2 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
3 * Copyright (C) 1995, 1996 TooLs GmbH.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by TooLs GmbH.
17 * 4. The name of TooLs GmbH may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 * Copyright (C) 2001 Benno Rice
33 * All rights reserved.
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 * notice, this list of conditions and the following disclaimer in the
42 * documentation and/or other materials provided with the distribution.
44 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
45 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
47 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
49 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
50 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
51 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
52 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
53 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54 * $NetBSD: machdep.c,v 1.74.2.1 2000/11/01 16:13:48 tv Exp $
57 #include <sys/cdefs.h>
58 __FBSDID("$FreeBSD$");
61 #include "opt_kstack_pages.h"
62 #include "opt_platform.h"
64 #include <sys/param.h>
66 #include <sys/systm.h>
72 #include <sys/eventhandler.h>
74 #include <sys/imgact.h>
76 #include <sys/kernel.h>
78 #include <sys/linker.h>
80 #include <sys/malloc.h>
82 #include <sys/msgbuf.h>
83 #include <sys/mutex.h>
84 #include <sys/ptrace.h>
85 #include <sys/reboot.h>
86 #include <sys/rwlock.h>
87 #include <sys/signalvar.h>
88 #include <sys/syscallsubr.h>
89 #include <sys/sysctl.h>
90 #include <sys/sysent.h>
91 #include <sys/sysproto.h>
92 #include <sys/ucontext.h>
94 #include <sys/vmmeter.h>
95 #include <sys/vnode.h>
97 #include <net/netisr.h>
100 #include <vm/vm_extern.h>
101 #include <vm/vm_kern.h>
102 #include <vm/vm_page.h>
103 #include <vm/vm_map.h>
104 #include <vm/vm_object.h>
105 #include <vm/vm_pager.h>
107 #include <machine/altivec.h>
108 #ifndef __powerpc64__
109 #include <machine/bat.h>
111 #include <machine/cpu.h>
112 #include <machine/elf.h>
113 #include <machine/fpu.h>
114 #include <machine/hid.h>
115 #include <machine/kdb.h>
116 #include <machine/md_var.h>
117 #include <machine/metadata.h>
118 #include <machine/mmuvar.h>
119 #include <machine/pcb.h>
120 #include <machine/reg.h>
121 #include <machine/sigframe.h>
122 #include <machine/spr.h>
123 #include <machine/trap.h>
124 #include <machine/vmparam.h>
125 #include <machine/ofw_machdep.h>
129 #include <dev/ofw/openfirm.h>
132 #include "mmu_oea64.h"
135 #ifndef __powerpc64__
136 struct bat battable[16];
141 #ifndef __powerpc64__
142 /* Bits for running on 64-bit systems in 32-bit mode. */
143 extern void *testppc64, *testppc64size;
144 extern void *restorebridge, *restorebridgesize;
145 extern void *rfid_patch, *rfi_patch1, *rfi_patch2;
146 extern void *trapcode64;
148 extern Elf_Addr _GLOBAL_OFFSET_TABLE_[];
151 extern void *rstcode, *rstcodeend;
152 extern void *trapcode, *trapcodeend;
153 extern void *hypertrapcode, *hypertrapcodeend;
154 extern void *generictrap, *generictrap64;
155 extern void *alitrap, *aliend;
156 extern void *dsitrap, *dsiend;
157 extern void *decrint, *decrsize;
158 extern void *extint, *extsize;
159 extern void *dblow, *dbend;
160 extern void *imisstrap, *imisssize;
161 extern void *dlmisstrap, *dlmisssize;
162 extern void *dsmisstrap, *dsmisssize;
164 extern void *ap_pcpu;
165 extern void __restartkernel(vm_offset_t, vm_offset_t, vm_offset_t, void *, uint32_t, register_t offset, register_t msr);
166 extern void __restartkernel_virtual(vm_offset_t, vm_offset_t, vm_offset_t, void *, uint32_t, register_t offset, register_t msr);
168 void aim_early_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry,
169 void *mdp, uint32_t mdp_cookie);
170 void aim_cpu_init(vm_offset_t toc);
173 aim_early_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry, void *mdp,
179 * If running from an FDT, make sure we are in real mode to avoid
180 * tromping on firmware page tables. Everything in the kernel assumes
181 * 1:1 mappings out of firmware, so this won't break anything not
182 * already broken. This doesn't work if there is live OF, since OF
183 * may internally use non-1:1 mappings.
186 mtmsr(mfmsr() & ~(PSL_IR | PSL_DR));
190 * Relocate to high memory so that the kernel
191 * can execute from the direct map.
