starting on ata

2 files changed, 37 insertions, 0 deletions

diff --git a/kernel/drivers/ata.c b/kernel/drivers/ata.c
new file mode 100644
index 0000000..4c5896c
--- /dev/null
+++ b/kernel/drivers/ata.c
@@ -0,0 +1,37 @@
+// taken from https://wiki.osdev.org/PCI#Class_Codes
+#define CLASS_MASS_STORAGE_CONTROLLER 0x1
+
+#define SUBCLASS_SCSI_BUS_CONTROLLER 0x0
+#define SUBCLASS_IDE_CONTROLLER 0x1
+#define SUBCLASS_FLOPPY_DISK_CONTROLLER 0x2
+#define SUBCLASS_IPI_BUS_CONTROLLER 0x3
+#define SUBCLASS_RAID_CONTROLLER 0x4
+#define SUBCLASS_ATA_CONTROLLER 0x5
+#define SUBCLASS_SERIAL_ATA_CONTROLLER 0x6
+#define SUBCLASS_SERIAL_ATTACHED_SCSI_CONTROLLER 0x7
+#define SUBCLASS_NON_VOLATILE_MEMORY_CONTROLLER 0x8
+#define SUBCLASS_OTHER 0x80
+
+// from https://wiki.osdev.org/PCI_IDE_Controller#Detecting_a_PCI_IDE_Controller
+#define IDE_PROG_IF_PRIMARY_CHANNEL_IS_PCI_NATIVE_FLAG 0x1
+#define IDE_PROG_IF_PRIMARY_CHANNEL_CAN_SWITCH_TO_AND_FROM_PCI_NATIVE_FLAG 0x2
+#define IDE_PROG_IF_SECONDARY_CHANNEL_IS_PCI_NATIVE_FLAG 0x3
+#define IDE_PROG_IF_SECONDARY_CHANNEL_CAN_SWITCH_TO_AND_FROM_PCI_NATIVE_FLAG 0x4
+#define IDE_PROG_IF_DMA_SUPPORT_FLAG 0x7
+
+#include "comus/drivers/pci.h"
+#include "comus/drivers/ata.h"
+
+bool ata_find_primary_drive(struct pci_device *out)
+{
+	if (!pci_findby_class(out, CLASS_MASS_STORAGE_CONTROLLER,
+							SUBCLASS_IDE_CONTROLLER, NULL)) {
+        return false;
+    }
+
+    const uint8_t prog_if = pci_rcfg_b(*out, PCI_PROG_IF_B);
+
+    return true;
+}
+
+
diff --git a/kernel/include/comus/drivers/ata.h b/kernel/include/comus/drivers/ata.h
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/kernel/include/comus/drivers/ata.h