MFH

[FreeBSD/FreeBSD.git] / sys / arm / arm / machdep.c

/*      $NetBSD: arm32_machdep.c,v 1.44 2004/03/24 15:34:47 atatat Exp $        */

/*-
 * Copyright (c) 2004 Olivier Houchard
 * Copyright (c) 1994-1998 Mark Brinicombe.
 * Copyright (c) 1994 Brini.
 * All rights reserved.
 *
 * This code is derived from software written for Brini by Mark Brinicombe
 *
 * 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 Mark Brinicombe
 *      for the NetBSD Project.
 * 4. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 * Machine dependant functions for kernel setup
 *
 * Created      : 17/09/94
 * Updated      : 18/04/01 updated for new wscons
 */

#include "opt_compat.h"
#include "opt_ddb.h"
#include "opt_kstack_pages.h"
#include "opt_platform.h"
#include "opt_sched.h"
#include "opt_timer.h"

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

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/bus.h>
#include <sys/cons.h>
#include <sys/cpu.h>
#include <sys/ctype.h>
#include <sys/efi.h>
#include <sys/exec.h>
#include <sys/imgact.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/msgbuf.h>
#include <sys/mutex.h>
#include <sys/pcpu.h>
#include <sys/ptrace.h>
#include <sys/reboot.h>
#include <sys/boot.h>
#include <sys/rwlock.h>
#include <sys/sched.h>
#include <sys/signalvar.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/uio.h>
#include <sys/vdso.h>

#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>

#include <machine/acle-compat.h>
#include <machine/armreg.h>
#include <machine/atags.h>
#include <machine/cpu.h>
#include <machine/cpuinfo.h>
#include <machine/debug_monitor.h>
#include <machine/db_machdep.h>
#include <machine/devmap.h>
#include <machine/frame.h>
#include <machine/intr.h>
#include <machine/machdep.h>
#include <machine/md_var.h>
#include <machine/metadata.h>
#include <machine/pcb.h>
#include <machine/physmem.h>
#include <machine/platform.h>
#include <machine/reg.h>
#include <machine/trap.h>
#include <machine/undefined.h>
#include <machine/vfp.h>
#include <machine/vmparam.h>
#include <machine/sysarch.h>

#ifdef FDT
#include <contrib/libfdt/libfdt.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#endif

#ifdef DDB
#include <ddb/ddb.h>

#if __ARM_ARCH >= 6

DB_SHOW_COMMAND(cp15, db_show_cp15)
{
        u_int reg;

        reg = cp15_midr_get();
        db_printf("Cpu ID: 0x%08x\n", reg);
        reg = cp15_ctr_get();
        db_printf("Current Cache Lvl ID: 0x%08x\n",reg);

        reg = cp15_sctlr_get();
        db_printf("Ctrl: 0x%08x\n",reg);
        reg = cp15_actlr_get();
        db_printf("Aux Ctrl: 0x%08x\n",reg);

        reg = cp15_id_pfr0_get();
        db_printf("Processor Feat 0: 0x%08x\n", reg);
        reg = cp15_id_pfr1_get();
        db_printf("Processor Feat 1: 0x%08x\n", reg);
        reg = cp15_id_dfr0_get();
        db_printf("Debug Feat 0: 0x%08x\n", reg);
        reg = cp15_id_afr0_get();
        db_printf("Auxiliary Feat 0: 0x%08x\n", reg);
        reg = cp15_id_mmfr0_get();
        db_printf("Memory Model Feat 0: 0x%08x\n", reg);
        reg = cp15_id_mmfr1_get();
        db_printf("Memory Model Feat 1: 0x%08x\n", reg);
        reg = cp15_id_mmfr2_get();
        db_printf("Memory Model Feat 2: 0x%08x\n", reg);
        reg = cp15_id_mmfr3_get();
        db_printf("Memory Model Feat 3: 0x%08x\n", reg);
        reg = cp15_ttbr_get();
        db_printf("TTB0: 0x%08x\n", reg);
}

DB_SHOW_COMMAND(vtop, db_show_vtop)
{
        u_int reg;

        if (have_addr) {
                cp15_ats1cpr_set(addr);
                reg = cp15_par_get();
                db_printf("Physical address reg: 0x%08x\n",reg);
        } else
                db_printf("show vtop <virt_addr>\n");
}
#endif /* __ARM_ARCH >= 6 */
#endif /* DDB */

#ifdef DEBUG
#define debugf(fmt, args...) printf(fmt, ##args)
#else
#define debugf(fmt, args...)
#endif

#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
    defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
    defined(COMPAT_FREEBSD9)
#error FreeBSD/arm doesn't provide compatibility with releases prior to 10
#endif

struct pcpu __pcpu[MAXCPU];
struct pcpu *pcpup = &__pcpu[0];

static struct trapframe proc0_tf;
uint32_t cpu_reset_address = 0;
int cold = 1;
vm_offset_t vector_page;

int (*_arm_memcpy)(void *, void *, int, int) = NULL;
int (*_arm_bzero)(void *, int, int) = NULL;
int _min_memcpy_size = 0;
int _min_bzero_size = 0;

extern int *end;

#ifdef FDT
static char *loader_envp;

vm_paddr_t pmap_pa;

#if __ARM_ARCH >= 6
vm_offset_t systempage;
vm_offset_t irqstack;
vm_offset_t undstack;
vm_offset_t abtstack;
#else
/*
 * This is the number of L2 page tables required for covering max
 * (hypothetical) memsize of 4GB and all kernel mappings (vectors, msgbuf,
 * stacks etc.), uprounded to be divisible by 4.
 */
#define KERNEL_PT_MAX   78

static struct pv_addr kernel_pt_table[KERNEL_PT_MAX];

struct pv_addr systempage;
static struct pv_addr msgbufpv;
struct pv_addr irqstack;
struct pv_addr undstack;
struct pv_addr abtstack;
static struct pv_addr kernelstack;
#endif
#endif

#if defined(LINUX_BOOT_ABI)
#define LBABI_MAX_BANKS 10

#define CMDLINE_GUARD "FreeBSD:"
uint32_t board_id;
struct arm_lbabi_tag *atag_list;
char linux_command_line[LBABI_MAX_COMMAND_LINE + 1];
char atags[LBABI_MAX_COMMAND_LINE * 2];
uint32_t memstart[LBABI_MAX_BANKS];
uint32_t memsize[LBABI_MAX_BANKS];
uint32_t membanks;
#endif

static uint32_t board_revision;
/* hex representation of uint64_t */
static char board_serial[32];

SYSCTL_NODE(_hw, OID_AUTO, board, CTLFLAG_RD, 0, "Board attributes");
SYSCTL_UINT(_hw_board, OID_AUTO, revision, CTLFLAG_RD,
    &board_revision, 0, "Board revision");
SYSCTL_STRING(_hw_board, OID_AUTO, serial, CTLFLAG_RD,
    board_serial, 0, "Board serial");

int vfp_exists;
SYSCTL_INT(_hw, HW_FLOATINGPT, floatingpoint, CTLFLAG_RD,
    &vfp_exists, 0, "Floating point support enabled");

void
board_set_serial(uint64_t serial)
{

        snprintf(board_serial, sizeof(board_serial)-1,
                    "%016jx", serial);
}

void
board_set_revision(uint32_t revision)
{

        board_revision = revision;
}

void
sendsig(catcher, ksi, mask)
        sig_t catcher;
        ksiginfo_t *ksi;
        sigset_t *mask;
{
        struct thread *td;
        struct proc *p;
        struct trapframe *tf;
        struct sigframe *fp, frame;
        struct sigacts *psp;
        struct sysentvec *sysent;
        int onstack;
        int sig;
        int code;

        td = curthread;
        p = td->td_proc;
        PROC_LOCK_ASSERT(p, MA_OWNED);
        sig = ksi->ksi_signo;
        code = ksi->ksi_code;
        psp = p->p_sigacts;
        mtx_assert(&psp->ps_mtx, MA_OWNED);
        tf = td->td_frame;
        onstack = sigonstack(tf->tf_usr_sp);

        CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
            catcher, sig);

        /* Allocate and validate space for the signal handler context. */
        if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
            SIGISMEMBER(psp->ps_sigonstack, sig)) {
                fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
                    td->td_sigstk.ss_size);
#if defined(COMPAT_43)
                td->td_sigstk.ss_flags |= SS_ONSTACK;
#endif
        } else
                fp = (struct sigframe *)td->td_frame->tf_usr_sp;

        /* make room on the stack */
        fp--;

        /* make the stack aligned */
        fp = (struct sigframe *)STACKALIGN(fp);
        /* Populate the siginfo frame. */
        get_mcontext(td, &frame.sf_uc.uc_mcontext, 0);
        frame.sf_si = ksi->ksi_info;
        frame.sf_uc.uc_sigmask = *mask;
        frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
            ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
        frame.sf_uc.uc_stack = td->td_sigstk;
        mtx_unlock(&psp->ps_mtx);
        PROC_UNLOCK(td->td_proc);

        /* Copy the sigframe out to the user's stack. */
        if (copyout(&frame, fp, sizeof(*fp)) != 0) {
                /* Process has trashed its stack. Kill it. */
                CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
                PROC_LOCK(p);
                sigexit(td, SIGILL);
        }

        /*
         * Build context to run handler in.  We invoke the handler
         * directly, only returning via the trampoline.  Note the
         * trampoline version numbers are coordinated with machine-
         * dependent code in libc.
         */

        tf->tf_r0 = sig;
        tf->tf_r1 = (register_t)&fp->sf_si;
        tf->tf_r2 = (register_t)&fp->sf_uc;

        /* the trampoline uses r5 as the uc address */
        tf->tf_r5 = (register_t)&fp->sf_uc;
        tf->tf_pc = (register_t)catcher;
        tf->tf_usr_sp = (register_t)fp;
        sysent = p->p_sysent;
        if (sysent->sv_sigcode_base != 0)
                tf->tf_usr_lr = (register_t)sysent->sv_sigcode_base;
        else
                tf->tf_usr_lr = (register_t)(sysent->sv_psstrings -
                    *(sysent->sv_szsigcode));
        /* Set the mode to enter in the signal handler */
#if __ARM_ARCH >= 7
        if ((register_t)catcher & 1)
                tf->tf_spsr |= PSR_T;
        else
                tf->tf_spsr &= ~PSR_T;
#endif

        CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_usr_lr,
            tf->tf_usr_sp);

        PROC_LOCK(p);
        mtx_lock(&psp->ps_mtx);
}

struct kva_md_info kmi;

/*
 * arm32_vector_init:
 *
 *      Initialize the vector page, and select whether or not to
 *      relocate the vectors.
 *
 *      NOTE: We expect the vector page to be mapped at its expected
 *      destination.
 */

extern unsigned int page0[], page0_data[];
void
arm_vector_init(vm_offset_t va, int which)
{
        unsigned int *vectors = (int *) va;
        unsigned int *vectors_data = vectors + (page0_data - page0);
        int vec;

        /*
         * Loop through the vectors we're taking over, and copy the
         * vector's insn and data word.
         */
        for (vec = 0; vec < ARM_NVEC; vec++) {
                if ((which & (1 << vec)) == 0) {
                        /* Don't want to take over this vector. */
                        continue;
                }
                vectors[vec] = page0[vec];
                vectors_data[vec] = page0_data[vec];
        }

        /* Now sync the vectors. */
        icache_sync(va, (ARM_NVEC * 2) * sizeof(u_int));

        vector_page = va;

        if (va == ARM_VECTORS_HIGH) {
                /*
                 * Assume the MD caller knows what it's doing here, and
                 * really does want the vector page relocated.
                 *
                 * Note: This has to be done here (and not just in
                 * cpu_setup()) because the vector page needs to be
                 * accessible *before* cpu_startup() is called.
                 * Think ddb(9) ...
                 *
                 * NOTE: If the CPU control register is not readable,
                 * this will totally fail!  We'll just assume that
                 * any system that has high vector support has a
                 * readable CPU control register, for now.  If we
                 * ever encounter one that does not, we'll have to
                 * rethink this.
                 */
                cpu_control(CPU_CONTROL_VECRELOC, CPU_CONTROL_VECRELOC);
        }
}

static void
cpu_startup(void *dummy)
{
        struct pcb *pcb = thread0.td_pcb;
        const unsigned int mbyte = 1024 * 1024;
#if __ARM_ARCH < 6 && !defined(ARM_CACHE_LOCK_ENABLE)
        vm_page_t m;
#endif

        identify_arm_cpu();

        vm_ksubmap_init(&kmi);

        /*
         * Display the RAM layout.
         */
        printf("real memory  = %ju (%ju MB)\n",
            (uintmax_t)arm32_ptob(realmem),
            (uintmax_t)arm32_ptob(realmem) / mbyte);
        printf("avail memory = %ju (%ju MB)\n",
            (uintmax_t)arm32_ptob(vm_cnt.v_free_count),
            (uintmax_t)arm32_ptob(vm_cnt.v_free_count) / mbyte);
        if (bootverbose) {
                arm_physmem_print_tables();
                arm_devmap_print_table();
        }

        bufinit();
        vm_pager_bufferinit();
        pcb->pcb_regs.sf_sp = (u_int)thread0.td_kstack +
            USPACE_SVC_STACK_TOP;
        pmap_set_pcb_pagedir(kernel_pmap, pcb);
#if __ARM_ARCH < 6
        vector_page_setprot(VM_PROT_READ);
        pmap_postinit();
#ifdef ARM_CACHE_LOCK_ENABLE
        pmap_kenter_user(ARM_TP_ADDRESS, ARM_TP_ADDRESS);
        arm_lock_cache_line(ARM_TP_ADDRESS);
#else
        m = vm_page_alloc(NULL, 0, VM_ALLOC_NOOBJ | VM_ALLOC_ZERO);
        pmap_kenter_user(ARM_TP_ADDRESS, VM_PAGE_TO_PHYS(m));
#endif
        *(uint32_t *)ARM_RAS_START = 0;
        *(uint32_t *)ARM_RAS_END = 0xffffffff;
#endif
}

SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);

/*
 * Flush the D-cache for non-DMA I/O so that the I-cache can
 * be made coherent later.
 */
void
cpu_flush_dcache(void *ptr, size_t len)
{

        dcache_wb_poc((vm_offset_t)ptr, (vm_paddr_t)vtophys(ptr), len);
}

/* Get current clock frequency for the given cpu id. */
int
cpu_est_clockrate(int cpu_id, uint64_t *rate)
{

        return (ENXIO);
}

void
cpu_idle(int busy)
{

        CTR2(KTR_SPARE2, "cpu_idle(%d) at %d", busy, curcpu);
        spinlock_enter();
#ifndef NO_EVENTTIMERS
        if (!busy)
                cpu_idleclock();
#endif
        if (!sched_runnable())
                cpu_sleep(0);
#ifndef NO_EVENTTIMERS
        if (!busy)
                cpu_activeclock();
#endif
        spinlock_exit();
        CTR2(KTR_SPARE2, "cpu_idle(%d) at %d done", busy, curcpu);
}

int
cpu_idle_wakeup(int cpu)
{

        return (0);
}

/*
 * Most ARM platforms don't need to do anything special to init their clocks
 * (they get intialized during normal device attachment), and by not defining a
 * cpu_initclocks() function they get this generic one.  Any platform that needs
 * to do something special can just provide their own implementation, which will
 * override this one due to the weak linkage.
 */
void
arm_generic_initclocks(void)
{

