Changeset 3e6ff9a in mainline for uspace/lib/usb/include/usb/dma_buffer.h

Timestamp:

2018-02-01T14:28:41Z (6 years ago)

Author:

Ondřej Hlavatý <aearsis@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

e67c50a

Parents:

77ded647

Message:

usb: dma_buffer check policy function

File:

• uspace/lib/usb/include/usb/dma_buffer.h (modified) (3 diffs)

uspace/lib/usb/include/usb/dma_buffer.h

@@ -32 +32 @@
  * @brief USB host controller library: DMA buffer helpers
  *
- * Simplifies usage of bounce buffers.
+ * Simplifies usage of bounce buffers
  *
  * Currently the minimum size allocated is a page, which is wasteful. Could be
@@ -46 +46 @@
 
 typedef const struct dma_policy {
-        bool use64;             /**< Whether to use more than initial 4GiB of memory */
-        size_t alignment;       /**< What alignment is needed. At most PAGE_SIZE. */
+        unsigned flags;
+
+#define DMA_POLICY_F_4GiB       (1<<0)  /**< Must use only 32-bit addresses */
+#define DMA_POLICY_F_CONTIGUOUS (1<<1)  /**< Pages must follow each other physically */
 } dma_policy_t;
 
@@ -56 +58 @@
 
 extern int dma_buffer_alloc(dma_buffer_t *db, size_t size);
-extern int dma_buffer_alloc_policy(dma_buffer_t *, size_t, const dma_policy_t *);
+extern int dma_buffer_alloc_policy(dma_buffer_t *, size_t, dma_policy_t *);
 extern void dma_buffer_free(dma_buffer_t *);
 extern uintptr_t dma_buffer_phys(const dma_buffer_t *, void *);
+
+extern bool dma_buffer_check_policy(const void *, size_t, dma_policy_t *);
 
 static inline int dma_buffer_is_set(dma_buffer_t *db)