From f2d3efedbecc04dc348d723e4c90b46731b3bb48 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Sat, 25 Mar 2006 16:30:22 +0100 Subject: [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 Signed-off-by: Linus Torvalds --- arch/x86_64/mm/init.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'arch/x86_64/mm/init.c') diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c index 675a4569133..54c7f5975b4 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) { -- cgit v1.2.3