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
5 * Copyright (c) 2001 Jake Burkholder.
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department, and William Jolitz.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
41 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
42 * from: FreeBSD: src/sys/i386/i386/vm_machdep.c,v 1.167 2001/07/12
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/malloc.h>
54 #include <sys/kernel.h>
55 #include <sys/linker_set.h>
57 #include <sys/mutex.h>
58 #include <sys/sf_buf.h>
59 #include <sys/sysctl.h>
60 #include <sys/sysent.h>
61 #include <sys/unistd.h>
62 #include <sys/vmmeter.h>
64 #include <dev/ofw/openfirm.h>
67 #include <vm/vm_extern.h>
69 #include <vm/vm_kern.h>
70 #include <vm/vm_map.h>
71 #include <vm/vm_page.h>
72 #include <vm/vm_pageout.h>
73 #include <vm/vm_param.h>
75 #include <vm/uma_int.h>
77 #include <machine/bus.h>
78 #include <machine/cpu.h>
79 #include <machine/fp.h>
80 #include <machine/fsr.h>
81 #include <machine/frame.h>
82 #include <machine/md_var.h>
83 #include <machine/ofw_machdep.h>
84 #include <machine/ofw_mem.h>
85 #include <machine/pcb.h>
86 #include <machine/tlb.h>
87 #include <machine/tstate.h>
88 #include <machine/wstate.h>
89 #include <machine/asm.h>
92 cpu_exit(struct thread *td)
97 p->p_md.md_sigtramp = NULL;
98 if (p->p_md.md_utrap != NULL) {
99 utrap_free(p->p_md.md_utrap);
100 p->p_md.md_utrap = NULL;
105 cpu_thread_exit(struct thread *td)
110 cpu_thread_clean(struct thread *td)
115 cpu_thread_alloc(struct thread *td)
119 pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE -
120 sizeof(struct pcb)) & ~0x3fUL);
121 pcb->pcb_kstack = (uint64_t)(((char *)pcb) - (CCFSZ + SPOFF));
123 td->td_frame = (struct trapframe *)pcb - 1;
124 pcb = (struct pcb *)TLB_PHYS_TO_DIRECT(vtophys((vm_offset_t)pcb));
125 KASSERT(pcb > (struct pcb *)VM_MIN_DIRECT_ADDRESS,("pcb is NULL"));
131 cpu_thread_free(struct thread *td)
136 cpu_thread_swapin(struct thread *td)
141 cpu_thread_swapout(struct thread *td)
146 cpu_set_syscall_retval(struct thread *td, int error)
151 td->td_frame->tf_out[0] = td->td_retval[0];
152 td->td_frame->tf_out[1] = td->td_retval[1];
153 td->td_frame->tf_tstate &= ~TSTATE_XCC_C;
158 * Undo the tpc advancement we have done on syscall
159 * enter, we want to reexecute the system call.
161 td->td_frame->tf_tpc = td->td_pcb->pcb_tpc;
162 td->td_frame->tf_tnpc -= 4;
169 if (td->td_proc->p_sysent->sv_errsize) {
170 if (error >= td->td_proc->p_sysent->sv_errsize)
171 error = -1; /* XXX */
173 error = td->td_proc->p_sysent->sv_errtbl[error];
175 td->td_frame->tf_out[0] = error;
176 td->td_frame->tf_tstate |= TSTATE_XCC_C;
182 cpu_set_upcall(struct thread *td, struct thread *td0)
184 struct trapframe *tf;
188 bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
193 fr = (struct frame *)tf - 1;
194 fr->fr_local[0] = (u_long)fork_return;
195 fr->fr_local[1] = (u_long)td;
196 fr->fr_local[2] = (u_long)tf;
197 pcb->pcb_pc = (u_long)fork_trampoline - 8;
198 pcb->pcb_sp = (u_long)fr - SPOFF;
200 /* Setup to release spin count in fork_exit(). */
201 td->td_md.md_spinlock_count = 1;
202 td->td_md.md_saved_pil = 0;
206 cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg,
209 struct trapframe *tf;
215 sp = (uint64_t)stack->ss_sp + stack->ss_size;
216 tf->tf_out[0] = (uint64_t)arg;
217 tf->tf_out[6] = sp - SPOFF - sizeof(struct frame);
218 tf->tf_tpc = (uint64_t)entry;
219 tf->tf_tnpc = tf->tf_tpc + 4;
221 td->td_retval[0] = tf->tf_out[0];
222 td->td_retval[1] = tf->tf_out[1];
226 cpu_set_user_tls(struct thread *td, void *tls_base)
231 td->td_frame->tf_global[7] = (uint64_t) tls_base;
236 * Finish a fork operation, with process p2 nearly set up.
237 * Copy and update the pcb, set up the stack so that the child
238 * ready to run and return to user mode.
