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 36 void vsmp_init(void); 37 #else 38 static inline void vsmp_init(void) { } 39 #endif 40 41 struct pt_regs; 42 43 void setup_bios_corruption_check(void); 44 void early_platform_quirks(void); 45 46 extern unsigned long saved_video_mode; 47 48 extern void reserve_standard_io_resources(void); 49 extern void i386_reserve_resources(void); 50 extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp); 51 extern void startup_64_setup_gdt_idt(void); 52 extern void early_setup_idt(void); 53 extern void __init do_early_exception(struct pt_regs *regs, int trapnr); 54 55 #ifdef CONFIG_X86_INTEL_MID 56 extern void x86_intel_mid_early_setup(void); 57 #else 58 static inline void x86_intel_mid_early_setup(void) { } 59 #endif 60 61 #ifdef CONFIG_X86_INTEL_CE 62 extern void x86_ce4100_early_setup(void); 63 #else 64 static 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 */ 75 extern struct boot_params boot_params; 76 extern char _text[]; 77 78 static 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 */ 88 static inline bool kaslr_memory_enabled(void) 89 { 90 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN); 91 } 92 93 static 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 */ 105 extern unsigned long _brk_end; 106 void *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] 119 120 extern void probe_roms(void); 121 122 void clear_bss(void); 123 124 #ifdef __i386__ 125 126 asmlinkage void __init __noreturn i386_start_kernel(void); 127 void __init mk_early_pgtbl_32(void); 128 129 #else 130 asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode); 131 asmlinkage 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" 140 SYM_DATA_START(__brk_\name) 141 .skip \size 142 SYM_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