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.
60 #include "opt_sched.h"
62 #include <sys/syscall.h>
64 #include <machine/trap.h>
65 #include <machine/param.h>
66 #include <machine/asm.h>
67 #include <machine/spr.h>
70 * void cpu_throw(struct thread *old, struct thread *new)
74 li %r14,0 /* Tell cpu_switchin not to release a thread */
79 * void cpu_switch(struct thread *old,
83 * Switch to a new thread saving the current state in the old thread.
86 lwz %r6,TD_PCB(%r3) /* Get the old thread's PCB ptr */
87 stmw %r12,PCB_CONTEXT(%r6) /* Save the non-volatile GP regs.
88 These can now be used for scratch */
90 mfcr %r16 /* Save the condition register */
92 mflr %r16 /* Save the link register */
94 stw %r1,PCB_SP(%r6) /* Save the stack pointer */
96 mr %r14,%r3 /* Copy the old thread ptr... */
97 mr %r2,%r4 /* and the new thread ptr in curthread */
98 mr %r16,%r5 /* and the new lock */
99 mr %r17,%r6 /* and the PCB */
101 lwz %r18,PCB_FLAGS(%r17)
102 /* Save FPU context if needed */
103 andi. %r7, %r18, PCB_FPU
108 mr %r3,%r14 /* restore old thread ptr */
109 /* Save Altivec context if needed */
110 andi. %r7, %r18, PCB_VEC
116 mfspr %r3,SPR_SPEFSCR
117 stw %r3,PCB_VSCR(%r17)
119 mr %r3,%r14 /* restore old thread ptr */
120 bl pmap_deactivate /* Deactivate the current pmap */
122 sync /* Make sure all of that finished */
125 #if defined(SMP) && defined(SCHED_ULE)
126 /* Wait for the new thread to become unblocked */
127 bl _GLOBAL_OFFSET_TABLE_@local-4
129 lwz %r6,blocked_lock@got(%r6)
137 lwz %r17,TD_PCB(%r2) /* Get new current PCB */
138 lwz %r1,PCB_SP(%r17) /* Load new stack pointer */
140 /* Release old thread now that we have a stack pointer set up */
143 stw %r16,TD_LOCK(%r14) /* ULE: update old thread's lock */
145 1: mfsprg %r7,0 /* Get the pcpu pointer */
146 stw %r2,PC_CURTHREAD(%r7) /* Store new current thread */
147 lwz %r17,TD_PCB(%r2) /* Store new current PCB */
148 stw %r17,PC_CURPCB(%r7)
150 mr %r3,%r2 /* Get new thread ptr */
151 bl pmap_activate /* Activate the new address space */
153 lwz %r19, PCB_FLAGS(%r17)
154 /* Restore FPU context if needed */
155 andi. %r6, %r19, PCB_FPU
157 mr %r3,%r2 /* Pass curthread to enable_fpu */
161 /* Restore Altivec context if needed */
162 andi. %r6, %r19, PCB_VEC
164 mr %r3,%r2 /* Pass curthread to enable_vec */
169 lwz %r3,PCB_VSCR(%r17)
170 mtspr SPR_SPEFSCR,%r3
172 /* thread to restore is in r3 */
173 mr %r3,%r17 /* Recover PCB ptr */
174 lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */
175 lwz %r5,PCB_CR(%r3) /* Load the condition register */
177 lwz %r5,PCB_LR(%r3) /* Load the link register */
179 lwz %r1,PCB_SP(%r3) /* Load the stack pointer */
181 * Perform a dummy stwcx. to clear any reservations we may have
182 * inherited from the previous thread. It doesn't matter if the
183 * stwcx succeeds or not. pcb_context[0] can be clobbered.
190 * Update pcb, saving current processor state
193 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
194 mfcr %r4 /* Save the condition register */
196 stw %r1,PCB_SP(%r3) /* Save the stack pointer */
197 mflr %r4 /* Save the link register */
203 * Set up the return from cpu_fork()
205 ENTRY(fork_trampoline)
210 addi %r1,%r1,CF_SIZE-FSP /* Allow 8 bytes in front of
211 trapframe to simulate FRAME_SETUP
212 does when allocating space for
213 a frame pointer/saved LR */
215 li %r3,SPEFSCR_FINVE|SPEFSCR_FDBZE|SPEFSCR_FUNFE|SPEFSCR_FOVFE
216 mtspr SPR_SPEFSCR, %r3