Annotation of sys/arch/sparc/sparc/vm_machdep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: vm_machdep.c,v 1.49 2007/06/20 17:29:36 miod Exp $ */
! 2: /* $NetBSD: vm_machdep.c,v 1.30 1997/03/10 23:55:40 pk Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1996
! 6: * The President and Fellows of Harvard College. All rights reserved.
! 7: * Copyright (c) 1992, 1993
! 8: * The Regents of the University of California. All rights reserved.
! 9: *
! 10: * This software was developed by the Computer Systems Engineering group
! 11: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 12: * contributed to Berkeley.
! 13: *
! 14: * All advertising materials mentioning features or use of this software
! 15: * must display the following acknowledgement:
! 16: * This product includes software developed by the University of
! 17: * California, Lawrence Berkeley Laboratory.
! 18: * This product includes software developed by Harvard University.
! 19: *
! 20: * Redistribution and use in source and binary forms, with or without
! 21: * modification, are permitted provided that the following conditions
! 22: * are met:
! 23: * 1. Redistributions of source code must retain the above copyright
! 24: * notice, this list of conditions and the following disclaimer.
! 25: * 2. Redistributions in binary form must reproduce the above copyright
! 26: * notice, this list of conditions and the following disclaimer in the
! 27: * documentation and/or other materials provided with the distribution.
! 28: * 3. All advertising materials mentioning features or use of this software
! 29: * must display the following acknowledgement:
! 30: * This product includes software developed by Harvard University.
! 31: * This product includes software developed by the University of
! 32: * California, Berkeley and its contributors.
! 33: * 4. Neither the name of the University nor the names of its contributors
! 34: * may be used to endorse or promote products derived from this software
! 35: * without specific prior written permission.
! 36: *
! 37: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 38: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 39: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 40: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 41: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 42: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 43: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 44: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 45: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 46: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 47: * SUCH DAMAGE.
! 48: *
! 49: * @(#)vm_machdep.c 8.2 (Berkeley) 9/23/93
! 50: */
! 51:
! 52: #include <sys/param.h>
! 53: #include <sys/systm.h>
! 54: #include <sys/proc.h>
! 55: #include <sys/signalvar.h>
! 56: #include <sys/user.h>
! 57: #include <sys/core.h>
! 58: #include <sys/malloc.h>
! 59: #include <sys/buf.h>
! 60: #include <sys/exec.h>
! 61: #include <sys/vnode.h>
! 62: #include <sys/extent.h>
! 63:
! 64: #include <uvm/uvm_extern.h>
! 65:
! 66: #include <machine/cpu.h>
! 67: #include <machine/frame.h>
! 68: #include <machine/trap.h>
! 69:
! 70: #include <sparc/sparc/cpuvar.h>
! 71:
! 72: /*
! 73: * Wrapper for dvma_mapin() in kernel space,
! 74: * so drivers need not include VM goo to get at kernel_map.
! 75: */
! 76: caddr_t
! 77: kdvma_mapin(va, len, canwait)
! 78: caddr_t va;
! 79: int len, canwait;
! 80: {
! 81: return ((caddr_t)dvma_mapin(kernel_map, (vaddr_t)va, len, canwait));
! 82: }
! 83:
! 84: #if defined(SUN4M)
! 85: extern int has_iocache;
! 86: #endif
! 87:
! 88: caddr_t
! 89: dvma_malloc_space(len, kaddr, flags, space)
! 90: size_t len;
! 91: void *kaddr;
! 92: int flags;
! 93: {
! 94: vaddr_t kva;
! 95: vaddr_t dva;
! 96:
! 97: len = round_page(len);
! 98: kva = (vaddr_t)malloc(len, M_DEVBUF, flags);
! 99: if (kva == NULL)
! 100: return (NULL);
! 101:
! 102: #if defined(SUN4M)
! 103: if (!has_iocache)
! 104: #endif
! 105: kvm_uncache((caddr_t)kva, atop(len));
! 106:
! 107: *(vaddr_t *)kaddr = kva;
! 108: dva = dvma_mapin_space(kernel_map, kva, len, (flags & M_NOWAIT) ? 0 : 1, space);
! 109: if (dva == NULL) {
! 110: free((void *)kva, M_DEVBUF);
! 111: return (NULL);
! 112: }
! 113: return (caddr_t)dva;
! 114: }
! 115:
! 116: void
! 117: dvma_free(dva, len, kaddr)
! 118: caddr_t dva;
! 119: size_t len;
! 120: void *kaddr;
! 121: {
! 122: vaddr_t kva = *(vaddr_t *)kaddr;
! 123:
! 124: len = round_page(len);
! 125:
! 126: dvma_mapout((vaddr_t)dva, kva, len);
! 127: /*
! 128: * Even if we're freeing memory here, we can't be sure that it will
! 129: * be unmapped, so we must recache the memory range to avoid impact
! 130: * on other kernel subsystems.
