aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/platform/efi/efi_64.c')
-rw-r--r--arch/x86/platform/efi/efi_64.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index ac3aa54e265..0fba86da589 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -38,7 +38,7 @@
38#include <asm/cacheflush.h> 38#include <asm/cacheflush.h>
39#include <asm/fixmap.h> 39#include <asm/fixmap.h>
40 40
41static pgd_t save_pgd __initdata; 41static pgd_t *save_pgd __initdata;
42static unsigned long efi_flags __initdata; 42static unsigned long efi_flags __initdata;
43 43
44static void __init early_code_mapping_set_exec(int executable) 44static void __init early_code_mapping_set_exec(int executable)
@@ -61,12 +61,20 @@ static void __init early_code_mapping_set_exec(int executable)
61void __init efi_call_phys_prelog(void) 61void __init efi_call_phys_prelog(void)
62{ 62{
63 unsigned long vaddress; 63 unsigned long vaddress;
64 int pgd;
65 int n_pgds;
64 66
65 early_code_mapping_set_exec(1); 67 early_code_mapping_set_exec(1);
66 local_irq_save(efi_flags); 68 local_irq_save(efi_flags);
67 vaddress = (unsigned long)__va(0x0UL); 69
68 save_pgd = *pgd_offset_k(0x0UL); 70 n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
69 set_pgd(pgd_offset_k(0x0UL), *pgd_offset_k(vaddress)); 71 save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL);
72
73 for (pgd = 0; pgd < n_pgds; pgd++) {
74 save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE);
75 vaddress = (unsigned long)__va(pgd * PGDIR_SIZE);
76 set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress));
77 }
70 __flush_tlb_all(); 78 __flush_tlb_all();
71} 79}
72 80
@@ -75,7 +83,11 @@ void __init efi_call_phys_epilog(void)
75 /* 83 /*
76 * After the lock is released, the original page table is restored. 84 * After the lock is released, the original page table is restored.
77 */ 85 */
78 set_pgd(pgd_offset_k(0x0UL), save_pgd); 86 int pgd;
87 int n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
88 for (pgd = 0; pgd < n_pgds; pgd++)
89 set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), save_pgd[pgd]);
90 kfree(save_pgd);
79 __flush_tlb_all(); 91 __flush_tlb_all();
80 local_irq_restore(efi_flags); 92 local_irq_restore(efi_flags);
81 early_code_mapping_set_exec(0); 93 early_code_mapping_set_exec(0);