Changeset bae9e76 in mainline

Timestamp:

2011-01-25T18:09:20Z (14 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

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

Children:

d5f7a8ab

Parents:

643b983

Message:

Use uint32_t and cpp flags intead of bit structure for link_pointer_t

Location:

uspace/drv/uhci/uhci_struct

Files:

• link_pointer.h (modified) (1 diff)
• queue_head.h (modified) (2 diffs)

uspace/drv/uhci/uhci_struct/link_pointer.h

@@ -36 +36 @@
 
 /* UHCI link pointer, used by many data structures */
-typedef struct link_pointer {
-        uint32_t addr:28;
-        uint8_t zero:1;
-        uint8_t reserved:1;
-        uint8_t qh:1;
-        uint8_t terminate:1;
-} __attribute__((packed)) link_pointer_t;
+typedef uint32_t link_pointer_t;
+
+#define LINK_POINTER_TERMINATE_FLAG (1 << 0);
+#define LINK_POINTER_QUEUE_HEAD_FLAG (1 << 1);
+#define LINK_POINTER_ZERO_BIT_FLAG (1 << 2);
+#define LINK_POINTER_RESERVED_FLAG (1 << 3);
+
+#define LINK_POINTER_ADDRESS_MASK 0xfffffff0 /* upper 28 bits */
 
 #endif

uspace/drv/uhci/uhci_struct/queue_head.h

@@ -38 +38 @@
 #include <assert.h>
 
-#include "translating_malloc.h"
 #include "link_pointer.h"
 
@@ -46 +45 @@
 } __attribute__((packed)) queue_head_t;
 
-static inline void queue_head_init(queue_head_t *instance, uint32_t next_pa)
+static inline void queue_head_init(queue_head_t *instance, uint32_t next_queue_pa)
 {
         assert(instance);
-        assert((next_pa & 0xf) == 0);
+        assert((next_queue_pa & LINK_POINTER_ADDRESS_MASK) == next_queue_pa);
 
-        memset(instance, 0, sizeof(*instance));
-        instance->element.terminate = 1;
-        if (next_pa) {
-                instance->next_queue.terminate = 0;
-                instance->next_queue.addr = next_pa >> 4;
+        instance->element = 0 | LINK_POINTER_TERMINATE_FLAG;
+        if (next_queue_pa) {
+                instance->next_queue = (next_queue_pa & LINK_POINTER_ADDRESS_MASK)
+                  | LINK_POINTER_QUEUE_HEAD_FLAG;
         } else {
-                instance->element.terminate = 1;
+                instance->next_queue = 0 | LINK_POINTER_TERMINATE_FLAG;
         }
 }