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x86/efi: Add a wrapper function efi_map_region_fixed()

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Kexec kernel will use saved runtime virtual mapping, so add a new
function efi_map_region_fixed() for directly mapping a md to md->virt.

The md is passed in from 1st kernel, the virtual addr is saved in
md->virt_addr.

Signed-off-by: Dave Young <dyoung@redhat.com>
Acked-by: Borislav Petkov <bp@suse.de>
Tested-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Dave Young 2013-12-20 18:02:14 +08:00 committed by Matt Fleming
parent 2da6e57cce
commit 3b2664964b
3 changed files with 13 additions and 0 deletions
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1
arch/x86/include/asm/efi.h
View file

@ -128,6 +128,7 @@ extern void efi_call_phys_epilog(void);
extern void efi_unmap_memmap(void);
extern void efi_memory_uc(u64 addr, unsigned long size);
extern void __init efi_map_region(efi_memory_desc_t *md);
extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
extern void efi_sync_low_kernel_mappings(void);
extern void efi_setup_page_tables(void);
extern void __init old_map_region(efi_memory_desc_t *md);

2
arch/x86/platform/efi/efi_32.c
View file

@ -47,6 +47,8 @@ void __init efi_map_region(efi_memory_desc_t *md)
old_map_region(md);
}
void __init efi_map_region_fixed(efi_memory_desc_t *md) {}
void efi_call_phys_prelog(void)
{
struct desc_ptr gdt_descr;

10
arch/x86/platform/efi/efi_64.c
View file

@ -199,6 +199,16 @@ void __init efi_map_region(efi_memory_desc_t *md)
md->virt_addr = efi_va;
}
/*
* kexec kernel will use efi_map_region_fixed to map efi runtime memory ranges.
* md->virt_addr is the original virtual address which had been mapped in kexec
* 1st kernel.
*/
void __init efi_map_region_fixed(efi_memory_desc_t *md)
{
__map_region(md, md->virt_addr);
}
void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
u32 type, u64 attribute)
{