arch/x86_64-pc/kernel/tls.h

   1 #ifndef ASM_TLS_H
   2 #define ASM_TLS_H
   3
   4 typedef struct tls
   5 {
   6     struct ExecBase     *SysBase;
   7     void *              *KernelBase;    /* Base of kernel.resource */
   8 } tls_t;
   9
  10 #define TLS_OFFSET(name) ((char *)&(((tls_t *)0)->name)-(char *)0)
  11
  12 #define TLS_GET(name) \
  13     ({ \
  14         tls_t *__tls = (tls_t *)0; \
  15         typeof(__tls -> name) __ret; \
  16         switch (sizeof(__tls -> name)) { \
  17 case 2: asm volatile("movw %%gs:%P1,%0":"=r"(__ret):"n"(TLS_OFFSET(name)):"memory"); break; \
  18 case 4: asm volatile("movl %%gs:%P1,%0":"=r"(__ret):"n"(TLS_OFFSET(name)):"memory"); break; \
  19 case 8: asm volatile("movq %%gs:%P1,%0":"=r"(__ret):"n"(TLS_OFFSET(name)):"memory"); break; \
  20         } \
  21         __ret;  \
  22     })
  23
  24 #define TLS_SET(name, val) \
  25     do { \
  26         tls_t *__tls = (tls_t *)0; \
  27         typeof(__tls -> name) __set = val; \
  28         switch (sizeof(__tls -> name)) { \
  29 case 2: asm volatile("movw %0,%%gs:%P1"::"r"(__set),"n"(TLS_OFFSET(name)):"memory"); break; \
  30 case 4: asm volatile("movl %0,%%gs:%P1"::"r"(__set),"n"(TLS_OFFSET(name)):"memory"); break; \
  31 case 8: asm volatile("movq %0,%%gs:%P1"::"r"(__set),"n"(TLS_OFFSET(name)):"memory"); break; \
  32         } \
  33     } while(0);
  34
  35 #endif