Linux kernel mirror (for testing)
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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 unsigned long __startup_secondary_64(void);
54extern void startup_64_setup_env(unsigned long physbase);
55extern void early_setup_idt(void);
56extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
57
58#ifdef CONFIG_X86_INTEL_MID
59extern void x86_intel_mid_early_setup(void);
60#else
61static inline void x86_intel_mid_early_setup(void) { }
62#endif
63
64#ifdef CONFIG_X86_INTEL_CE
65extern void x86_ce4100_early_setup(void);
66#else
67static inline void x86_ce4100_early_setup(void) { }
68#endif
69
70#ifndef _SETUP
71
72#include <asm/espfix.h>
73#include <linux/kernel.h>
74
75/*
76 * This is set up by the setup-routine at boot-time
77 */
78extern struct boot_params boot_params;
79extern char _text[];
80
81static inline bool kaslr_enabled(void)
82{
83 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
84 !!(boot_params.hdr.loadflags & KASLR_FLAG);
85}
86
87/*
88 * Apply no randomization if KASLR was disabled at boot or if KASAN
89 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
90 */
91static inline bool kaslr_memory_enabled(void)
92{
93 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
94}
95
96static inline unsigned long kaslr_offset(void)
97{
98 return (unsigned long)&_text - __START_KERNEL;
99}
100
101/*
102 * Do NOT EVER look at the BIOS memory size location.
103 * It does not work on many machines.
104 */
105#define LOWMEMSIZE() (0x9f000)
106
107/* exceedingly early brk-like allocator */
108extern unsigned long _brk_end;
109void *extend_brk(size_t size, size_t align);
110
111/*
112 * Reserve space in the brk section. The name must be unique within
113 * the file, and somewhat descriptive. The size is in bytes. Must be
114 * used at file scope.
115 *
116 * (This uses a temp function to wrap the asm so we can pass it the
117 * size parameter; otherwise we wouldn't be able to. We can't use a
118 * "section" attribute on a normal variable because it always ends up
119 * being @progbits, which ends up allocating space in the vmlinux
120 * executable.)
121 */
122#define RESERVE_BRK(name,sz) \
123 static void __section(".discard.text") __noendbr __used notrace \
124 __brk_reservation_fn_##name##__(void) { \
125 asm volatile ( \
126 ".pushsection .brk_reservation,\"aw\",@nobits;" \
127 ".brk." #name ":" \
128 " 1:.skip %c0;" \
129 " .size .brk." #name ", . - 1b;" \
130 " .popsection" \
131 : : "i" (sz)); \
132 }
133
134extern void probe_roms(void);
135#ifdef __i386__
136
137asmlinkage void __init i386_start_kernel(void);
138
139#else
140asmlinkage void __init x86_64_start_kernel(char *real_mode);
141asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
142
143#endif /* __i386__ */
144#endif /* _SETUP */
145#else
146#define RESERVE_BRK(name,sz) \
147 .pushsection .brk_reservation,"aw",@nobits; \
148.brk.name: \
1491: .skip sz; \
150 .size .brk.name,.-1b; \
151 .popsection
152#endif /* __ASSEMBLY__ */
153#endif /* _ASM_X86_SETUP_H */