1 #ifndef _ASM_X86_SETUP_H 2 #define _ASM_X86_SETUP_H 3 4 #include <uapi/asm/setup.h> 5 6 #define COMMAND_LINE_SIZE 2048 7 8 #include <linux/linkage.h> 9 10 #ifdef __i386__ 11 12 #include <linux/pfn.h> 13 /* 14 * Reserved space for vmalloc and iomap - defined in asm/page.h 15 */ 16 #define MAXMEM_PFN PFN_DOWN(MAXMEM) 17 #define MAX_NONPAE_PFN (1 << 20) 18 19 #endif /* __i386__ */ 20 21 #define PARAM_SIZE 4096 /* sizeof(struct boot_params) */ 22 23 #define OLD_CL_MAGIC 0xA33F 24 #define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */ 25 #define NEW_CL_POINTER 0x228 /* Relative to real mode data */ 26 27 #ifndef __ASSEMBLY__ 28 #include <asm/bootparam.h> 29 #include <asm/x86_init.h> 30 31 extern u64 relocated_ramdisk; 32 33 /* Interrupt control for vSMPowered x86_64 systems */ 34 #ifdef CONFIG_X86_64 35 void vsmp_init(void); 36 #else 37 static inline void vsmp_init(void) { } 38 #endif 39 40 void setup_bios_corruption_check(void); 41 42 extern unsigned long saved_video_mode; 43 44 extern void reserve_standard_io_resources(void); 45 extern void i386_reserve_resources(void); 46 extern void setup_default_timer_irq(void); 47 48 #ifdef CONFIG_X86_INTEL_MID 49 extern void x86_intel_mid_early_setup(void); 50 #else 51 static inline void x86_intel_mid_early_setup(void) { } 52 #endif 53 54 #ifdef CONFIG_X86_INTEL_CE 55 extern void x86_ce4100_early_setup(void); 56 #else 57 static inline void x86_ce4100_early_setup(void) { } 58 #endif 59 60 #ifndef _SETUP 61 62 #include <asm/espfix.h> 63 #include <linux/kernel.h> 64 65 /* 66 * This is set up by the setup-routine at boot-time 67 */ 68 extern struct boot_params boot_params; 69 extern char _text[]; 70 71 static inline bool kaslr_enabled(void) 72 { 73 return !!(boot_params.hdr.loadflags & KASLR_FLAG); 74 } 75 76 static inline unsigned long kaslr_offset(void) 77 { 78 return (unsigned long)&_text - __START_KERNEL; 79 } 80 81 /* 82 * Do NOT EVER look at the BIOS memory size location. 83 * It does not work on many machines. 84 */ 85 #define LOWMEMSIZE() (0x9f000) 86 87 /* exceedingly early brk-like allocator */ 88 extern unsigned long _brk_end; 89 void *extend_brk(size_t size, size_t align); 90 91 /* 92 * Reserve space in the brk section. The name must be unique within 93 * the file, and somewhat descriptive. The size is in bytes. Must be 94 * used at file scope. 95 * 96 * (This uses a temp function to wrap the asm so we can pass it the 97 * size parameter; otherwise we wouldn't be able to. We can't use a 98 * "section" attribute on a normal variable because it always ends up 99 * being @progbits, which ends up allocating space in the vmlinux 100 * executable.) 101 */ 102 #define RESERVE_BRK(name,sz) \ 103 static void __section(.discard.text) __used notrace \ 104 __brk_reservation_fn_##name##__(void) { \ 105 asm volatile ( \ 106 ".pushsection .brk_reservation,\"aw\",@nobits;" \ 107 ".brk." #name ":" \ 108 " 1:.skip %c0;" \ 109 " .size .brk." #name ", . - 1b;" \ 110 " .popsection" \ 111 : : "i" (sz)); \ 112 } 113 114 /* Helper for reserving space for arrays of things */ 115 #define RESERVE_BRK_ARRAY(type, name, entries) \ 116 type *name; \ 117 RESERVE_BRK(name, sizeof(type) * entries) 118 119 extern void probe_roms(void); 120 #ifdef __i386__ 121 122 asmlinkage void __init i386_start_kernel(void); 123 124 #else 125 asmlinkage void __init x86_64_start_kernel(char *real_mode); 126 asmlinkage void __init x86_64_start_reservations(char *real_mode_data); 127 128 #endif /* __i386__ */ 129 #endif /* _SETUP */ 130 #else 131 #define RESERVE_BRK(name,sz) \ 132 .pushsection .brk_reservation,"aw",@nobits; \ 133 .brk.name: \ 134 1: .skip sz; \ 135 .size .brk.name,.-1b; \ 136 .popsection 137 #endif /* __ASSEMBLY__ */ 138 #endif /* _ASM_X86_SETUP_H */ 139