guard page for thread0 and map it
         * into the kernel TSB.  We must ensure that the virtual address is
         * coloured properly, since we're allocating from phys_avail so the
         * memory won't have an associated vm_page_t.
         */
        pa = pmap_bootstrap_alloc(KSTACK_PAGES * PAGE_SIZE);
        kstack0_phys = pa;
        virtual_avail += roundup(KSTACK_GUARD_PAGES, DCACHE_COLORS) *
            PAGE_SIZE;
        kstack0 = virtual_avail;
        virtual_avail += roundup(KSTACK_PAGES, DCACHE_COLORS) * PAGE_SIZE;
        KASSERT(DCACHE_COLOR(kstack0) == DCACHE_COLOR(kstack0_phys),
            ("pmap_bootstrap: kstack0 miscoloured"));
        for (i = 0; i < KSTACK_PAGES; i++) {
                pa = kstack0_phys + i * PAGE_SIZE;
                va = kstack0 + i * PAGE_SIZE;
                tp = tsb_kvtotte(va);
                tp->tte_vpn = TV_VPN(va, TS_8K);
                tp->tte_data = TD_V | TD_8K | TD_PA(pa) | TD_REF | TD_SW |
                    TD_CP | TD_CV | TD_P | TD_W;
        }

        /*
         * Calculate the last available physical address.
         */
        for (i = 0; phys_avail[i + 2] != 0; i += 2)
                ;
        Maxmem = sparc64_btop(phys_avail[i + 1]);

        /*
         * Add the PROM mappings to the kernel TSB.
         */
        if ((vmem = OF_finddevice("/virtual-memory")) == -1)
                panic("pmap_bootstrap: finddevice /virtual-memory");
        if ((sz = OF_getproplen(vmem, "translations")) == -1)
                panic("pmap_bootstrap: getproplen translations");
        if (sizeof(translations) < sz)
                panic("pmap_bootstrap: translations too small");
        bzero(translations, sz);
        if (OF_getprop(vmem, "translations", translations, sz) == -1)
                panic("pmap_bootstrap: getprop /virtual-memory/translations");
        sz /= sizeof(*translations);
        translations_size = sz;
        CTR0(KTR_PMAP, "pmap_bootstrap: translations");
        qsort(translations, sz, sizeof (*translations), om_cmp);
        for (i = 0; i < sz; i++) {
                CTR3(KTR_PMAP,
                    "translation: start=%#lx size=%#lx tte=%#lx",
                    translations[i].om_start, translations[i].om_size,
                    translations[i].om_tte);
                if ((translations[i].om_tte & TD_V) == 0)
                        continue;
                if (translations[i].om_start < VM_MIN_PROM_ADDRESS ||
                    translations[i].om_start > VM_MAX_PROM_ADDRESS)
                        continue;
                for (off = 0; off < translations[i].om_size;
                    off += PAGE_SIZE) {
                        va = translations[i].om_start + off;
                        tp = tsb_kvtotte(va);
                        tp->tte_vpn = TV_VPN(va, TS_8K);
                        tp->tte_data =
                            ((translations[i].om_tte &
                            ~((TD_SOFT2_MASK << TD_SOFT2_SHIFT) |
                            (cpu_impl < CPU_IMPL_ULTRASPARCIII ?
                            (TD_DIAG_SF_MASK << TD_DIAG_SF_SHIFT) :
                            (TD_RSVD_CH_MASK << TD_RSVD_CH_SHIFT)) |
                            (TD_SOFT_MASK << TD_SOFT_SHIFT))) | TD_EXEC) +
                            off;
                }
        }

        /*
         * Get the available physical memory ranges from /memory/reg.  These
         * are only used for kernel dumps, but it may not be wise to do PROM
         * calls in that situation.
         */
        if ((sz = OF_getproplen(pmem, "reg")) == -1)
                panic("pmap_bootstrap: getproplen /memory/reg");
        if (sizeof(sparc64_memreg) < sz)
                panic("pmap_bootstrap: sparc64_memreg too small");
        if (OF_getprop(pmem, "reg", sparc64_memreg, sz) == -1)
                panic("pmap_bootstrap: getprop /memory/reg");
        sparc64_nmemreg = sz / sizeof(*sparc64_memreg);

        /*
         * Initialize the kernel pmap (which is statically allocated).
         * NOTE: PMAP_LOCK_INIT() is needed as part of the initialization
         * but sparc64 start up is not ready to initialize mutexes yet.
         * It is called in machdep.c.
         */
        pm = kernel_pmap;
        for (i = 0; i < MAXCPU; i++)
                pm->pm_context[i] = TLB_CTX_KERNEL;
        pm->pm_active = ~0;

        /*
         * Flush all non-locked TLB entries possibly left over by the
         * firmware.
         */
        tlb_flush_nonlocked();
}

void
pmap_map_tsb(void)
{
        vm_offset_t va;
        vm_paddr_t pa;
        u_long data;
        register_t s;
        int i;

        s = intr_disable();

        /*
         * Map the 4MB TSB pages.
         */
        for (i = 0; i < tsb_kernel_size; i += PAGE_SIZE_4M) {
                va = (vm_offset_t)tsb_kernel + i;
                pa = tsb_kernel_phys + i;
                data = TD_V | TD_4M | TD_PA(pa) | TD_L | TD_CP | TD_CV |
                    TD_P | TD_W;
                stxa(AA_DMMU_TAR, ASI_DMMU, TLB_TAR_VA(va) |
                    TLB_TAR_CTX(TLB_CTX_KERNEL));
                stxa_sync(0, ASI_DTLB_DATA_IN_REG, data);
        }

        /*
         * Set the secondary context to be the kernel context (needed for
         * FP block operations in the kernel).
         */
        stxa(AA_DMMU_SCXR, ASI_DMMU, (ldxa(AA_DMMU_SCXR, ASI_DMMU) &
            TLB_SCXR_PGSZ_MASK) | TLB_CTX_KERNEL);
        flush(KERNBASE);

        intr_restore(s);
}

/*
 * Allocate a physical page of memory directly from the phys_avail map.
 * Can only be called from pmap_bootstrap before avail start and end are
 * calculated.
 */
static vm_paddr_t
pmap_bootstrap_alloc(vm_size_t size)
{
        vm_paddr_t pa;
        int i;

        size = roundup(size, PAGE_SIZE * DCACHE_COLORS);
        for (i = 0; phys_avail[i + 1] != 0; i += 2) {
                if (phys_avail[i + 1] - phys_avail[i] < size)
                        continue;
                pa = phys_avail[i];
                phys_avail[i] += size;
                return (pa);
        }
        panic("pmap_bootstrap_alloc");
}

/*
 * Initialize a vm_page's machine-dependent fields.
 */
void
pmap_page_init(vm_page_t m)
{

        TAILQ_INIT(&m->md.tte_list);
        m->md.color = DCACHE_COLOR(VM_PAGE_TO_PHYS(m));
        m->md.flags = 0;
        m->md.pmap = NULL;
}