#ifndef NO_EVENTTIMERS
#ifdef SMP
        if (PCPU_GET(cpuid) == 0)
                cpu_initclocks_bsp();
        else
                cpu_initclocks_ap();
#else
        cpu_initclocks_bsp();
#endif
#endif
}
__weak_reference(arm_generic_initclocks, cpu_initclocks);

int
fill_regs(struct thread *td, struct reg *regs)
{
        struct trapframe *tf = td->td_frame;
        bcopy(&tf->tf_r0, regs->r, sizeof(regs->r));
        regs->r_sp = tf->tf_usr_sp;
        regs->r_lr = tf->tf_usr_lr;
        regs->r_pc = tf->tf_pc;
        regs->r_cpsr = tf->tf_spsr;
        return (0);
}
int
fill_fpregs(struct thread *td, struct fpreg *regs)
{
        bzero(regs, sizeof(*regs));
        return (0);
}

int
set_regs(struct thread *td, struct reg *regs)
{
        struct trapframe *tf = td->td_frame;

        bcopy(regs->r, &tf->tf_r0, sizeof(regs->r));
        tf->tf_usr_sp = regs->r_sp;
        tf->tf_usr_lr = regs->r_lr;
        tf->tf_pc = regs->r_pc;
        tf->tf_spsr &=  ~PSR_FLAGS;
        tf->tf_spsr |= regs->r_cpsr & PSR_FLAGS;
        return (0);
}

int
set_fpregs(struct thread *td, struct fpreg *regs)
{
        return (0);
}

int
fill_dbregs(struct thread *td, struct dbreg *regs)
{
        return (0);
}
int
set_dbregs(struct thread *td, struct dbreg *regs)
{
        return (0);
}


static int
ptrace_read_int(struct thread *td, vm_offset_t addr, uint32_t *v)
{

        if (proc_readmem(td, td->td_proc, addr, v, sizeof(*v)) != sizeof(*v))
                return (ENOMEM);
        return (0);
}

static int
ptrace_write_int(struct thread *td, vm_offset_t addr, uint32_t v)
{

        if (proc_writemem(td, td->td_proc, addr, &v, sizeof(v)) != sizeof(v))
                return (ENOMEM);
        return (0);
}

static u_int
ptrace_get_usr_reg(void *cookie, int reg)
{
        int ret;
        struct thread *td = cookie;

        KASSERT(((reg >= 0) && (reg <= ARM_REG_NUM_PC)),
         ("reg is outside range"));

        switch(reg) {
        case ARM_REG_NUM_PC:
                ret = td->td_frame->tf_pc;
                break;
        case ARM_REG_NUM_LR:
                ret = td->td_frame->tf_usr_lr;
                break;
        case ARM_REG_NUM_SP:
                ret = td->td_frame->tf_usr_sp;
                break;
        default:
                ret = *((register_t*)&td->td_frame->tf_r0 + reg);
                break;
        }

        return (ret);
}

static u_int
ptrace_get_usr_int(void* cookie, vm_offset_t offset, u_int* val)
{
        struct thread *td = cookie;
        u_int error;

        error = ptrace_read_int(td, offset, val);

        return (error);
}

/**
 * This function parses current instruction opcode and decodes
 * any possible jump (change in PC) which might occur after
 * the instruction is executed.
 *
 * @param     td                Thread structure of analysed task
 * @param     cur_instr         Currently executed instruction
 * @param     alt_next_address  Pointer to the variable where
 *                              the destination address of the
 *                              jump instruction shall be stored.
 *
 * @return    <0>               when jump is possible
 *            <EINVAL>          otherwise
 */
static int
ptrace_get_alternative_next(struct thread *td, uint32_t cur_instr,
    uint32_t *alt_next_address)
{
        int error;

        if (inst_branch(cur_instr) || inst_call(cur_instr) ||
            inst_return(cur_instr)) {
                error = arm_predict_branch(td, cur_instr, td->td_frame->tf_pc,
                    alt_next_address, ptrace_get_usr_reg, ptrace_get_usr_int);

                return (error);
        }

        return (EINVAL);
}

int
ptrace_single_step(struct thread *td)
{
        struct proc *p;
        int error, error_alt;
        uint32_t cur_instr, alt_next = 0;

        /* TODO: This needs to be updated for Thumb-2 */
        if ((td->td_frame->tf_spsr & PSR_T) != 0)
                return (EINVAL);

        KASSERT(td->td_md.md_ptrace_instr == 0,
         ("Didn't clear single step"));
        KASSERT(td->td_md.md_ptrace_instr_alt == 0,
         ("Didn't clear alternative single step"));
        p = td->td_proc;
        PROC_UNLOCK(p);

        error = ptrace_read_int(td, td->td_frame->tf_pc,
            &cur_instr);
        if (error)
                goto out;

        error = ptrace_read_int(td, td->td_frame->tf_pc + INSN_SIZE,
            &td->td_md.md_ptrace_instr);
        if (error == 0) {
                error = ptrace_write_int(td, td->td_frame->tf_pc + INSN_SIZE,
                    PTRACE_BREAKPOINT);
                if (error) {
                        td->td_md.md_ptrace_instr = 0;
                } else {
                        td->td_md.md_ptrace_addr = td->td_frame->tf_pc +
                            INSN_SIZE;
                }
        }

        error_alt = ptrace_get_alternative_next(td, cur_instr, &alt_next);
        if (error_alt == 0) {
                error_alt = ptrace_read_int(td, alt_next,
                    &td->td_md.md_ptrace_instr_alt);
                if (error_alt) {
                        td->td_md.md_ptrace_instr_alt = 0;
                } else {
                        error_alt = ptrace_write_int(td, alt_next,
                            PTRACE_BREAKPOINT);
                        if (error_alt)
                                td->td_md.md_ptrace_instr_alt = 0;
                        else
                                td->td_md.md_ptrace_addr_alt = alt_next;
                }
        }

out:
        PROC_LOCK(p);
        return ((error != 0) && (error_alt != 0));
}

int
ptrace_clear_single_step(struct thread *td)
{
        struct proc *p;

        /* TODO: This needs to be updated for Thumb-2 */
        if ((td->td_frame->tf_spsr & PSR_T) != 0)
                return (EINVAL);

        if (td->td_md.md_ptrace_instr != 0) {
                p = td->td_proc;
                PROC_UNLOCK(p);
                ptrace_write_int(td, td->td_md.md_ptrace_addr,
                    td->td_md.md_ptrace_instr);
                PROC_LOCK(p);
                td->td_md.md_ptrace_instr = 0;
        }

        if (td->td_md.md_ptrace_instr_alt != 0) {
                p = td->td_proc;
                PROC_UNLOCK(p);
                ptrace_write_int(td, td->td_md.md_ptrace_addr_alt,
                    td->td_md.md_ptrace_instr_alt);
                PROC_LOCK(p);
                td->td_md.md_ptrace_instr_alt = 0;
        }

        return (0);
}

int
ptrace_set_pc(struct thread *td, unsigned long addr)
{
        td->td_frame->tf_pc = addr;
        return (0);
}

void
cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
{
}

void
spinlock_enter(void)
{
        struct thread *td;
        register_t cspr;

        td = curthread;
        if (td->td_md.md_spinlock_count == 0) {
                cspr = disable_interrupts(PSR_I | PSR_F);
                td->td_md.md_spinlock_count = 1;
                td->td_md.md_saved_cspr = cspr;
        } else
                td->td_md.md_spinlock_count++;
        critical_enter();
}

void
spinlock_exit(void)
{
        struct thread *td;
        register_t cspr;

        td = curthread;
        critical_exit();
        cspr = td->td_md.md_saved_cspr;
        td->td_md.md_spinlock_count--;
        if (td->td_md.md_spinlock_count == 0)
                restore_interrupts(cspr);
}

/*
 * Clear registers on exec
 */
void
exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
{
        struct trapframe *tf = td->td_frame;

        memset(tf, 0, sizeof(*tf));
        tf->tf_usr_sp = stack;
        tf->tf_usr_lr = imgp->entry_addr;
        tf->tf_svc_lr = 0x77777777;
        tf->tf_pc = imgp->entry_addr;
        tf->tf_spsr = PSR_USR32_MODE;
}

