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 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 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 startup_64_load_idt(void *vc_handler); 56 extern void early_setup_idt(void); 57 extern void __init do_early_exception(struct pt_regs *regs, int trapnr); 58 59 #ifdef CONFIG_X86_INTEL_MID 60 extern void x86_intel_mid_early_setup(void); 61 #else 62 static inline void x86_intel_mid_early_setup(void) { } 63 #endif 64 65 #ifdef CONFIG_X86_INTEL_CE 66 extern void x86_ce4100_early_setup(void); 67 #else 68 static inline void x86_ce4100_early_setup(void) { } 69 #endif 70 71 #ifndef _SETUP 72 73 #include <asm/espfix.h> 74 #include <linux/kernel.h> 75 76 /* 77 * This is set up by the setup-routine at boot-time 78 */ 79 extern struct boot_params boot_params; 80 extern char _text[]; 81 82 static inline bool kaslr_enabled(void) 83 { 84 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) && 85 !!(boot_params.hdr.loadflags & KASLR_FLAG); 86 } 87 88 /* 89 * Apply no randomization if KASLR was disabled at boot or if KASAN 90 * is enabled. KASAN shadow mappings rely on regions being PGD aligned. 91 */ 92 static inline bool kaslr_memory_enabled(void) 93 { 94 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN); 95 } 96 97 static inline unsigned long kaslr_offset(void) 98 { 99 return (unsigned long)&_text - __START_KERNEL; 100 } 101 102 /* 103 * Do NOT EVER look at the BIOS memory size location. 104 * It does not work on many machines. 105 */ 106 #define LOWMEMSIZE() (0x9f000) 107 108 /* exceedingly early brk-like allocator */ 109 extern unsigned long _brk_end; 110 void *extend_brk(size_t size, size_t align); 111 112 /* 113 * Reserve space in the .brk section, which is a block of memory from which the 114 * caller is allowed to allocate very early (before even memblock is available) 115 * by calling extend_brk(). All allocated memory will be eventually converted 116 * to memblock. Any leftover unallocated memory will be freed. 117 * 118 * The size is in bytes. 119 */ 120 #define RESERVE_BRK(name, size) \ 121 __section(".bss..brk") __aligned(1) __used \ 122 static char __brk_##name[size] 123 124 extern void probe_roms(void); 125 126 void clear_bss(void); 127 128 #ifdef __i386__ 129 130 asmlinkage void __init __noreturn i386_start_kernel(void); 131 void __init mk_early_pgtbl_32(void); 132 133 #else 134 asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode); 135 asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data); 136 137 #endif /* __i386__ */ 138 #endif /* _SETUP */ 139 140 #ifdef CONFIG_CMDLINE_BOOL 141 extern bool builtin_cmdline_added __ro_after_init; 142 #else 143 #define builtin_cmdline_added 0 144 #endif 145 146 #else /* __ASSEMBLER__ */ 147 148 .macro __RESERVE_BRK name, size 149 .pushsection .bss..brk, "aw" 150 SYM_DATA_START(__brk_\name) 151 .skip \size 152 SYM_DATA_END(__brk_\name) 153 .popsection 154 .endm 155 156 #define RESERVE_BRK(name, size) __RESERVE_BRK name, size 157 158 #endif /* __ASSEMBLER__ */ 159 160 #endif /* _ASM_X86_SETUP_H */ 161