diff options
Diffstat (limited to 'grub-core/loader/i386/linux.c')
| -rw-r--r-- | grub-core/loader/i386/linux.c | 1141 |
1 files changed, 1141 insertions, 0 deletions
diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c new file mode 100644 index 0000000..9f74a96 --- /dev/null +++ b/grub-core/loader/i386/linux.c @@ -0,0 +1,1141 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2006,2007,2008,2009,2010 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/i386/relocator.h> +#include <grub/i18n.h> +#include <grub/lib/cmdline.h> +#include <grub/linux.h> +#include <grub/machine/kernel.h> +#include <grub/safemath.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +#ifdef GRUB_MACHINE_PCBIOS +#include <grub/i386/pc/vesa_modes_table.h> +#endif + +#ifdef GRUB_MACHINE_EFI +#include <grub/efi/efi.h> +#include <grub/efi/sb.h> +#define HAS_VGA_TEXT 0 +#define DEFAULT_VIDEO_MODE "auto" +#define ACCEPTS_PURE_TEXT 0 +#elif defined (GRUB_MACHINE_IEEE1275) +#include <grub/ieee1275/ieee1275.h> +#define HAS_VGA_TEXT 0 +#define DEFAULT_VIDEO_MODE "text" +#define ACCEPTS_PURE_TEXT 1 +#else +#include <grub/i386/pc/vbe.h> +#include <grub/i386/pc/console.h> +#define HAS_VGA_TEXT 1 +#define DEFAULT_VIDEO_MODE "text" +#define ACCEPTS_PURE_TEXT 1 +#endif + +static grub_dl_t my_mod; + +static grub_size_t linux_mem_size; +static int loaded; +static void *prot_mode_mem; +static grub_addr_t prot_mode_target; +static void *initrd_mem; +static grub_addr_t initrd_mem_target; +static grub_size_t prot_init_space; +static struct grub_relocator *relocator = NULL; +static void *efi_mmap_buf; +static grub_size_t maximal_cmdline_size; +static struct linux_kernel_params linux_params; +static char *linux_cmdline; +#ifdef GRUB_MACHINE_EFI +static grub_efi_uintn_t efi_mmap_size; +#else +static const grub_size_t efi_mmap_size = 0; +#endif + +/* FIXME */ +#if 0 +struct idt_descriptor +{ + grub_uint16_t limit; + void *base; +} GRUB_PACKED; + +static struct idt_descriptor idt_desc = + { + 0, + 0 + }; +#endif + +static inline grub_size_t +page_align (grub_size_t size) +{ + return (size + (1 << 12) - 1) & (~((1 << 12) - 1)); +} + +/* Helper for find_mmap_size. */ +static int +count_hook (grub_uint64_t addr __attribute__ ((unused)), + grub_uint64_t size __attribute__ ((unused)), + grub_memory_type_t type __attribute__ ((unused)), void *data) +{ + grub_size_t *count = data; + + (*count)++; + return 0; +} + +/* Find the optimal number of pages for the memory map. */ +static grub_size_t +find_mmap_size (void) +{ + grub_size_t count = 0, mmap_size; + + grub_mmap_iterate (count_hook, &count); + + mmap_size = count * sizeof (struct grub_e820_mmap); + + /* Increase the size a bit for safety, because GRUB allocates more on + later. */ + mmap_size += (1 << 12); + + return page_align (mmap_size); +} + +static void +free_pages (void) +{ + grub_relocator_unload (relocator); + relocator = NULL; + prot_mode_mem = initrd_mem = 0; + prot_mode_target = initrd_mem_target = 0; +} + +/* Allocate pages for the real mode code and the protected mode code + for linux as well as a memory map buffer. */ +static grub_err_t +allocate_pages (grub_size_t prot_size, grub_size_t *align, + grub_size_t min_align, int relocatable, + grub_uint64_t preferred_address) +{ + grub_err_t err; + + if (prot_size == 0) + prot_size = 1; + + prot_size = page_align (prot_size); + + /* Initialize the memory pointers with NULL for convenience. */ + free_pages (); + + relocator = grub_relocator_new (); + if (!relocator) + { + err = grub_errno; + goto fail; + } + + /* FIXME: Should request low memory from the heap when this feature is + implemented. */ + + { + grub_relocator_chunk_t ch; + if (relocatable) + { + err = grub_relocator_alloc_chunk_align (relocator, &ch, + preferred_address, + preferred_address, + prot_size, 1, + GRUB_RELOCATOR_PREFERENCE_LOW, + 1); + for (; err && *align + 1 > min_align; (*align)--) + { + grub_errno = GRUB_ERR_NONE; + err = grub_relocator_alloc_chunk_align (relocator, &ch, 0x1000000, + UP_TO_TOP32 (prot_size), + prot_size, 1 << *align, + GRUB_RELOCATOR_PREFERENCE_LOW, + 1); + } + if (err) + goto fail; + } + else + err = grub_relocator_alloc_chunk_addr (relocator, &ch, + preferred_address, + prot_size); + if (err) + goto fail; + prot_mode_mem = get_virtual_current_address (ch); + prot_mode_target = get_physical_target_address (ch); + } + + grub_dprintf ("linux", "prot_mode_mem = %p, prot_mode_target = %lx, prot_size = %x\n", + prot_mode_mem, (unsigned long) prot_mode_target, + (unsigned) prot_size); + return GRUB_ERR_NONE; + + fail: + free_pages (); + return err; +} + +static grub_err_t +grub_e820_add_region (struct grub_e820_mmap *e820_map, int *e820_num, + grub_uint64_t start, grub_uint64_t size, + grub_uint32_t type) +{ + int n = *e820_num; + + if ((n > 0) && (e820_map[n - 1].addr + e820_map[n - 1].size == start) && + (e820_map[n - 1].type == type)) + e820_map[n - 1].size += size; + else + { + e820_map[n].addr = start; + e820_map[n].size = size; + e820_map[n].type = type; + (*e820_num)++; + } + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_linux_setup_video (struct linux_kernel_params *params) +{ + struct grub_video_mode_info mode_info; + void *framebuffer; + grub_err_t err; + grub_video_driver_id_t driver_id; + const char *gfxlfbvar = grub_env_get ("gfxpayloadforcelfb"); + + driver_id = grub_video_get_driver_id (); + + if (driver_id == GRUB_VIDEO_DRIVER_NONE) + return 1; + + err = grub_video_get_info_and_fini (&mode_info, &framebuffer); + + if (err) + { + grub_errno = GRUB_ERR_NONE; + return 1; + } + + params->lfb_width = mode_info.width; + params->lfb_height = mode_info.height; + params->lfb_depth = mode_info.bpp; + params->lfb_line_len = mode_info.pitch; + + params->lfb_base = (grub_size_t) framebuffer; + +#if defined (GRUB_MACHINE_EFI) && defined (__x86_64__) + params->ext_lfb_base = (grub_size_t) (((grub_uint64_t)(grub_size_t) framebuffer) >> 32); + params->capabilities |= VIDEO_CAPABILITY_64BIT_BASE; +#endif + + params->lfb_size = ALIGN_UP (params->lfb_line_len * params->lfb_height, 65536); + + params->red_mask_size = mode_info.red_mask_size; + params->red_field_pos = mode_info.red_field_pos; + params->green_mask_size = mode_info.green_mask_size; + params->green_field_pos = mode_info.green_field_pos; + params->blue_mask_size = mode_info.blue_mask_size; + params->blue_field_pos = mode_info.blue_field_pos; + params->reserved_mask_size = mode_info.reserved_mask_size; + params->reserved_field_pos = mode_info.reserved_field_pos; + + if (gfxlfbvar && (gfxlfbvar[0] == '1' || gfxlfbvar[0] == 'y')) + params->have_vga = GRUB_VIDEO_LINUX_TYPE_SIMPLE; + else + { + switch (driver_id) + { + case GRUB_VIDEO_DRIVER_VBE: + params->lfb_size >>= 16; + params->have_vga = GRUB_VIDEO_LINUX_TYPE_VESA; + break; + + case GRUB_VIDEO_DRIVER_EFI_UGA: + case GRUB_VIDEO_DRIVER_EFI_GOP: + params->have_vga = GRUB_VIDEO_LINUX_TYPE_EFIFB; + break; + + /* FIXME: check if better id is available. */ + case GRUB_VIDEO_DRIVER_SM712: + case GRUB_VIDEO_DRIVER_SIS315PRO: + case GRUB_VIDEO_DRIVER_VGA: + case GRUB_VIDEO_DRIVER_CIRRUS: + case GRUB_VIDEO_DRIVER_BOCHS: + case GRUB_VIDEO_DRIVER_RADEON_FULOONG2E: + case GRUB_VIDEO_DRIVER_RADEON_YEELOONG3A: + case GRUB_VIDEO_DRIVER_IEEE1275: + case GRUB_VIDEO_DRIVER_COREBOOT: + /* Make gcc happy. */ + case GRUB_VIDEO_DRIVER_XEN: + case GRUB_VIDEO_DRIVER_SDL: + case GRUB_VIDEO_DRIVER_NONE: + case