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
   5 #define boot_text __attribute__((section(".boot.text")))
   6 #define boot_data __attribute__((section(".boot.data")))
   7 #define boot_bss __attribute__((section(".boot.bss")))
   8
   9 /*
  10     Bridge the far symbol to the vicinity.
  11
  12     Which is a workaround for relocation
  13     issue where symbol define in kernel
  14     code is too far away from the boot code.
  15 */
  16 #ifdef CONFIG_ARCH_X86_64
  17 #define bridge_farsym(far_sym)          \
  18     asm(                                \
  19         ".section .boot.bss\n"         \
  20         ".align 8\n"                    \
  21         ".globl __lc_" #far_sym "\n"    \
  22         "__lc_" #far_sym ":\n"          \
  23         ".8byte " #far_sym "\n"         \
  24         ".previous\n"                   \
  25     );                                  \
  26     extern unsigned long __lc_##far_sym[];
  27 #define __far(far_sym)  (__lc_##far_sym[0])
  28
  29 #else
  30 #define bridge_farsym(far_sym) extern u8_t far_sym[];
  31 #define __far(far_sym) ((ptr_t)far_sym)
  32
  33 #endif
  34
  35 ptr_t remap_kernel();
  36
  37 #endif /* __LUNAIX_BSTAGE_H */