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