xnu-792.24.17.tar.gz

[apple/xnu.git] / osfmk / i386 / cswitch.s

diff --git a/osfmk/i386/cswitch.s b/osfmk/i386/cswitch.s
index ca3cc863e37f9870c281dd5a3bb3045d560368a5..107bc26afb3ce82845eaf5f252a7dc7d1493576a 100644 (file)
--- a/osfmk/i386/cswitch.s
+++ b/osfmk/i386/cswitch.s
@@ -1,29 +1,23 @@
 /*
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *
 /*
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *

- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ * @APPLE_LICENSE_HEADER_START@

  * 
  * 

- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.

  * 
  * 

- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
- * 
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER

  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.

  * 
  * 

- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ * @APPLE_LICENSE_HEADER_END@

  */
 /*
  * @OSF_COPYRIGHT@
  */
 /*
  * @OSF_COPYRIGHT@


@@ -72,7 +66,6 @@
 
 #define        CX(addr, reg)   addr(,reg,4)
 
 
 #define        CX(addr, reg)   addr(,reg,4)
 

-       .text

 /*
  * Context switch routines for i386.
  */
 /*
  * Context switch routines for i386.
  */


@@ -93,27 +86,23 @@ Entry(Load_context)
        call    EXT(thread_continue)
 
 /*
        call    EXT(thread_continue)
 
 /*

- *     This has to save registers only
+ *     This really only has to save registers

  *     when there is no explicit continuation.
  */
 
 Entry(Switch_context)
  *     when there is no explicit continuation.
  */
 
 Entry(Switch_context)

-       popl    %eax                            /* pop return PC */
+       movl    %gs:CPU_ACTIVE_STACK,%ecx /* get old kernel stack */

 
 

-       /* Test for a continuation and skip all state saving if so... */
-       cmpl    $0,4(%esp)
-       jne     5f
-       movl    %gs:CPU_ACTIVE_STACK,%ecx       /* get old kernel stack */

        movl    %ebx,KSS_EBX(%ecx)              /* save registers */
        movl    %ebp,KSS_EBP(%ecx)
        movl    %edi,KSS_EDI(%ecx)
        movl    %esi,KSS_ESI(%ecx)
        movl    %ebx,KSS_EBX(%ecx)              /* save registers */
        movl    %ebp,KSS_EBP(%ecx)
        movl    %edi,KSS_EDI(%ecx)
        movl    %esi,KSS_ESI(%ecx)

-       movl    %eax,KSS_EIP(%ecx)              /* save return PC */
+       popl    KSS_EIP(%ecx)                   /* save return PC */

        movl    %esp,KSS_ESP(%ecx)              /* save SP */
        movl    %esp,KSS_ESP(%ecx)              /* save SP */

-5:
+

        movl    0(%esp),%eax                    /* return old thread */
        movl    8(%esp),%ebx                    /* get new thread */
        movl    0(%esp),%eax                    /* return old thread */
        movl    8(%esp),%ebx                    /* get new thread */

-       movl    %ebx,%gs:CPU_ACTIVE_THREAD      /* new thread is active */
+       movl    %ebx,%gs:CPU_ACTIVE_THREAD                /* new thread is active */

        movl    TH_KERNEL_STACK(%ebx),%ecx      /* get its kernel stack */
        lea     KERNEL_STACK_SIZE-IKS_SIZE-IEL_SIZE(%ecx),%ebx
                                                /* point to stack top */
        movl    TH_KERNEL_STACK(%ebx),%ecx      /* get its kernel stack */
        lea     KERNEL_STACK_SIZE-IKS_SIZE-IEL_SIZE(%ecx),%ebx
                                                /* point to stack top */


@@ -121,7 +110,9 @@ Entry(Switch_context)
        movl    %ecx,%gs:CPU_ACTIVE_STACK       /* set current stack */
        movl    %ebx,%gs:CPU_KERNEL_STACK       /* set stack top */
 
        movl    %ecx,%gs:CPU_ACTIVE_STACK       /* set current stack */
        movl    %ebx,%gs:CPU_KERNEL_STACK       /* set stack top */
 

-       
+
+       movl    $0,%gs:CPU_ACTIVE_KLOADED
+

        movl    KSS_ESP(%ecx),%esp              /* switch stacks */
        movl    KSS_ESI(%ecx),%esi              /* restore registers */
        movl    KSS_EDI(%ecx),%edi
        movl    KSS_ESP(%ecx),%esp              /* switch stacks */
        movl    KSS_ESI(%ecx),%esi              /* restore registers */
        movl    KSS_EDI(%ecx),%edi


@@ -135,17 +126,19 @@ Entry(Thread_continue)
        call    *%ebx                           /* call real continuation */
 
 /*
        call    *%ebx                           /* call real continuation */
 
 /*

- * thread_t Shutdown_context(thread_t thread,
- *                      void (*routine)(processor_t),
- *                      processor_t processor)
+ * void machine_processor_shutdown(thread_t thread,
+ *                                void (*routine)(processor_t),
+ *                                processor_t processor)

  *
  * saves the kernel context of the thread,
  * switches to the interrupt stack,
  * continues the thread (with thread_continue),
  * then runs routine on the interrupt stack.
  *
  *
  * saves the kernel context of the thread,
  * switches to the interrupt stack,
  * continues the thread (with thread_continue),
  * then runs routine on the interrupt stack.
  *

+ * Assumes that the thread is a kernel thread (thus
+ * has no FPU state)

  */
  */

-Entry(Shutdown_context)
+Entry(machine_processor_shutdown)

        movl    %gs:CPU_ACTIVE_STACK,%ecx /* get old kernel stack */
        movl    %ebx,KSS_EBX(%ecx)              /* save registers */
        movl    %ebp,KSS_EBP(%ecx)
        movl    %gs:CPU_ACTIVE_STACK,%ecx /* get old kernel stack */
        movl    %ebx,KSS_EBX(%ecx)              /* save registers */
        movl    %ebp,KSS_EBP(%ecx)


@@ -164,3 +157,10 @@ Entry(Shutdown_context)
        pushl   %esi                            /* push argument */
        call    *%ebx                           /* call routine to run */
        hlt                                     /* (should never return) */
        pushl   %esi                            /* push argument */
        call    *%ebx                           /* call routine to run */
        hlt                                     /* (should never return) */

+
+
+        .text
+
+       .globl  EXT(locore_end)
+LEXT(locore_end)
+