Annotation of sys/arch/mac68k/mac68k/vm_machdep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: vm_machdep.c,v 1.39 2007/05/27 20:59:25 miod Exp $ */
! 2: /* $NetBSD: vm_machdep.c,v 1.29 1998/07/28 18:34:55 thorpej Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1988 University of Utah.
! 6: * Copyright (c) 1982, 1986, 1990, 1993
! 7: * The Regents of the University of California. All rights reserved.
! 8: *
! 9: * This code is derived from software contributed to Berkeley by
! 10: * the Systems Programming Group of the University of Utah Computer
! 11: * Science Department.
! 12: *
! 13: * Redistribution and use in source and binary forms, with or without
! 14: * modification, are permitted provided that the following conditions
! 15: * are met:
! 16: * 1. Redistributions of source code must retain the above copyright
! 17: * notice, this list of conditions and the following disclaimer.
! 18: * 2. Redistributions in binary form must reproduce the above copyright
! 19: * notice, this list of conditions and the following disclaimer in the
! 20: * documentation and/or other materials provided with the distribution.
! 21: * 3. Neither the name of the University nor the names of its contributors
! 22: * may be used to endorse or promote products derived from this software
! 23: * without specific prior written permission.
! 24: *
! 25: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 26: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 27: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 28: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 29: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 30: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 31: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 32: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 33: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 34: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 35: * SUCH DAMAGE.
! 36: */
! 37: /*
! 38: * from: Utah $Hdr: vm_machdep.c 1.21 91/04/06$
! 39: *
! 40: * @(#)vm_machdep.c 8.6 (Berkeley) 1/12/94
! 41: */
! 42:
! 43: #include <sys/param.h>
! 44: #include <sys/systm.h>
! 45: #include <sys/proc.h>
! 46: #include <sys/signalvar.h>
! 47: #include <sys/malloc.h>
! 48: #include <sys/buf.h>
! 49: #include <sys/user.h>
! 50: #include <sys/vnode.h>
! 51: #include <sys/core.h>
! 52: #include <sys/exec.h>
! 53: #include <sys/ptrace.h>
! 54:
! 55: #include <uvm/uvm_extern.h>
! 56:
! 57: #include <machine/cpu.h>
! 58: #include <machine/pmap.h>
! 59: #include <machine/pte.h>
! 60: #include <machine/reg.h>
! 61:
! 62: void savectx(struct pcb *);
! 63:
! 64: /*
! 65: * Finish a fork operation, with process p2 nearly set up.
! 66: * Copy and update the kernel stack and pcb, making the child
! 67: * ready to run, and marking it so that it can return differently
! 68: * than the parent. Returns 1 in the child process, 0 in the parent.
! 69: * We currently double-map the user area so that the stack is at the same
! 70: * address in each process; in the future we will probably relocate
! 71: * the frame pointers on the stack after copying.
! 72: */
! 73: void
! 74: cpu_fork(p1, p2, stack, stacksize, func, arg)
! 75: struct proc *p1, *p2;
! 76: void *stack;
! 77: size_t stacksize;
! 78: void (*func)(void *);
! 79: void *arg;
! 80: {
! 81: struct pcb *pcb = &p2->p_addr->u_pcb;
! 82: struct trapframe *tf;
! 83: struct switchframe *sf;
! 84: extern struct pcb *curpcb;
! 85:
! 86: p2->p_md.md_flags = p1->p_md.md_flags;
! 87:
! 88: /* Copy pcb from proc p1 to p2. */
! 89: if (p1 == curproc) {
! 90: /* Sync the PCB before we copy it. */
! 91: savectx(curpcb);
! 92: }
! 93: #ifdef DIAGNOSTIC
! 94: else if (p1 != &proc0)
! 95: panic("cpu_fork: curproc");
! 96: #endif
! 97: *pcb = p1->p_addr->u_pcb;
! 98:
! 99: /*
! 100: * Copy the trap frame.
! 101: */
! 102: tf = (struct trapframe *)((u_int)p2->p_addr + USPACE) -1;
! 103: p2->p_md.md_regs = (int *)tf;
! 104: *tf = *(struct trapframe *)p1->p_md.md_regs;
! 105:
! 106: /*
! 107: * If specified, give the child a different stack.
! 108: */
! 109: if (stack != NULL)
! 110: tf->tf_regs[15] = (u_int)stack + stacksize;
! 111:
! 112: sf = (struct switchframe *)tf - 1;
! 113: sf->sf_pc = (u_int)proc_trampoline;
! 114: pcb->pcb_regs[6] = (int)func; /* A2 */
! 115: pcb->pcb_regs[7] = (int)arg; /* A3 */
! 116: pcb->pcb_regs[11] = (int)sf; /* SSP */
! 117: pcb->pcb_ps = PSL_LOWIPL; /* start kthreads at IPL 0 */
! 118: }
! 119:
! 120: /*
! 121: * cpu_exit is called as the last action during exit.
! 122: * We release the address space and machine-dependent resources,
! 123: * block context switches and then call switch_exit() which will
! 124: * free our stack and user area and switch to another process.
! 125: * Thus, we never return.
! 126: */
! 127: void
! 128: cpu_exit(p)
! 129: struct proc *p;
! 130: {
! 131:
! 132: (void)splhigh();
! 133: switch_exit(p);
! 134: /* NOTREACHED */
! 135: }
! 136:
! 137: /*
! 138: * Dump the machine specific segment at the start of a core dump.
