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
42struct pt_regs;
43
44void setup_bios_corruption_check(void);
45void early_platform_quirks(void);
46
47extern unsigned long saved_video_mode;
48
49extern void reserve_standard_io_resources(void);
50extern void i386_reserve_resources(void);
51extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
52extern unsigned long __startup_secondary_64(void);
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
122/* Helper for reserving space for arrays of things */
123#define RESERVE_BRK_ARRAY(type, name, entries)		\
124	type *name;					\
125	RESERVE_BRK(name, sizeof(type) * entries)
126
127extern void probe_roms(void);
128#ifdef __i386__
129
130asmlinkage void __init i386_start_kernel(void);
131
132#else
133asmlinkage void __init x86_64_start_kernel(char *real_mode);
134asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
135
136#endif /* __i386__ */
137#endif /* _SETUP */
138
139#else  /* __ASSEMBLY */
140
141.macro __RESERVE_BRK name, size
142	.pushsection .bss..brk, "aw"
143SYM_DATA_START(__brk_\name)
144	.skip \size
145SYM_DATA_END(__brk_\name)
146	.popsection
147.endm
148
149#define RESERVE_BRK(name, size) __RESERVE_BRK name, size
150
151#endif /* __ASSEMBLY__ */
152
153#endif /* _ASM_X86_SETUP_H */
154