Add ata driver

Enable the kernel to read from an ATA device

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

3 files changed, 44 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 8bebd54..365b7b9 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ KOBJ_FILES = $(KERNEL_ASM_OBJ) \
 	     ./build/mm/kernel_heap.o \
 	     ./build/mm/paging.asm.o \
 	     ./build/mm/paging.o \
+	     ./build/drivers/ata.o
 
 
 BOOT_TGT =./bin/boot.bin
@@ -79,6 +80,10 @@ $(BUILD_DIR)/mm/paging.asm.o: ./src/mm/paging.asm
 
 $(BUILD_DIR)/mm/paging.o: ./src/mm/paging.c
 	i686-elf-gcc $(INCLUDES) $(FLAGS) -std=gnu99 -c ./src/mm/paging.c -o $(BUILD_DIR)/mm/paging.o
+
+$(BUILD_DIR)/drivers/ata.o: ./src/drivers/ata.c
+	i686-elf-gcc $(INCLUDES) $(FLAGS) -std=gnu99 -c ./src/drivers/ata.c -o $(BUILD_DIR)/drivers/ata.o
+
 clean:
 	rm -f $(BOOT_TGT)
 	rm -f bin/kernel.bin
@@ -91,4 +96,5 @@ clean:
 	rm -f build/idt/idt.o
 	rm -f build/io/io.asm.o
 	rm -f build/mm/*.o
+	rm -f build/drivers/*.o
 	rm -f bin/os.bin
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;
+}
diff --git a/src/kernel.c b/src/kernel.c
index 01de04f..d917bd8 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -7,11 +7,14 @@
 #include <toxic/io.h>
 #include <mm/kernel_heap.h>
 #include <mm/paging.h>
+#include <ata/ata.h>
 
 static struct page_directory *kernel_directory;
 
 void start_kernel()
 {
+	char buf[512] = {0};
+
 	init_display(2);
 	vprintl("Hello World!!!\n");
 	vprintl("Testing it!!!\n");
@@ -48,4 +51,5 @@ void start_kernel()
 
 	kfree(ptr);
 
+	ata_read_sector(0, 1, buf);
 }