! 131: */
! 132: #if defined(SUN4M)
! 133: if (!has_iocache)
! 134: #endif
! 135: kvm_recache(kaddr, atop(len));
! 136: free((void *)kva, M_DEVBUF);
! 137: }
! 138:
! 139: u_long dvma_cachealign = 0;
! 140:
! 141: /*
! 142: * Map a range [va, va+len] of wired virtual addresses in the given map
! 143: * to a kernel address in DVMA space.
! 144: */
! 145: vaddr_t
! 146: dvma_mapin_space(map, va, len, canwait, space)
! 147: struct vm_map *map;
! 148: vaddr_t va;
! 149: int len, canwait, space;
! 150: {
! 151: vaddr_t kva, tva;
! 152: int npf, s;
! 153: paddr_t pa;
! 154: vaddr_t off;
! 155: vaddr_t ova;
! 156: int olen;
! 157: int error;
! 158:
! 159: if (dvma_cachealign == 0)
! 160: dvma_cachealign = PAGE_SIZE;
! 161:
! 162: ova = va;
! 163: olen = len;
! 164:
! 165: off = va & PAGE_MASK;
! 166: va &= ~PAGE_MASK;
! 167: len = round_page(len + off);
! 168: npf = btoc(len);
! 169:
! 170: s = splhigh();
! 171: if (space & M_SPACE_D24)
! 172: error = extent_alloc_subregion(dvmamap_extent,
! 173: DVMA_D24_BASE, DVMA_D24_END, len, dvma_cachealign,
! 174: va & (dvma_cachealign - 1), 0,
! 175: canwait ? EX_WAITSPACE : EX_NOWAIT, &tva);
! 176: else
! 177: error = extent_alloc(dvmamap_extent, len, dvma_cachealign,
! 178: va & (dvma_cachealign - 1), 0,
! 179: canwait ? EX_WAITSPACE : EX_NOWAIT, &tva);
! 180: splx(s);
! 181: if (error)
! 182: return NULL;
! 183: kva = tva;
! 184:
! 185: while (npf--) {
! 186: if (pmap_extract(vm_map_pmap(map), va, &pa) == FALSE)
! 187: panic("dvma_mapin: null page frame");
! 188: pa = trunc_page(pa);
! 189:
! 190: #if defined(SUN4M)
! 191: if (CPU_ISSUN4M) {
! 192: iommu_enter(tva, pa);
! 193: } else
! 194: #endif
! 195: {
! 196: /*
! 197: * pmap_enter distributes this mapping to all
! 198: * contexts... maybe we should avoid this extra work
! 199: */
! 200: #ifdef notyet
! 201: #if defined(SUN4)
! 202: if (have_iocache)
! 203: pa |= PG_IOC;
! 204: #endif
! 205: #endif
! 206: /* XXX - this should probably be pmap_kenter */
! 207: pmap_enter(pmap_kernel(), tva, pa | PMAP_NC,
! 208: VM_PROT_READ | VM_PROT_WRITE, PMAP_WIRED);
! 209: }
! 210:
! 211: tva += PAGE_SIZE;
! 212: va += PAGE_SIZE;
! 213: }
! 214: pmap_update(pmap_kernel());
! 215:
! 216: /*
! 217: * XXX Only have to do this on write.
! 218: */
! 219: if (CACHEINFO.c_vactype == VAC_WRITEBACK) /* XXX */
! 220: cpuinfo.cache_flush((caddr_t)ova, olen); /* XXX */
! 221:
! 222: return kva + off;
! 223: }
! 224:
! 225: /*
! 226: * Remove double map of `va' in DVMA space at `kva'.
