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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-x86_64/] [pda.h] - Rev 1774
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#ifndef X86_64_PDA_H #define X86_64_PDA_H #include <linux/cache.h> /* Per processor datastructure. %gs points to it while the kernel runs */ /* To use a new field with the *_pda macros it needs to be added to tools/offset.c */ struct x8664_pda { unsigned long kernelstack; /* TOS for current process */ unsigned long oldrsp; /* user rsp for system call */ unsigned long irqrsp; /* Old rsp for interrupts. */ struct task_struct *pcurrent; /* Current process */ int irqcount; /* Irq nesting counter. Starts with -1 */ int cpunumber; /* Logical CPU number */ /* XXX: could be a single list */ unsigned long *pgd_quick; unsigned long *pmd_quick; unsigned long *pte_quick; unsigned long pgtable_cache_sz; char *irqstackptr; /* top of irqstack */ unsigned long volatile *level4_pgt; } ____cacheline_aligned; #define PDA_STACKOFFSET (5*8) #define IRQSTACK_ORDER 2 #define IRQSTACKSIZE (PAGE_SIZE << IRQSTACK_ORDER) extern struct x8664_pda cpu_pda[]; /* * 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. */ #define sizeof_field(type,field) (sizeof(((type *)0)->field)) #define typeof_field(type,field) typeof(((type *)0)->field) extern void __bad_pda_field(void); /* Don't use offsetof because it requires too much infrastructure */ #define pda_offset(field) ((unsigned long)&((struct x8664_pda *)0)->field) #define pda_to_op(op,field,val) do { \ switch (sizeof_field(struct x8664_pda, field)) { \ case 2: asm volatile(op "w %0,%%gs:%P1" :: "r" (val), "i"(pda_offset(field)):"memory"); break; \ case 4: asm volatile(op "l %0,%%gs:%P1" :: "r" (val), "i"(pda_offset(field)):"memory"); break; \ case 8: asm volatile(op "q %0,%%gs:%P1" :: "r" (val), "i"(pda_offset(field)):"memory"); break; \ default: __bad_pda_field(); \ } \ } while (0) #define pda_from_op(op,field) ({ \ typedef typeof_field(struct x8664_pda, field) T__; T__ ret__; \ switch (sizeof_field(struct x8664_pda, field)) { \ case 2: asm volatile(op "w %%gs:%P1,%0":"=r" (ret__): "i" (pda_offset(field)):"memory"); break; \ case 4: asm volatile(op "l %%gs:%P1,%0":"=r" (ret__): "i" (pda_offset(field)):"memory"); break; \ case 8: asm volatile(op "q %%gs:%P1,%0":"=r" (ret__): "i" (pda_offset(field)):"memory"); 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) #endif
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