! 139: * This means the CPU and FPU registers. The format used here is
! 140: * the same one ptrace uses, so gdb can be machine independent.
! 141: *
! 142: * XXX - Generate Sun format core dumps for Sun executables?
! 143: */
! 144: struct md_core {
! 145: struct reg intreg;
! 146: struct fpreg freg;
! 147: };
! 148: int
! 149: cpu_coredump(p, vp, cred, chdr)
! 150: struct proc *p;
! 151: struct vnode *vp;
! 152: struct ucred *cred;
! 153: struct core *chdr;
! 154: {
! 155: struct md_core md_core;
! 156: struct coreseg cseg;
! 157: int error;
! 158:
! 159: CORE_SETMAGIC(*chdr, COREMAGIC, MID_MACHINE, 0);
! 160: chdr->c_hdrsize = ALIGN(sizeof(*chdr));
! 161: chdr->c_seghdrsize = ALIGN(sizeof(cseg));
! 162: chdr->c_cpusize = sizeof(md_core);
! 163:
! 164: /* Save integer registers. */
! 165: error = process_read_regs(p, &md_core.intreg);
! 166: if (error)
! 167: return error;
! 168:
! 169: if (fputype) {
! 170: /* Save floating point registers. */
! 171: error = process_read_fpregs(p, &md_core.freg);
! 172: if (error)
! 173: return error;
! 174: } else {
! 175: /* Make sure these are clear. */
! 176: bzero((caddr_t)&md_core.freg, sizeof(md_core.freg));
! 177: }
! 178:
! 179: CORE_SETMAGIC(cseg, CORESEGMAGIC, MID_MACHINE, CORE_CPU);
! 180: cseg.c_addr = 0;
! 181: cseg.c_size = chdr->c_cpusize;
! 182:
! 183: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&cseg, chdr->c_seghdrsize,
! 184: (off_t)chdr->c_hdrsize, UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred,
! 185: NULL, p);
! 186: if (error)
! 187: return error;
! 188:
! 189: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&md_core, sizeof(md_core),
! 190: (off_t)(chdr->c_hdrsize + chdr->c_seghdrsize), UIO_SYSSPACE,
! 191: IO_NODELOCKED|IO_UNIT, cred, NULL, p);
! 192: if (error)
! 193: return error;
! 194:
! 195: chdr->c_nseg++;
! 196: return 0;
! 197: }
! 198:
! 199: /*
! 200: * Map an IO request into kernel virtual address space.
! 201: *
! 202: * XXX we allocate KVA space by using kmem_alloc_wait which we know
! 203: * allocates space without backing physical memory. This implementation
! 204: * is a total crock, the multiple mappings of these physical pages should
! 205: * be reflected in the higher-level VM structures to avoid problems.
! 206: */
! 207: void
! 208: vmapbuf(bp, len)
! 209: struct buf *bp;
! 210: vsize_t len;
! 211: {
! 212: struct pmap *upmap, *kpmap;
! 213: vaddr_t uva; /* User VA (map from) */
! 214: vaddr_t kva; /* Kernel VA (new to) */
! 215: vaddr_t pa; /* physical address */
! 216: vsize_t off;
! 217:
! 218: #ifdef DIAGNOSTIC
! 219: if ((bp->b_flags & B_PHYS) == 0)
! 220: panic("vmapbuf");
! 221: #endif
! 222:
! 223: uva = trunc_page((vaddr_t)(bp->b_saveaddr = bp->b_data));
! 224: off = (vaddr_t)bp->b_data - uva;
! 225: len = round_page(off + len);
! 226: kva = uvm_km_valloc_wait(phys_map, len);
! 227: bp->b_data = (caddr_t)(kva + off);
! 228:
! 229: upmap = vm_map_pmap(&bp->b_proc->p_vmspace->vm_map);
! 230: kpmap = vm_map_pmap(phys_map);
! 231: do {
! 232: if (pmap_extract(upmap, uva, &pa) == FALSE)
! 233: panic("vmapbuf: null page frame");
! 234: pmap_enter(kpmap, kva, pa, VM_PROT_READ | VM_PROT_WRITE,
! 235: VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED);
! 236: uva += PAGE_SIZE;
! 237: kva += PAGE_SIZE;
! 238: len -= PAGE_SIZE;
! 239: } while (len);
! 240: pmap_update(pmap_kernel());
! 241: }
! 242:
! 243: /*
! 244: * Free the io map PTEs associated with this IO operation.
! 245: */
! 246: void
! 247: vunmapbuf(bp, len)
! 248: struct buf *bp;
! 249: vsize_t len;
! 250: {
! 251: vaddr_t kva;
! 252: vsize_t off;
! 253:
! 254: #ifdef DIAGNOSTIC
! 255: if ((bp->b_flags & B_PHYS) == 0)
! 256: panic("vunmapbuf");
! 257: #endif
! 258:
! 259: kva = trunc_page((vaddr_t)bp->b_data);
! 260: off = (vaddr_t)bp->b_data - kva;
! 261: len = round_page(off + len);
! 262:
! 263: pmap_remove(vm_map_pmap(phys_map), kva, kva + len);
! 264: pmap_update(pmap_kernel());
! 265: uvm_km_free_wakeup(phys_map, kva, len);
! 266: bp->b_data = bp->b_saveaddr;
! 267: bp->b_saveaddr = 0;
! 268: }
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