2 * Copyright (c) 1982, 1986 The Regents of the University of California.
3 * Copyright (c) 1989, 1990 William Jolitz
4 * Copyright (c) 1994 John Dyson
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
9 * Science Department, and William Jolitz.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
36 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
37 * from: src/sys/i386/i386/vm_machdep.c,v 1.132.2.2 2000/08/26 04:19:26 yokota
38 * JNPR: vm_machdep.c,v 1.8.2.2 2007/08/16 15:59:17 girish
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
44 #include "opt_compat.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/malloc.h>
51 #include <sys/syscall.h>
52 #include <sys/sysent.h>
54 #include <sys/vnode.h>
55 #include <sys/vmmeter.h>
56 #include <sys/kernel.h>
57 #include <sys/sysctl.h>
58 #include <sys/unistd.h>
60 #include <machine/cache.h>
61 #include <machine/clock.h>
62 #include <machine/cpu.h>
63 #include <machine/cpufunc.h>
64 #include <machine/cpuinfo.h>
65 #include <machine/md_var.h>
66 #include <machine/pcb.h>
67 #include <machine/tls.h>
70 #include <vm/vm_extern.h>
72 #include <vm/vm_kern.h>
73 #include <vm/vm_map.h>
74 #include <vm/vm_page.h>
75 #include <vm/vm_pageout.h>
76 #include <vm/vm_param.h>
78 #include <vm/uma_int.h>
83 /* Duplicated from asm.h */
84 #if defined(__mips_o32)
89 #if defined(__mips_o32) || defined(__mips_o64)
90 #define CALLFRAME_SIZ (SZREG * (4 + 2))
91 #elif defined(__mips_n32) || defined(__mips_n64)
92 #define CALLFRAME_SIZ (SZREG * 4)
96 * Finish a fork operation, with process p2 nearly set up.
97 * Copy and update the pcb, set up the stack so that the child
98 * ready to run and return to user mode.
101 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2,int flags)
107 if ((flags & RFPROC) == 0)
109 /* It is assumed that the vm_thread_alloc called
110 * cpu_thread_alloc() before cpu_fork is called.
113 /* Point the pcb to the top of the stack */
116 /* Copy p1's pcb, note that in this case
117 * our pcb also includes the td_frame being copied
118 * too. The older mips2 code did an additional copy
119 * of the td_frame, for us that's not needed any
120 * longer (this copy does them both)
122 bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
124 /* Point mdproc and then copy over td1's contents
125 * md_proc is empty for MIPS
127 td2->td_md.md_flags = td1->td_md.md_flags & MDTD_FPUSED;
130 * Set up return-value registers as fork() libc stub expects.
132 td2->td_frame->v0 = 0;
133 td2->td_frame->v1 = 1;
134 td2->td_frame->a3 = 0;
136 if (td1 == PCPU_GET(fpcurthread))
137 MipsSaveCurFPState(td1);
139 pcb2->pcb_context[PCB_REG_RA] = (register_t)(intptr_t)fork_trampoline;
140 /* Make sp 64-bit aligned */
141 pcb2->pcb_context[PCB_REG_SP] = (register_t)(((vm_offset_t)td2->td_pcb &
142 ~(sizeof(__int64_t) - 1)) - CALLFRAME_SIZ);
143 pcb2->pcb_context[PCB_REG_S0] = (register_t)(intptr_t)fork_return;
144 pcb2->pcb_context[PCB_REG_S1] = (register_t)(intptr_t)td2;
