e1ad783b12
This hangs my MacBook Air at boot time; I get no console
messages at all. I reverted this on top of -rc5 and my machine
boots again.
This reverts commit e8c7106280.
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Huang Ying <huang.ying.caritas@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1321621751-3650-1-git-send-email-matt@console
Signed-off-by: Ingo Molnar <mingo@elte.hu>
100 lines
2.5 KiB
C
100 lines
2.5 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_code_mapping_set_exec(int executable)
|
|
{
|
|
efi_memory_desc_t *md;
|
|
void *p;
|
|
|
|
if (!(__supported_pte_mask & _PAGE_NX))
|
|
return;
|
|
|
|
/* Make EFI 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 ||
|
|
md->type == EFI_BOOT_SERVICES_CODE)
|
|
efi_set_executable(md, executable);
|
|
}
|
|
}
|
|
|
|
void __init efi_call_phys_prelog(void)
|
|
{
|
|
unsigned long vaddress;
|
|
|
|
early_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_code_mapping_set_exec(0);
|
|
}
|
|
|
|
void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
|
|
u32 type)
|
|
{
|
|
unsigned long last_map_pfn;
|
|
|
|
if (type == EFI_MEMORY_MAPPED_IO)
|
|
return ioremap(phys_addr, size);
|
|
|
|
last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
|
|
if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
|
|
unsigned long top = last_map_pfn << PAGE_SHIFT;
|
|
efi_ioremap(top, size - (top - phys_addr), type);
|
|
}
|
|
|
|
return (void __iomem *)__va(phys_addr);
|
|
}
|