6e15cf0486
Conflicts:
arch/parisc/kernel/irq.c
arch/x86/include/asm/fixmap_64.h
arch/x86/include/asm/setup.h
kernel/irq/handle.c
Semantic merge:
arch/x86/include/asm/fixmap.h
Signed-off-by: Ingo Molnar <mingo@elte.hu>
111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
/*
|
|
* x86_64 specific EFI support functions
|
|
* Based on Extensible Firmware Interface Specification version 1.0
|
|
*
|
|
* Copyright (C) 2005-2008 Intel Co.
|
|
* Fenghua Yu <fenghua.yu@intel.com>
|
|
* Bibo Mao <bibo.mao@intel.com>
|
|
* Chandramouli Narayanan <mouli@linux.intel.com>
|
|
* Huang Ying <ying.huang@intel.com>
|
|
*
|
|
* Code to convert EFI to E820 map has been implemented in elilo bootloader
|
|
* based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table
|
|
* is setup appropriately for EFI runtime code.
|
|
* - mouli 06/14/2007.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/types.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/module.h>
|
|
#include <linux/efi.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/io.h>
|
|
#include <linux/reboot.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/page.h>
|
|
#include <asm/e820.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/proto.h>
|
|
#include <asm/efi.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/fixmap.h>
|
|
|
|
static pgd_t save_pgd __initdata;
|
|
static unsigned long efi_flags __initdata;
|
|
|
|
static void __init early_mapping_set_exec(unsigned long start,
|
|
unsigned long end,
|
|
int executable)
|
|
{
|
|
unsigned long num_pages;
|
|
|
|
start &= PMD_MASK;
|
|
end = (end + PMD_SIZE - 1) & PMD_MASK;
|
|
num_pages = (end - start) >> PAGE_SHIFT;
|
|
if (executable)
|
|
set_memory_x((unsigned long)__va(start), num_pages);
|
|
else
|
|
set_memory_nx((unsigned long)__va(start), num_pages);
|
|
}
|
|
|
|
static void __init early_runtime_code_mapping_set_exec(int executable)
|
|
{
|
|
efi_memory_desc_t *md;
|
|
void *p;
|
|
|
|
if (!(__supported_pte_mask & _PAGE_NX))
|
|
return;
|
|
|
|
/* Make EFI runtime service code area executable */
|
|
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
|
|
md = p;
|
|
if (md->type == EFI_RUNTIME_SERVICES_CODE) {
|
|
unsigned long end;
|
|
end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
|
|
early_mapping_set_exec(md->phys_addr, end, executable);
|
|
}
|
|
}
|
|
}
|
|
|
|
void __init efi_call_phys_prelog(void)
|
|
{
|
|
unsigned long vaddress;
|
|
|
|
early_runtime_code_mapping_set_exec(1);
|
|
local_irq_save(efi_flags);
|
|
vaddress = (unsigned long)__va(0x0UL);
|
|
save_pgd = *pgd_offset_k(0x0UL);
|
|
set_pgd(pgd_offset_k(0x0UL), *pgd_offset_k(vaddress));
|
|
__flush_tlb_all();
|
|
}
|
|
|
|
void __init efi_call_phys_epilog(void)
|
|
{
|
|
/*
|
|
* After the lock is released, the original page table is restored.
|
|
*/
|
|
set_pgd(pgd_offset_k(0x0UL), save_pgd);
|
|
__flush_tlb_all();
|
|
local_irq_restore(efi_flags);
|
|
early_runtime_code_mapping_set_exec(0);
|
|
}
|
|
|
|
void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size)
|
|
{
|
|
unsigned long last_map_pfn;
|
|
|
|
last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
|
|
if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size)
|
|
return NULL;
|
|
|
|
return (void __iomem *)__va(phys_addr);
|
|
}
|