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
34/* Interrupt control for vSMPowered x86_64 systems */
35#ifdef CONFIG_X86_64
36void vsmp_init(void);
37#else
38static inline void vsmp_init(void) { }
39#endif
40
41struct pt_regs;
42
43void setup_bios_corruption_check(void);
44void early_platform_quirks(void);
45
46extern unsigned long saved_video_mode;
47
48extern void reserve_standard_io_resources(void);
49extern void i386_reserve_resources(void);
50extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
51extern void startup_64_setup_gdt_idt(void);
52extern void early_setup_idt(void);
53extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
54
55#ifdef CONFIG_X86_INTEL_MID
56extern void x86_intel_mid_early_setup(void);
57#else
58static inline void x86_intel_mid_early_setup(void) { }
59#endif
60
61#ifdef CONFIG_X86_INTEL_CE
62extern void x86_ce4100_early_setup(void);
63#else
64static inline void x86_ce4100_early_setup(void) { }
65#endif
66
67#ifndef _SETUP
68
69#include <asm/espfix.h>
70#include <linux/kernel.h>
71
72/*
73 * This is set up by the setup-routine at boot-time
74 */
75extern struct boot_params boot_params;
76extern char _text[];
77
78static inline bool kaslr_enabled(void)
79{
80	return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
81		!!(boot_params.hdr.loadflags & KASLR_FLAG);
82}
83
84/*
85 * Apply no randomization if KASLR was disabled at boot or if KASAN
86 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
87 */
88static inline bool kaslr_memory_enabled(void)
89{
90	return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
91}
92
93static inline unsigned long kaslr_offset(void)
94{
95	return (unsigned long)&_text - __START_KERNEL;
96}
97
98/*
99 * Do NOT EVER look at the BIOS memory size location.
100 * It does not work on many machines.
101 */
102#define LOWMEMSIZE()	(0x9f000)
103
104/* exceedingly early brk-like allocator */
105extern unsigned long _brk_end;
106void *extend_brk(size_t size, size_t align);
107
108/*
109 * Reserve space in the .brk section, which is a block of memory from which the
110 * caller is allowed to allocate very early (before even memblock is available)
111 * by calling extend_brk().  All allocated memory will be eventually converted
112 * to memblock.  Any leftover unallocated memory will be freed.
113 *
114 * The size is in bytes.
115 */
116#define RESERVE_BRK(name, size)					\
117	__section(".bss..brk") __aligned(1) __used	\
118	static char __brk_##name[size]
119
120extern void probe_roms(void);
121
122void clear_bss(void);
123
124#ifdef __i386__
125
126asmlinkage void __init __noreturn i386_start_kernel(void);
127void __init mk_early_pgtbl_32(void);
128
129#else
130asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode);
131asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data);
132
133#endif /* __i386__ */
134#endif /* _SETUP */
135
136#else  /* __ASSEMBLY */
137
138.macro __RESERVE_BRK name, size
139	.pushsection .bss..brk, "aw"
140SYM_DATA_START(__brk_\name)
141	.skip \size
142SYM_DATA_END(__brk_\name)
143	.popsection
144.endm
145
146#define RESERVE_BRK(name, size) __RESERVE_BRK name, size
147
148#endif /* __ASSEMBLY__ */
149
150#endif /* _ASM_X86_SETUP_H */
151