1 files changed, 126 insertions, 0 deletions
diff --git a/include/asm-x86/pda.h b/include/asm-x86/pda.h
new file mode 100644
index 000000000000..fb49f80eb94f
--- /dev/null
+++ b/include/asm-x86/pda.h
@@ -0,0 +1,126 @@
+#ifndef X86_64_PDA_H
+#define X86_64_PDA_H
+#ifndef __ASSEMBLY__
+#include <linux/stddef.h>
+#include <linux/types.h>
+#include <linux/cache.h>
+#include <asm/page.h>
+/* Per processor datastructure. %gs points to it while the kernel runs */ 
+struct x8664_pda {
+        struct task_struct *pcurrent;   /* 0  Current process */
+        unsigned long data_offset;      /* 8 Per cpu data offset from linker
+                                           address */
+        unsigned long kernelstack;  /* 16 top of kernel stack for current */
+        unsigned long oldrsp;       /* 24 user rsp for system call */
+        int irqcount;               /* 32 Irq nesting counter. Starts with -1 */
+        int cpunumber;              /* 36 Logical CPU number */
+#ifdef CONFIG_CC_STACKPROTECTOR
+        unsigned long stack_canary;     /* 40 stack canary value */
+                                        /* gcc-ABI: this canary MUST be at
+                                           offset 40!!! */
+#endif
+        char *irqstackptr;
+        int nodenumber;             /* number of current node */
+        unsigned int __softirq_pending;
+        unsigned int __nmi_count;       /* number of NMI on this CPUs */
+        short mmu_state;
+        short isidle;
+        struct mm_struct *active_mm;
+        unsigned apic_timer_irqs;
+        unsigned irq0_irqs;
+} ____cacheline_aligned_in_smp;
+extern struct x8664_pda *_cpu_pda[];
+extern struct x8664_pda boot_cpu_pda[];
+#define cpu_pda(i) (_cpu_pda[i])
+/* 
+ * There is no fast way to get the base address of the PDA, all the accesses
+ * have to mention %fs/%gs.  So it needs to be done this Torvaldian way.
+ */ 
+extern void __bad_pda_field(void) __attribute__((noreturn));
+/*
+ * proxy_pda doesn't actually exist, but tell gcc it is accessed for
+ * all PDA accesses so it gets read/write dependencies right.
+ */
+extern struct x8664_pda _proxy_pda;
+#define pda_offset(field) offsetof(struct x8664_pda, field)
+#define pda_to_op(op,field,val) do {            \
+        typedef typeof(_proxy_pda.field) T__;   \
+        if (0) { T__ tmp__; tmp__ = (val); }    /* type checking */ \
+        switch (sizeof(_proxy_pda.field)) {     \
+        case 2:                                 \
+                asm(op "w %1,%%gs:%c2" :        \
+                    "+m" (_proxy_pda.field) :   \
+                    "ri" ((T__)val),            \
+                    "i"(pda_offset(field)));    \
+                break;                          \
+        case 4:                                 \
+                asm(op "l %1,%%gs:%c2" :        \
+                    "+m" (_proxy_pda.field) :   \
+                    "ri" ((T__)val),            \
+                    "i" (pda_offset(field)));   \
+                break;                          \
+        case 8:                                 \
+                asm(op "q %1,%%gs:%c2":         \
+                    "+m" (_proxy_pda.field) :   \
+                    "ri" ((T__)val),            \
+                    "i"(pda_offset(field)));    \
+                break;                          \
+       default:                                 \
+                __bad_pda_field();              \
+       }                                        \
+       } while (0)
+#define pda_from_op(op,field) ({                \
+        typeof(_proxy_pda.field) ret__;         \
+        switch (sizeof(_proxy_pda.field)) {     \
+        case 2:                                 \
+                asm(op "w %%gs:%c1,%0" :        \
+                    "=r" (ret__) :              \
+                    "i" (pda_offset(field)),    \
+                    "m" (_proxy_pda.field));    \
+                 break;                         \
+        case 4:                                 \
+                asm(op "l %%gs:%c1,%0":         \
+                    "=r" (ret__):               \
+                    "i" (pda_offset(field)),    \
+                    "m" (_proxy_pda.field));    \
+                 break;                         \
+       case 8:                                  \
+                asm(op "q %%gs:%c1,%0":         \
+                    "=r" (ret__) :              \
