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grub/grub-core/loader/i386/linux.c
Peter Jones d5a32255de misc: Make grub_strtol() "end" pointers have safer const qualifiers 
Currently the string functions grub_strtol(), grub_strtoul(), and
grub_strtoull() don't declare the "end" pointer in such a way as to
require the pointer itself or the character array to be immutable to the
implementation, nor does the C standard do so in its similar functions,
though it does require us not to change any of it.

The typical declarations of these functions follow this pattern:

long
strtol(const char * restrict nptr, char ** restrict endptr, int base);

Much of the reason for this is historic, and a discussion of that
follows below, after the explanation of this change.  (GRUB currently
does not include the "restrict" qualifiers, and we name the arguments a
bit differently.)

The implementation is semantically required to treat the character array
as immutable, but such accidental modifications aren't stopped by the
compiler, and the semantics for both the callers and the implementation
of these functions are sometimes also helped by adding that requirement.

This patch changes these declarations to follow this pattern instead:

long
strtol(const char * restrict nptr,
       const char ** const restrict endptr,
       int base);

This means that if any modification to these functions accidentally
introduces either an errant modification to the underlying character
array, or an accidental assignment to endptr rather than *endptr, the
compiler should generate an error.  (The two uses of "restrict" in this
case basically mean strtol() isn't allowed to modify the character array
by going through *endptr, and endptr isn't allowed to point inside the
array.)

It also means the typical use case changes to:

  char *s = ...;
  const char *end;
  long l;

  l = strtol(s, &end, 10);

Or even:

  const char *p = str;
  while (p && *p) {
	  long l = strtol(p, &p, 10);
	  ...
  }

This fixes 26 places where we discard our attempts at treating the data
safely by doing:

  const char *p = str;
  long l;

  l = strtol(p, (char **)&ptr, 10);

It also adds 5 places where we do:

  char *p = str;
  while (p && *p) {
	  long l = strtol(p, (const char ** const)&p, 10);
	  ...
	  /* more calls that need p not to be pointer-to-const */
  }

While moderately distasteful, this is a better problem to have.

With one minor exception, I have tested that all of this compiles
without relevant warnings or errors, and that /much/ of it behaves
correctly, with gcc 9 using 'gcc -W -Wall -Wextra'.  The one exception
is the changes in grub-core/osdep/aros/hostdisk.c , which I have no idea
how to build.

Because the C standard defined type-qualifiers in a way that can be
confusing, in the past there's been a slow but fairly regular stream of
churn within our patches, which add and remove the const qualifier in many
of the users of these functions.  This change should help avoid that in
the future, and in order to help ensure this, I've added an explanation
in misc.h so that when someone does get a compiler warning about a type
error, they have the fix at hand.

The reason we don't have "const" in these calls in the standard is
purely anachronistic: C78 (de facto) did not have type qualifiers in the
syntax, and the "const" type qualifier was added for C89 (I think; it
may have been later).  strtol() appears to date from 4.3BSD in 1986,
which means it could not be added to those functions in the standard
without breaking compatibility, which is usually avoided.

The syntax chosen for type qualifiers is what has led to the churn
regarding usage of const, and is especially confusing on string
functions due to the lack of a string type.  Quoting from C99, the
syntax is:

 declarator:
  pointer[opt] direct-declarator
 direct-declarator:
  identifier
  ( declarator )
  direct-declarator [ type-qualifier-list[opt] assignment-expression[opt] ]
  ...
  direct-declarator [ type-qualifier-list[opt] * ]
  ...
 pointer:
  * type-qualifier-list[opt]
  * type-qualifier-list[opt] pointer
 type-qualifier-list:
  type-qualifier
  type-qualifier-list type-qualifier
 ...
 type-qualifier:
  const
  restrict
  volatile

So the examples go like:

const char foo;			// immutable object
const char *foo;		// mutable pointer to object
char * const foo;		// immutable pointer to mutable object
const char * const foo;		// immutable pointer to immutable object
const char const * const foo; 	// XXX extra const keyword in the middle
const char * const * const foo; // immutable pointer to immutable
				//   pointer to immutable object
const char ** const foo;	// immutable pointer to mutable pointer
				//   to immutable object

Making const left-associative for * and right-associative for everything
else may not have been the best choice ever, but here we are, and the
inevitable result is people using trying to use const (as they should!),
putting it at the wrong place, fighting with the compiler for a bit, and
then either removing it or typecasting something in a bad way.  I won't
go into describing restrict, but its syntax has exactly the same issue
as with const.

Anyway, the last example above actually represents the *behavior* that's
required of strtol()-like functions, so that's our choice for the "end"
pointer.

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2020-02-28 12:41:29 +01:00

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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/machine/kernel.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));
}
/* 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;
#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;
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_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 = 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));
/*
* 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.padding10 = 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);
}
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