Add locked ring buffer

core/ringbuffer.c

@@ -1,6 +1,7 @@
 #include "alloc.h"
 #include "klibc.h"
 #include "ringbuffer.h"
+#include "synchro.h"
 
 struct ringbuffer_instance_t {
     int32_t wr_pos;
@@ -13,7 +14,13 @@ struct ringbuffer_instance_t {
 ringbuffer_t ringbufferCreate(uint32_t capacity)
 {
     ringbuffer_t inst = zalloc(1 * sizeof(struct ringbuffer_instance_t));
+    if (inst == NULL)
+        return NULL;
     inst->data = zalloc(capacity * sizeof(uint8_t));
+    if (inst->data == NULL) {
+        free(inst);
+        return NULL;
+    }
     inst->capacity = capacity;
     inst->wr_pos   = 0;
     inst->rd_pos   = 0;
@@ -35,19 +42,19 @@ uint32_t ringbufferUsed(ringbuffer_t instance)
     return (instance->wr_pos - instance->rd_pos) % instance->capacity;
 }
 
-bool_t ringbufferEmpty(ringbuffer_t instance)
+bool_t ringbufferIsEmpty(ringbuffer_t instance)
 {
     return (!instance->full && (instance->wr_pos == instance->rd_pos));
 }
 
-bool_t ringbufferFull(ringbuffer_t instance)
+bool_t ringbufferIsFull(ringbuffer_t instance)
 {
     return instance->full;
 }
 
 bool_t ringbufferEnqueue(ringbuffer_t instance, uint8_t item)
 {
-    if (ringbufferFull(instance))
+    if (ringbufferIsFull(instance))
         return FALSE;
 
     instance->data[instance->wr_pos] = item;
@@ -60,7 +67,7 @@ bool_t ringbufferEnqueue(ringbuffer_t instance, uint8_t item)
 
 bool_t ringbufferDequeue(ringbuffer_t instance, uint8_t *item)
 {
-    if (ringbufferEmpty(instance))
+    if (ringbufferIsEmpty(instance))
         return FALSE;
 
     instance->full   = FALSE;
@@ -85,3 +92,93 @@ void ringbufferDebug(ringbuffer_t instance)
     printf("%d/%d %d %d %s\n", ringbufferUsed(instance), ringbufferCapacity(instance),
            instance->wr_pos, instance->rd_pos, instance->full ? "(full)" : "");
 }
+
+struct locked_ringbuffer_instance_t {
+        struct ringbuffer_instance_t *ring;
+        struct mutex mut;
+};
+
+locked_ringbuffer_t lringbufferCreate(uint32_t capacity)
+{
+    locked_ringbuffer_t inst = zalloc(sizeof(locked_ringbuffer_t));
+    if (inst == NULL)
+        return NULL;
+
+    inst->ring = ringbufferCreate(capacity);
+    if (inst->ring == NULL) {
+        free(inst);
+        return NULL;
+    }
+
+    mutexInit(&inst->mut);
+
+    return inst;
+}
+
+uint32_t lringbufferCapacity(locked_ringbuffer_t instance)
+{
+    return instance->ring->capacity;
+}
+
+uint32_t lringbufferUsed(locked_ringbuffer_t instance)
+{
+    int used;
+    mutexLock(&instance->mut);
+    used = ringbufferUsed(instance->ring);
+    mutexUnlock(&instance->mut);
+    return used;
+}
+
+bool_t lringbufferEnqueue(locked_ringbuffer_t instance, uint8_t item)
+{
+    int ret;
+    mutexLock(&instance->mut);
+    ret = ringbufferEnqueue(instance->ring, item);
+    mutexUnlock(&instance->mut);
+
+    return ret;
+}
+
+bool_t lringbufferDequeue(locked_ringbuffer_t instance, uint8_t *item)
+{
+    int ret;
+    mutexLock(&instance->mut);
+    ret = ringbufferDequeue(instance->ring, item);
+    mutexUnlock(&instance->mut);
+
+    return ret;
+}
+
+void lringbufferDestroy(locked_ringbuffer_t instance){
+        mutexFree(&instance->mut);
+        ringbufferDestroy(instance->ring);
+        instance->ring = NULL;
+        free(instance);
+}
+
+void lringbufferDebug(locked_ringbuffer_t instance)
+{
+    mutexLock(&instance->mut);
+    ringbufferDebug(instance->ring);
+    mutexUnlock(&instance->mut);
+}
+
+bool_t lringbufferIsEmpty(locked_ringbuffer_t instance)
+{
+    bool_t ret;
+    mutexLock(&instance->mut);
+    ret = ringbufferIsEmpty(instance->ring);
+    mutexUnlock(&instance->mut);
+
+    return ret;
+}
+
+bool_t lringbufferIsFull(locked_ringbuffer_t instance)
+{
+    bool_t ret;
+    mutexLock(&instance->mut);
+    ret = ringbufferIsFull(instance->ring);
+    mutexUnlock(&instance->mut);
+
+    return ret;
+}

