5 #include <lwk/stddef.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 aspace *active_aspace;
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 void pda_init(unsigned int cpu, struct task_struct *task);
35 #define cpu_pda(i) (_cpu_pda[i])
38 * There is no fast way to get the base address of the PDA, all the accesses
39 * have to mention %fs/%gs. So it needs to be done this Torvaldian way.
41 #define sizeof_field(type,field) (sizeof(((type *)0)->field))
42 #define typeof_field(type,field) typeof(((type *)0)->field)
44 extern void __bad_pda_field(void);
46 #define pda_offset(field) offsetof(struct x8664_pda, field)
48 #define pda_to_op(op,field,val) do { \
49 typedef typeof_field(struct x8664_pda, field) T__; \
50 switch (sizeof_field(struct x8664_pda, field)) { \
52 asm volatile(op "w %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \
54 asm volatile(op "l %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \
56 asm volatile(op "q %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \
57 default: __bad_pda_field(); \
62 * AK: PDA read accesses should be neither volatile nor have an memory clobber.
63 * Unfortunately removing them causes all hell to break lose currently.
65 #define pda_from_op(op,field) ({ \
66 typeof_field(struct x8664_pda, field) ret__; \
67 switch (sizeof_field(struct x8664_pda, field)) { \
69 asm volatile(op "w %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\
71 asm volatile(op "l %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\
73 asm volatile(op "q %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\
74 default: __bad_pda_field(); \
79 #define read_pda(field) pda_from_op("mov",field)
80 #define write_pda(field,val) pda_to_op("mov",field,val)
81 #define add_pda(field,val) pda_to_op("add",field,val)
82 #define sub_pda(field,val) pda_to_op("sub",field,val)
83 #define or_pda(field,val) pda_to_op("or",field,val)
87 #define PDA_STACKOFFSET (5*8)