[patch 2/9 v3] efi: add a wrapper function efi_map_region_fixed

dyoung
2013-11-21T06:19:08Z

[-- Attachment #1: 02-efi-map-fixed-addr.patch --]
[-- Type: text/plain, Size: 1859 bytes --]

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.

Matt: coding style
reuse __map_region

Signed-off-by: Dave Young <dyoung@redhat.com>
---
arch/x86/include/asm/efi.h | 1 +
arch/x86/platform/efi/efi_32.c | 2 ++
arch/x86/platform/efi/efi_64.c | 10 ++++++++++
3 files changed, 13 insertions(+)

--- efi.orig/arch/x86/include/asm/efi.h
+++ efi/arch/x86/include/asm/efi.h
@@ -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);
--- efi.orig/arch/x86/platform/efi/efi_64.c
+++ efi/arch/x86/platform/efi/efi_64.c
@@ -199,6 +199,16 @@ void __init efi_map_region(efi_memory_de
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)
{
--- efi.orig/arch/x86/platform/efi/efi_32.c
+++ efi/arch/x86/platform/efi/efi_32.c
@@ -47,6 +47,8 @@ void __init efi_map_region(efi_memory_de
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;