145 pcb2->pcb_context[PCB_REG_S2] = (register_t)(intptr_t)td2->td_frame;
146 pcb2->pcb_context[PCB_REG_SR] = mips_rd_status() &
147 (MIPS_SR_KX | MIPS_SR_UX | MIPS_SR_INT_MASK);
149 * FREEBSD_DEVELOPERS_FIXME:
150 * Setup any other CPU-Specific registers (Not MIPS Standard)
151 * and/or bits in other standard MIPS registers (if CPU-Specific)
155 td2->td_md.md_tls = td1->td_md.md_tls;
156 td2->td_md.md_tls_tcb_offset = td1->td_md.md_tls_tcb_offset;
157 td2->td_md.md_saved_intr = MIPS_SR_INT_IE;
158 td2->td_md.md_spinlock_count = 1;
160 if (td1->td_md.md_flags & MDTD_COP2USED) {
161 if (td1->td_md.md_cop2owner == COP2_OWNER_USERLAND) {
162 if (td1->td_md.md_ucop2)
163 octeon_cop2_save(td1->td_md.md_ucop2);
165 panic("cpu_fork: ucop2 is NULL but COP2 is enabled");
168 if (td1->td_md.md_cop2)
169 octeon_cop2_save(td1->td_md.md_cop2);
171 panic("cpu_fork: cop2 is NULL but COP2 is enabled");
175 if (td1->td_md.md_cop2) {
176 td2->td_md.md_cop2 = octeon_cop2_alloc_ctx();
177 memcpy(td2->td_md.md_cop2, td1->td_md.md_cop2,
178 sizeof(*td1->td_md.md_cop2));
180 if (td1->td_md.md_ucop2) {
181 td2->td_md.md_ucop2 = octeon_cop2_alloc_ctx();
182 memcpy(td2->td_md.md_ucop2, td1->td_md.md_ucop2,
183 sizeof(*td1->td_md.md_ucop2));
185 td2->td_md.md_cop2owner = td1->td_md.md_cop2owner;
186 pcb2->pcb_context[PCB_REG_SR] |= MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX | MIPS_SR_SX;
187 /* Clear COP2 bits for userland & kernel */
188 td2->td_frame->sr &= ~MIPS_SR_COP_2_BIT;
189 pcb2->pcb_context[PCB_REG_SR] &= ~MIPS_SR_COP_2_BIT;
194 * Intercept the return address from a freshly forked process that has NOT
195 * been scheduled yet.
197 * This is needed to make kernel threads stay in kernel mode.
200 cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
203 * Note that the trap frame follows the args, so the function
204 * is really called like this: func(arg, frame);
206 td->td_pcb->pcb_context[PCB_REG_S0] = (register_t)(intptr_t)func;
207 td->td_pcb->pcb_context[PCB_REG_S1] = (register_t)(intptr_t)arg;
211 cpu_exit(struct thread *td)
216 cpu_thread_exit(struct thread *td)
219 if (PCPU_GET(fpcurthread) == td)
220 PCPU_GET(fpcurthread) = (struct thread *)0;
222 if (td->td_md.md_cop2)
223 memset(td->td_md.md_cop2, 0,
224 sizeof(*td->td_md.md_cop2));
225 if (td->td_md.md_ucop2)
226 memset(td->td_md.md_ucop2, 0,
227 sizeof(*td->td_md.md_ucop2));
232 cpu_thread_free(struct thread *td)
235 if (td->td_md.md_cop2)
236 octeon_cop2_free_ctx(td->td_md.md_cop2);
237 if (td->td_md.md_ucop2)
238 octeon_cop2_free_ctx(td->td_md.md_ucop2);
239 td->td_md.md_cop2 = NULL;
240 td->td_md.md_ucop2 = NULL;
245 cpu_thread_clean(struct thread *td)
250 cpu_thread_swapin(struct thread *td)
256 * The kstack may be at a different physical address now.
257 * Cache the PTEs for the Kernel stack in the machine dependent
258 * part of the thread struct so cpu_switch() can quickly map in
259 * the pcb struct and kernel stack.
