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Commit | Line | Data |
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700efc1b EB |
1 | /* |
2 | * linux/arch/i386/kernel/head32.c -- prepare to run common code | |
3 | * | |
4 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE | |
5 | * Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com> | |
6 | */ | |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/start_kernel.h> | |
c967da6a | 10 | #include <linux/mm.h> |
72d7c3b3 | 11 | #include <linux/memblock.h> |
700efc1b | 12 | |
87e81786 | 13 | #include <asm/desc.h> |
a4c81cf6 YL |
14 | #include <asm/setup.h> |
15 | #include <asm/sections.h> | |
66441bd3 | 16 | #include <asm/e820/api.h> |
816c25e7 | 17 | #include <asm/page.h> |
de934103 TG |
18 | #include <asm/apic.h> |
19 | #include <asm/io_apic.h> | |
47a3d5da | 20 | #include <asm/bios_ebda.h> |
b40827fa | 21 | #include <asm/tlbflush.h> |
5dcd14ec | 22 | #include <asm/bootparam_utils.h> |
47a3d5da TG |
23 | |
24 | static void __init i386_default_early_setup(void) | |
25 | { | |
421f91d2 | 26 | /* Initialize 32bit specific setup functions */ |
47a3d5da TG |
27 | x86_init.resources.reserve_resources = i386_reserve_resources; |
28 | x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc; | |
47a3d5da | 29 | } |
a4c81cf6 | 30 | |
2605fc21 | 31 | asmlinkage __visible void __init i386_start_kernel(void) |
700efc1b | 32 | { |
1e02ce4c | 33 | cr4_init_shadow(); |
87e81786 TG |
34 | |
35 | idt_setup_early_handler(); | |
36 | ||
5dcd14ec PA |
37 | sanitize_boot_params(&boot_params); |
38 | ||
8d152e7a LR |
39 | x86_early_init_platform_quirks(); |
40 | ||
47a3d5da TG |
41 | /* Call the subarch specific early setup function */ |
42 | switch (boot_params.hdr.hardware_subarch) { | |
712b6aa8 KS |
43 | case X86_SUBARCH_INTEL_MID: |
44 | x86_intel_mid_early_setup(); | |
3f4110a4 | 45 | break; |
c751e17b TG |
46 | case X86_SUBARCH_CE4100: |
47 | x86_ce4100_early_setup(); | |
48 | break; | |
47a3d5da TG |
49 | default: |
50 | i386_default_early_setup(); | |
51 | break; | |
52 | } | |
a4c81cf6 | 53 | |
700efc1b EB |
54 | start_kernel(); |
55 | } | |
1e620f9b BO |
56 | |
57 | /* | |
58 | * Initialize page tables. This creates a PDE and a set of page | |
59 | * tables, which are located immediately beyond __brk_base. The variable | |
60 | * _brk_end is set up to point to the first "safe" location. | |
61 | * Mappings are created both at virtual address 0 (identity mapping) | |
62 | * and PAGE_OFFSET for up to _end. | |
63 | * | |
64 | * In PAE mode initial_page_table is statically defined to contain | |
65 | * enough entries to cover the VMSPLIT option (that is the top 1, 2 or 3 | |
66 | * entries). The identity mapping is handled by pointing two PGD entries | |
67 | * to the first kernel PMD. Note the upper half of each PMD or PTE are | |
68 | * always zero at this stage. | |
69 | */ | |
70 | void __init mk_early_pgtbl_32(void) | |
71 | { | |
72 | #ifdef __pa | |
73 | #undef __pa | |
74 | #endif | |
75 | #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET) | |
76 | pte_t pte, *ptep; | |
77 | int i; | |
78 | unsigned long *ptr; | |
79 | /* Enough space to fit pagetables for the low memory linear map */ | |
80 | const unsigned long limit = __pa(_end) + | |
81 | (PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT); | |
82 | #ifdef CONFIG_X86_PAE | |
83 | pmd_t pl2, *pl2p = (pmd_t *)__pa(initial_pg_pmd); | |
84 | #define SET_PL2(pl2, val) { (pl2).pmd = (val); } | |
85 | #else | |
86 | pgd_t pl2, *pl2p = (pgd_t *)__pa(initial_page_table); | |
87 | #define SET_PL2(pl2, val) { (pl2).pgd = (val); } | |
88 | #endif | |
89 | ||
90 | ptep = (pte_t *)__pa(__brk_base); | |
91 | pte.pte = PTE_IDENT_ATTR; | |
92 | ||
93 | while ((pte.pte & PTE_PFN_MASK) < limit) { | |
94 | ||
95 | SET_PL2(pl2, (unsigned long)ptep | PDE_IDENT_ATTR); | |
96 | *pl2p = pl2; | |
97 | #ifndef CONFIG_X86_PAE | |
98 | /* Kernel PDE entry */ | |
99 | *(pl2p + ((PAGE_OFFSET >> PGDIR_SHIFT))) = pl2; | |
100 | #endif | |
101 | for (i = 0; i < PTRS_PER_PTE; i++) { | |
102 | *ptep = pte; | |
103 | pte.pte += PAGE_SIZE; | |
104 | ptep++; | |
105 | } | |
106 | ||
107 | pl2p++; | |
108 | } | |
109 | ||
110 | ptr = (unsigned long *)__pa(&max_pfn_mapped); | |
111 | /* Can't use pte_pfn() since it's a call with CONFIG_PARAVIRT */ | |
112 | *ptr = (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT; | |
113 | ||
114 | ptr = (unsigned long *)__pa(&_brk_end); | |
115 | *ptr = (unsigned long)ptep + PAGE_OFFSET; | |
116 | } | |
117 |