/* Retypes an untyped object to the specified object of specified size, storing a cap to that object
* in the specified slot of the cspace whose root is root_cnode. This requires that the root_cnode
* argument is also the root cnode of the cspace of the calling thread.
*/
int untyped_retype_root(seL4_CPtr untyped, seL4_ObjectType type, int size_bits, seL4_CPtr root_cnode, seL4_CPtr slot) {
return seL4_Untyped_Retype(untyped /* untyped cap */,
type /* type */,
size_bits /* size */,
root_cnode /* root cnode cap */,
root_cnode /* destination cspace */,
32 /* depth */,
slot /* offset */,
1 /* num objects */);
}
seL4_Error simple_default_get_frame_cap(void *data, void *paddr, int size_bits, cspacepath_t *path) {
unsigned int i;
seL4_BootInfo *bi = (seL4_BootInfo *) data;
assert(bi && paddr);
for (i = 0; i < bi->untyped.end - bi->untyped.start; i++) {
if (bi->untypedList[i].paddr == (seL4_Word)paddr &&
bi->untypedList[i].sizeBits >= size_bits) {
return seL4_Untyped_Retype(bi->untyped.start + i, kobject_get_type(KOBJECT_FRAME, size_bits),
size_bits, path->root, path->dest, path->destDepth, path->offset, 1);
}
}
return seL4_FailedLookup;
}
uint32_t _utspace_split_alloc(allocman_t *alloc, void *_split, uint32_t size_bits, seL4_Word type, cspacepath_t *slot, int *error)
{
utspace_split_t *split = (utspace_split_t*)_split;
uint32_t sel4_size_bits;
int sel4_error;
struct utspace_split_node *node;
/* get size of untyped call */
sel4_size_bits = get_sel4_object_size(type, size_bits);
if (size_bits != vka_get_object_size(type, sel4_size_bits) || size_bits == 0) {
SET_ERROR(error, 1);
return 0;
}
/* make sure we have an available untyped */
if (_refill_pool(alloc, split, size_bits)) {
/* out of memory? */
SET_ERROR(error, 1);
return 0;
}
/* use the first node for lack of a better one */
node = split->heads[size_bits];
/* Perform the untyped retype */
#if defined(CONFIG_KERNEL_STABLE)
sel4_error = seL4_Untyped_RetypeAtOffset(node->ut.capPtr, type, 0, sel4_size_bits, slot->root, slot->dest, slot->destDepth, slot->offset, 1);
#else
sel4_error = seL4_Untyped_Retype(node->ut.capPtr, type, sel4_size_bits, slot->root, slot->dest, slot->destDepth, slot->offset, 1);
#endif
if (sel4_error != seL4_NoError) {
/* Well this shouldn't happen */
SET_ERROR(error, 1);
return 0;
}
/* remove the node */
_remove_node(&split->heads[size_bits], node);
SET_ERROR(error, 0);
/* return the node as a cookie */
return (uint32_t)node;
}
seL4_Word _utspace_split_alloc(allocman_t *alloc, void *_split, size_t size_bits, seL4_Word type, const cspacepath_t *slot, uintptr_t paddr, bool canBeDev, int *error)
{
utspace_split_t *split = (utspace_split_t*)_split;
size_t sel4_size_bits;
int sel4_error;
struct utspace_split_node *node;
/* get size of untyped call */
sel4_size_bits = get_sel4_object_size(type, size_bits);
if (size_bits != vka_get_object_size(type, sel4_size_bits) || size_bits == 0) {
SET_ERROR(error, 1);
return 0;
}
struct utspace_split_node **head = NULL;
/* if we're allocating at a particular paddr then we will just trawl through every pool
* and see if we can find out which one has what we want */
if (paddr != ALLOCMAN_NO_PADDR) {
if (canBeDev) {
head = find_head_for_paddr(split->dev_heads, paddr, size_bits);
if (!head) {
head = find_head_for_paddr(split->dev_mem_heads, paddr, size_bits);
}
}
if (!head) {
head = find_head_for_paddr(split->heads, paddr, size_bits);
}
if (!head) {
SET_ERROR(error, 1);
ZF_LOGE("Failed to find any untyped capable of creating an object at address %p", (void*)paddr);
return 0;
}
if (_refill_pool(alloc, split, head, size_bits, paddr)) {
