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synced 2024-12-16 10:20:30 +00:00
Allow user to undersize memory with hw.physmem loader variable.
Obtained from: i386/machdep.c:getmemsize()
This commit is contained in:
Peter Grehan
parent
cebf474d0d
commit
e2f6d6e28a
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=143200
@ -524,6 +524,55 @@ om_cmp(const void *a, const void *b)
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return (0);
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}
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static vm_size_t
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pmap_tunable_physmem(void)
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{
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char *cp;
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vm_size_t retval;
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retval = 0;
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if ((cp = getenv("hw.physmem")) != NULL) {
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u_int64_t allowmem, sanity;
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char *ep;
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sanity = allowmem = strtouq(cp, &ep, 0);
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if ((ep != cp) && (*ep != 0)) {
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switch(*ep) {
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case 'g':
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case 'G':
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/*
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* Can't have more than 4G of RAM
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*/
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if (allowmem > 4) {
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printf("Invalid memory size '%s'\n",
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cp);
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return (0);
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}
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allowmem <<= 10;
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case 'm':
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case 'M':
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allowmem <<= 10;
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case 'k':
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case 'K':
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allowmem <<= 10;
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break;
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default:
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allowmem = sanity = 0;
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}
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if (allowmem < sanity)
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allowmem = 0;
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}
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if (allowmem == 0)
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printf("Ignoring invalid memory size of '%s'\n", cp);
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else
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retval = allowmem;
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freeenv(cp);
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}
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return (retval);
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}
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void
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pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
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{
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@ -532,7 +581,7 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
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int sz;
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int i, j;
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int ofw_mappings;
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vm_size_t size, physsz;
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vm_size_t size, physsz, hwphyssz;
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vm_offset_t pa, va, off;
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u_int batl, batu;
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@ -630,10 +679,22 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
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qsort(regions, regions_sz, sizeof(*regions), mr_cmp);
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phys_avail_count = 0;
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physsz = 0;
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hwphyssz = pmap_tunable_physmem();
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for (i = 0, j = 0; i < regions_sz; i++, j += 2) {
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CTR3(KTR_PMAP, "region: %#x - %#x (%#x)", regions[i].mr_start,
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regions[i].mr_start + regions[i].mr_size,
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regions[i].mr_size);
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if (hwphyssz != 0 &&
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(physsz + regions[i].mr_size) >= hwphyssz) {
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if (physsz < hwphyssz) {
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phys_avail[j] = regions[i].mr_start;
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phys_avail[j + 1] = regions[i].mr_start +
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hwphyssz - physsz;
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physsz = hwphyssz;
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phys_avail_count++;
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}
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break;
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}
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phys_avail[j] = regions[i].mr_start;
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phys_avail[j + 1] = regions[i].mr_start + regions[i].mr_size;
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phys_avail_count++;
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@ -524,6 +524,55 @@ om_cmp(const void *a, const void *b)
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return (0);
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}
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static vm_size_t
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pmap_tunable_physmem(void)
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{
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char *cp;
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vm_size_t retval;
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retval = 0;
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if ((cp = getenv("hw.physmem")) != NULL) {
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u_int64_t allowmem, sanity;
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char *ep;
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sanity = allowmem = strtouq(cp, &ep, 0);
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if ((ep != cp) && (*ep != 0)) {
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switch(*ep) {
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case 'g':
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case 'G':
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/*
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* Can't have more than 4G of RAM
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*/
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if (allowmem > 4) {
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printf("Invalid memory size '%s'\n",
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cp);
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return (0);
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}
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allowmem <<= 10;
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case 'm':
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case 'M':
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allowmem <<= 10;
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case 'k':
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case 'K':
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allowmem <<= 10;
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break;
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default:
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allowmem = sanity = 0;
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}
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if (allowmem < sanity)
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allowmem = 0;
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}
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if (allowmem == 0)
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printf("Ignoring invalid memory size of '%s'\n", cp);
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else
