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 #include <asm/page_types.h>
10
11 #ifdef __i386__
12
13 #include <linux/pfn.h>
14 /*
15 * Reserved space for vmalloc and iomap - defined in asm/page.h
16 */
17 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
18 #define MAX_NONPAE_PFN (1 << 20)
19
20 #endif /* __i386__ */
21
22 #define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
23
24 #define OLD_CL_MAGIC 0xA33F
25 #define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */
26 #define NEW_CL_POINTER 0x228 /* Relative to real mode data */
27
28 #ifndef __ASSEMBLY__
29 #include <asm/bootparam.h>
30 #include <asm/x86_init.h>
31
32 extern u64 relocated_ramdisk;
33
34 /* Interrupt control for vSMPowered x86_64 systems */
35 #ifdef CONFIG_X86_64
36 void vsmp_init(void);
37 #else
vsmp_init(void)38 static inline void vsmp_init(void) { }
39 #endif
40
41 void setup_bios_corruption_check(void);
42
43 extern unsigned long saved_video_mode;
44
45 extern void reserve_standard_io_resources(void);
46 extern void i386_reserve_resources(void);
47 extern void setup_default_timer_irq(void);
48
49 #ifdef CONFIG_X86_INTEL_MID
50 extern void x86_intel_mid_early_setup(void);
51 #else
x86_intel_mid_early_setup(void)52 static inline void x86_intel_mid_early_setup(void) { }
53 #endif
54
55 #ifdef CONFIG_X86_INTEL_CE
56 extern void x86_ce4100_early_setup(void);
57 #else
x86_ce4100_early_setup(void)58 static inline void x86_ce4100_early_setup(void) { }
59 #endif
60
61 #ifndef _SETUP
62
63 #include <asm/espfix.h>
64 #include <linux/kernel.h>
65
66 /*
67 * This is set up by the setup-routine at boot-time
68 */
69 extern struct boot_params boot_params;
70 extern char _text[];
71
kaslr_enabled(void)72 static inline bool kaslr_enabled(void)
73 {
74 return !!(boot_params.hdr.loadflags & KASLR_FLAG);
75 }
76
kaslr_offset(void)77 static inline unsigned long kaslr_offset(void)
78 {
79 return (unsigned long)&_text - __START_KERNEL;
80 }
81
82 /*
83 * Do NOT EVER look at the BIOS memory size location.
84 * It does not work on many machines.
85 */
86 #define LOWMEMSIZE() (0x9f000)
87
88 /* exceedingly early brk-like allocator */
89 extern unsigned long _brk_end;
90 void *extend_brk(size_t size, size_t align);
91
92 /*
93 * Reserve space in the brk section. The name must be unique within
94 * the file, and somewhat descriptive. The size is in bytes. Must be
95 * used at file scope.
96 *
97 * (This uses a temp function to wrap the asm so we can pass it the
98 * size parameter; otherwise we wouldn't be able to. We can't use a
99 * "section" attribute on a normal variable because it always ends up
100 * being @progbits, which ends up allocating space in the vmlinux
101 * executable.)
102 */
103 #define RESERVE_BRK(name,sz) \
104 static void __section(.discard.text) __used notrace \
105 __brk_reservation_fn_##name##__(void) { \
106 asm volatile ( \
107 ".pushsection .brk_reservation,\"aw\",@nobits;" \
108 ".brk." #name ":" \
109 " 1:.skip %c0;" \
110 " .size .brk." #name ", . - 1b;" \
111 " .popsection" \
112 : : "i" (sz)); \
113 }
114
115 /* Helper for reserving space for arrays of things */
116 #define RESERVE_BRK_ARRAY(type, name, entries) \
117 type *name; \
118 RESERVE_BRK(name, sizeof(type) * entries)
119
120 extern void probe_roms(void);
121 #ifdef __i386__
122
123 asmlinkage void __init i386_start_kernel(void);
124
125 #else
126 asmlinkage void __init x86_64_start_kernel(char *real_mode);
127 asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
128
129 #endif /* __i386__ */
130 #endif /* _SETUP */
131 #else
132 #define RESERVE_BRK(name,sz) \
133 .pushsection .brk_reservation,"aw",@nobits; \
134 .brk.name: \
135 1: .skip sz; \
136 .size .brk.name,.-1b; \
137 .popsection
138 #endif /* __ASSEMBLY__ */
139 #endif /* _ASM_X86_SETUP_H */
140