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; /* 0 Current process */
13 unsigned long data_offset; /* 8 Per cpu data offset from linker
15 unsigned long kernelstack; /* 16 top of kernel stack for current */
16 unsigned long oldrsp; /* 24 user rsp for system call */
17 int irqcount; /* 32 Irq nesting counter. Starts with -1 */
18 int cpunumber; /* 36 Logical CPU number */
19 char *irqstackptr; /* 40 top of irqstack */
20 int nodenumber; /* number of current node */
21 unsigned int __softirq_pending;
22 unsigned int __nmi_count; /* number of NMI on this CPUs */
24 struct mm_struct *active_mm;
25 unsigned apic_timer_irqs;
26 } ____cacheline_aligned_in_smp;
28 extern struct x8664_pda *_cpu_pda[];
29 extern struct x8664_pda boot_cpu_pda[];
31 #define cpu_pda(i) (_cpu_pda[i])
34 * There is no fast way to get the base address of the PDA, all the accesses
35 * have to mention %fs/%gs. So it needs to be done this Torvaldian way.
37 extern void __bad_pda_field(void);
39 /* proxy_pda doesn't actually exist, but tell gcc it is accessed
40 for all PDA accesses so it gets read/write dependencies right. */
41 extern struct x8664_pda _proxy_pda;
43 #define pda_offset(field) offsetof(struct x8664_pda, field)
45 #define pda_to_op(op,field,val) do { \
46 typedef typeof(_proxy_pda.field) T__; \
47 switch (sizeof(_proxy_pda.field)) { \
49 asm(op "w %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \
50 "ri" ((T__)val),"i"(pda_offset(field))); break; \
52 asm(op "l %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \
53 "ri" ((T__)val),"i"(pda_offset(field))); break; \
55 asm(op "q %1,%%gs:%P2": "+m" (_proxy_pda.field) : \
56 "ri" ((T__)val),"i"(pda_offset(field))); break; \
57 default: __bad_pda_field(); \
61 #define pda_from_op(op,field) ({ \
62 typeof(_proxy_pda.field) ret__; \
63 switch (sizeof(_proxy_pda.field)) { \
65 asm(op "w %%gs:%P1,%0":"=r" (ret__):\
66 "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\
68 asm(op "l %%gs:%P1,%0":"=r" (ret__):\
69 "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\
71 asm(op "q %%gs:%P1,%0":"=r" (ret__):\
72 "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\
73 default: __bad_pda_field(); \
78 #define read_pda(field) pda_from_op("mov",field)
79 #define write_pda(field,val) pda_to_op("mov",field,val)
80 #define add_pda(field,val) pda_to_op("add",field,val)
81 #define sub_pda(field,val) pda_to_op("sub",field,val)
82 #define or_pda(field,val) pda_to_op("or",field,val)
86 #define PDA_STACKOFFSET (5*8)