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 <asm/bootparam.h> |
32 | #include <asm/x86_init.h> |
33 | |
34 | extern u64 relocated_ramdisk; |
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_env(unsigned long physbase); |
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 | #else /* __ASSEMBLY */ |
139 | |
140 | .macro __RESERVE_BRK name, size |
141 | .pushsection .bss..brk, "aw" |
142 | SYM_DATA_START(__brk_\name) |
143 | .skip \size |
144 | SYM_DATA_END(__brk_\name) |
145 | .popsection |
146 | .endm |
147 | |
148 | #define RESERVE_BRK(name, size) __RESERVE_BRK name, size |
149 | |
150 | #endif /* __ASSEMBLY__ */ |
151 | |
152 | #endif /* _ASM_X86_SETUP_H */ |
153 | |