/* * 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 . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define GRUB_LINUX_CL_OFFSET 0x1000 #define GRUB_LINUX_CL_END_OFFSET 0x2000 static grub_dl_t my_mod; static grub_size_t linux_mem_size; static int loaded; static void *real_mode_mem; static void *prot_mode_mem; static void *initrd_mem; static grub_uint32_t real_mode_pages; static grub_uint32_t prot_mode_pages; static grub_uint32_t initrd_pages; static grub_uint8_t gdt[] __attribute__ ((aligned(16))) = { /* NULL. */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* Reserved. */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* Code segment. */ 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x9A, 0xCF, 0x00, /* Data segment. */ 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x92, 0xCF, 0x00 }; struct gdt_descriptor { grub_uint16_t limit; void *base; } __attribute__ ((packed)); static struct gdt_descriptor gdt_desc = { sizeof (gdt) - 1, gdt }; struct idt_descriptor { grub_uint16_t limit; void *base; } __attribute__ ((packed)); static struct idt_descriptor idt_desc = { 0, 0 }; #ifdef GRUB_MACHINE_PCBIOS struct linux_vesafb_res { grub_uint16_t width; grub_uint16_t height; }; struct linux_vesafb_mode { grub_uint8_t res_index; grub_uint8_t depth; }; enum vga_modes { VGA_320_200, VGA_640_400, VGA_640_480, VGA_800_500, VGA_800_600, VGA_896_672, VGA_1024_640, VGA_1024_768, VGA_1152_720, VGA_1280_1024, VGA_1440_900, VGA_1600_1200, }; static struct linux_vesafb_res linux_vesafb_res[] = { { 320, 200 }, { 640, 400 }, { 640, 480 }, { 800, 500 }, { 800, 600 }, { 896, 672 }, { 1024, 640 }, { 1024, 768 }, { 1152, 720 }, { 1280, 1024 }, { 1440, 900 }, { 1600, 1200 }, }; /* This is the reverse of the table in [linux]/Documentation/fb/vesafb.txt plus a few more modes based on the table in http://en.wikipedia.org/wiki/VESA_BIOS_Extensions */ struct linux_vesafb_mode linux_vesafb_modes[] = { { VGA_640_400, 8 }, /* 0x300 */ { VGA_640_480, 8 }, /* 0x301 */ { VGA_800_600, 4 }, /* 0x302 */ { VGA_800_600, 8 }, /* 0x303 */ { VGA_1024_768, 4 }, /* 0x304 */ { VGA_1024_768, 8 }, /* 0x305 */ { VGA_1280_1024, 4 }, /* 0x306 */ { VGA_1280_1024, 8 }, /* 0x307 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { VGA_320_200, 15 }, /* 0x30d */ { VGA_320_200, 16 }, /* 0x30e */ { VGA_320_200, 24 }, /* 0x30f */ { VGA_640_480, 15 }, /* 0x310 */ { VGA_640_480, 16 }, /* 0x311 */ { VGA_640_480, 24 }, /* 0x312 */ { VGA_800_600, 15 }, /* 0x313 */ { VGA_800_600, 16 }, /* 0x314 */ { VGA_800_600, 24 }, /* 0x315 */ { VGA_1024_768, 15 }, /* 0x316 */ { VGA_1024_768, 16 }, /* 0x317 */ { VGA_1024_768, 24 }, /* 0x318 */ { VGA_1280_1024, 15 }, /* 0x319 */ { VGA_1280_1024, 16 }, /* 0x31a */ { VGA_1280_1024, 24 }, /* 0x31b */ { VGA_1600_1200, 8 }, /* 0x31c */ { VGA_1600_1200, 15 }, /* 0x31d */ { VGA_1600_1200, 16 }, /* 0x31e */ { VGA_1600_1200, 24 }, /* 0x31f */ { 0, 0 }, { VGA_640_400, 15 }, /* 0x321 */ { VGA_640_400, 16 }, /* 0x322 */ { VGA_640_400, 24 }, /* 0x323 */ { VGA_640_400, 32 }, /* 0x324 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { VGA_640_480, 32 }, /* 0x329 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { VGA_896_672, 8 }, /* 0x32f */ { VGA_896_672, 15 }, /* 0x330 */ { VGA_896_672, 16 }, /* 0x331 */ { VGA_896_672, 24 }, /* 0x332 */ { VGA_896_672, 32 }, /* 0x333 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { VGA_1600_1200, 32 }, /* 0x342 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { VGA_1440_900, 8 }, /* 0x360 */ { VGA_1440_900, 15 }, /* 0x361 */ { VGA_1440_900, 16 }, /* 0x362 */ { VGA_1440_900, 24 }, /* 0x363 */ { VGA_1440_900, 32 }, /* 0x364 */ { VGA_1152_720, 8 }, /* 0x365 */ { VGA_1152_720, 15 }, /* 0x366 */ { VGA_1152_720, 16 }, /* 0x367 */ { VGA_1152_720, 24 }, /* 0x368 */ { VGA_1152_720, 32 }, /* 0x369 */ { VGA_1024_640, 8 }, /* 0x36a */ { VGA_1024_640, 15 }, /* 0x36b */ { VGA_1024_640, 16 }, /* 0x36c */ { VGA_1024_640, 24 }, /* 0x36d */ { VGA_1024_640, 32 }, /* 0x36e */ { VGA_800_500, 8 }, /* 0x36f */ { VGA_800_500, 15 }, /* 0x370 */ { VGA_800_500, 16 }, /* 0x371 */ { VGA_800_500, 24 }, /* 0x372 */ { VGA_800_500, 32 }, /* 0x373 */ }; #endif static inline