/*
 * Initialize the pmap module.
 */
void
pmap_init(void)
{
        vm_offset_t addr;
        vm_size_t size;
        int result;
        int i;

        for (i = 0; i < translations_size; i++) {
                addr = translations[i].om_start;
                size = translations[i].om_size;
                if ((translations[i].om_tte & TD_V) == 0)
                        continue;
                if (addr < VM_MIN_PROM_ADDRESS || addr > VM_MAX_PROM_ADDRESS)
                        continue;
                result = vm_map_find(kernel_map, NULL, 0, &addr, size,
                    VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, MAP_NOFAULT);
                if (result != KERN_SUCCESS || addr != translations[i].om_start)
                        panic("pmap_init: vm_map_find");
        }
}

/*
 * Extract the physical page address associated with the given
 * map/virtual_address pair.
 */
vm_paddr_t
pmap_extract(pmap_t pm, vm_offset_t va)
{
        struct tte *tp;
        vm_paddr_t pa;

        if (pm == kernel_pmap)
                return (pmap_kextract(va));
        PMAP_LOCK(pm);
        tp = tsb_tte_lookup(pm, va);
        if (tp == NULL)
                pa = 0;
        else
                pa = TTE_GET_PA(tp) | (va & TTE_GET_PAGE_MASK(tp));
        PMAP_UNLOCK(pm);
        return (pa);
}

/*
 * Atomically extract and hold the physical page with the given
 * pmap and virtual address pair if that mapping permits the given
 * protection.
 */
vm_page_t
pmap_extract_and_hold(pmap_t pm, vm_offset_t va, vm_prot_t prot)
{
        struct tte *tp;
        vm_page_t m;

        m = NULL;
        vm_page_lock_queues();
        if (pm == kernel_pmap) {
                if (va >= VM_MIN_DIRECT_ADDRESS) {
                        tp = NULL;
                        m = PHYS_TO_VM_PAGE(TLB_DIRECT_TO_PHYS(va));
                        vm_page_hold(m);
                } else {
                        tp = tsb_kvtotte(va);
                        if ((tp->tte_data & TD_V) == 0)
                                tp = NULL;
                }
        } else {
                PMAP_LOCK(pm);
                tp = tsb_tte_lookup(pm, va);
        }
        if (tp != NULL && ((tp->tte_data & TD_SW) ||
            (prot & VM_PROT_WRITE) == 0)) {
                m = PHYS_TO_VM_PAGE(TTE_GET_PA(tp));
                vm_page_hold(m);
        }
        vm_page_unlock_queues();
        if (pm != kernel_pmap)
                PMAP_UNLOCK(pm);
        return (m);
}

/*
 * Extract the physical page address associated with the given kernel virtual
 * address.
 */
vm_paddr_t
pmap_kextract(vm_offset_t va)
{
        struct tte *tp;

        if (va >= VM_MIN_DIRECT_ADDRESS)
                return (TLB_DIRECT_TO_PHYS(va));
        tp = tsb_kvtotte(va);
        if ((tp->tte_data & TD_V) == 0)
                return (0);
        return (TTE_GET_PA(tp) | (va & TTE_GET_PAGE_MASK(tp)));
}

int
pmap_cache_enter(vm_page_t m, vm_offset_t va)
{
        struct tte *tp;
        int color;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        KASSERT((m->flags & PG_FICTITIOUS) == 0,
            ("pmap_cache_enter: fake page"));
        PMAP_STATS_INC(pmap_ncache_enter);

        /*
         * Find the color for this virtual address and note the added mapping.
         */
        color = DCACHE_COLOR(va);
        m->md.colors[color]++;

        /*
         * If all existing mappings have the same color, the mapping is
         * cacheable.
         */
        if (m->md.color == color) {
                KASSERT(m->md.colors[DCACHE_OTHER_COLOR(color)] == 0,
                    ("pmap_cache_enter: cacheable, mappings of other color"));
                if (m->md.color == DCACHE_COLOR(VM_PAGE_TO_PHYS(m)))
                        PMAP_STATS_INC(pmap_ncache_enter_c);
                else
                        PMAP_STATS_INC(pmap_ncache_enter_oc);
                return (1);
        }

        /*
         * If there are no mappings of the other color, and the page still has
         * the wrong color, this must be a new mapping.  Change the color to
         * match the new mapping, which is cacheable.  We must flush the page
         * from the cache now.
         */
        if (m->md.colors[DCACHE_OTHER_COLOR(color)] == 0) {
                KASSERT(m->md.colors[color] == 1,
                    ("pmap_cache_enter: changing color, not new mapping"));
                dcache_page_inval(VM_PAGE_TO_PHYS(m));
                m->md.color = color;
                if (m->md.color == DCACHE_COLOR(VM_PAGE_TO_PHYS(m)))
                        PMAP_STATS_INC(pmap_ncache_enter_cc);
                else
                        PMAP_STATS_INC(pmap_ncache_enter_coc);
                return (1);
        }

        /*
         * If the mapping is already non-cacheable, just return.
         */
        if (m->md.color == -1) {
                PMAP_STATS_INC(pmap_ncache_enter_nc);
                return (0);
        }

        PMAP_STATS_INC(pmap_ncache_enter_cnc);

        /*
         * Mark all mappings as uncacheable, flush any lines with the other
         * color out of the dcache, and set the color to none (-1).
         */
        TAILQ_FOREACH(tp, &m->md.tte_list, tte_link) {
                atomic_clear_long(&tp->tte_data, TD_CV);
                tlb_page_demap(TTE_GET_PMAP(tp), TTE_GET_VA(tp));
        }
        dcache_page_inval(VM_PAGE_TO_PHYS(m));
        m->md.color = -1;
        return (0);
}

void
pmap_cache_remove(vm_page_t m, vm_offset_t va)
{
        struct tte *tp;
        int color;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        CTR3(KTR_PMAP, "pmap_cache_remove: m=%p va=%#lx c=%d", m, va,
            m->md.colors[DCACHE_COLOR(va)]);
        KASSERT((m->flags & PG_FICTITIOUS) == 0,
            ("pmap_cache_remove: fake page"));
        KASSERT(m->md.colors[DCACHE_COLOR(va)] > 0,
            ("pmap_cache_remove: no mappings %d <= 0",
            m->md.colors[DCACHE_COLOR(va)]));
        PMAP_STATS_INC(pmap_ncache_remove);

        /*
         * Find the color for this virtual address and note the removal of
         * the mapping.
         */
        color = DCACHE_COLOR(va);
        m->md.colors[color]--;

        /*
         * If the page is cacheable, just return and keep the same color, even
         * if there are no longer any mappings.
         */
        if (m->md.color != -1) {
                if (m->md.color == DCACHE_COLOR(VM_PAGE_TO_PHYS(m)))
                        PMAP_STATS_INC(pmap_ncache_remove_c);
                else
                        PMAP_STATS_INC(pmap_ncache_remove_oc);
                return;
        }

        KASSERT(m->md.colors[DCACHE_OTHER_COLOR(color)] != 0,
            ("pmap_cache_remove: uncacheable, no mappings of other color"));

