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-rw-r--r--util/Makefile.objs1
-rw-r--r--util/fifo8.c79
2 files changed, 80 insertions, 0 deletions
diff --git a/util/Makefile.objs b/util/Makefile.objs
index 495a178..cad5ce8 100644
--- a/util/Makefile.objs
+++ b/util/Makefile.objs
@@ -3,6 +3,7 @@ util-obj-$(CONFIG_WIN32) += oslib-win32.o qemu-thread-win32.o event_notifier-win
util-obj-$(CONFIG_POSIX) += oslib-posix.o qemu-thread-posix.o event_notifier-posix.o
util-obj-y += envlist.o path.o host-utils.o cache-utils.o module.o
util-obj-y += bitmap.o bitops.o hbitmap.o
+util-obj-y += fifo8.o
util-obj-y += acl.o
util-obj-y += error.o qemu-error.o
util-obj-$(CONFIG_POSIX) += compatfd.o
diff --git a/util/fifo8.c b/util/fifo8.c
new file mode 100644
index 0000000..013e903
--- /dev/null
+++ b/util/fifo8.c
@@ -0,0 +1,79 @@
+/*
+ * Generic FIFO component, implemented as a circular buffer.
+ *
+ * Copyright (c) 2012 Peter A. G. Crosthwaite
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu-common.h"
+#include "qemu/fifo8.h"
+
+void fifo8_create(Fifo8 *fifo, uint32_t capacity)
+{
+ fifo->data = g_new(uint8_t, capacity);
+ fifo->capacity = capacity;
+ fifo->head = 0;
+ fifo->num = 0;
+}
+
+void fifo8_destroy(Fifo8 *fifo)
+{
+ g_free(fifo->data);
+}
+
+void fifo8_push(Fifo8 *fifo, uint8_t data)
+{
+ if (fifo->num == fifo->capacity) {
+ abort();
+ }
+ fifo->data[(fifo->head + fifo->num) % fifo->capacity] = data;
+ fifo->num++;
+}
+
+uint8_t fifo8_pop(Fifo8 *fifo)
+{
+ uint8_t ret;
+
+ if (fifo->num == 0) {
+ abort();
+ }
+ ret = fifo->data[fifo->head++];
+ fifo->head %= fifo->capacity;
+ fifo->num--;
+ return ret;
+}
+
+void fifo8_reset(Fifo8 *fifo)
+{
+ fifo->num = 0;
+}
+
+bool fifo8_is_empty(Fifo8 *fifo)
+{
+ return (fifo->num == 0);
+}
+
+bool fifo8_is_full(Fifo8 *fifo)
+{
+ return (fifo->num == fifo->capacity);
+}
+
+const VMStateDescription vmstate_fifo8 = {
+ .name = "Fifo8",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_VBUFFER_UINT32(data, Fifo8, 1, NULL, 0, capacity),
+ VMSTATE_UINT32(head, Fifo8),
+ VMSTATE_UINT32(num, Fifo8),
+ VMSTATE_END_OF_LIST()
+ }
+};
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