/*
 * Get machine context.
 */
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
{
        struct trapframe *tf = td->td_frame;
        __greg_t *gr = mcp->__gregs;

        if (clear_ret & GET_MC_CLEAR_RET) {
                gr[_REG_R0] = 0;
                gr[_REG_CPSR] = tf->tf_spsr & ~PSR_C;
        } else {
                gr[_REG_R0]   = tf->tf_r0;
                gr[_REG_CPSR] = tf->tf_spsr;
        }
        gr[_REG_R1]   = tf->tf_r1;
        gr[_REG_R2]   = tf->tf_r2;
        gr[_REG_R3]   = tf->tf_r3;
        gr[_REG_R4]   = tf->tf_r4;
        gr[_REG_R5]   = tf->tf_r5;
        gr[_REG_R6]   = tf->tf_r6;
        gr[_REG_R7]   = tf->tf_r7;
        gr[_REG_R8]   = tf->tf_r8;
        gr[_REG_R9]   = tf->tf_r9;
        gr[_REG_R10]  = tf->tf_r10;
        gr[_REG_R11]  = tf->tf_r11;
        gr[_REG_R12]  = tf->tf_r12;
        gr[_REG_SP]   = tf->tf_usr_sp;
        gr[_REG_LR]   = tf->tf_usr_lr;
        gr[_REG_PC]   = tf->tf_pc;

        return (0);
}

/*
 * Set machine context.
 *
 * However, we don't set any but the user modifiable flags, and we won't
 * touch the cs selector.
 */
int
set_mcontext(struct thread *td, mcontext_t *mcp)
{
        struct trapframe *tf = td->td_frame;
        const __greg_t *gr = mcp->__gregs;

        tf->tf_r0 = gr[_REG_R0];
        tf->tf_r1 = gr[_REG_R1];
        tf->tf_r2 = gr[_REG_R2];
        tf->tf_r3 = gr[_REG_R3];
        tf->tf_r4 = gr[_REG_R4];
        tf->tf_r5 = gr[_REG_R5];
        tf->tf_r6 = gr[_REG_R6];
        tf->tf_r7 = gr[_REG_R7];
        tf->tf_r8 = gr[_REG_R8];
        tf->tf_r9 = gr[_REG_R9];
        tf->tf_r10 = gr[_REG_R10];
        tf->tf_r11 = gr[_REG_R11];
        tf->tf_r12 = gr[_REG_R12];
        tf->tf_usr_sp = gr[_REG_SP];
        tf->tf_usr_lr = gr[_REG_LR];
        tf->tf_pc = gr[_REG_PC];
        tf->tf_spsr = gr[_REG_CPSR];

        return (0);
}

/*
 * MPSAFE
 */
int
sys_sigreturn(td, uap)
        struct thread *td;
        struct sigreturn_args /* {
                const struct __ucontext *sigcntxp;
        } */ *uap;
{
        ucontext_t uc;
        int spsr;

        if (uap == NULL)
                return (EFAULT);
        if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
                return (EFAULT);
        /*
         * Make sure the processor mode has not been tampered with and
         * interrupts have not been disabled.
         */
        spsr = uc.uc_mcontext.__gregs[_REG_CPSR];
        if ((spsr & PSR_MODE) != PSR_USR32_MODE ||
            (spsr & (PSR_I | PSR_F)) != 0)
                return (EINVAL);
                /* Restore register context. */
        set_mcontext(td, &uc.uc_mcontext);

        /* Restore signal mask. */
        kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);

        return (EJUSTRETURN);
}


/*
 * Construct a PCB from a trapframe. This is called from kdb_trap() where
 * we want to start a backtrace from the function that caused us to enter
 * the debugger. We have the context in the trapframe, but base the trace
 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
 * enough for a backtrace.
 */
void
makectx(struct trapframe *tf, struct pcb *pcb)
{
        pcb->pcb_regs.sf_r4 = tf->tf_r4;
        pcb->pcb_regs.sf_r5 = tf->tf_r5;
        pcb->pcb_regs.sf_r6 = tf->tf_r6;
        pcb->pcb_regs.sf_r7 = tf->tf_r7;
        pcb->pcb_regs.sf_r8 = tf->tf_r8;
        pcb->pcb_regs.sf_r9 = tf->tf_r9;
        pcb->pcb_regs.sf_r10 = tf->tf_r10;
        pcb->pcb_regs.sf_r11 = tf->tf_r11;
        pcb->pcb_regs.sf_r12 = tf->tf_r12;
        pcb->pcb_regs.sf_pc = tf->tf_pc;
        pcb->pcb_regs.sf_lr = tf->tf_usr_lr;
        pcb->pcb_regs.sf_sp = tf->tf_usr_sp;
}

/*
 * Fake up a boot descriptor table
 */
vm_offset_t
fake_preload_metadata(struct arm_boot_params *abp __unused, void *dtb_ptr,
    size_t dtb_size)
{
#ifdef DDB
        vm_offset_t zstart = 0, zend = 0;
#endif
        vm_offset_t lastaddr;
        int i = 0;
        static uint32_t fake_preload[35];

        fake_preload[i++] = MODINFO_NAME;
        fake_preload[i++] = strlen("kernel") + 1;
        strcpy((char*)&fake_preload[i++], "kernel");
        i += 1;
        fake_preload[i++] = MODINFO_TYPE;
        fake_preload[i++] = strlen("elf kernel") + 1;
        strcpy((char*)&fake_preload[i++], "elf kernel");
        i += 2;
        fake_preload[i++] = MODINFO_ADDR;
        fake_preload[i++] = sizeof(vm_offset_t);
        fake_preload[i++] = KERNVIRTADDR;
        fake_preload[i++] = MODINFO_SIZE;
        fake_preload[i++] = sizeof(uint32_t);
        fake_preload[i++] = (uint32_t)&end - KERNVIRTADDR;
#ifdef DDB
        if (*(uint32_t *)KERNVIRTADDR == MAGIC_TRAMP_NUMBER) {
                fake_preload[i++] = MODINFO_METADATA|MODINFOMD_SSYM;
                fake_preload[i++] = sizeof(vm_offset_t);
                fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 4);
                fake_preload[i++] = MODINFO_METADATA|MODINFOMD_ESYM;
                fake_preload[i++] = sizeof(vm_offset_t);
                fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 8);
                lastaddr = *(uint32_t *)(KERNVIRTADDR + 8);
                zend = lastaddr;
                zstart = *(uint32_t *)(KERNVIRTADDR + 4);
                db_fetch_ksymtab(zstart, zend);
        } else
#endif
                lastaddr = (vm_offset_t)&end;
        if (dtb_ptr != NULL) {
                /* Copy DTB to KVA space and insert it into module chain. */
                lastaddr = roundup(lastaddr, sizeof(int));
                fake_preload[i++] = MODINFO_METADATA | MODINFOMD_DTBP;
                fake_preload[i++] = sizeof(uint32_t);
                fake_preload[i++] = (uint32_t)lastaddr;
                memmove((void *)lastaddr, dtb_ptr, dtb_size);
                lastaddr += dtb_size;
                lastaddr = roundup(lastaddr, sizeof(int));
        }
        fake_preload[i++] = 0;
        fake_preload[i] = 0;
        preload_metadata = (void *)fake_preload;

        init_static_kenv(NULL, 0);

        return (lastaddr);
}

void
pcpu0_init(void)
{
#if __ARM_ARCH >= 6
        set_curthread(&thread0);
#endif
        pcpu_init(pcpup, 0, sizeof(struct pcpu));
        PCPU_SET(curthread, &thread0);
}

#if defined(LINUX_BOOT_ABI)

/* Convert the U-Boot command line into FreeBSD kenv and boot options. */
static void
cmdline_set_env(char *cmdline, const char *guard)
{
        char *cmdline_next, *env;
        size_t size, guard_len;
        int i;

        size = strlen(cmdline);
        /* Skip leading spaces. */
        for (; isspace(*cmdline) && (size > 0); cmdline++)
                size--;

        /* Test and remove guard. */
        if (guard != NULL && guard[0] != '\0') {
                guard_len  =  strlen(guard);
                if (strncasecmp(cmdline, guard, guard_len) != 0)
                        return;
                cmdline += guard_len;
                size -= guard_len;
        }

