Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Jan Beulich | b556b35 | 2006-01-11 22:43:00 +0100 | [diff] [blame] | 8 | #include <asm/page.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | |
| 10 | /* Per processor datastructure. %gs points to it while the kernel runs */ |
| 11 | struct x8664_pda { |
Arjan van de Ven | 29a9af6 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 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 */ |
Arjan van de Ven | 0a42540 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 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; |
Andi Kleen | 69d81fc | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 25 | int nodenumber; /* number of current node */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | unsigned int __softirq_pending; |
| 27 | unsigned int __nmi_count; /* number of NMI on this CPUs */ |
Andi Kleen | a15da49 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 28 | short mmu_state; |
| 29 | short isidle; |
Arjan van de Ven | df92004 | 2006-03-25 16:31:01 +0100 | [diff] [blame] | 30 | struct mm_struct *active_mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | unsigned apic_timer_irqs; |
Thomas Gleixner | 4e77ae3 | 2007-10-12 23:04:07 +0200 | [diff] [blame] | 32 | unsigned irq0_irqs; |
Joe Korty | 38e760a | 2007-10-17 18:04:40 +0200 | [diff] [blame] | 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; |
Andi Kleen | b916911 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 39 | } ____cacheline_aligned_in_smp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Ravikiran G Thirumalai | 365ba91 | 2006-01-11 22:45:42 +0100 | [diff] [blame] | 41 | extern struct x8664_pda *_cpu_pda[]; |
| 42 | extern struct x8664_pda boot_cpu_pda[]; |
Ravikiran G Thirumalai | df79efd | 2006-01-11 22:45:39 +0100 | [diff] [blame] | 43 | |
Ravikiran G Thirumalai | 365ba91 | 2006-01-11 22:45:42 +0100 | [diff] [blame] | 44 | #define cpu_pda(i) (_cpu_pda[i]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Andi Kleen | fd167e4 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 50 | extern void __bad_pda_field(void) __attribute__((noreturn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 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 | */ |
Andi Kleen | 53ee11a | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 56 | extern struct x8664_pda _proxy_pda; |
| 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #define pda_offset(field) offsetof(struct x8664_pda, field) |
| 59 | |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 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 | } \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } while (0) |
| 86 | |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 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 | } \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | ret__; }) |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
Andi Kleen | 3f74478 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 117 | #define or_pda(field,val) pda_to_op("or",field,val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Andi Kleen | 9446868 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | #endif |
| 129 | |
| 130 | #define PDA_STACKOFFSET (5*8) |
| 131 | |
| 132 | #endif |