diff options
Diffstat (limited to 'grub-core/loader/i386/xen.c')
| -rw-r--r-- | grub-core/loader/i386/xen.c | 986 |
1 files changed, 986 insertions, 0 deletions
diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c new file mode 100644 index 0000000..cd24874 --- /dev/null +++ b/grub-core/loader/i386/xen.c @@ -0,0 +1,986 @@ +/* + * 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 <http://www.gnu.org/licenses/>. + */ + +#include <grub/loader.h> +#include <grub/memory.h> +#include <grub/normal.h> +#include <grub/file.h> +#include <grub/disk.h> +#include <grub/err.h> +#include <grub/misc.h> +#include <grub/types.h> +#include <grub/dl.h> +#include <grub/mm.h> +#include <grub/term.h> +#include <grub/cpu/linux.h> +#include <grub/video.h> +#include <grub/video_fb.h> +#include <grub/command.h> +#include <grub/xen/relocator.h> +#include <grub/i18n.h> +#include <grub/elf.h> +#include <grub/elfload.h> +#include <grub/lib/cmdline.h> +#include <grub/xen.h> +#include <grub/xen_file.h> +#include <grub/linux.h> +#include <grub/i386/memory.h> +#include <grub/verify.h> +#include <grub/safemath.h> + +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); +} |