        /*
         * If the page is not cacheable (color is -1), and the number of
         * mappings for this color is not zero, just return.  There are
         * mappings of the other color still, so remain non-cacheable.
         */
        if (m->md.colors[color] != 0) {
                PMAP_STATS_INC(pmap_ncache_remove_nc);
                return;
        }

        /*
         * The number of mappings for this color is now zero.  Recache the
         * other colored mappings, and change the page color to the other
         * color.  There should be no lines in the data cache for this page,
         * so flushing should not be needed.
         */
        TAILQ_FOREACH(tp, &m->md.tte_list, tte_link) {
                atomic_set_long(&tp->tte_data, TD_CV);
                tlb_page_demap(TTE_GET_PMAP(tp), TTE_GET_VA(tp));
        }
        m->md.color = DCACHE_OTHER_COLOR(color);

        if (m->md.color == DCACHE_COLOR(VM_PAGE_TO_PHYS(m)))
                PMAP_STATS_INC(pmap_ncache_remove_cc);
        else
                PMAP_STATS_INC(pmap_ncache_remove_coc);
}

/*
 * Map a wired page into kernel virtual address space.
 */
void
pmap_kenter(vm_offset_t va, vm_page_t m)
{
        vm_offset_t ova;
        struct tte *tp;
        vm_page_t om;
        u_long data;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        PMAP_STATS_INC(pmap_nkenter);
        tp = tsb_kvtotte(va);
        CTR4(KTR_PMAP, "pmap_kenter: va=%#lx pa=%#lx tp=%p data=%#lx",
            va, VM_PAGE_TO_PHYS(m), tp, tp->tte_data);
        if (DCACHE_COLOR(VM_PAGE_TO_PHYS(m)) != DCACHE_COLOR(va)) {
                CTR5(KTR_CT2,
        "pmap_kenter: off colour va=%#lx pa=%#lx o=%p ot=%d pi=%#lx",
                    va, VM_PAGE_TO_PHYS(m), m->object,
                    m->object ? m->object->type : -1,
                    m->pindex);
                PMAP_STATS_INC(pmap_nkenter_oc);
        }
        if ((tp->tte_data & TD_V) != 0) {
                om = PHYS_TO_VM_PAGE(TTE_GET_PA(tp));
                ova = TTE_GET_VA(tp);
                if (m == om && va == ova) {
                        PMAP_STATS_INC(pmap_nkenter_stupid);
                        return;
                }
                TAILQ_REMOVE(&om->md.tte_list, tp, tte_link);
                pmap_cache_remove(om, ova);
                if (va != ova)
                        tlb_page_demap(kernel_pmap, ova);
        }
        data = TD_V | TD_8K | VM_PAGE_TO_PHYS(m) | TD_REF | TD_SW | TD_CP |
            TD_P | TD_W;
        if (pmap_cache_enter(m, va) != 0)
                data |= TD_CV;
        tp->tte_vpn = TV_VPN(va, TS_8K);
        tp->tte_data = data;
        TAILQ_INSERT_TAIL(&m->md.tte_list, tp, tte_link);
}

/*
 * Map a wired page into kernel virtual address space.  This additionally
 * takes a flag argument wich is or'ed to the TTE data.  This is used by
 * sparc64_bus_mem_map().
 * NOTE: if the mapping is non-cacheable, it's the caller's responsibility
 * to flush entries that might still be in the cache, if applicable.
 */
void
pmap_kenter_flags(vm_offset_t va, vm_paddr_t pa, u_long flags)
{
        struct tte *tp;

        tp = tsb_kvtotte(va);
        CTR4(KTR_PMAP, "pmap_kenter_flags: va=%#lx pa=%#lx tp=%p data=%#lx",
            va, pa, tp, tp->tte_data);
        tp->tte_vpn = TV_VPN(va, TS_8K);
        tp->tte_data = TD_V | TD_8K | TD_PA(pa) | TD_REF | TD_P | flags;
}

/*
 * Remove a wired page from kernel virtual address space.
 */
void
pmap_kremove(vm_offset_t va)
{
        struct tte *tp;
        vm_page_t m;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        PMAP_STATS_INC(pmap_nkremove);
        tp = tsb_kvtotte(va);
        CTR3(KTR_PMAP, "pmap_kremove: va=%#lx tp=%p data=%#lx", va, tp,
            tp->tte_data);
        if ((tp->tte_data & TD_V) == 0)
                return;
        m = PHYS_TO_VM_PAGE(TTE_GET_PA(tp));
        TAILQ_REMOVE(&m->md.tte_list, tp, tte_link);
        pmap_cache_remove(m, va);
        TTE_ZERO(tp);
}

/*
 * Inverse of pmap_kenter_flags, used by bus_space_unmap().
 */
void
pmap_kremove_flags(vm_offset_t va)
{
        struct tte *tp;

        tp = tsb_kvtotte(va);
        CTR3(KTR_PMAP, "pmap_kremove_flags: va=%#lx tp=%p data=%#lx", va, tp,
            tp->tte_data);
        TTE_ZERO(tp);
}

/*
 * Map a range of physical addresses into kernel virtual address space.
 *
 * The value passed in *virt is a suggested virtual address for the mapping.
 * Architectures which can support a direct-mapped physical to virtual region
 * can return the appropriate address within that region, leaving '*virt'
 * unchanged.
 */
vm_offset_t
pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot)
{

        return (TLB_PHYS_TO_DIRECT(start));
}

/*
 * Map a list of wired pages into kernel virtual address space.  This is
 * intended for temporary mappings which do not need page modification or
 * references recorded.  Existing mappings in the region are overwritten.
 */
void
pmap_qenter(vm_offset_t sva, vm_page_t *m, int count)
{
        vm_offset_t va;
        int locked;

        PMAP_STATS_INC(pmap_nqenter);
        va = sva;
        if (!(locked = mtx_owned(&vm_page_queue_mtx)))
                vm_page_lock_queues();
        while (count-- > 0) {
                pmap_kenter(va, *m);
                va += PAGE_SIZE;
                m++;
        }
        if (!locked)
                vm_page_unlock_queues();
        tlb_range_demap(kernel_pmap, sva, va);
}

/*
 * Remove page mappings from kernel virtual address space.  Intended for
 * temporary mappings entered by pmap_qenter.
 */
void
pmap_qremove(vm_offset_t sva, int count)
{
        vm_offset_t va;
        int locked;

        PMAP_STATS_INC(pmap_nqremove);
        va = sva;
        if (!(locked = mtx_owned(&vm_page_queue_mtx)))
                vm_page_lock_queues();
        while (count-- > 0) {
                pmap_kremove(va);
                va += PAGE_SIZE;
        }
        if (!locked)
                vm_page_unlock_queues();
        tlb_range_demap(kernel_pmap, sva, va);
}

/*
 * Initialize the pmap associated with process 0.
 */
void
pmap_pinit0(pmap_t pm)
{
        int i;