GRUB_VIDEO_ADAPTER_CAPTURE: + params->have_vga = GRUB_VIDEO_LINUX_TYPE_SIMPLE; + break; + } + } + +#ifdef GRUB_MACHINE_PCBIOS + /* VESA packed modes may come with zeroed mask sizes, which need + to be set here according to DAC Palette width. If we don't, + this results in Linux displaying a black screen. */ + if (driver_id == GRUB_VIDEO_DRIVER_VBE && mode_info.bpp <= 8) + { + struct grub_vbe_info_block controller_info; + int status; + int width = 8; + + status = grub_vbe_bios_get_controller_info (&controller_info); + + if (status == GRUB_VBE_STATUS_OK && + (controller_info.capabilities & GRUB_VBE_CAPABILITY_DACWIDTH)) + status = grub_vbe_bios_set_dac_palette_width (&width); + + if (status != GRUB_VBE_STATUS_OK) + /* 6 is default after mode reset. */ + width = 6; + + params->red_mask_size = params->green_mask_size + = params->blue_mask_size = width; + params->reserved_mask_size = 0; + } +#endif + + return GRUB_ERR_NONE; +} + +/* Context for grub_linux_boot. */ +struct grub_linux_boot_ctx +{ + grub_addr_t real_mode_target; + grub_size_t real_size; + struct linux_kernel_params *params; + int e820_num; +}; + +/* Helper for grub_linux_boot. */ +static int +grub_linux_boot_mmap_find (grub_uint64_t addr, grub_uint64_t size, + grub_memory_type_t type, void *data) +{ + struct grub_linux_boot_ctx *ctx = data; + + /* We must put real mode code in the traditional space. */ + if (type != GRUB_MEMORY_AVAILABLE || addr > 0x90000) + return 0; + + if (addr + size < 0x10000) + return 0; + + if (addr < 0x10000) + { + size += addr - 0x10000; + addr = 0x10000; + } + + if (addr + size > 0x90000) + size = 0x90000 - addr; + + if (ctx->real_size + efi_mmap_size > size) + return 0; + + grub_dprintf ("linux", "addr = %lx, size = %x, need_size = %x\n", + (unsigned long) addr, + (unsigned) size, + (unsigned) (ctx->real_size + efi_mmap_size)); + ctx->real_mode_target = ((addr + size) - (ctx->real_size + efi_mmap_size)); + return 1; +} + +/* GRUB types conveniently match E820 types. */ +static int +grub_linux_boot_mmap_fill (grub_uint64_t addr, grub_uint64_t size, + grub_memory_type_t type, void *data) +{ + struct grub_linux_boot_ctx *ctx = data; + + if (grub_e820_add_region (ctx->params->e820_map, &ctx->e820_num, + addr, size, type)) + return 1; + + return 0; +} + +static grub_err_t +grub_linux_boot (void) +{ + grub_err_t err = 0; + const char *modevar; + char *tmp; + struct grub_relocator32_state state; + void *real_mode_mem; + struct grub_linux_boot_ctx ctx = { + .real_mode_target = 0 + }; + grub_size_t mmap_size; + grub_size_t cl_offset; + +#ifdef GRUB_MACHINE_IEEE1275 + { + const char *bootpath; + grub_ssize_t len; + + bootpath = grub_env_get ("root"); + if (bootpath) + grub_ieee1275_set_property (grub_ieee1275_chosen, + "bootpath", bootpath, + grub_strlen (bootpath) + 1, + &len); + linux_params.ofw_signature = GRUB_LINUX_OFW_SIGNATURE; + linux_params.ofw_num_items = 1; + linux_params.ofw_cif_handler = (grub_uint32_t) grub_ieee1275_entry_fn; + linux_params.ofw_idt = 0; + } +#endif + + modevar = grub_env_get ("gfxpayload"); + + /* Now all graphical modes are acceptable. + May change in future if we have modes without framebuffer. */ + if (modevar && *modevar != 0) + { + tmp = grub_xasprintf ("%s;" DEFAULT_VIDEO_MODE, modevar); + if (! tmp) + return grub_errno; +#if ACCEPTS_PURE_TEXT + err = grub_video_set_mode (tmp, 0, 0); +#else + err = grub_video_set_mode (tmp, GRUB_VIDEO_MODE_TYPE_PURE_TEXT, 0); +#endif + grub_free (tmp); + } + else /* We can't go back to text mode from coreboot fb. */ +#ifdef GRUB_MACHINE_COREBOOT + if (grub_video_get_driver_id () == GRUB_VIDEO_DRIVER_COREBOOT) + err = GRUB_ERR_NONE; + else +#endif + { +#if ACCEPTS_PURE_TEXT + err = grub_video_set_mode (DEFAULT_VIDEO_MODE, 0, 0); +#else + err = grub_video_set_mode (DEFAULT_VIDEO_MODE, + GRUB_VIDEO_MODE_TYPE_PURE_TEXT, 0); +#endif + } + + if (err) + { + grub_print_error (); + grub_puts_ (N_("Booting in blind mode")); + grub_errno = GRUB_ERR_NONE; + } + + if (grub_linux_setup_video (&linux_params)) + { +#if defined (GRUB_MACHINE_PCBIOS) || defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_QEMU) + linux_params.have_vga = GRUB_VIDEO_LINUX_TYPE_TEXT; + linux_params.video_mode = 0x3; +#else + linux_params.have_vga = 0; + linux_params.video_mode = 0; + linux_params.video_width = 0; + linux_params.video_height = 0; +#endif + } + + +#ifndef GRUB_MACHINE_IEEE1275 + if (linux_params.have_vga == GRUB_VIDEO_LINUX_TYPE_TEXT) +#endif + { + grub_term_output_t term; + int found = 0; + FOR_ACTIVE_TERM_OUTPUTS(term) + if (grub_strcmp (term->name, "vga_text") == 0 + || grub_strcmp (term->name, "console") == 0 + || grub_strcmp (term->name, "ofconsole") == 0) + { + struct grub_term_coordinate pos = grub_term_getxy (term); + linux_params.video_cursor_x = pos.x; + linux_params.video_cursor_y = pos.y; + linux_params.video_width = grub_term_width (term); + linux_params.video_height = grub_term_height (term); + found = 1; + break; + } + if (!found) + { + linux_params.video_cursor_x = 0; + linux_params.video_cursor_y = 0; + linux_params.video_width = 80; + linux_params.video_height = 25; + } + } + +#ifdef GRUB_KERNEL_USE_RSDP_ADDR + linux_params.acpi_rsdp_addr = grub_le_to_cpu64 (grub_rsdp_addr); +#endif + + mmap_size = find_mmap_size (); + /* Make sure that each size is aligned to a page boundary. */ + cl_offset = ALIGN_UP (mmap_size + sizeof (linux_params), 4096); + if (cl_offset < ((grub_size_t) linux_params.setup_sects << GRUB_DISK_SECTOR_BITS)) + cl_offset = ALIGN_UP ((grub_size_t) (linux_params.setup_sects + << GRUB_DISK_SECTOR_BITS), 4096); + ctx.real_size = ALIGN_UP (cl_offset + maximal_cmdline_size, 4096); + +#ifdef GRUB_MACHINE_EFI + efi_mmap_size = grub_efi_find_mmap_size (); + if (efi_mmap_size == 0) + return grub_errno; +#endif + + grub_dprintf ("linux", "real_size = %x, mmap_size = %x\n", + (unsigned) ctx.real_size, (unsigned) mmap_size); + +#ifdef GRUB_MACHINE_EFI + grub_efi_mmap_iterate (grub_linux_boot_mmap_find, &ctx, 1); + if (! ctx.real_mode_target) + grub_efi_mmap_iterate (grub_linux_boot_mmap_find, &ctx, 0); +#else + grub_mmap_iterate (grub_linux_boot_mmap_find, &ctx); +#endif + grub_dprintf ("linux", "real_mode_target = %lx, real_size = %x, efi_mmap_size = %x\n", + (unsigned long) ctx.real_mode_target, + (unsigned) ctx.real_size, + (unsigned) efi_mmap_size); + + if (! ctx.real_mode_target) + return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate real mode pages"); + + { + grub_relocator_chunk_t ch; + grub_size_t sz; + + if (grub_add (ctx.real_size, efi_mmap_size, &sz)) + return GRUB_ERR_OUT_OF_RANGE; + + err = grub_relocator_alloc_chunk_addr (relocator, &ch, + ctx.real_mode_target, sz); + if (err) + return err; + real_mode_mem = get_virtual_current_address (ch); + } + efi_mmap_buf = (grub_uint8_t *) real_mode_mem + ctx.real_size; + + grub_dprintf ("linux", "real_mode_mem = %p\n", + real_mode_mem); + + ctx.params = real_mode_mem; + + *ctx.params = linux_params; + ctx.params->cmd_line_ptr = ctx.real_mode_target + cl_offset; + grub_memcpy ((char *) ctx.params + cl_offset, linux_cmdline, + maximal_cmdline_size); + + grub_dprintf ("linux", "code32_start = %x\n", + (unsigned) ctx.params->code32_start); + + ctx.e820_num = 0; + if (grub_mmap_iterate (grub_linux_boot_mmap_fill, &ctx)) + return grub_errno; + ctx.params->mmap_size = ctx.e820_num; + +#ifdef GRUB_MACHINE_EFI + { + grub_efi_uintn_t efi_desc_size; + grub_size_t