        /* Skip leading spaces. */
        for (; isspace(*cmdline) && (size > 0); cmdline++)
                size--;

        /* Replace ',' with '\0'. */
        /* TODO: implement escaping for ',' character. */
        cmdline_next = cmdline;
        while(strsep(&cmdline_next, ",") != NULL)
                ;
        init_static_kenv(cmdline, 0);
        /* Parse boothowto. */
        for (i = 0; howto_names[i].ev != NULL; i++) {
                env = kern_getenv(howto_names[i].ev);
                if (env != NULL) {
                        if (strtoul(env, NULL, 10) != 0)
                                boothowto |= howto_names[i].mask;
                        freeenv(env);
                }
        }
}

vm_offset_t
linux_parse_boot_param(struct arm_boot_params *abp)
{
        struct arm_lbabi_tag *walker;
        uint32_t revision;
        uint64_t serial;
        int size;
        vm_offset_t lastaddr;
#ifdef FDT
        struct fdt_header *dtb_ptr;
        uint32_t dtb_size;
#endif

        /*
         * Linux boot ABI: r0 = 0, r1 is the board type (!= 0) and r2
         * is atags or dtb pointer.  If all of these aren't satisfied,
         * then punt. Unfortunately, it looks like DT enabled kernels
         * doesn't uses board type and U-Boot delivers 0 in r1 for them.
         */
        if (abp->abp_r0 != 0 || abp->abp_r2 == 0)
                return (0);
#ifdef FDT
        /* Test if r2 point to valid DTB. */
        dtb_ptr = (struct fdt_header *)abp->abp_r2;
        if (fdt_check_header(dtb_ptr) == 0) {
                dtb_size = fdt_totalsize(dtb_ptr);
                return (fake_preload_metadata(abp, dtb_ptr, dtb_size));
        }
#endif

        board_id = abp->abp_r1;
        walker = (struct arm_lbabi_tag *)abp->abp_r2;

        if (ATAG_TAG(walker) != ATAG_CORE)
                return 0;

        atag_list = walker;
        while (ATAG_TAG(walker) != ATAG_NONE) {
                switch (ATAG_TAG(walker)) {
                case ATAG_CORE:
                        break;
                case ATAG_MEM:
                        arm_physmem_hardware_region(walker->u.tag_mem.start,
                            walker->u.tag_mem.size);
                        break;
                case ATAG_INITRD2:
                        break;
                case ATAG_SERIAL:
                        serial = walker->u.tag_sn.high;
                        serial <<= 32;
                        serial |= walker->u.tag_sn.low;
                        board_set_serial(serial);
                        break;
                case ATAG_REVISION:
                        revision = walker->u.tag_rev.rev;
                        board_set_revision(revision);
                        break;
                case ATAG_CMDLINE:
                        size = ATAG_SIZE(walker) -
                            sizeof(struct arm_lbabi_header);
                        size = min(size, LBABI_MAX_COMMAND_LINE);
                        strncpy(linux_command_line, walker->u.tag_cmd.command,
                            size);
                        linux_command_line[size] = '\0';
                        break;
                default:
                        break;
                }
                walker = ATAG_NEXT(walker);
        }

        /* Save a copy for later */
        bcopy(atag_list, atags,
            (char *)walker - (char *)atag_list + ATAG_SIZE(walker));

        lastaddr = fake_preload_metadata(abp, NULL, 0);
        cmdline_set_env(linux_command_line, CMDLINE_GUARD);
        return lastaddr;
}
#endif

#if defined(FREEBSD_BOOT_LOADER)
vm_offset_t
freebsd_parse_boot_param(struct arm_boot_params *abp)
{
        vm_offset_t lastaddr = 0;
        void *mdp;
        void *kmdp;
#ifdef DDB
        vm_offset_t ksym_start;
        vm_offset_t ksym_end;
#endif

        /*
         * Mask metadata pointer: it is supposed to be on page boundary. If
         * the first argument (mdp) doesn't point to a valid address the
         * bootloader must have passed us something else than the metadata
         * ptr, so we give up.  Also give up if we cannot find metadta section
         * the loader creates that we get all this data out of.
         */

        if ((mdp = (void *)(abp->abp_r0 & ~PAGE_MASK)) == NULL)
                return 0;
        preload_metadata = mdp;
        kmdp = preload_search_by_type("elf kernel");
        if (kmdp == NULL)
                return 0;

        boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
        loader_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
        init_static_kenv(loader_envp, 0);
        lastaddr = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t);
#ifdef DDB
        ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
        ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
        db_fetch_ksymtab(ksym_start, ksym_end);
#endif
        return lastaddr;
}
#endif

vm_offset_t
default_parse_boot_param(struct arm_boot_params *abp)
{
        vm_offset_t lastaddr;

#if defined(LINUX_BOOT_ABI)
        if ((lastaddr = linux_parse_boot_param(abp)) != 0)
                return lastaddr;
#endif
#if defined(FREEBSD_BOOT_LOADER)
        if ((lastaddr = freebsd_parse_boot_param(abp)) != 0)
                return lastaddr;
#endif
        /* Fall back to hardcoded metadata. */
        lastaddr = fake_preload_metadata(abp, NULL, 0);

        return lastaddr;
}

/*
 * Stub version of the boot parameter parsing routine.  We are
 * called early in initarm, before even VM has been initialized.
 * This routine needs to preserve any data that the boot loader
 * has passed in before the kernel starts to grow past the end
 * of the BSS, traditionally the place boot-loaders put this data.
 *
 * Since this is called so early, things that depend on the vm system
 * being setup (including access to some SoC's serial ports), about
 * all that can be done in this routine is to copy the arguments.
 *
 * This is the default boot parameter parsing routine.  Individual
 * kernels/boards can override this weak function with one of their
 * own.  We just fake metadata...
 */
__weak_reference(default_parse_boot_param, parse_boot_param);

/*
 * Initialize proc0
 */
void
init_proc0(vm_offset_t kstack)
{
        proc_linkup0(&proc0, &thread0);
        thread0.td_kstack = kstack;
        thread0.td_pcb = (struct pcb *)
                (thread0.td_kstack + kstack_pages * PAGE_SIZE) - 1;
        thread0.td_pcb->pcb_flags = 0;
        thread0.td_pcb->pcb_vfpcpu = -1;
        thread0.td_pcb->pcb_vfpstate.fpscr = VFPSCR_DN;
        thread0.td_frame = &proc0_tf;
        pcpup->pc_curpcb = thread0.td_pcb;
}

int
arm_predict_branch(void *cookie, u_int insn, register_t pc, register_t *new_pc,
    u_int (*fetch_reg)(void*, int), u_int (*read_int)(void*, vm_offset_t, u_int*))
{
        u_int addr, nregs, offset = 0;
        int error = 0;

        switch ((insn >> 24) & 0xf) {
        case 0x2:       /* add pc, reg1, #value */
        case 0x0:       /* add pc, reg1, reg2, lsl #offset */
                addr = fetch_reg(cookie, (insn >> 16) & 0xf);
                if (((insn >> 16) & 0xf) == 15)
                        addr += 8;
                if (insn & 0x0200000) {
                        offset = (insn >> 7) & 0x1e;
                        offset = (insn & 0xff) << (32 - offset) |
                            (insn & 0xff) >> offset;
                } else {

                        offset = fetch_reg(cookie, insn & 0x0f);
                        if ((insn & 0x0000ff0) != 0x00000000) {
                                if (insn & 0x10)
                                        nregs = fetch_reg(cookie,
                                            (insn >> 8) & 0xf);
                                else
                                        nregs = (insn >> 7) & 0x1f;
                                switch ((insn >> 5) & 3) {
                                case 0:
                                        /* lsl */
                                        offset = offset << nregs;
                                        break;
                                case 1:
                                        /* lsr */
                                        offset = offset >> nregs;
                                        break;
                                default:
                                        break; /* XXX */
                                }