/* out of memory? */
SET_ERROR(error, 1);
ZF_LOGV("Failed to refill pool to allocate object of size %zu", size_bits);
return 0;
}
/* search for the node we want to use. We have the advantage of knowing that
* due to objects being size aligned that the base paddr of the untyped will
* be exactly the paddr we want */
for (node = head[size_bits]; node && node->paddr != paddr; node = node->next);
/* _refill_pool should not have returned if this wasn't possible */
assert(node);
} else {
/* if we can use device memory then preference allocating from there */
if (canBeDev) {
if (_refill_pool(alloc, split, split->dev_mem_heads, size_bits, ALLOCMAN_NO_PADDR)) {
/* out of memory? */
SET_ERROR(error, 1);
ZF_LOGV("Failed to refill pool to allocate object of size %zu", size_bits);
return 0;
}
head = split->dev_mem_heads;
}
if (!head) {
head = split->heads;
if (_refill_pool(alloc, split, head, size_bits, ALLOCMAN_NO_PADDR)) {
/* out of memory? */
SET_ERROR(error, 1);
ZF_LOGV("Failed to refill pool to allocate object of size %zu", size_bits);
return 0;
}
}
/* use the first node for lack of a better one */
node = head[size_bits];
}
/* Perform the untyped retype */
sel4_error = seL4_Untyped_Retype(node->ut.capPtr, type, sel4_size_bits, slot->root, slot->dest, slot->destDepth, slot->offset, 1);
if (sel4_error != seL4_NoError) {
/* Well this shouldn't happen */
ZF_LOGE("Failed to retype untyped, error %d\n", sel4_error);
SET_ERROR(error, 1);
return 0;
}
/* remove the node */
_remove_node(&head[size_bits], node);
SET_ERROR(error, 0);
/* return the node as a cookie */
return (seL4_Word)node;
}
static int _refill_pool(allocman_t *alloc, utspace_split_t *split, struct utspace_split_node **heads, size_t size_bits, uintptr_t paddr) {
struct utspace_split_node *node;
struct utspace_split_node *left, *right;
int sel4_error;
if (paddr == ALLOCMAN_NO_PADDR) {
/* see if pool is actually empty */
if (heads[size_bits]) {
return 0;
}
} else {
/* see if the pool has the paddr we want */
for (node = heads[size_bits]; node; node = node->next) {
if (node->paddr <= paddr && paddr < node->paddr + BIT(size_bits)) {
return 0;
}
}
}
/* ensure we are not the highest pool */
if (size_bits >= sizeof(seL4_Word) * 8 - 2) {
/* bugger, no untypeds bigger than us */
ZF_LOGV("Failed to refill pool of size %zu, no larger pools", size_bits);
return 1;
}
/* get something from the highest pool */
if (_refill_pool(alloc, split, heads, size_bits + 1, paddr)) {
/* could not fill higher pool */
ZF_LOGV("Failed to refill pool of size %zu", size_bits);
return 1;
}
if (paddr == ALLOCMAN_NO_PADDR) {
/* use the first node for lack of a better one */
node = heads[size_bits + 1];
} else {
for (node = heads[size_bits + 1]; node && !(node->paddr <= paddr && paddr < node->paddr + BIT(size_bits + 1)); node = node->next);
/* _refill_pool should not have returned if this wasn't possible */
assert(node);
}
/* allocate two new nodes */
left = _new_node(alloc);
if (!left) {
ZF_LOGV("Failed to allocate left node");
return 1;
}
right = _new_node(alloc);
if (!right) {
ZF_LOGV("Failed to allocate right node");
_delete_node(alloc, left);
return 1;
}
/* perform the first retype */
sel4_error = seL4_Untyped_Retype(node->ut.capPtr, seL4_UntypedObject, size_bits, left->ut.root, left->ut.dest, left->ut.destDepth, left->ut.offset, 1);
if (sel4_error != seL4_NoError) {
_delete_node(alloc, left);
_delete_node(alloc, right);
/* Well this shouldn't happen */
ZF_LOGE("Failed to retype untyped, error %d\n", sel4_error);
return 1;
}
/* perform the second retype */