        PMAP_LOCK_INIT(pm);
        for (i = 0; i < MAXCPU; i++)
                pm->pm_context[i] = 0;
        pm->pm_active = 0;
        pm->pm_tsb = NULL;
        pm->pm_tsb_obj = NULL;
        bzero(&pm->pm_stats, sizeof(pm->pm_stats));
}

/*
 * Initialize a preallocated and zeroed pmap structure, such as one in a
 * vmspace structure.
 */
int
pmap_pinit(pmap_t pm)
{
        vm_page_t ma[TSB_PAGES];
        vm_page_t m;
        int i;

        PMAP_LOCK_INIT(pm);

        /*
         * Allocate KVA space for the TSB.
         */
        if (pm->pm_tsb == NULL) {
                pm->pm_tsb = (struct tte *)kmem_alloc_nofault(kernel_map,
                    TSB_BSIZE);
                if (pm->pm_tsb == NULL) {
                        PMAP_LOCK_DESTROY(pm);
                        return (0);
                }
        }

        /*
         * Allocate an object for it.
         */
        if (pm->pm_tsb_obj == NULL)
                pm->pm_tsb_obj = vm_object_allocate(OBJT_DEFAULT, TSB_PAGES);

        VM_OBJECT_LOCK(pm->pm_tsb_obj);
        for (i = 0; i < TSB_PAGES; i++) {
                m = vm_page_grab(pm->pm_tsb_obj, i, VM_ALLOC_NOBUSY |
                    VM_ALLOC_RETRY | VM_ALLOC_WIRED | VM_ALLOC_ZERO);
                m->valid = VM_PAGE_BITS_ALL;
                m->md.pmap = pm;
                ma[i] = m;
        }
        VM_OBJECT_UNLOCK(pm->pm_tsb_obj);
        pmap_qenter((vm_offset_t)pm->pm_tsb, ma, TSB_PAGES);

        for (i = 0; i < MAXCPU; i++)
                pm->pm_context[i] = -1;
        pm->pm_active = 0;
        bzero(&pm->pm_stats, sizeof(pm->pm_stats));
        return (1);
}

/*
 * Release any resources held by the given physical map.
 * Called when a pmap initialized by pmap_pinit is being released.
 * Should only be called if the map contains no valid mappings.
 */
void
pmap_release(pmap_t pm)
{
        vm_object_t obj;
        vm_page_t m;
        struct pcpu *pc;

        CTR2(KTR_PMAP, "pmap_release: ctx=%#x tsb=%p",
            pm->pm_context[curcpu], pm->pm_tsb);
        KASSERT(pmap_resident_count(pm) == 0,
            ("pmap_release: resident pages %ld != 0",
            pmap_resident_count(pm)));

        /*
         * After the pmap was freed, it might be reallocated to a new process.
         * When switching, this might lead us to wrongly assume that we need
         * not switch contexts because old and new pmap pointer are equal.
         * Therefore, make sure that this pmap is not referenced by any PCPU
         * pointer any more.  This could happen in two cases:
         * - A process that referenced the pmap is currently exiting on a CPU.
         *   However, it is guaranteed to not switch in any more after setting
         *   its state to PRS_ZOMBIE.
         * - A process that referenced this pmap ran on a CPU, but we switched
         *   to a kernel thread, leaving the pmap pointer unchanged.
         */
        mtx_lock_spin(&sched_lock);
        SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
                if (pc->pc_pmap == pm)
                        pc->pc_pmap = NULL;
        }
        mtx_unlock_spin(&sched_lock);

        obj = pm->pm_tsb_obj;
        VM_OBJECT_LOCK(obj);
        KASSERT(obj->ref_count == 1, ("pmap_release: tsbobj ref count != 1"));
        while (!TAILQ_EMPTY(&obj->memq)) {
                m = TAILQ_FIRST(&obj->memq);
                vm_page_lock_queues();
                if (vm_page_sleep_if_busy(m, FALSE, "pmaprl"))
                        continue;
                KASSERT(m->hold_count == 0,
                    ("pmap_release: freeing held tsb page"));
                m->md.pmap = NULL;
                m->wire_count--;
                atomic_subtract_int(&cnt.v_wire_count, 1);
                vm_page_free_zero(m);
                vm_page_unlock_queues();
        }
        VM_OBJECT_UNLOCK(obj);
        pmap_qremove((vm_offset_t)pm->pm_tsb, TSB_PAGES);
        PMAP_LOCK_DESTROY(pm);
}

/*
 * Grow the number of kernel page table entries.  Unneeded.
 */
void
pmap_growkernel(vm_offset_t addr)
{

        panic("pmap_growkernel: can't grow kernel");
}

int
pmap_remove_tte(struct pmap *pm, struct pmap *pm2, struct tte *tp,
                vm_offset_t va)
{
        vm_page_t m;
        u_long data;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        data = atomic_readandclear_long(&tp->tte_data);
        if ((data & TD_FAKE) == 0) {
                m = PHYS_TO_VM_PAGE(TD_PA(data));
                TAILQ_REMOVE(&m->md.tte_list, tp, tte_link);
                if ((data & TD_WIRED) != 0)
                        pm->pm_stats.wired_count--;
                if ((data & TD_PV) != 0) {
                        if ((data & TD_W) != 0)
                                vm_page_dirty(m);
                        if ((data & TD_REF) != 0)
                                vm_page_flag_set(m, PG_REFERENCED);
                        if (TAILQ_EMPTY(&m->md.tte_list))
                                vm_page_flag_clear(m, PG_WRITEABLE);
                        pm->pm_stats.resident_count--;
                }
                pmap_cache_remove(m, va);
        }
        TTE_ZERO(tp);
        if (PMAP_REMOVE_DONE(pm))
                return (0);
        return (1);
}

/*
 * Remove the given range of addresses from the specified map.
 */
void
pmap_remove(pmap_t pm, vm_offset_t start, vm_offset_t end)
{
        struct tte *tp;
        vm_offset_t va;

        CTR3(KTR_PMAP, "pmap_remove: ctx=%#lx start=%#lx end=%#lx",
            pm->pm_context[curcpu], start, end);
        if (PMAP_REMOVE_DONE(pm))
                return;
        vm_page_lock_queues();
        PMAP_LOCK(pm);
        if (end - start > PMAP_TSB_THRESH) {
                tsb_foreach(pm, NULL, start, end, pmap_remove_tte);
                tlb_context_demap(pm);
        } else {
                for (va = start; va < end; va += PAGE_SIZE) {
                        if ((tp = tsb_tte_lookup(pm, va)) != NULL) {
                                if (!pmap_remove_tte(pm, NULL, tp, va))
                                        break;
                        }
                }
                tlb_range_demap(pm, start, end - 1);
        }
        PMAP_UNLOCK(pm);
        vm_page_unlock_queues();
}

