Annotation of sys/arch/hp300/hp300/vm_machdep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: vm_machdep.c,v 1.43 2007/05/27 20:59:25 miod Exp $ */
! 2: /* $NetBSD: vm_machdep.c,v 1.60 2001/07/06 05:53:35 chs 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: * from: Utah $Hdr: vm_machdep.c 1.21 91/04/06$
! 38: *
! 39: * @(#)vm_machdep.c 8.6 (Berkeley) 1/12/94
! 40: */
! 41:
! 42: #include <sys/param.h>
! 43: #include <sys/systm.h>
! 44: #include <sys/proc.h>
! 45: #include <sys/signalvar.h>
! 46: #include <sys/malloc.h>
! 47: #include <sys/buf.h>
! 48: #include <sys/vnode.h>
! 49: #include <sys/user.h>
! 50: #include <sys/core.h>
! 51: #include <sys/exec.h>
! 52: #include <sys/ptrace.h>
! 53:
! 54: #include <machine/frame.h>
! 55: #include <machine/cpu.h>
! 56: #include <machine/pte.h>
! 57: #include <machine/reg.h>
! 58:
! 59: #include <uvm/uvm_extern.h>
! 60:
! 61: /*
! 62: * Finish a fork operation, with process p2 nearly set up.
! 63: * Copy and update the pcb and trap frame, making the child ready to run.
! 64: *
! 65: * Rig the child's kernel stack so that it will start out in
! 66: * proc_trampoline() and call child_return() with p2 as an
! 67: * argument. This causes the newly-created child process to go
! 68: * directly to user level with an apparent return value of 0 from
! 69: * fork(), while the parent process returns normally.
! 70: *
! 71: * p1 is the process being forked; if p1 == &proc0, we are creating
! 72: * a kernel thread, and the return path and argument are specified with
! 73: * `func' and `arg'.
! 74: *
! 75: * If an alternate user-level stack is requested (with non-zero values
! 76: * in both the stack and stacksize args), set up the user stack pointer
! 77: * accordingly.
! 78: */
! 79: void
! 80: cpu_fork(p1, p2, stack, stacksize, func, arg)
! 81: struct proc *p1, *p2;
! 82: void *stack;
! 83: size_t stacksize;
! 84: void (*func)(void *);
! 85: void *arg;
! 86: {
! 87: struct pcb *pcb = &p2->p_addr->u_pcb;
! 88: struct trapframe *tf;
! 89: struct switchframe *sf;
! 90: extern struct pcb *curpcb;
! 91:
! 92: p2->p_md.md_flags = p1->p_md.md_flags;
! 93:
! 94: /* Copy pcb from proc p1 to p2. */
! 95: if (p1 == curproc) {
! 96: /* Sync the PCB before we copy it. */
! 97: savectx(curpcb);
! 98: }
! 99: #ifdef DIAGNOSTIC
! 100: else if (p1 != &proc0)
! 101: panic("cpu_fork: curproc");
! 102: #endif
! 103: *pcb = p1->p_addr->u_pcb;
! 104:
! 105: /*
! 106: * Copy the trap frame.
! 107: */
! 108: tf = (struct trapframe *)((u_int)p2->p_addr + USPACE) - 1;
! 109: p2->p_md.md_regs = (int *)tf;
! 110: *tf = *(struct trapframe *)p1->p_md.md_regs;
! 111:
! 112: /*
! 113: * If specified, give the child a different stack.
! 114: */
! 115: if (stack != NULL)
! 116: tf->tf_regs[15] = (u_int)stack + stacksize;
! 117:
! 118: sf = (struct switchframe *)tf - 1;
! 119: sf->sf_pc = (u_int)proc_trampoline;
! 120: pcb->pcb_regs[6] = (int)func; /* A2 */
! 121: pcb->pcb_regs[7] = (int)arg; /* A3 */
! 122: pcb->pcb_regs[11] = (int)sf; /* SSP */
! 123: pcb->pcb_ps = PSL_LOWIPL; /* start kthreads at IPL 0 */
! 124: }
! 125:
! 126: /*
! 127: * cpu_exit is called as the last action during exit.
! 128: *
! 129: * Block context switches and then call switch_exit() which will
! 130: * switch to another process thus we never return.
! 131: */
! 132: void
! 133: cpu_exit(p)
! 134: struct proc *p;
! 135: {
! 136:
! 137: (void) splhigh();
! 138: switch_exit(p);
! 139: /* NOTREACHED */
! 140: }
! 141:
! 142: /*
! 143: * Dump the machine specific header information at the start of a core dump.
