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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 */ | |
0a425405 AV |
19 | #ifdef CONFIG_CC_STACKPROTECTOR |
20 | unsigned long stack_canary; /* 40 stack canary value */ | |
21 | /* gcc-ABI: this canary MUST be at | |
22 | offset 40!!! */ | |
23 | #endif | |
24 | char *irqstackptr; | |
69d81fcd | 25 | int nodenumber; /* number of current node */ |
1da177e4 LT |
26 | unsigned int __softirq_pending; |
27 | unsigned int __nmi_count; /* number of NMI on this CPUs */ | |
1da177e4 | 28 | int mmu_state; |
df92004c | 29 | struct mm_struct *active_mm; |
1da177e4 | 30 | unsigned apic_timer_irqs; |
b9169116 | 31 | } ____cacheline_aligned_in_smp; |
1da177e4 | 32 | |
365ba917 RT |
33 | extern struct x8664_pda *_cpu_pda[]; |
34 | extern struct x8664_pda boot_cpu_pda[]; | |
df79efde | 35 | |
365ba917 | 36 | #define cpu_pda(i) (_cpu_pda[i]) |
1da177e4 LT |
37 | |
38 | /* | |
39 | * There is no fast way to get the base address of the PDA, all the accesses | |
40 | * have to mention %fs/%gs. So it needs to be done this Torvaldian way. | |
41 | */ | |
fd167e42 | 42 | extern void __bad_pda_field(void) __attribute__((noreturn)); |
1da177e4 | 43 | |
c1a9d41f AK |
44 | /* |
45 | * proxy_pda doesn't actually exist, but tell gcc it is accessed for | |
46 | * all PDA accesses so it gets read/write dependencies right. | |
47 | */ | |
53ee11ae AK |
48 | extern struct x8664_pda _proxy_pda; |
49 | ||
1da177e4 LT |
50 | #define pda_offset(field) offsetof(struct x8664_pda, field) |
51 | ||
c1a9d41f AK |
52 | #define pda_to_op(op,field,val) do { \ |
53 | typedef typeof(_proxy_pda.field) T__; \ | |
54 | if (0) { T__ tmp__; tmp__ = (val); } /* type checking */ \ | |
55 | switch (sizeof(_proxy_pda.field)) { \ | |
56 | case 2: \ | |
57 | asm(op "w %1,%%gs:%c2" : \ | |
58 | "+m" (_proxy_pda.field) : \ | |
59 | "ri" ((T__)val), \ | |
60 | "i"(pda_offset(field))); \ | |
61 | break; \ | |
62 | case 4: \ | |
63 | asm(op "l %1,%%gs:%c2" : \ | |
64 | "+m" (_proxy_pda.field) : \ | |
65 | "ri" ((T__)val), \ | |
66 | "i" (pda_offset(field))); \ | |
67 | break; \ | |
68 | case 8: \ | |
69 | asm(op "q %1,%%gs:%c2": \ | |
70 | "+m" (_proxy_pda.field) : \ | |
71 | "ri" ((T__)val), \ | |
72 | "i"(pda_offset(field))); \ | |
73 | break; \ | |
74 | default: \ | |
75 | __bad_pda_field(); \ | |
76 | } \ | |
1da177e4 LT |
77 | } while (0) |
78 | ||
c1a9d41f AK |
79 | #define pda_from_op(op,field) ({ \ |
80 | typeof(_proxy_pda.field) ret__; \ | |
81 | switch (sizeof(_proxy_pda.field)) { \ | |
82 | case 2: \ | |
83 | asm(op "w %%gs:%c1,%0" : \ | |
84 | "=r" (ret__) : \ | |
85 | "i" (pda_offset(field)), \ | |
86 | "m" (_proxy_pda.field)); \ | |
87 | break; \ | |
88 | case 4: \ | |
89 | asm(op "l %%gs:%c1,%0": \ | |
90 | "=r" (ret__): \ | |
91 | "i" (pda_offset(field)), \ | |
92 | "m" (_proxy_pda.field)); \ | |
93 | break; \ | |
94 | case 8: \ | |
95 | asm(op "q %%gs:%c1,%0": \ | |
96 | "=r" (ret__) : \ | |
97 | "i" (pda_offset(field)), \ | |
98 | "m" (_proxy_pda.field)); \ | |
99 | break; \ | |
100 | default: \ | |
101 | __bad_pda_field(); \ | |
102 | } \ | |
1da177e4 LT |
103 | ret__; }) |
104 | ||
1da177e4 LT |
105 | #define read_pda(field) pda_from_op("mov",field) |
106 | #define write_pda(field,val) pda_to_op("mov",field,val) | |
107 | #define add_pda(field,val) pda_to_op("add",field,val) | |
108 | #define sub_pda(field,val) pda_to_op("sub",field,val) | |
3f74478b | 109 | #define or_pda(field,val) pda_to_op("or",field,val) |
1da177e4 LT |
110 | |
111 | #endif | |
112 | ||
113 | #define PDA_STACKOFFSET (5*8) | |
114 | ||
115 | #endif |