241 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
243 struct trapframe *tf;
246 struct pcb *pcb2, *pcb2orig;
251 KASSERT(td1 == curthread || td1 == &thread0,
252 ("cpu_fork: p1 not curproc and not proc0"));
254 if ((flags & RFPROC) == 0)
257 p2->p_md.md_sigtramp = td1->td_proc->p_md.md_sigtramp;
258 p2->p_md.md_utrap = utrap_hold(td1->td_proc->p_md.md_utrap);
260 /* The pcb must be aligned on a 64-byte boundary. */
263 pcb2orig = (struct pcb *)((td2->td_kstack + td2->td_kstack_pages *
264 PAGE_SIZE - sizeof(struct pcb)) & ~0x3fUL);
265 pcb2 = (struct pcb *)TLB_PHYS_TO_DIRECT(vtophys((vm_offset_t)pcb2orig));
270 * Ensure that p1's pcb is up to date.
273 if ((td1->td_frame->tf_fprs & FPRS_FEF) != 0)
274 savefpctx(pcb1->pcb_ufp);
276 /* Make sure the copied windows are spilled. */
278 /* Copy the pcb (this will copy the windows saved in the pcb, too). */
279 bcopy(pcb1, pcb2, sizeof(*pcb1));
282 * If we're creating a new user process and we're sharing the address
283 * space, the parent's top most frame must be saved in the pcb. The
284 * child will pop the frame when it returns to user mode, and may
285 * overwrite it with its own data causing much suffering for the
286 * parent. We check if its already in the pcb, and if not copy it
287 * in. Its unlikely that the copyin will fail, but if so there's not
288 * much we can do. The parent will likely crash soon anyway in that
291 if ((flags & RFMEM) != 0 && td1 != &thread0) {
292 sp = td1->td_frame->tf_sp;
293 for (i = 0; i < pcb1->pcb_nsaved; i++) {
294 if (pcb1->pcb_rwsp[i] == sp)
297 if (i == pcb1->pcb_nsaved) {
298 error = copyin((caddr_t)sp + SPOFF, &pcb1->pcb_rw[i],
299 sizeof(struct rwindow));
301 pcb1->pcb_rwsp[i] = sp;
308 * Create a new fresh stack for the new process.
309 * Copy the trap frame for the return to user mode as if from a
310 * syscall. This copies most of the user mode register values.
312 tf = (struct trapframe *)pcb2orig - 1;
313 bcopy(td1->td_frame, tf, sizeof(*tf));
315 tf->tf_out[0] = 0; /* Child returns zero */
317 tf->tf_tstate &= ~TSTATE_XCC_C; /* success */
319 tf->tf_wstate = WSTATE_U64;
323 fp = (struct frame *)tf - 1;
324 fp->fr_local[0] = (u_long)fork_return;
325 fp->fr_local[1] = (u_long)td2;
326 fp->fr_local[2] = (u_long)tf;
327 /* Terminate stack traces at this frame. */
328 fp->fr_pc = fp->fr_fp = 0;
329 pcb2->pcb_sp = (u_long)fp - SPOFF;
330 pcb2->pcb_pc = (u_long)fork_trampoline - 8;
331 pcb2->pcb_kstack = (uint64_t)(((char *)pcb2orig) - (CCFSZ + SPOFF));
333 /* Setup to release spin count in fork_exit(). */
334 td2->td_md.md_spinlock_count = 1;
335 td2->td_md.md_saved_pil = 0;
338 * Now, cpu_switch() can schedule the new process.
345 static char bspec[64] = "";
360 if ((chosen = OF_finddevice("/chosen")) != 0) {
361 if (OF_getprop(chosen, "bootpath", bspec, sizeof(bspec)) == -1)
363 bspec[sizeof(bspec) - 1] = '\0';
369 * Intercept the return address from a freshly forked process that has NOT
370 * been scheduled yet.
372 * This is needed to make kernel threads stay in kernel mode.
375 cpu_set_fork_handler(struct thread *td, void (*func)(void *), void *arg)
381 fp = (struct frame *)(pcb->pcb_sp + SPOFF);
382 fp->fr_local[0] = (u_long)func;
383 fp->fr_local[1] = (u_long)arg;
387 is_physical_memory(vm_paddr_t addr)
389 struct ofw_mem_region *mr;
391 for (mr = sparc64_memreg; mr < sparc64_memreg + sparc64_nmemreg; mr++)
392 if (addr >= mr->mr_start && addr < mr->mr_start + mr->mr_size)
398 * Get an sf_buf from the freelist. Will block if none are available.
401 sf_buf_alloc(struct vm_page *m, int flags)
403 return ((struct sf_buf *)m);
407 * Release resources back to the system.
410 sf_buf_free(struct sf_buf *sf)
419 * Nothing to do here yet - busdma bounce buffers are not yet
425 uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
427 static vm_pindex_t color;
434 *flags = UMA_SLAB_PRIV;
436 if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
437 pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
439 pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
442 pflags |= VM_ALLOC_ZERO;
445 m = vm_page_alloc(NULL, color++, pflags | VM_ALLOC_NOOBJ);
455 pa = VM_PAGE_TO_PHYS(m);
456 va = (void *)TLB_PHYS_TO_DIRECT(pa);
457 if ((wait & M_ZERO) && ((m->flags & PG_ZERO) == 0))
458 hwblkclr((void *)TLB_PHYS_TO_DIRECT(pa), PAGE_SIZE);
463 uma_small_free(void *mem, int size, u_int8_t flags)
467 m = PHYS_TO_VM_PAGE(TLB_DIRECT_TO_PHYS((vm_offset_t)mem));
470 atomic_subtract_int(&cnt.v_wire_count, 1);