2 /* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */
5 * Copyright (C) 2001 Benno Rice
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
30 * Copyright (C) 1995, 1996 TooLs GmbH.
31 * All rights reserved.
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
36 * 1. Redistributions of source code must retain the above copyright
37 * notice, this list of conditions and the following disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 * notice, this list of conditions and the following disclaimer in the
40 * documentation and/or other materials provided with the distribution.
41 * 3. All advertising materials mentioning features or use of this software
42 * must display the following acknowledgement:
43 * This product includes software developed by TooLs GmbH.
44 * 4. The name of TooLs GmbH may not be used to endorse or promote products
45 * derived from this software without specific prior written permission.
47 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
48 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
49 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
50 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
51 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
52 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
53 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
54 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
55 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
56 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 #include <sys/syscall.h>
63 #include <machine/trap.h>
64 #include <machine/param.h>
65 #include <machine/pmap.h>
66 #include <machine/psl.h>
67 #include <machine/asm.h>
71 * Find a runnable thread and switch to it.
75 mfsprg %r3,%r0 /* Get the globaldata pointer */
76 lwz %r4,GD_CURTHREAD(%r3) /* Get the current thread */
77 lwz %r3,TD_PCB(%r4) /* Get a pointer to the PCB */
79 stmw %r14,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
80 mfcr %r4 /* Save the condition register */
83 lwz %r29,PCB_FLAGS(%r3)
84 andi. %r9, %r29, 1 /* XXX - don't hard code */
86 mr %r29, %r3 /* Save the PCB pointer */
88 mr %r3, %r29 /* and restore it */
91 bl choosethread /* Find a new thread to run */
93 mr %r14,%r3 /* Save off the (struct thread *) */
95 bl pmap_activate /* Activate the new address space */
98 mfsprg %r4,%r0 /* Get the globaldata pointer */
99 stw %r14,GD_CURTHREAD(%r4) /* Store new current thread */
100 lwz %r4,TD_PCB(%r14) /* Grab the new PCB */
102 lwz %r29, PCB_FLAGS(%r4) /* Restore FPU regs if needed */
110 lmw %r14,PCB_CONTEXT(%r4) /* Load the non-volatile GP regs */
111 lwz %r5,PCB_CR(%r4) /* Load the condition register */
117 * Update pcb, saving current processor state
120 stmw %r14,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
121 mfcr %r4 /* Save the condition register */
122 stw %r4,PCB_CONTEXT(%r3)