/* * * Copyright (c) 2004 Christian Limpach. * Copyright (c) 2004-2006,2008 Kip Macy * All rights reserved. * * 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 Christian Limpach. * 4. The name of the author may not 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 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. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef SMP #include #endif #include #define IDTVEC(name) __CONCAT(X,name) extern inthand_t IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), IDTVEC(xmm), IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall); int xendebug_flags; start_info_t *xen_start_info; shared_info_t *HYPERVISOR_shared_info; xen_pfn_t *xen_machine_phys = machine_to_phys_mapping; xen_pfn_t *xen_phys_machine; xen_pfn_t *xen_pfn_to_mfn_frame_list[16]; xen_pfn_t *xen_pfn_to_mfn_frame_list_list; int preemptable, init_first; extern unsigned int avail_space; void ni_cli(void); void ni_sti(void); void ni_cli(void) { CTR0(KTR_SPARE2, "ni_cli disabling interrupts"); __asm__("pushl %edx;" "pushl %eax;" ); __cli(); __asm__("popl %eax;" "popl %edx;" ); } void ni_sti(void) { __asm__("pushl %edx;" "pushl %esi;" "pushl %eax;" ); __sti(); __asm__("popl %eax;" "popl %esi;" "popl %edx;" ); } /* * Modify the cmd_line by converting ',' to NULLs so that it is in a format * suitable for the static env vars. */ char * xen_setbootenv(char *cmd_line) { char *cmd_line_next; /* Skip leading spaces */ for (; *cmd_line == ' '; cmd_line++); printk("xen_setbootenv(): cmd_line='%s'\n", cmd_line); for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;); return cmd_line; } static struct { const char *ev; int mask; } howto_names[] = { {"boot_askname", RB_ASKNAME}, {"boot_single", RB_SINGLE}, {"boot_nosync", RB_NOSYNC}, {"boot_halt", RB_ASKNAME}, {"boot_serial", RB_SERIAL}, {"boot_cdrom", RB_CDROM}, {"boot_gdb", RB_GDB}, {"boot_gdb_pause", RB_RESERVED1}, {"boot_verbose", RB_VERBOSE}, {"boot_multicons", RB_MULTIPLE}, {NULL, 0} }; int xen_boothowto(char *envp) { int i, howto = 0; /* get equivalents from the environment */ for (i = 0; howto_names[i].ev != NULL; i++) if (getenv(howto_names[i].ev) != NULL) howto |= howto_names[i].mask; return howto; } #define PRINTK_BUFSIZE 1024 void printk(const char *fmt, ...) { __va_list ap; int retval; static char buf[PRINTK_BUFSIZE]; va_start(ap, fmt); retval = vsnprintf(buf, PRINTK_BUFSIZE - 1, fmt, ap); va_end(ap); buf[retval] = 0; (void)HYPERVISOR_console_write(buf, retval); } #define XPQUEUE_SIZE 128 struct mmu_log { char *file; int line; }; #ifdef SMP /* per-cpu queues and indices */ #ifdef INVARIANTS static struct mmu_log xpq_queue_log[MAX_VIRT_CPUS][XPQUEUE_SIZE]; #endif static int xpq_idx[MAX_VIRT_CPUS]; static mmu_update_t xpq_queue[MAX_VIRT_CPUS][XPQUEUE_SIZE]; #define XPQ_QUEUE_LOG xpq_queue_log[vcpu] #define XPQ_QUEUE xpq_queue[vcpu] #define XPQ_IDX xpq_idx[vcpu] #define SET_VCPU() int vcpu = smp_processor_id() #else static mmu_update_t xpq_queue[XPQUEUE_SIZE]; static struct mmu_log xpq_queue_log[XPQUEUE_SIZE]; static int xpq_idx = 0; #define XPQ_QUEUE_LOG xpq_queue_log #define XPQ_QUEUE xpq_queue #define XPQ_IDX xpq_idx #define SET_VCPU() #endif /* !SMP */ #define XPQ_IDX_INC atomic_add_int(&XPQ_IDX, 1); #if 0 static void xen_dump_queue(void) { int _xpq_idx = XPQ_IDX; int i; if (_xpq_idx <= 