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authorPaul Jackson <pj@sgi.com>2008-06-22 18:22:07 +0400
committerIngo Molnar <mingo@elte.hu>2008-07-08 14:51:26 +0400
commitc4ba1320b7075e9ce33ad0afaef43ba13260b4c2 (patch)
treed9c3aa07da17153d4ac8489daf10dbc48e2220b1 /include/asm-x86/e820.h
parent05486fa7e631a3be31a0bbc5a575a389a1609e94 (diff)
downloadlinux-c4ba1320b7075e9ce33ad0afaef43ba13260b4c2.tar.xz
x86 boot: allow overlapping early reserve memory ranges
Add support for overlapping early memory reservations. In general, they still can't overlap, and will panic with "Overlapping early reservations" if they do overlap. But if a memory range is reserved with the new call: reserve_early_overlap_ok() rather than with the usual call: reserve_early() then subsequent early reservations are allowed to overlap. This new reserve_early_overlap_ok() call is only used in one place so far, which is the "BIOS reserved" reservation for the the EBDA region, which out of Paranoia reserves more than what the BIOS might have specified, and which thus might overlap with another legitimate early memory reservation (such as, perhaps, the EFI memmap.) 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>
Diffstat (limited to 'include/asm-x86/e820.h')
-rw-r--r--include/asm-x86/e820.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86/e820.h b/include/asm-x86/e820.h
index 7c32df07bae4..13fa5a076aa2 100644
--- a/include/asm-x86/e820.h
+++ b/include/asm-x86/e820.h
@@ -88,6 +88,7 @@ extern unsigned long end_user_pfn;
extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
extern void reserve_early(u64 start, u64 end, char *name);
+extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
extern void free_early(u64 start, u64 end);
extern void early_res_to_bootmem(u64 start, u64 end);
extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);