From 574d2cf63006cabbf9db4a80c55a407b5b33a700 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Thu, 7 Oct 2021 21:59:22 +0200
Subject: ATA: detect device type
---
src/kernel/arch/i386/ata.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
(limited to 'src/kernel/arch/i386')
diff --git a/src/kernel/arch/i386/ata.c b/src/kernel/arch/i386/ata.c
index e33b5af..4bc4293 100644
--- a/src/kernel/arch/i386/ata.c
+++ b/src/kernel/arch/i386/ata.c
@@ -5,6 +5,11 @@
#include <kernel/arch/io.h>
static struct {
+ enum {
+ DEV_UNKNOWN,
+ DEV_PATA,
+ DEV_PATAPI,
+ } type;
uint32_t sectors;
} ata_drives[4];
@@ -47,11 +52,19 @@ static bool ata_identify(int drive) {
if (v == 0) return false; // nonexistent drive
while (port_in8(iobase + STATUS) & 0x80);
- /* check for uncomformant devices, quit early */
- if (port_in8(iobase + LBAmid) || port_in8(iobase + LBAhi)) {
- // TODO atapi
- return true;
+ /* detect device type */
+ switch (port_in8(iobase + LBAmid)) {
+ case 0:
+ ata_drives[drive].type = DEV_PATA;
+ break;
+ case 0x14:
+ ata_drives[drive].type = DEV_PATAPI;
+ return true;
+ default:
+ ata_drives[drive].type = DEV_UNKNOWN;
+ return false;
}
+
/* pool until bit 3 (DRQ) or 0 (ERR) is set */
while (!((v = port_in8(iobase + STATUS) & 0x9)));
if (v & 1) return false; /* ERR was set, bail */
--
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