Add ata driver

Enable the kernel to read from an ATA device

Signed-off-by: Carlos Maiolino <[email protected]>

1 files changed, 34 insertions, 0 deletions

diff --git a/src/drivers/ata.c b/src/drivers/ata.c
new file mode 100644
index 0000000..82df0e3
--- /dev/null
+++ b/src/drivers/ata.c
@@ -0,0 +1,34 @@
+#include <toxic/io.h>
+
+int
+ata_read_sector(
+	int lba,
+	int total,
+	void *buf)
+{
+	int i, j;
+	unsigned short *ptr; /* Get 2 bytes at a time from the controller */
+
+	outb(0x1F6, (lba >> 24) | 0xE0);
+	outb(0x1F2, total);
+	outb(0x1F3, (unsigned char)(lba & 0xff));
+	outb(0x1F4, (unsigned char)(lba >> 8));
+	outb(0x1F5, (unsigned char)(lba >> 16));
+	outb(0x1F7, 0x20);
+
+	ptr = (unsigned short *)buf;
+
+	for (i = 0; i < total; i++) {
+		char c = insb(0x1F7);
+		/* This should be implemented in interrupts */
+		while (!(c & 0x08))
+			c = insb(0x1F7);
+
+		for (j = 0; j < 256; j++) {
+			*ptr = insw(0x1F0);
+			ptr++;
+		}
+	}
+
+	return 0;
+}