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Get reserved memory regions and exclude them from available memory map

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This commit is contained in:
Oleksandr Tymoshenko 2012-11-30 03:11:03 +00:00
parent 1d1ffd9efb
commit c5a5698ccd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=243691
1 changed files with 71 additions and 1 deletions
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72
sys/arm/arm/machdep.c
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@ -1144,7 +1144,9 @@ physmap_init(struct mem_region *availmem_regions, int availmem_regions_sz)
void *
initarm(struct arm_boot_params *abp)
{
struct mem_region memory_regions[FDT_MEM_REGIONS];
struct mem_region availmem_regions[FDT_MEM_REGIONS];
struct mem_region reserved_regions[FDT_MEM_REGIONS];
struct pv_addr kernel_l1pt;
struct pv_addr dpcpu;
vm_offset_t dtbp, freemempos, l2_start, lastaddr;
@ -1154,7 +1156,12 @@ initarm(struct arm_boot_params *abp)
void *kmdp;
u_int l1pagetable;
int i = 0, j = 0, err_devmap = 0;
int memory_regions_sz;
int availmem_regions_sz;
int reserved_regions_sz;
vm_offset_t start, end;
vm_offset_t rstart, rend;
int curr;
lastaddr = parse_boot_param(abp);
memsize = 0;
@ -1185,10 +1192,73 @@ initarm(struct arm_boot_params *abp)
while (1);
/* Grab physical memory regions information from device tree. */
if (fdt_get_mem_regions(availmem_regions, &availmem_regions_sz,
if (fdt_get_mem_regions(memory_regions, &memory_regions_sz,
&memsize) != 0)
while(1);
/* Grab physical memory regions information from device tree. */
if (fdt_get_reserved_regions(reserved_regions, &reserved_regions_sz) != 0)
reserved_regions_sz = 0;
/*
* Now exclude all the reserved regions
*/
curr = 0;
for (i = 0; i < memory_regions_sz; i++) {
start = memory_regions[i].mr_start;
end = start + memory_regions[i].mr_size;
for (j = 0; j < reserved_regions_sz; j++) {
rstart = reserved_regions[j].mr_start;
rend = rstart + reserved_regions[j].mr_size;
/*
* Restricted region is before available
* Skip restricted region
*/
if (rend <= start)
continue;
/*
* Restricted region is behind available
* No further processing required
*/
if (rstart >= end)
break;
/*
* Restricted region includes memory region
* skip availble region
*/
if ((start >= rstart) && (rend >= end)) {
start = rend;
end = rend;
break;
}
/*
* Memory region includes restricted region
*/
if ((rstart > start) && (end > rend)) {
availmem_regions[curr].mr_start = start;
availmem_regions[curr++].mr_size = rstart - start;
start = rend;
break;
}
/*
* Memory region partially overlaps with restricted
*/
if ((rstart >= start) && (rstart <= end)) {
end = rstart;
}
else if ((rend >= start) && (rend <= end)) {
start = rend;
}
}
if (end > start) {
availmem_regions[curr].mr_start = start;
availmem_regions[curr++].mr_size = end - start;
}
}
availmem_regions_sz = curr;
/* Platform-specific initialisation */
pmap_bootstrap_lastaddr = initarm_lastaddr();