                        }
                        *new_pc = addr + offset;
                        return (0);

                }

        case 0xa:       /* b ... */
        case 0xb:       /* bl ... */
                addr = ((insn << 2) & 0x03ffffff);
                if (addr & 0x02000000)
                        addr |= 0xfc000000;
                *new_pc = (pc + 8 + addr);
                return (0);
        case 0x7:       /* ldr pc, [pc, reg, lsl #2] */
                addr = fetch_reg(cookie, insn & 0xf);
                addr = pc + 8 + (addr << 2);
                error = read_int(cookie, addr, &addr);
                *new_pc = addr;
                return (error);
        case 0x1:       /* mov pc, reg */
                *new_pc = fetch_reg(cookie, insn & 0xf);
                return (0);
        case 0x4:
        case 0x5:       /* ldr pc, [reg] */
                addr = fetch_reg(cookie, (insn >> 16) & 0xf);
                /* ldr pc, [reg, #offset] */
                if (insn & (1 << 24))
                        offset = insn & 0xfff;
                if (insn & 0x00800000)
                        addr += offset;
                else
                        addr -= offset;
                error = read_int(cookie, addr, &addr);
                *new_pc = addr;

                return (error);
        case 0x8:       /* ldmxx reg, {..., pc} */
        case 0x9:
                addr = fetch_reg(cookie, (insn >> 16) & 0xf);
                nregs = (insn  & 0x5555) + ((insn  >> 1) & 0x5555);
                nregs = (nregs & 0x3333) + ((nregs >> 2) & 0x3333);
                nregs = (nregs + (nregs >> 4)) & 0x0f0f;
                nregs = (nregs + (nregs >> 8)) & 0x001f;
                switch ((insn >> 23) & 0x3) {
                case 0x0:       /* ldmda */
                        addr = addr - 0;
                        break;
                case 0x1:       /* ldmia */
                        addr = addr + 0 + ((nregs - 1) << 2);
                        break;
                case 0x2:       /* ldmdb */
                        addr = addr - 4;
                        break;
                case 0x3:       /* ldmib */
                        addr = addr + 4 + ((nregs - 1) << 2);
                        break;
                }
                error = read_int(cookie, addr, &addr);
                *new_pc = addr;

                return (error);
        default:
                return (EINVAL);
        }
}

#if __ARM_ARCH >= 6
void
set_stackptrs(int cpu)
{

        set_stackptr(PSR_IRQ32_MODE,
            irqstack + ((IRQ_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
        set_stackptr(PSR_ABT32_MODE,
            abtstack + ((ABT_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
        set_stackptr(PSR_UND32_MODE,
            undstack + ((UND_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
}
#else
void
set_stackptrs(int cpu)
{

        set_stackptr(PSR_IRQ32_MODE,
            irqstack.pv_va + ((IRQ_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
        set_stackptr(PSR_ABT32_MODE,
            abtstack.pv_va + ((ABT_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
        set_stackptr(PSR_UND32_MODE,
            undstack.pv_va + ((UND_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
}
#endif

#ifdef EFI
#define efi_next_descriptor(ptr, size) \
        ((struct efi_md *)(((uint8_t *) ptr) + size))

static void
add_efi_map_entries(struct efi_map_header *efihdr, struct mem_region *mr,
    int *mrcnt)
{
        struct efi_md *map, *p;
        const char *type;
        size_t efisz, memory_size;
        int ndesc, i, j;

        static const char *types[] = {
                "Reserved",
                "LoaderCode",
                "LoaderData",
                "BootServicesCode",
                "BootServicesData",
                "RuntimeServicesCode",
                "RuntimeServicesData",
                "ConventionalMemory",
                "UnusableMemory",
                "ACPIReclaimMemory",
                "ACPIMemoryNVS",
                "MemoryMappedIO",
                "MemoryMappedIOPortSpace",
                "PalCode"
        };

        *mrcnt = 0;

        /*
         * Memory map data provided by UEFI via the GetMemoryMap
         * Boot Services API.
         */
        efisz = roundup2(sizeof(struct efi_map_header), 0x10);
        map = (struct efi_md *)((uint8_t *)efihdr + efisz);

        if (efihdr->descriptor_size == 0)
                return;
        ndesc = efihdr->memory_size / efihdr->descriptor_size;

        if (boothowto & RB_VERBOSE)
                printf("%23s %12s %12s %8s %4s\n",
                    "Type", "Physical", "Virtual", "#Pages", "Attr");

        memory_size = 0;
        for (i = 0, j = 0, p = map; i < ndesc; i++,
            p = efi_next_descriptor(p, efihdr->descriptor_size)) {
                if (boothowto & RB_VERBOSE) {
                        if (p->md_type <= EFI_MD_TYPE_PALCODE)
                                type = types[p->md_type];
                        else
                                type = "<INVALID>";
                        printf("%23s %012llx %12p %08llx ", type, p->md_phys,
                            p->md_virt, p->md_pages);
                        if (p->md_attr & EFI_MD_ATTR_UC)
                                printf("UC ");
                        if (p->md_attr & EFI_MD_ATTR_WC)
                                printf("WC ");
                        if (p->md_attr & EFI_MD_ATTR_WT)
                                printf("WT ");
                        if (p->md_attr & EFI_MD_ATTR_WB)
                                printf("WB ");
                        if (p->md_attr & EFI_MD_ATTR_UCE)
                                printf("UCE ");
                        if (p->md_attr & EFI_MD_ATTR_WP)
                                printf("WP ");
                        if (p->md_attr & EFI_MD_ATTR_RP)
                                printf("RP ");
                        if (p->md_attr & EFI_MD_ATTR_XP)
                                printf("XP ");
                        if (p->md_attr & EFI_MD_ATTR_RT)
                                printf("RUNTIME");
                        printf("\n");
                }

                switch (p->md_type) {
                case EFI_MD_TYPE_CODE:
                case EFI_MD_TYPE_DATA:
                case EFI_MD_TYPE_BS_CODE:
                case EFI_MD_TYPE_BS_DATA:
                case EFI_MD_TYPE_FREE:
                        /*
                         * We're allowed to use any entry with these types.
                         */
                        break;
                default:
                        continue;
                }

                j++;
                if (j >= FDT_MEM_REGIONS)
                        break;

                mr[j].mr_start = p->md_phys;
                mr[j].mr_size = p->md_pages * PAGE_SIZE;
                memory_size += mr[j].mr_size;
        }

        *mrcnt = j;
}
#endif /* EFI */

#ifdef FDT
static char *
kenv_next(char *cp)
{

        if (cp != NULL) {
                while (*cp != 0)
                        cp++;
                cp++;
                if (*cp == 0)
                        cp = NULL;
        }
        return (cp);
}

static void
print_kenv(void)
{
        char *cp;

        debugf("loader passed (static) kenv:\n");
        if (loader_envp == NULL) {
                debugf(" no env, null ptr\n");
                return;
        }
        debugf(" loader_envp = 0x%08x\n", (uint32_t)loader_envp);

        for (cp = loader_envp; cp != NULL; cp = kenv_next(cp))
                debugf(" %x %s\n", (uint32_t)cp, cp);
}

#if __ARM_ARCH < 6
void *
initarm(struct arm_boot_params *abp)
{
        struct mem_region mem_regions[FDT_MEM_REGIONS];
        struct pv_addr kernel_l1pt;
        struct pv_addr dpcpu;
        vm_offset_t dtbp, freemempos, l2_start, lastaddr;
        uint64_t memsize;
        uint32_t l2size;
        char *env;
        void *kmdp;
        u_int l1pagetable;
        int i, j, err_devmap, mem_regions_sz;

        lastaddr = parse_boot_param(abp);
        arm_physmem_kernaddr = abp->abp_physaddr;

        memsize = 0;

        cpuinfo_init();
        set_cpufuncs();

        /*
         * Find the dtb passed in by the boot loader.
         */
        kmdp = preload_search_by_type("elf kernel");
        if (kmdp != NULL)
                dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
        else
                dtbp = (vm_offset_t)NULL;

