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
  42struct pt_regs;
  43
  44void setup_bios_corruption_check(void);
  45void early_platform_quirks(void);
  46
  47extern unsigned long saved_video_mode;
  48
  49extern void reserve_standard_io_resources(void);
  50extern void i386_reserve_resources(void);
  51extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
  52extern unsigned long __startup_secondary_64(void);
  53extern void startup_64_setup_env(unsigned long physbase);
  54extern void early_setup_idt(void);
  55extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
  56
  57#ifdef CONFIG_X86_INTEL_MID
  58extern void x86_intel_mid_early_setup(void);
  59#else
  60static inline void x86_intel_mid_early_setup(void) { }
  61#endif
  62
  63#ifdef CONFIG_X86_INTEL_CE
  64extern void x86_ce4100_early_setup(void);
  65#else
  66static inline void x86_ce4100_early_setup(void) { }
  67#endif
  68
  69#ifndef _SETUP
  70
  71#include <asm/espfix.h>
  72#include <linux/kernel.h>
  73
  74/*
  75 * This is set up by the setup-routine at boot-time
  76 */
  77extern struct boot_params boot_params;
  78extern char _text[];
  79
  80static inline bool kaslr_enabled(void)
  81{
  82        return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
  83                !!(boot_params.hdr.loadflags & KASLR_FLAG);
  84}
  85
  86/*
  87 * Apply no randomization if KASLR was disabled at boot or if KASAN
  88 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
  89 */
  90static inline bool kaslr_memory_enabled(void)
  91{
  92        return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
  93}
  94
  95static inline unsigned long kaslr_offset(void)
  96{
  97        return (unsigned long)&_text - __START_KERNEL;
  98}
  99
 100/*
 101 * Do NOT EVER look at the BIOS memory size location.
 102 * It does not work on many machines.
 103 */
 104#define LOWMEMSIZE()    (0x9f000)
 105
 106/* exceedingly early brk-like allocator */
 107extern unsigned long _brk_end;
 108void *extend_brk(size_t size, size_t align);
 109
 110/*
 111 * Reserve space in the brk section.  The name must be unique within
 112 * the file, and somewhat descriptive.  The size is in bytes.  Must be
 113 * used at file scope.
 114 *
 115 * (This uses a temp function to wrap the asm so we can pass it the
 116 * size parameter; otherwise we wouldn't be able to.  We can't use a
 117 * "section" attribute on a normal variable because it always ends up
 118 * being @progbits, which ends up allocating space in the vmlinux
 119 * executable.)
 120 */
 121#define RESERVE_BRK(name,sz)                                            \
 122        static void __section(".discard.text") __used notrace           \
 123        __brk_reservation_fn_##name##__(void) {                         \
 124                asm volatile (                                          \
 125                        ".pushsection .brk_reservation,\"aw\",@nobits;" \
 126                        ".brk." #name ":"                               \
 127                        " 1:.skip %c0;"                                 \
 128                        " .size .brk." #name ", . - 1b;"                \
 129                        " .popsection"                                  \
 130                        : : "i" (sz));                                  \
 131        }
 132
 133extern void probe_roms(void);
 134#ifdef __i386__
 135
 136asmlinkage void __init i386_start_kernel(void);
 137
 138#else
 139asmlinkage void __init x86_64_start_kernel(char *real_mode);
 140asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
 141
 142#endif /* __i386__ */
 143#endif /* _SETUP */
 144#else
 145#define RESERVE_BRK(name,sz)                            \
 146        .pushsection .brk_reservation,"aw",@nobits;     \
 147.brk.name:                                              \
 1481:      .skip sz;                                       \
 149        .size .brk.name,.-1b;                           \
 150        .popsection
 151#endif /* __ASSEMBLY__ */
 152#endif /* _ASM_X86_SETUP_H */
 153