72 lines
3.4 KiB
Plaintext
72 lines
3.4 KiB
Plaintext
----------------------------------------------------------------------
|
|
Patch name: patch.mini2-temp-fic
|
|
Author: cbothamy
|
|
Date: Wed Mar 5 11:32:00 MET 2003
|
|
Status: applied to cvs, available in case we want to revert it
|
|
|
|
Detailed description:
|
|
This patch fixes the non detection of the hard drives by minix2.
|
|
|
|
The problem lies in the fact that real hardware handles ata registers
|
|
even for non existing drives (ie non present slave drives).
|
|
Minix2 uses this fact to detect ata controller by writing to the
|
|
cylinder register of the slave drive, and reading it back.
|
|
Bochs was returning 0 when the slave wes not present.
|
|
|
|
The patch attempt to fix this, but I'm expecting side effects with
|
|
other OSes, so this patch can be used to revert to the previous state.
|
|
|
|
Patch was created with:
|
|
cvs diff -u
|
|
Apply patch to what version:
|
|
cvs checked out on Wed Mar 5 11:32:00 MET 2003
|
|
Instructions:
|
|
To patch, go to main bochs directory.
|
|
Type "patch -p0 < THIS_PATCH_FILE".
|
|
----------------------------------------------------------------------
|
|
Index: iodev/harddrv.cc
|
|
===================================================================
|
|
RCS file: /cvsroot/bochs/bochs/iodev/harddrv.cc,v
|
|
retrieving revision 1.96
|
|
diff -u -r1.96 harddrv.cc
|
|
--- iodev/harddrv.cc 2 Mar 2003 23:59:10 -0000 1.96
|
|
+++ iodev/harddrv.cc 5 Mar 2003 10:31:33 -0000
|
|
@@ -76,6 +76,7 @@
|
|
|
|
#define BX_MASTER_IS_PRESENT(c) BX_DRIVE_IS_PRESENT((c),0)
|
|
#define BX_SLAVE_IS_PRESENT(c) BX_DRIVE_IS_PRESENT((c),1)
|
|
+#define BX_ANY_IS_PRESENT(c) (BX_DRIVE_IS_PRESENT((c),0) || BX_DRIVE_IS_PRESENT((c),1))
|
|
|
|
#define BX_SELECTED_CONTROLLER(c) (BX_CONTROLLER((c),BX_HD_THIS channels[(c)].drive_select))
|
|
#define BX_SELECTED_DRIVE(c) (BX_DRIVE((c),BX_HD_THIS channels[(c)].drive_select))
|
|
@@ -974,11 +975,17 @@
|
|
case 0x03: // sector number 0x1f3
|
|
value8 = (!BX_SELECTED_IS_PRESENT(channel)) ? 0 : BX_SELECTED_CONTROLLER(channel).sector_no;
|
|
goto return_value8;
|
|
- case 0x04: // cylinder low 0x1f4
|
|
- value8 = (!BX_SELECTED_IS_PRESENT(channel)) ? 0 : (BX_SELECTED_CONTROLLER(channel).cylinder_no & 0x00ff);
|
|
+ case 0x04: // cylinder low 0x1f4
|
|
+ // -- WARNING : On real hardware the controller registers are shared between drives.
|
|
+ // So we must respond even if the select device is not present. Some OS uses this fact
|
|
+ // to detect the disks.... minix2 for example
|
|
+ value8 = (!BX_ANY_IS_PRESENT(channel)) ? 0 : (BX_SELECTED_CONTROLLER(channel).cylinder_no & 0x00ff);
|
|
goto return_value8;
|
|
case 0x05: // cylinder high 0x1f5
|
|
- value8 = (!BX_SELECTED_IS_PRESENT(channel)) ? 0 : BX_SELECTED_CONTROLLER(channel).cylinder_no >> 8;
|
|
+ // -- WARNING : On real hardware the controller registers are shared between drives.
|
|
+ // So we must respond even if the select device is not present. Some OS uses this fact
|
|
+ // to detect the disks.... minix2 for example
|
|
+ value8 = (!BX_ANY_IS_PRESENT(channel)) ? 0 : BX_SELECTED_CONTROLLER(channel).cylinder_no >> 8;
|
|
goto return_value8;
|
|
|
|
case 0x06: // hard disk drive and head register 0x1f6
|
|
@@ -1000,7 +1007,7 @@
|
|
|
|
case 0x07: // Hard Disk Status 0x1f7
|
|
case 0x16: // Hard Disk Alternate Status 0x3f6
|
|
- if (!BX_SELECTED_IS_PRESENT(channel)) {
|
|
+ if (!BX_ANY_IS_PRESENT(channel)) {
|
|
// (mch) Just return zero for these registers
|
|
value8 = 0;
|
|
} else {
|