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/spr.h>
66 #include <machine/param.h>
67 #include <machine/asm.h>
73 TOC_ENTRY(blocked_lock)
76 * void cpu_throw(struct thread *old, struct thread *new)
80 li %r14,0 /* Tell cpu_switchin not to release a thread */
81 li %r18,0 /* No old pcb flags. The old thread is extinguished. */
86 * void cpu_switch(struct thread *old,
90 * Switch to a new thread saving the current state in the old thread.
92 * Internally clobbers (not visible outside of this file):
93 * r18 - old thread pcb_flags
94 * r19 - new thread pcb_flags
97 ld %r6,TD_PCB(%r3) /* Get the old thread's PCB ptr */
98 std %r12,PCB_CONTEXT(%r6) /* Save the non-volatile GP regs.
99 These can now be used for scratch */
100 std %r14,PCB_CONTEXT+2*8(%r6)
101 std %r15,PCB_CONTEXT+3*8(%r6)
102 std %r16,PCB_CONTEXT+4*8(%r6)
103 std %r17,PCB_CONTEXT+5*8(%r6)
104 std %r18,PCB_CONTEXT+6*8(%r6)
105 std %r19,PCB_CONTEXT+7*8(%r6)
106 std %r20,PCB_CONTEXT+8*8(%r6)
107 std %r21,PCB_CONTEXT+9*8(%r6)
108 std %r22,PCB_CONTEXT+10*8(%r6)
109 std %r23,PCB_CONTEXT+11*8(%r6)
110 std %r24,PCB_CONTEXT+12*8(%r6)
111 std %r25,PCB_CONTEXT+13*8(%r6)
112 std %r26,PCB_CONTEXT+14*8(%r6)
113 std %r27,PCB_CONTEXT+15*8(%r6)
114 std %r28,PCB_CONTEXT+16*8(%r6)
115 std %r29,PCB_CONTEXT+17*8(%r6)
116 std %r30,PCB_CONTEXT+18*8(%r6)
117 std %r31,PCB_CONTEXT+19*8(%r6)
119 mfcr %r16 /* Save the condition register */
121 mflr %r16 /* Save the link register */
123 std %r1,PCB_SP(%r6) /* Save the stack pointer */
124 std %r2,PCB_TOC(%r6) /* Save the TOC pointer */
126 mr %r14,%r3 /* Copy the old thread ptr... */
127 mr %r13,%r4 /* and the new thread ptr in curthread*/
128 mr %r16,%r5 /* and the new lock */
129 mr %r17,%r6 /* and the PCB */
133 lwz %r18, PCB_FLAGS(%r17)
134 andi. %r7, %r18, PCB_CFSCR
137 std %r6, PCB_FSCR(%r17)
139 andi. %r0, %r6, FSCR_EBB
142 std %r7, PCB_EBB_EBBHR(%r17)
144 std %r7, PCB_EBB_EBBRR(%r17)
146 std %r7, PCB_EBB_BESCR(%r17)
148 andi. %r0, %r6, FSCR_LM
151 std %r7, PCB_LMON_LMRR(%r17)
153 std %r7, PCB_LMON_LMSER(%r17)
155 andi. %r0, %r6, FSCR_TAR
158 std %r7, PCB_TAR(%r17)
160 andi. %r7, %r18, PCB_CDSCR
163 std %r6, PCB_DSCR(%r17)
166 /* Save FPU context if needed */
167 andi. %r7, %r18, PCB_FPU
173 mr %r3,%r14 /* restore old thread ptr */
174 /* Save Altivec context if needed */
175 andi. %r7, %r18, PCB_VEC
181 mr %r3,%r14 /* restore old thread ptr */
182 bl pmap_deactivate /* Deactivate the current pmap */
185 sync /* Make sure all of that finished */
188 #if defined(SMP) && defined(SCHED_ULE)
189 /* Wait for the new thread to become unblocked */
190 addis %r6,%r2,TOC_REF(blocked_lock)@ha
191 ld %r6,TOC_REF(blocked_lock)@l(%r6)
199 ld %r17,TD_PCB(%r13) /* Get new PCB */
200 ld %r1,PCB_SP(%r17) /* Load the stack pointer */
201 addi %r1,%r1,-48 /* Remember about cpu_switch stack frame */
203 /* Release old thread now that we have a stack pointer set up */
206 std %r16,TD_LOCK(%r14) /* ULE: update old thread's lock */
208 1: mfsprg %r7,0 /* Get the pcpu pointer */
209 std %r13,PC_CURTHREAD(%r7) /* Store new current thread */
210 ld %r17,TD_PCB(%r13) /* Store new current PCB */
211 std %r17,PC_CURPCB(%r7)
213 mr %r3,%r13 /* Get new thread ptr */
214 bl pmap_activate /* Activate the new address space */
217 lwz %r19, PCB_FLAGS(%r17)
