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 __ASSEMBLY__
31#include <asm/bootparam.h>
32#include <asm/x86_init.h>
33
34extern u64 relocated_ramdisk;
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;
49
50extern void reserve_standard_io_resources(void);
51extern void i386_reserve_resources(void);
52extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
53extern void startup_64_setup_env(unsigned long physbase);
54extern void early_setup_idt(void);
55extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
56
57#ifdef CONFIG_X86_INTEL_MID
58extern void x86_intel_mid_early_setup(void);
59#else
60static inline void x86_intel_mid_early_setup(void) { }
61#endif
62
63#ifdef CONFIG_X86_INTEL_CE
64extern void x86_ce4100_early_setup(void);
65#else
66static inline void x86_ce4100_early_setup(void) { }
67#endif
68
69#ifndef _SETUP
70
71#include <asm/espfix.h>
72#include <linux/kernel.h>
73
74/*
75 * This is set up by the setup-routine at boot-time
76 */
77extern struct boot_params boot_params;
78extern char _text[];
79
80static inline bool kaslr_enabled(void)
81{
82 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
83 !!(boot_params.hdr.loadflags & KASLR_FLAG);
84}
85
86/*
87 * Apply no randomization if KASLR was disabled at boot or if KASAN
88 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
89 */
90static inline bool kaslr_memory_enabled(void)
91{
92 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
93}
94
95static inline unsigned long kaslr_offset(void)
96{
97 return (unsigned long)&_text - __START_KERNEL;
98}
99
100/*
101 * Do NOT EVER look at the BIOS memory size location.
102 * It does not work on many machines.
103 */
104#define LOWMEMSIZE() (0x9f000)
105
106/* exceedingly early brk-like allocator */
107extern unsigned long _brk_end;
108void *extend_brk(size_t size, size_t align);
109
110/*
111 * Reserve space in the .brk section, which is a block of memory from which the
112 * caller is allowed to allocate very early (before even memblock is available)
113 * by calling extend_brk(). All allocated memory will be eventually converted
114 * to memblock. Any leftover unallocated memory will be freed.
115 *
116 * The size is in bytes.
117 */
118#define RESERVE_BRK(name, size) \
119 __section(".bss..brk") __aligned(1) __used \
120 static char __brk_##name[size]
121
122extern void probe_roms(void);
123
124void clear_bss(void);
125
126#ifdef __i386__
127
128asmlinkage void __init __noreturn i386_start_kernel(void);
129void __init mk_early_pgtbl_32(void);
130
131#else
132asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode);
133asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data);
134
135#endif /* __i386__ */
136#endif /* _SETUP */
137
138#else /* __ASSEMBLY */
139
140.macro __RESERVE_BRK name, size
141 .pushsection .bss..brk, "aw"
142SYM_DATA_START(__brk_\name)
143 .skip \size
144SYM_DATA_END(__brk_\name)
145 .popsection
146.endm
147
148#define RESERVE_BRK(name, size) __RESERVE_BRK name, size
149
150#endif /* __ASSEMBLY__ */
151
152#endif /* _ASM_X86_SETUP_H */
153

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