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Fix the same race condition on 32-bit AIM CPUs that was fixed for 64-bit

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ones in r211967 involving VSID allocation.
This commit is contained in:
Nathan Whitehorn 2010-09-06 23:07:58 +00:00
parent 50398e411f
commit e9b5f21819
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=212278
1 changed files with 7 additions and 0 deletions
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7
sys/powerpc/aim/mmu_oea.c
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@ -203,6 +203,7 @@ extern struct pmap ofw_pmap;
* Lock for the pteg and pvo tables.
*/
struct mtx moea_table_mutex;
struct mtx moea_vsid_mutex;
/* tlbie instruction synchronization */
static struct mtx tlbie_mtx;
@ -819,6 +820,7 @@ moea_bootstrap(mmu_t mmup, vm_offset_t kernelstart, vm_offset_t kernelend)
*/
mtx_init(&moea_table_mutex, "pmap table", NULL, MTX_DEF |
MTX_RECURSE);
mtx_init(&moea_vsid_mutex, "VSID table", NULL, MTX_DEF);
mtx_init(&tlbie_mtx, "tlbie", NULL, MTX_SPIN);
@ -1589,6 +1591,7 @@ moea_pinit(mmu_t mmu, pmap_t pmap)
}
mtx_lock(&moea_vsid_mutex);
/*
* Allocate some segment registers for this pmap.
*/
@ -1623,9 +1626,11 @@ moea_pinit(mmu_t mmu, pmap_t pmap)
moea_vsid_bitmap[n] |= mask;
for (i = 0; i < 16; i++)
pmap->pm_sr[i] = VSID_MAKE(i, hash);
mtx_unlock(&moea_vsid_mutex);
return;
}
mtx_unlock(&moea_vsid_mutex);
panic("moea_pinit: out of segments");
}
@ -1737,10 +1742,12 @@ moea_release(mmu_t mmu, pmap_t pmap)
if (pmap->pm_sr[0] == 0)
panic("moea_release");
mtx_lock(&moea_vsid_mutex);
idx = VSID_TO_HASH(pmap->pm_sr[0]) & (NPMAPS-1);
mask = 1 << (idx % VSID_NBPW);
idx /= VSID_NBPW;
moea_vsid_bitmap[idx] &= ~mask;
mtx_unlock(&moea_vsid_mutex);
PMAP_LOCK_DESTROY(pmap);
}