diff options
author | grehan <grehan@FreeBSD.org> | 2005-03-07 01:46:06 +0000 |
---|---|---|
committer | grehan <grehan@FreeBSD.org> | 2005-03-07 01:46:06 +0000 |
commit | 98946b0cc7d4fd745e0ba9dba21df33a75d3b03c (patch) | |
tree | 9464b6664a6e7a858421bc8dd3c94ac9f2bc2ea7 /sys/powerpc/aim | |
parent | 7c1c0975e601ee1b4b264f5ab5d9573ed73ded89 (diff) | |
download | FreeBSD-src-98946b0cc7d4fd745e0ba9dba21df33a75d3b03c.zip FreeBSD-src-98946b0cc7d4fd745e0ba9dba21df33a75d3b03c.tar.gz |
Allow user to undersize memory with hw.physmem loader variable.
Obtained from: i386/machdep.c:getmemsize()
Diffstat (limited to 'sys/powerpc/aim')
-rw-r--r-- | sys/powerpc/aim/mmu_oea.c | 63 |
1 files changed, 62 insertions, 1 deletions
diff --git a/sys/powerpc/aim/mmu_oea.c b/sys/powerpc/aim/mmu_oea.c index 758418b..14409a0 100644 --- a/sys/powerpc/aim/mmu_oea.c +++ b/sys/powerpc/aim/mmu_oea.c @@ -524,6 +524,55 @@ om_cmp(const void *a, const void *b) return (0); } +static vm_size_t +pmap_tunable_physmem(void) +{ + char *cp; + vm_size_t retval; + + retval = 0; + + if ((cp = getenv("hw.physmem")) != NULL) { + u_int64_t allowmem, sanity; + char *ep; + + sanity = allowmem = strtouq(cp, &ep, 0); + if ((ep != cp) && (*ep != 0)) { + switch(*ep) { + case 'g': + case 'G': + /* + * Can't have more than 4G of RAM + */ + if (allowmem > 4) { + printf("Invalid memory size '%s'\n", + cp); + return (0); + } + allowmem <<= 10; + case 'm': + case 'M': + allowmem <<= 10; + case 'k': + case 'K': + allowmem <<= 10; + break; + default: + allowmem = sanity = 0; + } + if (allowmem < sanity) + allowmem = 0; + } + if (allowmem == 0) + printf("Ignoring invalid memory size of '%s'\n", cp); + else + retval = allowmem; + freeenv(cp); + } + + return (retval); +} + void pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend) { @@ -532,7 +581,7 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend) int sz; int i, j; int ofw_mappings; - vm_size_t size, physsz; + vm_size_t size, physsz, hwphyssz; vm_offset_t pa, va, off; u_int batl, batu; @@ -630,10 +679,22 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend) qsort(regions, regions_sz, sizeof(*regions), mr_cmp); phys_avail_count = 0; physsz = 0; + hwphyssz = pmap_tunable_physmem(); for (i = 0, j = 0; i < regions_sz; i++, j += 2) { CTR3(KTR_PMAP, "region: %#x - %#x (%#x)", regions[i].mr_start, regions[i].mr_start + regions[i].mr_size, regions[i].mr_size); + if (hwphyssz != 0 && + (physsz + regions[i].mr_size) >= hwphyssz) { + if (physsz < hwphyssz) { + phys_avail[j] = regions[i].mr_start; + phys_avail[j + 1] = regions[i].mr_start + + hwphyssz - physsz; + physsz = hwphyssz; + phys_avail_count++; + } + break; + } phys_avail[j] = regions[i].mr_start; phys_avail[j + 1] = regions[i].mr_start + regions[i].mr_size; phys_avail_count++; |