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format buddy.c

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This commit is contained in:
KAAAsS 2021-05-12 22:57:07 +08:00
parent fd018168a9
commit a3e56b886e
Signed by: KAAAsS
GPG Key ID: D56625F3E671882F
1 changed files with 97 additions and 106 deletions
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33
lab2/kernel/mm/buddy.c
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@ -11,8 +11,7 @@
* The usable memory: [pool_start_addr, pool_start_addr + pool_mem_size). * The usable memory: [pool_start_addr, pool_start_addr + pool_mem_size).
*/ */
void init_buddy(struct phys_mem_pool *pool, struct page *start_page, void init_buddy(struct phys_mem_pool *pool, struct page *start_page,
vaddr_t start_addr, u64 page_num) vaddr_t start_addr, u64 page_num) {
{
int order; int order;
int page_idx; int page_idx;
struct page *page; struct page *page;
@ -31,7 +30,7 @@ void init_buddy(struct phys_mem_pool *pool, struct page *start_page,
} }
/* Clear the page_metadata area. */ /* Clear the page_metadata area. */
memset((char *)start_page, 0, page_num * sizeof(struct page)); memset((char *) start_page, 0, page_num * sizeof(struct page));
/* Init the page_metadata area. */ /* Init the page_metadata area. */
for (page_idx = 0; page_idx < page_num; ++page_idx) { for (page_idx = 0; page_idx < page_num; ++page_idx) {
@ -48,8 +47,7 @@ void init_buddy(struct phys_mem_pool *pool, struct page *start_page,
} }
static struct page *get_buddy_chunk(struct phys_mem_pool *pool, static struct page *get_buddy_chunk(struct phys_mem_pool *pool,
struct page *chunk) struct page *chunk) {
{
u64 chunk_addr; u64 chunk_addr;
u64 buddy_chunk_addr; u64 buddy_chunk_addr;
int order; int order;
@ -72,7 +70,7 @@ static struct page *get_buddy_chunk(struct phys_mem_pool *pool,
return NULL; return NULL;
} }
return virt_to_page(pool, (void *)buddy_chunk_addr); return virt_to_page(pool, (void *) buddy_chunk_addr);
} }
/* /*
@ -87,8 +85,7 @@ static struct page *get_buddy_chunk(struct phys_mem_pool *pool,
* smaller sub-pages. * smaller sub-pages.
*/ */
static struct page *split_page(struct phys_mem_pool *pool, u64 order, static struct page *split_page(struct phys_mem_pool *pool, u64 order,
struct page *page) struct page *page) {
{
// <lab2> // <lab2>
struct page *split_page = NULL; struct page *split_page = NULL;
return split_page; return split_page;
@ -103,8 +100,7 @@ static struct page *split_page(struct phys_mem_pool *pool, u64 order,
* Hints: Find the corresonding free_list which can allocate 1<<order * Hints: Find the corresonding free_list which can allocate 1<<order
* continuous pages and don't forget to split the list node after allocation * continuous pages and don't forget to split the list node after allocation
*/ */
struct page *buddy_get_pages(struct phys_mem_pool *pool, u64 order) struct page *buddy_get_pages(struct phys_mem_pool *pool, u64 order) {
{
// <lab2> // <lab2>
struct page *page = NULL; struct page *page = NULL;
@ -121,8 +117,7 @@ struct page *buddy_get_pages(struct phys_mem_pool *pool, u64 order)
* there is not corresponding buddy page. get_buddy_chunk * there is not corresponding buddy page. get_buddy_chunk
* is helpful in this function. * is helpful in this function.
*/ */
static struct page *merge_page(struct phys_mem_pool *pool, struct page *page) static struct page *merge_page(struct phys_mem_pool *pool, struct page *page) {
{
// <lab2> // <lab2>
struct page *merge_page = NULL; struct page *merge_page = NULL;
@ -137,25 +132,22 @@ static struct page *merge_page(struct phys_mem_pool *pool, struct page *page)
* *
* Hints: you can invoke merge_page. * Hints: you can invoke merge_page.
*/ */
void buddy_free_pages(struct phys_mem_pool *pool, struct page *page) void buddy_free_pages(struct phys_mem_pool *pool, struct page *page) {
{
// <lab2> // <lab2>
// </lab2> // </lab2>
} }
void *page_to_virt(struct phys_mem_pool *pool, struct page *page) void *page_to_virt(struct phys_mem_pool *pool, struct page *page) {
{
u64 addr; u64 addr;
/* page_idx * BUDDY_PAGE_SIZE + start_addr */ /* page_idx * BUDDY_PAGE_SIZE + start_addr */
addr = (page - pool->page_metadata) * BUDDY_PAGE_SIZE + addr = (page - pool->page_metadata) * BUDDY_PAGE_SIZE +
pool->pool_start_addr; pool->pool_start_addr;
return (void *)addr; return (void *) addr;
} }
struct page *virt_to_page(struct phys_mem_pool *pool, void *addr) struct page *virt_to_page(struct phys_mem_pool *pool, void *addr) {
{
struct page *page; struct page *page;
page = pool->page_metadata + page = pool->page_metadata +
@ -163,8 +155,7 @@ struct page *virt_to_page(struct phys_mem_pool *pool, void *addr)
return page; return page;
} }
u64 get_free_mem_size_from_buddy(struct phys_mem_pool * pool) u64 get_free_mem_size_from_buddy(struct phys_mem_pool *pool) {
{
int order; int order;
struct free_list *list; struct free_list *list;
u64 current_order_size; u64 current_order_size;