193 * If we are in virtual mode already, use a special entry point
194 * that sets up a temporary DMAP to execute from until we can
195 * properly set up the MMU.
197 if ((vm_offset_t)&aim_early_init < DMAP_BASE_ADDRESS) {
198 if (mfmsr() & PSL_DR) {
199 __restartkernel_virtual(fdt, 0, ofentry, mdp,
200 mdp_cookie, DMAP_BASE_ADDRESS, mfmsr());
202 __restartkernel(fdt, 0, ofentry, mdp, mdp_cookie,
203 DMAP_BASE_ADDRESS, mfmsr());
208 /* Various very early CPU fix ups */
209 switch (mfpvr() >> 16) {
211 * PowerPC 970 CPUs have a misfeature requested by Apple that
212 * makes them pretend they have a 32-byte cacheline. Turn this
213 * off before we measure the cacheline size.
219 scratch = mfspr(SPR_HID5);
220 scratch &= ~HID5_970_DCBZ_SIZE_HI;
221 mtspr(SPR_HID5, scratch);
230 /* XXX: get from ibm,slb-size in device tree */
238 aim_cpu_init(vm_offset_t toc)
240 size_t trap_offset, trapsize;
243 uint8_t *cache_check;
245 #ifndef __powerpc64__
253 /* General setup for AIM CPUs */
254 psl_kernset = PSL_EE | PSL_ME | PSL_IR | PSL_DR | PSL_RI;
257 psl_kernset |= PSL_SF;
258 if (mfmsr() & PSL_HV)
259 psl_kernset |= PSL_HV;
261 psl_userset = psl_kernset | PSL_PR;
263 psl_userset32 = psl_userset & ~PSL_SF;
267 * Zeroed bits in this variable signify that the value of the bit
268 * in its position is allowed to vary between userspace contexts.
270 * All other bits are required to be identical for every userspace
271 * context. The actual *value* of the bit is determined by
272 * psl_userset and/or psl_userset32, and is not allowed to change.
274 * Remember to update this set when implementing support for
275 * *conditionally* enabling a processor facility. Failing to do
276 * this will cause swapcontext() in userspace to break when a
277 * process uses a conditionally-enabled facility.
279 * When *unconditionally* implementing support for a processor
280 * facility, update psl_userset / psl_userset32 instead.
282 * See the access control check in set_mcontext().
284 psl_userstatic = ~(PSL_VSX | PSL_VEC | PSL_FP | PSL_FE0 | PSL_FE1);
286 * Mask bits from the SRR1 that aren't really the MSR:
287 * Bits 1-4, 10-15 (ppc32), 33-36, 42-47 (ppc64)
289 psl_userstatic &= ~0x783f0000UL;
292 * Initialize the interrupt tables and figure out our cache line
293 * size and whether or not we need the 64-bit bridge code.
297 * Disable translation in case the vector area hasn't been
298 * mapped (G5). Note that no OFW calls can be made until
299 * translation is re-enabled.
303 mtmsr((msr & ~(PSL_IR | PSL_DR)) | PSL_RI);
306 * Measure the cacheline size using dcbz
308 * Use EXC_PGM as a playground. We are about to overwrite it
309 * anyway, we know it exists, and we know it is cache-aligned.
312 cache_check = (void *)EXC_PGM;
314 for (cacheline_size = 0; cacheline_size < 0x100; cacheline_size++)
315 cache_check[cacheline_size] = 0xff;
317 __asm __volatile("dcbz 0,%0":: "r" (cache_check) : "memory");
319 /* Find the first byte dcbz did not zero to get the cache line size */
320 for (cacheline_size = 0; cacheline_size < 0x100 &&
321 cache_check[cacheline_size] == 0; cacheline_size++);
323 /* Work around psim bug */
324 if (cacheline_size == 0) {
329 #ifndef __powerpc64__
331 * Figure out whether we need to use the 64 bit PMAP. This works by
332 * executing an instruction that is only legal on 64-bit PPC (mtmsrd),
333 * and setting ppc64 = 0 if that causes a trap.
338 bcopy(&testppc64, (void *)EXC_PGM, (size_t)&testppc64size);
339 __syncicache((void *)EXC_PGM, (size_t)&testppc64size);
347 : "=r"(scratch), "=r"(ppc64));
350 cpu_features |= PPC_FEATURE_64;
353 * Now copy restorebridge into all the handlers, if necessary,
354 * and set up the trap tables.
