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make sure physmem is initialized

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add clarifying comments
Reviewed by: jb
Approved by: rwatson (mentor)
This commit is contained in:
Kip Macy 2006-11-03 07:27:55 +00:00
parent 0bf113a6ee
commit 00a8f0b4ff
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=163935
1 changed files with 14 additions and 5 deletions
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19
sys/sun4v/sun4v/pmap.c
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@ -500,24 +500,33 @@ pmap_bootstrap(vm_offset_t ekva)
CTR0(KTR_PMAP, "pmap_bootstrap: physical memory");
qsort(mra, sz, sizeof (*mra), mr_cmp);
physsz = 0;
if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
physmem_tunable = physmem = physsz = 0;
if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable)) {
physmem = atop(physmem_tunable);
KDPRINTF("desired physmem=0x%lx\n", physmem_tunable);
KDPRINTF("desired physmem=0x%lx\n", physmem_tunable);
}
for (i = 0, j = 0; i < sz; i++) {
vm_paddr_t start = mra[i].mr_start;
uint64_t size = mra[i].mr_size;
CTR2(KTR_PMAP, "start=%#lx size=%#lx\n", mra[i].mr_start, mra[i].mr_size);
KDPRINTF("start=%#lx size=%#lx\n", mra[i].mr_start, mra[i].mr_size);
/*
* Is kernel memory at the beginning of range?
*/
if (nucleus_memory_start == mra[i].mr_start) {
mra[i].mr_start += 2*PAGE_SIZE_4M;
mra[i].mr_size -= 2*PAGE_SIZE_4M;
}
/*
* Is kernel memory at the end of range?
*/
if (nucleus_memory_start == (start + size - 2*PAGE_SIZE_4M))
mra[i].mr_size -= 2*PAGE_SIZE_4M;
/*
* Is kernel memory in the middle somewhere?
*/
if ((nucleus_memory_start > start) && (nucleus_memory_start < (start + size))) {
uint64_t firstsize = (nucleus_memory_start - start);
phys_avail[j] = start;