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Don't use the tpa instruction to implement pmap_kextract. The tpa

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instruction requires that a translation is present in the TC. This
may trigger a TLB miss and a subsequent call to vm_fault().
This implementation is deliberately non-inline for debugging and
profiling purposes. Partial or full inlining should eventually be
done.

Valuable insights by: jake
This commit is contained in:
marcel 2003-04-22 01:48:43 +00:00
parent eea2b01ecc
commit bbf5306d5f
2 changed files with 26 additions and 8 deletions
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25
sys/ia64/ia64/pmap.c
View File

@ -1333,6 +1333,31 @@ pmap_remove_pte(pmap_t pmap, struct ia64_lpte *pte, vm_offset_t va,
}
}
/*
* Extract the physical page address associated with a kernel
* virtual address.
*/
vm_paddr_t
pmap_kextract(vm_offset_t va)
{
struct ia64_lpte *pte;
KASSERT(va >= IA64_RR_BASE(5), ("Must be kernel VA"));
/* Regions 6 and 7 are direct mapped. */
if (va >= IA64_RR_BASE(6))
return (IA64_RR_MASK(va));
/* Bail out if the virtual address is beyond our limits. */
if (IA64_RR_MASK(va) >= nkpt * PAGE_SIZE * NKPTEPG)
return (0);
pte = pmap_find_kpte(va);
if (!pte->pte_p)
return (0);
return ((pte->pte_ppn << 12) | (va & PAGE_MASK));
}
/*
* Add a list of wired pages to the kva
* this routine is only used for temporary

9
sys/ia64/include/pmap.h
View File

@ -59,14 +59,6 @@
#endif
#define MAXKPT (PAGE_SIZE/sizeof(vm_offset_t))
/*
* Routine: pmap_kextract
* Function:
* Extract the physical page address associated
* kernel virtual address.
*/
#define pmap_kextract ia64_tpa
#define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
#endif /* _KERNEL */
@ -127,6 +119,7 @@ extern vm_offset_t virtual_end;
vm_offset_t pmap_steal_memory(vm_size_t);
void pmap_bootstrap(void);
void pmap_kenter(vm_offset_t va, vm_offset_t pa);
vm_paddr_t pmap_kextract(vm_offset_t va);
void pmap_kremove(vm_offset_t);
void pmap_setdevram(unsigned long long basea, vm_offset_t sizea);
int pmap_uses_prom_console(void);