grub_size_t page_align (grub_size_t size) { return (size + (1 << 12) - 1) & (~((1 << 12) - 1)); } /* 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; auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t); int NESTED_FUNC_ATTR hook (grub_uint64_t addr __attribute__ ((unused)), grub_uint64_t size __attribute__ ((unused)), grub_uint32_t type __attribute__ ((unused))) { count++; return 0; } grub_mmap_iterate (hook); 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) { real_mode_mem = prot_mode_mem = initrd_mem = 0; } /* Allocate pages for the real mode code and the protected mode code for linux as well as a memory map buffer. */ static int allocate_pages (grub_size_t prot_size) { grub_size_t real_size, mmap_size; /* Make sure that each size is aligned to a page boundary. */ real_size = GRUB_LINUX_CL_END_OFFSET; prot_size = page_align (prot_size); mmap_size = find_mmap_size (); grub_dprintf ("linux", "real_size = %x, prot_size = %x, mmap_size = %x\n", (unsigned) real_size, (unsigned) prot_size, (unsigned) mmap_size); /* Calculate the number of pages; Combine the real mode code with the memory map buffer for simplicity. */ real_mode_pages = ((real_size + mmap_size) >> 12); prot_mode_pages = (prot_size >> 12); /* Initialize the memory pointers with NULL for convenience. */ free_pages (); /* FIXME: Should request low memory from the heap when this feature is implemented. */ auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t); int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type) { /* We must put real mode code in the traditional space. */ if (type == GRUB_MACHINE_MEMORY_AVAILABLE && addr <= 0x90000) { if (addr < 0x10000) { size += addr - 0x10000; addr = 0x10000; } if (addr + size > 0x90000) size = 0x90000 - addr; if (real_size + mmap_size > size) return 0; real_mode_mem = (void *) (grub_size_t) ((addr + size) - (real_size + mmap_size)); return 1; } return 0; } grub_mmap_iterate (hook); if (! real_mode_mem) { grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate real mode pages"); goto fail; } prot_mode_mem = (void *) 0x100000; grub_dprintf ("linux", "real_mode_mem = %lx, real_mode_pages = %x, " "prot_mode_mem = %lx, prot_mode_pages = %x\n", (unsigned long) real_mode_mem, (unsigned) real_mode_pages, (unsigned long) prot_mode_mem, (unsigned) prot_mode_pages); return 1; fail: free_pages (); return 0; } static void 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 >= GRUB_E820_MAX_ENTRY) grub_fatal ("Too many e820 memory map entries"); 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)++; } } static int grub_linux_setup_video (struct linux_kernel_params *params) { struct grub_video_mode_info mode_info; void *framebuffer; int ret; ret = grub_video_get_info_and_fini (&mode_info, &framebuffer); if (ret) 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; params->lfb_size = (params->lfb_line_len * params->lfb_height + 65535) >> 16; 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; #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 (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 0; } #ifdef __x86_64__ extern grub_uint8_t grub_linux_trampoline_start[]; extern grub_uint8_t grub_linux_trampoline_end[]; #endif static grub_err_t grub_linux_boot (void) { struct linux_kernel_params *params; int e820_num; grub_err_t err = 0; char *modevar, *tmp; params = real_mode_mem; grub_dprintf ("linux", "code32_start = %x, idt_desc = %lx, gdt_desc = %lx\n", (unsigned) params->code32_start, (unsigned long) &(idt_desc.limit), (unsigned long) &(gdt_desc.limit)); grub_dprintf ("linux", "idt = %x:%lx, gdt = %x:%lx\n", (unsigned) idt_desc.limit, (unsigned long) idt_desc.base, (unsigned) gdt_desc.limit, (unsigned long) gdt_desc.base); auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t); int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type) { switch (type) { case GRUB_MACHINE_MEMORY_AVAILABLE: grub_e820_add_region (params->e820_map, &e820_num, addr, size, GRUB_E820_RAM); break; #ifdef GRUB_MACHINE_MEMORY_ACPI case GRUB_MACHINE_MEMORY_ACPI: grub_e820_add_region (params->e820_map, &e820_num, addr, size, GRUB_E820_ACPI); break; #endif #ifdef