Changeset 2382d09 in mainline for arch/ia32/src/interrupt.c

Timestamp:

2006-04-29T15:01:41Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

407862e

Parents:

69a5600

Message:

Improve SYS_IOSPACE_ENABLE support.
The general protection fault handler now contains
code to service early I/O Permission bitmap faults.

File:

• arch/ia32/src/interrupt.c (modified) (2 diffs)

arch/ia32/src/interrupt.c

@@ -41 +41 @@
 #include <symtab.h>
 #include <proc/thread.h>
+#include <proc/task.h>
+#include <synch/spinlock.h>
+#include <arch/ddi/ddi.h>
 
 /*
@@ -79 +82 @@
 }
 
+/** General Protection Fault. */
 void gp_fault(int n, istate_t *istate)
 {
+        if (TASK) {
+                count_t ver;
+                
+                spinlock_lock(&TASK->lock);
+                ver = TASK->arch.iomapver;
+                spinlock_unlock(&TASK->lock);
+        
+                if (CPU->arch.iomapver_copy != ver) {
+                        /*
+                         * This fault can be caused by an early access
+                         * to I/O port because of an out-dated
+                         * I/O Permission bitmap installed on CPU.
+                         * Install the fresh copy and restart
+                         * the instruction.
+                         */
+                        io_perm_bitmap_install();
+                        return;
+                }
+        }
+
         PRINT_INFO_ERRCODE(istate);
         panic("general protection fault\n");