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 | |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 10 | /* Per processor datastructure. %gs points to it while the kernel runs */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 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 */ |
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; |
Jan Beulich | d88879b | 2008-01-30 13:31:21 +0100 | [diff] [blame] | 25 | unsigned 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[]; |
Thomas Gleixner | 40fec50 | 2008-01-30 13:30:18 +0100 | [diff] [blame] | 43 | extern void pda_init(int); |
Ravikiran G Thirumalai | df79efd | 2006-01-11 22:45:39 +0100 | [diff] [blame] | 44 | |
Ravikiran G Thirumalai | 365ba91 | 2006-01-11 22:45:42 +0100 | [diff] [blame] | 45 | #define cpu_pda(i) (_cpu_pda[i]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 47 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 50 | */ |
Andi Kleen | fd167e4 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 51 | extern void __bad_pda_field(void) __attribute__((noreturn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 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 | */ |
Andi Kleen | 53ee11a | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 57 | extern struct x8664_pda _proxy_pda; |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #define pda_offset(field) offsetof(struct x8664_pda, field) |
| 60 | |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 61 | #define pda_to_op(op, field, val) do { \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 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: \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 66 | asm(op "w %1,%%gs:%c2" : \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 67 | "+m" (_proxy_pda.field) : \ |
| 68 | "ri" ((T__)val), \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 69 | "i"(pda_offset(field))); \ |
| 70 | break; \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 71 | case 4: \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 72 | asm(op "l %1,%%gs:%c2" : \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 73 | "+m" (_proxy_pda.field) : \ |
| 74 | "ri" ((T__)val), \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 75 | "i" (pda_offset(field))); \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 76 | break; \ |
| 77 | case 8: \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 78 | asm(op "q %1,%%gs:%c2": \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 79 | "+m" (_proxy_pda.field) : \ |
| 80 | "ri" ((T__)val), \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 81 | "i"(pda_offset(field))); \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 82 | break; \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 83 | default: \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 84 | __bad_pda_field(); \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 85 | } \ |
| 86 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 88 | #define pda_from_op(op,field) ({ \ |
| 89 | typeof(_proxy_pda.field) ret__; \ |
| 90 | switch (sizeof(_proxy_pda.field)) { \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 91 | case 2: \ |
| 92 | asm(op "w %%gs:%c1,%0" : \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 93 | "=r" (ret__) : \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 94 | "i" (pda_offset(field)), \ |
| 95 | "m" (_proxy_pda.field)); \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 96 | break; \ |
| 97 | case 4: \ |
| 98 | asm(op "l %%gs:%c1,%0": \ |
| 99 | "=r" (ret__): \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 100 | "i" (pda_offset(field)), \ |
| 101 | "m" (_proxy_pda.field)); \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 102 | break; \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 103 | case 8: \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 104 | asm(op "q %%gs:%c1,%0": \ |
| 105 | "=r" (ret__) : \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 106 | "i" (pda_offset(field)), \ |
| 107 | "m" (_proxy_pda.field)); \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 108 | break; \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 109 | default: \ |
Andi Kleen | c1a9d41 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 110 | __bad_pda_field(); \ |
| 111 | } \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | ret__; }) |
| 113 | |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Andi Kleen | 9446868 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 120 | /* This is not atomic against other CPUs -- CPU preemption needs to be off */ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 121 | #define test_and_clear_bit_pda(bit, field) ({ \ |
Andi Kleen | 9446868 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 122 | int old__; \ |
| 123 | asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0" \ |
Cyrill Gorcunov | fe758fb | 2008-01-30 13:31:25 +0100 | [diff] [blame] | 124 | : "=r" (old__), "+m" (_proxy_pda.field) \ |
Andi Kleen | 9446868 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 125 | : "dIr" (bit), "i" (pda_offset(field)) : "memory"); \ |
| 126 | old__; \ |
| 127 | }) |
| 128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | #endif |
| 130 | |
| 131 | #define PDA_STACKOFFSET (5*8) |
| 132 | |
| 133 | #endif |