#if defined(FDT_DTB_STATIC)
        /*
         * In case the device tree blob was not retrieved (from metadata) try
         * to use the statically embedded one.
         */
        if (dtbp == (vm_offset_t)NULL)
                dtbp = (vm_offset_t)&fdt_static_dtb;
#endif

        if (OF_install(OFW_FDT, 0) == FALSE)
                panic("Cannot install FDT");

        if (OF_init((void *)dtbp) != 0)
                panic("OF_init failed with the found device tree");

        /* Grab physical memory regions information from device tree. */
        if (fdt_get_mem_regions(mem_regions, &mem_regions_sz, &memsize) != 0)
                panic("Cannot get physical memory regions");
        arm_physmem_hardware_regions(mem_regions, mem_regions_sz);

        /* Grab reserved memory regions information from device tree. */
        if (fdt_get_reserved_regions(mem_regions, &mem_regions_sz) == 0)
                arm_physmem_exclude_regions(mem_regions, mem_regions_sz,
                    EXFLAG_NODUMP | EXFLAG_NOALLOC);

        /* Platform-specific initialisation */
        platform_probe_and_attach();

        pcpu0_init();

        /* Do basic tuning, hz etc */
        init_param1();

        /* Calculate number of L2 tables needed for mapping vm_page_array */
        l2size = (memsize / PAGE_SIZE) * sizeof(struct vm_page);
        l2size = (l2size >> L1_S_SHIFT) + 1;

        /*
         * Add one table for end of kernel map, one for stacks, msgbuf and
         * L1 and L2 tables map and one for vectors map.
         */
        l2size += 3;

        /* Make it divisible by 4 */
        l2size = (l2size + 3) & ~3;

        freemempos = (lastaddr + PAGE_MASK) & ~PAGE_MASK;

        /* Define a macro to simplify memory allocation */
#define valloc_pages(var, np)                                           \
        alloc_pages((var).pv_va, (np));                                 \
        (var).pv_pa = (var).pv_va + (abp->abp_physaddr - KERNVIRTADDR);

#define alloc_pages(var, np)                                            \
        (var) = freemempos;                                             \
        freemempos += (np * PAGE_SIZE);                                 \
        memset((char *)(var), 0, ((np) * PAGE_SIZE));

        while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
                freemempos += PAGE_SIZE;
        valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);

        for (i = 0, j = 0; i < l2size; ++i) {
                if (!(i % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
                        valloc_pages(kernel_pt_table[i],
                            L2_TABLE_SIZE / PAGE_SIZE);
                        j = i;
                } else {
                        kernel_pt_table[i].pv_va = kernel_pt_table[j].pv_va +
                            L2_TABLE_SIZE_REAL * (i - j);
                        kernel_pt_table[i].pv_pa =
                            kernel_pt_table[i].pv_va - KERNVIRTADDR +
                            abp->abp_physaddr;

                }
        }
        /*
         * Allocate a page for the system page mapped to 0x00000000
         * or 0xffff0000. This page will just contain the system vectors
         * and can be shared by all processes.
         */
        valloc_pages(systempage, 1);

        /* Allocate dynamic per-cpu area. */
        valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
        dpcpu_init((void *)dpcpu.pv_va, 0);

        /* Allocate stacks for all modes */
        valloc_pages(irqstack, IRQ_STACK_SIZE * MAXCPU);
        valloc_pages(abtstack, ABT_STACK_SIZE * MAXCPU);
        valloc_pages(undstack, UND_STACK_SIZE * MAXCPU);
        valloc_pages(kernelstack, kstack_pages * MAXCPU);
        valloc_pages(msgbufpv, round_page(msgbufsize) / PAGE_SIZE);

        /*
         * Now we start construction of the L1 page table
         * We start by mapping the L2 page tables into the L1.
         * This means that we can replace L1 mappings later on if necessary
         */
        l1pagetable = kernel_l1pt.pv_va;

        /*
         * Try to map as much as possible of kernel text and data using
         * 1MB section mapping and for the rest of initial kernel address
         * space use L2 coarse tables.
         *
         * Link L2 tables for mapping remainder of kernel (modulo 1MB)
         * and kernel structures
         */
        l2_start = lastaddr & ~(L1_S_OFFSET);
        for (i = 0 ; i < l2size - 1; i++)
                pmap_link_l2pt(l1pagetable, l2_start + i * L1_S_SIZE,
                    &kernel_pt_table[i]);

        pmap_curmaxkvaddr = l2_start + (l2size - 1) * L1_S_SIZE;

        /* Map kernel code and data */
        pmap_map_chunk(l1pagetable, KERNVIRTADDR, abp->abp_physaddr,
           (((uint32_t)(lastaddr) - KERNVIRTADDR) + PAGE_MASK) & ~PAGE_MASK,
            VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);

        /* Map L1 directory and allocated L2 page tables */
        pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
            L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);

        pmap_map_chunk(l1pagetable, kernel_pt_table[0].pv_va,
            kernel_pt_table[0].pv_pa,
            L2_TABLE_SIZE_REAL * l2size,
            VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);

        /* Map allocated DPCPU, stacks and msgbuf */
        pmap_map_chunk(l1pagetable, dpcpu.pv_va, dpcpu.pv_pa,
            freemempos - dpcpu.pv_va,
            VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);

        /* Link and map the vector page */
        pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH,
            &kernel_pt_table[l2size - 1]);
        pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
            VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE, PTE_CACHE);

        /* Establish static device mappings. */
        err_devmap = platform_devmap_init();
        arm_devmap_bootstrap(l1pagetable, NULL);
        vm_max_kernel_address = platform_lastaddr();

        cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) | DOMAIN_CLIENT);
        pmap_pa = kernel_l1pt.pv_pa;
        cpu_setttb(kernel_l1pt.pv_pa);
        cpu_tlb_flushID();
        cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2));

        /*
         * Now that proper page tables are installed, call cpu_setup() to enable
         * instruction and data caches and other chip-specific features.
         */
        cpu_setup();

        /*
         * Only after the SOC registers block is mapped we can perform device
         * tree fixups, as they may attempt to read parameters from hardware.
         */
        OF_interpret("perform-fixup", 0);

        platform_gpio_init();

        cninit();

        debugf("initarm: console initialized\n");
        debugf(" arg1 kmdp = 0x%08x\n", (uint32_t)kmdp);
        debugf(" boothowto = 0x%08x\n", boothowto);
        debugf(" dtbp = 0x%08x\n", (uint32_t)dtbp);
        print_kenv();

        env = kern_getenv("kernelname");
        if (env != NULL) {
                strlcpy(kernelname, env, sizeof(kernelname));
                freeenv(env);
        }

        if (err_devmap != 0)
                printf("WARNING: could not fully configure devmap, error=%d\n",
                    err_devmap);

        platform_late_init();

        /*
         * Pages were allocated during the secondary bootstrap for the
         * stacks for different CPU modes.
         * We must now set the r13 registers in the different CPU modes to
         * point to these stacks.
         * Since the ARM stacks use STMFD etc. we must set r13 to the top end
         * of the stack memory.
         */
        cpu_control(CPU_CONTROL_MMU_ENABLE, CPU_CONTROL_MMU_ENABLE);

        set_stackptrs(0);

        /*
         * We must now clean the cache again....
         * Cleaning may be done by reading new data to displace any
         * dirty data in the cache. This will have happened in cpu_setttb()
         * but since we are boot strapping the addresses used for the read
         * may have just been remapped and thus the cache could be out
         * of sync. A re-clean after the switch will cure this.
         * After booting there are no gross relocations of the kernel thus
         * this problem will not occur after initarm().
         */
        cpu_idcache_wbinv_all();

        undefined_init();

        init_proc0(kernelstack.pv_va);

        arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
        pmap_bootstrap(freemempos, &kernel_l1pt);
        msgbufp = (void *)msgbufpv.pv_va;
        msgbufinit(msgbufp, msgbufsize);
        mutex_init();

