/* * GRUB -- GRand Unified Bootloader * Copyright (C) 2013 Free Software Foundation, Inc. * * GRUB is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * GRUB is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GRUB. If not, see . */ #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 GRUB_MOD_LICENSE ("GPLv3+"); #ifdef __x86_64__ #define NUMBER_OF_LEVELS 4 #define INTERMEDIATE_OR (GRUB_PAGE_PRESENT | GRUB_PAGE_RW | GRUB_PAGE_USER) #define VIRT_MASK 0x0000ffffffffffffULL #else #define NUMBER_OF_LEVELS 3 #define INTERMEDIATE_OR (GRUB_PAGE_PRESENT | GRUB_PAGE_RW) #define VIRT_MASK 0x00000000ffffffffULL #define HYPERVISOR_PUD_ADDRESS 0xc0000000ULL #endif struct grub_xen_mapping_lvl { grub_uint64_t virt_start; grub_uint64_t virt_end; grub_uint64_t pfn_start; grub_uint64_t n_pt_pages; }; struct grub_xen_mapping { grub_uint64_t *where; struct grub_xen_mapping_lvl area; struct grub_xen_mapping_lvl lvls[NUMBER_OF_LEVELS]; }; struct xen_loader_state { struct grub_relocator *relocator; struct grub_relocator_xen_state state; struct start_info next_start; struct grub_xen_file_info xen_inf; grub_xen_mfn_t *virt_mfn_list; struct start_info *virt_start_info; grub_xen_mfn_t console_pfn; grub_uint64_t max_addr; grub_uint64_t pgtbl_end; struct xen_multiboot_mod_list *module_info_page; grub_uint64_t modules_target_start; grub_size_t n_modules; struct grub_xen_mapping *map_reloc; struct grub_xen_mapping mappings[XEN_MAX_MAPPINGS]; int n_mappings; int loaded; }; static struct xen_loader_state xen_state; static grub_dl_t my_mod; #define PAGE_SIZE (1UL << PAGE_SHIFT) #define MAX_MODULES (PAGE_SIZE / sizeof (struct xen_multiboot_mod_list)) #define STACK_SIZE 1048576 #define ADDITIONAL_SIZE (1 << 19) #define ALIGN_SIZE (1 << 22) #define LOG_POINTERS_PER_PAGE 9 #define POINTERS_PER_PAGE (1 << LOG_POINTERS_PER_PAGE) static grub_uint64_t page2offset (grub_uint64_t page) { return page << PAGE_SHIFT; } static grub_err_t get_pgtable_size (grub_uint64_t from, grub_uint64_t to, grub_uint64_t pfn) { struct grub_xen_mapping *map, *map_cmp; grub_uint64_t mask, bits; int i, m; if (xen_state.n_mappings == XEN_MAX_MAPPINGS) return grub_error (GRUB_ERR_BUG, "too many mapped areas"); grub_dprintf ("xen", "get_pgtable_size %d from=%llx, to=%llx, pfn=%llx\n", xen_state.n_mappings, (unsigned long long) from, (unsigned long long) to, (unsigned long long) pfn); map = xen_state.mappings + xen_state.n_mappings; grub_memset (map, 0, sizeof (*map)); map->area.virt_start = from & VIRT_MASK; map->area.virt_end = (to - 1) & VIRT_MASK; map->area.n_pt_pages = 0; for (i = NUMBER_OF_LEVELS - 1; i >= 0; i--) { map->lvls[i].pfn_start = pfn + map->area.n_pt_pages; if (i == NUMBER_OF_LEVELS - 1) { if (xen_state.n_mappings == 0) { map->lvls[i].virt_start = 0; map->lvls[i].virt_end = VIRT_MASK; map->lvls[i].n_pt_pages = 1; map->area.n_pt_pages++; } continue; } bits = PAGE_SHIFT + (i + 1) * LOG_POINTERS_PER_PAGE; mask = (1ULL << bits) - 1; map->lvls[i].virt_start = map->area.virt_start & ~mask; map->lvls[i].virt_end = map->area.virt_end | mask; #ifdef __i386__ /* PAE wants last root directory