1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_SETUP_H
3 #define _ASM_X86_SETUP_H
5 #include <uapi/asm/setup.h>
7 #define COMMAND_LINE_SIZE 2048
9 #include <linux/linkage.h>
10 #include <asm/page_types.h>
15 #include <linux/pfn.h>
17 * Reserved space for vmalloc and iomap - defined in asm/page.h
19 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
20 #define MAX_NONPAE_PFN (1 << 20)
24 #define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
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 */
31 #include <asm/bootparam.h>
32 #include <asm/x86_init.h>
34 extern u64 relocated_ramdisk;
36 /* Interrupt control for vSMPowered x86_64 systems */
40 static inline void vsmp_init(void) { }
45 void setup_bios_corruption_check(void);
46 void early_platform_quirks(void);
48 extern unsigned long saved_video_mode;
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 unsigned long __startup_secondary_64(void);
54 extern void startup_64_setup_env(unsigned long physbase);
55 extern void early_setup_idt(void);
56 extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
58 #ifdef CONFIG_X86_INTEL_MID
59 extern void x86_intel_mid_early_setup(void);
61 static inline void x86_intel_mid_early_setup(void) { }
64 #ifdef CONFIG_X86_INTEL_CE
65 extern void x86_ce4100_early_setup(void);
67 static inline void x86_ce4100_early_setup(void) { }
72 #include <asm/espfix.h>
73 #include <linux/kernel.h>
76 * This is set up by the setup-routine at boot-time
78 extern struct boot_params boot_params;
81 static inline bool kaslr_enabled(void)
83 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
84 !!(boot_params.hdr.loadflags & KASLR_FLAG);
88 * Apply no randomization if KASLR was disabled at boot or if KASAN
89 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
91 static inline bool kaslr_memory_enabled(void)
93 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
96 static inline unsigned long kaslr_offset(void)
98 return (unsigned long)&_text - __START_KERNEL;
102 * Do NOT EVER look at the BIOS memory size location.
103 * It does not work on many machines.
105 #define LOWMEMSIZE() (0x9f000)
107 /* exceedingly early brk-like allocator */
108 extern unsigned long _brk_end;
109 void *extend_brk(size_t size, size_t align);
112 * Reserve space in the brk section. The name must be unique within
113 * the file, and somewhat descriptive. The size is in bytes. Must be
114 * used at file scope.
116 * (This uses a temp function to wrap the asm so we can pass it the
117 * size parameter; otherwise we wouldn't be able to. We can't use a
118 * "section" attribute on a normal variable because it always ends up
119 * being @progbits, which ends up allocating space in the vmlinux
122 #define RESERVE_BRK(name,sz) \
123 static void __section(".discard.text") __noendbr __used notrace \
124 __brk_reservation_fn_##name##__(void) { \
126 ".pushsection .brk_reservation,\"aw\",@nobits;" \
129 " .size .brk." #name ", . - 1b;" \
134 extern void probe_roms(void);
137 asmlinkage void __init i386_start_kernel(void);
140 asmlinkage void __init x86_64_start_kernel(char *real_mode);
141 asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
143 #endif /* __i386__ */
146 #define RESERVE_BRK(name,sz) \
147 .pushsection .brk_reservation,"aw",@nobits; \
150 .size .brk.name,.-1b; \
152 #endif /* __ASSEMBLY__ */
153 #endif /* _ASM_X86_SETUP_H */