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 34/* Interrupt control for vSMPowered x86_64 systems */ 35#ifdef CONFIG_X86_64 36void vsmp_init(void); 37#else 38static inline void vsmp_init(void) { } 39#endif 40 41struct pt_regs; 42 43void setup_bios_corruption_check(void); 44void early_platform_quirks(void); 45 46extern unsigned long saved_video_mode; 47 48extern void reserve_standard_io_resources(void); 49extern void i386_reserve_resources(void); 50extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp); 51extern void startup_64_setup_gdt_idt(void); 52extern void early_setup_idt(void); 53extern void __init do_early_exception(struct pt_regs *regs, int trapnr); 54 55#ifdef CONFIG_X86_INTEL_MID 56extern void x86_intel_mid_early_setup(void); 57#else 58static inline void x86_intel_mid_early_setup(void) { } 59#endif 60 61#ifdef CONFIG_X86_INTEL_CE 62extern void x86_ce4100_early_setup(void); 63#else 64static inline void x86_ce4100_early_setup(void) { } 65#endif 66 67#ifndef _SETUP 68 69#include <asm/espfix.h> 70#include <linux/kernel.h> 71 72/* 73 * This is set up by the setup-routine at boot-time 74 */ 75extern struct boot_params boot_params; 76extern char _text[]; 77 78static inline bool kaslr_enabled(void) 79{ 80 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) && 81 !!(boot_params.hdr.loadflags & KASLR_FLAG); 82} 83 84/* 85 * Apply no randomization if KASLR was disabled at boot or if KASAN 86 * is enabled. KASAN shadow mappings rely on regions being PGD aligned. 87 */ 88static inline bool kaslr_memory_enabled(void) 89{ 90 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN); 91} 92 93static inline unsigned long kaslr_offset(void) 94{ 95 return (unsigned long)&_text - __START_KERNEL; 96} 97 98/* 99 * Do NOT EVER look at the BIOS memory size location. 100 * It does not work on many machines. 101 */ 102#define LOWMEMSIZE() (0x9f000) 103 104/* exceedingly early brk-like allocator */ 105extern unsigned long _brk_end; 106void *extend_brk(size_t size, size_t align); 107 108/* 109 * Reserve space in the .brk section, which is a block of memory from which the 110 * caller is allowed to allocate very early (before even memblock is available) 111 * by calling extend_brk(). All allocated memory will be eventually converted 112 * to memblock. Any leftover unallocated memory will be freed. 113 * 114 * The size is in bytes. 115 */ 116#define RESERVE_BRK(name, size) \ 117 __section(".bss..brk") __aligned(1) __used \ 118 static char __brk_##name[size] 119 120extern void probe_roms(void); 121 122void clear_bss(void); 123 124#ifdef __i386__ 125 126asmlinkage void __init __noreturn i386_start_kernel(void); 127void __init mk_early_pgtbl_32(void); 128 129#else 130asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode); 131asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data); 132 133#endif /* __i386__ */ 134#endif /* _SETUP */ 135 136#else /* __ASSEMBLY */ 137 138.macro __RESERVE_BRK name, size 139 .pushsection .bss..brk, "aw" 140SYM_DATA_START(__brk_\name) 141 .skip \size 142SYM_DATA_END(__brk_\name) 143 .popsection 144.endm 145 146#define RESERVE_BRK(name, size) __RESERVE_BRK name, size 147 148#endif /* __ASSEMBLY__ */ 149 150#endif /* _ASM_X86_SETUP_H */ 151