present. */ if (i == 1 && to <= HYPERVISOR_PUD_ADDRESS && xen_state.n_mappings == 0) map->lvls[i].virt_end = VIRT_MASK; #endif for (m = 0; m < xen_state.n_mappings; m++) { map_cmp = xen_state.mappings + m; if (map_cmp->lvls[i].virt_start == map_cmp->lvls[i].virt_end) continue; if (map->lvls[i].virt_start >= map_cmp->lvls[i].virt_start && map->lvls[i].virt_end <= map_cmp->lvls[i].virt_end) { map->lvls[i].virt_start = 0; map->lvls[i].virt_end = 0; break; } if (map->lvls[i].virt_start >= map_cmp->lvls[i].virt_start && map->lvls[i].virt_start <= map_cmp->lvls[i].virt_end) map->lvls[i].virt_start = map_cmp->lvls[i].virt_end + 1; if (map->lvls[i].virt_end >= map_cmp->lvls[i].virt_start && map->lvls[i].virt_end <= map_cmp->lvls[i].virt_end) map->lvls[i].virt_end = map_cmp->lvls[i].virt_start - 1; } if (map->lvls[i].virt_start < map->lvls[i].virt_end) map->lvls[i].n_pt_pages = ((map->lvls[i].virt_end - map->lvls[i].virt_start) >> bits) + 1; map->area.n_pt_pages += map->lvls[i].n_pt_pages; grub_dprintf ("xen", "get_pgtable_size level %d: virt %llx-%llx %d pts\n", i, (unsigned long long) map->lvls[i].virt_start, (unsigned long long) map->lvls[i].virt_end, (int) map->lvls[i].n_pt_pages); } grub_dprintf ("xen", "get_pgtable_size return: %d page tables\n", (int) map->area.n_pt_pages); xen_state.state.paging_start[xen_state.n_mappings] = pfn; xen_state.state.paging_size[xen_state.n_mappings] = map->area.n_pt_pages; return GRUB_ERR_NONE; } static grub_uint64_t * get_pg_table_virt (int mapping, int level) { grub_uint64_t pfn; struct grub_xen_mapping *map; map = xen_state.mappings + mapping; pfn = map->lvls[level].pfn_start - map->lvls[NUMBER_OF_LEVELS - 1].pfn_start; return map->where + pfn * POINTERS_PER_PAGE; } static grub_uint64_t get_pg_table_prot (int level, grub_uint64_t pfn) { int m; grub_uint64_t pfn_s, pfn_e; if (level > 0) return INTERMEDIATE_OR; for (m = 0; m < xen_state.n_mappings; m++) { pfn_s = xen_state.mappings[m].lvls[NUMBER_OF_LEVELS - 1].pfn_start; pfn_e = xen_state.mappings[m].area.n_pt_pages + pfn_s; if (pfn >= pfn_s && pfn < pfn_e) return GRUB_PAGE_PRESENT | GRUB_PAGE_USER; } return GRUB_PAGE_PRESENT | GRUB_PAGE_RW | GRUB_PAGE_USER; } static void generate_page_table (grub_xen_mfn_t *mfn_list) { int l, m1, m2; long p, p_s, p_e; grub_uint64_t start, end, pfn; grub_uint64_t *pg; struct grub_xen_mapping_lvl *lvl; for (m1 = 0; m1 < xen_state.n_mappings; m1++) grub_memset (xen_state.mappings[m1].where, 0, xen_state.mappings[m1].area.n_pt_pages * PAGE_SIZE); for (l = NUMBER_OF_LEVELS - 1; l >= 0; l--) { for (m1 = 0; m1 < xen_state.n_mappings; m1++) { start = xen_state.mappings[m1].lvls[l].virt_start; end = xen_state.mappings[m1].lvls[l].virt_end; pg = get_pg_table_virt(m1, l); for (m2 = 0; m2 < xen_state.n_mappings; m2++) { lvl = (l > 0) ? xen_state.mappings[m2].lvls + l - 1 : &xen_state.mappings[m2].area; if (l > 0 && lvl->n_pt_pages == 0) continue; if (lvl->virt_start >= end || lvl->virt_end <= start) continue; p_s = (grub_max (start, lvl->virt_start) - start) >> (PAGE_SHIFT + l * LOG_POINTERS_PER_PAGE); p_e = (grub_min (end, lvl->virt_end) - start) >> (PAGE_SHIFT + l * LOG_POINTERS_PER_PAGE); pfn = ((grub_max (start, lvl->virt_start) - lvl->virt_start) >> (PAGE_SHIFT + l * LOG_POINTERS_PER_PAGE)) + lvl->pfn_start; grub_dprintf ("xen", "write page table entries level %d pg %p " "mapping %d/%d index %lx-%lx pfn %llx\n", l, pg, m1, m2, p_s, p_e, (unsigned long long) pfn); for (p = p_s; p <= p_e; p++) { pg[p] = page2offset (mfn_list[pfn]) | get_pg_table_prot (l, pfn); pfn++; } } } } } static grub_err_t set_mfns (grub_xen_mfn_t pfn) { grub_xen_mfn_t i, t; grub_xen_mfn_t cn_pfn = -1, st_pfn = -1; struct mmu_update m2p_updates[4]; for (i = 0; i < grub_xen_start_page_addr->nr_pages; i++) { if (xen_state.virt_mfn_list[i] == grub_xen_start_page_addr->console.domU.mfn) cn_pfn = i; if (xen_state.virt_mfn_list[i] == grub_xen_start_page_addr->store_mfn) st_pfn = i; } if (cn_pfn == (grub_xen_mfn_t)-1) return grub_error (GRUB_ERR_BUG, "no console"); if (st_pfn == (grub_xen_mfn_t)-1) return grub_error (GRUB_ERR_BUG, "no store"); t = xen_state.virt_mfn_list[pfn]; xen_state.virt_mfn_list[pfn] = xen_state.virt_mfn_list[cn_pfn]; xen_state.virt_mfn_list[cn_pfn] = t; t = xen_state.virt_mfn_list[pfn + 1]; xen_state.virt_mfn_list[pfn + 1] = xen_state.virt_mfn_list[st_pfn]; xen_state.virt_mfn_list[st_pfn] = t; m2p_updates[0].ptr = page2offset (xen_state.virt_mfn_list[pfn]) | MMU_MACHPHYS_UPDATE; m2p_updates[0].val = pfn; m2p_updates[1].ptr = page2offset (xen_state.virt_mfn_list[pfn + 1]) | MMU_MACHPHYS_UPDATE; m2p_updates[1].val = pfn + 1; m2p_updates[2].ptr = page2offset (xen_state.virt_mfn_list[cn_pfn]) | MMU_MACHPHYS_UPDATE; m2p_updates[2].val = cn_pfn; m2p_updates[3].ptr = page2offset (xen_state.virt_mfn_list[st_pfn]) | MMU_MACHPHYS_UPDATE; m2p_updates[3].val = st_pfn; grub_xen_mmu_update (m2p_updates, 4, NULL, DOMID_SELF); return GRUB_ERR_NONE; } static grub_err_t grub_xen_p2m_alloc (void) { grub_relocator_chunk_t ch; grub_size_t p2msize, p2malloc; grub_err_t err; struct grub_xen_mapping *map; if (xen_state.virt_mfn_list) return GRUB_ERR_NONE; map = xen_state.mappings + xen_state.n_mappings; p2msize = ALIGN_UP (sizeof (grub_xen_mfn_t) * grub_xen_start_page_addr->nr_pages, PAGE_SIZE); if (xen_state.xen_inf.has_p2m_base) { err = get_pgtable_size (xen_state.xen_inf.p2m_base, xen_state.xen_inf.p2m_base + p2msize, (xen_state.max_addr + p2msize) >> PAGE_SHIFT); if (err) return err; map->area.pfn_start = xen_state.max_addr >> PAGE_SHIFT; p2malloc = p2msize + page2offset (map->area.n_pt_pages); xen_state.n_mappings++; xen_state.next_start.mfn_list = xen_state.xen_inf.p2m_base; xen_state.next_start.first_p2m_pfn = map->area.pfn_start; xen_state.next_start.nr_p2m_frames = p2malloc >> PAGE_SHIFT; } else { xen_state.next_start.mfn_list = xen_state.max_addr + xen_state.xen_inf.virt_base; p2malloc = p2msize; } xen_state.state.mfn_list = xen_state.max_addr; err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, xen_state.max_addr, p2malloc); if (err) return err; xen_state.virt_mfn_list = get_virtual_current_address (ch); if (xen_state.xen_inf.has_p2m_base) map->where = (grub_uint64_t *) xen_state.virt_mfn_list + p2msize / sizeof (grub_uint64_t); grub_memcpy (xen_state.virt_mfn_list, (void *) grub_xen_start_page_addr->mfn_list, p2msize); xen_state.max_addr += p2malloc; return GRUB_ERR_NONE; } static grub_err_t grub_xen_special_alloc (void) { grub_relocator_chunk_t ch; grub_err_t err; if (xen_state.virt_start_info) return GRUB_ERR_NONE; err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, xen_state.max_addr, sizeof (xen_state.next_start)); if (err) return err; xen_state.state.start_info = xen_state.max_addr + xen_state.xen_inf.virt_base; xen_state.virt_start_info = get_virtual_current_address (ch); xen_state.max_addr = ALIGN_UP (xen_state.max_addr + sizeof (xen_state.next_start), PAGE_SIZE); xen_state.console_pfn = xen_state.max_addr >> PAGE_SHIFT; xen_state.max_addr += 2 * PAGE_SIZE; xen_state.next_start.nr_pages = grub_xen_start_page_addr->nr_pages; grub_memcpy (xen_state.next_start.magic, grub_xen_start_page_addr->magic, sizeof (xen_state.next_start.magic)); xen_state.next_start.store_mfn = grub_xen_start_page_addr->store_mfn; xen_state.next_start.store_evtchn = grub_xen_start_page_addr->store_evtchn; xen_state.next_start.console.domU = grub_xen_start_page_addr->console.domU; xen_state.next_start.shared_info = grub_xen_start_page_addr->shared_info; return GRUB_ERR_NONE; } static grub_err_t grub_xen_pt_alloc (void) { grub_relocator_chunk_t ch; grub_err_t err; grub_uint64_t nr_info_pages; grub_uint64_t nr_need_pages; grub_uint64_t try_virt_end; struct grub_xen_mapping *map; if (xen_state.pgtbl_end) return GRUB_ERR_NONE; map = xen_state.mappings + xen_state.n_mappings; xen_state.map_reloc = map + 1; xen_state.next_start.pt_base = xen_state.max_addr + xen_state.xen_inf.virt_base; nr_info_pages = xen_state.max_addr >> PAGE_SHIFT; nr_need_pages = nr_info_pages; while (1) { try_virt_end = ALIGN_UP (xen_state.xen_inf.virt_base + page2offset (nr_need_pages) + ADDITIONAL_SIZE + STACK_SIZE, ALIGN_SIZE); err = get_pgtable_size (xen_state.xen_inf.virt_base, try_virt_end, nr_info_pages); if (err) return err; xen_state.n_mappings++; /* Map the relocator page either at virtual 0 or after end of area. */ nr_need_pages = nr_info_pages + map->area.n_pt_pages; if (xen_state.xen_inf.virt_base) err = get_pgtable_size (0, PAGE_SIZE, nr_need_pages); else err = get_pgtable_size (try_virt_end, try_virt_end + PAGE_SIZE, nr_need_pages); if (err) return err; nr_need_pages += xen_state.map_reloc->area.n_pt_pages; if (xen_state.xen_inf.virt_base + page2offset (nr_need_pages) <= try_virt_end) break; xen_state.n_mappings--; } xen_state.n_mappings++; nr_need_pages = map->area.n_pt_pages + xen_state.map_reloc->area.n_pt_pages; err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, xen_state.max_addr, page2offset (nr_need_pages)); if (err) return err; map->where = get_virtual_current_address (ch); map->area.pfn_start = 0; xen_state.max_addr += page2offset (nr_need_pages); xen_state.state.stack = xen_state.max_addr + STACK_SIZE + xen_state.xen_inf.virt_base; xen_state.next_start.nr_pt_frames = nr_need_pages; xen_state.max_addr = try_virt_end - xen_state.xen_inf.virt_base; xen_state.pgtbl_end = xen_state.max_addr >> PAGE_SHIFT; xen_state.map_reloc->where = (grub_uint64_t *) ((char *) map->where + page2offset (map->area.n_pt_pages)); return GRUB_ERR_NONE; } /* Allocate all not yet allocated areas mapped by initial page tables. */ static grub_err_t grub_xen_alloc_boot_data (void) { grub_err_t err; if (!xen_state.xen_inf.has_p2m_base) { err = grub_xen_p2m_alloc (); if (err) return err; } err = grub_xen_special_alloc (); if (err) return err; err = grub_xen_pt_alloc (); if (err) return err; return GRUB_ERR_NONE; } static grub_err_t grub_xen_boot (void) { grub_err_t err; grub_uint64_t nr_pages; struct gnttab_set_version gnttab_setver; grub_size_t i; if (grub_xen_n_allocated_shared_pages) return grub_error (GRUB_ERR_BUG, "active grants"); err = grub_xen_alloc_boot_data (); if (err) return err; if (xen_state.xen_inf.has_p2m_base) { err = grub_xen_p2m_alloc (); if (err) return err; } err = set_mfns (xen_state.console_pfn); if (err) return err; nr_pages = xen_state.max_addr >> PAGE_SHIFT; grub_dprintf ("xen", "bootstrap domain %llx+%llx\n", (unsigned long long) xen_state.xen_inf.virt_base, (unsigned long long) page2offset (nr_pages)); xen_state.map_reloc->area.pfn_start = nr_pages; generate_page_table (xen_state.virt_mfn_list); xen_state.state.entry_point = xen_state.xen_inf.entry_point; *xen_state.virt_start_info = xen_state.next_start; grub_memset (&gnttab_setver, 0, sizeof (gnttab_setver)); gnttab_setver.version = 1; grub_xen_grant_table_op (GNTTABOP_set_version, &gnttab_setver, 1); for (i = 0; i < ARRAY_SIZE (grub_xen_shared_info->evtchn_pending); i++) grub_xen_shared_info->evtchn_pending[i] = 0; return grub_relocator_xen_boot (xen_state.relocator, xen_state.state, nr_pages, xen_state.xen_inf.virt_base < PAGE_SIZE ? page2offset (nr_pages) : 0, xen_state.pgtbl_end - 1, page2offset (xen_state.pgtbl_end - 1) + xen_state.xen_inf.virt_base); } static void grub_xen_reset (void) { grub_relocator_unload (xen_state.relocator); grub_memset (&xen_state, 0, sizeof (xen_state)); } static grub_err_t grub_xen_unload (void) { grub_xen_reset (); grub_dl_unref (my_mod); return GRUB_ERR_NONE; } #define HYPERCALL_INTERFACE_SIZE 32 #ifdef __x86_64__ static grub_uint8_t template[] = { 0x51, /* push %rcx */ 0x41, 0x53, /* push %r11 */ 0x48, 0xc7, 0xc0, 0xbb, 0xaa, 0x00, 0x00, /* mov $0xaabb,%rax */ 0x0f, 0x05, /* syscall */ 0x41, 0x5b, /* pop %r11 */ 0x59, /* pop %rcx */ 0xc3 /* ret */ }; static grub_uint8_t template_iret[] = { 0x51, /* push %rcx */ 0x41, 0x53, /* push %r11 */ 0x50, /* push %rax */ 0x48, 0xc7, 0xc0, 0x17, 0x00, 0x00, 0x00, /* mov $0x17,%rax */ 0x0f, 0x05 /* syscall */ }; #define CALLNO_OFFSET 6 #else static grub_uint8_t template[] = { 0xb8, 0xbb, 0xaa, 0x00, 0x00, /* mov imm32, %eax */ 0xcd, 0x82, /* int $0x82 */ 0xc3 /* ret */ }; static grub_uint8_t template_iret[] = { 0x50, /* push %eax */ 0xb8, 0x17, 0x00, 0x00, 0x00, /* mov $0x17,%eax */ 0xcd, 0x82, /* int $0x82 */ }; #define CALLNO_OFFSET 1 #endif static void set_hypercall_interface (grub_uint8_t *tgt, unsigned callno) { if (callno == 0x17) { grub_memcpy (tgt, template_iret, ARRAY_SIZE (template_iret)); grub_memset (tgt + ARRAY_SIZE (template_iret), 0xcc, HYPERCALL_INTERFACE_SIZE - ARRAY_SIZE (template_iret)); return; } grub_memcpy (tgt, template, ARRAY_SIZE (template)); grub_memset (tgt + ARRAY_SIZE (template), 0xcc, HYPERCALL_INTERFACE_SIZE - ARRAY_SIZE (template)); tgt[CALLNO_OFFSET] = callno & 0xff; tgt[CALLNO_OFFSET + 1] = callno >> 8; } #ifdef __x86_64__ #define grub_elfXX_load grub_elf64_load #else #define grub_elfXX_load grub_elf32_load #endif static grub_err_t grub_cmd_xen (grub_command_t cmd __attribute__ ((unused)), int argc, char *argv[]) { grub_file_t file; grub_elf_t elf; grub_err_t err; void *kern_chunk_src; grub_relocator_chunk_t ch; grub_addr_t kern_start; grub_addr_t kern_end; grub_size_t sz; if (argc == 0) return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); /* Call grub_loader_unset early to avoid it being called by grub_loader_set */ grub_loader_unset (); grub_xen_reset (); err = grub_create_loader_cmdline (argc - 1, argv + 1, (char *) xen_state.next_start.cmd_line, sizeof (xen_state.next_start.cmd_line) - 1, GRUB_VERIFY_KERNEL_CMDLINE); if (err) return err; file = grub_file_open (argv[0], GRUB_FILE_TYPE_LINUX_KERNEL); if (!file) return grub_errno; elf = grub_xen_file (file); if (!elf) goto fail; err = grub_xen_get_info (elf, &xen_state.xen_inf); if (err) goto fail; #ifdef __x86_64__ if (xen_state.xen_inf.arch != GRUB_XEN_FILE_X86_64) #else if (xen_state.xen_inf.arch != GRUB_XEN_FILE_I386_PAE && xen_state.xen_inf.arch != GRUB_XEN_FILE_I386_PAE_BIMODE) #endif { grub_error (GRUB_ERR_BAD_OS, "incompatible architecture: %d", xen_state.xen_inf.arch); goto fail; } if (xen_state.xen_inf.virt_base & (PAGE_SIZE - 1)) { grub_error (GRUB_ERR_BAD_OS, "unaligned virt_base"); goto fail; } grub_dprintf ("xen", "virt_base = %llx, entry = %llx\n", (unsigned long long) xen_state.xen_inf.virt_base, (unsigned long long) xen_state.xen_inf.entry_point); xen_state.relocator = grub_relocator_new (); if (!xen_state.relocator) goto fail; kern_start = xen_state.xen_inf.kern_start - xen_state.xen_inf.paddr_offset; kern_end = xen_state.xen_inf.kern_end - xen_state.xen_inf.paddr_offset; if (xen_state.xen_inf.has_hypercall_page) { grub_dprintf ("xen", "hypercall page at 0x%llx\n", (unsigned long long) xen_state.xen_inf.hypercall_page); kern_start = grub_min (kern_start, xen_state.xen_inf.hypercall_page - xen_state.xen_inf.virt_base); kern_end = grub_max (kern_end, xen_state.xen_inf.hypercall_page - xen_state.xen_inf.virt_base + PAGE_SIZE); } xen_state.max_addr = ALIGN_UP (kern_end, PAGE_SIZE); if (grub_sub (kern_end, kern_start, &sz)) { err = GRUB_ERR_OUT_OF_RANGE; goto fail; } err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, kern_start, sz); if (err) goto fail; kern_chunk_src = get_virtual_current_address (ch); grub_dprintf ("xen", "paddr_offset = 0x%llx\n", (unsigned long long) xen_state.xen_inf.paddr_offset); grub_dprintf ("xen", "kern_start = 0x%llx, kern_end = 0x%llx\n", (unsigned long long) xen_state.xen_inf.kern_start, (unsigned long long) xen_state.xen_inf.kern_end); err = grub_elfXX_load (elf, argv[0], (grub_uint8_t *) kern_chunk_src - kern_start - xen_state.xen_inf.paddr_offset, 0, 0, 0); if (xen_state.xen_inf.has_hypercall_page) { unsigned i; for (i = 0; i < PAGE_SIZE / HYPERCALL_INTERFACE_SIZE; i++) set_hypercall_interface ((grub_uint8_t *) kern_chunk_src + i * HYPERCALL_INTERFACE_SIZE + xen_state.xen_inf.hypercall_page - xen_state.xen_inf.virt_base - kern_start, i); } if (err) goto fail; grub_dl_ref (my_mod); xen_state.loaded = 1; grub_loader_set (grub_xen_boot, grub_xen_unload, 0); goto fail; fail: /* grub_errno might be clobbered by further calls, save the error reason. */ err = grub_errno; if (elf) grub_elf_close (elf); else if (file) grub_file_close (file); if (err != GRUB_ERR_NONE) grub_xen_reset (); return err; } static grub_err_t grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), int argc, char *argv[]) { grub_size_t size = 0; grub_err_t err; struct grub_linux_initrd_context initrd_ctx = { 0, 0, 0 }; grub_relocator_chunk_t ch; if (argc == 0) { grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); goto fail; } if (!xen_state.loaded) { grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first")); goto fail; } if (xen_state.next_start.mod_start || xen_state.next_start.mod_len) { grub_error (GRUB_ERR_BAD_ARGUMENT, N_("initrd already loaded")); goto fail; } if (xen_state.xen_inf.unmapped_initrd) { err = grub_xen_alloc_boot_data (); if (err) goto fail; } if (grub_initrd_init (argc, argv, &initrd_ctx)) goto fail; size = grub_get_initrd_size (&initrd_ctx); if (size) { err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, xen_state.max_addr, size); if (err) goto fail; if (grub_initrd_load (&initrd_ctx, argv, get_virtual_current_address (ch))) goto fail; } xen_state.next_start.mod_len = size; if (xen_state.xen_inf.unmapped_initrd) { xen_state.next_start.flags |= SIF_MOD_START_PFN; xen_state.next_start.mod_start = xen_state.max_addr >> PAGE_SHIFT; } else xen_state.next_start.mod_start = xen_state.max_addr + xen_state.xen_inf.virt_base; grub_dprintf ("xen", "Initrd, addr=0x%x, size=0x%x\n", (unsigned) (xen_state.max_addr + xen_state.xen_inf.virt_base), (unsigned) size); xen_state.max_addr = ALIGN_UP (xen_state.max_addr + size, PAGE_SIZE); fail: grub_initrd_close (&initrd_ctx); return grub_errno; } static grub_err_t grub_cmd_module (grub_command_t cmd __attribute__ ((unused)), int argc, char *argv[]) { grub_size_t size = 0; grub_err_t err; grub_relocator_chunk_t ch; grub_size_t cmdline_len; int nounzip = 0; grub_file_t file; if (argc == 0) return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); if (grub_strcmp (argv[0], "--nounzip") == 0) { argv++; argc--; nounzip = 1; } if (argc == 0) return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); if (!xen_state.loaded) { return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first")); } if ((xen_state.next_start.mod_start || xen_state.next_start.mod_len) && !xen_state.module_info_page) { return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("initrd already loaded")); } /* Leave one space for terminator. */ if (xen_state.n_modules >= MAX_MODULES - 1) { return grub_error (GRUB_ERR_BAD_ARGUMENT, "too many modules"); } if (!xen_state.module_info_page) { xen_state.xen_inf.unmapped_initrd = 0; xen_state.n_modules = 0; xen_state.max_addr = ALIGN_UP (xen_state.max_addr, PAGE_SIZE); xen_state.modules_target_start = xen_state.max_addr; xen_state.next_start.mod_start = xen_state.max_addr + xen_state.xen_inf.virt_base; xen_state.next_start.flags |= SIF_MULTIBOOT_MOD; err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, xen_state.max_addr, MAX_MODULES * sizeof (xen_state.module_info_page [0])); if (err) return err; xen_state.module_info_page = get_virtual_current_address (ch); grub_memset (xen_state.module_info_page, 0, MAX_MODULES * sizeof (xen_state.module_info_page[0])); xen_state.max_addr += MAX_MODULES * sizeof (xen_state.module_info_page[0]); } xen_state.max_addr = ALIGN_UP (xen_state.max_addr, PAGE_SIZE); file = grub_file_open (argv[0], GRUB_FILE_TYPE_LINUX_INITRD | (nounzip ? GRUB_FILE_TYPE_NO_DECOMPRESS : GRUB_FILE_TYPE_NONE)); if (!file) return grub_errno; size = grub_file_size (file); cmdline_len = grub_loader_cmdline_size (argc - 1, argv + 1); err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, xen_state.max_addr, cmdline_len); if (err) goto fail; err = grub_create_loader_cmdline (argc - 1, argv + 1, get_virtual_current_address (ch), cmdline_len, GRUB_VERIFY_MODULE_CMDLINE); if (err) goto fail; xen_state.module_info_page[xen_state.n_modules].cmdline = xen_state.max_addr - xen_state.modules_target_start; xen_state.max_addr = ALIGN_UP (xen_state.max_addr + cmdline_len, PAGE_SIZE); if (size) { err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, xen_state.max_addr, size); if (err) goto fail; if (grub_file_read (file, get_virtual_current_address (ch), size) != (grub_ssize_t) size) { if (!grub_errno) grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"), argv[0]); goto fail; } } xen_state.next_start.mod_len = xen_state.max_addr + size - xen_state.modules_target_start; xen_state.module_info_page[xen_state.n_modules].mod_start = xen_state.max_addr - xen_state.modules_target_start; xen_state.module_info_page[xen_state.n_modules].mod_end = xen_state.max_addr + size - xen_state.modules_target_start; xen_state.n_modules++; grub_dprintf ("xen", "module, addr=0x%x, size=0x%x\n", (unsigned) xen_state.max_addr, (unsigned) size); xen_state.max_addr = ALIGN_UP (xen_state.max_addr + size, PAGE_SIZE); fail: grub_file_close (file); return grub_errno; } static grub_command_t cmd_xen, cmd_initrd, cmd_module, cmd_multiboot; GRUB_MOD_INIT (xen) { cmd_xen = grub_register_command ("linux", grub_cmd_xen, 0, N_("Load Linux.")); cmd_multiboot = grub_register_command ("multiboot", grub_cmd_xen, 0, N_("Load Linux.")); cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd, 0, N_("Load initrd.")); cmd_module = grub_register_command ("module", grub_cmd_module, 0, N_("Load module.")); my_mod = mod; } GRUB_MOD_FINI (xen) { grub_unregister_command (cmd_xen); grub_unregister_command (cmd_initrd); grub_unregister_command (cmd_multiboot); grub_unregister_command (cmd_module); }