| 1 |
1275 |
phoenix |
#ifndef X86_64_PDA_H
|
| 2 |
|
|
#define X86_64_PDA_H
|
| 3 |
|
|
|
| 4 |
|
|
#include <linux/cache.h>
|
| 5 |
|
|
|
| 6 |
|
|
/* Per processor datastructure. %gs points to it while the kernel runs */
|
| 7 |
|
|
/* To use a new field with the *_pda macros it needs to be added to tools/offset.c */
|
| 8 |
|
|
struct x8664_pda {
|
| 9 |
|
|
unsigned long kernelstack; /* TOS for current process */
|
| 10 |
|
|
unsigned long oldrsp; /* user rsp for system call */
|
| 11 |
|
|
unsigned long irqrsp; /* Old rsp for interrupts. */
|
| 12 |
|
|
struct task_struct *pcurrent; /* Current process */
|
| 13 |
|
|
int irqcount; /* Irq nesting counter. Starts with -1 */
|
| 14 |
|
|
int cpunumber; /* Logical CPU number */
|
| 15 |
|
|
/* XXX: could be a single list */
|
| 16 |
|
|
unsigned long *pgd_quick;
|
| 17 |
|
|
unsigned long *pmd_quick;
|
| 18 |
|
|
unsigned long *pte_quick;
|
| 19 |
|
|
unsigned long pgtable_cache_sz;
|
| 20 |
|
|
char *irqstackptr; /* top of irqstack */
|
| 21 |
|
|
unsigned long volatile *level4_pgt;
|
| 22 |
|
|
} ____cacheline_aligned;
|
| 23 |
|
|
|
| 24 |
|
|
#define PDA_STACKOFFSET (5*8)
|
| 25 |
|
|
|
| 26 |
|
|
#define IRQSTACK_ORDER 2
|
| 27 |
|
|
#define IRQSTACKSIZE (PAGE_SIZE << IRQSTACK_ORDER)
|
| 28 |
|
|
|
| 29 |
|
|
extern struct x8664_pda cpu_pda[];
|
| 30 |
|
|
|
| 31 |
|
|
/*
|
| 32 |
|
|
* There is no fast way to get the base address of the PDA, all the accesses
|
| 33 |
|
|
* have to mention %fs/%gs. So it needs to be done this Torvaldian way.
|
| 34 |
|
|
*/
|
| 35 |
|
|
#define sizeof_field(type,field) (sizeof(((type *)0)->field))
|
| 36 |
|
|
#define typeof_field(type,field) typeof(((type *)0)->field)
|
| 37 |
|
|
|
| 38 |
|
|
extern void __bad_pda_field(void);
|
| 39 |
|
|
/* Don't use offsetof because it requires too much infrastructure */
|
| 40 |
|
|
#define pda_offset(field) ((unsigned long)&((struct x8664_pda *)0)->field)
|
| 41 |
|
|
|
| 42 |
|
|
#define pda_to_op(op,field,val) do { \
|
| 43 |
|
|
switch (sizeof_field(struct x8664_pda, field)) { \
|
| 44 |
|
|
case 2: asm volatile(op "w %0,%%gs:%P1" :: "r" (val), "i"(pda_offset(field)):"memory"); break; \
|
| 45 |
|
|
case 4: asm volatile(op "l %0,%%gs:%P1" :: "r" (val), "i"(pda_offset(field)):"memory"); break; \
|
| 46 |
|
|
case 8: asm volatile(op "q %0,%%gs:%P1" :: "r" (val), "i"(pda_offset(field)):"memory"); break; \
|
| 47 |
|
|
default: __bad_pda_field(); \
|
| 48 |
|
|
} \
|
| 49 |
|
|
} while (0)
|
| 50 |
|
|
|
| 51 |
|
|
|
| 52 |
|
|
#define pda_from_op(op,field) ({ \
|
| 53 |
|
|
typedef typeof_field(struct x8664_pda, field) T__; T__ ret__; \
|
| 54 |
|
|
switch (sizeof_field(struct x8664_pda, field)) { \
|
| 55 |
|
|
case 2: asm volatile(op "w %%gs:%P1,%0":"=r" (ret__): "i" (pda_offset(field)):"memory"); break; \
|
| 56 |
|
|
case 4: asm volatile(op "l %%gs:%P1,%0":"=r" (ret__): "i" (pda_offset(field)):"memory"); break; \
|
| 57 |
|
|
case 8: asm volatile(op "q %%gs:%P1,%0":"=r" (ret__): "i" (pda_offset(field)):"memory"); break; \
|
| 58 |
|
|
default: __bad_pda_field(); \
|
| 59 |
|
|
} \
|
| 60 |
|
|
ret__; })
|
| 61 |
|
|
|
| 62 |
|
|
|
| 63 |
|
|
#define read_pda(field) pda_from_op("mov",field)
|
| 64 |
|
|
#define write_pda(field,val) pda_to_op("mov",field,val)
|
| 65 |
|
|
#define add_pda(field,val) pda_to_op("add",field,val)
|
| 66 |
|
|
#define sub_pda(field,val) pda_to_op("sub",field,val)
|
| 67 |
|
|
|
| 68 |
|
|
#endif
|
