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Merge branch 'x86-bios-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'x86-bios-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, bios: Make the x86 early memory reservation a kernel option
  x86, bios: By default, reserve the low 64K for all BIOSes
This commit is contained in:
Linus Torvalds
2010-10-21 13:06:49 -07:00
parent e990c77d06 9ea77bdb39
commit 781c5a67f1
3 changed files with 59 additions and 91 deletions
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106
arch/x86/kernel/setup.c
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@@ -619,79 +619,7 @@ static __init void reserve_ibft_region(void)
reserve_early_overlap_ok(addr, addr + size, "ibft");
}
#ifdef CONFIG_X86_RESERVE_LOW_64K
static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
{
printk(KERN_NOTICE
"%s detected: BIOS may corrupt low RAM, working around it.\n",
d->ident);
e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
return 0;
}
#endif
/* List of systems that have known low memory corruption BIOS problems */
static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
#ifdef CONFIG_X86_RESERVE_LOW_64K
{
.callback = dmi_low_memory_corruption,
.ident = "AMI BIOS",
.matches = {
DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
},
},
{
.callback = dmi_low_memory_corruption,
.ident = "Phoenix BIOS",
.matches = {
DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
},
},
{
.callback = dmi_low_memory_corruption,
.ident = "Phoenix/MSC BIOS",
.matches = {
DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix/MSC"),
},
},
/*
* AMI BIOS with low memory corruption was found on Intel DG45ID and
* DG45FC boards.
* It has a different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
* match only DMI_BOARD_NAME and see if there is more bad products
* with this vendor.
*/
{
.callback = dmi_low_memory_corruption,
.ident = "AMI BIOS",
.matches = {
DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
},
},
{
.callback = dmi_low_memory_corruption,
.ident = "AMI BIOS",
.matches = {
DMI_MATCH(DMI_BOARD_NAME, "DG45FC"),
},
},
/*
* The Dell Inspiron Mini 1012 has DMI_BIOS_VENDOR = "Dell Inc.", so
* match on the product name.
*/
{
.callback = dmi_low_memory_corruption,
.ident = "Phoenix BIOS",
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
},
},
#endif
{}
};
static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
static void __init trim_bios_range(void)
{
@@ -699,8 +627,14 @@ static void __init trim_bios_range(void)
* A special case is the first 4Kb of memory;
* This is a BIOS owned area, not kernel ram, but generally
* not listed as such in the E820 table.
*
* This typically reserves additional memory (64KiB by default)
* since some BIOSes are known to corrupt low memory. See the
* Kconfig help text for X86_RESERVE_LOW.
*/
e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
E820_RAM, E820_RESERVED);
/*
* special case: Some BIOSen report the PC BIOS
* area (640->1Mb) as ram even though it is not.
@@ -710,6 +644,28 @@ static void __init trim_bios_range(void)
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
}
static int __init parse_reservelow(char *p)
{
unsigned long long size;
if (!p)
return -EINVAL;
size = memparse(p, &p);
if (size < 4096)
size = 4096;
if (size > 640*1024)
size = 640*1024;
reserve_low = size;
return 0;
}
early_param("reservelow", parse_reservelow);
/*
* Determine if we were loaded by an EFI loader. If so, then we have also been
* passed the efi memmap, systab, etc., so we should use these data structures
@@ -865,8 +821,6 @@ void __init setup_arch(char **cmdline_p)
dmi_scan_machine();
dmi_check_system(bad_bios_dmi_table);
/*
* VMware detection requires dmi to be available, so this
* needs to be done after dmi_scan_machine, for the BP.