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#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; /* Current process */ unsigned long data_offset; /* Per cpu data offset from linker address */ unsigned long kernelstack; /* top of kernel stack for current */ unsigned long oldrsp; /* user rsp for system call */ #if DEBUG_STKSZ > EXCEPTION_STKSZ unsigned long debugstack; /* #DB/#BP stack. */ #endif int irqcount; /* Irq nesting counter. Starts with -1 */ int cpunumber; /* Logical CPU number */ char *irqstackptr; /* top of irqstack */ int nodenumber; /* number of current node */ unsigned int __softirq_pending; unsigned int __nmi_count; /* number of NMI on this CPUs */ struct mm_struct *active_mm; int mmu_state; unsigned apic_timer_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. */ #define sizeof_field(type,field) (sizeof(((type *)0)->field)) #define typeof_field(type,field) typeof(((type *)0)->field) extern void __bad_pda_field(void); #define pda_offset(field) offsetof(struct x8664_pda, field) #define pda_to_op(op,field,val) do { \ typedef typeof_field(struct x8664_pda, field) T__; \ switch (sizeof_field(struct x8664_pda, field)) { \ case 2: \ asm volatile(op "w %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \ case 4: \ asm volatile(op "l %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \ case 8: \ asm volatile(op "q %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \ default: __bad_pda_field(); \ } \ } while (0) /* * AK: PDA read accesses should be neither volatile nor have an memory clobber. * Unfortunately removing them causes all hell to break lose currently. */ #define pda_from_op(op,field) ({ \ typeof_field(struct x8664_pda, field) 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) #define or_pda(field,val) pda_to_op("or",field,val) #endif #define PDA_STACKOFFSET (5*8) #endif