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>
14 #include <linux/pfn.h>
16 * Reserved space for vmalloc and iomap - defined in asm/page.h
18 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
19 #define MAX_NONPAE_PFN (1 << 20)
23 #define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
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 */
30 #include <asm/bootparam.h>
31 #include <asm/x86_init.h>
33 extern u64 relocated_ramdisk;
35 /* Interrupt control for vSMPowered x86_64 systems */
39 static inline void vsmp_init(void) { }
42 void setup_bios_corruption_check(void);
43 void early_platform_quirks(void);
45 extern unsigned long saved_video_mode;
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);
53 #ifdef CONFIG_X86_INTEL_MID
54 extern void x86_intel_mid_early_setup(void);
56 static inline void x86_intel_mid_early_setup(void) { }
59 #ifdef CONFIG_X86_INTEL_CE
60 extern void x86_ce4100_early_setup(void);
62 static inline void x86_ce4100_early_setup(void) { }
67 #include <asm/espfix.h>
68 #include <linux/kernel.h>
71 * This is set up by the setup-routine at boot-time
73 extern struct boot_params boot_params;
76 static inline bool kaslr_enabled(void)
78 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
79 !!(boot_params.hdr.loadflags & KASLR_FLAG);
83 * Apply no randomization if KASLR was disabled at boot or if KASAN
84 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
86 static inline bool kaslr_memory_enabled(void)
88 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
91 static inline unsigned long kaslr_offset(void)
93 return (unsigned long)&_text - __START_KERNEL;
97 * Do NOT EVER look at the BIOS memory size location.
98 * It does not work on many machines.
100 #define LOWMEMSIZE() (0x9f000)
102 /* exceedingly early brk-like allocator */
103 extern unsigned long _brk_end;
104 void *extend_brk(size_t size, size_t align);
107 * Reserve space in the brk section. The name must be unique within
108 * the file, and somewhat descriptive. The size is in bytes. Must be
109 * used at file scope.
111 * (This uses a temp function to wrap the asm so we can pass it the
112 * size parameter; otherwise we wouldn't be able to. We can't use a
113 * "section" attribute on a normal variable because it always ends up
114 * being @progbits, which ends up allocating space in the vmlinux
117 #define RESERVE_BRK(name,sz) \
118 static void __section(.discard.text) __used notrace \
119 __brk_reservation_fn_##name##__(void) { \
121 ".pushsection .brk_reservation,\"aw\",@nobits;" \
124 " .size .brk." #name ", . - 1b;" \
129 /* Helper for reserving space for arrays of things */
130 #define RESERVE_BRK_ARRAY(type, name, entries) \
132 RESERVE_BRK(name, sizeof(type) * entries)
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 */