GNU Linux-libre 4.14.294-gnu1
[releases.git] / arch / x86 / include / asm / setup.h
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
12 #ifdef __i386__
13
14 #include <linux/pfn.h>
15 /*
16  * Reserved space for vmalloc and iomap - defined in asm/page.h
17  */
18 #define MAXMEM_PFN      PFN_DOWN(MAXMEM)
19 #define MAX_NONPAE_PFN  (1 << 20)
20
21 #endif /* __i386__ */
22
23 #define PARAM_SIZE 4096         /* sizeof(struct boot_params) */
24
25 #define OLD_CL_MAGIC            0xA33F
26 #define OLD_CL_ADDRESS          0x020   /* Relative to real mode data */
27 #define NEW_CL_POINTER          0x228   /* Relative to real mode data */
28
29 #ifndef __ASSEMBLY__
30 #include <asm/bootparam.h>
31 #include <asm/x86_init.h>
32
33 extern u64 relocated_ramdisk;
34
35 /* Interrupt control for vSMPowered x86_64 systems */
36 #ifdef CONFIG_X86_64
37 void vsmp_init(void);
38 #else
39 static inline void vsmp_init(void) { }
40 #endif
41
42 void setup_bios_corruption_check(void);
43 void early_platform_quirks(void);
44
45 extern unsigned long saved_video_mode;
46
47 extern void reserve_standard_io_resources(void);
48 extern void i386_reserve_resources(void);
49
50 #ifdef CONFIG_X86_INTEL_MID
51 extern void x86_intel_mid_early_setup(void);
52 #else
53 static inline void x86_intel_mid_early_setup(void) { }
54 #endif
55
56 #ifdef CONFIG_X86_INTEL_CE
57 extern void x86_ce4100_early_setup(void);
58 #else
59 static inline void x86_ce4100_early_setup(void) { }
60 #endif
61
62 #ifndef _SETUP
63
64 #include <asm/espfix.h>
65 #include <linux/kernel.h>
66
67 /*
68  * This is set up by the setup-routine at boot-time
69  */
70 extern struct boot_params boot_params;
71 extern char _text[];
72
73 static inline bool kaslr_enabled(void)
74 {
75         return !!(boot_params.hdr.loadflags & KASLR_FLAG);
76 }
77
78 static inline unsigned long kaslr_offset(void)
79 {
80         return (unsigned long)&_text - __START_KERNEL;
81 }
82
83 /*
84  * Do NOT EVER look at the BIOS memory size location.
85  * It does not work on many machines.
86  */
87 #define LOWMEMSIZE()    (0x9f000)
88
89 /* exceedingly early brk-like allocator */
90 extern unsigned long _brk_end;
91 void *extend_brk(size_t size, size_t align);
92
93 /*
94  * Reserve space in the brk section.  The name must be unique within
95  * the file, and somewhat descriptive.  The size is in bytes.  Must be
96  * used at file scope.
97  *
98  * (This uses a temp function to wrap the asm so we can pass it the
99  * size parameter; otherwise we wouldn't be able to.  We can't use a
100  * "section" attribute on a normal variable because it always ends up
101  * being @progbits, which ends up allocating space in the vmlinux
102  * executable.)
103  */
104 #define RESERVE_BRK(name,sz)                                            \
105         static void __section(.discard.text) __used notrace             \
106         __brk_reservation_fn_##name##__(void) {                         \
107                 asm volatile (                                          \
108                         ".pushsection .brk_reservation,\"aw\",@nobits;" \
109                         ".brk." #name ":"                               \
110                         " 1:.skip %c0;"                                 \
111                         " .size .brk." #name ", . - 1b;"                \
112                         " .popsection"                                  \
113                         : : "i" (sz));                                  \
114         }
115
116 /* Helper for reserving space for arrays of things */
117 #define RESERVE_BRK_ARRAY(type, name, entries)          \
118         type *name;                                     \
119         RESERVE_BRK(name, sizeof(type) * entries)
120
121 extern void probe_roms(void);
122 #ifdef __i386__
123
124 asmlinkage void __init i386_start_kernel(void);
125
126 #else
127 asmlinkage void __init x86_64_start_kernel(char *real_mode);
128 asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
129
130 #endif /* __i386__ */
131 #endif /* _SETUP */
132 #else
133 #define RESERVE_BRK(name,sz)                            \
134         .pushsection .brk_reservation,"aw",@nobits;     \
135 .brk.name:                                              \
136 1:      .skip sz;                                       \
137         .size .brk.name,.-1b;                           \
138         .popsection
139 #endif /* __ASSEMBLY__ */
140 #endif /* _ASM_X86_SETUP_H */