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x86: fix EFI mapping

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The patch updates EFI runtime memory mapping code, by making EFI
areas explicitly executable.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Huang, Ying
2008-02-04 16:48:06 +01:00
committed by Ingo Molnar
parent f56d005d30
commit 1c083eb2cb
3 changed files with 43 additions and 40 deletions
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57
arch/x86/kernel/efi.c
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@ -379,11 +379,9 @@ void __init efi_init(void)
#endif
}
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
static void __init runtime_code_page_mkexec(void)
{
efi_memory_desc_t *md;
unsigned long end;
void *p;
if (!(__supported_pte_mask & _PAGE_NX))
@ -392,18 +390,13 @@ static void __init runtime_code_page_mkexec(void)
/* Make EFI runtime service code area executable */
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
if (md->type == EFI_RUNTIME_SERVICES_CODE &&
(end >> PAGE_SHIFT) <= max_pfn_mapped) {
set_memory_x(md->virt_addr, md->num_pages);
set_memory_uc(md->virt_addr, md->num_pages);
}
if (md->type != EFI_RUNTIME_SERVICES_CODE)
continue;
set_memory_x(md->virt_addr, md->num_pages << EFI_PAGE_SHIFT);
}
__flush_tlb_all();
}
#else
static inline void __init runtime_code_page_mkexec(void) { }
#endif
/*
* This function will switch the EFI runtime services to virtual mode.
@ -417,30 +410,40 @@ void __init efi_enter_virtual_mode(void)
{
efi_memory_desc_t *md;
efi_status_t status;
unsigned long end;
void *p;
unsigned long size;
u64 end, systab;
void *p, *va;
efi.systab = NULL;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
if ((md->attribute & EFI_MEMORY_WB) &&
((end >> PAGE_SHIFT) <= max_pfn_mapped))
md->virt_addr = (unsigned long)__va(md->phys_addr);
size = md->num_pages << EFI_PAGE_SHIFT;
end = md->phys_addr + size;
if ((end >> PAGE_SHIFT) <= max_pfn_mapped)
va = __va(md->phys_addr);
else
md->virt_addr = (unsigned long)
efi_ioremap(md->phys_addr,
md->num_pages << EFI_PAGE_SHIFT);
if (!md->virt_addr)
va = efi_ioremap(md->phys_addr, size);
if (md->attribute & EFI_MEMORY_WB)
set_memory_uc(md->virt_addr, size);
md->virt_addr = (u64) (unsigned long) va;
if (!va) {
printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
(unsigned long long)md->phys_addr);
if ((md->phys_addr <= (unsigned long)efi_phys.systab) &&
((unsigned long)efi_phys.systab < end))
efi.systab = (efi_system_table_t *)(unsigned long)
(md->virt_addr - md->phys_addr +
(unsigned long)efi_phys.systab);
continue;
}
systab = (u64) (unsigned long) efi_phys.systab;
if (md->phys_addr <= systab && systab < end) {
systab += md->virt_addr - md->phys_addr;
efi.systab = (efi_system_table_t *) (unsigned long) systab;
}
}
BUG_ON(!efi.systab);