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 #if DEBUG_STKSZ > EXCEPTION_STKSZ
17 unsigned long debugstack; /* #DB/#BP stack. */
19 int irqcount; /* Irq nesting counter. Starts with -1 */
20 int cpunumber; /* Logical CPU number */
21 char *irqstackptr; /* top of irqstack */
22 int nodenumber; /* number of current node */
23 unsigned int __softirq_pending;
24 unsigned int __nmi_count; /* number of NMI on this CPUs */
26 struct mm_struct *active_mm;
27 unsigned apic_timer_irqs;
28 } ____cacheline_aligned_in_smp;
30 extern struct x8664_pda *_cpu_pda[];
31 extern struct x8664_pda boot_cpu_pda[];
33 #define cpu_pda(i) (_cpu_pda[i])
36 * There is no fast way to get the base address of the PDA, all the accesses
37 * have to mention %fs/%gs. So it needs to be done this Torvaldian way.
39 extern void __bad_pda_field(void);
41 /* proxy_pda doesn't actually exist, but tell gcc it is accessed
42 for all PDA accesses so it gets read/write dependencies right. */
43 extern struct x8664_pda _proxy_pda;
45 #define pda_offset(field) offsetof(struct x8664_pda, field)
47 #define pda_to_op(op,field,val) do { \
48 typedef typeof(_proxy_pda.field) T__; \
49 switch (sizeof(_proxy_pda.field)) { \
51 asm(op "w %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \
52 "ri" ((T__)val),"i"(pda_offset(field))); break; \
54 asm(op "l %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \
55 "ri" ((T__)val),"i"(pda_offset(field))); break; \
57 asm(op "q %1,%%gs:%P2": "+m" (_proxy_pda.field) : \
58 "ri" ((T__)val),"i"(pda_offset(field))); break; \
59 default: __bad_pda_field(); \
63 #define pda_from_op(op,field) ({ \
64 typeof(_proxy_pda.field) ret__; \
65 switch (sizeof(_proxy_pda.field)) { \
67 asm(op "w %%gs:%P1,%0":"=r" (ret__):\
68 "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\
70 asm(op "l %%gs:%P1,%0":"=r" (ret__):\
71 "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\
73 asm(op "q %%gs:%P1,%0":"=r" (ret__):\
74 "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\
75 default: __bad_pda_field(); \
80 #define read_pda(field) pda_from_op("mov",field)
81 #define write_pda(field,val) pda_to_op("mov",field,val)
82 #define add_pda(field,val) pda_to_op("add",field,val)
83 #define sub_pda(field,val) pda_to_op("sub",field,val)
84 #define or_pda(field,val) pda_to_op("or",field,val)
88 #define PDA_STACKOFFSET (5*8)