GRUB_MACHINE_MEMORY_NVS case GRUB_MACHINE_MEMORY_NVS: grub_e820_add_region (params->e820_map, &e820_num, addr, size, GRUB_E820_NVS); break; #endif #ifdef GRUB_MACHINE_MEMORY_CODE case GRUB_MACHINE_MEMORY_CODE: grub_e820_add_region (params->e820_map, &e820_num, addr, size, GRUB_E820_EXEC_CODE); break; #endif default: grub_e820_add_region (params->e820_map, &e820_num, addr, size, GRUB_E820_RESERVED); } return 0; } e820_num = 0; grub_mmap_iterate (hook); params->mmap_size = e820_num; 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;text", modevar); if (! tmp) return grub_errno; err = grub_video_set_mode (tmp, 0, 0); grub_free (tmp); } else err = grub_video_set_mode ("text", 0, 0); if (err) { grub_print_error (); grub_printf ("Booting however\n"); grub_errno = GRUB_ERR_NONE; } if (! grub_linux_setup_video (params)) { /* Use generic framebuffer unless VESA is known to be supported. */ if (params->have_vga != GRUB_VIDEO_LINUX_TYPE_VESA) params->have_vga = GRUB_VIDEO_LINUX_TYPE_SIMPLE; } else { params->have_vga = GRUB_VIDEO_LINUX_TYPE_TEXT; params->video_width = 80; params->video_height = 25; } /* Initialize these last, because terminal position could be affected by printfs above. */ if (params->have_vga == GRUB_VIDEO_LINUX_TYPE_TEXT) { 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_uint16_t pos = grub_term_getxy (term); params->video_cursor_x = pos >> 8; params->video_cursor_y = pos & 0xff; found = 1; break; } if (!found) { params->video_cursor_x = 0; params->video_cursor_y = 0; } } #ifdef __x86_64__ grub_memcpy ((char *) prot_mode_mem + (prot_mode_pages << 12), grub_linux_trampoline_start, grub_linux_trampoline_end - grub_linux_trampoline_start); ((void (*) (unsigned long, void *)) ((char *) prot_mode_mem + (prot_mode_pages << 12))) (params->code32_start, real_mode_mem); #else /* Hardware interrupts are not safe any longer. */ asm volatile ("cli" : : ); /* Load the IDT and the GDT for the bootstrap. */ asm volatile ("lidt %0" : : "m" (idt_desc)); asm volatile ("lgdt %0" : : "m" (gdt_desc)); /* Enter Linux. */ asm volatile ("jmp *%2" : : "b" (0), "S" (real_mode_mem), "g" (params->code32_start)); #endif /* Never reach here. */ return GRUB_ERR_NONE; } static grub_err_t grub_linux_unload (void) { grub_dl_unref (my_mod); loaded = 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_kernel_header lh; struct linux_kernel_params *params; grub_uint8_t setup_sects; grub_size_t real_size, prot_size; grub_ssize_t len; int i; char *dest; grub_dl_ref (my_mod); if (argc == 0) { grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified"); goto fail; } file = grub_file_open (argv[0]); if (! file) goto fail; if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh)) { grub_error (GRUB_ERR_READ_ERROR, "cannot read the Linux header"); goto fail; } if (lh.boot_flag != grub_cpu_to_le16 (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; } 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; } /* 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 (GRUB_LINUX_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; } 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_size = grub_file_size (file) - real_size - GRUB_DISK_SECTOR_SIZE; if (! allocate_pages (prot_size)) goto fail; params = (struct linux_kernel_params *) real_mode_mem; grub_memset (params, 0, GRUB_LINUX_CL_END_OFFSET); grub_memcpy (¶ms->setup_sects, &lh.setup_sects, sizeof (lh) - 0x1F1); params->ps_mouse = params->padding10 = 0; len = 0x400 - sizeof (lh); if (grub_file_read (file, (char *) real_mode_mem + sizeof (lh), len) != len) { grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file"); goto fail; } params->type_of_loader = (LINUX_LOADER_ID_GRUB << 4); /* These two are used (instead of cmd_line_ptr) by older versions of Linux, and otherwise ignored. */ params->cl_magic = GRUB_LINUX_CL_MAGIC; params->cl_offset = 0x1000; params->cmd_line_ptr = (unsigned long) real_mode_mem + 0x1000; params->ramdisk_image = 0; params->ramdisk_size = 0; params->heap_end_ptr = GRUB_LINUX_HEAP_END_OFFSET; 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. */ params->ext_mem = ((32 * 0x100000) >> 10); params->alt_mem = ((32 * 0x100000) >> 10); /* Ignored by Linux. */ params->video_page = 0; /* Must be non-zero even in text mode, or Linux will think there's no VGA. */ params->video_mode = 0x3; /* Only used when `video_mode == 0x7', otherwise ignored. */ params->video_ega_bx = 0; params->font_size = 16; /* XXX */ /* 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 linux_vesafb_mode *linux_mode; grub_err_t err; char *buf; 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_printf ("Legacy `ask' parameter no longer supported.