core/ringbuffer.h

@@ -1,6 +1,6 @@
 #pragma once
-
 #include "stdarg.h"
+#include "wait.h"
 
 typedef struct ringbuffer_instance_t *ringbuffer_t;
 
@@ -11,5 +11,17 @@ bool_t ringbufferEnqueue(ringbuffer_t instance, uint8_t item);
 bool_t ringbufferDequeue(ringbuffer_t instance, uint8_t *item);
 void ringbufferDestroy(ringbuffer_t instance);
 void ringbufferDebug(ringbuffer_t instance);
-bool_t ringbufferEmpty(ringbuffer_t instance);
-bool_t ringbufferFull(ringbuffer_t instance);
+bool_t ringbufferIsEmpty(ringbuffer_t instance);
+bool_t ringbufferIsFull(ringbuffer_t instance);
+
+typedef struct locked_ringbuffer_instance_t *locked_ringbuffer_t;
+
+locked_ringbuffer_t lringbufferCreate(uint32_t capacity);
+uint32_t lringbufferCapacity(locked_ringbuffer_t instance);
+uint32_t lringbufferUsed(locked_ringbuffer_t instance);
+bool_t lringbufferEnqueue(locked_ringbuffer_t instance, uint8_t item);
+bool_t lringbufferDequeue(locked_ringbuffer_t instance, uint8_t *item);
+void lringbufferDestroy(locked_ringbuffer_t instance);
+void lringbufferDebug(locked_ringbuffer_t instance);
+bool_t lringbufferIsEmpty(locked_ringbuffer_t instance);
+bool_t lringbufferIsFull(locked_ringbuffer_t instance);

core/uaccess.c

@@ -0,0 +1,52 @@
+#include "assert.h"
+#include "mmuContext.h"
+#include "paging.h"
+#include "thread.h"
+#include "uaccess.h"
+
+static int bindtoUserContext()
+{
+    struct thread *currentThread;
+    struct mmu_context *ctx;
+
+    currentThread = getCurrentThread();
+    assert(NULL != currentThread->process);
+
+    /* Switch to the user's address space */
+    ctx = processGetMMUContext(currentThread->process);
+    return threadChangeCurrentContext(ctx);
+}
+
+static int unbindUserContext()
+{
+    return threadChangeCurrentContext(NULL);
+}
+
+static int memcpyUserMemNoCheck(vaddr_t dest, vaddr_t src, size_t size)
+{
+
+    int ret;
+
+    ret = bindtoUserContext();
+    if (ret != 0)
+        return ret;
+
+    memcpy((void *)dest, (void *)src, size);
+
+    ret = unbindUserContext();
+    if (ret != 0)
+        return ret;
+
+    return size;
+}
+
+int memcpyFromUser(vaddr_t to, uaddr_t from, size_t size)
+{
+
+    if ((uint)from < PAGING_BASE_USER_ADDRESS)
+        return -EPERM;
+    if ((uint)from > PAGING_TOP_USER_ADDRESS - size)
+        return -EPERM;
+
+    return memcpyUserMemNoCheck(to, from, size);
+}

core/uaccess.h

@@ -0,0 +1,5 @@
+#pragma once
+#include "types.h"
+#include "stdarg.h"
+
+int memcpyFromUser(vaddr_t to, uaddr_t from, size_t size);