261 for (i = 0; i < KSTACK_PAGES; i++) {
262 pte = pmap_pte(kernel_pmap, td->td_kstack + i * PAGE_SIZE);
263 td->td_md.md_upte[i] = *pte & ~TLBLO_SWBITS_MASK;
268 cpu_thread_swapout(struct thread *td)
273 cpu_thread_alloc(struct thread *td)
278 KASSERT((td->td_kstack & (1 << PAGE_SHIFT)) == 0, ("kernel stack must be aligned."));
279 td->td_pcb = (struct pcb *)(td->td_kstack +
280 td->td_kstack_pages * PAGE_SIZE) - 1;
281 td->td_frame = &td->td_pcb->pcb_regs;
283 for (i = 0; i < KSTACK_PAGES; i++) {
284 pte = pmap_pte(kernel_pmap, td->td_kstack + i * PAGE_SIZE);
285 td->td_md.md_upte[i] = *pte & ~TLBLO_SWBITS_MASK;
290 cpu_set_syscall_retval(struct thread *td, int error)
292 struct trapframe *locr0 = td->td_frame;
298 #if defined(__mips_n32) || defined(__mips_n64)
299 #ifdef COMPAT_FREEBSD32
300 if (code == SYS___syscall && SV_PROC_FLAG(td->td_proc, SV_ILP32))
304 if (code == SYS___syscall)
308 if (code == SYS_syscall)
310 else if (code == SYS___syscall) {
312 code = _QUAD_LOWWORD ? locr0->a1 : locr0->a0;
319 if (quad_syscall && code != SYS_lseek) {
321 * System call invoked through the
322 * SYS___syscall interface but the
323 * return value is really just 32
326 locr0->v0 = td->td_retval[0];
328 locr0->v1 = td->td_retval[0];
331 locr0->v0 = td->td_retval[0];
332 locr0->v1 = td->td_retval[1];
338 locr0->pc = td->td_pcb->pcb_tpc;
342 break; /* nothing to do */
345 if (quad_syscall && code != SYS_lseek) {
358 * Initialize machine state, mostly pcb and trap frame for a new
359 * thread, about to return to userspace. Put enough state in the new
360 * thread's PCB to get it to go back to the fork_return(), which
361 * finalizes the thread state and handles peculiarities of the first
362 * return to userspace for the new thread.
365 cpu_copy_thread(struct thread *td, struct thread *td0)
369 /* Point the pcb to the top of the stack. */
373 * Copy the upcall pcb. This loads kernel regs.
374 * Those not loaded individually below get their default
377 * XXXKSE It might be a good idea to simply skip this as
378 * the values of the other registers may be unimportant.
379 * This would remove any requirement for knowing the KSE
380 * at this time (see the matching comment below for
381 * more analysis) (need a good safe default).
382 * In MIPS, the trapframe is the first element of the PCB
383 * and gets copied when we copy the PCB. No separate copy
386 bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
389 * Set registers for trampoline to user mode.
392 pcb2->pcb_context[PCB_REG_RA] = (register_t)(intptr_t)fork_trampoline;
393 /* Make sp 64-bit aligned */
394 pcb2->pcb_context[PCB_REG_SP] = (register_t)(((vm_offset_t)td->td_pcb &
395 ~(sizeof(__int64_t) - 1)) - CALLFRAME_SIZ);
396 pcb2->pcb_context[PCB_REG_S0] = (register_t)(intptr_t)fork_return;
397 pcb2->pcb_context[PCB_REG_S1] = (register_t)(intptr_t)td;
398 pcb2->pcb_context[PCB_REG_S2] = (register_t)(intptr_t)td->td_frame;
399 /* Dont set IE bit in SR. sched lock release will take care of it */
400 pcb2->pcb_context[PCB_REG_SR] = mips_rd_status() &
401 (MIPS_SR_PX | MIPS_SR_KX | MIPS_SR_UX | MIPS_SR_INT_MASK);
404 * FREEBSD_DEVELOPERS_FIXME:
405 * Setup any other CPU-Specific registers (Not MIPS Standard)
409 /* Setup to release spin count in in fork_exit(). */
410 td->td_md.md_spinlock_count = 1;
411 td->td_md.md_saved_intr = MIPS_SR_INT_IE;
413 /* Maybe we need to fix this? */
414 td->td_md.md_saved_sr = ( (MIPS_SR_COP_2_BIT | MIPS_SR_COP_0_BIT) |
415 (MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX | MIPS_SR_SX) |
416 (MIPS_SR_INT_IE | MIPS_HARD_INT_MASK));
421 * Set that machine state for performing an upcall that starts
422 * the entry function with the given argument.
