| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100 |
- /*
- Per-processor Data Areas
- Jeremy Fitzhardinge <jeremy@goop.org> 2006
- Based on asm-x86_64/pda.h by Andi Kleen.
- */
- #ifndef _I386_PDA_H
- #define _I386_PDA_H
- #include <linux/stddef.h>
- #include <linux/types.h>
- struct i386_pda
- {
- struct i386_pda *_pda; /* pointer to self */
- int cpu_number;
- struct task_struct *pcurrent; /* current process */
- struct pt_regs *irq_regs;
- };
- extern struct i386_pda *_cpu_pda[];
- #define cpu_pda(i) (_cpu_pda[i])
- #define pda_offset(field) offsetof(struct i386_pda, field)
- extern void __bad_pda_field(void);
- /* This variable is never instantiated. It is only used as a stand-in
- for the real per-cpu PDA memory, so that gcc can understand what
- memory operations the inline asms() below are performing. This
- eliminates the need to make the asms volatile or have memory
- clobbers, so gcc can readily analyse them. */
- extern struct i386_pda _proxy_pda;
- #define pda_to_op(op,field,val) \
- do { \
- typedef typeof(_proxy_pda.field) T__; \
- if (0) { T__ tmp__; tmp__ = (val); } \
- switch (sizeof(_proxy_pda.field)) { \
- case 1: \
- asm(op "b %1,%%gs:%c2" \
- : "+m" (_proxy_pda.field) \
- :"ri" ((T__)val), \
- "i"(pda_offset(field))); \
- break; \
- case 2: \
- asm(op "w %1,%%gs:%c2" \
- : "+m" (_proxy_pda.field) \
- :"ri" ((T__)val), \
- "i"(pda_offset(field))); \
- break; \
- case 4: \
- asm(op "l %1,%%gs:%c2" \
- : "+m" (_proxy_pda.field) \
- :"ri" ((T__)val), \
- "i"(pda_offset(field))); \
- break; \
- default: __bad_pda_field(); \
- } \
- } while (0)
- #define pda_from_op(op,field) \
- ({ \
- typeof(_proxy_pda.field) ret__; \
- switch (sizeof(_proxy_pda.field)) { \
- case 1: \
- asm(op "b %%gs:%c1,%0" \
- : "=r" (ret__) \
- : "i" (pda_offset(field)), \
- "m" (_proxy_pda.field)); \
- break; \
- case 2: \
- asm(op "w %%gs:%c1,%0" \
- : "=r" (ret__) \
- : "i" (pda_offset(field)), \
- "m" (_proxy_pda.field)); \
- break; \
- case 4: \
- asm(op "l %%gs:%c1,%0" \
- : "=r" (ret__) \
- : "i" (pda_offset(field)), \
- "m" (_proxy_pda.field)); \
- break; \
- default: __bad_pda_field(); \
- } \
- ret__; })
- /* Return a pointer to a pda field */
- #define pda_addr(field) \
- ((typeof(_proxy_pda.field) *)((unsigned char *)read_pda(_pda) + \
- pda_offset(field)))
- #define read_pda(field) pda_from_op("mov",field)
- #define write_pda(field,val) pda_to_op("mov",field,val)
- #define add_pda(field,val) pda_to_op("add",field,val)
- #define sub_pda(field,val) pda_to_op("sub",field,val)
- #define or_pda(field,val) pda_to_op("or",field,val)
- #endif /* _I386_PDA_H */
|