\n"); /* 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 ("%s is deprecated. " "Use set gfxpayload=text before " "linux command instead.\n", argv[i]); break; case 1: case GRUB_LINUX_VID_MODE_EXTENDED: /* FIXME: support 80x50 text. */ grub_env_set ("gfxpayload", "text"); grub_printf ("%s is deprecated. " "Use set gfxpayload=text before " "linux command instead.\n", argv[i]); break; default: /* Ignore invalid values. */ if (vid_mode < GRUB_LINUX_VID_MODE_VESA_START || vid_mode >= GRUB_LINUX_VID_MODE_VESA_START + ARRAY_SIZE (linux_vesafb_modes)) { grub_env_set ("gfxpayload", "text"); grub_printf ("%s is deprecated. Mode %d isn't recognized. " "Use set gfxpayload=WIDTHxHEIGHT[xDEPTH] before " "linux command instead.\n", argv[i], vid_mode); break; } /* We can't detect VESA, but user is implicitly telling us that it is built-in because `vga=' parameter was used. */ params->have_vga = GRUB_VIDEO_LINUX_TYPE_VESA; linux_mode = &linux_vesafb_modes[vid_mode - GRUB_LINUX_VID_MODE_VESA_START]; buf = grub_xasprintf ("%ux%ux%u,%ux%u", linux_vesafb_res[linux_mode->res_index].width, linux_vesafb_res[linux_mode->res_index].height, linux_mode->depth, linux_vesafb_res[linux_mode->res_index].width, linux_vesafb_res[linux_mode->res_index].height); if (! buf) goto fail; grub_printf ("%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) { 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; case 'm': shift += 10; case 'k': shift += 10; 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) { params->loadflags |= GRUB_LINUX_FLAG_QUIET; } /* Specify the boot file. */ dest = grub_stpcpy ((char *) real_mode_mem + GRUB_LINUX_CL_OFFSET, "BOOT_IMAGE="); dest = grub_stpcpy (dest, argv[0]); /* Copy kernel parameters. */ for (i = 1; i < argc && dest + grub_strlen (argv[i]) + 1 < ((char *) real_mode_mem + GRUB_LINUX_CL_END_OFFSET); i++) { *dest++ = ' '; dest = grub_stpcpy (dest, argv[i]); } len = prot_size; if (grub_file_read (file, (void *) GRUB_LINUX_BZIMAGE_ADDR, len) != len) grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file"); 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_file_t file = 0; grub_ssize_t size; grub_addr_t addr_min, addr_max; grub_addr_t addr; struct linux_kernel_header *lh; if (argc == 0) { grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified"); goto fail; } if (! loaded) { grub_error (GRUB_ERR_BAD_ARGUMENT, "you need to load the kernel first"); goto fail; } file = grub_file_open (argv[0]); if (! file) goto fail; size = grub_file_size (file); initrd_pages = (page_align (size) >> 12); lh = (struct linux_kernel_header *) real_mode_mem; /* Get the highest address available for the initrd. */ if (grub_le_to_cpu16 (lh->version) >= 0x0203) { addr_max = grub_cpu_to_le32 (lh->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; /* Usually, the compression ratio is about 50%. */ addr_min = (grub_addr_t) prot_mode_mem + ((prot_mode_pages * 3) << 12) + page_align (size); if (addr_max > grub_os_area_addr + grub_os_area_size) addr_max = grub_os_area_addr + grub_os_area_size; /* Put the initrd as high as possible, 4KiB aligned. */ addr = (addr_max - size) & ~0xFFF; if (addr < addr_min) { grub_error (GRUB_ERR_OUT_OF_RANGE, "the initrd is too big"); goto fail; } initrd_mem = (void *) addr; if (grub_file_read (file, initrd_mem, size) != size) { grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file"); goto fail; } grub_dprintf ("linux", "Initrd, addr=0x%x, size=0x%x\n", (unsigned) addr, (unsigned) size); lh->ramdisk_image = addr; lh->ramdisk_size = size; lh->root_dev = 0x0100; /* XXX */ fail: if (file) grub_file_close (file); 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); }