x86: remove never used nodenumer in pda
[sfrench/cifs-2.6.git] / include / asm-x86 / pda.h
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>
8 #include <asm/page.h>
9
10 /* Per processor datastructure. %gs points to it while the kernel runs */
11 struct x8664_pda {
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 -1 */
18         unsigned int cpunumber;         /* 36 Logical CPU number */
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;
25         unsigned int __softirq_pending;
26         unsigned int __nmi_count;       /* number of NMI on this CPUs */
27         short mmu_state;
28         short isidle;
29         struct mm_struct *active_mm;
30         unsigned apic_timer_irqs;
31         unsigned irq0_irqs;
32         unsigned irq_resched_count;
33         unsigned irq_call_count;
34         unsigned irq_tlb_count;
35         unsigned irq_thermal_count;
36         unsigned irq_threshold_count;
37         unsigned irq_spurious_count;
38 } ____cacheline_aligned_in_smp;
39
40 extern struct x8664_pda *_cpu_pda[];
41 extern struct x8664_pda boot_cpu_pda[];
42 extern void pda_init(int);
43
44 #define cpu_pda(i) (_cpu_pda[i])
45
46 /*
47  * There is no fast way to get the base address of the PDA, all the accesses
48  * have to mention %fs/%gs.  So it needs to be done this Torvaldian way.
49  */
50 extern void __bad_pda_field(void) __attribute__((noreturn));
51
52 /*
53  * proxy_pda doesn't actually exist, but tell gcc it is accessed for
54  * all PDA accesses so it gets read/write dependencies right.
55  */
56 extern struct x8664_pda _proxy_pda;
57
58 #define pda_offset(field) offsetof(struct x8664_pda, field)
59
60 #define pda_to_op(op, field, val) do {          \
61         typedef typeof(_proxy_pda.field) T__;   \
62         if (0) { T__ tmp__; tmp__ = (val); }    /* type checking */ \
63         switch (sizeof(_proxy_pda.field)) {     \
64         case 2:                                 \
65                 asm(op "w %1,%%gs:%c2" :        \
66                     "+m" (_proxy_pda.field) :   \
67                     "ri" ((T__)val),            \
68                     "i"(pda_offset(field)));    \
69                 break;                          \
70         case 4:                                 \
71                 asm(op "l %1,%%gs:%c2" :        \
72                     "+m" (_proxy_pda.field) :   \
73                     "ri" ((T__)val),            \
74                     "i" (pda_offset(field)));   \
75                 break;                          \
76         case 8:                                 \
77                 asm(op "q %1,%%gs:%c2":         \
78                     "+m" (_proxy_pda.field) :   \
79                     "ri" ((T__)val),            \
80                     "i"(pda_offset(field)));    \
81                 break;                          \
82         default:                                \
83                 __bad_pda_field();              \
84         }                                       \
85         } while (0)
86
87 #define pda_from_op(op,field) ({                \
88         typeof(_proxy_pda.field) ret__;         \
89         switch (sizeof(_proxy_pda.field)) {     \
90         case 2:                                 \
91                 asm(op "w %%gs:%c1,%0" :        \
92                     "=r" (ret__) :              \
93                     "i" (pda_offset(field)),    \
94                     "m" (_proxy_pda.field));    \
95                  break;                         \
96         case 4:                                 \
97                 asm(op "l %%gs:%c1,%0":         \
98                     "=r" (ret__):               \
99                     "i" (pda_offset(field)),    \
100                     "m" (_proxy_pda.field));    \
101                  break;                         \
102         case 8:                                 \
103                 asm(op "q %%gs:%c1,%0":         \
104                     "=r" (ret__) :              \
105                     "i" (pda_offset(field)),    \
106                     "m" (_proxy_pda.field));    \
107                  break;                         \
108         default:                                \
109                 __bad_pda_field();              \
110        }                                        \
111        ret__; })
112
113 #define read_pda(field)         pda_from_op("mov", field)
114 #define write_pda(field, val)   pda_to_op("mov", field, val)
115 #define add_pda(field, val)     pda_to_op("add", field, val)
116 #define sub_pda(field, val)     pda_to_op("sub", field, val)
117 #define or_pda(field, val)      pda_to_op("or", field, val)
118
119 /* This is not atomic against other CPUs -- CPU preemption needs to be off */
120 #define test_and_clear_bit_pda(bit, field) ({           \
121         int old__;                                              \
122         asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0"            \
123             : "=r" (old__), "+m" (_proxy_pda.field)             \
124             : "dIr" (bit), "i" (pda_offset(field)) : "memory"); \
125         old__;                                                  \
126 })
127
128 #endif
129
130 #define PDA_STACKOFFSET (5*8)
131
132 #endif