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1#ifndef _ASM_X86_SETUP_H
2#define _ASM_X86_SETUP_H
3
4#include <uapi/asm/setup.h>
5
6#define COMMAND_LINE_SIZE 2048
7
8#include <linux/linkage.h>
9
10#ifdef __i386__
11
12#include <linux/pfn.h>
13/*
14 * Reserved space for vmalloc and iomap - defined in asm/page.h
15 */
16#define MAXMEM_PFN PFN_DOWN(MAXMEM)
17#define MAX_NONPAE_PFN (1 << 20)
18
19#endif /* __i386__ */
20
21#define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
22
23#define OLD_CL_MAGIC 0xA33F
24#define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */
25#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
26
27#ifndef __ASSEMBLY__
28#include <asm/bootparam.h>
29#include <asm/x86_init.h>
30
31extern u64 relocated_ramdisk;
32
33/* Interrupt control for vSMPowered x86_64 systems */
34#ifdef CONFIG_X86_64
35void vsmp_init(void);
36#else
37static inline void vsmp_init(void) { }
38#endif
39
40void setup_bios_corruption_check(void);
41
42extern unsigned long saved_video_mode;
43
44extern void reserve_standard_io_resources(void);
45extern void i386_reserve_resources(void);
46extern void setup_default_timer_irq(void);
47
48#ifdef CONFIG_X86_INTEL_MID
49extern void x86_intel_mid_early_setup(void);
50#else
51static inline void x86_intel_mid_early_setup(void) { }
52#endif
53
54#ifdef CONFIG_X86_INTEL_CE
55extern void x86_ce4100_early_setup(void);
56#else
57static inline void x86_ce4100_early_setup(void) { }
58#endif
59
60#ifndef _SETUP
61
62#include <asm/espfix.h>
63
64/*
65 * This is set up by the setup-routine at boot-time
66 */
67extern struct boot_params boot_params;
68
69static inline bool kaslr_enabled(void)
70{
71 return !!(boot_params.hdr.loadflags & KASLR_FLAG);
72}
73
74/*
75 * Do NOT EVER look at the BIOS memory size location.
76 * It does not work on many machines.
77 */
78#define LOWMEMSIZE() (0x9f000)
79
80/* exceedingly early brk-like allocator */
81extern unsigned long _brk_end;
82void *extend_brk(size_t size, size_t align);
83
84/*
85 * Reserve space in the brk section. The name must be unique within
86 * the file, and somewhat descriptive. The size is in bytes. Must be
87 * used at file scope.
88 *
89 * (This uses a temp function to wrap the asm so we can pass it the
90 * size parameter; otherwise we wouldn't be able to. We can't use a
91 * "section" attribute on a normal variable because it always ends up
92 * being @progbits, which ends up allocating space in the vmlinux
93 * executable.)
94 */
95#define RESERVE_BRK(name,sz) \
96 static void __section(.discard.text) __used notrace \
97 __brk_reservation_fn_##name##__(void) { \
98 asm volatile ( \
99 ".pushsection .brk_reservation,\"aw\",@nobits;" \
100 ".brk." #name ":" \
101 " 1:.skip %c0;" \
102 " .size .brk." #name ", . - 1b;" \
103 " .popsection" \
104 : : "i" (sz)); \
105 }
106
107/* Helper for reserving space for arrays of things */
108#define RESERVE_BRK_ARRAY(type, name, entries) \
109 type *name; \
110 RESERVE_BRK(name, sizeof(type) * entries)
111
112extern void probe_roms(void);
113#ifdef __i386__
114
115asmlinkage void __init i386_start_kernel(void);
116
117#else
118asmlinkage void __init x86_64_start_kernel(char *real_mode);
119asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
120
121#endif /* __i386__ */
122#endif /* _SETUP */
123#else
124#define RESERVE_BRK(name,sz) \
125 .pushsection .brk_reservation,"aw",@nobits; \
126.brk.name: \
1271: .skip sz; \
128 .size .brk.name,.-1b; \
129 .popsection
130#endif /* __ASSEMBLY__ */
131#endif /* _ASM_X86_SETUP_H */