lunaix-os/arch/x86/includes/sys/boot/bstage.h

   1 #ifndef __LUNAIX_BSTAGE_H
   2 #define __LUNAIX_BSTAGE_H
   3 #include <lunaix/types.h>
   4 #include <lunaix/boot_generic.h>
   5
   6 extern ptr_t __multiboot_addr;
   7
   8 extern u8_t __kboot_start[];
   9 extern u8_t __kboot_end[];
  10
  11 #define boot_text __attribute__((section(".boot.text")))
  12 #define boot_data __attribute__((section(".boot.data")))
  13 #define boot_bss  __attribute__((section(".boot.bss")))
  14
  15 /*
  16     Bridge the far symbol to the vicinity.
  17
  18     Which is a workaround for relocation
  19     issue where symbol define in kernel
  20     code is too far away from the boot code.
  21 */
  22 #ifdef CONFIG_ARCH_X86_64
  23 #define __bridge_farsym(far_sym)        \
  24     asm(                                \
  25         ".section .boot.data\n"         \
  26         ".align 8\n"                    \
  27         ".globl __lc_" #far_sym "\n"    \
  28         "__lc_" #far_sym ":\n"          \
  29         ".8byte " #far_sym "\n"         \
  30         ".previous\n"                   \
  31     );                                  \
  32     extern unsigned long __lc_##far_sym[];
  33 #define bridge_farsym(far_sym)  __bridge_farsym(far_sym)
  34
  35 #define ___far(far_sym)  (__lc_##far_sym[0])
  36 #define __far(far_sym)  ___far(far_sym)
  37
  38 #else
  39 #define __bridge_farsym(far_sym)    extern unsigned long far_sym[]
  40 #define ___far(far_sym)             ((ptr_t)far_sym)
  41 #define bridge_farsym(far_sym)      __bridge_farsym(far_sym);
  42 #define __far(far_sym)              ___far(far_sym)
  43
  44 #endif
  45
  46 ptr_t
  47 remap_kernel();
  48
  49 #endif /* __LUNAIX_BSTAGE_H */