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