Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=200001...
Commit: 200001eb140ea33477965f2050bea0dac801974b
Parent: 5dab8ec139be215fbaba216fb4aea914d0f4dac5
Author: Paul Jackson <pj@sgi.com>
AuthorDate: Wed Jun 25 05:44:46 2008 -0700
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Tue Jul 8 13:10:41 2008 +0200
x86 boot: only pick up additional EFI memmap if add_efi_memmap flag
Applies on top of the previous patch:
x86 boot: add code to add BIOS provided EFI memory entries to kernel
Instead of always adding EFI memory map entries (if present) to the
memory map after initially finding either E820 BIOS memory map entries
and/or kernel command line memmap entries, -instead- only add such
additional EFI memory map entries if the kernel boot option:
add_efi_memmap
is specified.
Requiring this 'add_efi_memmap' option is backward compatible with
kernels that didn't load such additional EFI memory map entries in
the first place, and it doesn't override a configuration that tries
to replace all E820 or EFI BIOS memory map entries with ones given
entirely on the kernel command line.
Signed-off-by: Paul Jackson <pj@sgi.com>
Cc: "Yinghai Lu" <yhlu.kernel@gmail.com>
Cc: "Jack Steiner" <steiner@sgi.com>
Cc: "Mike Travis" <travis@sgi.com>
Cc: "Huang
Cc: Ying" <ying.huang@intel.com>
Cc: "Andi Kleen" <andi@firstfloor.org>
Cc: "Andrew Morton" <akpm@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
Documentation/kernel-parameters.txt | 3 +++
Documentation/x86/x86_64/uefi.txt | 4 ++++
arch/x86/kernel/efi.c | 16 ++++++++++++++--
3 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index da13d6d..795c487 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2150,6 +2150,9 @@ and is between 256 and 4096 characters. It is defined in the file
usbhid.mousepoll=
[USBHID] The interval which mice are to be polled at.
+ add_efi_memmap [EFI; x86-32,X86-64] Include EFI memory map in
+ kernel's map of available physical RAM.
+
vdso= [X86-32,SH,x86-64]
vdso=2: enable compat VDSO (default with COMPAT_VDSO)
vdso=1: enable VDSO (default)
diff --git a/Documentation/x86/x86_64/uefi.txt b/Documentation/x86/x86_64/uefi.txt
index 7d77120..a5e2b4f 100644
--- a/Documentation/x86/x86_64/uefi.txt
+++ b/Documentation/x86/x86_64/uefi.txt
@@ -36,3 +36,7 @@ Mechanics:
services.
noefi turn off all EFI runtime services
reboot_type=k turn off EFI reboot runtime service
+- If the EFI memory map has additional entries not in the E820 map,
+ you can include those entries in the kernels memory map of available
+ physical RAM by using the following kernel command line parameter.
+ add_efi_memmap include EFI memory map of available physical RAM
diff --git a/arch/x86/kernel/efi.c b/arch/x86/kernel/efi.c
index a03ca36..94382fa 100644
--- a/arch/x86/kernel/efi.c
+++ b/arch/x86/kernel/efi.c
@@ -64,6 +64,17 @@ static int __init setup_noefi(char *arg)
}
early_param("noefi", setup_noefi);
+int add_efi_memmap;
+EXPORT_SYMBOL(add_efi_memmap);
+
+static int __init setup_add_efi_memmap(char *arg)
+{
+ add_efi_memmap = 1;
+ return 0;
+}
+early_param("add_efi_memmap", setup_add_efi_memmap);
+
+
static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
return efi_call_virt2(get_time, tm, tc);
@@ -219,7 +230,7 @@ unsigned long efi_get_time(void)
* (zeropage) memory map.
*/
-static void __init add_efi_memmap(void)
+static void __init do_add_efi_memmap(void)
{
void *p;
@@ -406,7 +417,8 @@ void __init efi_init(void)
if (memmap.desc_size != sizeof(efi_memory_desc_t))
printk(KERN_WARNING "Kernel-defined memdesc"
"doesn't match the one from EFI!\n");
- add_efi_memmap();
+ if (add_efi_memmap)
+ do_add_efi_memmap();
/* Setup for EFI runtime service */
reboot_type = BOOT_EFI;
--
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