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
12#ifdef __i386__
13
14#include <linux/pfn.h>
15/*
16 * Reserved space for vmalloc and iomap - defined in asm/page.h
17 */
18#define MAXMEM_PFN PFN_DOWN(MAXMEM)
19#define MAX_NONPAE_PFN (1 << 20)
20
21#endif /* __i386__ */
22
23#define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
24
25#define OLD_CL_MAGIC 0xA33F
26#define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */
27#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
28
29#ifndef __ASSEMBLY__
30#include <asm/bootparam.h>
31#include <asm/x86_init.h>
32
33extern u64 relocated_ramdisk;
34
35/* Interrupt control for vSMPowered x86_64 systems */
36#ifdef CONFIG_X86_64
37void vsmp_init(void);
38#else
39static inline void vsmp_init(void) { }
40#endif
41
42void setup_bios_corruption_check(void);
43void early_platform_quirks(void);
44
45extern unsigned long saved_video_mode;
46
47extern void reserve_standard_io_resources(void);
48extern void i386_reserve_resources(void);
49
50#ifdef CONFIG_X86_INTEL_MID
51extern void x86_intel_mid_early_setup(void);
52#else
53static inline void x86_intel_mid_early_setup(void) { }
54#endif
55
56#ifdef CONFIG_X86_INTEL_CE
57extern void x86_ce4100_early_setup(void);
58#else
59static inline void x86_ce4100_early_setup(void) { }
60#endif
61
62#ifndef _SETUP
63
64#include <asm/espfix.h>
65#include <linux/kernel.h>
66
67/*
68 * This is set up by the setup-routine at boot-time
69 */
70extern struct boot_params boot_params;
71extern char _text[];
72
73static inline bool kaslr_enabled(void)
74{
75 return !!(boot_params.hdr.loadflags & KASLR_FLAG);
76}
77
78static inline unsigned long kaslr_offset(void)
79{
80 return (unsigned long)&_text - __START_KERNEL;
81}
82
83/*
84 * Do NOT EVER look at the BIOS memory size location.
85 * It does not work on many machines.
86 */
87#define LOWMEMSIZE() (0x9f000)
88
89/* exceedingly early brk-like allocator */
90extern unsigned long _brk_end;
91void *extend_brk(size_t size, size_t align);
92
93/*
94 * Reserve space in the brk section. The name must be unique within
95 * the file, and somewhat descriptive. The size is in bytes. Must be
96 * used at file scope.
97 *
98 * (This uses a temp function to wrap the asm so we can pass it the
99 * size parameter; otherwise we wouldn't be able to. We can't use a
100 * "section" attribute on a normal variable because it always ends up
101 * being @progbits, which ends up allocating space in the vmlinux
102 * executable.)
103 */
104#define RESERVE_BRK(name,sz) \
105 static void __section(.discard.text) __used notrace \
106 __brk_reservation_fn_##name##__(void) { \
107 asm volatile ( \
108 ".pushsection .brk_reservation,\"aw\",@nobits;" \
109 ".brk." #name ":" \
110 " 1:.skip %c0;" \
111 " .size .brk." #name ", . - 1b;" \
112 " .popsection" \
113 : : "i" (sz)); \
114 }
115
116/* Helper for reserving space for arrays of things */
117#define RESERVE_BRK_ARRAY(type, name, entries) \
118 type *name; \
119 RESERVE_BRK(name, sizeof(type) * entries)
120
121extern void probe_roms(void);
122#ifdef __i386__
123
124asmlinkage void __init i386_start_kernel(void);
125
126#else
127asmlinkage void __init x86_64_start_kernel(char *real_mode);
128asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
129
130#endif /* __i386__ */
131#endif /* _SETUP */
132#else
133#define RESERVE_BRK(name,sz) \
134 .pushsection .brk_reservation,"aw",@nobits; \
135.brk.name: \
1361: .skip sz; \
137 .size .brk.name,.-1b; \
138 .popsection
139#endif /* __ASSEMBLY__ */
140#endif /* _ASM_X86_SETUP_H */