! 227: */
! 228: void
! 229: dvma_mapout(kva, va, len)
! 230: vaddr_t kva, va;
! 231: int len;
! 232: {
! 233: int s, off;
! 234: int error;
! 235: int klen;
! 236:
! 237: off = (int)kva & PGOFSET;
! 238: kva -= off;
! 239: klen = round_page(len + off);
! 240:
! 241: #if defined(SUN4M)
! 242: if (CPU_ISSUN4M)
! 243: iommu_remove(kva, klen);
! 244: else
! 245: #endif
! 246: {
! 247: pmap_remove(pmap_kernel(), kva, kva + klen);
! 248: pmap_update(pmap_kernel());
! 249: }
! 250:
! 251: s = splhigh();
! 252: error = extent_free(dvmamap_extent, kva, klen, EX_NOWAIT);
! 253: if (error)
! 254: printf("dvma_mapout: extent_free failed\n");
! 255: splx(s);
! 256:
! 257: if (CACHEINFO.c_vactype != VAC_NONE)
! 258: cpuinfo.cache_flush((caddr_t)va, len);
! 259: }
! 260:
! 261: /*
! 262: * Map an IO request into kernel virtual address space.
! 263: */
! 264: void
! 265: vmapbuf(struct buf *bp, vsize_t sz)
! 266: {
! 267: vaddr_t uva, kva;
! 268: vsize_t size, off;
! 269: struct pmap *pmap;
! 270: paddr_t pa;
! 271:
! 272: #ifdef DIAGNOSTIC
! 273: if ((bp->b_flags & B_PHYS) == 0)
! 274: panic("vmapbuf");
! 275: #endif
! 276: pmap = vm_map_pmap(&bp->b_proc->p_vmspace->vm_map);
! 277:
! 278: bp->b_saveaddr = bp->b_data;
! 279: uva = trunc_page((vaddr_t)bp->b_data);
! 280: off = (vaddr_t)bp->b_data - uva;
! 281: size = round_page(off + sz);
! 282: /*
! 283: * Note that this is an expanded version of:
! 284: * kva = uvm_km_valloc_wait(kernel_map, size);
! 285: * We do it on our own here to be able to specify an offset to uvm_map
! 286: * so that we can get all benefits of PMAP_PREFER.
! 287: */
! 288: kva = uvm_km_valloc_prefer_wait(kernel_map, size, uva);
! 289: bp->b_data = (caddr_t)(kva + off);
! 290:
! 291: while (size > 0) {
! 292: if (pmap_extract(pmap, uva, &pa) == FALSE)
! 293: panic("vmapbuf: null page frame");
! 294:
! 295: /*
! 296: * Don't enter uncached if cache is mandatory.
! 297: *
! 298: * XXX - there are probably other cases where we don't need
! 299: * to uncache, but for now we're conservative.
! 300: */
! 301: if (!(cpuinfo.flags & CPUFLG_CACHE_MANDATORY))
! 302: pa |= PMAP_NC;
! 303:
! 304: pmap_enter(pmap_kernel(), kva, pa,
! 305: VM_PROT_READ | VM_PROT_WRITE, PMAP_WIRED);
! 306:
! 307: uva += PAGE_SIZE;
! 308: kva += PAGE_SIZE;
! 309: size -= PAGE_SIZE;
! 310: }
! 311: pmap_update(pmap_kernel());
! 312: }
! 313:
! 314: /*
! 315: * Free the io map addresses associated with this IO operation.
! 316: */
! 317: void
! 318: vunmapbuf(bp, sz)
! 319: register struct buf *bp;
! 320: vsize_t sz;
! 321: {
! 322: register vaddr_t kva;
! 323: register vsize_t size, off;
! 324:
! 325: if ((bp->b_flags & B_PHYS) == 0)
! 326: panic("vunmapbuf");
! 327:
! 328: kva = trunc_page((vaddr_t)bp->b_data);
! 329: off = (vaddr_t)bp->b_data - kva;
! 330: size = round_page(sz + off);
! 331:
! 332: pmap_remove(pmap_kernel(), kva, kva + size);
! 333: pmap_update(pmap_kernel());
! 334: uvm_km_free_wakeup(kernel_map, kva, size);
! 335: bp->b_data = bp->b_saveaddr;
! 336: bp->b_saveaddr = NULL;
! 337: if (CACHEINFO.c_vactype != VAC_NONE)
! 338: cpuinfo.cache_flush(bp->b_data, bp->b_bcount - bp->b_resid);
! 339: }
! 340:
! 341:
! 342: /*
! 343: * The offset of the topmost frame in the kernel stack.
