vbatts/grub
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity
grub/loader/i386/efi/linux.c
bean d8b3b60eea 2009-03-07 Bean <bean123ch@gmail.com> 
* loader/i386/efi/linux.c (grub_rescue_cmd_initrd): Fix a bug in initrd
	allocation.
2009-03-07 10:50:43 +00:00

1022 lines
27 KiB
C
Raw Blame History

/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007,2008,2009 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/machine/loader.h>
#include <grub/file.h>
#include <grub/disk.h>
#include <grub/err.h>
#include <grub/misc.h>
#include <grub/types.h>
#include <grub/rescue.h>
#include <grub/dl.h>
#include <grub/mm.h>
#include <grub/term.h>
#include <grub/cpu/linux.h>
#include <grub/efi/api.h>
#include <grub/efi/efi.h>
#include <grub/efi/uga_draw.h>
#define GRUB_LINUX_CL_OFFSET 0x1000
#define GRUB_LINUX_CL_END_OFFSET 0x2000
#define NEXT_MEMORY_DESCRIPTOR(desc, size) \
((grub_efi_memory_descriptor_t *) ((char *) (desc) + (size)))
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_efi_uintn_t real_mode_pages;
static grub_efi_uintn_t prot_mode_pages;
static grub_efi_uintn_t initrd_pages;
static void *mmap_buf;
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
};
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. Is it better to
move this code to efi/mm.c? */
static grub_efi_uintn_t
find_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;
mmap = grub_malloc (mmap_size);
if (! mmap)
return 0;
ret = grub_efi_get_memory_map (&mmap_size, mmap, 0, &desc_size, 0);
grub_free (mmap);
if (ret < 0)
grub_fatal ("cannot get memory map");
else if (ret > 0)
break;
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 += (1 << 12);
return page_align (mmap_size);
}
static void
free_pages (void)
{
if (real_mode_mem)
{
grub_efi_free_pages ((grub_addr_t) real_mode_mem, real_mode_pages);
real_mode_mem = 0;
}
if (prot_mode_mem)
{
grub_efi_free_pages ((grub_addr_t) prot_mode_mem, prot_mode_pages);
prot_mode_mem = 0;
}
if (initrd_mem)
{
grub_efi_free_pages ((grub_addr_t) initrd_mem, initrd_pages);
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_efi_uintn_t desc_size;
grub_efi_memory_descriptor_t *mmap, *mmap_end;
grub_efi_uintn_t mmap_size, tmp_mmap_size;
grub_efi_memory_descriptor_t *desc;
grub_size_t real_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. */
real_mode_mem = 0;
prot_mode_mem = 0;
/* Read the memory map temporarily, to find free space. */
mmap = grub_malloc (mmap_size);
if (! mmap)
return 0;
tmp_mmap_size = mmap_size;
if (grub_efi_get_memory_map (&tmp_mmap_size, mmap, 0, &desc_size, 0) <= 0)
grub_fatal ("cannot get memory map");
mmap_end = NEXT_MEMORY_DESCRIPTOR (mmap, tmp_mmap_size);
/* First, find free pages for the real mode code
and the memory map buffer. */
for (desc = mmap;
desc < mmap_end;
desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
{
/* Probably it is better to put the real mode code in the traditional
space for safety. */
if (desc->type == GRUB_EFI_CONVENTIONAL_MEMORY
&& desc->physical_start <= 0x90000
&& desc->num_pages >= real_mode_pages)
{
grub_efi_physical_address_t physical_end;
grub_efi_physical_address_t addr;
physical_end = desc->physical_start + (desc->num_pages << 12);
if (physical_end > 0x90000)
physical_end = 0x90000;
grub_dprintf ("linux", "physical_start = %x, physical_end = %x\n",
(unsigned) desc->physical_start,
(unsigned) physical_end);
addr = physical_end - real_size - mmap_size;
if (addr < 0x10000)
continue;
grub_dprintf ("linux", "trying to allocate %u pages at %lx\n",
(unsigned) real_mode_pages, (unsigned long) addr);