void
pmap_remove_all(vm_page_t m)
{
        struct pmap *pm;
        struct tte *tpn;
        struct tte *tp;
        vm_offset_t va;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        for (tp = TAILQ_FIRST(&m->md.tte_list); tp != NULL; tp = tpn) {
                tpn = TAILQ_NEXT(tp, tte_link);
                if ((tp->tte_data & TD_PV) == 0)
                        continue;
                pm = TTE_GET_PMAP(tp);
                va = TTE_GET_VA(tp);
                PMAP_LOCK(pm);
                if ((tp->tte_data & TD_WIRED) != 0)
                        pm->pm_stats.wired_count--;
                if ((tp->tte_data & TD_REF) != 0)
                        vm_page_flag_set(m, PG_REFERENCED);
                if ((tp->tte_data & TD_W) != 0)
                        vm_page_dirty(m);
                tp->tte_data &= ~TD_V;
                tlb_page_demap(pm, va);
                TAILQ_REMOVE(&m->md.tte_list, tp, tte_link);
                pm->pm_stats.resident_count--;
                pmap_cache_remove(m, va);
                TTE_ZERO(tp);
                PMAP_UNLOCK(pm);
        }
        vm_page_flag_clear(m, PG_WRITEABLE);
}

int
pmap_protect_tte(struct pmap *pm, struct pmap *pm2, struct tte *tp,
                 vm_offset_t va)
{
        u_long data;
        vm_page_t m;

        data = atomic_clear_long(&tp->tte_data, TD_REF | TD_SW | TD_W);
        if ((data & TD_PV) != 0) {
                m = PHYS_TO_VM_PAGE(TD_PA(data));
                if ((data & TD_REF) != 0)
                        vm_page_flag_set(m, PG_REFERENCED);
                if ((data & TD_W) != 0)
                        vm_page_dirty(m);
        }
        return (1);
}

/*
 * Set the physical protection on the specified range of this map as requested.
 */
void
pmap_protect(pmap_t pm, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
{
        vm_offset_t va;
        struct tte *tp;

        CTR4(KTR_PMAP, "pmap_protect: ctx=%#lx sva=%#lx eva=%#lx prot=%#lx",
            pm->pm_context[curcpu], sva, eva, prot);

        if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
                pmap_remove(pm, sva, eva);
                return;
        }

        if (prot & VM_PROT_WRITE)
                return;

        vm_page_lock_queues();
        PMAP_LOCK(pm);
        if (eva - sva > PMAP_TSB_THRESH) {
                tsb_foreach(pm, NULL, sva, eva, pmap_protect_tte);
                tlb_context_demap(pm);
        } else {
                for (va = sva; va < eva; va += PAGE_SIZE) {
                        if ((tp = tsb_tte_lookup(pm, va)) != NULL)
                                pmap_protect_tte(pm, NULL, tp, va);
                }
                tlb_range_demap(pm, sva, eva - 1);
        }
        PMAP_UNLOCK(pm);
        vm_page_unlock_queues();
}

/*
 * Map the given physical page at the specified virtual address in the
 * target pmap with the protection requested.  If specified the page
 * will be wired down.
 */
void
pmap_enter(pmap_t pm, vm_offset_t va, vm_prot_t access, vm_page_t m,
    vm_prot_t prot, boolean_t wired)
{

        vm_page_lock_queues();
        PMAP_LOCK(pm);
        pmap_enter_locked(pm, va, m, prot, wired);
        vm_page_unlock_queues();
        PMAP_UNLOCK(pm);
}

/*
 * Map the given physical page at the specified virtual address in the
 * target pmap with the protection requested.  If specified the page
 * will be wired down.
 *
 * The page queues and pmap must be locked.
 */
static void
pmap_enter_locked(pmap_t pm, vm_offset_t va, vm_page_t m, vm_prot_t prot,
    boolean_t wired)
{
        struct tte *tp;
        vm_paddr_t pa;
        u_long data;
        int i;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        PMAP_LOCK_ASSERT(pm, MA_OWNED);
        PMAP_STATS_INC(pmap_nenter);
        pa = VM_PAGE_TO_PHYS(m);

        /*
         * If this is a fake page from the device_pager, but it covers actual
         * physical memory, convert to the real backing page.
         */
        if ((m->flags & PG_FICTITIOUS) != 0) {
                for (i = 0; phys_avail[i + 1] != 0; i += 2) {
                        if (pa >= phys_avail[i] && pa <= phys_avail[i + 1]) {
                                m = PHYS_TO_VM_PAGE(pa);
                                break;
                        }
                }
        }

        CTR6(KTR_PMAP,
            "pmap_enter_locked: ctx=%p m=%p va=%#lx pa=%#lx prot=%#x wired=%d",
            pm->pm_context[curcpu], m, va, pa, prot, wired);

        /*
         * If there is an existing mapping, and the physical address has not
         * changed, must be protection or wiring change.
         */
        if ((tp = tsb_tte_lookup(pm, va)) != NULL && TTE_GET_PA(tp) == pa) {
                CTR0(KTR_PMAP, "pmap_enter_locked: update");
                PMAP_STATS_INC(pmap_nenter_update);

                /*
                 * Wiring change, just update stats.
                 */
                if (wired) {
                        if ((tp->tte_data & TD_WIRED) == 0) {
                                tp->tte_data |= TD_WIRED;
                                pm->pm_stats.wired_count++;
                        }
                } else {
                        if ((tp->tte_data & TD_WIRED) != 0) {
                                tp->tte_data &= ~TD_WIRED;
                                pm->pm_stats.wired_count--;
                        }
                }

                /*
                 * Save the old bits and clear the ones we're interested in.
                 */
                data = tp->tte_data;
                tp->tte_data &= ~(TD_EXEC | TD_SW | TD_W);

                /*
                 * If we're turning off write permissions, sense modify status.
                 */
                if ((prot & VM_PROT_WRITE) != 0) {
                        tp->tte_data |= TD_SW;
                        if (wired) {
                                tp->tte_data |= TD_W;
                        }
                        vm_page_flag_set(m, PG_WRITEABLE);
                } else if ((data & TD_W) != 0) {
                        vm_page_dirty(m);
                }

                /*
                 * If we're turning on execute permissions, flush the icache.
                 */
                if ((prot & VM_PROT_EXECUTE) != 0) {
                        if ((data & TD_EXEC) == 0) {
                                icache_page_inval(pa);
                        }
                        tp->tte_data |= TD_EXEC;
                }

                /*
                 * Delete the old mapping.
                 */
                tlb_page_demap(pm, TTE_GET_VA(tp));
        } else {
                /*
                 * If there is an existing mapping, but its for a different
                 * phsyical address, delete the old mapping.
                 */
                if (tp != NULL) {
                        CTR0(KTR_PMAP, "pmap_enter_locked: replace");
                        PMAP_STATS_INC(pmap_nenter_replace);
                        pmap_remove_tte(pm, NULL, tp, va);
                        tlb_page_demap(pm, va);
                } else {
                        CTR0(KTR_PMAP, "pmap_enter_locked: new");
                        PMAP_STATS_INC(pmap_nenter_new);
                }

                /*
                 * Now set up the data and install the new mapping.
                 */
                data = TD_V | TD_8K | TD_PA(pa);
                if (pm == kernel_pmap)
                        data |= TD_P;
                if ((prot & VM_PROT_WRITE) != 0) {
                        data |= TD_SW;
                        vm_page_flag_set(m, PG_WRITEABLE);
                }
                if (prot & VM_PROT_EXECUTE) {
                        data |= TD_EXEC;
                        icache_page_inval(pa);
                }

