setup.h (3627B)
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 34extern u64 relocated_ramdisk; 35 36/* Interrupt control for vSMPowered x86_64 systems */ 37#ifdef CONFIG_X86_64 38void vsmp_init(void); 39#else 40static inline void vsmp_init(void) { } 41#endif 42 43struct pt_regs; 44 45void setup_bios_corruption_check(void); 46void early_platform_quirks(void); 47 48extern unsigned long saved_video_mode; 49 50extern void reserve_standard_io_resources(void); 51extern void i386_reserve_resources(void); 52extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp); 53extern void startup_64_setup_env(unsigned long physbase); 54extern void early_setup_idt(void); 55extern void __init do_early_exception(struct pt_regs *regs, int trapnr); 56 57#ifdef CONFIG_X86_INTEL_MID 58extern void x86_intel_mid_early_setup(void); 59#else 60static inline void x86_intel_mid_early_setup(void) { } 61#endif 62 63#ifdef CONFIG_X86_INTEL_CE 64extern void x86_ce4100_early_setup(void); 65#else 66static 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 */ 77extern struct boot_params boot_params; 78extern char _text[]; 79 80static 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 */ 90static inline bool kaslr_memory_enabled(void) 91{ 92 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN); 93} 94 95static 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 */ 107extern unsigned long _brk_end; 108void *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 122extern void probe_roms(void); 123 124void clear_bss(void); 125 126#ifdef __i386__ 127 128asmlinkage void __init i386_start_kernel(void); 129 130#else 131asmlinkage void __init x86_64_start_kernel(char *real_mode); 132asmlinkage void __init x86_64_start_reservations(char *real_mode_data); 133 134#endif /* __i386__ */ 135#endif /* _SETUP */ 136 137#else /* __ASSEMBLY */ 138 139.macro __RESERVE_BRK name, size 140 .pushsection .bss..brk, "aw" 141SYM_DATA_START(__brk_\name) 142 .skip \size 143SYM_DATA_END(__brk_\name) 144 .popsection 145.endm 146 147#define RESERVE_BRK(name, size) __RESERVE_BRK name, size 148 149#endif /* __ASSEMBLY__ */ 150 151#endif /* _ASM_X86_SETUP_H */