LXR linux/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
  32extern u64 relocated_ramdisk;
  33
  34/* Interrupt control for vSMPowered x86_64 systems */
  35#ifdef CONFIG_X86_64
  36void vsmp_init(void);
  37#else
  38static inline void vsmp_init(void) { }
  39#endif
  40
  41void setup_bios_corruption_check(void);
  42
  43extern unsigned long saved_video_mode;
  44
  45extern void reserve_standard_io_resources(void);
  46extern void i386_reserve_resources(void);
  47
  48#ifdef CONFIG_X86_INTEL_MID
  49extern void x86_intel_mid_early_setup(void);
  50#else
  51static inline void x86_intel_mid_early_setup(void) { }
  52#endif
  53
  54#ifdef CONFIG_X86_INTEL_CE
  55extern void x86_ce4100_early_setup(void);
  56#else
  57static 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 */
  68extern struct boot_params boot_params;
  69extern char _text[];
  70
  71static inline bool kaslr_enabled(void)
  72{
  73        return !!(boot_params.hdr.loadflags & KASLR_FLAG);
  74}
  75
  76static 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 */
  88extern unsigned long _brk_end;
  89void *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
 119extern void probe_roms(void);
 120#ifdef __i386__
 121
 122asmlinkage void __init i386_start_kernel(void);
 123
 124#else
 125asmlinkage void __init x86_64_start_kernel(char *real_mode);
 126asmlinkage 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:                                              \
 1341:      .skip sz;                                       \
 135        .size .brk.name,.-1b;                           \
 136        .popsection
 137#endif /* __ASSEMBLY__ */
 138#endif /* _ASM_X86_SETUP_H */
 139