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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 | 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; | |
d88879b2 | 25 | unsigned int nodenumber; /* number of current node */ |
1da177e4 LT |
26 | unsigned int __softirq_pending; |
27 | unsigned int __nmi_count; /* number of NMI on this CPUs */ | |
a15da49d AK |
28 | short mmu_state; |
29 | short isidle; | |
df92004c | 30 | struct mm_struct *active_mm; |
1da177e4 | 31 | unsigned apic_timer_irqs; |
4e77ae3e | 32 | unsigned irq0_irqs; |
38e760a1 JK |
33 | unsigned irq_resched_count; |
34 | unsigned irq_call_count; | |
35 | unsigned irq_tlb_count; | |
36 | unsigned irq_thermal_count; | |
37 | unsigned irq_threshold_count; | |
38 | unsigned irq_spurious_count; | |
b9169116 | 39 | } ____cacheline_aligned_in_smp; |
1da177e4 | 40 | |
365ba917 RT |
41 | extern struct x8664_pda *_cpu_pda[]; |
42 | extern struct x8664_pda boot_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 | ||
fe758fb1 | 61 | #define pda_to_op(op, field, val) do { \ |
c1a9d41f AK |
62 | typedef typeof(_proxy_pda.field) T__; \ |
63 | if (0) { T__ tmp__; tmp__ = (val); } /* type checking */ \ | |
64 | switch (sizeof(_proxy_pda.field)) { \ | |
65 | case 2: \ | |
fe758fb1 | 66 | asm(op "w %1,%%gs:%c2" : \ |
c1a9d41f AK |
67 | "+m" (_proxy_pda.field) : \ |
68 | "ri" ((T__)val), \ | |
fe758fb1 CG |
69 | "i"(pda_offset(field))); \ |
70 | break; \ | |
c1a9d41f | 71 | case 4: \ |
fe758fb1 | 72 | asm(op "l %1,%%gs:%c2" : \ |
c1a9d41f AK |
73 | "+m" (_proxy_pda.field) : \ |
74 | "ri" ((T__)val), \ | |
fe758fb1 | 75 | "i" (pda_offset(field))); \ |
c1a9d41f AK |
76 | break; \ |
77 | case 8: \ | |
fe758fb1 | 78 | asm(op "q %1,%%gs:%c2": \ |
c1a9d41f AK |
79 | "+m" (_proxy_pda.field) : \ |
80 | "ri" ((T__)val), \ | |
fe758fb1 | 81 | "i"(pda_offset(field))); \ |
c1a9d41f | 82 | break; \ |
fe758fb1 | 83 | default: \ |
c1a9d41f | 84 | __bad_pda_field(); \ |
fe758fb1 CG |
85 | } \ |
86 | } while (0) | |
1da177e4 | 87 | |
c1a9d41f AK |
88 | #define pda_from_op(op,field) ({ \ |
89 | typeof(_proxy_pda.field) ret__; \ | |
90 | switch (sizeof(_proxy_pda.field)) { \ | |
fe758fb1 CG |
91 | case 2: \ |
92 | asm(op "w %%gs:%c1,%0" : \ | |
c1a9d41f | 93 | "=r" (ret__) : \ |
fe758fb1 CG |
94 | "i" (pda_offset(field)), \ |
95 | "m" (_proxy_pda.field)); \ | |
c1a9d41f AK |
96 | break; \ |
97 | case 4: \ | |
98 | asm(op "l %%gs:%c1,%0": \ | |
99 | "=r" (ret__): \ | |
fe758fb1 CG |
100 | "i" (pda_offset(field)), \ |
101 | "m" (_proxy_pda.field)); \ | |
c1a9d41f | 102 | break; \ |
fe758fb1 | 103 | case 8: \ |
c1a9d41f AK |
104 | asm(op "q %%gs:%c1,%0": \ |
105 | "=r" (ret__) : \ | |
fe758fb1 CG |
106 | "i" (pda_offset(field)), \ |
107 | "m" (_proxy_pda.field)); \ | |
c1a9d41f | 108 | break; \ |
fe758fb1 | 109 | default: \ |
c1a9d41f AK |
110 | __bad_pda_field(); \ |
111 | } \ | |
1da177e4 LT |
112 | ret__; }) |
113 | ||
fe758fb1 CG |
114 | #define read_pda(field) pda_from_op("mov", field) |
115 | #define write_pda(field, val) pda_to_op("mov", field, val) | |
116 | #define add_pda(field, val) pda_to_op("add", field, val) | |
117 | #define sub_pda(field, val) pda_to_op("sub", field, val) | |
118 | #define or_pda(field, val) pda_to_op("or", field, val) | |
1da177e4 | 119 | |
9446868b | 120 | /* This is not atomic against other CPUs -- CPU preemption needs to be off */ |
fe758fb1 | 121 | #define test_and_clear_bit_pda(bit, field) ({ \ |
9446868b AK |
122 | int old__; \ |
123 | asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0" \ | |
fe758fb1 | 124 | : "=r" (old__), "+m" (_proxy_pda.field) \ |
9446868b AK |
125 | : "dIr" (bit), "i" (pda_offset(field)) : "memory"); \ |
126 | old__; \ | |
127 | }) | |
128 | ||
1da177e4 LT |
129 | #endif |
130 | ||
131 | #define PDA_STACKOFFSET (5*8) | |
132 | ||
133 | #endif |