efi_mmap_target; + grub_efi_uint32_t efi_desc_version; + + ctx.params->secure_boot = grub_efi_get_secureboot (); + + err = grub_efi_finish_boot_services (&efi_mmap_size, efi_mmap_buf, NULL, + &efi_desc_size, &efi_desc_version); + if (err) + return err; + + /* Note that no boot services are available from here. */ + efi_mmap_target = ctx.real_mode_target + + ((grub_uint8_t *) efi_mmap_buf - (grub_uint8_t *) real_mode_mem); + /* Pass EFI parameters. */ + if (grub_le_to_cpu16 (ctx.params->version) >= 0x0208) + { + ctx.params->v0208.efi_mem_desc_size = efi_desc_size; + ctx.params->v0208.efi_mem_desc_version = efi_desc_version; + ctx.params->v0208.efi_mmap = efi_mmap_target; + ctx.params->v0208.efi_mmap_size = efi_mmap_size; + +#ifdef __x86_64__ + ctx.params->v0208.efi_mmap_hi = (efi_mmap_target >> 32); +#endif + } + else if (grub_le_to_cpu16 (ctx.params->version) >= 0x0206) + { + ctx.params->v0206.efi_mem_desc_size = efi_desc_size; + ctx.params->v0206.efi_mem_desc_version = efi_desc_version; + ctx.params->v0206.efi_mmap = efi_mmap_target; + ctx.params->v0206.efi_mmap_size = efi_mmap_size; + } + else if (grub_le_to_cpu16 (ctx.params->version) >= 0x0204) + { + ctx.params->v0204.efi_mem_desc_size = efi_desc_size; + ctx.params->v0204.efi_mem_desc_version = efi_desc_version; + ctx.params->v0204.efi_mmap = efi_mmap_target; + ctx.params->v0204.efi_mmap_size = efi_mmap_size; + } + } +#endif + + /* FIXME. */ + /* asm volatile ("lidt %0" : : "m" (idt_desc)); */ + state.ebp = state.edi = state.ebx = 0; + state.esi = ctx.real_mode_target; + state.esp = ctx.real_mode_target; + state.eip = ctx.params->code32_start; + return grub_relocator32_boot (relocator, state, 0); +} + +static grub_err_t +grub_linux_unload (void) +{ + grub_dl_unref (my_mod); + loaded = 0; + grub_free (linux_cmdline); + linux_cmdline = 0; + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_file_t file = 0; + struct linux_i386_kernel_header lh; + grub_uint8_t setup_sects; + grub_size_t real_size, prot_size, prot_file_size; + grub_ssize_t len; + int i; + grub_size_t align, min_align; + int relocatable; + grub_uint64_t preferred_address = GRUB_LINUX_BZIMAGE_ADDR; + + grub_dl_ref (my_mod); + + if (argc == 0) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto fail; + } + + file = grub_file_open (argv[0], GRUB_FILE_TYPE_LINUX_KERNEL); + if (! file) + goto fail; + + if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh)) + { + if (!grub_errno) + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), + argv[0]); + goto fail; + } + + if (lh.boot_flag != grub_cpu_to_le16_compile_time (0xaa55)) + { + grub_error (GRUB_ERR_BAD_OS, "invalid magic number"); + goto fail; + } + + if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS) + { + grub_error (GRUB_ERR_BAD_OS, "too many setup sectors"); + goto fail; + } + + /* FIXME: 2.03 is not always good enough (Linux 2.4 can be 2.03 and + still not support 32-bit boot. */ + if (lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE) + || grub_le_to_cpu16 (lh.version) < 0x0203) + { + grub_error (GRUB_ERR_BAD_OS, "version too old for 32-bit boot" +#ifdef GRUB_MACHINE_PCBIOS + " (try with `linux16')" +#endif + ); + goto fail; + } + + if (! (lh.loadflags & GRUB_LINUX_FLAG_BIG_KERNEL)) + { + grub_error (GRUB_ERR_BAD_OS, "zImage doesn't support 32-bit boot" +#ifdef GRUB_MACHINE_PCBIOS + " (try with `linux16')" +#endif + ); + goto fail; + } + + if (grub_le_to_cpu16 (lh.version) >= 0x0206) + maximal_cmdline_size = grub_le_to_cpu32 (lh.cmdline_size) + 1; + else + maximal_cmdline_size = 256; + + if (maximal_cmdline_size < 128) + maximal_cmdline_size = 128; + + setup_sects = lh.setup_sects; + + /* If SETUP_SECTS is not set, set it to the default (4). */ + if (! setup_sects) + setup_sects = GRUB_LINUX_DEFAULT_SETUP_SECTS; + + real_size = setup_sects << GRUB_DISK_SECTOR_BITS; + prot_file_size = grub_file_size (file) - real_size - GRUB_DISK_SECTOR_SIZE; + + if (grub_le_to_cpu16 (lh.version) >= 0x205 + && lh.kernel_alignment != 0 + && ((lh.kernel_alignment - 1) & lh.kernel_alignment) == 0) + { + for (align = 0; align < 32; align++) + if (grub_le_to_cpu32 (lh.kernel_alignment) & (1 << align)) + break; + relocatable = lh.relocatable; + } + else + { + align = 0; + relocatable = 0; + } + + if (grub_le_to_cpu16 (lh.version) >= 0x020a) + { + min_align = lh.min_alignment; + prot_size = grub_le_to_cpu32 (lh.init_size); + prot_init_space = page_align (prot_size); + if (relocatable) + preferred_address = grub_le_to_cpu64 (lh.pref_address); + } + else + { + min_align = align; + prot_size = prot_file_size; + /* Usually, the compression ratio is about 50%. */ + prot_init_space = page_align (prot_size) * 3; + } + + if (allocate_pages (prot_size, &align, + min_align, relocatable, + preferred_address)) + goto fail; + + grub_memset (&linux_params, 0, sizeof (linux_params)); + + /* + * The Linux 32-bit boot protocol defines the setup header end + * to be at 0x202 + the byte value at 0x201. + */ + len = 0x202 + *((char *) &lh.jump + 1); + + /* Verify the struct is big enough so we do not write past the end. */ + if (len > (char *) &linux_params.edd_mbr_sig_buffer - (char *) &linux_params) { + grub_error (GRUB_ERR_BAD_OS, "Linux setup header too big"); + goto fail; + } + + grub_memcpy (&linux_params.setup_sects, &lh.setup_sects, len - 0x1F1); + + /* We've already read lh so there is no need to read it second time. */ + len -= sizeof(lh); + + if ((len > 0) && + (grub_file_read (file, (char *) &linux_params + sizeof (lh), len) != len)) + { + if (!grub_errno) + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), + argv[0]); + goto fail; + } + + linux_params.code32_start = prot_mode_target + lh.code32_start - GRUB_LINUX_BZIMAGE_ADDR; + linux_params.kernel_alignment = (1 << align); + linux_params.ps_mouse = linux_params.padding11 = 0; + linux_params.type_of_loader = GRUB_LINUX_BOOT_LOADER_TYPE; + + /* These two are used (instead of cmd_line_ptr) by older versions of Linux, + and otherwise ignored. */ + linux_params.cl_magic = GRUB_LINUX_CL_MAGIC; + linux_params.cl_offset = 0x1000; + + linux_params.ramdisk_image = 0; + linux_params.ramdisk_size = 0; + + linux_params.heap_end_ptr = GRUB_LINUX_HEAP_END_OFFSET; + linux_params.loadflags |= GRUB_LINUX_FLAG_CAN_USE_HEAP; + + /* These are not needed to be precise, because Linux uses these values + only to raise an error when the decompression code cannot find good + space. */ + linux_params.ext_mem = ((32 * 0x100000) >> 10); + linux_params.alt_mem = ((32 * 0x100000) >> 10); + + /* Ignored by Linux. */ + linux_params.video_page = 0; + + /* Only used when `video_mode == 0x7', otherwise ignored. */ + linux_params.video_ega_bx = 0; + + linux_params.font_size = 16; /* XXX */ + +#ifdef GRUB_MACHINE_EFI +#ifdef __x86_64__ + if (grub_le_to_cpu16 (linux_params.version) < 0x0208 && + ((grub_addr_t) grub_efi_system_table >> 32) != 0) + return grub_error(GRUB_ERR_BAD_OS, + "kernel does not support 64-bit addressing"); +#endif + + if (grub_le_to_cpu16 (linux_params.version) >= 0x0208) + { + linux_params.v0208.efi_signature = GRUB_LINUX_EFI_SIGNATURE; + linux_params.v0208.efi_system_table = (grub_uint32_t) (grub_addr_t) grub_efi_system_table; +#ifdef __x86_64__ + linux_params.v0208.efi_system_table_hi = (grub_uint32_t) ((grub_uint64_t) grub_efi_system_table >> 32); +#endif + } + else if (grub_le_to_cpu16 (linux_params.version) >= 0x0206) + { + linux_params.v0206.efi_signature = GRUB_LINUX_EFI_SIGNATURE; + linux_params.v0206.efi_system_table = (grub_uint32_t) (grub_addr_t) grub_efi_system_table; + } + else if (grub_le_to_cpu16 (linux_params.version) >= 0x0204) + { + linux_params.v0204.efi_signature = GRUB_LINUX_EFI_SIGNATURE_0204; + linux_params.v0204.efi_system_table = (grub_uint32_t) (grub_addr_t) grub_efi_system_table; + } +#endif + + /* The other parameters are filled when booting. */ + + grub_file_seek (file, real_size + GRUB_DISK_SECTOR_SIZE); + + grub_dprintf ("linux", "bzImage, setup=0x%x, size=0x%x\n", + (unsigned) real_size, (unsigned) prot_size); + + /* Look for memory size and video mode specified on the command line. */ + linux_mem_size = 0; + for (i = 1; i < argc; i++) +#ifdef GRUB_MACHINE_PCBIOS + if (grub_memcmp (argv[i], "vga=", 4) == 0) + { + /* Video mode selection support. */ + char *val = argv[i] + 4; + unsigned vid_mode = GRUB_LINUX_VID_MODE_NORMAL; + struct grub_vesa_mode_table_entry *linux_mode; + grub_err_t err; + char *buf; + + grub_dl_load ("vbe"); + + if (grub_strcmp (val, "normal") == 0) + vid_mode = GRUB_LINUX_VID_MODE_NORMAL; + else if (grub_strcmp (val, "ext") == 0) + vid_mode = GRUB_LINUX_VID_MODE_EXTENDED; + else if (grub_strcmp (val, "ask") == 0) + { + grub_puts_ (N_("Legacy `ask' parameter no longer supported.")); + + /* We usually would never do this in a loader, but "vga=ask" means user + requested interaction, so it can't hurt to request keyboard input. */ + grub_wait_after_message (); + + goto fail; + } + else + vid_mode = (grub_uint16_t) grub_strtoul (val, 0, 0); + + switch (vid_mode) + { + case 0: + case GRUB_LINUX_VID_MODE_NORMAL: + grub_env_set ("gfxpayload", "text"); + grub_printf_ (N_("%s is deprecated. " + "Use set gfxpayload=%s before " + "linux command instead.\n"), + argv[i], "text"); + break; + + case 1: + case GRUB_LINUX_VID_MODE_EXTENDED: + /* FIXME: support 80x50 text. */ + grub_env_set ("gfxpayload", "text"); + grub_printf_ (N_("%s is deprecated. " + "Use set gfxpayload=%s before " + "linux command instead.\n"), + argv[i], "text"); + break; + default: + /* Ignore invalid values. */ + if (vid_mode < GRUB_VESA_MODE_TABLE_START || + vid_mode > GRUB_VESA_MODE_TABLE_END) + { + grub_env_set ("gfxpayload", "text"); + /* TRANSLATORS: "x" has to be entered in, like an identifier, + so please don't use better Unicode codepoints. */ + grub_printf_ (N_("%s is deprecated. VGA mode %d isn't recognized. " + "Use set gfxpayload=WIDTHxHEIGHT[xDEPTH] " + "before linux command instead.\n"), + argv[i], vid_mode); + break; + } + + linux_mode = &grub_vesa_mode_table[vid_mode + - GRUB_VESA_MODE_TABLE_START]; + + buf = grub_xasprintf ("%ux%ux%u,%ux%u", + linux_mode->width, linux_mode->height, + linux_mode->depth, + linux_mode->width, linux_mode->height); + if (! buf) + goto fail; + + grub_printf_ (N_("%s is deprecated. " + "Use set gfxpayload=%s before " + "linux command instead.\n"), + argv[i], buf); + err = grub_env_set ("gfxpayload", buf); + grub_free (buf); + if (err) + goto fail; + } + } + else +#endif /* GRUB_MACHINE_PCBIOS */ + if (grub_memcmp (argv[i], "mem=", 4) == 0) + { + const char *val = argv[i] + 4; + + linux_mem_size = grub_strtoul (val, &val, 0); + + if (grub_errno) + { + grub_errno = GRUB_ERR_NONE; + linux_mem_size = 0; + } + else + { + int shift = 0; + + switch (grub_tolower (val[0])) + { + case 'g': + shift += 10; + /* FALLTHROUGH */ + case 'm': + shift += 10; + /* FALLTHROUGH */ + case 'k': + shift += 10; + /* FALLTHROUGH */ + default: + break; + } + + /* Check an overflow. */ + if (linux_mem_size > (~0UL >> shift)) + linux_mem_size = 0; + else + linux_mem_size <<= shift; + } + } + else if (grub_memcmp (argv[i], "quiet", sizeof ("quiet") - 1) == 