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
  33 extern u64 relocated_ramdisk;
  34
  35 /* Interrupt control for vSMPowered x86_64 systems */
  36 #ifdef CONFIG_X86_64
  37 void vsmp_init(void);
  38 #else
  39 static inline void vsmp_init(void) { }
  40 #endif
  41
  42 void setup_bios_corruption_check(void);
  43 void early_platform_quirks(void);
  44
  45 extern unsigned long saved_video_mode;
  46
  47 extern void reserve_standard_io_resources(void);
  48 extern void i386_reserve_resources(void);
  49
  50 #ifdef CONFIG_X86_INTEL_MID
  51 extern void x86_intel_mid_early_setup(void);
  52 #else
  53 static inline void x86_intel_mid_early_setup(void) { }
  54 #endif
  55
  56 #ifdef CONFIG_X86_INTEL_CE
  57 extern void x86_ce4100_early_setup(void);
  58 #else
  59 static 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  */
  70 extern struct boot_params boot_params;
  71 extern char _text[];
  72
  73 static inline bool kaslr_enabled(void)
  74 {
  75         return !!(boot_params.hdr.loadflags & KASLR_FLAG);
  76 }
  77
  78 static 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 */
  90 extern unsigned long _brk_end;
  91 void *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
 121 extern void probe_roms(void);
 122 #ifdef __i386__
 123
 124 asmlinkage void __init i386_start_kernel(void);
 125
 126 #else
 127 asmlinkage void __init x86_64_start_kernel(char *real_mode);
 128 asmlinkage 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:                                              \
 136 1:      .skip sz;                                       \
 137         .size .brk.name,.-1b;                           \
 138         .popsection
 139 #endif /* __ASSEMBLY__ */
 140 #endif /* _ASM_X86_SETUP_H */