                /*
                 * If its wired update stats.  We also don't need reference or
                 * modify tracking for wired mappings, so set the bits now.
                 */
                if (wired) {
                        pm->pm_stats.wired_count++;
                        data |= TD_REF | TD_WIRED;
                        if ((prot & VM_PROT_WRITE) != 0)
                                data |= TD_W;
                }

                tsb_tte_enter(pm, m, va, TS_8K, data);
        }
}

/*
 * Maps a sequence of resident pages belonging to the same object.
 * The sequence begins with the given page m_start.  This page is
 * mapped at the given virtual address start.  Each subsequent page is
 * mapped at a virtual address that is offset from start by the same
 * amount as the page is offset from m_start within the object.  The
 * last page in the sequence is the page with the largest offset from
 * m_start that can be mapped at a virtual address less than the given
 * virtual address end.  Not every virtual page between start and end
 * is mapped; only those for which a resident page exists with the
 * corresponding offset from m_start are mapped.
 */
void
pmap_enter_object(pmap_t pm, vm_offset_t start, vm_offset_t end,
    vm_page_t m_start, vm_prot_t prot)
{
        vm_page_t m;
        vm_pindex_t diff, psize;

        psize = atop(end - start);
        m = m_start;
        PMAP_LOCK(pm);
        while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
                pmap_enter_locked(pm, start + ptoa(diff), m, prot &
                    (VM_PROT_READ | VM_PROT_EXECUTE), FALSE);
                m = TAILQ_NEXT(m, listq);
        }
        PMAP_UNLOCK(pm);
}

void
pmap_enter_quick(pmap_t pm, vm_offset_t va, vm_page_t m, vm_prot_t prot)
{

        PMAP_LOCK(pm);
        pmap_enter_locked(pm, va, m, prot & (VM_PROT_READ | VM_PROT_EXECUTE),
            FALSE);
        PMAP_UNLOCK(pm);
}

void
pmap_object_init_pt(pmap_t pm, vm_offset_t addr, vm_object_t object,
                    vm_pindex_t pindex, vm_size_t size)
{

        VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
        KASSERT(object->type == OBJT_DEVICE || object->type == OBJT_SG,
            ("pmap_object_init_pt: non-device object"));
}

/*
 * Change the wiring attribute for a map/virtual-address pair.
 * The mapping must already exist in the pmap.
 */
void
pmap_change_wiring(pmap_t pm, vm_offset_t va, boolean_t wired)
{
        struct tte *tp;
        u_long data;

        PMAP_LOCK(pm);
        if ((tp = tsb_tte_lookup(pm, va)) != NULL) {
                if (wired) {
                        data = atomic_set_long(&tp->tte_data, TD_WIRED);
                        if ((data & TD_WIRED) == 0)
                                pm->pm_stats.wired_count++;
                } else {
                        data = atomic_clear_long(&tp->tte_data, TD_WIRED);
                        if ((data & TD_WIRED) != 0)
                                pm->pm_stats.wired_count--;
                }
        }
        PMAP_UNLOCK(pm);
}

static int
pmap_copy_tte(pmap_t src_pmap, pmap_t dst_pmap, struct tte *tp, vm_offset_t va)
{
        vm_page_t m;
        u_long data;

        if ((tp->tte_data & TD_FAKE) != 0)
                return (1);
        if (tsb_tte_lookup(dst_pmap, va) == NULL) {
                data = tp->tte_data &
                    ~(TD_PV | TD_REF | TD_SW | TD_CV | TD_W);
                m = PHYS_TO_VM_PAGE(TTE_GET_PA(tp));
                tsb_tte_enter(dst_pmap, m, va, TS_8K, data);
        }
        return (1);
}

void
pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr,
          vm_size_t len, vm_offset_t src_addr)
{
        struct tte *tp;
        vm_offset_t va;

        if (dst_addr != src_addr)
                return;
        vm_page_lock_queues();
        if (dst_pmap < src_pmap) {
                PMAP_LOCK(dst_pmap);
                PMAP_LOCK(src_pmap);
        } else {
                PMAP_LOCK(src_pmap);
                PMAP_LOCK(dst_pmap);
        }
        if (len > PMAP_TSB_THRESH) {
                tsb_foreach(src_pmap, dst_pmap, src_addr, src_addr + len,
                    pmap_copy_tte);
                tlb_context_demap(dst_pmap);
        } else {
                for (va = src_addr; va < src_addr + len; va += PAGE_SIZE) {
                        if ((tp = tsb_tte_lookup(src_pmap, va)) != NULL)
                                pmap_copy_tte(src_pmap, dst_pmap, tp, va);
                }
                tlb_range_demap(dst_pmap, src_addr, src_addr + len - 1);
        }
        vm_page_unlock_queues();
        PMAP_UNLOCK(src_pmap);
        PMAP_UNLOCK(dst_pmap);
}

void
pmap_zero_page(vm_page_t m)
{
        struct tte *tp;
        vm_offset_t va;
        vm_paddr_t pa;

        KASSERT((m->flags & PG_FICTITIOUS) == 0,
            ("pmap_zero_page: fake page"));
        PMAP_STATS_INC(pmap_nzero_page);
        pa = VM_PAGE_TO_PHYS(m);
        if (m->md.color == -1) {
                PMAP_STATS_INC(pmap_nzero_page_nc);
                aszero(ASI_PHYS_USE_EC, pa, PAGE_SIZE);
        } else if (m->md.color == DCACHE_COLOR(pa)) {
                PMAP_STATS_INC(pmap_nzero_page_c);
                va = TLB_PHYS_TO_DIRECT(pa);
                cpu_block_zero((void *)va, PAGE_SIZE);
        } else {
                PMAP_STATS_INC(pmap_nzero_page_oc);
                PMAP_LOCK(kernel_pmap);
                va = pmap_temp_map_1 + (m->md.color * PAGE_SIZE);
                tp = tsb_kvtotte(va);
                tp->tte_data = TD_V | TD_8K | TD_PA(pa) | TD_CP | TD_CV | TD_W;
                tp->tte_vpn = TV_VPN(va, TS_8K);
                cpu_block_zero((void *)va, PAGE_SIZE);
                tlb_page_demap(kernel_pmap, va);
                PMAP_UNLOCK(kernel_pmap);
        }
}

void
pmap_zero_page_area(vm_page_t m, int off, int size)
{
        struct tte *tp;
        vm_offset_t va;
        vm_paddr_t pa;

