LXR linux/arch/x86/include/asm/setup.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_SETUP_H
   3#define _ASM_X86_SETUP_H
   4
   5#include <uapi/asm/setup.h>
   6
   7#define COMMAND_LINE_SIZE 2048
   8
   9#include <linux/linkage.h>
  10#include <asm/page_types.h>
  11
  12#ifdef __i386__
  13
  14#include <linux/pfn.h>
  15/*
  16 * Reserved space for vmalloc and iomap - defined in asm/page.h
  17 */
  18#define MAXMEM_PFN      PFN_DOWN(MAXMEM)
  19#define MAX_NONPAE_PFN  (1 << 20)
  20
  21#endif /* __i386__ */
  22
  23#define PARAM_SIZE 4096         /* sizeof(struct boot_params) */
  24
  25#define OLD_CL_MAGIC            0xA33F
  26#define OLD_CL_ADDRESS          0x020   /* Relative to real mode data */
  27#define NEW_CL_POINTER          0x228   /* Relative to real mode data */
  28
  29#ifndef __ASSEMBLY__
  30#include <asm/bootparam.h>
  31#include <asm/x86_init.h>
  32
  33extern u64 relocated_ramdisk;
  34
  35/* Interrupt control for vSMPowered x86_64 systems */
  36#ifdef CONFIG_X86_64
  37void vsmp_init(void);
  38#else
  39static inline void vsmp_init(void) { }
  40#endif
  41
  42void setup_bios_corruption_check(void);
  43void early_platform_quirks(void);
  44
  45extern unsigned long saved_video_mode;
  46
  47extern void reserve_standard_io_resources(void);
  48extern void i386_reserve_resources(void);
  49
  50#ifdef CONFIG_X86_INTEL_MID
  51extern void x86_intel_mid_early_setup(void);
  52#else
  53static inline void x86_intel_mid_early_setup(void) { }
  54#endif
  55
  56#ifdef CONFIG_X86_INTEL_CE
  57extern void x86_ce4100_early_setup(void);
  58#else
  59static inline void x86_ce4100_early_setup(void) { }
  60#endif
  61
  62#ifndef _SETUP
  63
  64#include <asm/espfix.h>
  65#include <linux/kernel.h>
  66
  67/*
  68 * This is set up by the setup-routine at boot-time
  69 */
  70extern struct boot_params boot_params;
  71extern char _text[];
  72
  73static inline bool kaslr_enabled(void)
  74{
  75        return !!(boot_params.hdr.loadflags & KASLR_FLAG);
  76}
  77
  78static inline unsigned long kaslr_offset(void)
  79{
  80        return (unsigned long)&_text - __START_KERNEL;
  81}
  82
  83/*
  84 * Do NOT EVER look at the BIOS memory size location.
  85 * It does not work on many machines.
  86 */
  87#define LOWMEMSIZE()    (0x9f000)
  88
  89/* exceedingly early brk-like allocator */
  90extern unsigned long _brk_end;
  91void *extend_brk(size_t size, size_t align);
  92
  93/*
  94 * Reserve space in the brk section.  The name must be unique within
  95 * the file, and somewhat descriptive.  The size is in bytes.  Must be
  96 * used at file scope.
  97 *
  98 * (This uses a temp function to wrap the asm so we can pass it the
  99 * size parameter; otherwise we wouldn't be able to.  We can't use a
 100 * "section" attribute on a normal variable because it always ends up
 101 * being @progbits, which ends up allocating space in the vmlinux
 102 * executable.)
 103 */
 104#define RESERVE_BRK(name,sz)                                            \
 105        static void __section(.discard.text) __used notrace             \
 106        __brk_reservation_fn_##name##__(void) {                         \
 107                asm volatile (                                          \
 108                        ".pushsection .brk_reservation,\"aw\",@nobits;" \
 109                        ".brk." #name ":"                               \
 110                        " 1:.skip %c0;"                                 \
 111                        " .size .brk." #name ", . - 1b;"                \
 112                        " .popsection"                                  \
 113                        : : "i" (sz));                                  \
 114        }
 115
 116/* Helper for reserving space for arrays of things */
 117#define RESERVE_BRK_ARRAY(type, name, entries)          \
 118        type *name;                                     \
 119        RESERVE_BRK(name, sizeof(type) * entries)
 120
 121extern void probe_roms(void);
 122#ifdef __i386__
 123
 124asmlinkage void __init i386_start_kernel(void);
 125
 126#else
 127asmlinkage void __init x86_64_start_kernel(char *real_mode);
 128asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
 129
 130#endif /* __i386__ */
 131#endif /* _SETUP */
 132#else
 133#define RESERVE_BRK(name,sz)                            \
 134        .pushsection .brk_reservation,"aw",@nobits;     \
 135.brk.name:                                              \
 1361:      .skip sz;                                       \
 137        .size .brk.name,.-1b;                           \
 138        .popsection
 139#endif /* __ASSEMBLY__ */
 140#endif /* _ASM_X86_SETUP_H */
 141