sel4_error = seL4_Untyped_Retype(node->ut.capPtr, seL4_UntypedObject, size_bits, right->ut.root, right->ut.dest, right->ut.destDepth, right->ut.offset, 1);
if (sel4_error != seL4_NoError) {
vka_cnode_delete(&left->ut);
_delete_node(alloc, left);
_delete_node(alloc, right);
/* Well this shouldn't happen */
ZF_LOGE("Failed to retype untyped, error %d\n", sel4_error);
return 1;
}
/* all is done. remove the parent and insert the children */
_remove_node(&heads[size_bits + 1], node);
left->parent = right->parent = node;
left->sibling = right;
left->origin_head = &heads[size_bits];
right->origin_head = &heads[size_bits];
right->sibling = left;
if (node->paddr != ALLOCMAN_NO_PADDR) {
left->paddr = node->paddr;
right->paddr = node->paddr + BIT(size_bits);
} else {
left->paddr = right->paddr = ALLOCMAN_NO_PADDR;
}
/* insert in this order so that we end up pulling the untypeds off in order of contiugous
* physical address. This makes various allocation problems slightly less likely to happen */
_insert_node(&heads[size_bits], right);
_insert_node(&heads[size_bits], left);
return 0;
}
static int _refill_pool(allocman_t *alloc, utspace_split_t *split, uint32_t size_bits) {
struct utspace_split_node *node;
struct utspace_split_node *left, *right;
int sel4_error;
/* see if pool is actually empty */
if (split->heads[size_bits]) {
return 0;
}
/* ensure we are not the highest pool */
if (size_bits >= 30) {
/* bugger, no untypeds bigger than us */
return 1;
}
/* get something from the highest pool */
if (_refill_pool(alloc, split, size_bits + 1)) {
/* could not fill higher pool */
return 1;
}
/* use the first node for lack of a better one */
node = split->heads[size_bits + 1];
/* allocate two new nodes */
left = _new_node(alloc);
if (!left) {
return 1;
}
right = _new_node(alloc);
if (!right) {
_delete_node(alloc, left);
return 1;
}
/* perform the first retype */
#if defined(CONFIG_KERNEL_STABLE)
sel4_error = seL4_Untyped_RetypeAtOffset(node->ut.capPtr, seL4_UntypedObject, 0, size_bits, left->ut.root, left->ut.dest, left->ut.destDepth, left->ut.offset, 1);
#else
sel4_error = seL4_Untyped_Retype(node->ut.capPtr, seL4_UntypedObject, size_bits, left->ut.root, left->ut.dest, left->ut.destDepth, left->ut.offset, 1);
#endif
if (sel4_error != seL4_NoError) {
_delete_node(alloc, left);
_delete_node(alloc, right);
/* Well this shouldn't happen */
return 1;
}
/* perform the second retype */
#if defined(CONFIG_KERNEL_STABLE)
sel4_error = seL4_Untyped_RetypeAtOffset(node->ut.capPtr, seL4_UntypedObject, BIT(size_bits), size_bits, right->ut.root, right->ut.dest, right->ut.destDepth, right->ut.offset, 1);
#else
sel4_error = seL4_Untyped_Retype(node->ut.capPtr, seL4_UntypedObject, size_bits, right->ut.root, right->ut.dest, right->ut.destDepth, right->ut.offset, 1);
#endif
if (sel4_error != seL4_NoError) {
vka_cnode_delete(&left->ut);
_delete_node(alloc, left);
_delete_node(alloc, right);
/* Well this shouldn't happen */
return 1;
}
/* all is done. remove the parent and insert the children */
_remove_node(&split->heads[size_bits + 1], node);
left->parent = right->parent = node;
left->sibling = right;
right->sibling = left;
if (node->paddr) {
left->paddr = node->paddr;
right->paddr = node->paddr + BIT(size_bits);
} else {
left->paddr = right->paddr = 0;
}
/* insert in this order so that we end up pulling the untypeds off in order of contiugous
* physical address. This makes various allocation problems slightly less likely to happen */
_insert_node(&split->heads[size_bits], right);
_insert_node(&split->heads[size_bits], left);
return 0;
}