        KASSERT((m->flags & PG_FICTITIOUS) == 0,
            ("pmap_zero_page_area: fake page"));
        KASSERT(off + size <= PAGE_SIZE, ("pmap_zero_page_area: bad off/size"));
        PMAP_STATS_INC(pmap_nzero_page_area);
        pa = VM_PAGE_TO_PHYS(m);
        if (m->md.color == -1) {
                PMAP_STATS_INC(pmap_nzero_page_area_nc);
                aszero(ASI_PHYS_USE_EC, pa + off, size);
        } else if (m->md.color == DCACHE_COLOR(pa)) {
                PMAP_STATS_INC(pmap_nzero_page_area_c);
                va = TLB_PHYS_TO_DIRECT(pa);
                bzero((void *)(va + off), size);
        } else {
                PMAP_STATS_INC(pmap_nzero_page_area_oc);
                PMAP_LOCK(kernel_pmap);
                va = pmap_temp_map_1 + (m->md.color * PAGE_SIZE);
                tp = tsb_kvtotte(va);
                tp->tte_data = TD_V | TD_8K | TD_PA(pa) | TD_CP | TD_CV | TD_W;
                tp->tte_vpn = TV_VPN(va, TS_8K);
                bzero((void *)(va + off), size);
                tlb_page_demap(kernel_pmap, va);
                PMAP_UNLOCK(kernel_pmap);
        }
}

void
pmap_zero_page_idle(vm_page_t m)
{
        struct tte *tp;
        vm_offset_t va;
        vm_paddr_t pa;

        KASSERT((m->flags & PG_FICTITIOUS) == 0,
            ("pmap_zero_page_idle: fake page"));
        PMAP_STATS_INC(pmap_nzero_page_idle);
        pa = VM_PAGE_TO_PHYS(m);
        if (m->md.color == -1) {
                PMAP_STATS_INC(pmap_nzero_page_idle_nc);
                aszero(ASI_PHYS_USE_EC, pa, PAGE_SIZE);
        } else if (m->md.color == DCACHE_COLOR(pa)) {
                PMAP_STATS_INC(pmap_nzero_page_idle_c);
                va = TLB_PHYS_TO_DIRECT(pa);
                cpu_block_zero((void *)va, PAGE_SIZE);
        } else {
                PMAP_STATS_INC(pmap_nzero_page_idle_oc);
                va = pmap_idle_map + (m->md.color * PAGE_SIZE);
                tp = tsb_kvtotte(va);
                tp->tte_data = TD_V | TD_8K | TD_PA(pa) | TD_CP | TD_CV | TD_W;
                tp->tte_vpn = TV_VPN(va, TS_8K);
                cpu_block_zero((void *)va, PAGE_SIZE);
                tlb_page_demap(kernel_pmap, va);
        }
}

void
pmap_copy_page(vm_page_t msrc, vm_page_t mdst)
{
        vm_offset_t vdst;
        vm_offset_t vsrc;
        vm_paddr_t pdst;
        vm_paddr_t psrc;
        struct tte *tp;

        KASSERT((mdst->flags & PG_FICTITIOUS) == 0,
            ("pmap_copy_page: fake dst page"));
        KASSERT((msrc->flags & PG_FICTITIOUS) == 0,
            ("pmap_copy_page: fake src page"));
        PMAP_STATS_INC(pmap_ncopy_page);
        pdst = VM_PAGE_TO_PHYS(mdst);
        psrc = VM_PAGE_TO_PHYS(msrc);
        if (msrc->md.color == -1 && mdst->md.color == -1) {
                PMAP_STATS_INC(pmap_ncopy_page_nc);
                ascopy(ASI_PHYS_USE_EC, psrc, pdst, PAGE_SIZE);
        } else if (msrc->md.color == DCACHE_COLOR(psrc) &&
            mdst->md.color == DCACHE_COLOR(pdst)) {
                PMAP_STATS_INC(pmap_ncopy_page_c);
                vdst = TLB_PHYS_TO_DIRECT(pdst);
                vsrc = TLB_PHYS_TO_DIRECT(psrc);
                cpu_block_copy((void *)vsrc, (void *)vdst, PAGE_SIZE);
        } else if (msrc->md.color == -1) {
                if (mdst->md.color == DCACHE_COLOR(pdst)) {
                        PMAP_STATS_INC(pmap_ncopy_page_dc);
                        vdst = TLB_PHYS_TO_DIRECT(pdst);
                        ascopyfrom(ASI_PHYS_USE_EC, psrc, (void *)vdst,
                            PAGE_SIZE);
                } else {
                        PMAP_STATS_INC(pmap_ncopy_page_doc);
                        PMAP_LOCK(kernel_pmap);
                        vdst = pmap_temp_map_1 + (mdst->md.color * PAGE_SIZE);
                        tp = tsb_kvtotte(vdst);
                        tp->tte_data =
                            TD_V | TD_8K | TD_PA(pdst) | TD_CP | TD_CV | TD_W;
                        tp->tte_vpn = TV_VPN(vdst, TS_8K);
                        ascopyfrom(ASI_PHYS_USE_EC, psrc, (void *)vdst,
                            PAGE_SIZE);
                        tlb_page_demap(kernel_pmap, vdst);
                        PMAP_UNLOCK(kernel_pmap);
                }
        } else if (mdst->md.color == -1) {
                if (msrc->md.color == DCACHE_COLOR(psrc)) {
                        PMAP_STATS_INC(pmap_ncopy_page_sc);
                        vsrc = TLB_PHYS_TO_DIRECT(psrc);
                        ascopyto((void *)vsrc, ASI_PHYS_USE_EC, pdst,
                            PAGE_SIZE);
                } else {
                        PMAP_STATS_INC(pmap_ncopy_page_soc);
                        PMAP_LOCK(kernel_pmap);
                        vsrc = pmap_temp_map_1 + (msrc->md.color * PAGE_SIZE);
                        tp = tsb_kvtotte(vsrc);
                        tp->tte_data =
                            TD_V | TD_8K | TD_PA(psrc) | TD_CP | TD_CV | TD_W;
                        tp->tte_vpn = TV_VPN(vsrc, TS_8K);
                        ascopyto((void *)vsrc, ASI_PHYS_USE_EC, pdst,
                            PAGE_SIZE);
                        tlb_page_demap(kernel_pmap, vsrc);
                        PMAP_UNLOCK(kernel_pmap);
                }
        } else {
                PMAP_STATS_INC(pmap_ncopy_page_oc);
                PMAP_LOCK(kernel_pmap);
                vdst = pmap_temp_map_1 + (mdst->md.color * PAGE_SIZE);
                tp = tsb_kvtotte(vdst);
                tp->tte_data =
                    TD_V | TD_8K | TD_PA(pdst) | TD_CP | TD_CV | TD_W;
                tp->tte_vpn = TV_VPN(vdst, TS_8K);
                vsrc = pmap_temp_map_2 + (msrc->md.color * PAGE_SIZE);
                tp = tsb_kvtotte(vsrc);
                tp->tte_data =
                    TD_V | TD_8K | TD_PA(psrc) | TD_CP | TD_CV | TD_W;
                tp->tte_vpn = TV_VPN(vsrc, TS_8K);
                cpu_block_copy((void *)vsrc, (void *)vdst, PAGE_SIZE);
                tlb_page_demap(kernel_pmap, vdst);
                tlb_page_demap(kernel_pmap, vsrc);
                PMAP_UNLOCK(kernel_pmap);
        }
}

