Commit | Line | Data |
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5b83683f HY |
1 | /* |
2 | * x86_64 specific EFI support functions | |
3 | * Based on Extensible Firmware Interface Specification version 1.0 | |
4 | * | |
5 | * Copyright (C) 2005-2008 Intel Co. | |
6 | * Fenghua Yu <fenghua.yu@intel.com> | |
7 | * Bibo Mao <bibo.mao@intel.com> | |
8 | * Chandramouli Narayanan <mouli@linux.intel.com> | |
9 | * Huang Ying <ying.huang@intel.com> | |
10 | * | |
11 | * Code to convert EFI to E820 map has been implemented in elilo bootloader | |
12 | * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table | |
13 | * is setup appropriately for EFI runtime code. | |
14 | * - mouli 06/14/2007. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/bootmem.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/efi.h> | |
27 | #include <linux/uaccess.h> | |
28 | #include <linux/io.h> | |
29 | #include <linux/reboot.h> | |
30 | ||
31 | #include <asm/setup.h> | |
32 | #include <asm/page.h> | |
33 | #include <asm/e820.h> | |
34 | #include <asm/pgtable.h> | |
35 | #include <asm/tlbflush.h> | |
5b83683f HY |
36 | #include <asm/proto.h> |
37 | #include <asm/efi.h> | |
4de0d4a6 | 38 | #include <asm/cacheflush.h> |
3819cd48 | 39 | #include <asm/fixmap.h> |
5b83683f HY |
40 | |
41 | static pgd_t save_pgd __initdata; | |
42 | static unsigned long efi_flags __initdata; | |
43 | ||
5b83683f HY |
44 | static void __init early_mapping_set_exec(unsigned long start, |
45 | unsigned long end, | |
46 | int executable) | |
47 | { | |
4de0d4a6 HY |
48 | unsigned long num_pages; |
49 | ||
50 | start &= PMD_MASK; | |
51 | end = (end + PMD_SIZE - 1) & PMD_MASK; | |
52 | num_pages = (end - start) >> PAGE_SHIFT; | |
53 | if (executable) | |
54 | set_memory_x((unsigned long)__va(start), num_pages); | |
55 | else | |
56 | set_memory_nx((unsigned long)__va(start), num_pages); | |
5b83683f HY |
57 | } |
58 | ||
59 | static void __init early_runtime_code_mapping_set_exec(int executable) | |
60 | { | |
61 | efi_memory_desc_t *md; | |
62 | void *p; | |
63 | ||
a2172e25 HY |
64 | if (!(__supported_pte_mask & _PAGE_NX)) |
65 | return; | |
66 | ||
5b83683f HY |
67 | /* Make EFI runtime service code area executable */ |
68 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
69 | md = p; | |
70 | if (md->type == EFI_RUNTIME_SERVICES_CODE) { | |
71 | unsigned long end; | |
4de0d4a6 | 72 | end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT); |
5b83683f HY |
73 | early_mapping_set_exec(md->phys_addr, end, executable); |
74 | } | |
75 | } | |
76 | } | |
77 | ||
78 | void __init efi_call_phys_prelog(void) | |
79 | { | |
80 | unsigned long vaddress; | |
81 | ||
5b83683f | 82 | early_runtime_code_mapping_set_exec(1); |
4de0d4a6 | 83 | local_irq_save(efi_flags); |
5b83683f | 84 | vaddress = (unsigned long)__va(0x0UL); |
b899c5ed | 85 | save_pgd = *pgd_offset_k(0x0UL); |
5b83683f HY |
86 | set_pgd(pgd_offset_k(0x0UL), *pgd_offset_k(vaddress)); |
87 | __flush_tlb_all(); | |
88 | } | |
89 | ||
90 | void __init efi_call_phys_epilog(void) | |
91 | { | |
92 | /* | |
93 | * After the lock is released, the original page table is restored. | |
94 | */ | |
95 | set_pgd(pgd_offset_k(0x0UL), save_pgd); | |
5b83683f HY |
96 | __flush_tlb_all(); |
97 | local_irq_restore(efi_flags); | |
4de0d4a6 | 98 | early_runtime_code_mapping_set_exec(0); |
5b83683f HY |
99 | } |
100 | ||
b25e31ce | 101 | void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size) |
5b83683f | 102 | { |
dd39ecf5 | 103 | unsigned long last_map_pfn; |
5b83683f | 104 | |
dd39ecf5 HY |
105 | last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size); |
106 | if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) | |
5b83683f HY |
107 | return NULL; |
108 | ||
dd39ecf5 | 109 | return (void __iomem *)__va(phys_addr); |
5b83683f | 110 | } |