| cpu_switch.S (115006) | cpu_switch.S (122292) |
|---|---|
| 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 --- 19 unchanged lines hidden (view full) --- 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 --- 19 unchanged lines hidden (view full) --- 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 * $FreeBSD: head/sys/amd64/amd64/cpu_switch.S 115006 2003-05-15 00:23:40Z peter $ | 36 * $FreeBSD: head/sys/amd64/amd64/cpu_switch.S 122292 2003-11-08 03:33:38Z peter $ |
| 37 */ 38 39#include <machine/asmacros.h> 40 41#include "assym.s" 42 43/*****************************************************************************/ 44/* Scheduling */ --- 81 unchanged lines hidden (view full) --- 126 127 /* have we used fp, and need a save? */ 128 cmpq %rdi,PCPU(FPCURTHREAD) 129 jne 1f 130 pushq %rdi 131 pushq %rsi 132 addq $PCB_SAVEFPU,%r8 /* h/w bugs make saving complicated */ 133 movq %r8, %rdi | 37 */ 38 39#include <machine/asmacros.h> 40 41#include "assym.s" 42 43/*****************************************************************************/ 44/* Scheduling */ --- 81 unchanged lines hidden (view full) --- 126 127 /* have we used fp, and need a save? */ 128 cmpq %rdi,PCPU(FPCURTHREAD) 129 jne 1f 130 pushq %rdi 131 pushq %rsi 132 addq $PCB_SAVEFPU,%r8 /* h/w bugs make saving complicated */ 133 movq %r8, %rdi |
| 134 call npxsave /* do it in a big C function */ | 134 call fpusave /* do it in a big C function */ |
| 135 popq %rsi 136 popq %rdi 1371: 138 139 /* Save is done. Now fire up new thread. Leave old vmspace. */ 140#ifdef INVARIANTS 141 testq %rsi,%rsi /* no thread? */ 142 jz badsw3 /* no, panic */ --- 153 unchanged lines hidden (view full) --- 296 movq %r12,PCB_R12(%rcx) 297 movq %r13,PCB_R13(%rcx) 298 movq %r14,PCB_R14(%rcx) 299 movq %r15,PCB_R15(%rcx) 300 pushfq 301 popq PCB_RFLAGS(%rcx) 302 303 /* | 135 popq %rsi 136 popq %rdi 1371: 138 139 /* Save is done. Now fire up new thread. Leave old vmspace. */ 140#ifdef INVARIANTS 141 testq %rsi,%rsi /* no thread? */ 142 jz badsw3 /* no, panic */ --- 153 unchanged lines hidden (view full) --- 296 movq %r12,PCB_R12(%rcx) 297 movq %r13,PCB_R13(%rcx) 298 movq %r14,PCB_R14(%rcx) 299 movq %r15,PCB_R15(%rcx) 300 pushfq 301 popq PCB_RFLAGS(%rcx) 302 303 /* |
| 304 * If fpcurthread == NULL, then the npx h/w state is irrelevant and the | 304 * If fpcurthread == NULL, then the fpu h/w state is irrelevant and the |
| 305 * state had better already be in the pcb. This is true for forks 306 * but not for dumps (the old book-keeping with FP flags in the pcb 307 * always lost for dumps because the dump pcb has 0 flags). 308 * | 305 * state had better already be in the pcb. This is true for forks 306 * but not for dumps (the old book-keeping with FP flags in the pcb 307 * always lost for dumps because the dump pcb has 0 flags). 308 * |
| 309 * If fpcurthread != NULL, then we have to save the npx h/w state to | 309 * If fpcurthread != NULL, then we have to save the fpu h/w state to |
| 310 * fpcurthread's pcb and copy it to the requested pcb, or save to the 311 * requested pcb and reload. Copying is easier because we would 312 * have to handle h/w bugs for reloading. We used to lose the | 310 * fpcurthread's pcb and copy it to the requested pcb, or save to the 311 * requested pcb and reload. Copying is easier because we would 312 * have to handle h/w bugs for reloading. We used to lose the |
| 313 * parent's npx state for forks by forgetting to reload. | 313 * parent's fpu state for forks by forgetting to reload. |
| 314 */ 315 pushfq 316 cli 317 movq PCPU(FPCURTHREAD),%rax 318 testq %rax,%rax 319 je 1f 320 321 pushq %rcx 322 pushq %rax 323 movq TD_PCB(%rax),%rdi 324 leaq PCB_SAVEFPU(%rdi),%rdi | 314 */ 315 pushfq 316 cli 317 movq PCPU(FPCURTHREAD),%rax 318 testq %rax,%rax 319 je 1f 320 321 pushq %rcx 322 pushq %rax 323 movq TD_PCB(%rax),%rdi 324 leaq PCB_SAVEFPU(%rdi),%rdi |
| 325 call npxsave | 325 call fpusave |
| 326 popq %rax 327 popq %rcx 328 329 movq $PCB_SAVEFPU_SIZE,%rdx /* arg 3 */ 330 leaq PCB_SAVEFPU(%rcx),%rsi /* arg 2 */ 331 movq %rax,%rdi /* arg 1 */ 332 call bcopy 3331: 334 popfq 335 336 ret | 326 popq %rax 327 popq %rcx 328 329 movq $PCB_SAVEFPU_SIZE,%rdx /* arg 3 */ 330 leaq PCB_SAVEFPU(%rcx),%rsi /* arg 2 */ 331 movq %rax,%rdi /* arg 1 */ 332 call bcopy 3331: 334 popfq 335 336 ret |