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 12 #ifdef __i386__ 13 14 #include <linux/pfn.h> 15 /* 16 * Reserved space for vmalloc and iomap - defined in asm/page.h 17 */ 18 #define MAXMEM_PFN PFN_DOWN(MAXMEM) 19 #define MAX_NONPAE_PFN (1 << 20) 20 21 #endif /* __i386__ */ 22 23 #define PARAM_SIZE 4096 /* sizeof(struct boot_params) */ 24 25 #define OLD_CL_MAGIC 0xA33F 26 #define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */ 27 #define NEW_CL_POINTER 0x228 /* Relative to real mode data */ 28 29 #ifndef __ASSEMBLY__ 30 #include <asm/bootparam.h> 31 #include <asm/x86_init.h> 32 33 extern u64 relocated_ramdisk; 34 35 /* Interrupt control for vSMPowered x86_64 systems */ 36 #ifdef CONFIG_X86_64 37 void vsmp_init(void); 38 #else 39 static inline void vsmp_init(void) { } 40 #endif 41 42 struct pt_regs; 43 44 void setup_bios_corruption_check(void); 45 void early_platform_quirks(void); 46 47 extern unsigned long saved_video_mode; 48 49 extern void reserve_standard_io_resources(void); 50 extern void i386_reserve_resources(void); 51 extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp); 52 extern unsigned long __startup_secondary_64(void); 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. The name must be unique within 112 * the file, and somewhat descriptive. The size is in bytes. Must be 113 * used at file scope. 114 * 115 * (This uses a temp function to wrap the asm so we can pass it the 116 * size parameter; otherwise we wouldn't be able to. We can't use a 117 * "section" attribute on a normal variable because it always ends up 118 * being @progbits, which ends up allocating space in the vmlinux 119 * executable.) 120 */ 121 #define RESERVE_BRK(name,sz) \ 122 static void __section(".discard.text") __used notrace \ 123 __brk_reservation_fn_##name##__(void) { \ 124 asm volatile ( \ 125 ".pushsection .brk_reservation,\"aw\",@nobits;" \ 126 ".brk." #name ":" \ 127 " 1:.skip %c0;" \ 128 " .size .brk." #name ", . - 1b;" \ 129 " .popsection" \ 130 : : "i" (sz)); \ 131 } 132 133 /* Helper for reserving space for arrays of things */ 134 #define RESERVE_BRK_ARRAY(type, name, entries) \ 135 type *name; \ 136 RESERVE_BRK(name, sizeof(type) * entries) 137 138 extern void probe_roms(void); 139 #ifdef __i386__ 140 141 asmlinkage void __init i386_start_kernel(void); 142 143 #else 144 asmlinkage void __init x86_64_start_kernel(char *real_mode); 145 asmlinkage void __init x86_64_start_reservations(char *real_mode_data); 146 147 #endif /* __i386__ */ 148 #endif /* _SETUP */ 149 #else 150 #define RESERVE_BRK(name,sz) \ 151 .pushsection .brk_reservation,"aw",@nobits; \ 152 .brk.name: \ 153 1: .skip sz; \ 154 .size .brk.name,.-1b; \ 155 .popsection 156 #endif /* __ASSEMBLY__ */ 157 #endif /* _ASM_X86_SETUP_H */ 158