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 unsigned long __startup_secondary_64(void); 54 extern void startup_64_setup_env(unsigned long physbase); 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 #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 81 static 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 */ 91 static inline bool kaslr_memory_enabled(void) 92 { 93 return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN); 94 } 95 96 static 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. The name must be unique within 113 * the file, and somewhat descriptive. The size is in bytes. Must be 114 * used at file scope. 115 * 116 * (This uses a temp function to wrap the asm so we can pass it the 117 * size parameter; otherwise we wouldn't be able to. We can't use a 118 * "section" attribute on a normal variable because it always ends up 119 * being @progbits, which ends up allocating space in the vmlinux 120 * executable.) 121 */ 122 #define RESERVE_BRK(name,sz) \ 123 static void __section(".discard.text") __noendbr __used notrace \ 124 __brk_reservation_fn_##name##__(void) { \ 125 asm volatile ( \ 126 ".pushsection .brk_reservation,\"aw\",@nobits;" \ 127 ".brk." #name ":" \ 128 " 1:.skip %c0;" \ 129 " .size .brk." #name ", . - 1b;" \ 130 " .popsection" \ 131 : : "i" (sz)); \ 132 } 133 134 extern void probe_roms(void); 135 #ifdef __i386__ 136 137 asmlinkage void __init i386_start_kernel(void); 138 139 #else 140 asmlinkage void __init x86_64_start_kernel(char *real_mode); 141 asmlinkage void __init x86_64_start_reservations(char *real_mode_data); 142 143 #endif /* __i386__ */ 144 #endif /* _SETUP */ 145 #else 146 #define RESERVE_BRK(name,sz) \ 147 .pushsection .brk_reservation,"aw",@nobits; \ 148 .brk.name: \ 149 1: .skip sz; \ 150 .size .brk.name,.-1b; \ 151 .popsection 152 #endif /* __ASSEMBLY__ */ 153 #endif /* _ASM_X86_SETUP_H */ 154