5 #include <linux/stddef.h>
6 #include <linux/types.h>
7 #include <linux/cache.h>
10 /* Per processor datastructure. %gs points to it while the kernel runs */
12 struct task_struct *pcurrent; /* Current process */
13 unsigned long data_offset; /* Per cpu data offset from linker address */
14 unsigned long kernelstack; /* top of kernel stack for current */
15 unsigned long oldrsp; /* user rsp for system call */
16 int irqcount; /* Irq nesting counter. Starts with -1 */
17 int cpunumber; /* Logical CPU number */
18 char *irqstackptr; /* top of irqstack */
19 int nodenumber; /* number of current node */
20 unsigned int __softirq_pending;
21 unsigned int __nmi_count; /* number of NMI on this CPUs */
23 struct mm_struct *active_mm;
24 unsigned apic_timer_irqs;
25 } ____cacheline_aligned_in_smp;
27 extern struct x8664_pda *_cpu_pda[];
28 extern struct x8664_pda boot_cpu_pda[];
30 #define cpu_pda(i) (_cpu_pda[i])
33 * There is no fast way to get the base address of the PDA, all the accesses
34 * have to mention %fs/%gs. So it needs to be done this Torvaldian way.
36 extern void __bad_pda_field(void);
38 /* proxy_pda doesn't actually exist, but tell gcc it is accessed
39 for all PDA accesses so it gets read/write dependencies right. */
40 extern struct x8664_pda _proxy_pda;
42 #define pda_offset(field) offsetof(struct x8664_pda, field)
44 #define pda_to_op(op,field,val) do { \
45 typedef typeof(_proxy_pda.field) T__; \
46 switch (sizeof(_proxy_pda.field)) { \
48 asm(op "w %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \
49 "ri" ((T__)val),"i"(pda_offset(field))); break; \
51 asm(op "l %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \
52 "ri" ((T__)val),"i"(pda_offset(field))); break; \
54 asm(op "q %1,%%gs:%P2": "+m" (_proxy_pda.field) : \
55 "ri" ((T__)val),"i"(pda_offset(field))); break; \
56 default: __bad_pda_field(); \
60 #define pda_from_op(op,field) ({ \
61 typeof(_proxy_pda.field) ret__; \
62 switch (sizeof(_proxy_pda.field)) { \
64 asm(op "w %%gs:%P1,%0":"=r" (ret__):\
65 "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\
67 asm(op "l %%gs:%P1,%0":"=r" (ret__):\
68 "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\
70 asm(op "q %%gs:%P1,%0":"=r" (ret__):\
71 "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\
72 default: __bad_pda_field(); \
77 #define read_pda(field) pda_from_op("mov",field)
78 #define write_pda(field,val) pda_to_op("mov",field,val)
79 #define add_pda(field,val) pda_to_op("add",field,val)
80 #define sub_pda(field,val) pda_to_op("sub",field,val)
81 #define or_pda(field,val) pda_to_op("or",field,val)
85 #define PDA_STACKOFFSET (5*8)