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 4096
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
vsmp_init(void)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 extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
50 extern unsigned long __startup_secondary_64(void);
51 extern int early_make_pgtable(unsigned long address);
52
53 #ifdef CONFIG_X86_INTEL_MID
54 extern void x86_intel_mid_early_setup(void);
55 #else
x86_intel_mid_early_setup(void)56 static inline void x86_intel_mid_early_setup(void) { }
57 #endif
58
59 #ifdef CONFIG_X86_INTEL_CE
60 extern void x86_ce4100_early_setup(void);
61 #else
x86_ce4100_early_setup(void)62 static inline void x86_ce4100_early_setup(void) { }
63 #endif
64
65 #ifndef _SETUP
66
67 #include <asm/espfix.h>
68 #include <linux/kernel.h>
69
70 /*
71 * This is set up by the setup-routine at boot-time
72 */
73 extern struct boot_params boot_params;
74 extern char _text[];
75
kaslr_enabled(void)76 static inline bool kaslr_enabled(void)
77 {
78 return !!(boot_params.hdr.loadflags & KASLR_FLAG);
79 }
80
kaslr_offset(void)81 static inline unsigned long kaslr_offset(void)
82 {
83 return (unsigned long)&_text - __START_KERNEL;
84 }
85
86 /*
87 * Do NOT EVER look at the BIOS memory size location.
88 * It does not work on many machines.
89 */
90 #define LOWMEMSIZE() (0x9f000)
91
92 /* exceedingly early brk-like allocator */
93 extern unsigned long _brk_end;
94 void *extend_brk(size_t size, size_t align);
95
96 /*
97 * Reserve space in the .brk section, which is a block of memory from which the
98 * caller is allowed to allocate very early (before even memblock is available)
99 * by calling extend_brk(). All allocated memory will be eventually converted
100 * to memblock. Any leftover unallocated memory will be freed.
101 *
102 * The size is in bytes.
103 */
104 #define RESERVE_BRK(name, size) \
105 __section(.bss..brk) __aligned(1) __used \
106 static char __brk_##name[size]
107
108 /* Helper for reserving space for arrays of things */
109 #define RESERVE_BRK_ARRAY(type, name, entries) \
110 type *name; \
111 RESERVE_BRK(name, sizeof(type) * entries)
112
113 extern void probe_roms(void);
114 #ifdef __i386__
115
116 asmlinkage void __init i386_start_kernel(void);
117
118 #else
119 asmlinkage void __init x86_64_start_kernel(char *real_mode);
120 asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
121
122 #endif /* __i386__ */
123 #endif /* _SETUP */
124
125 #else /* __ASSEMBLY */
126
127 .macro __RESERVE_BRK name, size
128 .pushsection .bss..brk, "aw"
129 SYM_DATA_START(__brk_\name)
130 .skip \size
131 SYM_DATA_END(__brk_\name)
132 .popsection
133 .endm
134
135 #define RESERVE_BRK(name, size) __RESERVE_BRK name, size
136
137 #endif /* __ASSEMBLY__ */
138
139 #endif /* _ASM_X86_SETUP_H */
140