projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Extensible Firmware Interface | |
| 3 | * | |
| 4 | * Based on Extensible Firmware Interface Specification version 1.0 | |
| 5 | * | |
| 6 | * Copyright (C) 1999 VA Linux Systems | |
| 7 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
| 8 | * Copyright (C) 1999-2002 Hewlett-Packard Co. | |
| 9 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
| 10 | * Stephane Eranian <eranian@hpl.hp.com> | |
| 11 | * | |
| 12 | * All EFI Runtime Services are not implemented yet as EFI only | |
| 13 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
| 14 | * in a future version. --drummond 1999-07-20 | |
| 15 | * | |
| 16 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
| 17 | * | |
| 18 | * Goutham Rao: <goutham.rao@intel.com> | |
| 19 | * Skip non-WB memory and ignore empty memory ranges. | |
| 20 | */ | |
| 21 | ||
| 1da177e4 | 22 | #include <linux/kernel.h> |
| 1da177e4 | 23 | #include <linux/types.h> |
| 1da177e4 | 24 | #include <linux/ioport.h> |
| 1da177e4 LT |
25 | #include <linux/efi.h> |
| 26 | ||
| 1da177e4 | 27 | #include <asm/io.h> |
| 783ac47c | 28 | #include <asm/desc.h> |
| 1da177e4 LT |
29 | #include <asm/page.h> |
| 30 | #include <asm/pgtable.h> | |
| 1da177e4 | 31 | #include <asm/tlbflush.h> |
| cc7e73f3 | 32 | #include <asm/efi.h> |
| 1da177e4 | 33 | |
| 1da177e4 LT |
34 | /* |
| 35 | * To make EFI call EFI runtime service in physical addressing mode we need | |
| 23a0d4e8 IM |
36 | * prolog/epilog before/after the invocation to claim the EFI runtime service |
| 37 | * handler exclusively and to duplicate a memory mapping in low memory space, | |
| 38 | * say 0 - 3G. | |
| 1da177e4 | 39 | */ |
| 1da177e4 | 40 | |
| 67a9108e MF |
41 | int __init efi_alloc_page_tables(void) |
| 42 | { | |
| 43 | return 0; | |
| 44 | } | |
| 45 | ||
| d2f7cbe7 | 46 | void efi_sync_low_kernel_mappings(void) {} |
| 11cc8512 | 47 | void __init efi_dump_pagetable(void) {} |
| 4e78eb05 | 48 | int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) |
| b7b898ae BP |
49 | { |
| 50 | return 0; | |
| 51 | } | |
| d2f7cbe7 BP |
52 | |
| 53 | void __init efi_map_region(efi_memory_desc_t *md) | |
| 54 | { | |
| 55 | old_map_region(md); | |
| 56 | } | |
| 57 | ||
| 3b266496 | 58 | void __init efi_map_region_fixed(efi_memory_desc_t *md) {} |
| 1fec0533 | 59 | void __init parse_efi_setup(u64 phys_addr, u32 data_len) {} |
| 3b266496 | 60 | |
| 744937b0 | 61 | pgd_t * __init efi_call_phys_prolog(void) |
| 1da177e4 | 62 | { |
| 6b68f01b | 63 | struct desc_ptr gdt_descr; |
| 744937b0 | 64 | pgd_t *save_pgd; |
| 1da177e4 | 65 | |
| 744937b0 IM |
66 | /* Current pgd is swapper_pg_dir, we'll restore it later: */ |
| 67 | save_pgd = swapper_pg_dir; | |
| 6d3e32e6 | 68 | load_cr3(initial_page_table); |
| 8b2cb7a8 | 69 | __flush_tlb_all(); |
| 1da177e4 | 70 | |
| 4fbb5968 RR |
71 | gdt_descr.address = __pa(get_cpu_gdt_table(0)); |
| 72 | gdt_descr.size = GDT_SIZE - 1; | |
| 73 | load_gdt(&gdt_descr); | |
| 744937b0 IM |
74 | |
| 75 | return save_pgd; | |
| 1da177e4 LT |
76 | } |
| 77 | ||
| 744937b0 | 78 | void __init efi_call_phys_epilog(pgd_t *save_pgd) |
| 1da177e4 | 79 | { |
| 6b68f01b | 80 | struct desc_ptr gdt_descr; |
| 1da177e4 | 81 | |
| 4fbb5968 RR |
82 | gdt_descr.address = (unsigned long)get_cpu_gdt_table(0); |
| 83 | gdt_descr.size = GDT_SIZE - 1; | |
| 84 | load_gdt(&gdt_descr); | |
| 2b932f6c | 85 | |
| 744937b0 | 86 | load_cr3(save_pgd); |
| 8b2cb7a8 | 87 | __flush_tlb_all(); |
| 1da177e4 | 88 | } |
| c55d016f | 89 | |
| 6d0cc887 | 90 | void __init efi_runtime_update_mappings(void) |
| c55d016f BP |
91 | { |
| 92 | if (__supported_pte_mask & _PAGE_NX) | |
| 93 | runtime_code_page_mkexec(); | |
| 94 | } |