1) return; printk("xen_dump_queue(): %u entries\n", _xpq_idx); for (i = 0; i < _xpq_idx; i++) { printk(" val: %llx ptr: %llx\n", XPQ_QUEUE[i].val, XPQ_QUEUE[i].ptr); } } #endif static __inline void _xen_flush_queue(void) { SET_VCPU(); int _xpq_idx = XPQ_IDX; int error, i; /* window of vulnerability here? */ if (__predict_true(gdtset)) critical_enter(); XPQ_IDX = 0; /* Make sure index is cleared first to avoid double updates. */ error = HYPERVISOR_mmu_update((mmu_update_t *)&XPQ_QUEUE, _xpq_idx, NULL, DOMID_SELF); #if 0 if (__predict_true(gdtset)) for (i = _xpq_idx; i > 0;) { if (i >= 3) { CTR6(KTR_PMAP, "mmu:val: %lx ptr: %lx val: %lx " "ptr: %lx val: %lx ptr: %lx", (XPQ_QUEUE[i-1].val & 0xffffffff), (XPQ_QUEUE[i-1].ptr & 0xffffffff), (XPQ_QUEUE[i-2].val & 0xffffffff), (XPQ_QUEUE[i-2].ptr & 0xffffffff), (XPQ_QUEUE[i-3].val & 0xffffffff), (XPQ_QUEUE[i-3].ptr & 0xffffffff)); i -= 3; } else if (i == 2) { CTR4(KTR_PMAP, "mmu: val: %lx ptr: %lx val: %lx ptr: %lx", (XPQ_QUEUE[i-1].val & 0xffffffff), (XPQ_QUEUE[i-1].ptr & 0xffffffff), (XPQ_QUEUE[i-2].val & 0xffffffff), (XPQ_QUEUE[i-2].ptr & 0xffffffff)); i = 0; } else { CTR2(KTR_PMAP, "mmu: val: %lx ptr: %lx", (XPQ_QUEUE[i-1].val & 0xffffffff), (XPQ_QUEUE[i-1].ptr & 0xffffffff)); i = 0; } } #endif if (__predict_true(gdtset)) critical_exit(); if (__predict_false(error < 0)) { for (i = 0; i < _xpq_idx; i++) printf("val: %llx ptr: %llx\n", XPQ_QUEUE[i].val, XPQ_QUEUE[i].ptr); panic("Failed to execute MMU updates: %d", error); } } void xen_flush_queue(void) { SET_VCPU(); if (XPQ_IDX != 0) _xen_flush_queue(); } static __inline void xen_increment_idx(void) { SET_VCPU(); XPQ_IDX++; if (__predict_false(XPQ_IDX == XPQUEUE_SIZE)) xen_flush_queue(); } void xen_check_queue(void) { #ifdef INVARIANTS SET_VCPU(); KASSERT(XPQ_IDX == 0, ("pending operations XPQ_IDX=%d", XPQ_IDX)); #endif } void xen_invlpg(vm_offset_t va) { struct mmuext_op op; op.cmd = MMUEXT_INVLPG_ALL; op.arg1.linear_addr = va & ~PAGE_MASK; PANIC_IF(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0); } void xen_load_cr3(u_int val) { struct mmuext_op op; #ifdef INVARIANTS SET_VCPU(); KASSERT(XPQ_IDX == 0, ("pending operations XPQ_IDX=%d", XPQ_IDX)); #endif op.cmd = MMUEXT_NEW_BASEPTR; op.arg1.mfn = xpmap_ptom(val) >> PAGE_SHIFT; PANIC_IF(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0); } #ifdef KTR static __inline u_int rebp(void) { u_int data; __asm __volatile("movl 4(%%ebp),%0" : "=r" (data)); return (data); } #endif u_int read_eflags(void) { vcpu_info_t *_vcpu; u_int eflags; eflags = _read_eflags(); _vcpu = &HYPERVISOR_shared_info->vcpu_info[smp_processor_id()]; if (_vcpu->evtchn_upcall_mask) eflags &= ~PSL_I; return (eflags); } void write_eflags(u_int eflags) { u_int intr; CTR2(KTR_SPARE2, "%x xen_restore_flags eflags %x", rebp(), eflags); intr = ((eflags & PSL_I) == 0); __restore_flags(intr); _write_eflags(eflags); } void xen_cli(void) { CTR1(KTR_SPARE2, "%x xen_cli disabling interrupts", rebp()); __cli(); } void xen_sti(void) { CTR1(KTR_SPARE2, "%x xen_sti enabling interrupts", rebp()); __sti(); } u_int xen_rcr2(void) { return (HYPERVISOR_shared_info->vcpu_info[curcpu].arch.cr2); } void _xen_machphys_update(vm_paddr_t mfn, vm_paddr_t pfn, char *file, int line) { SET_VCPU(); if (__predict_true(gdtset)) critical_enter(); XPQ_QUEUE[XPQ_IDX].ptr = (mfn << PAGE_SHIFT) | MMU_MACHPHYS_UPDATE; XPQ_QUEUE[XPQ_IDX].val = pfn; #ifdef INVARIANTS XPQ_QUEUE_LOG[XPQ_IDX].file = file; XPQ_QUEUE_LOG[XPQ_IDX].line = line; #endif xen_increment_idx(); if (__predict_true(gdtset)) critical_exit(); } void _xen_queue_pt_update(vm_paddr_t ptr, vm_paddr_t val, char *file, int line) { SET_VCPU(); if (__predict_true(gdtset)) mtx_assert(&vm_page_queue_mtx, MA_OWNED); KASSERT((ptr & 7) == 0, ("misaligned update")); if (__predict_true(gdtset)) critical_enter(); XPQ_QUEUE[XPQ_IDX].ptr = ((uint64_t)ptr) | MMU_NORMAL_PT_UPDATE; XPQ_QUEUE[XPQ_IDX].val = (uint64_t)val; #ifdef INVARIANTS XPQ_QUEUE_LOG[XPQ_IDX].file = file; XPQ_QUEUE_LOG[XPQ_IDX].line = line; #endif xen_increment_idx(); if (__predict_true(gdtset)) critical_exit(); } void xen_pgdpt_pin(vm_paddr_t ma) { struct mmuext_op op; op.cmd = MMUEXT_PIN_L3_TABLE; op.arg1.mfn = ma >> PAGE_SHIFT; xen_flush_queue(); PANIC_IF(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0); } void xen_pgd_pin(vm_paddr_t ma) { struct mmuext_op op; op.cmd = MMUEXT_PIN_L2_TABLE; op.arg1.mfn = ma >> PAGE_SHIFT; xen_flush_queue(); PANIC_IF(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0); } void xen_pgd_unpin(vm_paddr_t ma) { struct mmuext_op op; op.cmd = MMUEXT_UNPIN_TABLE; op.arg1.mfn = ma >> PAGE_SHIFT; xen_flush_queue(); PANIC_IF(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0); } void xen_pt_pin(vm_paddr_t ma) { struct mmuext_op op; op.cmd = MMUEXT_PIN_L1_TABLE; op.arg1.mfn = ma >> PAGE_SHIFT; xen_flush_queue(); PANIC_IF(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0); } void xen_pt_unpin(vm_paddr_t ma) { struct mmuext_op op; op.cmd = MMUEXT_UNPIN_TABLE; op.arg1.mfn = ma >> PAGE_SHIFT; xen_flush_queue(); PANIC_IF(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0); } void xen_set_ldt(vm_paddr_t ptr, unsigned long len) { struct mmuext_op op; op.cmd = MMUEXT_SET_LDT; op.arg1.linear_addr = ptr; op.arg2.nr_ents = len; xen_flush_queue(); PANIC_IF(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0); } void xen_tlb_flush(void) { struct mmuext_op op; op.cmd = MMUEXT_TLB_FLUSH_LOCAL; xen_flush_queue(); PANIC_IF(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0); } void xen_update_descriptor(union descriptor *table, union descriptor *entry) { vm_paddr_t pa; pt_entry_t *ptp; ptp = vtopte((vm_offset_t)table); pa = (*ptp & PG_FRAME) | ((vm_offset_t)table & PAGE_MASK); if (HYPERVISOR_update_descriptor(pa, *(uint64_t *)entry)) panic("HYPERVISOR_update_descriptor failed\n"); } #if 0 /* * Bitmap is indexed by page number. If bit is set, the page is part of a * xen_create_contiguous_region() area of memory. */ unsigned long *contiguous_bitmap; static void contiguous_bitmap_set(unsigned long first_page, unsigned long nr_pages) { unsigned long start_off, end_off, curr_idx, end_idx; curr_idx = first_page / BITS_PER_LONG; start_off = first_page & (BITS_PER_LONG-1); end_idx = (first_page + nr_pages) / BITS_PER_LONG; end_off = (first_page + nr_pages) & (BITS_PER_LONG-1); if (curr_idx == end_idx) { contiguous_bitmap[curr_idx] |= ((1UL<> PAGE_SHIFT; mfn = PFNTOMFN(pfn); PFNTOMFN(pfn) = INVALID_P2M_ENTRY; PANIC_IF(HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation) != 1); } /* 2. Get a new contiguous memory extent. */ reservation.extent_order = order; /* xenlinux hardcodes this