/*
* Initialize page allocator.
* page_init() must be called prior to other memory manager's
* initializations.
*/
void
page_init(void)
{
struct physmem *ram;
int i;
total_size = 0;
bootdisk_size = 0;
page_head.next = page_head.prev = &page_head;
/*
* First, create a free list from the boot information.
*/
for (i = 0; i < bootinfo->nr_rams; i++) {
ram = &bootinfo->ram[i];
if (ram->type == MT_USABLE) {
page_free((void *)ram->base, ram->size);
total_size += ram->size;
}
}
/*
* Then, reserve un-usable memory.
*/
for (i = 0; i < bootinfo->nr_rams; i++) {
ram = &bootinfo->ram[i];
switch (ram->type) {
case MT_BOOTDISK:
bootdisk_size = ram->size;
/* FALLTHROUGH */
case MT_MEMHOLE:
total_size -= ram->size;
/* FALLTHROUGH */
case MT_RESERVED:
page_reserve((void *)ram->base, ram->size);
break;
}
}
#ifdef DEBUG
page_dump();
#endif
}
/*
* Machine-dependent startup code
*/
void
machine_startup(void)
{
void *vector_offset = 0;
/*
* Reserve system pages.
*/
page_reserve(kvtop(SYSPAGE), SYSPAGESZ);
/*
* Copy exception vectors.
*/
memcpy(vector_offset, &exception_vector, 0x3000);
#ifdef CONFIG_MMU
/*
* Initialize MMU
*/
mmu_init(mmumap_table);
#endif
}
static int
do_allocate(vm_map_t map, void **addr, size_t size, int anywhere)
{
struct region *reg;
char *start, *end;
if (size == 0)
return EINVAL;
/*
* Allocate region, and reserve pages for it.
*/
if (anywhere) {
size = (size_t)PAGE_ALIGN(size);
if ((start = page_alloc(size)) == 0)
return ENOMEM;
} else {
start = (char *)PAGE_TRUNC(*addr);
end = (char *)PAGE_ALIGN(start + size);
size = (size_t)(end - start);
if (page_reserve(start, size))
return EINVAL;
}
reg = region_create(&map->head, start, size);
if (reg == NULL) {
page_free(start, size);
return ENOMEM;
}
reg->flags = REG_READ | REG_WRITE;
/* Zero fill */
memset(start, 0, size);
*addr = reg->addr;
return 0;
}
