cpu_switch.S (d230622648ed9a4c08153a019f97d784d400775b) cpu_switch.S (0e195446b70cdb3130378505b24603031c1f3ce0)
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without

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28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without

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28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * $Id: swtch.s,v 1.4 1994/01/31 10:26:59 davidg Exp $
36 * $Id: swtch.s,v 1.5 1994/04/02 07:00:30 davidg Exp $
37 */
38
39#include "npx.h" /* for NNPX */
40#include "assym.s" /* for preprocessor defines */
41#include "errno.h" /* for error codes */
42
43#include "machine/asmacros.h" /* for miscellaneous assembly macros */
44#define LOCORE /* XXX inhibit C declarations */

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151 */
152 movl $SWI_AST_MASK,_cpl
153 testl $~SWI_AST_MASK,_ipending
154 je idle_loop
155 call _splz
156
157 ALIGN_TEXT
158idle_loop:
37 */
38
39#include "npx.h" /* for NNPX */
40#include "assym.s" /* for preprocessor defines */
41#include "errno.h" /* for error codes */
42
43#include "machine/asmacros.h" /* for miscellaneous assembly macros */
44#define LOCORE /* XXX inhibit C declarations */

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151 */
152 movl $SWI_AST_MASK,_cpl
153 testl $~SWI_AST_MASK,_ipending
154 je idle_loop
155 call _splz
156
157 ALIGN_TEXT
158idle_loop:
159 cli
159 cmpl $0,_whichqs
160 cmpl $0,_whichqs
160 jne sw1
161 jne sw1a
162 sti
161 hlt /* wait for interrupt */
162 jmp idle_loop
163
164badsw:
165 pushl $sw0
166 call _panic
167 /*NOTREACHED*/
168

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209 movl $0,_curproc /* out of process */
210
211# movw _cpl,%ax
212# movw %ax,PCB_IML(%ecx) /* save ipl */
213
214 /* save is done, now choose a new process or idle */
215sw1:
216 cli
163 hlt /* wait for interrupt */
164 jmp idle_loop
165
166badsw:
167 pushl $sw0
168 call _panic
169 /*NOTREACHED*/
170

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211 movl $0,_curproc /* out of process */
212
213# movw _cpl,%ax
214# movw %ax,PCB_IML(%ecx) /* save ipl */
215
216 /* save is done, now choose a new process or idle */
217sw1:
218 cli
219sw1a:
217 movl _whichqs,%edi
2182:
219 /* XXX - bsf is sloow */
220 bsfl %edi,%eax /* find a full q */
221 je _idle /* if none, idle */
222
223 /* XX update whichqs? */
224 btrl %eax,%edi /* clear q full status */

--- 231 unchanged lines hidden --- 		220 movl _whichqs,%edi
2212:
222 /* XXX - bsf is sloow */
223 bsfl %edi,%eax /* find a full q */
224 je _idle /* if none, idle */
225
226 /* XX update whichqs? */
227 btrl %eax,%edi /* clear q full status */

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