/*
* kmap_free_wakeup:
*
* Returns memory to a submap of the kernel, and wakes up any processes
* waiting for memory in that map.
*/
void
kmap_free_wakeup(vm_map_t map, vm_offset_t addr, vm_size_t size)
{
vm_map_lock(map);
(void) vm_map_delete(map, trunc_page(addr), round_page(addr + size));
if (map->needs_wakeup) {
map->needs_wakeup = FALSE;
vm_map_wakeup(map);
}
vm_map_unlock(map);
}
static int findspace_demo(void) {
vm_map_t *orig = get_user_vm_map();
vm_map_t *umap = vm_map_new();
vm_map_activate(umap);
#define addr1 0x10000000
#define addr2 0x30000000
vm_map_add_entry(umap, addr1, addr2, VM_PROT_NONE);
#define addr3 0x30005000
#define addr4 0x60000000
vm_map_add_entry(umap, addr3, addr4, VM_PROT_NONE);
vm_addr_t t;
int n;
n = vm_map_findspace(umap, 0x00010000, PAGESIZE, &t);
assert(n == 0 && t == 0x00010000);
n = vm_map_findspace(umap, addr1, PAGESIZE, &t);
assert(n == 0 && t == addr2);
n = vm_map_findspace(umap, addr1 + 20 * PAGESIZE, PAGESIZE, &t);
assert(n == 0 && t == addr2);
n = vm_map_findspace(umap, addr1, 0x6000, &t);
assert(n == 0 && t == addr4);
n = vm_map_findspace(umap, addr1, 0x5000, &t);
assert(n == 0 && t == addr2);
/* Fill the gap exactly */
vm_map_add_entry(umap, t, t + 0x5000, VM_PROT_NONE);
n = vm_map_findspace(umap, addr1, 0x5000, &t);
assert(n == 0 && t == addr4);
n = vm_map_findspace(umap, addr4, 0x6000, &t);
assert(n == 0 && t == addr4);
n = vm_map_findspace(umap, 0, 0x40000000, &t);
assert(n == -ENOMEM);
/* Restore original vm_map */
vm_map_activate(orig);
vm_map_delete(umap);
klog("Test passed.");
return KTEST_SUCCESS;
}
static int paging_on_demand_and_memory_protection_demo(void) {
vm_map_t *orig = get_user_vm_map();
vm_map_activate(vm_map_new());
vm_map_t *kmap = get_kernel_vm_map();
vm_map_t *umap = get_user_vm_map();
klog("Kernel physical map : %08lx-%08lx", kmap->pmap->start, kmap->pmap->end);
klog("User physical map : %08lx-%08lx", umap->pmap->start, umap->pmap->end);
vm_addr_t start = 0x1001000;
vm_addr_t end = 0x1001000 + 2 * PAGESIZE;
vm_map_entry_t *redzone0 =
vm_map_add_entry(umap, start - PAGESIZE, start, VM_PROT_NONE);
vm_map_entry_t *redzone1 =
vm_map_add_entry(umap, end, end + PAGESIZE, VM_PROT_NONE);
vm_map_entry_t *data =
vm_map_add_entry(umap, start, end, VM_PROT_READ | VM_PROT_WRITE);
redzone0->object = vm_object_alloc();
redzone1->object = vm_object_alloc();
data->object = default_pager->pgr_alloc();
vm_map_dump(umap);
vm_map_dump(kmap);
/* Start in paged on demand range, but end outside, to cause fault */
for (int *ptr = (int *)start; ptr != (int *)end; ptr += 256) {
klog("%p", ptr);
*ptr = 0xfeedbabe;
}
vm_map_dump(umap);
vm_map_dump(kmap);
/* Restore original vm_map */
vm_map_activate(orig);
vm_map_delete(umap);
klog("Test passed.");
return KTEST_SUCCESS;
}