425 cpu_set_upcall(struct thread *td, void (*entry)(void *), void *arg,
428 struct trapframe *tf;
432 * At the point where a function is called, sp must be 8
433 * byte aligned[for compatibility with 64-bit CPUs]
434 * in ``See MIPS Run'' by D. Sweetman, p. 269
437 sp = (((intptr_t)stack->ss_sp + stack->ss_size) & ~0x7) -
441 * Set the trap frame to point at the beginning of the uts
445 bzero(tf, sizeof(struct trapframe));
447 tf->pc = (register_t)(intptr_t)entry;
449 * MIPS ABI requires T9 to be the same as PC
450 * in subroutine entry point
452 tf->t9 = (register_t)(intptr_t)entry;
453 tf->a0 = (register_t)(intptr_t)arg;
456 * Keep interrupt mask
458 td->td_frame->sr = MIPS_SR_KSU_USER | MIPS_SR_EXL | MIPS_SR_INT_IE |
459 (mips_rd_status() & MIPS_SR_INT_MASK);
460 #if defined(__mips_n32)
461 td->td_frame->sr |= MIPS_SR_PX;
462 #elif defined(__mips_n64)
463 td->td_frame->sr |= MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX;
465 /* tf->sr |= (ALL_INT_MASK & idle_mask) | SR_INT_ENAB; */
466 /**XXX the above may now be wrong -- mips2 implements this as panic */
468 * FREEBSD_DEVELOPERS_FIXME:
469 * Setup any other CPU-Specific registers (Not MIPS Standard)
475 * Implement the pre-zeroed page mechanism.
476 * This routine is called from the idle loop.
479 #define ZIDLE_LO(v) ((v) * 2 / 3)
480 #define ZIDLE_HI(v) ((v) * 4 / 5)
483 * Software interrupt handler for queued VM system processing.
489 if (busdma_swi_pending)
494 cpu_set_user_tls(struct thread *td, void *tls_base)
497 #if defined(__mips_n64) && defined(COMPAT_FREEBSD32)
498 if (td->td_proc && SV_PROC_FLAG(td->td_proc, SV_ILP32))
499 td->td_md.md_tls_tcb_offset = TLS_TP_OFFSET + TLS_TCB_SIZE32;
502 td->td_md.md_tls_tcb_offset = TLS_TP_OFFSET + TLS_TCB_SIZE;
503 td->td_md.md_tls = (char*)tls_base;
504 if (td == curthread && cpuinfo.userlocal_reg == true) {
505 mips_wr_userlocal((unsigned long)tls_base +
506 td->td_md.md_tls_tcb_offset);
515 #define DB_PRINT_REG(ptr, regname) \
516 db_printf(" %-12s %p\n", #regname, (void *)(intptr_t)((ptr)->regname))
518 #define DB_PRINT_REG_ARRAY(ptr, arrname, regname) \
519 db_printf(" %-12s %p\n", #regname, (void *)(intptr_t)((ptr)->arrname[regname]))
522 dump_trapframe(struct trapframe *trapframe)
525 db_printf("Trapframe at %p\n", trapframe);
527 DB_PRINT_REG(trapframe, zero);
528 DB_PRINT_REG(trapframe, ast);
529 DB_PRINT_REG(trapframe, v0);
530 DB_PRINT_REG(trapframe, v1);
531 DB_PRINT_REG(trapframe, a0);
532 DB_PRINT_REG(trapframe, a1);
533 DB_PRINT_REG(trapframe, a2);
534 DB_PRINT_REG(trapframe, a3);
535 #if defined(__mips_n32) || defined(__mips_n64)
536 DB_PRINT_REG(trapframe, a4);
537 DB_PRINT_REG(trapframe, a5);
538 DB_PRINT_REG(trapframe, a6);
539 DB_PRINT_REG(trapframe, a7);
540 DB_PRINT_REG(trapframe, t0);
541 DB_PRINT_REG(trapframe, t1);
