mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
#ifndef X86_64_PDA_H
|
|
#define X86_64_PDA_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/stddef.h>
|
|
#include <linux/types.h>
|
|
#include <linux/cache.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 */
|
|
struct x8664_pda *me; /* Pointer to itself */
|
|
unsigned long kernelstack; /* top of kernel stack for current */
|
|
unsigned long oldrsp; /* user rsp for system call */
|
|
unsigned long irqrsp; /* Old rsp for interrupts. */
|
|
int irqcount; /* Irq nesting counter. Starts with -1 */
|
|
int cpunumber; /* Logical CPU number */
|
|
char *irqstackptr; /* top of irqstack */
|
|
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;
|
|
|
|
|
|
#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);
|
|
|
|
#define pda_offset(field) offsetof(struct x8664_pda, 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)
|
|
|
|
/*
|
|
* 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) ({ \
|
|
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
|
|
|
|
#define PDA_STACKOFFSET (5*8)
|
|
|
|
#endif
|