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Lift up core size limits on some platforms. Fix potential memory

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corruption with big core on small memory systems. Document remaining
	limits.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2013-03-07 08:17:24 +01:00
parent f6b58fe538
commit 774683685f
9 changed files with 210 additions and 32 deletions
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36
grub-core/kern/i386/coreboot/init.c
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@ -54,7 +54,8 @@ grub_exit (void)
#ifdef GRUB_MACHINE_QEMU
grub_addr_t grub_modbase;
#else
grub_addr_t grub_modbase = ALIGN_UP((grub_addr_t) _end, GRUB_KERNEL_MACHINE_MOD_ALIGN);
grub_addr_t grub_modbase = GRUB_KERNEL_I386_COREBOOT_MODULES_ADDR;
static grub_uint64_t modend;
#endif
/* Helper for grub_machine_init. */
@ -62,30 +63,32 @@ static int
heap_init (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
void *data __attribute__ ((unused)))
{
grub_uint64_t begin = addr, end = addr + size;
#if GRUB_CPU_SIZEOF_VOID_P == 4
/* Restrict ourselves to 32-bit memory space. */
if (addr > GRUB_ULONG_MAX)
if (begin > GRUB_ULONG_MAX)
return 0;
if (addr + size > GRUB_ULONG_MAX)
size = GRUB_ULONG_MAX - addr;
if (end > GRUB_ULONG_MAX)
end = GRUB_ULONG_MAX;
#endif
if (type != GRUB_MEMORY_AVAILABLE)
return 0;
/* Avoid the lower memory. */
if (addr < GRUB_MEMORY_MACHINE_LOWER_SIZE)
{
if (addr + size <= GRUB_MEMORY_MACHINE_LOWER_SIZE)
return 0;
else
{
size -= GRUB_MEMORY_MACHINE_LOWER_SIZE - addr;
addr = GRUB_MEMORY_MACHINE_LOWER_SIZE;
}
}
if (begin < GRUB_MEMORY_MACHINE_LOWER_SIZE)
begin = GRUB_MEMORY_MACHINE_LOWER_SIZE;
grub_mm_init_region ((void *) (grub_addr_t) addr, (grub_size_t) size);
#ifndef GRUB_MACHINE_QEMU
if (modend && begin < modend)
begin = modend;
#endif
if (end <= begin)
return 0;
grub_mm_init_region ((void *) (grub_addr_t) begin, (grub_size_t) (end - begin));
return 0;
}
@ -97,6 +100,9 @@ grub_machine_init (void)
grub_modbase = grub_core_entry_addr + (_edata - _start);
grub_qemu_init_cirrus ();
#endif
#ifndef GRUB_MACHINE_QEMU
modend = grub_modules_get_end ();
#endif
/* Initialize the console as early as possible. */
grub_vga_text_init ();