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 void setup_bios_corruption_check(void); 43 void early_platform_quirks(void); 44 45 extern unsigned long saved_video_mode; 46 47 extern void reserve_standard_io_resources(void); 48 extern void i386_reserve_resources(void); 49 50 #ifdef CONFIG_X86_INTEL_MID 51 extern void x86_intel_mid_early_setup(void); 52 #else 53 static inline void x86_intel_mid_early_setup(void) { } 54 #endif 55 56 #ifdef CONFIG_X86_INTEL_CE 57 extern void x86_ce4100_early_setup(void); 58 #else 59 static inline void x86_ce4100_early_setup(void) { } 60 #endif 61 62 #ifndef _SETUP 63 64 #include <asm/espfix.h> 65 #include <linux/kernel.h> 66 67 /* 68 * This is set up by the setup-routine at boot-time 69 */ 70 extern struct boot_params boot_params; 71 extern char _text[]; 72 73 static inline bool kaslr_enabled(void) 74 { 75 return !!(boot_params.hdr.loadflags & KASLR_FLAG); 76 } 77 78 static inline unsigned long kaslr_offset(void) 79 { 80 return (unsigned long)&_text - __START_KERNEL; 81 } 82 83 /* 84 * Do NOT EVER look at the BIOS memory size location. 85 * It does not work on many machines. 86 */ 87 #define LOWMEMSIZE() (0x9f000) 88 89 /* exceedingly early brk-like allocator */ 90 extern unsigned long _brk_end; 91 void *extend_brk(size_t size, size_t align); 92 93 /* 94 * Reserve space in the brk section. The name must be unique within 95 * the file, and somewhat descriptive. The size is in bytes. Must be 96 * used at file scope. 97 * 98 * (This uses a temp function to wrap the asm so we can pass it the 99 * size parameter; otherwise we wouldn't be able to. We can't use a 100 * "section" attribute on a normal variable because it always ends up 101 * being @progbits, which ends up allocating space in the vmlinux 102 * executable.) 103 */ 104 #define RESERVE_BRK(name,sz) \ 105 static void __section(.discard.text) __used notrace \ 106 __brk_reservation_fn_##name##__(void) { \ 107 asm volatile ( \ 108 ".pushsection .brk_reservation,\"aw\",@nobits;" \ 109 ".brk." #name ":" \ 110 " 1:.skip %c0;" \ 111 " .size .brk." #name ", . - 1b;" \ 112 " .popsection" \ 113 : : "i" (sz)); \ 114 } 115 116 /* Helper for reserving space for arrays of things */ 117 #define RESERVE_BRK_ARRAY(type, name, entries) \ 118 type *name; \ 119 RESERVE_BRK(name, sizeof(type) * entries) 120 121 extern void probe_roms(void); 122 #ifdef __i386__ 123 124 asmlinkage void __init i386_start_kernel(void); 125 126 #else 127 asmlinkage void __init x86_64_start_kernel(char *real_mode); 128 asmlinkage void __init x86_64_start_reservations(char *real_mode_data); 129 130 #endif /* __i386__ */ 131 #endif /* _SETUP */ 132 #else 133 #define RESERVE_BRK(name,sz) \ 134 .pushsection .brk_reservation,"aw",@nobits; \ 135 .brk.name: \ 136 1: .skip sz; \ 137 .size .brk.name,.-1b; \ 138 .popsection 139 #endif /* __ASSEMBLY__ */ 140 #endif /* _ASM_X86_SETUP_H */ 141