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 #include <asm/ibt.h>
12
13 #ifdef __i386__
14
15 #include <linux/pfn.h>
16 /*
17 * Reserved space for vmalloc and iomap - defined in asm/page.h
18 */
19 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
20 #define MAX_NONPAE_PFN (1 << 20)
21
22 #endif /* __i386__ */
23
24 #define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
25
26 #define OLD_CL_MAGIC 0xA33F
27 #define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */
28 #define NEW_CL_POINTER 0x228 /* Relative to real mode data */
29
30 #ifndef __ASSEMBLY__
31 #include <linux/cache.h>
32
33 #include <asm/bootparam.h>
34 #include <asm/x86_init.h>
35
36 /* Interrupt control for vSMPowered x86_64 systems */
37 #ifdef CONFIG_X86_64
38 void vsmp_init(void);
39 #else
40 static inline void vsmp_init(void) { }
41 #endif
42
43 struct pt_regs;
44
45 void setup_bios_corruption_check(void);
46 void early_platform_quirks(void);
47
48 extern unsigned long saved_video_mode;
49
50 extern void reserve_standard_io_resources(void);
51 extern void i386_reserve_resources(void);
52 extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
53 extern void startup_64_setup_gdt_idt(void);
54 extern void early_setup_idt(void);
55 extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
56
57 #ifdef CONFIG_X86_INTEL_MID
58 extern void x86_intel_mid_early_setup(void);
59 #else
60 static inline void x86_intel_mid_early_setup(void) { }
61 #endif
62
63 #ifdef CONFIG_X86_INTEL_CE
64 extern void x86_ce4100_early_setup(void);
65 #else
66 static inline void x86_ce4100_early_setup(void) { }
67 #endif
68
69 #ifndef _SETUP
70
71 #include <asm/espfix.h>
72 #include <linux/kernel.h>
73
74 /*
75 * This is set up by the setup-routine at boot-time
76 */
77 extern struct boot_params boot_params;
78 extern char _text[];
79
80 static inline bool kaslr_enabled(void)
81 {
82 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
83 !!(boot_params.hdr.loadflags & KASLR_FLAG);
84 }
85
86 /*
87 * Apply no randomization if KASLR was disabled at boot or if KASAN
88 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
89 */
90 static inline bool kaslr_memory_enabled(void)
91 {
92 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
93 }
94
95 static inline unsigned long kaslr_offset(void)
96 {
97 return (unsigned long)&_text - __START_KERNEL;
98 }
99
100 /*
101 * Do NOT EVER look at the BIOS memory size location.
102 * It does not work on many machines.
103 */
104 #define LOWMEMSIZE() (0x9f000)
105
106 /* exceedingly early brk-like allocator */
107 extern unsigned long _brk_end;
108 void *extend_brk(size_t size, size_t align);
109
110 /*
111 * Reserve space in the .brk section, which is a block of memory from which the
112 * caller is allowed to allocate very early (before even memblock is available)
113 * by calling extend_brk(). All allocated memory will be eventually converted
114 * to memblock. Any leftover unallocated memory will be freed.
115 *
116 * The size is in bytes.
117 */
118 #define RESERVE_BRK(name, size) \
119 __section(".bss..brk") __aligned(1) __used \
120 static char __brk_##name[size]
121
122 extern void probe_roms(void);
123
124 void clear_bss(void);
125
126 #ifdef __i386__
127
128 asmlinkage void __init __noreturn i386_start_kernel(void);
129 void __init mk_early_pgtbl_32(void);
130
131 #else
132 asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode);
133 asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data);
134
135 #endif /* __i386__ */
136 #endif /* _SETUP */
137
138 #ifdef CONFIG_CMDLINE_BOOL
139 extern bool builtin_cmdline_added __ro_after_init;
140 #else
141 #define builtin_cmdline_added 0
142 #endif
143
144 #else /* __ASSEMBLY */
145
146 .macro __RESERVE_BRK name, size
147 .pushsection .bss..brk, "aw"
148 SYM_DATA_START(__brk_\name)
149 .skip \size
150 SYM_DATA_END(__brk_\name)
151 .popsection
152 .endm
153
154 #define RESERVE_BRK(name, size) __RESERVE_BRK name, size
155
156 #endif /* __ASSEMBLY__ */
157
158 #endif /* _ASM_X86_SETUP_H */
159
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.