Simple IPC with pipes

kernel/ipc/pipe/pipe.c

@@ -0,0 +1,47 @@
+#include <stdint.h>
+#include <stddef.h>
+#include "rbuf/rbuf.h"
+#include "spinlock/spinlock.h"
+#include "hal/hal.h"
+#include "dlmalloc/malloc.h"
+#include "errors.h"
+#include "pipe.h"
+
+int32_t ipc_pipeinit(IpcPipe *pipe) {
+  hal_memset(pipe, 0, sizeof(*pipe));
+  spinlock_init(&pipe->spinlock);
+  pipe->rbuf.buffer = dlmalloc(IPC_PIPE_MAX);
+  if (pipe->rbuf.buffer == NULL) {
+    return E_NOMEMORY;
+  }
+  pipe->rbuf.cap = IPC_PIPE_MAX;
+  return E_OK;
+}
+
+void ipc_pipefree(IpcPipe *pipe) {
+  dlfree(pipe->rbuf.buffer);
+}
+
+int32_t ipc_pipewrite(IpcPipe *pipe, const uint8_t *const buffer, size_t n) {
+  size_t i = 0;
+  spinlock_acquire(&pipe->spinlock);
+  for (; i < n; i++) {
+    if (rbuf_push(&pipe->rbuf, buffer[i]) < 0) {
+      break;
+    }
+  }
+  spinlock_release(&pipe->spinlock);
+  return i;
+}
+
+int32_t ipc_piperead(IpcPipe *pipe, uint8_t *const buffer, size_t n) {
+  size_t i = 0;
+  spinlock_acquire(&pipe->spinlock);
+  for (; i < n; i++) {
+    if (rbuf_pop(&pipe->rbuf, &buffer[i]) < 0) {
+      break;
+    }
+  }
+  spinlock_release(&pipe->spinlock);
+  return i;
+}

kernel/ipc/pipe/pipe.h

@@ -0,0 +1,21 @@
+#ifndef IPC_PIPE_PIPE_H_
+#define IPC_PIPE_PIPE_H_
+
+#include <stdint.h>
+#include <stddef.h>
+#include "rbuf/rbuf.h"
+#include "spinlock/spinlock.h"
+
+#define IPC_PIPE_MAX 0x1000
+
+typedef struct {
+  RBuf rbuf;
+  SpinLock spinlock;
+} IpcPipe;
+
+int32_t ipc_pipeinit(IpcPipe *pipe);
+void ipc_pipefree(IpcPipe *pipe);
+int32_t ipc_pipewrite(IpcPipe *pipe, const uint8_t *const buffer, size_t n);
+int32_t ipc_piperead(IpcPipe *pipe, uint8_t *const buffer, size_t n);
+
+#endif // IPC_PIPE_PIPE_H_