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 extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
  50 extern unsigned long __startup_secondary_64(void);
  51 extern int early_make_pgtable(unsigned long address);
  52
  53 #ifdef CONFIG_X86_INTEL_MID
  54 extern void x86_intel_mid_early_setup(void);
  55 #else
  56 static inline void x86_intel_mid_early_setup(void) { }
  57 #endif
  58
  59 #ifdef CONFIG_X86_INTEL_CE
  60 extern void x86_ce4100_early_setup(void);
  61 #else
  62 static 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  */
  73 extern struct boot_params boot_params;
  74 extern char _text[];
  75
  76 static inline bool kaslr_enabled(void)
  77 {
  78         return !!(boot_params.hdr.loadflags & KASLR_FLAG);
  79 }
  80
  81 static 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 */
  93 extern unsigned long _brk_end;
  94 void *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
 124 extern void probe_roms(void);
 125 #ifdef __i386__
 126
 127 asmlinkage void __init i386_start_kernel(void);
 128
 129 #else
 130 asmlinkage void __init x86_64_start_kernel(char *real_mode);
 131 asmlinkage 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:                                              \
 139 1:      .skip sz;                                       \
 140         .size .brk.name,.-1b;                           \
 141         .popsection
 142 #endif /* __ASSEMBLY__ */
 143 #endif /* _ASM_X86_SETUP_H */