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
31 extern u64 relocated_ramdisk;
32
33 /* Interrupt control for vSMPowered x86_64 systems */
34 #ifdef CONFIG_X86_64
35 void vsmp_init(void);
36 #else
vsmp_init(void)37 static inline void vsmp_init(void) { }
38 #endif
39
40 void setup_bios_corruption_check(void);
41
42 extern unsigned long saved_video_mode;
43
44 extern void reserve_standard_io_resources(void);
45 extern void i386_reserve_resources(void);
46 extern void setup_default_timer_irq(void);
47
48 #ifdef CONFIG_X86_INTEL_MID
49 extern void x86_intel_mid_early_setup(void);
50 #else
x86_intel_mid_early_setup(void)51 static inline void x86_intel_mid_early_setup(void) { }
52 #endif
53
54 #ifdef CONFIG_X86_INTEL_CE
55 extern void x86_ce4100_early_setup(void);
56 #else
x86_ce4100_early_setup(void)57 static 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 */
68 extern struct boot_params boot_params;
69 extern char _text[];
70
kaslr_enabled(void)71 static inline bool kaslr_enabled(void)
72 {
73 return !!(boot_params.hdr.loadflags & KASLR_FLAG);
74 }
75
kaslr_offset(void)76 static 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 */
88 extern unsigned long _brk_end;
89 void *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
119 extern void probe_roms(void);
120 #ifdef __i386__
121
122 asmlinkage void __init i386_start_kernel(void);
123
124 #else
125 asmlinkage void __init x86_64_start_kernel(char *real_mode);
126 asmlinkage 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: \
134 1: .skip sz; \
135 .size .brk.name,.-1b; \
136 .popsection
137 #endif /* __ASSEMBLY__ */
138 #endif /* _ASM_X86_SETUP_H */
139