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Handle dmmu protection faults as well as misses. Enable tracking of

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the modify and reference tte bits.  Implementing allocating of tsb pages.
Make tsb_stte_lookup do the right thing with the kernel pmap.
This commit is contained in:
Jake Burkholder 2001-08-06 02:34:20 +00:00
parent e15d0e4cf9
commit b3a1f1765a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=81186
1 changed files with 26 additions and 5 deletions
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31
sys/sparc64/sparc64/tsb.c
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@ -95,13 +95,25 @@ int
tsb_miss(pmap_t pm, u_int type, struct mmuframe *mf)
{
struct stte *stp;
struct tte tte;
vm_offset_t va;
va = mf->mf_tar;
va = TLB_TAR_VA(mf->mf_tar);
if ((stp = tsb_stte_lookup(pm, va)) == NULL)
return (EFAULT);
switch (type) {
case T_DMMU_MISS:
case T_DMMU_MISS | T_KERNEL:
stp->st_tte.tte_data |= TD_REF;
tte = stp->st_tte;
if ((tte.tte_data & TD_MOD) == 0)
tte.tte_data &= ~TD_W;
tlb_store(TLB_DTLB, va, tte);
break;
case T_DMMU_PROT | T_KERNEL:
if ((stp->st_tte.tte_data & TD_W) == 0)
return (EFAULT);
tlb_page_demap(TLB_DTLB, TLB_CTX_KERNEL, va);
stp->st_tte.tte_data |= TD_MOD;
tlb_store(TLB_DTLB, va, stp->st_tte);
break;
default:
@ -114,10 +126,16 @@ struct tte
tsb_page_alloc(pmap_t pm, vm_offset_t va)
{
struct tte tte;
vm_offset_t pa;
vm_page_t m;
/* XXX */
tte.tte_tag = 0;
tte.tte_data = 0;
m = vm_page_alloc(pm->pm_object, pm->pm_pages++, VM_ALLOC_SYSTEM);
if (m == NULL)
panic("tsb_page_alloc: vm_page_alloc\n");
pa = VM_PAGE_TO_PHYS(m);
tte.tte_tag = TT_CTX(TLB_CTX_KERNEL) | TT_VA(va);
tte.tte_data = TD_V | TD_8K | TD_VA_LOW(va) | TD_PA(pa) | TD_L |
TD_MOD | TD_REF | TD_CP | TD_P | TD_W;
return (tte);
}
@ -160,6 +178,9 @@ tsb_stte_lookup(pmap_t pm, vm_offset_t va)
u_int level;
u_int i;
if (pm == kernel_pmap)
return tsb_kvtostte(va);
va = trunc_page(va);
for (level = 0; level < TSB_DEPTH; level++) {
bucket = tsb_get_bucket(pm, level, va, 0);