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 __ASSEMBLER__ 31 #include <linux/cache.h> 32 33 #include <asm/bootparam.h> 34 #include <asm/x86_init.h> 35 36 /* Interrupt control for vSMPowered x86_64 systems */ 37 #ifdef CONFIG_X86_64 38 void vsmp_init(void); 39 #else vsmp_init(void)40static inline void vsmp_init(void) { } 41 #endif 42 43 struct pt_regs; 44 45 void setup_bios_corruption_check(void); 46 void early_platform_quirks(void); 47 48 extern unsigned long saved_video_mode; 49 extern unsigned long acpi_realmode_flags; 50 51 extern void reserve_standard_io_resources(void); 52 extern void i386_reserve_resources(void); 53 extern unsigned long __startup_64(unsigned long p2v_offset, struct boot_params *bp); 54 extern void startup_64_setup_gdt_idt(void); 55 extern void early_setup_idt(void); 56 extern void __init do_early_exception(struct pt_regs *regs, int trapnr); 57 58 #ifdef CONFIG_X86_INTEL_MID 59 extern void x86_intel_mid_early_setup(void); 60 #else x86_intel_mid_early_setup(void)61static inline void x86_intel_mid_early_setup(void) { } 62 #endif 63 64 #ifdef CONFIG_X86_INTEL_CE 65 extern void x86_ce4100_early_setup(void); 66 #else x86_ce4100_early_setup(void)67static inline void x86_ce4100_early_setup(void) { } 68 #endif 69 70 #ifndef _SETUP 71 72 #include <asm/espfix.h> 73 #include <linux/kernel.h> 74 75 /* 76 * This is set up by the setup-routine at boot-time 77 */ 78 extern struct boot_params boot_params; 79 extern char _text[]; 80 kaslr_enabled(void)81static inline bool kaslr_enabled(void) 82 { 83 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) && 84 !!(boot_params.hdr.loadflags & KASLR_FLAG); 85 } 86 87 /* 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. 90 */ kaslr_memory_enabled(void)91static inline bool kaslr_memory_enabled(void) 92 { 93 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN); 94 } 95 kaslr_offset(void)96static inline unsigned long kaslr_offset(void) 97 { 98 return (unsigned long)&_text - __START_KERNEL; 99 } 100 101 /* 102 * Do NOT EVER look at the BIOS memory size location. 103 * It does not work on many machines. 104 */ 105 #define LOWMEMSIZE() (0x9f000) 106 107 /* exceedingly early brk-like allocator */ 108 extern unsigned long _brk_end; 109 void *extend_brk(size_t size, size_t align); 110 111 /* 112 * Reserve space in the .brk section, which is a block of memory from which the 113 * caller is allowed to allocate very early (before even memblock is available) 114 * by calling extend_brk(). All allocated memory will be eventually converted 115 * to memblock. Any leftover unallocated memory will be freed. 116 * 117 * The size is in bytes. 118 */ 119 #define RESERVE_BRK(name, size) \ 120 __section(".bss..brk") __aligned(1) __used \ 121 static char __brk_##name[size] 122 123 extern void probe_roms(void); 124 125 void clear_bss(void); 126 127 #ifdef __i386__ 128 129 asmlinkage void __init __noreturn i386_start_kernel(void); 130 void __init mk_early_pgtbl_32(void); 131 132 #else 133 asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode); 134 asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data); 135 136 #endif /* __i386__ */ 137 #endif /* _SETUP */ 138 139 #ifdef CONFIG_CMDLINE_BOOL 140 extern bool builtin_cmdline_added __ro_after_init; 141 #else 142 #define builtin_cmdline_added 0 143 #endif 144 145 #else /* __ASSEMBLER__ */ 146 147 .macro __RESERVE_BRK name, size 148 .pushsection .bss..brk, "aw" 149 SYM_DATA_START(__brk_\name) 150 .skip \size 151 SYM_DATA_END(__brk_\name) 152 .popsection 153 .endm 154 155 #define RESERVE_BRK(name, size) __RESERVE_BRK name, size 156 157 #endif /* __ASSEMBLER__ */ 158 159 #endif /* _ASM_X86_SETUP_H */ 160