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);
  49extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
  50extern unsigned long __startup_secondary_64(void);
  51extern int early_make_pgtable(unsigned long address);
  52
  53#ifdef CONFIG_X86_INTEL_MID
  54extern void x86_intel_mid_early_setup(void);
  55#else
  56static inline void x86_intel_mid_early_setup(void) { }
  57#endif
  58
  59#ifdef CONFIG_X86_INTEL_CE
  60extern void x86_ce4100_early_setup(void);
  61#else
  62static inline void x86_ce4100_early_setup(void) { }
  63#endif
  64
  65#ifndef _SETUP
  66
  67#include <asm/espfix.h>
  68#include <linux/kernel.h>
  69
  70/*
  71 * This is set up by the setup-routine at boot-time
  72 */
  73extern struct boot_params boot_params;
  74extern char _text[];
  75
  76static inline bool kaslr_enabled(void)
  77{
  78        return !!(boot_params.hdr.loadflags & KASLR_FLAG);
  79}
  80
  81static inline unsigned long kaslr_offset(void)
  82{
  83        return (unsigned long)&_text - __START_KERNEL;
  84}
  85
  86/*
  87 * Do NOT EVER look at the BIOS memory size location.
  88 * It does not work on many machines.
  89 */
  90#define LOWMEMSIZE()    (0x9f000)
  91
  92/* exceedingly early brk-like allocator */
  93extern unsigned long _brk_end;
  94void *extend_brk(size_t size, size_t align);
  95
  96/*
  97 * Reserve space in the brk section.  The name must be unique within
  98 * the file, and somewhat descriptive.  The size is in bytes.  Must be
  99 * used at file scope.
 100 *
 101 * (This uses a temp function to wrap the asm so we can pass it the
 102 * size parameter; otherwise we wouldn't be able to.  We can't use a
 103 * "section" attribute on a normal variable because it always ends up
 104 * being @progbits, which ends up allocating space in the vmlinux
 105 * executable.)
 106 */
 107#define RESERVE_BRK(name,sz)                                            \
 108        static void __section(.discard.text) __used notrace             \
 109        __brk_reservation_fn_##name##__(void) {                         \
 110                asm volatile (                                          \
 111                        ".pushsection .brk_reservation,\"aw\",@nobits;" \
 112                        ".brk." #name ":"                               \
 113                        " 1:.skip %c0;"                                 \
 114                        " .size .brk." #name ", . - 1b;"                \
 115                        " .popsection"                                  \
 116                        : : "i" (sz));                                  \
 117        }
 118
 119/* Helper for reserving space for arrays of things */
 120#define RESERVE_BRK_ARRAY(type, name, entries)          \
 121        type *name;                                     \
 122        RESERVE_BRK(name, sizeof(type) * entries)
 123
 124extern void probe_roms(void);
 125#ifdef __i386__
 126
 127asmlinkage void __init i386_start_kernel(void);
 128
 129#else
 130asmlinkage void __init x86_64_start_kernel(char *real_mode);
 131asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
 132
 133#endif /* __i386__ */
 134#endif /* _SETUP */
 135#else
 136#define RESERVE_BRK(name,sz)                            \
 137        .pushsection .brk_reservation,"aw",@nobits;     \
 138.brk.name:                                              \
 1391:      .skip sz;                                       \
 140        .size .brk.name,.-1b;                           \
 141        .popsection
 142#endif /* __ASSEMBLY__ */
 143#endif /* _ASM_X86_SETUP_H */
 144