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| author | Andi Kleen <ak@suse.de> | 2006-03-25 18:30:22 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-25 20:10:55 +0300 |
| commit | f2d3efedbecc04dc348d723e4c90b46731b3bb48 (patch) | |
| tree | 982c7838a97a5c2420de392e5a36f49eaa1778b0 /arch/x86_64/mm | |
| parent | f083a329e63d471a5e9238e837772b1b76c218db (diff) | |
| download | linux-f2d3efedbecc04dc348d723e4c90b46731b3bb48.tar.xz | |
[PATCH] x86_64: Implement early DMI scanning
There are more and more cases where we need to know DMI information
early to work around bugs. i386 already had early DMI scanning, but
x86-64 didn't. Implement this now.
This required some cleanup in the i386 code.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/mm')
| -rw-r--r-- | arch/x86_64/mm/init.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c index 675a45691338..54c7f5975b44 100644 --- a/arch/x86_64/mm/init.c +++ b/arch/x86_64/mm/init.c @@ -225,6 +225,33 @@ static __meminit void unmap_low_page(int i) ti->allocated = 0; } +/* Must run before zap_low_mappings */ +__init void *early_ioremap(unsigned long addr, unsigned long size) +{ + unsigned long map = round_down(addr, LARGE_PAGE_SIZE); + + /* actually usually some more */ + if (size >= LARGE_PAGE_SIZE) { + printk("SMBIOS area too long %lu\n", size); + return NULL; + } + set_pmd(temp_mappings[0].pmd, __pmd(map | _KERNPG_TABLE | _PAGE_PSE)); + map += LARGE_PAGE_SIZE; + set_pmd(temp_mappings[1].pmd, __pmd(map | _KERNPG_TABLE | _PAGE_PSE)); + __flush_tlb(); + return temp_mappings[0].address + (addr & (LARGE_PAGE_SIZE-1)); +} + +/* To avoid virtual aliases later */ +__init void early_iounmap(void *addr, unsigned long size) +{ + if ((void *)round_down((unsigned long)addr, LARGE_PAGE_SIZE) != temp_mappings[0].address) + printk("early_iounmap: bad address %p\n", addr); + set_pmd(temp_mappings[0].pmd, __pmd(0)); + set_pmd(temp_mappings[1].pmd, __pmd(0)); + __flush_tlb(); +} + static void __meminit phys_pmd_init(pmd_t *pmd, unsigned long address, unsigned long end) { |