357 if (cpu_features & PPC_FEATURE_64) {
358 /* Patch the two instances of rfi -> rfid */
359 bcopy(&rfid_patch,&rfi_patch1,4);
361 /* rfi_patch2 is at the end of dbleave */
362 bcopy(&rfid_patch,&rfi_patch2,4);
365 #else /* powerpc64 */
366 cpu_features |= PPC_FEATURE_64;
369 trapsize = (size_t)&trapcodeend - (size_t)&trapcode;
372 * Copy generic handler into every possible trap. Special cases will get
373 * different ones in a minute.
375 for (trap = EXC_RST; trap < EXC_LAST; trap += 0x20)
376 bcopy(&trapcode, (void *)trap, trapsize);
378 #ifndef __powerpc64__
379 if (cpu_features & PPC_FEATURE_64) {
381 * Copy a code snippet to restore 32-bit bridge mode
382 * to the top of every non-generic trap handler
385 trap_offset += (size_t)&restorebridgesize;
386 bcopy(&restorebridge, (void *)EXC_RST, trap_offset);
387 bcopy(&restorebridge, (void *)EXC_DSI, trap_offset);
388 bcopy(&restorebridge, (void *)EXC_ALI, trap_offset);
389 bcopy(&restorebridge, (void *)EXC_PGM, trap_offset);
390 bcopy(&restorebridge, (void *)EXC_MCHK, trap_offset);
391 bcopy(&restorebridge, (void *)EXC_TRC, trap_offset);
392 bcopy(&restorebridge, (void *)EXC_BPT, trap_offset);
395 * Use an IBAT and a DBAT to map the bottom 256M segment.
397 * It is very important to do it *now* to avoid taking a
398 * fault in .text / .data before the MMU is bootstrapped,
399 * because until then, the translation data has not been
400 * copied over from OpenFirmware, so our DSI/ISI will fail
404 battable[0x0].batl = BATL(0x00000000, BAT_M, BAT_PP_RW);
405 battable[0x0].batu = BATU(0x00000000, BAT_BL_256M, BAT_Vs);
407 __asm (".balign 32; \n"
408 "mtibatu 0,%0; mtibatl 0,%1; isync; \n"
409 "mtdbatu 0,%0; mtdbatl 0,%1; isync"
410 :: "r"(battable[0].batu), "r"(battable[0].batl));
413 trapsize = (size_t)&hypertrapcodeend - (size_t)&hypertrapcode;
414 bcopy(&hypertrapcode, (void *)(EXC_HEA + trap_offset), trapsize);
415 bcopy(&hypertrapcode, (void *)(EXC_HMI + trap_offset), trapsize);
416 bcopy(&hypertrapcode, (void *)(EXC_HVI + trap_offset), trapsize);
417 bcopy(&hypertrapcode, (void *)(EXC_SOFT_PATCH + trap_offset), trapsize);
420 bcopy(&rstcode, (void *)(EXC_RST + trap_offset), (size_t)&rstcodeend -
424 bcopy(&dblow, (void *)(EXC_MCHK + trap_offset), (size_t)&dbend -
426 bcopy(&dblow, (void *)(EXC_PGM + trap_offset), (size_t)&dbend -
428 bcopy(&dblow, (void *)(EXC_TRC + trap_offset), (size_t)&dbend -
430 bcopy(&dblow, (void *)(EXC_BPT + trap_offset), (size_t)&dbend -
433 bcopy(&alitrap, (void *)(EXC_ALI + trap_offset), (size_t)&aliend -
435 bcopy(&dsitrap, (void *)(EXC_DSI + trap_offset), (size_t)&dsiend -
438 /* Set address of generictrap for self-reloc calculations */
439 *((void **)TRAP_GENTRAP) = &generictrap;
441 /* Set TOC base so that the interrupt code can get at it */
442 *((void **)TRAP_ENTRY) = &generictrap;
443 *((register_t *)TRAP_TOCBASE) = toc;
445 /* Set branch address for trap code */
446 if (cpu_features & PPC_FEATURE_64)
447 *((void **)TRAP_ENTRY) = &generictrap64;
449 *((void **)TRAP_ENTRY) = &generictrap;
450 *((void **)TRAP_TOCBASE) = _GLOBAL_OFFSET_TABLE_;
452 /* G2-specific TLB miss helper handlers */
453 bcopy(&imisstrap, (void *)EXC_IMISS, (size_t)&imisssize);
454 bcopy(&dlmisstrap, (void *)EXC_DLMISS, (size_t)&dlmisssize);
455 bcopy(&dsmisstrap, (void *)EXC_DSMISS, (size_t)&dsmisssize);
457 __syncicache(EXC_RSVD, EXC_LAST - EXC_RSVD);
464 /* Warn if cachline size was not determined */
465 if (cacheline_warn == 1) {
466 printf("WARNING: cacheline size undetermined, setting to 32\n");
470 * Initialise virtual memory. Use BUS_PROBE_GENERIC priority
471 * in case the platform module had a better idea of what we
474 if (cpu_features2 & PPC_FEATURE2_ARCH_3_00) {
476 TUNABLE_INT_FETCH("radix_mmu", &radix_mmu);
478 pmap_mmu_install(MMU_TYPE_RADIX, BUS_PROBE_GENERIC);
480 pmap_mmu_install(MMU_TYPE_G5, BUS_PROBE_GENERIC);
481 } else if (cpu_features & PPC_FEATURE_64)
482 pmap_mmu_install(MMU_TYPE_G5, BUS_PROBE_GENERIC);
484 pmap_mmu_install(MMU_TYPE_OEA, BUS_PROBE_GENERIC);
488 * Shutdown the CPU as much as possible.
