Kexec kernel will use saved runtime virtual mapping, so add a
new function efi_remap_region to remapping it directly without
calculate the virt addr from efi_va.
The md is passed in from 1st kernel, the virtual addr is
saved in md->virt_addr.
Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
---
arch/x86/include/asm/efi.h | 1 +
arch/x86/platform/efi/efi_32.c | 3 +++
arch/x86/platform/efi/efi_64.c | 19 +++++++++++++++++++
3 files changed, 23 insertions(+)
--- linux-2.6.orig/arch/x86/include/asm/efi.h
+++ linux-2.6/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);
--- linux-2.6.orig/arch/x86/platform/efi/efi_64.c
+++ linux-2.6/arch/x86/platform/efi/efi_64.c
@@ -203,6 +203,25 @@ 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)
+{
+ pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
+ unsigned long pf = 0;
+
+ if (!(md->attribute & EFI_MEMORY_WB))
+ pf |= _PAGE_PCD;
+
+ if (kernel_map_pages_in_pgd(pgd, md->phys_addr, md->virt_addr,
+ md->num_pages, pf))
+ pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
+ md->phys_addr, md->virt_addr);
+}
+
void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
u32 type, u64 attribute)
{
--- linux-2.6.orig/arch/x86/platform/efi/efi_32.c
+++ linux-2.6/arch/x86/platform/efi/efi_32.c
@@ -47,6 +47,9 @@ 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;
--
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