        /*
         * Exclude the kernel (and all the things we allocated which immediately
         * follow the kernel) from the VM allocation pool but not from crash
         * dumps.  virtual_avail is a global variable which tracks the kva we've
         * "allocated" while setting up pmaps.
         *
         * Prepare the list of physical memory available to the vm subsystem.
         */
        arm_physmem_exclude_region(abp->abp_physaddr,
            (virtual_avail - KERNVIRTADDR), EXFLAG_NOALLOC);
        arm_physmem_init_kernel_globals();

        init_param2(physmem);
        dbg_monitor_init();
        kdb_init();

        return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
            sizeof(struct pcb)));
}
#else /* __ARM_ARCH < 6 */
void *
initarm(struct arm_boot_params *abp)
{
        struct mem_region mem_regions[FDT_MEM_REGIONS];
        vm_paddr_t lastaddr;
        vm_offset_t dtbp, kernelstack, dpcpu;
        char *env;
        void *kmdp;
        int err_devmap, mem_regions_sz;
#ifdef EFI
        struct efi_map_header *efihdr;
#endif

        /* get last allocated physical address */
        arm_physmem_kernaddr = abp->abp_physaddr;
        lastaddr = parse_boot_param(abp) - KERNVIRTADDR + arm_physmem_kernaddr;

        set_cpufuncs();
        cpuinfo_init();

        /*
         * Find the dtb passed in by the boot loader.
         */
        kmdp = preload_search_by_type("elf kernel");
        dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
#if defined(FDT_DTB_STATIC)
        /*
         * In case the device tree blob was not retrieved (from metadata) try
         * to use the statically embedded one.
         */
        if (dtbp == (vm_offset_t)NULL)
                dtbp = (vm_offset_t)&fdt_static_dtb;
#endif

        if (OF_install(OFW_FDT, 0) == FALSE)
                panic("Cannot install FDT");

        if (OF_init((void *)dtbp) != 0)
                panic("OF_init failed with the found device tree");

#if defined(LINUX_BOOT_ABI)
        if (loader_envp == NULL && fdt_get_chosen_bootargs(linux_command_line,
            LBABI_MAX_COMMAND_LINE) == 0)
                cmdline_set_env(linux_command_line, CMDLINE_GUARD);
#endif

#ifdef EFI
        efihdr = (struct efi_map_header *)preload_search_info(kmdp,
            MODINFO_METADATA | MODINFOMD_EFI_MAP);
        if (efihdr != NULL) {
                add_efi_map_entries(efihdr, mem_regions, &mem_regions_sz);
        } else
#endif
        {
                /* Grab physical memory regions information from device tree. */
                if (fdt_get_mem_regions(mem_regions, &mem_regions_sz,NULL) != 0)
                        panic("Cannot get physical memory regions");
        }
        arm_physmem_hardware_regions(mem_regions, mem_regions_sz);

        /* Grab reserved memory regions information from device tree. */
        if (fdt_get_reserved_regions(mem_regions, &mem_regions_sz) == 0)
                arm_physmem_exclude_regions(mem_regions, mem_regions_sz,
                    EXFLAG_NODUMP | EXFLAG_NOALLOC);

        /*
         * Set TEX remapping registers.
         * Setup kernel page tables and switch to kernel L1 page table.
         */
        pmap_set_tex();
        pmap_bootstrap_prepare(lastaddr);

        /*
         * Now that proper page tables are installed, call cpu_setup() to enable
         * instruction and data caches and other chip-specific features.
         */
        cpu_setup();

        /* Platform-specific initialisation */
        platform_probe_and_attach();
        pcpu0_init();

        /* Do basic tuning, hz etc */
        init_param1();

        /*
         * Allocate a page for the system page mapped to 0xffff0000
         * This page will just contain the system vectors and can be
         * shared by all processes.
         */
        systempage = pmap_preboot_get_pages(1);

        /* Map the vector page. */
        pmap_preboot_map_pages(systempage, ARM_VECTORS_HIGH,  1);
        if (virtual_end >= ARM_VECTORS_HIGH)
                virtual_end = ARM_VECTORS_HIGH - 1;

        /* Allocate dynamic per-cpu area. */
        dpcpu = pmap_preboot_get_vpages(DPCPU_SIZE / PAGE_SIZE);
        dpcpu_init((void *)dpcpu, 0);

        /* Allocate stacks for all modes */
        irqstack    = pmap_preboot_get_vpages(IRQ_STACK_SIZE * MAXCPU);
        abtstack    = pmap_preboot_get_vpages(ABT_STACK_SIZE * MAXCPU);
        undstack    = pmap_preboot_get_vpages(UND_STACK_SIZE * MAXCPU );
        kernelstack = pmap_preboot_get_vpages(kstack_pages * MAXCPU);

        /* Allocate message buffer. */
        msgbufp = (void *)pmap_preboot_get_vpages(
            round_page(msgbufsize) / PAGE_SIZE);

        /*
         * Pages were allocated during the secondary bootstrap for the
         * stacks for different CPU modes.
         * We must now set the r13 registers in the different CPU modes to
         * point to these stacks.
         * Since the ARM stacks use STMFD etc. we must set r13 to the top end
         * of the stack memory.
         */
        set_stackptrs(0);
        mutex_init();

        /* Establish static device mappings. */
        err_devmap = platform_devmap_init();
        arm_devmap_bootstrap(0, NULL);
        vm_max_kernel_address = platform_lastaddr();

        /*
         * Only after the SOC registers block is mapped we can perform device
         * tree fixups, as they may attempt to read parameters from hardware.
         */
        OF_interpret("perform-fixup", 0);
        platform_gpio_init();
        cninit();

        debugf("initarm: console initialized\n");
        debugf(" arg1 kmdp = 0x%08x\n", (uint32_t)kmdp);
        debugf(" boothowto = 0x%08x\n", boothowto);
        debugf(" dtbp = 0x%08x\n", (uint32_t)dtbp);
        debugf(" lastaddr1: 0x%08x\n", lastaddr);
        print_kenv();

        env = kern_getenv("kernelname");
        if (env != NULL)
                strlcpy(kernelname, env, sizeof(kernelname));

        if (err_devmap != 0)
                printf("WARNING: could not fully configure devmap, error=%d\n",
                    err_devmap);

        platform_late_init();

        /*
         * We must now clean the cache again....
         * Cleaning may be done by reading new data to displace any
         * dirty data in the cache. This will have happened in cpu_setttb()
         * but since we are boot strapping the addresses used for the read
         * may have just been remapped and thus the cache could be out
         * of sync. A re-clean after the switch will cure this.
         * After booting there are no gross relocations of the kernel thus
         * this problem will not occur after initarm().
         */
        /* Set stack for exception handlers */
        undefined_init();
        init_proc0(kernelstack);
        arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
        enable_interrupts(PSR_A);
        pmap_bootstrap(0);

        /* Exclude the kernel (and all the things we allocated which immediately
         * follow the kernel) from the VM allocation pool but not from crash
         * dumps.  virtual_avail is a global variable which tracks the kva we've
         * "allocated" while setting up pmaps.
         *
         * Prepare the list of physical memory available to the vm subsystem.
         */
        arm_physmem_exclude_region(abp->abp_physaddr,
                pmap_preboot_get_pages(0) - abp->abp_physaddr, EXFLAG_NOALLOC);
        arm_physmem_init_kernel_globals();

        init_param2(physmem);
        /* Init message buffer. */
        msgbufinit(msgbufp, msgbufsize);
        dbg_monitor_init();
        kdb_init();
        return ((void *)STACKALIGN(thread0.td_pcb));

}

#endif /* __ARM_ARCH < 6 */
#endif /* FDT */

uint32_t (*arm_cpu_fill_vdso_timehands)(struct vdso_timehands *,
    struct timecounter *);

uint32_t
cpu_fill_vdso_timehands(struct vdso_timehands *vdso_th, struct timecounter *tc)
{

        return (arm_cpu_fill_vdso_timehands != NULL ?
            arm_cpu_fill_vdso_timehands(vdso_th, tc) : 0);
}