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
vsmp_init(void)39 static inline void vsmp_init(void) { }
40 #endif
41
42 struct pt_regs;
43
44 void setup_bios_corruption_check(void);
45 void early_platform_quirks(void);
46
47 extern unsigned long saved_video_mode;
48
49 extern void reserve_standard_io_resources(void);
50 extern void i386_reserve_resources(void);
51 extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
52 extern unsigned long __startup_secondary_64(void);
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
x86_intel_mid_early_setup(void)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
x86_ce4100_early_setup(void)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
kaslr_enabled(void)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 */
kaslr_memory_enabled(void)90 static inline bool kaslr_memory_enabled(void)
91 {
92 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
93 }
94
kaslr_offset(void)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. The name must be unique within
112 * the file, and somewhat descriptive. The size is in bytes. Must be
113 * used at file scope.
114 *
115 * (This uses a temp function to wrap the asm so we can pass it the
116 * size parameter; otherwise we wouldn't be able to. We can't use a
117 * "section" attribute on a normal variable because it always ends up
118 * being @progbits, which ends up allocating space in the vmlinux
119 * executable.)
120 */
121 #define RESERVE_BRK(name,sz) \
122 static void __section(".discard.text") __used notrace \
123 __brk_reservation_fn_##name##__(void) { \
124 asm volatile ( \
125 ".pushsection .brk_reservation,\"aw\",@nobits;" \
126 ".brk." #name ":" \
127 " 1:.skip %c0;" \
128 " .size .brk." #name ", . - 1b;" \
129 " .popsection" \
130 : : "i" (sz)); \
131 }
132
133 /* Helper for reserving space for arrays of things */
134 #define RESERVE_BRK_ARRAY(type, name, entries) \
135 type *name; \
136 RESERVE_BRK(name, sizeof(type) * entries)
137
138 extern void probe_roms(void);
139 #ifdef __i386__
140
141 asmlinkage void __init i386_start_kernel(void);
142
143 #else
144 asmlinkage void __init x86_64_start_kernel(char *real_mode);
145 asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
146
147 #endif /* __i386__ */
148 #endif /* _SETUP */
149 #else
150 #define RESERVE_BRK(name,sz) \
151 .pushsection .brk_reservation,"aw",@nobits; \
152 .brk.name: \
153 1: .skip sz; \
154 .size .brk.name,.-1b; \
155 .popsection
156 #endif /* __ASSEMBLY__ */
157 #endif /* _ASM_X86_SETUP_H */
158