real_mode_mem = grub_efi_allocate_pages (addr, real_mode_pages);
if (! real_mode_mem)
grub_fatal ("cannot allocate pages");
desc->num_pages -= real_mode_pages;
break;
}
}
if (! real_mode_mem)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate real mode pages");
goto fail;
}
mmap_buf = (void *) ((char *) real_mode_mem + real_size);
/* Next, find free pages for the protected mode code. */
/* XXX what happens if anything is using this address? */
prot_mode_mem = grub_efi_allocate_pages (0x100000, prot_mode_pages);
if (! prot_mode_mem)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY,
"cannot allocate protected mode pages");
goto fail;
}
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);
grub_free (mmap);
return 1;
fail:
grub_free (mmap);
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 grub_efi_guid_t acpi_guid = GRUB_EFI_ACPI_TABLE_GUID;
static grub_efi_guid_t acpi2_guid = GRUB_EFI_ACPI_20_TABLE_GUID;
#define EBDA_SEG_ADDR 0x40e
#define LOW_MEM_ADDR 0x413
#define FAKE_EBDA_SEG 0x9fc0
static void
fake_bios_data (void)
{
unsigned i;
void *acpi;
grub_uint16_t *ebda_seg_ptr, *low_mem_ptr;
acpi = 0;
for (i = 0; i < grub_efi_system_table->num_table_entries; i++)
{
grub_efi_guid_t *guid =
&grub_efi_system_table->configuration_table[i].vendor_guid;
if (! grub_memcmp (guid, &acpi2_guid, sizeof (grub_efi_guid_t)))
{
acpi = grub_efi_system_table->configuration_table[i].vendor_table;
grub_printf ("ACPI2: %p\n", acpi);
}
else if (! grub_memcmp (guid, &acpi_guid, sizeof (grub_efi_guid_t)))
{
void *t;
t = grub_efi_system_table->configuration_table[i].vendor_table;
if (! acpi)
acpi = t;
grub_printf ("ACPI: %p\n", t);
}
}
if (acpi == 0)
return;
ebda_seg_ptr = (grub_uint16_t *) EBDA_SEG_ADDR;
low_mem_ptr = (grub_uint16_t *) LOW_MEM_ADDR;
if ((*ebda_seg_ptr) || (*low_mem_ptr))
return;
*ebda_seg_ptr = FAKE_EBDA_SEG;
*low_mem_ptr = FAKE_EBDA_SEG >> 6;
grub_memcpy ((char *) (FAKE_EBDA_SEG << 4), acpi, 1024);
}
#ifdef __x86_64__
struct
{
grub_uint32_t kernel_entry;
grub_uint32_t kernel_cs;
} jumpvector;
#endif
static grub_err_t
grub_linux_boot (void)
{
struct linux_kernel_params *params;
grub_efi_uintn_t mmap_size;
grub_efi_uintn_t map_key;
grub_efi_uintn_t desc_size;
grub_efi_uint32_t desc_version;
grub_efi_memory_descriptor_t *desc;
int e820_num;
fake_bios_data ();
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);
mmap_size = find_mmap_size ();
if (grub_efi_get_memory_map (&mmap_size, mmap_buf, &map_key,
&desc_size, &desc_version) <= 0)
grub_fatal ("cannot get memory map");
e820_num = 0;
for (desc = mmap_buf;
desc < NEXT_MEMORY_DESCRIPTOR (mmap_buf, mmap_size);
desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
{
switch (desc->type)
{
case GRUB_EFI_ACPI_RECLAIM_MEMORY:
grub_e820_add_region (params->e820_map, &e820_num,
desc->physical_start,
desc->num_pages << 12,
GRUB_E820_ACPI);
break;
case GRUB_EFI_ACPI_MEMORY_NVS:
grub_e820_add_region (params->e820_map, &e820_num,
desc->physical_start,
desc->num_pages << 12,
GRUB_E820_NVS);
break;
case GRUB_EFI_RUNTIME_SERVICES_CODE:
grub_e820_add_region (params->e820_map, &e820_num,
desc->physical_start,
desc->num_pages << 12,
GRUB_E820_EXEC_CODE);
break;
case GRUB_EFI_LOADER_CODE:
case GRUB_EFI_LOADER_DATA:
case GRUB_EFI_BOOT_SERVICES_CODE:
case GRUB_EFI_BOOT_SERVICES_DATA:
case GRUB_EFI_CONVENTIONAL_MEMORY:
{
grub_uint64_t start, size, end;
start = desc->physical_start;
size = desc->num_pages << 12;
end = start + size;
/* Skip A0000 - 100000 region. */
if ((start < 0x100000ULL) && (end > 0xA0000ULL))
{
if (start < 0xA0000ULL)
{
grub_e820_add_region (params->e820_map, &e820_num,
