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Allow user to undersize memory with hw.physmem loader variable.

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Obtained from:  i386/machdep.c:getmemsize()
This commit is contained in:
Peter Grehan 2005-03-07 01:46:06 +00:00
parent cebf474d0d
commit e2f6d6e28a
3 changed files with 186 additions and 3 deletions
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63
sys/powerpc/aim/mmu_oea.c
View File

@ -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++;

63
sys/powerpc/powerpc/mmu_oea.c
View File

@ -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++;

63
sys/powerpc/powerpc/pmap.c
View File

@ -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++;