feat: serial device interfacing

[lunaix-os.git] / lunaix-os / hal / char / devzero.c

diff --git a/lunaix-os/hal/char/devzero.c b/lunaix-os/hal/char/devzero.c
new file mode 100644 (file)
index 0000000..d5f13c6
--- /dev/null
+++ b/lunaix-os/hal/char/devzero.c
@@ -0,0 +1,35 @@
+#include <lunaix/device.h>
+#include <lunaix/mm/page.h>
+
+#include <klibc/string.h>
+
+static int
+__zero_rd_pg(struct device* dev, void* buf, size_t offset)
+{
+    memset(&((u8_t*)buf)[offset], 0, PG_SIZE);
+    return PG_SIZE;
+}
+
+static int
+__zero_rd(struct device* dev, void* buf, size_t offset, size_t len)
+{
+    memset(&((u8_t*)buf)[offset], 0, len);
+    return len;
+}
+
+static int
+pdev_zerodev_init(struct device_def*)
+{
+    struct device* devzero = device_addseq(NULL, NULL, "zero");
+    devzero->ops.read_page = __zero_rd_pg;
+    devzero->ops.read = __zero_rd;
+
+    return 0;
+}
+
+static struct device_def devzero_def = {
+    .name = "zero",
+    .class = DEVCLASS(DEVIF_NON, DEVFN_PSEUDO, DEV_BUILTIN, 1),
+    .init = pdev_zerodev_init
+};
+EXPORT_DEVICE(zerodev, &devzero_def, load_earlystage);