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authorDave Young <dyoung@redhat.com>2013-12-20 11:02:14 +0100
committerMatt Fleming <matt.fleming@intel.com>2013-12-21 16:09:51 +0100
commit3b2664964bc886ae9d5127c8d3708b1acc0626d2 (patch)
treefd6e3d90de57bf7229bdfa1376e04e8cd55acbab /arch/x86/platform
parentx86/efi: Remove unused variables in __map_region() (diff)
downloadlinux-3b2664964bc886ae9d5127c8d3708b1acc0626d2.tar.xz
linux-3b2664964bc886ae9d5127c8d3708b1acc0626d2.zip
x86/efi: Add a wrapper function efi_map_region_fixed()
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>
Diffstat (limited to 'arch/x86/platform')
-rw-r--r--arch/x86/platform/efi/efi_32.c2
-rw-r--r--arch/x86/platform/efi/efi_64.c10
2 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c
index e94557cf5487..7b3ec6ed99af 100644
--- a/arch/x86/platform/efi/efi_32.c
+++ b/arch/x86/platform/efi/efi_32.c
@@ -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;
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index c5a6491d95da..ff08cb19630b 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -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)
{