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77ef50a5 VN |
1 | #ifndef ASM_X86__PDA_H |
2 | #define ASM_X86__PDA_H | |
1da177e4 LT |
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 | 9 | |
fe758fb1 | 10 | /* Per processor datastructure. %gs points to it while the kernel runs */ |
1da177e4 | 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 */ | |
fe758fb1 CG |
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 -1 */ | |
18 | unsigned 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; | |
3461b0af MT |
25 | short nodenumber; /* number of current node (32k max) */ |
26 | short in_bootmem; /* pda lives in bootmem */ | |
1da177e4 LT |
27 | unsigned int __softirq_pending; |
28 | unsigned int __nmi_count; /* number of NMI on this CPUs */ | |
a15da49d AK |
29 | short mmu_state; |
30 | short isidle; | |
df92004c | 31 | struct mm_struct *active_mm; |
1da177e4 | 32 | unsigned apic_timer_irqs; |
4e77ae3e | 33 | unsigned irq0_irqs; |
38e760a1 JK |
34 | unsigned irq_resched_count; |
35 | unsigned irq_call_count; | |
36 | unsigned irq_tlb_count; | |
37 | unsigned irq_thermal_count; | |
38 | unsigned irq_threshold_count; | |
39 | unsigned irq_spurious_count; | |
b9169116 | 40 | } ____cacheline_aligned_in_smp; |
1da177e4 | 41 | |
3461b0af | 42 | extern struct x8664_pda **_cpu_pda; |
40fec50a | 43 | extern void pda_init(int); |
df79efde | 44 | |
365ba917 | 45 | #define cpu_pda(i) (_cpu_pda[i]) |
1da177e4 | 46 | |
fe758fb1 | 47 | /* |
1da177e4 LT |
48 | * There is no fast way to get the base address of the PDA, all the accesses |
49 | * have to mention %fs/%gs. So it needs to be done this Torvaldian way. | |
fe758fb1 | 50 | */ |
fd167e42 | 51 | extern void __bad_pda_field(void) __attribute__((noreturn)); |
1da177e4 | 52 | |
c1a9d41f AK |
53 | /* |
54 | * proxy_pda doesn't actually exist, but tell gcc it is accessed for | |
55 | * all PDA accesses so it gets read/write dependencies right. | |
56 | */ | |
53ee11ae AK |
57 | extern struct x8664_pda _proxy_pda; |
58 | ||
1da177e4 LT |
59 | #define pda_offset(field) offsetof(struct x8664_pda, field) |
60 | ||
46e1abc6 JP |
61 | #define pda_to_op(op, field, val) \ |
62 | do { \ | |
63 | typedef typeof(_proxy_pda.field) T__; \ | |
64 | if (0) { T__ tmp__; tmp__ = (val); } /* type checking */ \ | |
65 | switch (sizeof(_proxy_pda.field)) { \ | |
66 | case 2: \ | |
67 | asm(op "w %1,%%gs:%c2" : \ | |
68 | "+m" (_proxy_pda.field) : \ | |
69 | "ri" ((T__)val), \ | |
70 | "i"(pda_offset(field))); \ | |
71 | break; \ | |
72 | case 4: \ | |
73 | asm(op "l %1,%%gs:%c2" : \ | |
74 | "+m" (_proxy_pda.field) : \ | |
75 | "ri" ((T__)val), \ | |
76 | "i" (pda_offset(field))); \ | |
77 | break; \ | |
78 | case 8: \ | |
79 | asm(op "q %1,%%gs:%c2": \ | |
80 | "+m" (_proxy_pda.field) : \ | |
81 | "ri" ((T__)val), \ | |
82 | "i"(pda_offset(field))); \ | |
83 | break; \ | |
84 | default: \ | |
85 | __bad_pda_field(); \ | |
86 | } \ | |
87 | } while (0) | |
1da177e4 | 88 | |
46e1abc6 JP |
89 | #define pda_from_op(op, field) \ |
90 | ({ \ | |
c1a9d41f AK |
91 | typeof(_proxy_pda.field) ret__; \ |
92 | switch (sizeof(_proxy_pda.field)) { \ | |
fe758fb1 CG |
93 | case 2: \ |
94 | asm(op "w %%gs:%c1,%0" : \ | |
c1a9d41f | 95 | "=r" (ret__) : \ |
fe758fb1 CG |
96 | "i" (pda_offset(field)), \ |
97 | "m" (_proxy_pda.field)); \ | |
46e1abc6 | 98 | break; \ |
c1a9d41f AK |
99 | case 4: \ |
100 | asm(op "l %%gs:%c1,%0": \ | |
101 | "=r" (ret__): \ | |
fe758fb1 CG |
102 | "i" (pda_offset(field)), \ |
103 | "m" (_proxy_pda.field)); \ | |
46e1abc6 | 104 | break; \ |
fe758fb1 | 105 | case 8: \ |
c1a9d41f AK |
106 | asm(op "q %%gs:%c1,%0": \ |
107 | "=r" (ret__) : \ | |
fe758fb1 CG |
108 | "i" (pda_offset(field)), \ |
109 | "m" (_proxy_pda.field)); \ | |
46e1abc6 | 110 | break; \ |
fe758fb1 | 111 | default: \ |
c1a9d41f | 112 | __bad_pda_field(); \ |
46e1abc6 JP |
113 | } \ |
114 | ret__; \ | |
115 | }) | |
1da177e4 | 116 | |
fe758fb1 CG |
117 | #define read_pda(field) pda_from_op("mov", field) |
118 | #define write_pda(field, val) pda_to_op("mov", field, val) | |
119 | #define add_pda(field, val) pda_to_op("add", field, val) | |
120 | #define sub_pda(field, val) pda_to_op("sub", field, val) | |
121 | #define or_pda(field, val) pda_to_op("or", field, val) | |
1da177e4 | 122 | |
9446868b | 123 | /* This is not atomic against other CPUs -- CPU preemption needs to be off */ |
46e1abc6 JP |
124 | #define test_and_clear_bit_pda(bit, field) \ |
125 | ({ \ | |
126 | int old__; \ | |
127 | asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0" \ | |
128 | : "=r" (old__), "+m" (_proxy_pda.field) \ | |
129 | : "dIr" (bit), "i" (pda_offset(field)) : "memory");\ | |
130 | old__; \ | |
9446868b AK |
131 | }) |
132 | ||
1da177e4 LT |
133 | #endif |
134 | ||
135 | #define PDA_STACKOFFSET (5*8) | |
136 | ||
77ef50a5 | 137 | #endif /* ASM_X86__PDA_H */ |