From: Andrew Schultz <alschult@umich.edu>
Date: Wed, 23 Jun 2004 19:37:05 +0000 (-0400)
Subject: Fix to properly shadow the DEV bit in the Drive/Head register so other
X-Git-Tag: m5_1.0_tutorial~294^2
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=06d8f0af5def68e395b58636d5e7d6ca69daa51f;p=gem5.git

Fix to properly shadow the DEV bit in the Drive/Head register so other
disks are properly detected and handled

--HG--
extra : convert_revision : ffc3046deb68458ee2ef6fa5263dc471488abc45
---

diff --git a/dev/ide_ctrl.cc b/dev/ide_ctrl.cc
index 46a0e8179..4805570d2 100644
--- a/dev/ide_ctrl.cc
+++ b/dev/ide_ctrl.cc
@@ -192,6 +192,22 @@ IdeController::getDisk(IdeDisk *diskPtr)
     return -1;
 }
 
+bool
+IdeController::isDiskSelected(IdeDisk *diskPtr)
+{
+    for (int i = 0; i < 4; i++) {
+        if ((long)diskPtr == (long)disks[i]) {
+            // is disk is on primary or secondary channel
+            int channel = i/2;
+            // is disk the master or slave
+            int devID = i%2;
+
+            return (dev[channel] == devID);
+        }
+    }
+    panic("Unable to find disk by pointer!!\n");
+}
+
 ////
 // Command completion
 ////
diff --git a/dev/ide_ctrl.hh b/dev/ide_ctrl.hh
index 679c7422b..39c64eb30 100644
--- a/dev/ide_ctrl.hh
+++ b/dev/ide_ctrl.hh
@@ -144,6 +144,10 @@ class IdeController : public PciDev
     /** Select the disk based on a pointer */
     int getDisk(IdeDisk *diskPtr);
 
+  public:
+    /** See if a disk is selected based on its pointer */
+    bool isDiskSelected(IdeDisk *diskPtr);
+
   public:
     /**
      * Constructs and initializes this controller.
diff --git a/dev/ide_disk.cc b/dev/ide_disk.cc
index 0f5c02660..ee21feaea 100644
--- a/dev/ide_disk.cc
+++ b/dev/ide_disk.cc
@@ -167,6 +167,12 @@ IdeDisk::reset(int id)
 // Utility functions
 ////
 
+bool
+IdeDisk::isDEVSelect()
+{
+    return ctrl->isDiskSelected(this);
+}
+
 Addr
 IdeDisk::pciToDma(Addr pciAddr)
 {
diff --git a/dev/ide_disk.hh b/dev/ide_disk.hh
index 409aaef9a..9c6eea623 100644
--- a/dev/ide_disk.hh
+++ b/dev/ide_disk.hh
@@ -320,7 +320,7 @@ class IdeDisk : public SimObject
     // Utility functions
     bool isBSYSet() { return (status & STATUS_BSY_BIT); }
     bool isIENSet() { return nIENBit; }
-    bool isDEVSelect() { return ((cmdReg.drive & SELECT_DEV_BIT) == devID); }
+    bool isDEVSelect();
 
     void setComplete()
     {