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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
700efc1b EB |
2 | /* |
3 | * linux/arch/i386/kernel/head32.c -- prepare to run common code | |
4 | * | |
5 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE | |
6 | * Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com> | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/start_kernel.h> | |
c967da6a | 11 | #include <linux/mm.h> |
72d7c3b3 | 12 | #include <linux/memblock.h> |
700efc1b | 13 | |
87e81786 | 14 | #include <asm/desc.h> |
a4c81cf6 YL |
15 | #include <asm/setup.h> |
16 | #include <asm/sections.h> | |
66441bd3 | 17 | #include <asm/e820/api.h> |
816c25e7 | 18 | #include <asm/page.h> |
de934103 TG |
19 | #include <asm/apic.h> |
20 | #include <asm/io_apic.h> | |
47a3d5da | 21 | #include <asm/bios_ebda.h> |
b40827fa | 22 | #include <asm/tlbflush.h> |
5dcd14ec | 23 | #include <asm/bootparam_utils.h> |
47a3d5da TG |
24 | |
25 | static void __init i386_default_early_setup(void) | |
26 | { | |
421f91d2 | 27 | /* Initialize 32bit specific setup functions */ |
47a3d5da TG |
28 | x86_init.resources.reserve_resources = i386_reserve_resources; |
29 | x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc; | |
47a3d5da | 30 | } |
a4c81cf6 | 31 | |
2605fc21 | 32 | asmlinkage __visible void __init i386_start_kernel(void) |
700efc1b | 33 | { |
9c48c096 | 34 | /* Make sure IDT is set up before any exception happens */ |
87e81786 TG |
35 | idt_setup_early_handler(); |
36 | ||
9c48c096 TG |
37 | cr4_init_shadow(); |
38 | ||
5dcd14ec PA |
39 | sanitize_boot_params(&boot_params); |
40 | ||
8d152e7a LR |
41 | x86_early_init_platform_quirks(); |
42 | ||
47a3d5da TG |
43 | /* Call the subarch specific early setup function */ |
44 | switch (boot_params.hdr.hardware_subarch) { | |
712b6aa8 KS |
45 | case X86_SUBARCH_INTEL_MID: |
46 | x86_intel_mid_early_setup(); | |
3f4110a4 | 47 | break; |
c751e17b TG |
48 | case X86_SUBARCH_CE4100: |
49 | x86_ce4100_early_setup(); | |
50 | break; | |
47a3d5da TG |
51 | default: |
52 | i386_default_early_setup(); | |
53 | break; | |
54 | } | |
a4c81cf6 | 55 | |
700efc1b EB |
56 | start_kernel(); |
57 | } | |
1e620f9b BO |
58 | |
59 | /* | |
60 | * Initialize page tables. This creates a PDE and a set of page | |
61 | * tables, which are located immediately beyond __brk_base. The variable | |
62 | * _brk_end is set up to point to the first "safe" location. | |
63 | * Mappings are created both at virtual address 0 (identity mapping) | |
64 | * and PAGE_OFFSET for up to _end. | |
65 | * | |
66 | * In PAE mode initial_page_table is statically defined to contain | |
67 | * enough entries to cover the VMSPLIT option (that is the top 1, 2 or 3 | |
68 | * entries). The identity mapping is handled by pointing two PGD entries | |
69 | * to the first kernel PMD. Note the upper half of each PMD or PTE are | |
70 | * always zero at this stage. | |
71 | */ | |
72 | void __init mk_early_pgtbl_32(void) | |
73 | { | |
74 | #ifdef __pa | |
75 | #undef __pa | |
76 | #endif | |
77 | #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET) | |
78 | pte_t pte, *ptep; | |
79 | int i; | |
80 | unsigned long *ptr; | |
81 | /* Enough space to fit pagetables for the low memory linear map */ | |
82 | const unsigned long limit = __pa(_end) + | |
83 | (PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT); | |
84 | #ifdef CONFIG_X86_PAE | |
85 | pmd_t pl2, *pl2p = (pmd_t *)__pa(initial_pg_pmd); | |
86 | #define SET_PL2(pl2, val) { (pl2).pmd = (val); } | |
87 | #else | |
88 | pgd_t pl2, *pl2p = (pgd_t *)__pa(initial_page_table); | |
89 | #define SET_PL2(pl2, val) { (pl2).pgd = (val); } | |
90 | #endif | |
91 | ||
92 | ptep = (pte_t *)__pa(__brk_base); | |
93 | pte.pte = PTE_IDENT_ATTR; | |
94 | ||
95 | while ((pte.pte & PTE_PFN_MASK) < limit) { | |
96 | ||
97 | SET_PL2(pl2, (unsigned long)ptep | PDE_IDENT_ATTR); | |
98 | *pl2p = pl2; | |
99 | #ifndef CONFIG_X86_PAE | |
100 | /* Kernel PDE entry */ | |
101 | *(pl2p + ((PAGE_OFFSET >> PGDIR_SHIFT))) = pl2; | |
102 | #endif | |
103 | for (i = 0; i < PTRS_PER_PTE; i++) { | |
104 | *ptep = pte; | |
105 | pte.pte += PAGE_SIZE; | |
106 | ptep++; | |
107 | } | |
108 | ||
109 | pl2p++; | |
110 | } | |
111 | ||
112 | ptr = (unsigned long *)__pa(&max_pfn_mapped); | |
113 | /* Can't use pte_pfn() since it's a call with CONFIG_PARAVIRT */ | |
114 | *ptr = (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT; | |
115 | ||
116 | ptr = (unsigned long *)__pa(&_brk_end); | |
117 | *ptr = (unsigned long)ptep + PAGE_OFFSET; | |
118 | } | |
119 |