542 DB_PRINT_REG(trapframe, t2);
543 DB_PRINT_REG(trapframe, t3);
545 DB_PRINT_REG(trapframe, t0);
546 DB_PRINT_REG(trapframe, t1);
547 DB_PRINT_REG(trapframe, t2);
548 DB_PRINT_REG(trapframe, t3);
549 DB_PRINT_REG(trapframe, t4);
550 DB_PRINT_REG(trapframe, t5);
551 DB_PRINT_REG(trapframe, t6);
552 DB_PRINT_REG(trapframe, t7);
554 DB_PRINT_REG(trapframe, s0);
555 DB_PRINT_REG(trapframe, s1);
556 DB_PRINT_REG(trapframe, s2);
557 DB_PRINT_REG(trapframe, s3);
558 DB_PRINT_REG(trapframe, s4);
559 DB_PRINT_REG(trapframe, s5);
560 DB_PRINT_REG(trapframe, s6);
561 DB_PRINT_REG(trapframe, s7);
562 DB_PRINT_REG(trapframe, t8);
563 DB_PRINT_REG(trapframe, t9);
564 DB_PRINT_REG(trapframe, k0);
565 DB_PRINT_REG(trapframe, k1);
566 DB_PRINT_REG(trapframe, gp);
567 DB_PRINT_REG(trapframe, sp);
568 DB_PRINT_REG(trapframe, s8);
569 DB_PRINT_REG(trapframe, ra);
570 DB_PRINT_REG(trapframe, sr);
571 DB_PRINT_REG(trapframe, mullo);
572 DB_PRINT_REG(trapframe, mulhi);
573 DB_PRINT_REG(trapframe, badvaddr);
574 DB_PRINT_REG(trapframe, cause);
575 DB_PRINT_REG(trapframe, pc);
578 DB_SHOW_COMMAND(pcb, ddb_dump_pcb)
582 struct trapframe *trapframe;
584 /* Determine which thread to examine. */
586 td = db_lookup_thread(addr, true);
592 db_printf("Thread %d at %p\n", td->td_tid, td);
594 db_printf("PCB at %p\n", pcb);
596 trapframe = &pcb->pcb_regs;
597 dump_trapframe(trapframe);
599 db_printf("PCB Context:\n");
600 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S0);
601 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S1);
602 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S2);
603 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S3);
604 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S4);
605 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S5);
606 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S6);
607 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S7);
608 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_SP);
609 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_S8);
610 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_RA);
611 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_SR);
612 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_GP);
613 DB_PRINT_REG_ARRAY(pcb, pcb_context, PCB_REG_PC);
615 db_printf("PCB onfault = %p\n", pcb->pcb_onfault);
616 db_printf("md_saved_intr = 0x%0lx\n", (long)td->td_md.md_saved_intr);
617 db_printf("md_spinlock_count = %d\n", td->td_md.md_spinlock_count);
619 if (td->td_frame != trapframe) {
620 db_printf("td->td_frame %p is not the same as pcb_regs %p\n",
621 td->td_frame, trapframe);
626 * Dump the trapframe beginning at address specified by first argument.
628 DB_SHOW_COMMAND(trapframe, ddb_dump_trapframe)
634 dump_trapframe((struct trapframe *)addr);