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 extern u64 relocated_ramdisk; 35 36 /* Interrupt control for vSMPowered x86_64 systems */ 37 #ifdef CONFIG_X86_64 38 void vsmp_init(void); 39 #else 40 static 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 50 extern void reserve_standard_io_resources(void); 51 extern void i386_reserve_resources(void); 52 extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp); 53 extern void startup_64_setup_env(unsigned long physbase); 54 extern void early_setup_idt(void); 55 extern void __init do_early_exception(struct pt_regs *regs, int trapnr); 56 57 #ifdef CONFIG_X86_INTEL_MID 58 extern void x86_intel_mid_early_setup(void); 59 #else 60 static inline void x86_intel_mid_early_setup(void) { } 61 #endif 62 63 #ifdef CONFIG_X86_INTEL_CE 64 extern void x86_ce4100_early_setup(void); 65 #else 66 static 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 */ 77 extern struct boot_params boot_params; 78 extern char _text[]; 79 80 static 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 */ 90 static inline bool kaslr_memory_enabled(void) 91 { 92 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN); 93 } 94 95 static 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 */ 107 extern unsigned long _brk_end; 108 void *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] 121 122 extern void probe_roms(void); 123 124 void clear_bss(void); 125 126 #ifdef __i386__ 127 128 asmlinkage void __init __noreturn i386_start_kernel(void); 129 130 #else 131 asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode); 132 asmlinkage void __init __noreturn 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" 141 SYM_DATA_START(__brk_\name) 142 .skip \size 143 SYM_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 */ 152