From 2c856e2fdd88330fe347aece88156749a1fdec33 Mon Sep 17 00:00:00 2001
From: "Marat Zakiyanov (Mario79)" <mario79@bk.ru>
Date: Mon, 30 Jul 2007 20:17:22 +0000
Subject: [PATCH] Fix: clear DMA read precache, when the physical device IDE
 varies.

git-svn-id: svn://kolibrios.org@597 a494cfbc-eb01-0410-851d-a64ba20cac60
---
 kernel/trunk/blkdev/hd_drv.inc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/trunk/blkdev/hd_drv.inc b/kernel/trunk/blkdev/hd_drv.inc
index 2e6ad22e3e..79053110f2 100644
--- a/kernel/trunk/blkdev/hd_drv.inc
+++ b/kernel/trunk/blkdev/hd_drv.inc
@@ -477,6 +477,7 @@ IDE_descriptor_table:
         dw      0x8000
 
 dma_cur_sector  dd      not 40h
+dma_hdpos       dd      0
 irq14_func      dd      hdd_irq_null
 irq15_func      dd      hdd_irq_null
 endg
@@ -557,6 +558,9 @@ align 4
 hd_read_dma:
         push    eax
         push    edx
+        mov     edx,[dma_hdpos]
+        cmp     edx,[hdpos]
+        jne     .notread
         mov     edx, [dma_cur_sector]
         cmp     eax, edx
         jb      .notread
@@ -659,6 +663,8 @@ hd_read_dma:
 @@:
         cmp     [hd_error], 0
         jnz     hd_read_error
+        mov     eax,[hdpos]
+        mov     [dma_hdpos],eax
         pop     edx
         pop     eax
         mov     [dma_cur_sector], eax