218 /* Restore FPU context if needed */
219 andi. %r6, %r19, PCB_FPU
221 mr %r3,%r13 /* Pass curthread to enable_fpu */
226 /* Restore Altivec context if needed */
227 andi. %r6, %r19, PCB_VEC
229 mr %r3,%r13 /* Pass curthread to enable_vec */
234 /* Load custom DSCR on PowerISA 2.06+ CPUs. */
235 /* Load changed FSCR on PowerISA 2.07+ CPUs. */
237 /* Restore Custom DSCR if needed (zeroes if in old but not new) */
238 andi. %r6, %r18, PCB_CDSCR
240 ld %r7, PCB_DSCR(%r17) /* Load the DSCR register*/
243 /* Restore FSCR if needed (zeroes if in old but not new) */
244 andi. %r6, %r18, PCB_CFSCR
246 ld %r7, PCB_FSCR(%r17) /* Load the FSCR register*/
249 andi. %r0, %r7, FSCR_EBB
251 ld %r6, PCB_EBB_EBBHR(%r17)
253 ld %r6, PCB_EBB_EBBRR(%r17)
255 ld %r6, PCB_EBB_BESCR(%r17)
258 andi. %r0, %r7, FSCR_LM
260 ld %r6, PCB_LMON_LMRR(%r17)
262 ld %r6, PCB_LMON_LMSER(%r17)
265 andi. %r0, %r7, FSCR_TAR
267 ld %r6, PCB_TAR(%r17)
270 /* thread to restore is in r3 */
273 mr %r3,%r17 /* Recover PCB ptr */
274 ld %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs. */
275 ld %r14,PCB_CONTEXT+2*8(%r3)
276 ld %r15,PCB_CONTEXT+3*8(%r3)
277 ld %r16,PCB_CONTEXT+4*8(%r3)
278 ld %r17,PCB_CONTEXT+5*8(%r3)
279 ld %r18,PCB_CONTEXT+6*8(%r3)
280 ld %r19,PCB_CONTEXT+7*8(%r3)
281 ld %r20,PCB_CONTEXT+8*8(%r3)
282 ld %r21,PCB_CONTEXT+9*8(%r3)
283 ld %r22,PCB_CONTEXT+10*8(%r3)
284 ld %r23,PCB_CONTEXT+11*8(%r3)
285 ld %r24,PCB_CONTEXT+12*8(%r3)
286 ld %r25,PCB_CONTEXT+13*8(%r3)
287 ld %r26,PCB_CONTEXT+14*8(%r3)
288 ld %r27,PCB_CONTEXT+15*8(%r3)
289 ld %r28,PCB_CONTEXT+16*8(%r3)
290 ld %r29,PCB_CONTEXT+17*8(%r3)
291 ld %r30,PCB_CONTEXT+18*8(%r3)
292 ld %r31,PCB_CONTEXT+19*8(%r3)
293 ld %r5,PCB_CR(%r3) /* Load the condition register */
295 ld %r5,PCB_LR(%r3) /* Load the link register */
297 ld %r1,PCB_SP(%r3) /* Load the stack pointer */
298 ld %r2,PCB_TOC(%r3) /* Load the TOC pointer */
301 * Perform a dummy stdcx. to clear any reservations we may have
302 * inherited from the previous thread. It doesn't matter if the
303 * stdcx succeeds or not. pcb_context[0] can be clobbered.
310 * Update pcb, saving current processor state
313 std %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs. */
314 std %r13,PCB_CONTEXT+1*8(%r3)
315 std %r14,PCB_CONTEXT+2*8(%r3)
316 std %r15,PCB_CONTEXT+3*8(%r3)
317 std %r16,PCB_CONTEXT+4*8(%r3)
318 std %r17,PCB_CONTEXT+5*8(%r3)
319 std %r18,PCB_CONTEXT+6*8(%r3)
320 std %r19,PCB_CONTEXT+7*8(%r3)
321 std %r20,PCB_CONTEXT+8*8(%r3)
322 std %r21,PCB_CONTEXT+9*8(%r3)
323 std %r22,PCB_CONTEXT+10*8(%r3)
324 std %r23,PCB_CONTEXT+11*8(%r3)
325 std %r24,PCB_CONTEXT+12*8(%r3)
326 std %r25,PCB_CONTEXT+13*8(%r3)
327 std %r26,PCB_CONTEXT+14*8(%r3)
328 std %r27,PCB_CONTEXT+15*8(%r3)
329 std %r28,PCB_CONTEXT+16*8(%r3)
330 std %r29,PCB_CONTEXT+17*8(%r3)
331 std %r30,PCB_CONTEXT+18*8(%r3)
332 std %r31,PCB_CONTEXT+19*8(%r3)
334 mfcr %r4 /* Save the condition register */
336 std %r1,PCB_SP(%r3) /* Save the stack pointer */
337 std %r2,PCB_TOC(%r3) /* Save the TOC pointer */
338 mflr %r4 /* Save the link register */
344 * Set up the return from cpu_fork()
347 ENTRY_NOPROF(fork_trampoline)
355 addi %r1,%r1,48+CF_SIZE-FSP /* Allow 8 bytes in front of
356 trapframe to simulate FRAME_SETUP
357 does when allocating space for
358 a frame pointer/saved LR */