0) + { + linux_params.loadflags |= GRUB_LINUX_FLAG_QUIET; + } + + /* Create kernel command line. */ + linux_cmdline = grub_zalloc (maximal_cmdline_size + 1); + if (!linux_cmdline) + goto fail; + grub_memcpy (linux_cmdline, LINUX_IMAGE, sizeof (LINUX_IMAGE)); + { + grub_err_t err; + err = grub_create_loader_cmdline (argc, argv, + linux_cmdline + + sizeof (LINUX_IMAGE) - 1, + maximal_cmdline_size + - (sizeof (LINUX_IMAGE) - 1), + GRUB_VERIFY_KERNEL_CMDLINE); + if (err) + goto fail; + } + + len = prot_file_size; + if (grub_file_read (file, prot_mode_mem, len) != len && !grub_errno) + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), + argv[0]); + + if (grub_errno == GRUB_ERR_NONE) + { + grub_loader_set (grub_linux_boot, grub_linux_unload, + 0 /* set noreturn=0 in order to avoid grub_console_fini() */); + loaded = 1; + } + + fail: + + if (file) + grub_file_close (file); + + if (grub_errno != GRUB_ERR_NONE) + { + grub_dl_unref (my_mod); + loaded = 0; + } + + return grub_errno; +} + +static grub_err_t +grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_size_t size = 0, aligned_size = 0; + grub_addr_t addr_min, addr_max; + grub_addr_t addr; + grub_err_t err; + struct grub_linux_initrd_context initrd_ctx = { 0, 0, 0 }; + + if (argc == 0) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + goto fail; + } + + if (! loaded) + { + grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first")); + goto fail; + } + + if (grub_initrd_init (argc, argv, &initrd_ctx)) + goto fail; + + size = grub_get_initrd_size (&initrd_ctx); + aligned_size = ALIGN_UP (size, 4096); + + /* Get the highest address available for the initrd. */ + if (grub_le_to_cpu16 (linux_params.version) >= 0x0203) + { + addr_max = grub_cpu_to_le32 (linux_params.initrd_addr_max); + + /* XXX in reality, Linux specifies a bogus value, so + it is necessary to make sure that ADDR_MAX does not exceed + 0x3fffffff. */ + if (addr_max > GRUB_LINUX_INITRD_MAX_ADDRESS) + addr_max = GRUB_LINUX_INITRD_MAX_ADDRESS; + } + else + addr_max = GRUB_LINUX_INITRD_MAX_ADDRESS; + + if (linux_mem_size != 0 && linux_mem_size < addr_max) + addr_max = linux_mem_size; + + /* Linux 2.3.xx has a bug in the memory range check, so avoid + the last page. + Linux 2.2.xx has a bug in the memory range check, which is + worse than that of Linux 2.3.xx, so avoid the last 64kb. */ + addr_max -= 0x10000; + + addr_min = (grub_addr_t) prot_mode_target + prot_init_space; + + /* Put the initrd as high as possible, 4KiB aligned. */ + addr = (addr_max - aligned_size) & ~0xFFF; + + if (addr < addr_min) + { + grub_error (GRUB_ERR_OUT_OF_RANGE, "the initrd is too big"); + goto fail; + } + + { + grub_relocator_chunk_t ch; + err = grub_relocator_alloc_chunk_align (relocator, &ch, + addr_min, addr, aligned_size, + 0x1000, + GRUB_RELOCATOR_PREFERENCE_HIGH, + 1); + if (err) + return err; + initrd_mem = get_virtual_current_address (ch); + initrd_mem_target = get_physical_target_address (ch); + } + + if (grub_initrd_load (&initrd_ctx, argv, initrd_mem)) + goto fail; + + grub_dprintf ("linux", "Initrd, addr=0x%x, size=0x%x\n", + (unsigned) addr, (unsigned) size); + + linux_params.ramdisk_image = initrd_mem_target; + linux_params.ramdisk_size = size; + linux_params.root_dev = 0x0100; /* XXX */ + + fail: + grub_initrd_close (&initrd_ctx); + + return grub_errno; +} + +static grub_command_t cmd_linux, cmd_initrd; + +GRUB_MOD_INIT(linux) +{ + cmd_linux = grub_register_command ("linux", grub_cmd_linux, + 0, N_("Load Linux.")); + cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd, + 0, N_("Load initrd.")); + my_mod = mod; +} + +GRUB_MOD_FINI(linux) +{ + grub_unregister_command (cmd_linux); + grub_unregister_command (cmd_initrd); +} |