because of aacraid - maybe set to 0 if we're not * running with a broxen driver XXXEN */ reservation.address_bits = 31; if (HYPERVISOR_memory_op(XENMEM_increase_reservation, &reservation) != 1) goto fail; /* 3. Map the new extent in place of old pages. */ for (i = 0; i < (1 << order); i++) { int pfn; pfn = VM_PAGE_TO_PHYS(&pages[i]) >> PAGE_SHIFT; xen_machphys_update(mfn+i, pfn); PFNTOMFN(pfn) = mfn+i; } xen_tlb_flush(); #if 0 contiguous_bitmap_set(VM_PAGE_TO_PHYS(&pages[0]) >> PAGE_SHIFT, 1UL << order); #endif balloon_unlock(flags); return 0; fail: reservation.extent_order = 0; reservation.address_bits = 0; for (i = 0; i < (1 << order); i++) { int pfn; pfn = VM_PAGE_TO_PHYS(&pages[i]) >> PAGE_SHIFT; PANIC_IF(HYPERVISOR_memory_op( XENMEM_increase_reservation, &reservation) != 1); xen_machphys_update(mfn, pfn); PFNTOMFN(pfn) = mfn; } xen_tlb_flush(); balloon_unlock(flags); return ENOMEM; } void xen_destroy_contiguous_region(void *addr, int npages) { unsigned long mfn, i, flags, order, pfn0; struct xen_memory_reservation reservation = { .nr_extents = 1, .extent_order = 0, .domid = DOMID_SELF }; set_xen_guest_handle(reservation.extent_start, &mfn); pfn0 = vtophys(addr) >> PAGE_SHIFT; #if 0 scrub_pages(vstart, 1 << order); #endif /* can currently only handle power of two allocation */ PANIC_IF(ffs(npages) != fls(npages)); /* 0. determine order */ order = (ffs(npages) == fls(npages)) ? fls(npages) - 1 : fls(npages); balloon_lock(flags); #if 0 contiguous_bitmap_clear(vtophys(addr) >> PAGE_SHIFT, 1UL << order); #endif /* 1. Zap current PTEs, giving away the underlying pages. */ for (i = 0; i < (1 << order); i++) { int pfn; uint64_t new_val = 0; pfn = vtomach((char *)addr + i*PAGE_SIZE) >> PAGE_SHIFT; PANIC_IF(HYPERVISOR_update_va_mapping((vm_offset_t)((char *)addr + (i * PAGE_SIZE)), new_val, 0)); PFNTOMFN(pfn) = INVALID_P2M_ENTRY; PANIC_IF(HYPERVISOR_memory_op( XENMEM_decrease_reservation, &reservation) != 1); } /* 2. Map new pages in place of old pages. */ for (i = 0; i < (1 << order); i++) { int pfn; uint64_t new_val; pfn = pfn0 + i; PANIC_IF(HYPERVISOR_memory_op(XENMEM_increase_reservation, &reservation) != 1); new_val = mfn << PAGE_SHIFT; PANIC_IF(HYPERVISOR_update_va_mapping((vm_offset_t)addr + (i * PAGE_SIZE), new_val, PG_KERNEL)); xen_machphys_update(mfn, pfn); PFNTOMFN(pfn) = mfn; } xen_tlb_flush(); balloon_unlock(flags); } extern unsigned long cpu0prvpage; extern unsigned long *SMPpt; extern struct user *proc0uarea; extern vm_offset_t proc0kstack; extern int vm86paddr, vm86phystk; char *bootmem_start, *bootmem_current, *bootmem_end; pteinfo_t *pteinfo_list; void initvalues(start_info_t *startinfo); struct xenstore_domain_interface; extern struct xenstore_domain_interface *xen_store; char *console_page; void * bootmem_alloc(unsigned int size) { char *retptr; retptr = bootmem_current; PANIC_IF(retptr + size > bootmem_end); bootmem_current += size; return retptr; } void bootmem_free(void *ptr, unsigned int size) { char *tptr; tptr = ptr; PANIC_IF(tptr != bootmem_current - size || bootmem_current - size < bootmem_start); bootmem_current -= size; } #if 0 static vm_paddr_t xpmap_mtop2(vm_paddr_t mpa) { return ((machine_to_phys_mapping[mpa >> PAGE_SHIFT] << PAGE_SHIFT) ) | (mpa & ~PG_FRAME); } static pd_entry_t xpmap_get_bootpde(vm_paddr_t va) { return ((pd_entry_t *)xen_start_info->pt_base)[va >> 22]; } static pd_entry_t xpmap_get_vbootpde(vm_paddr_t va) { pd_entry_t pde; pde = xpmap_get_bootpde(va); if ((pde & PG_V) == 0) return (pde & ~PG_FRAME); return (pde & ~PG_FRAME) | (xpmap_mtop2(pde & PG_FRAME) + KERNBASE); } static pt_entry_t 8* xpmap_get_bootptep(vm_paddr_t va) { pd_entry_t pde; pde = xpmap_get_vbootpde(va); if ((pde & PG_V) == 0) return (void *)-1; #define PT_MASK 0x003ff000 /* page table address bits */ return &(((pt_entry_t *)(pde & PG_FRAME))[(va & PT_MASK) >> PAGE_SHIFT]); } static pt_entry_t xpmap_get_bootpte(vm_paddr_t va) { return xpmap_get_bootptep(va)[0]; } #endif #ifdef ADD_ISA_HOLE static void shift_phys_machine(unsigned long *phys_machine, int nr_pages) { unsigned long *tmp_page, *current_page, *next_page; int i; tmp_page = bootmem_alloc(PAGE_SIZE); current_page = phys_machine + nr_pages - (PAGE_SIZE/sizeof(unsigned long)); next_page = current_page - (PAGE_SIZE/sizeof(unsigned long)); bcopy(phys_machine, tmp_page, PAGE_SIZE); while (current_page > phys_machine) { /* save next page */ bcopy(next_page, tmp_page, PAGE_SIZE); /* shift down page */ bcopy(current_page, next_page, PAGE_SIZE); /* finish swap */ bcopy(tmp_page, current_page, PAGE_SIZE); current_page -= (PAGE_SIZE/sizeof(unsigned long)); next_page -= (PAGE_SIZE/sizeof(unsigned long)); } bootmem_free(tmp_page, PAGE_SIZE); for (i = 0; i < nr_pages; i++) { xen_machphys_update(phys_machine[i], i); } memset(phys_machine, INVALID_P2M_ENTRY, PAGE_SIZE); } #endif /* ADD_ISA_HOLE */ /* * Build a directory of the pages that make up our Physical to Machine * mapping table. The Xen suspend/restore code uses this to find our * mapping table. */ static void init_frame_list_list(void *arg) { unsigned long nr_pages = xen_start_info->nr_pages; #define FPP (PAGE_SIZE/sizeof(xen_pfn_t)) int i, j, k; xen_pfn_to_mfn_frame_list_list = malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK); for (i = 0, j = 0, k = -1; i < nr_pages; i += FPP, j++) { if ((j & (FPP - 1)) == 0) { k++; xen_pfn_to_mfn_frame_list[k] = malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK); xen_pfn_to_mfn_frame_list_list[k] = VTOMFN(xen_pfn_to_mfn_frame_list[k]); j = 0; } xen_pfn_to_mfn_frame_list[k][j] = VTOMFN(&xen_phys_machine[i]); } HYPERVISOR_shared_info->arch.max_pfn = nr_pages; HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = VTOMFN(xen_pfn_to_mfn_frame_list_list); } SYSINIT(init_fll, SI_SUB_DEVFS, SI_ORDER_ANY, init_frame_list_list, NULL); extern unsigned long physfree; int pdir, curoffset; extern int nkpt; void initvalues(start_info_t *startinfo) { int l3_pages, l2_pages, l1_pages, offset; vm_offset_t cur_space, cur_space_pt; struct physdev_set_iopl set_iopl; vm_paddr_t KPTphys, IdlePTDma; vm_paddr_t console_page_ma, xen_store_ma; vm_offset_t KPTphysoff, tmpva; vm_paddr_t shinfo; #ifdef PAE vm_paddr_t IdlePDPTma, IdlePDPTnewma; vm_paddr_t IdlePTDnewma[4]; pd_entry_t *IdlePDPTnew, *IdlePTDnew; #else vm_paddr_t pdir_shadow_ma; #endif unsigned long i; int ncpus = MAXCPU; nkpt = min( min( max((startinfo->nr_pages >> NPGPTD_SHIFT), nkpt), NPGPTD*NPDEPG - KPTDI), (HYPERVISOR_VIRT_START - KERNBASE) >> PDRSHIFT); HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments); #ifdef notyet /* * need to install handler */ HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments_notify); #endif