start,
0xA0000ULL - start,
GRUB_E820_RAM);
}
if (end <= 0x100000ULL)
continue;
start = 0x100000ULL;
size = end - start;
}
grub_e820_add_region (params->e820_map, &e820_num,
start, size, GRUB_E820_RAM);
break;
}
default:
grub_e820_add_region (params->e820_map, &e820_num,
desc->physical_start,
desc->num_pages << 12,
GRUB_E820_RESERVED);
}
}
params->mmap_size = e820_num;
if (! grub_efi_exit_boot_services (map_key))
grub_fatal ("cannot exit boot services");
/* Note that no boot services are available from here. */
/* Pass EFI parameters. */
if (grub_le_to_cpu16 (params->version) >= 0x0206)
{
params->v0206.efi_mem_desc_size = desc_size;
params->v0206.efi_mem_desc_version = desc_version;
params->v0206.efi_mmap = (grub_uint32_t) (unsigned long) mmap_buf;
params->v0206.efi_mmap_size = mmap_size;
#ifdef __x86_64__
params->v0206.efi_mmap_hi = (grub_uint32_t) ((grub_uint64_t) mmap_buf >> 32);
#endif
}
else if (grub_le_to_cpu16 (params->version) >= 0x0204)
{
params->v0204.efi_mem_desc_size = desc_size;
params->v0204.efi_mem_desc_version = desc_version;
params->v0204.efi_mmap = (grub_uint32_t) (unsigned long) mmap_buf;
params->v0204.efi_mmap_size = mmap_size;
}
/* 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));
#ifdef __x86_64__
jumpvector.kernel_entry = (grub_uint64_t) grub_linux_real_boot;
jumpvector.kernel_cs = 0x10;
asm volatile ( "mov %0, %%rbx" : : "m" (params->code32_start));
asm volatile ( "mov %0, %%rsi" : : "m" (real_mode_mem));
asm volatile ( "ljmp *%0" : : "m" (jumpvector));
#else
/* Pass parameters. */
asm volatile ("movl %0, %%ecx" : : "m" (params->code32_start));
asm volatile ("movl %0, %%esi" : : "m" (real_mode_mem));
asm volatile ("xorl %%ebx, %%ebx" : : );
/* Enter Linux. */
asm volatile ("jmp *%%ecx" : : );
#endif
/* Never reach here. */
return GRUB_ERR_NONE;
}
static grub_err_t
grub_linux_unload (void)
{
free_pages ();
grub_dl_unref (my_mod);
loaded = 0;
return GRUB_ERR_NONE;
}
static grub_efi_guid_t uga_draw_guid = GRUB_EFI_UGA_DRAW_GUID;
#define RGB_MASK 0xffffff
#define RGB_MAGIC 0x121314
#define LINE_MIN 800
#define LINE_MAX 4096
#define FBTEST_STEP (0x10000 >> 2)
#define FBTEST_COUNT 8
static grub_uint32_t fb_list[]=
{0x40000000, 0x80000000, 0xc0000000, 0};
static int
find_framebuf (grub_uint32_t *fb_base, grub_uint32_t *line_len)
{
grub_uint32_t *fb;
for (fb = fb_list; *fb; fb++)
{
grub_uint32_t *base = (grub_uint32_t *) (grub_target_addr_t) *fb;
int i;
for (i = 0; i < FBTEST_COUNT; i++, base += FBTEST_STEP)
{
if ((*base & RGB_MASK) == RGB_MAGIC)
{
int j;
for (j = LINE_MIN; j <= LINE_MAX; j++)
{
if ((base[j] & RGB_MASK) == RGB_MAGIC)
{
*fb_base = (grub_uint32_t) (grub_target_addr_t) base;
*line_len = j << 2;
return 0;
}
}
break;
}
}
}
return 1;
}
static int
grub_linux_setup_video (struct linux_kernel_params *params)
{
grub_efi_uga_draw_protocol_t *c;
grub_uint32_t width, height, depth, rate, pixel, fb_base, line_len;
int ret;
c = grub_efi_locate_protocol (&uga_draw_guid, 0);
if (! c)
return 1;
if (efi_call_5 (c->get_mode, c, &width, &height, &depth, &rate))
return 1;
grub_printf ("Video mode: %ux%u-%u@%u\n", width, height, depth, rate);
grub_efi_set_text_mode (0);
pixel = RGB_MAGIC;
efi_call_10 (c->blt, c, (struct grub_efi_uga_pixel *) &pixel,
GRUB_EFI_UGA_VIDEO_FILL, 0, 0, 0, 0, 1, height, 0);
ret = find_framebuf (&fb_base, &line_len);
grub_efi_set_text_mode (1);
if (ret)
{
grub_printf ("Can\'t find frame buffer address\n");
return 1;
}
grub_printf ("Video frame buffer: 0x%x\n", fb_base);
grub_printf ("Video line length: %d\n", line_len);
params->lfb_width = width;
