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grub/grub-core/loader/i386/linux.c
Matthew Garrett bb3473d7c8 Rework TPM measurements 
Rework TPM measurements to use fewer PCRs. After discussion with upstream,
it's preferable to avoid using so many PCRs. Instead, measure into PCRs 8
and 9 but use a prefix in the event log to indicate which subsystem carried
out the measurements.
2016-03-23 17:03:43 -07:00

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/*
* 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/tpm.h>
#include "verity-hash.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>
#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));
}
#ifdef GRUB_MACHINE_EFI
/* Find the optimal number of pages for the memory map. Is it better to
move this code to efi/mm.c? */
static grub_efi_uintn_t
find_efi_mmap_size (void)
{
static grub_efi_uintn_t mmap_size = 0;
if (mmap_size != 0)
return mmap_size;
mmap_size = (1 << 12);
while (1)
{
int ret;
grub_efi_memory_descriptor_t *mmap;
grub_efi_uintn_t desc_size;
grub_efi_uintn_t cur_mmap_size = mmap_size;
mmap = grub_malloc (cur_mmap_size);
if (! mmap)
return 0;
ret = grub_efi_get_memory_map (&cur_mmap_size, mmap, 0, &desc_size, 0);
grub_free (mmap);
if (ret < 0)
{
grub_error (GRUB_ERR_IO, "cannot get memory map");
return 0;
}
else if (ret > 0)
break;
if (mmap_size < cur_mmap_size)
mmap_size = cur_mmap_size;
mmap_size += (1 << 12);
}
/* Increase the size a bit for safety, because GRUB allocates more on
later, and EFI itself may allocate more. */
mmap_size += (3 << 12);
mmap_size = page_align (mmap_size);
return mmap_size;
}
#endif
/* 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,
0xffffffff & ~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;
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;
}
}
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 = find_efi_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;
err = grub_relocator_alloc_chunk_addr (relocator, &ch,
ctx.real_mode_target,
(ctx.real_size + efi_mmap_size));
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;
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_kernel_header lh;
grub_uint8_t setup_sects;
grub_size_t real_size, prot_size, prot_file_size, kernel_offset;
grub_ssize_t len;
int i;
grub_size_t align, min_align;
int relocatable;
grub_uint64_t preferred_address = GRUB_LINUX_BZIMAGE_ADDR;
grub_uint8_t *kernel = NULL;
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]);
if (! file)
goto fail;
len = grub_file_size (file);
kernel = grub_malloc (len);
if (!kernel)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("cannot allocate kernel buffer"));
goto fail;
}
if (grub_file_read (file, kernel, len) != len)
{
if (!grub_errno)
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
argv[0]);
goto fail;
}
grub_tpm_measure (kernel, len, GRUB_BINARY_PCR, "grub_linux", "Kernel");
grub_memcpy (&lh, kernel, sizeof (lh));
kernel_offset = sizeof (lh);
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_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 = grub_le_to_cpu32 (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
preferred_address = GRUB_LINUX_BZIMAGE_ADDR;
}
else
{
min_align = align;
prot_size = prot_file_size;
preferred_address = GRUB_LINUX_BZIMAGE_ADDR;
/* 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));
grub_memcpy (&linux_params.setup_sects, &lh.setup_sects, sizeof (lh) - 0x1F1);
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.padding10 = 0;
len = sizeof (linux_params) - sizeof (lh);
grub_memcpy (&linux_params + sizeof (lh), kernel + kernel_offset, len);
kernel_offset += len;
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. */
kernel_offset = 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"), "text",
argv[i]);
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"), "text",
argv[i]);
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)
{
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)
{
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_create_loader_cmdline (argc, argv,
linux_cmdline
+ sizeof (LINUX_IMAGE) - 1,
maximal_cmdline_size
- (sizeof (LINUX_IMAGE) - 1));
grub_pass_verity_hash(&lh, linux_cmdline);
len = prot_file_size;
grub_memcpy (prot_mode_mem, kernel + kernel_offset, len);
kernel_offset += len;
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:
grub_free (kernel);
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);
}
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