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 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 61 static 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 67 static inline void x86_ce4100_early_setup(void) { } 68 #endif 69 70 #include <linux/kexec_handover.h> 71 72 #ifndef _SETUP 73 74 #include <asm/espfix.h> 75 #include <linux/kernel.h> 76 77 /* 78 * This is set up by the setup-routine at boot-time 79 */ 80 extern struct boot_params boot_params; 81 extern char _text[]; 82 83 static inline bool kaslr_enabled(void) 84 { 85 return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) && 86 !!(boot_params.hdr.loadflags & KASLR_FLAG); 87 } 88 89 /* 90 * Apply no randomization if KASLR was disabled at boot or if KASAN 91 * is enabled. KASAN shadow mappings rely on regions being PGD aligned. 92 */ 93 static inline bool kaslr_memory_enabled(void) 94 { 95 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN); 96 } 97 98 static inline unsigned long kaslr_offset(void) 99 { 100 return (unsigned long)&_text - __START_KERNEL; 101 } 102 103 /* 104 * Do NOT EVER look at the BIOS memory size location. 105 * It does not work on many machines. 106 */ 107 #define LOWMEMSIZE() (0x9f000) 108 109 /* exceedingly early brk-like allocator */ 110 extern unsigned long _brk_end; 111 void *extend_brk(size_t size, size_t align); 112 113 /* 114 * Reserve space in the .brk section, which is a block of memory from which the 115 * caller is allowed to allocate very early (before even memblock is available) 116 * by calling extend_brk(). All allocated memory will be eventually converted 117 * to memblock. Any leftover unallocated memory will be freed. 118 * 119 * The size is in bytes. 120 */ 121 #define RESERVE_BRK(name, size) \ 122 __section(".bss..brk") __aligned(1) __used \ 123 static char __brk_##name[size] 124 125 extern void probe_roms(void); 126 127 void clear_bss(void); 128 129 #ifdef __i386__ 130 131 asmlinkage void __init __noreturn i386_start_kernel(void); 132 void __init mk_early_pgtbl_32(void); 133 134 #else 135 asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode); 136 asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data); 137 138 #endif /* __i386__ */ 139 #endif /* _SETUP */ 140 141 #ifdef CONFIG_CMDLINE_BOOL 142 extern bool builtin_cmdline_added __ro_after_init; 143 #else 144 #define builtin_cmdline_added 0 145 #endif 146 147 #else /* __ASSEMBLER__ */ 148 149 .macro __RESERVE_BRK name, size 150 .pushsection .bss..brk, "aw" 151 SYM_DATA_START(__brk_\name) 152 .skip \size 153 SYM_DATA_END(__brk_\name) 154 .popsection 155 .endm 156 157 #define RESERVE_BRK(name, size) __RESERVE_BRK name, size 158 159 #endif /* __ASSEMBLER__ */ 160 161 #endif /* _ASM_X86_SETUP_H */ 162