Changeset b994a60 in mainline for arch/ia64/src/asm.S

Timestamp:

2006-03-09T12:44:27Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

901122b

Parents:

cd373bb

Message:

ia64 work.
Changes to make userspace work (kernel part).
Use ski.conf from contrib directory to run Ski.

There is actually no appropriate syscall handler yet.

File:

• arch/ia64/src/asm.S (modified) (2 diffs)

arch/ia64/src/asm.S

@@ -27 +27 @@
 #
 
+#include <arch/register.h>
+
 .text
 
@@ -47 +49 @@
         }
         br halt
+
+/** Switch to userspace - low level code.
+ *
+ * @param in0 Userspace entry point address.
+ * @param in1 Userspace stack pointer address.
+ * @param in2 Userspace register stack pointer address.
+ * @param in3 Value to be stored in IPSR.
+ * @param in4 Value to be stored in RSC.
+ */
+.global switch_to_userspace
+switch_to_userspace:
+        alloc loc0 = ar.pfs, 5, 3, 0, 0
+        rsm (PSR_IC_MASK | PSR_I_MASK)          /* disable interruption collection  and interrupts */
+        srlz.d ;;
+        srlz.i ;;
+        
+        mov cr.ipsr = in3
+        mov cr.iip = in0
+        mov r12 = in1
+
+        xor r1 = r1, r1
+        
+        mov loc1 = cr.ifs
+        movl loc2 = PFM_MASK ;;
+        and loc1 = loc2, loc1 ;;
+        mov cr.ifs = loc1 ;;                    /* prevent decrementing BSP by rfi */
+
+        invala
+        
+        mov loc1 = ar.rsc ;;
+        and loc1 = ~3, loc1 ;;                  
+        mov ar.rsc = loc1 ;;                    /* put RSE into enforced lazy mode */
+
+        flushrs ;;
+        
+        mov ar.bspstore = in2 ;;
+        mov ar.rsc = in4 ;;
+        
+        rfi ;;