498 ptrace_single_step(struct thread *td)
500 struct trapframe *tf;
509 ptrace_clear_single_step(struct thread *td)
511 struct trapframe *tf;
520 kdb_cpu_clear_singlestep(void)
523 kdb_frame->srr1 &= ~PSL_SE;
527 kdb_cpu_set_singlestep(void)
530 kdb_frame->srr1 |= PSL_SE;
534 * Initialise a struct pcpu.
537 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t sz)
540 /* Copy the SLB contents from the current CPU */
541 memcpy(pcpu->pc_aim.slb, PCPU_GET(aim.slb), sizeof(pcpu->pc_aim.slb));
545 /* Return 0 on handled success, otherwise signal number. */
547 cpu_machine_check(struct thread *td, struct trapframe *frame, int *ucode)
551 * This block is 64-bit CPU specific currently. Punt running in 32-bit
552 * mode on 64-bit CPUs.
554 /* Check if the important information is in DSISR */
555 if ((frame->srr1 & SRR1_MCHK_DATA) != 0) {
556 printf("Machine check, DSISR: %016lx\n", frame->cpu.aim.dsisr);
557 /* SLB multi-hit is recoverable. */
558 if ((frame->cpu.aim.dsisr & DSISR_MC_SLB_MULTIHIT) != 0)
560 if ((frame->cpu.aim.dsisr & DSISR_MC_DERAT_MULTIHIT) != 0) {
564 /* TODO: Add other machine check recovery procedures. */
566 if ((frame->srr1 & SRR1_MCHK_IFETCH_M) == SRR1_MCHK_IFETCH_SLBMH)
574 #ifndef __powerpc64__
576 va_to_vsid(pmap_t pm, vm_offset_t va)
578 return ((pm->pm_sr[(uintptr_t)va >> ADDR_SR_SHFT]) & SR_VSID_MASK);
584 * These functions need to provide addresses that both (a) work in real mode
585 * (or whatever mode/circumstances the kernel is in in early boot (now)) and
586 * (b) can still, in principle, work once the kernel is going. Because these
587 * rely on existing mappings/real mode, unmap is a no-op.
590 pmap_early_io_map(vm_paddr_t pa, vm_size_t size)
592 KASSERT(!pmap_bootstrapped, ("Not available after PMAP started!"));
595 * If we have the MMU up in early boot, assume it is 1:1. Otherwise,
596 * try to get the address in a memory region compatible with the
597 * direct map for efficiency later.
