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Add hw.physmemstart loader variable to enable the user to specify the address

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at which the kernel should start allocating physical memory. The primary
purpose of this is to test 64-bit cleanness of the data path by setting
hw.physmemstart=4G so that all physical allocations are above 4GB. AMD64
and i386/PAE could also benefit from having this option.
This commit is contained in:
Kip Macy 2006-12-10 01:52:46 +00:00
parent 5bac03f95c
commit 42b20c8aa2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=165059
1 changed files with 20 additions and 11 deletions
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31
sys/sun4v/sun4v/pmap.c
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@ -448,7 +448,7 @@ pmap_bootstrap(vm_offset_t ekva)
vm_size_t physsz, virtsz, kernel_hash_shift;
ihandle_t pmem, vmem;
int i, j, k, sz;
uint64_t tsb_8k_size, tsb_4m_size, error, physmem_tunable;
uint64_t tsb_8k_size, tsb_4m_size, error, physmem_tunable, physmemstart_tunable;
vm_paddr_t real_phys_avail[128], tmp_phys_avail[128];
if ((vmem = OF_finddevice("/virtual-memory")) == -1)
@ -489,7 +489,6 @@ pmap_bootstrap(vm_offset_t ekva)
#ifdef SMP
mp_add_nucleus_mapping(va, pa|TTE_KERNEL|VTD_4M);
#endif
}
}
}
@ -515,13 +514,17 @@ pmap_bootstrap(vm_offset_t ekva)
CTR0(KTR_PMAP, "pmap_bootstrap: physical memory");
qsort(mra, sz, sizeof (*mra), mr_cmp);
physmem_tunable = physmem = physsz = 0;
physmemstart_tunable = physmem_tunable = physmem = physsz = 0;
if (TUNABLE_ULONG_FETCH("hw.physmemstart", &physmemstart_tunable)) {
KDPRINTF("desired physmemstart=0x%lx\n", physmemstart_tunable);
}
if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable)) {
physmem = atop(physmem_tunable);
KDPRINTF("desired physmem=0x%lx\n", physmem_tunable);
}
physmem_tunable += physmemstart_tunable;
bzero(real_phys_avail, sizeof(real_phys_avail));
bzero(tmp_phys_avail, sizeof(tmp_phys_avail));
@ -552,20 +555,17 @@ pmap_bootstrap(vm_offset_t ekva)
real_phys_avail[j + 1] = mra[i].mr_start + mra[i].mr_size;
j += 2;
}
physmem = btoc(physsz);
physmem = btoc(physsz - physmemstart_tunable);
/*
* This is needed for versions of OFW that would allocate us memory
* and then forget to remove it from the available ranges ...
* as well as for compensating for the above move of nucleus pages
*/
for (i = 0; real_phys_avail[i] != 0; i += 2) {
for (i = 0, j = 0; real_phys_avail[i] != 0; i += 2) {
vm_paddr_t start = real_phys_avail[i];
uint64_t size = real_phys_avail[i + 1] - real_phys_avail[i];
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);
CTR2(KTR_PMAP, "start=%#lx size=%#lx\n", start,size);
KDPRINTF("real_phys start=%#lx size=%#lx\n", start, size);
/*
* Is kernel memory at the beginning of range?
*/
@ -578,6 +578,15 @@ pmap_bootstrap(vm_offset_t ekva)
if (nucleus_memory_start == (start + size - nucleus_memory))
size -= nucleus_memory;
if (physmemstart_tunable != 0 &&
((mra[i].mr_start + mra[i].mr_size) < physmemstart_tunable))
continue;
if (physmemstart_tunable != 0 &&
((start < physmemstart_tunable))) {
size -= (physmemstart_tunable - start);
start = physmemstart_tunable;
}
/*
* Is kernel memory in the middle somewhere?
*/