arch/x86/include/asm/setup.h

   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 */