diff options
Diffstat (limited to 'sys/vm/vm_physmem.c')
| -rw-r--r-- | sys/vm/vm_physmem.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/sys/vm/vm_physmem.c b/sys/vm/vm_physmem.c index 89f9ee6..b6e7347 100644 --- a/sys/vm/vm_physmem.c +++ b/sys/vm/vm_physmem.c @@ -36,6 +36,11 @@ #include <vm/vm.h> #include <string.h> +#define BYTES_PER_MIB 8388608 + +static size_t pages_free = 0; +static size_t pages_used = 0; +static size_t pages_total = 0; static size_t highest_frame_idx = 0; static size_t bitmap_size = 0; static size_t bitmap_free_start = 0; @@ -60,9 +65,11 @@ physmem_populate_bitmap(void) for (size_t i = 0; i < resp->entry_count; ++i) { ent = resp->entries[i]; + pages_total += ent->length / DEFAULT_PAGESIZE; if (ent->type != LIMINE_MEMMAP_USABLE) { /* This memory is not usable */ + pages_used += ent->length / DEFAULT_PAGESIZE; continue; } @@ -73,6 +80,8 @@ physmem_populate_bitmap(void) for (size_t j = 0; j < ent->length; j += DEFAULT_PAGESIZE) { clrbit(bitmap, (ent->base + j) / DEFAULT_PAGESIZE); } + + pages_free += ent->length / DEFAULT_PAGESIZE; } } @@ -203,6 +212,36 @@ vm_free_frame(uintptr_t base, size_t count) spinlock_release(&lock); } +/* + * Return the amount of memory in MiB that is + * currently allocated. + */ +uint32_t +vm_mem_used(void) +{ + return (pages_used * DEFAULT_PAGESIZE) / BYTES_PER_MIB; +} + +/* + * Return the amount of memory in MiB that is + * currently free. + */ +uint32_t +vm_mem_free(void) +{ + return (pages_free * DEFAULT_PAGESIZE) / BYTES_PER_MIB; +} + +/* + * Return the total amount of memory supported + * by the machine. + */ +size_t +vm_mem_total(void) +{ + return (pages_total * DEFAULT_PAGESIZE) / BYTES_PER_MIB; +} + void vm_physmem_init(void) { |