From fa082df2da6b3be52c66ce0d48c209a3df38115d Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sun, 14 Aug 2022 21:18:01 +0200
Subject: kernel/ata: "proper" read support

---
 src/kernel/arch/amd64/ata.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'src/kernel/arch/amd64/ata.c')

diff --git a/src/kernel/arch/amd64/ata.c b/src/kernel/arch/amd64/ata.c
index 5c5fc57..d88f890 100644
--- a/src/kernel/arch/amd64/ata.c
+++ b/src/kernel/arch/amd64/ata.c
@@ -23,8 +23,6 @@ enum {
 	CMD    = 7,
 	STATUS = 7,
 
-	/* note: the OSDev wiki uses a different base port for the control port
-	 *       however i can just use this offset and stuff will just work tm */
 	CTRL   = 0x206,
 }; // offsets
 
@@ -40,11 +38,11 @@ static void ata_400ns(void) {
 		port_in8(base + STATUS);
 }
 
-static void ata_driveselect(int drive, int block) {
+static void ata_driveselect(int drive, int lba) {
 	uint8_t v = 0xE0;
 	if (drive&1) // slave?
 		v |= 0x10; // set drive number bit
-	// TODO account for block
+	v |= (lba >> 24) & 0xf;
 	port_out8(ata_iobase(drive) + DRV, v);
 }
 
@@ -124,6 +122,10 @@ bool ata_available(int drive) {
 	return ata_drives[drive].type != DEV_UNKNOWN;
 }
 
+size_t ata_size(int drive) {
+	return ata_drives[drive].sectors * ATA_SECTOR;
+}
+
 int ata_read(int drive, uint32_t lba, void *buf) {
 	if (ata_drives[drive].type != DEV_PATA)
 		panic_unimplemented();
-- 
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