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 #include <asm/page_types.h> 10 11 #ifdef __i386__ 12 13 #include <linux/pfn.h> 14 /* 15 * Reserved space for vmalloc and iomap - defined in asm/page.h 16 */ 17 #define MAXMEM_PFN PFN_DOWN(MAXMEM) 18 #define MAX_NONPAE_PFN (1 << 20) 19 20 #endif /* __i386__ */ 21 22 #define PARAM_SIZE 4096 /* sizeof(struct boot_params) */ 23 24 #define OLD_CL_MAGIC 0xA33F 25 #define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */ 26 #define NEW_CL_POINTER 0x228 /* Relative to real mode data */ 27 28 #ifndef __ASSEMBLY__ 29 #include <asm/bootparam.h> 30 #include <asm/x86_init.h> 31 32 extern u64 relocated_ramdisk; 33 34 /* Interrupt control for vSMPowered x86_64 systems */ 35 #ifdef CONFIG_X86_64 36 void vsmp_init(void); 37 #else 38 static inline void vsmp_init(void) { } 39 #endif 40 41 void setup_bios_corruption_check(void); 42 43 extern unsigned long saved_video_mode; 44 45 extern void reserve_standard_io_resources(void); 46 extern void i386_reserve_resources(void); 47 extern void setup_default_timer_irq(void); 48 49 #ifdef CONFIG_X86_INTEL_MID 50 extern void x86_intel_mid_early_setup(void); 51 #else 52 static inline void x86_intel_mid_early_setup(void) { } 53 #endif 54 55 #ifdef CONFIG_X86_INTEL_CE 56 extern void x86_ce4100_early_setup(void); 57 #else 58 static inline void x86_ce4100_early_setup(void) { } 59 #endif 60 61 #ifndef _SETUP 62 63 #include <asm/espfix.h> 64 #include <linux/kernel.h> 65 66 /* 67 * This is set up by the setup-routine at boot-time 68 */ 69 extern struct boot_params boot_params; 70 extern char _text[]; 71 72 static inline bool kaslr_enabled(void) 73 { 74 return !!(boot_params.hdr.loadflags & KASLR_FLAG); 75 } 76 77 static inline unsigned long kaslr_offset(void) 78 { 79 return (unsigned long)&_text - __START_KERNEL; 80 } 81 82 /* 83 * Do NOT EVER look at the BIOS memory size location. 84 * It does not work on many machines. 85 */ 86 #define LOWMEMSIZE() (0x9f000) 87 88 /* exceedingly early brk-like allocator */ 89 extern unsigned long _brk_end; 90 void *extend_brk(size_t size, size_t align); 91 92 /* 93 * Reserve space in the brk section. The name must be unique within 94 * the file, and somewhat descriptive. The size is in bytes. Must be 95 * used at file scope. 96 * 97 * (This uses a temp function to wrap the asm so we can pass it the 98 * size parameter; otherwise we wouldn't be able to. We can't use a 99 * "section" attribute on a normal variable because it always ends up 100 * being @progbits, which ends up allocating space in the vmlinux 101 * executable.) 102 */ 103 #define RESERVE_BRK(name,sz) \ 104 static void __section(.discard.text) __used notrace \ 105 __brk_reservation_fn_##name##__(void) { \ 106 asm volatile ( \ 107 ".pushsection .brk_reservation,\"aw\",@nobits;" \ 108 ".brk." #name ":" \ 109 " 1:.skip %c0;" \ 110 " .size .brk." #name ", . - 1b;" \ 111 " .popsection" \ 112 : : "i" (sz)); \ 113 } 114 115 /* Helper for reserving space for arrays of things */ 116 #define RESERVE_BRK_ARRAY(type, name, entries) \ 117 type *name; \ 118 RESERVE_BRK(name, sizeof(type) * entries) 119 120 extern void probe_roms(void); 121 #ifdef __i386__ 122 123 asmlinkage void __init i386_start_kernel(void); 124 125 #else 126 asmlinkage void __init x86_64_start_kernel(char *real_mode); 127 asmlinkage void __init x86_64_start_reservations(char *real_mode_data); 128 129 #endif /* __i386__ */ 130 #endif /* _SETUP */ 131 #else 132 #define RESERVE_BRK(name,sz) \ 133 .pushsection .brk_reservation,"aw",@nobits; \ 134 .brk.name: \ 135 1: .skip sz; \ 136 .size .brk.name,.-1b; \ 137 .popsection 138 #endif /* __ASSEMBLY__ */ 139 #endif /* _ASM_X86_SETUP_H */ 140