/*
 * Returns true if the pmap's pv is one of the first
 * 16 pvs linked to from this page.  This count may
 * be changed upwards or downwards in the future; it
 * is only necessary that true be returned for a small
 * subset of pmaps for proper page aging.
 */
boolean_t
pmap_page_exists_quick(pmap_t pm, vm_page_t m)
{
        struct tte *tp;
        int loops;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
                return (FALSE);
        loops = 0;
        TAILQ_FOREACH(tp, &m->md.tte_list, tte_link) {
                if ((tp->tte_data & TD_PV) == 0)
                        continue;
                if (TTE_GET_PMAP(tp) == pm)
                        return (TRUE);
                if (++loops >= 16)
                        break;
        }
        return (FALSE);
}

/*
 * Return the number of managed mappings to the given physical page
 * that are wired.
 */
int
pmap_page_wired_mappings(vm_page_t m)
{
        struct tte *tp;
        int count;

        count = 0;
        if ((m->flags & PG_FICTITIOUS) != 0)
                return (count);
        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        TAILQ_FOREACH(tp, &m->md.tte_list, tte_link)
                if ((tp->tte_data & (TD_PV | TD_WIRED)) == (TD_PV | TD_WIRED))
                        count++;
        return (count);
}

/*
 * Remove all pages from specified address space, this aids process exit
 * speeds.  This is much faster than pmap_remove n the case of running down
 * an entire address space.  Only works for the current pmap.
 */
void
pmap_remove_pages(pmap_t pm)
{

}

/*
 * Returns TRUE if the given page has a managed mapping.
 */
boolean_t
pmap_page_is_mapped(vm_page_t m)
{
        struct tte *tp;

        if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
                return (FALSE);
        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        TAILQ_FOREACH(tp, &m->md.tte_list, tte_link) {
                if ((tp->tte_data & TD_PV) != 0)
                        return (TRUE);
        }
        return (FALSE);
}

/*
 * Return a count of reference bits for a page, clearing those bits.
 * It is not necessary for every reference bit to be cleared, but it
 * is necessary that 0 only be returned when there are truly no
 * reference bits set.
 *
 * XXX: The exact number of bits to check and clear is a matter that
 * should be tested and standardized at some point in the future for
 * optimal aging of shared pages.
 */
int
pmap_ts_referenced(vm_page_t m)
{
        struct tte *tpf;
        struct tte *tpn;
        struct tte *tp;
        u_long data;
        int count;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
                return (0);
        count = 0;
        if ((tp = TAILQ_FIRST(&m->md.tte_list)) != NULL) {
                tpf = tp;
                do {
                        tpn = TAILQ_NEXT(tp, tte_link);
                        TAILQ_REMOVE(&m->md.tte_list, tp, tte_link);
                        TAILQ_INSERT_TAIL(&m->md.tte_list, tp, tte_link);
                        if ((tp->tte_data & TD_PV) == 0)
                                continue;
                        data = atomic_clear_long(&tp->tte_data, TD_REF);
                        if ((data & TD_REF) != 0 && ++count > 4)
                                break;
                } while ((tp = tpn) != NULL && tp != tpf);
        }
        return (count);
}

boolean_t
pmap_is_modified(vm_page_t m)
{
        struct tte *tp;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
                return (FALSE);
        TAILQ_FOREACH(tp, &m->md.tte_list, tte_link) {
                if ((tp->tte_data & TD_PV) == 0)
                        continue;
                if ((tp->tte_data & TD_W) != 0)
                        return (TRUE);
        }
        return (FALSE);
}

/*
 *      pmap_is_prefaultable:
 *
 *      Return whether or not the specified virtual address is elgible
 *      for prefault.
 */
boolean_t
pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr)
{

        return (FALSE);
}

void
pmap_clear_modify(vm_page_t m)
{
        struct tte *tp;
        u_long data;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
                return;
        TAILQ_FOREACH(tp, &m->md.tte_list, tte_link) {
                if ((tp->tte_data & TD_PV) == 0)
                        continue;
                data = atomic_clear_long(&tp->tte_data, TD_W);
                if ((data & TD_W) != 0)
                        tlb_page_demap(TTE_GET_PMAP(tp), TTE_GET_VA(tp));
        }
}

void
pmap_clear_reference(vm_page_t m)
{
        struct tte *tp;
        u_long data;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
                return;
        TAILQ_FOREACH(tp, &m->md.tte_list, tte_link) {
                if ((tp->tte_data & TD_PV) == 0)
                        continue;
                data = atomic_clear_long(&tp->tte_data, TD_REF);
                if ((data & TD_REF) != 0)
                        tlb_page_demap(TTE_GET_PMAP(tp), TTE_GET_VA(tp));
        }
}

void
pmap_remove_write(vm_page_t m)
{
        struct tte *tp;
        u_long data;

        mtx_assert(&vm_page_queue_mtx, MA_OWNED);
        if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0 ||
            (m->flags & PG_WRITEABLE) == 0)
                return;
        TAILQ_FOREACH(tp, &m->md.tte_list, tte_link) {
                if ((tp->tte_data & TD_PV) == 0)
                        continue;
                data = atomic_clear_long(&tp->tte_data, TD_SW | TD_W);
                if ((data & TD_W) != 0) {
                        vm_page_dirty(m);
                        tlb_page_demap(TTE_GET_PMAP(tp), TTE_GET_VA(tp));
                }
        }
        vm_page_flag_clear(m, PG_WRITEABLE);
}

int
pmap_mincore(pmap_t pm, vm_offset_t addr)
{

        /* TODO; */
        return (0);
}

/*
 * Activate a user pmap.  The pmap must be activated before its address space
 * can be accessed in any way.
 */
void
pmap_activate(struct thread *td)
{
        struct vmspace *vm;
        struct pmap *pm;
        int context;

        vm = td->td_proc->p_vmspace;
        pm = vmspace_pmap(vm);

        mtx_lock_spin(&sched_lock);

        context = PCPU_GET(tlb_ctx);
        if (context == PCPU_GET(tlb_ctx_max)) {
                tlb_flush_user();
                context = PCPU_GET(tlb_ctx_min);
        }
        PCPU_SET(tlb_ctx, context + 1);

        pm->pm_context[curcpu] = context;
        pm->pm_active |= PCPU_GET(cpumask);
        PCPU_SET(pmap, pm);

        stxa(AA_DMMU_TSB, ASI_DMMU, pm->pm_tsb);
        stxa(AA_IMMU_TSB, ASI_IMMU, pm->pm_tsb);
        stxa(AA_DMMU_PCXR, ASI_DMMU, (ldxa(AA_DMMU_PCXR, ASI_DMMU) &
            TLB_PCXR_PGSZ_MASK) | context);
        flush(KERNBASE);

        mtx_unlock_spin(&sched_lock);
}

/*
 * Increase the starting virtual address of the given mapping if a
 * different alignment might result in more superpage mappings.
 */
void
pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
    vm_offset_t *addr, vm_size_t size)
{

}