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);
50 #ifdef CONFIG_X86_INTEL_MID
51 extern void x86_intel_mid_early_setup(void);
53 static inline void x86_intel_mid_early_setup(void) { }
56 #ifdef CONFIG_X86_INTEL_CE
57 extern void x86_ce4100_early_setup(void);
59 static inline void x86_ce4100_early_setup(void) { }
64 #include <asm/espfix.h>
65 #include <linux/kernel.h>
68 * This is set up by the setup-routine at boot-time
70 extern struct boot_params boot_params;
73 static inline bool kaslr_enabled(void)
75 return !!(boot_params.hdr.loadflags & KASLR_FLAG);
78 static inline unsigned long kaslr_offset(void)
80 return (unsigned long)&_text - __START_KERNEL;
84 * Do NOT EVER look at the BIOS memory size location.
85 * It does not work on many machines.
87 #define LOWMEMSIZE() (0x9f000)
89 /* exceedingly early brk-like allocator */
90 extern unsigned long _brk_end;
91 void *extend_brk(size_t size, size_t align);
94 * Reserve space in the .brk section, which is a block of memory from which the
95 * caller is allowed to allocate very early (before even memblock is available)
96 * by calling extend_brk(). All allocated memory will be eventually converted
97 * to memblock. Any leftover unallocated memory will be freed.
99 * The size is in bytes.
101 #define RESERVE_BRK(name, size) \
102 __section(.bss..brk) __aligned(1) __used \
103 static char __brk_##name[size]
105 /* Helper for reserving space for arrays of things */
106 #define RESERVE_BRK_ARRAY(type, name, entries) \
108 RESERVE_BRK(name, sizeof(type) * entries)
110 extern void probe_roms(void);
113 asmlinkage void __init i386_start_kernel(void);
116 asmlinkage void __init x86_64_start_kernel(char *real_mode);
117 asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
119 #endif /* __i386__ */
122 #else /* __ASSEMBLY */
124 .macro __RESERVE_BRK name, size
125 .pushsection .bss..brk, "aw"
132 #define RESERVE_BRK(name, size) __RESERVE_BRK name, size
134 #endif /* __ASSEMBLY__ */
136 #endif /* _ASM_X86_SETUP_H */