! 344: */
! 345: #define TOPFRAMEOFF (USPACE-sizeof(struct trapframe)-sizeof(struct frame))
! 346:
! 347: /*
! 348: * Finish a fork operation, with process p2 nearly set up.
! 349: * Copy and update the pcb, making the child ready to run, and marking
! 350: * it so that it can return differently than the parent.
! 351: *
! 352: * This function relies on the fact that the pcb is
! 353: * the first element in struct user.
! 354: */
! 355: void
! 356: cpu_fork(p1, p2, stack, stacksize, func, arg)
! 357: struct proc *p1, *p2;
! 358: void *stack;
! 359: size_t stacksize;
! 360: void (*func)(void *);
! 361: void *arg;
! 362: {
! 363: struct pcb *opcb = &p1->p_addr->u_pcb;
! 364: struct pcb *npcb = &p2->p_addr->u_pcb;
! 365: struct trapframe *tf2;
! 366: struct rwindow *rp;
! 367:
! 368: /*
! 369: * Save all user registers to p1's stack or, in the case of
! 370: * user registers and invalid stack pointers, to opcb.
! 371: * We then copy the whole pcb to p2; when switch() selects p2
! 372: * to run, it will run at the `proc_trampoline' stub, rather
! 373: * than returning at the copying code below.
! 374: *
! 375: * If process p1 has an FPU state, we must copy it. If it is
! 376: * the FPU user, we must save the FPU state first.
! 377: */
! 378:
! 379: if (p1 == curproc) {
! 380: write_user_windows();
! 381: opcb->pcb_psr = getpsr();
! 382: }
! 383: #ifdef DIAGNOSTIC
! 384: else if (p1 != &proc0)
! 385: panic("cpu_fork: curproc");
! 386: #endif
! 387:
! 388: bcopy((caddr_t)opcb, (caddr_t)npcb, sizeof(struct pcb));
! 389: if (p1->p_md.md_fpstate) {
! 390: if (p1 == cpuinfo.fpproc)
! 391: savefpstate(p1->p_md.md_fpstate);
! 392: p2->p_md.md_fpstate = malloc(sizeof(struct fpstate),
! 393: M_SUBPROC, M_WAITOK);
! 394: bcopy(p1->p_md.md_fpstate, p2->p_md.md_fpstate,
! 395: sizeof(struct fpstate));
! 396: } else
! 397: p2->p_md.md_fpstate = NULL;
! 398:
! 399: /*
! 400: * Setup (kernel) stack frame that will by-pass the child
! 401: * out of the kernel. (The trap frame invariably resides at
! 402: * the tippity-top of the u. area.)
! 403: */
! 404: tf2 = p2->p_md.md_tf = (struct trapframe *)
! 405: ((int)npcb + USPACE - sizeof(*tf2));
! 406:
! 407: /* Copy parent's trapframe */
! 408: *tf2 = *(struct trapframe *)((int)opcb + USPACE - sizeof(*tf2));
! 409:
! 410: /*
! 411: * If specified, give the child a different stack.
! 412: */
! 413: if (stack != NULL)
! 414: tf2->tf_out[6] = (u_int)stack + stacksize;
! 415:
! 416: /* Duplicate efforts of syscall(), but slightly differently */
! 417: if (tf2->tf_global[1] & SYSCALL_G2RFLAG) {
! 418: /* jmp %g2 (or %g7, deprecated) on success */
! 419: tf2->tf_npc = tf2->tf_global[2];
! 420: } else {
! 421: /*
! 422: * old system call convention: clear C on success
! 423: * note: proc_trampoline() sets a fresh psr when
! 424: * returning to user mode.
