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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 { | |
29a9af60 AV |
12 | struct task_struct *pcurrent; /* 0 Current process */ |
13 | unsigned long data_offset; /* 8 Per cpu data offset from linker | |
14 | address */ | |
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 */ | |
69d81fcd | 20 | int nodenumber; /* number of current node */ |
1da177e4 LT |
21 | unsigned int __softirq_pending; |
22 | unsigned int __nmi_count; /* number of NMI on this CPUs */ | |
1da177e4 | 23 | int mmu_state; |
df92004c | 24 | struct mm_struct *active_mm; |
1da177e4 | 25 | unsigned apic_timer_irqs; |
b9169116 | 26 | } ____cacheline_aligned_in_smp; |
1da177e4 | 27 | |
365ba917 RT |
28 | extern struct x8664_pda *_cpu_pda[]; |
29 | extern struct x8664_pda boot_cpu_pda[]; | |
df79efde | 30 | |
365ba917 | 31 | #define cpu_pda(i) (_cpu_pda[i]) |
1da177e4 LT |
32 | |
33 | /* | |
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. | |
36 | */ | |
1da177e4 LT |
37 | extern void __bad_pda_field(void); |
38 | ||
53ee11ae AK |
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; | |
42 | ||
1da177e4 LT |
43 | #define pda_offset(field) offsetof(struct x8664_pda, field) |
44 | ||
45 | #define pda_to_op(op,field,val) do { \ | |
53ee11ae AK |
46 | typedef typeof(_proxy_pda.field) T__; \ |
47 | switch (sizeof(_proxy_pda.field)) { \ | |
1da177e4 | 48 | case 2: \ |
53ee11ae AK |
49 | asm(op "w %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \ |
50 | "ri" ((T__)val),"i"(pda_offset(field))); break; \ | |
1da177e4 | 51 | case 4: \ |
53ee11ae AK |
52 | asm(op "l %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \ |
53 | "ri" ((T__)val),"i"(pda_offset(field))); break; \ | |
1da177e4 | 54 | case 8: \ |
53ee11ae AK |
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(); \ | |
1da177e4 LT |
58 | } \ |
59 | } while (0) | |
60 | ||
1da177e4 | 61 | #define pda_from_op(op,field) ({ \ |
53ee11ae AK |
62 | typeof(_proxy_pda.field) ret__; \ |
63 | switch (sizeof(_proxy_pda.field)) { \ | |
1da177e4 | 64 | case 2: \ |
53ee11ae AK |
65 | asm(op "w %%gs:%P1,%0":"=r" (ret__):\ |
66 | "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\ | |
1da177e4 | 67 | case 4: \ |
53ee11ae AK |
68 | asm(op "l %%gs:%P1,%0":"=r" (ret__):\ |
69 | "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\ | |
1da177e4 | 70 | case 8: \ |
53ee11ae AK |
71 | asm(op "q %%gs:%P1,%0":"=r" (ret__):\ |
72 | "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\ | |
73 | default: __bad_pda_field(); \ | |
1da177e4 LT |
74 | } \ |
75 | ret__; }) | |
76 | ||
77 | ||
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) | |
3f74478b | 82 | #define or_pda(field,val) pda_to_op("or",field,val) |
1da177e4 LT |
83 | |
84 | #endif | |
85 | ||
86 | #define PDA_STACKOFFSET (5*8) | |
87 | ||
88 | #endif |