+                    "i" (pda_offset(field)),    \
+                    "m" (_proxy_pda.field));    \
+                 break;                         \
+       default:                                 \
+                __bad_pda_field();              \
+       }                                        \
+       ret__; })
+#define read_pda(field) pda_from_op("mov",field)
+#define write_pda(field,val) pda_to_op("mov",field,val)
+#define add_pda(field,val) pda_to_op("add",field,val)
+#define sub_pda(field,val) pda_to_op("sub",field,val)
+#define or_pda(field,val) pda_to_op("or",field,val)
+/* This is not atomic against other CPUs -- CPU preemption needs to be off */
+#define test_and_clear_bit_pda(bit,field) ({            \
+        int old__;                                              \
+        asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0"            \
+            : "=r" (old__), "+m" (_proxy_pda.field)             \
+            : "dIr" (bit), "i" (pda_offset(field)) : "memory"); \
+        old__;                                                  \
+})
+#endif
+#define PDA_STACKOFFSET (5*8)
+#endif

diff --git a/include/asm-x86/pda.h b/include/asm-x86/pda.h new file mode 100644 index 000000000000..fb49f80eb94f --- /dev/null +++ b/include/asm-x86/pda.h
@@ -0,0 +1,126 @@
	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 with -1 */
	18	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	int nodenumber; /* number of current node */
	26	unsigned int __softirq_pending;
	27	unsigned int __nmi_count; /* number of NMI on this CPUs */
	28	short mmu_state;
	29	short isidle;
	30	struct mm_struct *active_mm;
	31	unsigned apic_timer_irqs;
	32	unsigned irq0_irqs;
	33	} ____cacheline_aligned_in_smp;
	34
	35	extern struct x8664_pda *_cpu_pda[];
	36	extern struct x8664_pda boot_cpu_pda[];
	37
	38	#define cpu_pda(i) (_cpu_pda[i])
	39
	40	/*
	41	* There is no fast way to get the base address of the PDA, all the accesses
	42	* have to mention %fs/%gs. So it needs to be done this Torvaldian way.
	43	*/
	44	extern void __bad_pda_field(void) __attribute__((noreturn));
	45
	46	/*
	47	* proxy_pda doesn't actually exist, but tell gcc it is accessed for
	48	* all PDA accesses so it gets read/write dependencies right.
	49	*/
	50	extern struct x8664_pda _proxy_pda;
	51
	52	#define pda_offset(field) offsetof(struct x8664_pda, field)
	53
	54	#define pda_to_op(op,field,val) do { \
	55	typedef typeof(_proxy_pda.field) T__; \
	56	if (0) { T__ tmp__; tmp__ = (val); } /* type checking */ \
	57	switch (sizeof(_proxy_pda.field)) { \
	58	case 2: \
	59	asm(op "w %1,%%gs:%c2" : \
	60	"+m" (_proxy_pda.field) : \
	61	"ri" ((T__)val), \
	62	"i"(pda_offset(field))); \
	63	break; \
	64	case 4: \
	65	asm(op "l %1,%%gs:%c2" : \
	66	"+m" (_proxy_pda.field) : \
	67	"ri" ((T__)val), \
	68	"i" (pda_offset(field))); \
	69	break; \
	70	case 8: \
	71	asm(op "q %1,%%gs:%c2": \
	72	"+m" (_proxy_pda.field) : \
	73	"ri" ((T__)val), \
	74	"i"(pda_offset(field))); \
	75	break; \
	76	default: \
	77	__bad_pda_field(); \
	78	} \
	79	} while (0)
	80
	81	#define pda_from_op(op,field) ({ \
	82	typeof(_proxy_pda.field) ret__; \
	83	switch (sizeof(_proxy_pda.field)) { \
	84	case 2: \
	85	asm(op "w %%gs:%c1,%0" : \
	86	"=r" (ret__) : \
	87	"i" (pda_offset(field)), \
	88	"m" (_proxy_pda.field)); \
	89	break; \
	90	case 4: \
	91	asm(op "l %%gs:%c1,%0": \
	92	"=r" (ret__): \
	93	"i" (pda_offset(field)), \
	94	"m" (_proxy_pda.field)); \
	95	break; \
	96	case 8: \
	97	asm(op "q %%gs:%c1,%0": \
	98	"=r" (ret__) : \
	99	"i" (pda_offset(field)), \
	100	"m" (_proxy_pda.field)); \
	101	break; \
	102	default: \
	103	__bad_pda_field(); \
	104	} \
	105	ret__; })
	106
	107	#define read_pda(field) pda_from_op("mov",field)
	108	#define write_pda(field,val) pda_to_op("mov",field,val)
	109	#define add_pda(field,val) pda_to_op("add",field,val)
	110	#define sub_pda(field,val) pda_to_op("sub",field,val)
	111	#define or_pda(field,val) pda_to_op("or",field,val)
	112
	113	/* This is not atomic against other CPUs -- CPU preemption needs to be off */
	114	#define test_and_clear_bit_pda(bit,field) ({ \
	115	int old__; \
	116	asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0" \
	117	: "=r" (old__), "+m" (_proxy_pda.field) \
	118	: "dIr" (bit), "i" (pda_offset(field)) : "memory"); \
	119	old__; \
	120	})
	121
	122	#endif
	123
	124	#define PDA_STACKOFFSET (5*8)
	125
	126	#endif