! 425: */
! 426: /*tf2->tf_psr &= ~PSR_C; -* success */
! 427: }
! 428:
! 429: /* Set return values in child mode */
! 430: tf2->tf_out[0] = 0;
! 431: tf2->tf_out[1] = 1;
! 432:
! 433: /* Skip trap instruction. */
! 434: tf2->tf_pc = tf2->tf_npc;
! 435: tf2->tf_npc += 4;
! 436:
! 437: /* Construct kernel frame to return to in cpu_switch() */
! 438: rp = (struct rwindow *)((u_int)npcb + TOPFRAMEOFF);
! 439: rp->rw_local[0] = (int)func; /* Function to call */
! 440: rp->rw_local[1] = (int)arg; /* and its argument */
! 441:
! 442: npcb->pcb_pc = (int)proc_trampoline - 8;
! 443: npcb->pcb_sp = (int)rp;
! 444: npcb->pcb_psr &= ~PSR_CWP; /* Run in window #0 */
! 445: npcb->pcb_wim = 1; /* Fence at window #1 */
! 446:
! 447: }
! 448:
! 449: /*
! 450: * cpu_exit is called as the last action during exit.
! 451: *
! 452: * We clean up a little and then call switchexit() with the old proc
! 453: * as an argument. switchexit() switches to the idle context, schedules
! 454: * the old vmspace and stack to be freed, then selects a new process to
! 455: * run.
! 456: */
! 457: void
! 458: cpu_exit(p)
! 459: struct proc *p;
! 460: {
! 461: register struct fpstate *fs;
! 462:
! 463: if ((fs = p->p_md.md_fpstate) != NULL) {
! 464: if (p == cpuinfo.fpproc) {
! 465: savefpstate(fs);
! 466: cpuinfo.fpproc = NULL;
! 467: }
! 468: free((void *)fs, M_SUBPROC);
! 469: }
! 470:
! 471: switchexit(p);
! 472: /* NOTREACHED */
! 473: }
! 474:
! 475: /*
! 476: * cpu_coredump is called to write a core dump header.
! 477: * (should this be defined elsewhere? machdep.c?)
! 478: */
! 479: int
! 480: cpu_coredump(p, vp, cred, chdr)
! 481: struct proc *p;
! 482: struct vnode *vp;
! 483: struct ucred *cred;
! 484: struct core *chdr;
! 485: {
! 486: int error;
! 487: struct md_coredump md_core;
! 488: struct coreseg cseg;
! 489:
! 490: CORE_SETMAGIC(*chdr, COREMAGIC, MID_SPARC, 0);
! 491: chdr->c_hdrsize = ALIGN(sizeof(*chdr));
! 492: chdr->c_seghdrsize = ALIGN(sizeof(cseg));
! 493: chdr->c_cpusize = sizeof(md_core);
! 494:
! 495: md_core.md_tf = *p->p_md.md_tf;
! 496: md_core.md_wcookie = p->p_addr->u_pcb.pcb_wcookie;
! 497: if (p->p_md.md_fpstate) {
! 498: if (p == cpuinfo.fpproc)
! 499: savefpstate(p->p_md.md_fpstate);
! 500: md_core.md_fpstate = *p->p_md.md_fpstate;
! 501: } else
! 502: bzero((caddr_t)&md_core.md_fpstate, sizeof(struct fpstate));
! 503:
! 504: CORE_SETMAGIC(cseg, CORESEGMAGIC, MID_SPARC, CORE_CPU);
! 505: cseg.c_addr = 0;
! 506: cseg.c_size = chdr->c_cpusize;
! 507: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&cseg, chdr->c_seghdrsize,
! 508: (off_t)chdr->c_hdrsize, UIO_SYSSPACE,
! 509: IO_NODELOCKED|IO_UNIT, cred, NULL, p);
! 510: if (error)
! 511: return error;
! 512:
! 513: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&md_core, sizeof(md_core),
! 514: (off_t)(chdr->c_hdrsize + chdr->c_seghdrsize), UIO_SYSSPACE,
! 515: IO_NODELOCKED|IO_UNIT, cred, NULL, p);
! 516: if (!error)
! 517: chdr->c_nseg++;
! 518:
! 519: return error;
! 520: }
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