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Enable linux16 on non-BIOS systems for i.a. memtest.

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* grub-core/loader/i386/pc/linux.c (grub_cmd_linux): Handle hole at 0
	correctly.
	* grub-core/Makefile.core.def (linux16): Enable on all x86 flavours.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2013-02-28 22:48:41 +01:00
parent 005a9c32df
commit 0789b67232
3 changed files with 54 additions and 20 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2013-02-28 Vladimir Serbinenko <phcoder@gmail.com>
Enable linux16 on non-BIOS systems for i.a. memtest.
* grub-core/loader/i386/pc/linux.c (grub_cmd_linux): Handle hole at 0
correctly.
* grub-core/Makefile.core.def (linux16): Enable on all x86 flavours.
2013-02-28 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/kern/i386/coreboot/mmap.c (grub_linuxbios_table_iterate):

6
grub-core/Makefile.core.def
View file

@ -1390,9 +1390,9 @@ module = {
module = {
name = linux16;
i386_pc = loader/i386/pc/linux.c;
i386_pc = lib/cmdline.c;
enable = i386_pc;
common = loader/i386/pc/linux.c;
common = lib/cmdline.c;
enable = x86;
};
module = {

60
grub-core/loader/i386/pc/linux.c
View file

@ -79,6 +79,42 @@ grub_linux_unload (void)
return GRUB_ERR_NONE;
}
static int
target_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
void *data)
{
grub_uint64_t *result = data;
grub_uint64_t candidate;
if (type != GRUB_MEMORY_AVAILABLE)
return 0;
if (addr >= 0xa0000)
return 0;
if (addr + size >= 0xa0000)
size = 0xa0000 - addr;
/* Put the real mode part at as a high location as possible. */
candidate = addr + size - (GRUB_LINUX_CL_OFFSET + maximal_cmdline_size);
/* But it must not exceed the traditional area. */
if (candidate > GRUB_LINUX_OLD_REAL_MODE_ADDR)
candidate = GRUB_LINUX_OLD_REAL_MODE_ADDR;
if (candidate < addr)
return 0;
if (candidate > *result || *result == (grub_uint64_t) -1)
*result = candidate;
return 0;
}
static grub_addr_t
grub_find_real_target (void)
{
grub_uint64_t result = (grub_uint64_t) -1;
grub_mmap_iterate (target_hook, &result);
return result;
}
static grub_err_t
grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
@ -141,12 +177,13 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
if (grub_le_to_cpu16 (lh.version) >= 0x0206)
maximal_cmdline_size = grub_le_to_cpu32 (lh.cmdline_size) + 1;
/* Put the real mode part at as a high location as possible. */
grub_linux_real_target = grub_mmap_get_lower ()
- (GRUB_LINUX_CL_OFFSET + maximal_cmdline_size);
/* But it must not exceed the traditional area. */
if (grub_linux_real_target > GRUB_LINUX_OLD_REAL_MODE_ADDR)
grub_linux_real_target = GRUB_LINUX_OLD_REAL_MODE_ADDR;
grub_linux_real_target = grub_find_real_target ();
if (grub_linux_real_target == (grub_addr_t)-1)
{
grub_error (GRUB_ERR_OUT_OF_RANGE,
"no appropriate low memory found");
goto fail;
}
if (grub_le_to_cpu16 (lh.version) >= 0x0201)
{
@ -193,17 +230,6 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
goto fail;
}
if (grub_linux_real_target + GRUB_LINUX_CL_OFFSET + maximal_cmdline_size
> grub_mmap_get_lower ())
{
grub_error (GRUB_ERR_OUT_OF_RANGE,
"too small lower memory (0x%x > 0x%x)",
grub_linux_real_target + GRUB_LINUX_CL_OFFSET
+ maximal_cmdline_size,
(int) grub_mmap_get_lower ());
goto fail;
}
grub_dprintf ("linux", "[Linux-%s, setup=0x%x, size=0x%x]\n",
grub_linux_is_bzimage ? "bzImage" : "zImage", real_size,
grub_linux16_prot_size);