1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_SETUP_H
3#define _ASM_X86_SETUP_H
4
5#include <uapi/asm/setup.h>
6
7#define COMMAND_LINE_SIZE 2048
8
9#include <linux/linkage.h>
10#include <asm/page_types.h>
11#include <asm/ibt.h>
12
13#ifdef __i386__
14
15#include <linux/pfn.h>
16/*
17 * Reserved space for vmalloc and iomap - defined in asm/page.h
18 */
19#define MAXMEM_PFN PFN_DOWN(MAXMEM)
20#define MAX_NONPAE_PFN (1 << 20)
21
22#endif /* __i386__ */
23
24#define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
25
26#define OLD_CL_MAGIC 0xA33F
27#define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */
28#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
29
30#ifndef __ASSEMBLER__
31#include <linux/cache.h>
32
33#include <asm/bootparam.h>
34#include <asm/x86_init.h>
35
36/* Interrupt control for vSMPowered x86_64 systems */
37#ifdef CONFIG_X86_64
38void vsmp_init(void);
39#else
40static inline void vsmp_init(void) { }
41#endif
42
43struct pt_regs;
44
45void setup_bios_corruption_check(void);
46void early_platform_quirks(void);
47
48extern unsigned long saved_video_mode;
49extern unsigned long acpi_realmode_flags;
50
51extern void reserve_standard_io_resources(void);
52extern void i386_reserve_resources(void);
53extern unsigned long __startup_64(unsigned long p2v_offset, struct boot_params *bp);
54extern void startup_64_setup_gdt_idt(void);
55extern void startup_64_load_idt(void *vc_handler);
56extern void __pi_startup_64_load_idt(void *vc_handler);
57extern void early_setup_idt(void);
58extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
59
60#ifdef CONFIG_X86_INTEL_MID
61extern void x86_intel_mid_early_setup(void);
62#else
63static inline void x86_intel_mid_early_setup(void) { }
64#endif
65
66#ifdef CONFIG_X86_INTEL_CE
67extern void x86_ce4100_early_setup(void);
68#else
69static inline void x86_ce4100_early_setup(void) { }
70#endif
71
72#include <linux/kexec_handover.h>
73
74#ifndef _SETUP
75
76#include <asm/espfix.h>
77#include <linux/kernel.h>
78
79/*
80 * This is set up by the setup-routine at boot-time
81 */
82extern struct boot_params boot_params;
83extern char _text[];
84
85static inline bool kaslr_enabled(void)
86{
87 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
88 !!(boot_params.hdr.loadflags & KASLR_FLAG);
89}
90
91/*
92 * Apply no randomization if KASLR was disabled at boot or if KASAN
93 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
94 */
95static inline bool kaslr_memory_enabled(void)
96{
97 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
98}
99
100static inline unsigned long kaslr_offset(void)
101{
102 return (unsigned long)&_text - __START_KERNEL;
103}
104
105/*
106 * Do NOT EVER look at the BIOS memory size location.
107 * It does not work on many machines.
108 */
109#define LOWMEMSIZE() (0x9f000)
110
111/* exceedingly early brk-like allocator */
112extern unsigned long _brk_end;
113void *extend_brk(size_t size, size_t align);
114
115/*
116 * Reserve space in the .brk section, which is a block of memory from which the
117 * caller is allowed to allocate very early (before even memblock is available)
118 * by calling extend_brk(). All allocated memory will be eventually converted
119 * to memblock. Any leftover unallocated memory will be freed.
120 *
121 * The size is in bytes.
122 */
123#define RESERVE_BRK(name, size) \
124 __section(".bss..brk") __aligned(1) __used \
125 static char __brk_##name[size]
126
127extern void probe_roms(void);
128
129void clear_bss(void);
130
131#ifdef __i386__
132
133asmlinkage void __init __noreturn i386_start_kernel(void);
134void __init mk_early_pgtbl_32(void);
135
136#else
137asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode);
138asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data);
139
140#endif /* __i386__ */
141#endif /* _SETUP */
142
143#ifdef CONFIG_CMDLINE_BOOL
144extern bool builtin_cmdline_added __ro_after_init;
145#else
146#define builtin_cmdline_added 0
147#endif
148
149#else /* __ASSEMBLER__ */
150
151.macro __RESERVE_BRK name, size
152 .pushsection .bss..brk, "aw"
153SYM_DATA_START(__brk_\name)
154 .skip \size
155SYM_DATA_END(__brk_\name)
156 .popsection
157.endm
158
159#define RESERVE_BRK(name, size) __RESERVE_BRK name, size
160
161#endif /* __ASSEMBLER__ */
162
163#endif /* _ASM_X86_SETUP_H */
164

source code of linux/arch/x86/include/asm/setup.h