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uvm_pagealloc(9) can fail, so handle that case in pmap_enter(9).

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This commit is contained in:
tsutsui 2006-08-07 23:19:36 +00:00
parent 08d26dfcb7
commit 5011ef47f2
1 changed files with 17 additions and 4 deletions
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21
sys/arch/sh3/sh3/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.54 2006/03/04 01:13:35 uwe Exp $ */
/* $NetBSD: pmap.c,v 1.55 2006/08/07 23:19:36 tsutsui Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.54 2006/03/04 01:13:35 uwe Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.55 2006/08/07 23:19:36 tsutsui Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -310,7 +310,7 @@ pmap_enter(pmap_t pmap, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags)
{
struct vm_page *pg;
struct vm_page_md *pvh;
pt_entry_t entry;
pt_entry_t entry, *pte;
boolean_t kva = (pmap == pmap_kernel());
/* "flags" never exceed "prot" */
@ -368,7 +368,18 @@ pmap_enter(pmap_t pmap, vaddr_t va, paddr_t pa, vm_prot_t prot, int flags)
}
/* Register to page table */
*__pmap_pte_alloc(pmap, va) = entry;
if (kva)
pte = __pmap_kpte_lookup(va);
else {
pte = __pmap_pte_alloc(pmap, va);
if (pte == NULL) {
if (flags & PMAP_CANFAIL)
return ENOMEM;
panic("pmap_enter: cannot allocate pte");
}
}
*pte = entry;
if (pmap->pm_asid != -1)
sh_tlb_update(pmap->pm_asid, va, entry);
@ -892,6 +903,8 @@ __pmap_pte_alloc(pmap_t pmap, vaddr_t va)
/* Allocate page table (not managed page) */
pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_USERESERVE | UVM_PGA_ZERO);
if (pg == NULL)
return NULL;
ptp = (pt_entry_t *)SH3_PHYS_TO_P1SEG(VM_PAGE_TO_PHYS(pg));
pmap->pm_ptp[__PMAP_PTP_INDEX(va)] = ptp;