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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 | #include <linux/slab.h> | |
31 | ||
32 | #include <asm/setup.h> | |
33 | #include <asm/page.h> | |
34 | #include <asm/e820.h> | |
35 | #include <asm/pgtable.h> | |
36 | #include <asm/tlbflush.h> | |
37 | #include <asm/proto.h> | |
38 | #include <asm/efi.h> | |
39 | #include <asm/cacheflush.h> | |
40 | #include <asm/fixmap.h> | |
41 | ||
42 | static pgd_t *save_pgd __initdata; | |
43 | static unsigned long efi_flags __initdata; | |
44 | ||
45 | static void __init early_code_mapping_set_exec(int executable) | |
46 | { | |
47 | efi_memory_desc_t *md; | |
48 | void *p; | |
49 | ||
50 | if (!(__supported_pte_mask & _PAGE_NX)) | |
51 | return; | |
52 | ||
53 | /* Make EFI service code area executable */ | |
54 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
55 | md = p; | |
56 | if (md->type == EFI_RUNTIME_SERVICES_CODE || | |
57 | md->type == EFI_BOOT_SERVICES_CODE) | |
58 | efi_set_executable(md, executable); | |
59 | } | |
60 | } | |
61 | ||
62 | void __init efi_call_phys_prelog(void) | |
63 | { | |
64 | unsigned long vaddress; | |
65 | int pgd; | |
66 | int n_pgds; | |
67 | ||
68 | early_code_mapping_set_exec(1); | |
69 | local_irq_save(efi_flags); | |
70 | ||
71 | n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE); | |
72 | save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL); | |
73 | ||
74 | for (pgd = 0; pgd < n_pgds; pgd++) { | |
75 | save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE); | |
76 | vaddress = (unsigned long)__va(pgd * PGDIR_SIZE); | |
77 | set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress)); | |
78 | } | |
79 | __flush_tlb_all(); | |
80 | } | |
81 | ||
82 | void __init efi_call_phys_epilog(void) | |
83 | { | |
84 | /* | |
85 | * After the lock is released, the original page table is restored. | |
86 | */ | |
87 | int pgd; | |
88 | int n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE); | |
89 | for (pgd = 0; pgd < n_pgds; pgd++) | |
90 | set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), save_pgd[pgd]); | |
91 | kfree(save_pgd); | |
92 | __flush_tlb_all(); | |
93 | local_irq_restore(efi_flags); | |
94 | early_code_mapping_set_exec(0); | |
95 | } | |
96 | ||
97 | void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size, | |
98 | u32 type, u64 attribute) | |
99 | { | |
100 | unsigned long last_map_pfn; | |
101 | ||
102 | if (type == EFI_MEMORY_MAPPED_IO) | |
103 | return ioremap(phys_addr, size); | |
104 | ||
105 | last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size); | |
106 | if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) { | |
107 | unsigned long top = last_map_pfn << PAGE_SHIFT; | |
108 | efi_ioremap(top, size - (top - phys_addr), type, attribute); | |
109 | } | |
110 | ||
111 | if (!(attribute & EFI_MEMORY_WB)) | |
112 | efi_memory_uc((u64)(unsigned long)__va(phys_addr), size); | |
113 | ||
114 | return (void __iomem *)__va(phys_addr); | |
115 | } |