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);
49extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
50extern unsigned long __startup_secondary_64(void);
51extern int early_make_pgtable(unsigned long address);
52
53#ifdef CONFIG_X86_INTEL_MID
54extern void x86_intel_mid_early_setup(void);
55#else
56static inline void x86_intel_mid_early_setup(void) { }
57#endif
58
59#ifdef CONFIG_X86_INTEL_CE
60extern void x86_ce4100_early_setup(void);
61#else
62static inline void x86_ce4100_early_setup(void) { }
63#endif
64
65#ifndef _SETUP
66
67#include <asm/espfix.h>
68#include <linux/kernel.h>
69
70/*
71 * This is set up by the setup-routine at boot-time
72 */
73extern struct boot_params boot_params;
74extern char _text[];
75
76static inline bool kaslr_enabled(void)
77{
78 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
79 !!(boot_params.hdr.loadflags & KASLR_FLAG);
80}
81
82/*
83 * Apply no randomization if KASLR was disabled at boot or if KASAN
84 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
85 */
86static inline bool kaslr_memory_enabled(void)
87{
88 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
89}
90
91static inline unsigned long kaslr_offset(void)
92{
93 return (unsigned long)&_text - __START_KERNEL;
94}
95
96/*
97 * Do NOT EVER look at the BIOS memory size location.
98 * It does not work on many machines.
99 */
100#define LOWMEMSIZE() (0x9f000)
101
102/* exceedingly early brk-like allocator */
103extern unsigned long _brk_end;
104void *extend_brk(size_t size, size_t align);
105
106/*
107 * Reserve space in the brk section. The name must be unique within
108 * the file, and somewhat descriptive. The size is in bytes. Must be
109 * used at file scope.
110 *
111 * (This uses a temp function to wrap the asm so we can pass it the
112 * size parameter; otherwise we wouldn't be able to. We can't use a
113 * "section" attribute on a normal variable because it always ends up
114 * being @progbits, which ends up allocating space in the vmlinux
115 * executable.)
116 */
117#define RESERVE_BRK(name,sz) \
118 static void __section(.discard.text) __used notrace \
119 __brk_reservation_fn_##name##__(void) { \
120 asm volatile ( \
121 ".pushsection .brk_reservation,\"aw\",@nobits;" \
122 ".brk." #name ":" \
123 " 1:.skip %c0;" \
124 " .size .brk." #name ", . - 1b;" \
125 " .popsection" \
126 : : "i" (sz)); \
127 }
128
129/* Helper for reserving space for arrays of things */
130#define RESERVE_BRK_ARRAY(type, name, entries) \
131 type *name; \
132 RESERVE_BRK(name, sizeof(type) * entries)
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 */