params->lfb_height = height;
params->lfb_depth = depth;
params->lfb_line_len = line_len;
params->lfb_base = fb_base;
params->lfb_size = (line_len * params->lfb_height + 65535) >> 16;
params->red_mask_size = 8;
params->red_field_pos = 16;
params->green_mask_size = 8;
params->green_field_pos = 8;
params->blue_mask_size = 8;
params->blue_field_pos = 0;
params->reserved_mask_size = 8;
params->reserved_field_pos = 24;
return 0;
}
void
grub_rescue_cmd_linux (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;
int video_type;
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, (char *) &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;
}
/* EFI support is quite new, so reject old versions. */
if (lh.header != grub_cpu_to_le32 (GRUB_LINUX_MAGIC_SIGNATURE)
|| grub_le_to_cpu16 (lh.version) < 0x0203)
{
grub_error (GRUB_ERR_BAD_OS, "too old version");
goto fail;
}
/* I'm not sure how to support zImage on EFI. */
if (! (lh.loadflags & GRUB_LINUX_FLAG_BIG_KERNEL))
{
grub_error (GRUB_ERR_BAD_OS, "zImage is not supported");
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 (&params->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;
}
/* XXX Linux assumes that only elilo can boot Linux on EFI!!! */
params->type_of_loader = (LINUX_LOADER_ID_ELILO << 4);
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);
params->video_cursor_x = grub_getxy () >> 8;
params->video_cursor_y = grub_getxy () & 0xff;
params->video_page = 0; /* ??? */
params->video_mode = grub_efi_system_table->con_out->mode->mode;
params->video_width = (grub_getwh () >> 8);
params->video_ega_bx = 0;
params->video_height = (grub_getwh () & 0xff);
params->have_vga = 0;
params->font_size = 16; /* XXX */
if (grub_le_to_cpu16 (params->version) >= 0x0206)
{
params->v0206.efi_signature = GRUB_LINUX_EFI_SIGNATURE;
params->v0206.efi_system_table = (grub_uint32_t) (unsigned long) grub_efi_system_table;
#ifdef __x86_64__
params->v0206.efi_system_table_hi = (grub_uint32_t) ((grub_uint64_t) grub_efi_system_table >> 32);
#endif
}
else if (grub_le_to_cpu16 (params->version) >= 0x0204)
{
params->v0204.efi_signature = GRUB_LINUX_EFI_SIGNATURE_0204;
params->v0204.efi_system_table = (grub_uint32_t) (unsigned long) grub_efi_system_table;
}
#if 0
/* The structure is zeroed already. */
/* No VBE on EFI. */
params->lfb_width = 0;
params->lfb_height = 0;
params->lfb_depth = 0;
params->lfb_base = 0;
params->lfb_size = 0;
params->lfb_line_len = 0;
params->red_mask_size = 0;
params->red_field_pos = 0;
params->green_mask_size = 0;
params->green_field_pos = 0;
params->blue_mask_size = 0;
params->blue_field_pos = 0;
params->reserved_mask_size = 0;
params->reserved_field_pos = 0;
params->vesapm_segment = 0;
params->vesapm_offset = 0;
params->lfb_pages = 0;
params->vesa_attrib = 0;
/* No APM on EFI. */
params->apm_version = 0;
params->apm_code_segment = 0;
params->apm_entry = 0;
params->apm_16bit_code_segment = 0;
params->apm_data_segment = 0;
params->apm_flags = 0;
params->apm_code_len = 0;
params->apm_data_len = 0;
/* XXX is there any way to use SpeedStep on EFI? */
params->ist_signature = 0;
params->ist_command = 0;
params->ist_event = 0;
params->ist_perf_level = 0;
/* Let the kernel probe the information. */
grub_memset (params->hd0_drive_info, 0, sizeof (params->hd0_drive_info));
grub_memset (params->hd1_drive_info, 0, sizeof (params->hd1_drive_info));
/* No MCA on EFI. */
params->rom_config_len = 0;
/* No need to fake the BIOS's memory map. */
params->mmap_size = 0;
/* Let the kernel probe the information. */
params->ps_mouse = 0;
/* Clear padding for future compatibility. */
