Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Extensible Firmware Interface | |
4 | * | |
5 | * Based on Extensible Firmware Interface Specification version 1.0 | |
6 | * | |
7 | * Copyright (C) 1999 VA Linux Systems | |
8 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
9 | * Copyright (C) 1999-2002 Hewlett-Packard Co. | |
10 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
11 | * Stephane Eranian <eranian@hpl.hp.com> | |
12 | * | |
13 | * All EFI Runtime Services are not implemented yet as EFI only | |
14 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
15 | * in a future version. --drummond 1999-07-20 | |
16 | * | |
17 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
18 | * | |
19 | * Goutham Rao: <goutham.rao@intel.com> | |
20 | * Skip non-WB memory and ignore empty memory ranges. | |
21 | */ | |
22 | ||
1da177e4 | 23 | #include <linux/kernel.h> |
1da177e4 | 24 | #include <linux/types.h> |
1da177e4 | 25 | #include <linux/ioport.h> |
1da177e4 LT |
26 | #include <linux/efi.h> |
27 | ||
1da177e4 | 28 | #include <asm/io.h> |
783ac47c | 29 | #include <asm/desc.h> |
1da177e4 LT |
30 | #include <asm/page.h> |
31 | #include <asm/pgtable.h> | |
1da177e4 | 32 | #include <asm/tlbflush.h> |
cc7e73f3 | 33 | #include <asm/efi.h> |
1da177e4 | 34 | |
1da177e4 LT |
35 | /* |
36 | * To make EFI call EFI runtime service in physical addressing mode we need | |
23a0d4e8 IM |
37 | * prolog/epilog before/after the invocation to claim the EFI runtime service |
38 | * handler exclusively and to duplicate a memory mapping in low memory space, | |
39 | * say 0 - 3G. | |
1da177e4 | 40 | */ |
1da177e4 | 41 | |
67a9108e MF |
42 | int __init efi_alloc_page_tables(void) |
43 | { | |
44 | return 0; | |
45 | } | |
46 | ||
d2f7cbe7 | 47 | void efi_sync_low_kernel_mappings(void) {} |
ac81d3de SP |
48 | |
49 | void __init efi_dump_pagetable(void) | |
50 | { | |
51 | #ifdef CONFIG_EFI_PGT_DUMP | |
52 | ptdump_walk_pgd_level(NULL, swapper_pg_dir); | |
53 | #endif | |
54 | } | |
55 | ||
4e78eb05 | 56 | int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) |
b7b898ae BP |
57 | { |
58 | return 0; | |
59 | } | |
d2f7cbe7 BP |
60 | |
61 | void __init efi_map_region(efi_memory_desc_t *md) | |
62 | { | |
63 | old_map_region(md); | |
64 | } | |
65 | ||
3b266496 | 66 | void __init efi_map_region_fixed(efi_memory_desc_t *md) {} |
1fec0533 | 67 | void __init parse_efi_setup(u64 phys_addr, u32 data_len) {} |
3b266496 | 68 | |
744937b0 | 69 | pgd_t * __init efi_call_phys_prolog(void) |
1da177e4 | 70 | { |
6b68f01b | 71 | struct desc_ptr gdt_descr; |
744937b0 | 72 | pgd_t *save_pgd; |
1da177e4 | 73 | |
744937b0 IM |
74 | /* Current pgd is swapper_pg_dir, we'll restore it later: */ |
75 | save_pgd = swapper_pg_dir; | |
6d3e32e6 | 76 | load_cr3(initial_page_table); |
8b2cb7a8 | 77 | __flush_tlb_all(); |
1da177e4 | 78 | |
3fa1cabb | 79 | gdt_descr.address = get_cpu_gdt_paddr(0); |
4fbb5968 RR |
80 | gdt_descr.size = GDT_SIZE - 1; |
81 | load_gdt(&gdt_descr); | |
744937b0 IM |
82 | |
83 | return save_pgd; | |
1da177e4 LT |
84 | } |
85 | ||
744937b0 | 86 | void __init efi_call_phys_epilog(pgd_t *save_pgd) |
1da177e4 | 87 | { |
6b68f01b | 88 | struct desc_ptr gdt_descr; |
1da177e4 | 89 | |
69218e47 | 90 | gdt_descr.address = (unsigned long)get_cpu_gdt_rw(0); |
4fbb5968 RR |
91 | gdt_descr.size = GDT_SIZE - 1; |
92 | load_gdt(&gdt_descr); | |
2b932f6c | 93 | |
744937b0 | 94 | load_cr3(save_pgd); |
8b2cb7a8 | 95 | __flush_tlb_all(); |
1da177e4 | 96 | } |
c55d016f | 97 | |
6d0cc887 | 98 | void __init efi_runtime_update_mappings(void) |
c55d016f BP |
99 | { |
100 | if (__supported_pte_mask & _PAGE_NX) | |
101 | runtime_code_page_mkexec(); | |
102 | } |