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1da177e4 LT |
1 | #ifndef X86_64_PDA_H |
2 | #define X86_64_PDA_H | |
3 | ||
4 | #ifndef __ASSEMBLY__ | |
5 | #include <linux/stddef.h> | |
6 | #include <linux/types.h> | |
7 | #include <linux/cache.h> | |
b556b35e | 8 | #include <asm/page.h> |
1da177e4 LT |
9 | |
10 | /* Per processor datastructure. %gs points to it while the kernel runs */ | |
11 | struct x8664_pda { | |
12 | struct task_struct *pcurrent; /* Current process */ | |
13 | unsigned long data_offset; /* Per cpu data offset from linker address */ | |
1da177e4 LT |
14 | unsigned long kernelstack; /* top of kernel stack for current */ |
15 | unsigned long oldrsp; /* user rsp for system call */ | |
b556b35e JB |
16 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
17 | unsigned long debugstack; /* #DB/#BP stack. */ | |
18 | #endif | |
1da177e4 LT |
19 | int irqcount; /* Irq nesting counter. Starts with -1 */ |
20 | int cpunumber; /* Logical CPU number */ | |
21 | char *irqstackptr; /* top of irqstack */ | |
69d81fcd | 22 | int nodenumber; /* number of current node */ |
1da177e4 LT |
23 | unsigned int __softirq_pending; |
24 | unsigned int __nmi_count; /* number of NMI on this CPUs */ | |
25 | struct mm_struct *active_mm; | |
26 | int mmu_state; | |
27 | unsigned apic_timer_irqs; | |
b9169116 | 28 | } ____cacheline_aligned_in_smp; |
1da177e4 | 29 | |
df79efde RT |
30 | extern struct x8664_pda _cpu_pda[]; |
31 | ||
32 | #define cpu_pda(i) (&_cpu_pda[i]) | |
1da177e4 LT |
33 | |
34 | /* | |
35 | * There is no fast way to get the base address of the PDA, all the accesses | |
36 | * have to mention %fs/%gs. So it needs to be done this Torvaldian way. | |
37 | */ | |
38 | #define sizeof_field(type,field) (sizeof(((type *)0)->field)) | |
39 | #define typeof_field(type,field) typeof(((type *)0)->field) | |
40 | ||
41 | extern void __bad_pda_field(void); | |
42 | ||
43 | #define pda_offset(field) offsetof(struct x8664_pda, field) | |
44 | ||
45 | #define pda_to_op(op,field,val) do { \ | |
3f74478b | 46 | typedef typeof_field(struct x8664_pda, field) T__; \ |
1da177e4 LT |
47 | switch (sizeof_field(struct x8664_pda, field)) { \ |
48 | case 2: \ | |
3f74478b | 49 | asm volatile(op "w %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \ |
1da177e4 | 50 | case 4: \ |
3f74478b | 51 | asm volatile(op "l %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \ |
1da177e4 | 52 | case 8: \ |
3f74478b | 53 | asm volatile(op "q %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \ |
1da177e4 LT |
54 | default: __bad_pda_field(); \ |
55 | } \ | |
56 | } while (0) | |
57 | ||
58 | /* | |
59 | * AK: PDA read accesses should be neither volatile nor have an memory clobber. | |
60 | * Unfortunately removing them causes all hell to break lose currently. | |
61 | */ | |
62 | #define pda_from_op(op,field) ({ \ | |
3f74478b | 63 | typeof_field(struct x8664_pda, field) ret__; \ |
1da177e4 LT |
64 | switch (sizeof_field(struct x8664_pda, field)) { \ |
65 | case 2: \ | |
66 | asm volatile(op "w %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\ | |
67 | case 4: \ | |
68 | asm volatile(op "l %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\ | |
69 | case 8: \ | |
70 | asm volatile(op "q %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\ | |
71 | default: __bad_pda_field(); \ | |
72 | } \ | |
73 | ret__; }) | |
74 | ||
75 | ||
76 | #define read_pda(field) pda_from_op("mov",field) | |
77 | #define write_pda(field,val) pda_to_op("mov",field,val) | |
78 | #define add_pda(field,val) pda_to_op("add",field,val) | |
79 | #define sub_pda(field,val) pda_to_op("sub",field,val) | |
3f74478b | 80 | #define or_pda(field,val) pda_to_op("or",field,val) |
1da177e4 LT |
81 | |
82 | #endif | |
83 | ||
84 | #define PDA_STACKOFFSET (5*8) | |
85 | ||
86 | #endif |