grub_memset (params->padding1, 0, sizeof (params->padding1));
grub_memset (params->padding2, 0, sizeof (params->padding2));
grub_memset (params->padding3, 0, sizeof (params->padding3));
grub_memset (params->padding4, 0, sizeof (params->padding4));
grub_memset (params->padding5, 0, sizeof (params->padding5));
grub_memset (params->padding6, 0, sizeof (params->padding6));
grub_memset (params->padding7, 0, sizeof (params->padding7));
grub_memset (params->padding8, 0, sizeof (params->padding8));
grub_memset (params->padding9, 0, sizeof (params->padding9));
#endif
/* The other EFI parameters are filled when booting. */
grub_file_seek (file, real_size + GRUB_DISK_SECTOR_SIZE);
/* XXX there is no way to know if the kernel really supports EFI. */
grub_printf (" [Linux-bzImage, setup=0x%x, size=0x%x]\n",
(unsigned) real_size, (unsigned) prot_size);
/* Detect explicitly specified memory size, if any. */
linux_mem_size = 0;
video_type = 0;
for (i = 1; i < argc; i++)
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], "video=", 6) == 0)
{
if (grub_memcmp (&argv[i][6], "vesafb", 6) == 0)
video_type = GRUB_VIDEO_TYPE_VLFB;
else if (grub_memcmp (&argv[i][6], "efifb", 5) == 0)
video_type = GRUB_VIDEO_TYPE_EFI;
}
if (video_type)
{
if (! grub_linux_setup_video (params))
params->have_vga = video_type;
}
/* 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, (char *) 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, 1);
loaded = 1;
}
fail:
if (file)
grub_file_close (file);
if (grub_errno != GRUB_ERR_NONE)
{
grub_dl_unref (my_mod);
loaded = 0;
}
}
void
grub_rescue_cmd_initrd (int argc, char *argv[])
{
grub_file_t file = 0;
grub_ssize_t size;
grub_addr_t addr_min, addr_max;
grub_addr_t addr;
grub_efi_uintn_t mmap_size;
grub_efi_memory_descriptor_t *desc;
grub_efi_uintn_t desc_size;
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;
addr_max = (grub_cpu_to_le32 (lh->initrd_addr_max) << 10);
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);
/* Find the highest address to put the initrd. */
mmap_size = find_mmap_size ();
if (grub_efi_get_memory_map (&mmap_size, mmap_buf, 0, &desc_size, 0) <= 0)
grub_fatal ("cannot get memory map");
addr = 0;
for (desc = mmap_buf;
desc < NEXT_MEMORY_DESCRIPTOR (mmap_buf, mmap_size);
desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
{
if (desc->type == GRUB_EFI_CONVENTIONAL_MEMORY
&& desc->num_pages >= initrd_pages)
{
grub_efi_physical_address_t physical_end;
physical_end = desc->physical_start + (desc->num_pages << 12);
if (physical_end > addr_max)
physical_end = addr_max;
if (physical_end < page_align (size))
continue;
physical_end -= page_align (size);
if ((physical_end >= addr_min) &&
(physical_end >= desc->physical_start) &&
(physical_end > addr))
addr = physical_end;
}
}
if (addr == 0)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "no free pages available");
goto fail;
}
initrd_mem = grub_efi_allocate_pages (addr, initrd_pages);
if (! initrd_mem)
grub_fatal ("cannot allocate pages");
if (grub_file_read (file, initrd_mem, size) != size)
{
grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file");
goto fail;
}
grub_printf (" [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);
}
GRUB_MOD_INIT(linux)
{
grub_rescue_register_command ("linux",
grub_rescue_cmd_linux,
"load linux");
grub_rescue_register_command ("initrd",
grub_rescue_cmd_initrd,
"load initrd");
my_mod = mod;
}
GRUB_MOD_FINI(linux)
{
grub_rescue_unregister_command ("linux");
grub_rescue_unregister_command ("initrd");
}
Reference in a new issue View git blame Copy permalink