599 if (mfmsr() & PSL_DR)
602 return (DMAP_BASE_ADDRESS + pa);
606 pmap_early_io_unmap(vm_offset_t va, vm_size_t size)
609 KASSERT(!pmap_bootstrapped, ("Not available after PMAP started!"));
612 /* From p3-53 of the MPC7450 RISC Microprocessor Family Reference Manual */
614 flush_disable_caches(void)
618 register_t cache_reg;
619 volatile uint32_t *memp;
626 mtmsr(msr & ~(PSL_EE | PSL_DR));
627 msscr0 = mfspr(SPR_MSSCR0);
628 msscr0 &= ~MSSCR0_L2PFE;
629 mtspr(SPR_MSSCR0, msscr0);
632 /* 7e00066c: dssall */
633 __asm__ __volatile__(".long 0x7e00066c; sync");
636 __asm__ __volatile__("dcbf 0,%0" :: "r"(0));
637 __asm__ __volatile__("dcbf 0,%0" :: "r"(0));
638 __asm__ __volatile__("dcbf 0,%0" :: "r"(0));
640 /* Lock the L1 Data cache. */
641 mtspr(SPR_LDSTCR, mfspr(SPR_LDSTCR) | 0xFF);
645 mtspr(SPR_LDSTCR, 0);
648 * Perform this in two stages: Flush the cache starting in RAM, then do it
651 memp = (volatile uint32_t *)0x00000000;
652 for (i = 0; i < 128 * 1024; i++) {
654 __asm__ __volatile__("dcbf 0,%0" :: "r"(memp));
655 memp += 32/sizeof(*memp);
658 memp = (volatile uint32_t *)0xfff00000;
662 mtspr(SPR_LDSTCR, x);
663 for (i = 0; i < 128; i++) {
665 __asm__ __volatile__("dcbf 0,%0" :: "r"(memp));
666 memp += 32/sizeof(*memp);
668 x = ((x << 1) | 1) & 0xff;
670 mtspr(SPR_LDSTCR, 0);
672 cache_reg = mfspr(SPR_L2CR);
673 if (cache_reg & L2CR_L2E) {
674 cache_reg &= ~(L2CR_L2IO_7450 | L2CR_L2DO_7450);
675 mtspr(SPR_L2CR, cache_reg);
677 mtspr(SPR_L2CR, cache_reg | L2CR_L2HWF);
678 while (mfspr(SPR_L2CR) & L2CR_L2HWF)
679 ; /* Busy wait for cache to flush */
681 cache_reg &= ~L2CR_L2E;
682 mtspr(SPR_L2CR, cache_reg);
684 mtspr(SPR_L2CR, cache_reg | L2CR_L2I);
686 while (mfspr(SPR_L2CR) & L2CR_L2I)
687 ; /* Busy wait for L2 cache invalidate */
691 cache_reg = mfspr(SPR_L3CR);
692 if (cache_reg & L3CR_L3E) {
693 cache_reg &= ~(L3CR_L3IO | L3CR_L3DO);
694 mtspr(SPR_L3CR, cache_reg);
696 mtspr(SPR_L3CR, cache_reg | L3CR_L3HWF);
697 while (mfspr(SPR_L3CR) & L3CR_L3HWF)
698 ; /* Busy wait for cache to flush */
700 cache_reg &= ~L3CR_L3E;
701 mtspr(SPR_L3CR, cache_reg);
703 mtspr(SPR_L3CR, cache_reg | L3CR_L3I);
705 while (mfspr(SPR_L3CR) & L3CR_L3I)
706 ; /* Busy wait for L3 cache invalidate */
710 mtspr(SPR_HID0, mfspr(SPR_HID0) & ~HID0_DCE);
720 static u_quad_t timebase = 0;
721 static register_t sprgs[4];
722 static register_t srrs[2];
725 struct thread *fputd;
726 struct thread *vectd;
729 register_t saved_msr;
733 PCPU_SET(restore, &resetjb);
736 fputd = PCPU_GET(fputhread);
737 vectd = PCPU_GET(vecthread);
742 if (setjmp(resetjb) == 0) {
743 sprgs[0] = mfspr(SPR_SPRG0);
744 sprgs[1] = mfspr(SPR_SPRG1);
745 sprgs[2] = mfspr(SPR_SPRG2);
746 sprgs[3] = mfspr(SPR_SPRG3);
747 srrs[0] = mfspr(SPR_SRR0);
748 srrs[1] = mfspr(SPR_SRR1);
751 flush_disable_caches();
752 hid0 = mfspr(SPR_HID0);
753 hid0 = (hid0 & ~(HID0_DOZE | HID0_NAP)) | HID0_SLEEP;
756 msr = mfmsr() | PSL_POW;
757 mtspr(SPR_HID0, hid0);
763 platform_smp_timebase_sync(timebase, 0);
764 PCPU_SET(curthread, curthread);
765 PCPU_SET(curpcb, curthread->td_pcb);
766 pmap_activate(curthread);
768 mtspr(SPR_SPRG0, sprgs[0]);
769 mtspr(SPR_SPRG1, sprgs[1]);
770 mtspr(SPR_SPRG2, sprgs[2]);
771 mtspr(SPR_SPRG3, sprgs[3]);
772 mtspr(SPR_SRR0, srrs[0]);
773 mtspr(SPR_SRR1, srrs[1]);
775 if (fputd == curthread)
776 enable_fpu(curthread);
777 if (vectd == curthread)
778 enable_vec(curthread);