xen_start_info = startinfo; xen_phys_machine = (xen_pfn_t *)startinfo->mfn_list; IdlePTD = (pd_entry_t *)((uint8_t *)startinfo->pt_base + PAGE_SIZE); l1_pages = 0; #ifdef PAE l3_pages = 1; l2_pages = 0; IdlePDPT = (pd_entry_t *)startinfo->pt_base; IdlePDPTma = xpmap_ptom(VTOP(startinfo->pt_base)); for (i = (KERNBASE >> 30); (i < 4) && (IdlePDPT[i] != 0); i++) l2_pages++; /* * Note that only one page directory has been allocated at this point. * Thus, if KERNBASE */ #if 0 for (i = 0; i < l2_pages; i++) IdlePTDma[i] = xpmap_ptom(VTOP(IdlePTD + i*PAGE_SIZE)); #endif l2_pages = (l2_pages == 0) ? 1 : l2_pages; #else l3_pages = 0; l2_pages = 1; #endif for (i = (((KERNBASE>>18) & PAGE_MASK)>>PAGE_SHIFT); (i>PDRSHIFT)); i++) { if (IdlePTD[i] == 0) break; l1_pages++; } /* number of pages allocated after the pts + 1*/; cur_space = xen_start_info->pt_base + ((xen_start_info->nr_pt_frames) + 3 )*PAGE_SIZE; printk("initvalues(): wooh - availmem=%x,%x\n", avail_space, cur_space); printk("KERNBASE=%x,pt_base=%x, VTOPFN(base)=%x, nr_pt_frames=%x\n", KERNBASE,xen_start_info->pt_base, VTOPFN(xen_start_info->pt_base), xen_start_info->nr_pt_frames); xendebug_flags = 0; /* 0xffffffff; */ /* allocate 4 pages for bootmem allocator */ bootmem_start = bootmem_current = (char *)cur_space; cur_space += (4 * PAGE_SIZE); bootmem_end = (char *)cur_space; /* allocate page for gdt */ gdt = (union descriptor *)cur_space; cur_space += PAGE_SIZE*ncpus; /* allocate page for ldt */ ldt = (union descriptor *)cur_space; cur_space += PAGE_SIZE; cur_space += PAGE_SIZE; HYPERVISOR_shared_info = (shared_info_t *)cur_space; cur_space += PAGE_SIZE; xen_store = (struct xenstore_domain_interface *)cur_space; cur_space += PAGE_SIZE; console_page = (char *)cur_space; cur_space += PAGE_SIZE; #ifdef ADD_ISA_HOLE shift_phys_machine(xen_phys_machine, xen_start_info->nr_pages); #endif /* * pre-zero unused mapped pages - mapped on 4MB boundary */ #ifdef PAE IdlePDPT = (pd_entry_t *)startinfo->pt_base; IdlePDPTma = xpmap_ptom(VTOP(startinfo->pt_base)); /* * Note that only one page directory has been allocated at this point. * Thus, if KERNBASE */ IdlePTD = (pd_entry_t *)((uint8_t *)startinfo->pt_base + PAGE_SIZE); IdlePTDma = xpmap_ptom(VTOP(IdlePTD)); l3_pages = 1; #else IdlePTD = (pd_entry_t *)startinfo->pt_base; IdlePTDma = xpmap_ptom(VTOP(startinfo->pt_base)); l3_pages = 0; #endif l2_pages = 1; l1_pages = xen_start_info->nr_pt_frames - l2_pages - l3_pages; KPTphysoff = (l2_pages + l3_pages)*PAGE_SIZE; KPTphys = xpmap_ptom(VTOP(startinfo->pt_base + KPTphysoff)); XENPRINTF("IdlePTD %p\n", IdlePTD); XENPRINTF("nr_pages: %ld shared_info: 0x%lx flags: 0x%lx pt_base: 0x%lx " "mod_start: 0x%lx mod_len: 0x%lx\n", xen_start_info->nr_pages, xen_start_info->shared_info, xen_start_info->flags, xen_start_info->pt_base, xen_start_info->mod_start, xen_start_info->mod_len); /* Map proc0's KSTACK */ proc0kstack = cur_space; cur_space += (KSTACK_PAGES * PAGE_SIZE); printk("proc0kstack=%u\n", proc0kstack); /* vm86/bios stack */ cur_space += PAGE_SIZE; /* Map space for the vm86 region */ vm86paddr = (vm_offset_t)cur_space; cur_space += (PAGE_SIZE * 3); #ifdef PAE IdlePDPTnew = (pd_entry_t *)cur_space; cur_space += PAGE_SIZE; bzero(IdlePDPTnew, PAGE_SIZE); IdlePDPTnewma = xpmap_ptom(VTOP(IdlePDPTnew)); IdlePTDnew = (pd_entry_t *)cur_space; cur_space += 4*PAGE_SIZE; bzero(IdlePTDnew, 4*PAGE_SIZE); for (i = 0; i < 4; i++) IdlePTDnewma[i] = xpmap_ptom(VTOP((uint8_t *)IdlePTDnew + i*PAGE_SIZE)); /* * L3 * * Copy the 4 machine addresses of the new PTDs in to the PDPT * */ for (i = 0; i < 4; i++) IdlePDPTnew[i] = IdlePTDnewma[i] | PG_V; __asm__("nop;"); /* * * re-map the new PDPT read-only */ PT_SET_MA(IdlePDPTnew, IdlePDPTnewma | PG_V); /* * * Unpin the current PDPT */ xen_pt_unpin(IdlePDPTma); for (i = 0; i < 20; i++) { int startidx = ((KERNBASE >> 18) & PAGE_MASK) >> 3; if (IdlePTD[startidx + i] == 0) { l1_pages = i; break; } } #endif /* PAE */ /* unmap remaining pages from initial 4MB chunk * */ for (tmpva = cur_space; (tmpva & ((1<<22)-1)) != 0; tmpva += PAGE_SIZE) { bzero((char *)tmpva, PAGE_SIZE); PT_SET_MA(tmpva, (vm_paddr_t)0); } PT_UPDATES_FLUSH(); memcpy(((uint8_t *)IdlePTDnew) + ((unsigned int)(KERNBASE >> 18)), ((uint8_t *)IdlePTD) + ((KERNBASE >> 18) & PAGE_MASK), l1_pages*sizeof(pt_entry_t)); for (i = 0; i < 4; i++) { PT_SET_MA((uint8_t *)IdlePTDnew + i*PAGE_SIZE, IdlePTDnewma[i] | PG_V); } xen_load_cr3(VTOP(IdlePDPTnew)); xen_pgdpt_pin(xpmap_ptom(VTOP(IdlePDPTnew))); /* allocate remainder of nkpt pages */ cur_space_pt = cur_space; for (offset = (KERNBASE >> PDRSHIFT), i = l1_pages; i < nkpt; i++, cur_space += PAGE_SIZE) { pdir = (offset + i) / NPDEPG; curoffset = ((offset + i) % NPDEPG); if (((offset + i) << PDRSHIFT) == VM_MAX_KERNEL_ADDRESS) break; /* * make sure that all the initial page table pages * have been zeroed */ PT_SET_MA(cur_space_pt, xpmap_ptom(VTOP(cur_space)) | PG_V | PG_RW); bzero((char *)cur_space_pt, PAGE_SIZE); PT_SET_MA(cur_space_pt, (vm_paddr_t)0); xen_pt_pin(xpmap_ptom(VTOP(cur_space))); xen_queue_pt_update((vm_paddr_t)(IdlePTDnewma[pdir] + curoffset*sizeof(vm_paddr_t)), xpmap_ptom(VTOP(cur_space)) | PG_KERNEL); PT_UPDATES_FLUSH(); } for (i = 0; i < 4; i++) { pdir = (PTDPTDI + i) / NPDEPG; curoffset = (PTDPTDI + i) % NPDEPG; xen_queue_pt_update((vm_paddr_t)(IdlePTDnewma[pdir] + curoffset*sizeof(vm_paddr_t)), IdlePTDnewma[i] | PG_V); } PT_UPDATES_FLUSH(); IdlePTD = IdlePTDnew; IdlePDPT = IdlePDPTnew; IdlePDPTma = IdlePDPTnewma; /* * shared_info is an unsigned long so this will randomly break if * it is allocated above 4GB - I guess people are used to that * sort of thing with Xen ... sigh */ shinfo = xen_start_info->shared_info; PT_SET_MA(HYPERVISOR_shared_info, shinfo | PG_KERNEL); printk("#4\n"); xen_store_ma = (((vm_paddr_t)xen_start_info->store_mfn) << PAGE_SHIFT); PT_SET_MA(xen_store, xen_store_ma | PG_KERNEL); console_page_ma = (((vm_paddr_t)xen_start_info->console.domU.mfn) << PAGE_SHIFT); PT_SET_MA(console_page, console_page_ma | PG_KERNEL); printk("#5\n"); set_iopl.iopl = 1; PANIC_IF(HYPERVISOR_physdev_op(PHYSDEVOP_SET_IOPL, &set_iopl)); printk("#6\n"); #if 0 /* add page table for KERNBASE */ xen_queue_pt_update(IdlePTDma + KPTDI*sizeof(vm_paddr_t), xpmap_ptom(VTOP(cur_space) | PG_KERNEL)); xen_flush_queue(); #ifdef PAE xen_queue_pt_update(pdir_shadow_ma[3] + KPTDI*sizeof(vm_paddr_t), xpmap_ptom(VTOP(cur_space) | PG_V | PG_A)); #else xen_queue_pt_update(pdir_shadow_ma + KPTDI*sizeof(vm_paddr_t), xpmap_ptom(VTOP(cur_space) | PG_V | PG_A)); #endif xen_flush_queue(); cur_space += PAGE_SIZE; printk("#6\n"); #endif /* 0 */ #ifdef notyet if (xen_start_info->flags & SIF_INITDOMAIN) { /* Map first megabyte */ for (i = 0; i < (256 << PAGE_SHIFT); i += PAGE_SIZE) PT_SET_MA(KERNBASE + i, i | PG_KERNEL | PG_NC_PCD); xen_flush_queue(); } #endif /* * re-map kernel text read-only * */ for (i = (((vm_offset_t)&btext) & ~PAGE_MASK); i < (((vm_offset_t)&etext) & ~PAGE_MASK); i += PAGE_SIZE) PT_SET_MA(i, xpmap_ptom(VTOP(i)) | PG_V | PG_A); printk("#7\n"); physfree = VTOP(cur_space); init_first = physfree >> PAGE_SHIFT; IdlePTD = (pd_entry_t *)VTOP(IdlePTD); IdlePDPT = (pd_entry_t *)VTOP(IdlePDPT); setup_xen_features(); printk("#8, proc0kstack=%u\n", proc0kstack); } trap_info_t trap_table[] = { { 0, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(div)}, { 1, 0|4, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(dbg)}, { 3, 3|4, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(bpt)}, { 4, 3, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(ofl)}, /* This is UPL on Linux and KPL on BSD */ { 5, 3, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(bnd)}, { 6, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(ill)}, { 7, 0|4, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(dna)}, /* * { 8, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(XXX)}, * no handler for double fault */ { 9, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(fpusegm)}, {10, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(tss)}, {11, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(missing)}, {12, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(stk)}, {13, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(prot)}, {14, 0|4, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(page)}, {15, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(rsvd)}, {16, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(fpu)}, {17, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(align)}, {18, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(mchk)}, {19, 0, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(xmm)}, {0x80, 3, GSEL(GCODE_SEL, SEL_KPL), (unsigned long) &IDTVEC(int0x80_syscall)}, { 0, 0, 0, 0 } }; /********** CODE WORTH KEEPING ABOVE HERE *****************/ void xen_failsafe_handler(void); void xen_failsafe_handler(void) { panic("xen_failsafe_handler called!\n"); } void xen_handle_thread_switch(struct pcb *pcb); /* This is called by cpu_switch() when switching threads. */ /* The pcb arg refers to the process control block of the */ /* next thread which is to run */ void xen_handle_thread_switch(struct pcb *pcb) { uint32_t *a = (uint32_t *)&PCPU_GET(fsgs_gdt)[0]; uint32_t *b = (uint32_t *)&pcb->pcb_fsd; multicall_entry_t mcl[3]; int i = 0; /* Notify Xen of task switch */ mcl[i].op = __HYPERVISOR_stack_switch; mcl[i].args[0] = GSEL(GDATA_SEL, SEL_KPL); mcl[i++].args[1] = (unsigned long)pcb; /* Check for update of fsd */ if (*a != *b || *(a+1) != *(b+1)) { mcl[i].op = __HYPERVISOR_update_descriptor; *(uint64_t *)&mcl[i].args[0] = vtomach((vm_offset_t)a); *(uint64_t *)&mcl[i++].args[2] = *(uint64_t *)b; } a += 2; b += 2; /* Check for update of gsd */ if (*a != *b || *(a+1) != *(b+1)) { mcl[i].op = __HYPERVISOR_update_descriptor; *(uint64_t *)&mcl[i].args[0] = vtomach((vm_offset_t)a); *(uint64_t *)&mcl[i++].args[2] = *(uint64_t *)b; } (void)HYPERVISOR_multicall(mcl, i); }