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#include <linux/kernel.h>
64
65/*
66 * This is set up by the setup-routine at boot-time
67 */
68extern struct boot_params boot_params;
69extern char _text[];
70
71static inline bool kaslr_enabled(void)
72{
73	return !!(boot_params.hdr.loadflags & KASLR_FLAG);
74}
75
76static inline unsigned long kaslr_offset(void)
77{
78	return (unsigned long)&_text - __START_KERNEL;
79}
80
81/*
82 * Do NOT EVER look at the BIOS memory size location.
83 * It does not work on many machines.
84 */
85#define LOWMEMSIZE()	(0x9f000)
86
87/* exceedingly early brk-like allocator */
88extern unsigned long _brk_end;
89void *extend_brk(size_t size, size_t align);
90
91/*
92 * Reserve space in the brk section.  The name must be unique within
93 * the file, and somewhat descriptive.  The size is in bytes.  Must be
94 * used at file scope.
95 *
96 * (This uses a temp function to wrap the asm so we can pass it the
97 * size parameter; otherwise we wouldn't be able to.  We can't use a
98 * "section" attribute on a normal variable because it always ends up
99 * being @progbits, which ends up allocating space in the vmlinux
100 * executable.)
101 */
102#define RESERVE_BRK(name,sz)						\
103	static void __section(.discard.text) __used notrace		\
104	__brk_reservation_fn_##name##__(void) {				\
105		asm volatile (						\
106			".pushsection .brk_reservation,\"aw\",@nobits;" \
107			".brk." #name ":"				\
108			" 1:.skip %c0;"					\
109			" .size .brk." #name ", . - 1b;"		\
110			" .popsection"					\
111			: : "i" (sz));					\
112	}
113
114/* Helper for reserving space for arrays of things */
115#define RESERVE_BRK_ARRAY(type, name, entries)		\
116	type *name;					\
117	RESERVE_BRK(name, sizeof(type) * entries)
118
119extern void probe_roms(void);
120#ifdef __i386__
121
122asmlinkage void __init i386_start_kernel(void);
123
124#else
125asmlinkage void __init x86_64_start_kernel(char *real_mode);
126asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
127
128#endif /* __i386__ */
129#endif /* _SETUP */
130#else
131#define RESERVE_BRK(name,sz)				\
132	.pushsection .brk_reservation,"aw",@nobits;	\
133.brk.name:						\
1341:	.skip sz;					\
135	.size .brk.name,.-1b;				\
136	.popsection
137#endif /* __ASSEMBLY__ */
138#endif /* _ASM_X86_SETUP_H */
139