! 144: */
! 145: struct md_core {
! 146: struct reg intreg;
! 147: struct fpreg freg;
! 148: };
! 149: int
! 150: cpu_coredump(p, vp, cred, chdr)
! 151: struct proc *p;
! 152: struct vnode *vp;
! 153: struct ucred *cred;
! 154: struct core *chdr;
! 155: {
! 156: struct md_core md_core;
! 157: struct coreseg cseg;
! 158: int error;
! 159:
! 160: CORE_SETMAGIC(*chdr, COREMAGIC, MID_MACHINE, 0);
! 161: chdr->c_hdrsize = ALIGN(sizeof(*chdr));
! 162: chdr->c_seghdrsize = ALIGN(sizeof(cseg));
! 163: chdr->c_cpusize = sizeof(md_core);
! 164:
! 165: /* Save integer registers. */
! 166: error = process_read_regs(p, &md_core.intreg);
! 167: if (error)
! 168: return error;
! 169:
! 170: if (fputype) {
! 171: /* Save floating point registers. */
! 172: error = process_read_fpregs(p, &md_core.freg);
! 173: if (error)
! 174: return error;
! 175: } else {
! 176: /* Make sure these are clear. */
! 177: bzero((caddr_t)&md_core.freg, sizeof(md_core.freg));
! 178: }
! 179:
! 180: CORE_SETMAGIC(cseg, CORESEGMAGIC, MID_MACHINE, CORE_CPU);
! 181: cseg.c_addr = 0;
! 182: cseg.c_size = chdr->c_cpusize;
! 183:
! 184: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&cseg, chdr->c_seghdrsize,
! 185: (off_t)chdr->c_hdrsize, UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred,
! 186: NULL, p);
! 187: if (error)
! 188: return error;
! 189:
! 190: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&md_core, sizeof(md_core),
! 191: (off_t)(chdr->c_hdrsize + chdr->c_seghdrsize), UIO_SYSSPACE,
! 192: IO_NODELOCKED|IO_UNIT, cred, NULL, p);
! 193: if (error)
! 194: return error;
! 195:
! 196: chdr->c_nseg++;
! 197: return 0;
! 198: }
! 199:
! 200: /*
! 201: * Map a user I/O request into kernel virtual address space.
! 202: * Note: the pages are already locked by uvm_vslock(), so we
! 203: * do not need to pass an access_type to pmap_enter().
! 204: */
! 205: void
! 206: vmapbuf(bp, len)
! 207: struct buf *bp;
! 208: vsize_t len;
! 209: {
! 210: struct pmap *upmap, *kpmap;
! 211: vaddr_t uva; /* User VA (map from) */
! 212: vaddr_t kva; /* Kernel VA (new to) */
! 213: paddr_t pa; /* physical address */
! 214: vsize_t off;
! 215:
! 216: if ((bp->b_flags & B_PHYS) == 0)
! 217: panic("vmapbuf");
! 218:
! 219: uva = trunc_page((vaddr_t)(bp->b_saveaddr = bp->b_data));
! 220: off = (vaddr_t)bp->b_data - uva;
! 221: len = round_page(off + len);
! 222: kva = uvm_km_valloc_wait(phys_map, len);
! 223: bp->b_data = (caddr_t)(kva + off);
! 224:
! 225: upmap = vm_map_pmap(&bp->b_proc->p_vmspace->vm_map);
! 226: kpmap = vm_map_pmap(phys_map);
! 227: do {
! 228: if (pmap_extract(upmap, uva, &pa) == FALSE)
! 229: panic("vmapbuf: null page frame");
! 230: pmap_enter(kpmap, kva, pa, VM_PROT_READ|VM_PROT_WRITE,
! 231: VM_PROT_READ|VM_PROT_WRITE|PMAP_WIRED);
! 232: uva += PAGE_SIZE;
! 233: kva += PAGE_SIZE;
! 234: len -= PAGE_SIZE;
! 235: } while (len);
! 236: pmap_update(pmap_kernel());
! 237: }
! 238:
! 239: /*
! 240: * Unmap a previously-mapped user I/O request.
! 241: */
! 242: void
! 243: vunmapbuf(bp, len)
! 244: struct buf *bp;
! 245: vsize_t len;
! 246: {
! 247: vaddr_t kva;
! 248: vsize_t off;
! 249:
! 250: if ((bp->b_flags & B_PHYS) == 0)
! 251: panic("vunmapbuf");
! 252:
! 253: kva = trunc_page((vaddr_t)(bp->b_data));
! 254: off = (vaddr_t)bp->b_data - kva;
! 255: len = round_page(off + len);
! 256:
! 257: pmap_remove(vm_map_pmap(phys_map), kva, kva + len);
! 258: pmap_update(pmap_kernel());
! 259: uvm_km_free_wakeup(phys_map, kva, len);
! 260: bp->b_data = bp->b_saveaddr;
! 261: bp->b_saveaddr = 0;
! 262: }
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