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Do not remap Open Firmware mappings covered by the direct map. It's

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pointless and wastes resources.

MFC after:	1 week
This commit is contained in:
Nathan Whitehorn 2015-01-14 02:18:29 +00:00
parent d84d6e7716
commit bf27800837
1 changed files with 7 additions and 0 deletions
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7
sys/powerpc/aim/mmu_oea64.c
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@ -224,6 +224,8 @@ uma_zone_t moea64_mpvo_zone; /* zone for pvo entries for managed pages */
#define BPVO_POOL_SIZE 327680
static struct pvo_entry *moea64_bpvo_pool;
static int moea64_bpvo_pool_index = 0;
SYSCTL_INT(_machdep, OID_AUTO, moea64_allocated_bpvo_entries, CTLFLAG_RD,
&moea64_bpvo_pool_index, 0, "");
#define VSID_NBPW (sizeof(u_int32_t) * 8)
#ifdef __powerpc64__
@ -534,6 +536,11 @@ moea64_add_ofw_mappings(mmu_t mmup, phandle_t mmu, size_t sz)
DISABLE_TRANS(msr);
for (off = 0; off < translations[i].om_len; off += PAGE_SIZE) {
/* If this address is direct-mapped, skip remapping */
if (hw_direct_map && translations[i].om_va == pa_base &&
moea64_calc_wimg(pa_base + off, VM_MEMATTR_DEFAULT) == LPTE_M)
continue;
if (moea64_pvo_find_va(kernel_pmap,
translations[i].om_va + off) != NULL)
continue;