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retval = allowmem;
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freeenv(cp);
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}
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return (retval);
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}
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void
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pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
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{
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@ -532,7 +581,7 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
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int sz;
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int i, j;
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int ofw_mappings;
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vm_size_t size, physsz;
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vm_size_t size, physsz, hwphyssz;
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vm_offset_t pa, va, off;
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u_int batl, batu;
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@ -630,10 +679,22 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
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qsort(regions, regions_sz, sizeof(*regions), mr_cmp);
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phys_avail_count = 0;
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physsz = 0;
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hwphyssz = pmap_tunable_physmem();
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for (i = 0, j = 0; i < regions_sz; i++, j += 2) {
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CTR3(KTR_PMAP, "region: %#x - %#x (%#x)", regions[i].mr_start,
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regions[i].mr_start + regions[i].mr_size,
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regions[i].mr_size);
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if (hwphyssz != 0 &&
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(physsz + regions[i].mr_size) >= hwphyssz) {
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if (physsz < hwphyssz) {
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phys_avail[j] = regions[i].mr_start;
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phys_avail[j + 1] = regions[i].mr_start +
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hwphyssz - physsz;
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physsz = hwphyssz;
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phys_avail_count++;
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}
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break;
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}
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phys_avail[j] = regions[i].mr_start;
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phys_avail[j + 1] = regions[i].mr_start + regions[i].mr_size;
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phys_avail_count++;
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@ -524,6 +524,55 @@ om_cmp(const void *a, const void *b)
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return (0);
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}
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static vm_size_t
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pmap_tunable_physmem(void)
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{
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char *cp;
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vm_size_t retval;
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retval = 0;
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if ((cp = getenv("hw.physmem")) != NULL) {
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u_int64_t allowmem, sanity;
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char *ep;
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sanity = allowmem = strtouq(cp, &ep, 0);
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if ((ep != cp) && (*ep != 0)) {
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switch(*ep) {
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case 'g':
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case 'G':
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/*
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* Can't have more than 4G of RAM
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*/
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if (allowmem > 4) {
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printf("Invalid memory size '%s'\n",
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cp);
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return (0);
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}
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allowmem <<= 10;
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case 'm':
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case 'M':
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allowmem <<= 10;
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case 'k':
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case 'K':
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allowmem <<= 10;
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break;
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default:
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allowmem = sanity = 0;
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}
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if (allowmem < sanity)
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allowmem = 0;
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}
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if (allowmem == 0)
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printf("Ignoring invalid memory size of '%s'\n", cp);
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else
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retval = allowmem;
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freeenv(cp);
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}
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return (retval);
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}
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void
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pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
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{
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@ -532,7 +581,7 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
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int sz;
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int i, j;
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int ofw_mappings;
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vm_size_t size, physsz;
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vm_size_t size, physsz, hwphyssz;
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vm_offset_t pa, va, off;
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u_int batl, batu;
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@ -630,10 +679,22 @@ pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
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qsort(regions, regions_sz, sizeof(*regions), mr_cmp);
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phys_avail_count = 0;
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physsz = 0;
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hwphyssz = pmap_tunable_physmem();
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for (i = 0, j = 0; i < regions_sz; i++, j += 2) {
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CTR3(KTR_PMAP, "region: %#x - %#x (%#x)", regions[i].mr_start,
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regions[i].mr_start + regions[i].mr_size,
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regions[i].mr_size);
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if (hwphyssz != 0 &&
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(physsz + regions[i].mr_size) >= hwphyssz) {
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if (physsz < hwphyssz) {
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phys_avail[j] = regions[i].mr_start;
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phys_avail[j + 1] = regions[i].mr_start +
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hwphyssz - physsz;
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physsz = hwphyssz;
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phys_avail_count++;
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}
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break;
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}
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phys_avail[j] = regions[i].mr_start;
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phys_avail[j + 1] = regions[i].mr_start + regions[i].mr_size;
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phys_avail_count++;
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