Annotation of sys/arch/vax/vax/vm_machdep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: vm_machdep.c,v 1.34 2007/06/20 17:29:36 miod Exp $ */
! 2: /* $NetBSD: vm_machdep.c,v 1.67 2000/06/29 07:14:34 mrg Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1994 Ludd, University of Lule}, Sweden.
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed at Ludd, University of Lule}.
! 19: * 4. The name of the author may not be used to endorse or promote products
! 20: * derived from this software without specific prior written permission
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 32: */
! 33:
! 34: #include <sys/types.h>
! 35: #include <sys/param.h>
! 36: #include <sys/systm.h>
! 37: #include <sys/proc.h>
! 38: #include <sys/signalvar.h>
! 39: #include <sys/user.h>
! 40: #include <sys/exec.h>
! 41: #include <sys/vnode.h>
! 42: #include <sys/core.h>
! 43: #include <sys/mount.h>
! 44: #include <sys/device.h>
! 45:
! 46: #include <uvm/uvm_extern.h>
! 47:
! 48: #include <machine/vmparam.h>
! 49: #include <machine/mtpr.h>
! 50: #include <machine/pmap.h>
! 51: #include <machine/pte.h>
! 52: #include <machine/macros.h>
! 53: #include <machine/trap.h>
! 54: #include <machine/pcb.h>
! 55: #include <machine/frame.h>
! 56: #include <machine/cpu.h>
! 57: #include <machine/sid.h>
! 58:
! 59: #include <sys/syscallargs.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;
! 72: *
! 73: * If an alternate user-level stack is requested (with non-zero values
! 74: * in both the stack and stacksize args), set up the user stack pointer
! 75: * accordingly.
! 76: *
! 77: * cpu_fork() copies parent process trapframe directly into child PCB
! 78: * so that when we swtch() to the child process it will go directly
! 79: * back to user mode without any need to jump back through kernel.
! 80: * We also take away mapping for the second page after pcb, so that
! 81: * we get something like a "red zone".
! 82: * No need for either double-map kernel stack or relocate it when
! 83: * forking.
! 84: */
! 85: void
! 86: cpu_fork(p1, p2, stack, stacksize, func, arg)
! 87: struct proc *p1, *p2;
! 88: void *stack;
! 89: size_t stacksize;
! 90: void (*func)(void *);
! 91: void *arg;
! 92: {
! 93: struct pcb *pcb;
! 94: struct trapframe *tf;
! 95: struct callsframe *cf;
! 96: extern int sret; /* Return address in trap routine */
! 97:
! 98: #ifdef DIAGNOSTIC
! 99: /*
! 100: * if p1 != curproc && p1 == &proc0, we're creating a kernel thread.
! 101: */
! 102: if (p1 != curproc && p1 != &proc0)
! 103: panic("cpu_fork: curproc");
! 104: #endif
! 105:
! 106: /*
! 107: * Copy the trap frame.
! 108: */
! 109: tf = (struct trapframe *)((u_int)p2->p_addr + USPACE) - 1;
! 110: p2->p_addr->u_pcb.framep = tf;
! 111: bcopy(p1->p_addr->u_pcb.framep, tf, sizeof(*tf));
! 112:
! 113: /*
! 114: * Activate address space for the new process. The PTEs have
! 115: * already been allocated by way of pmap_create().
! 116: * This writes the page table registers to the PCB.
! 117: */
! 118: pmap_activate(p2);
! 119:
! 120: /* Mark guard page invalid in kernel stack */
! 121: *kvtopte((u_int)p2->p_addr + REDZONEADDR) &= ~PG_V;
! 122:
! 123: /*
! 124: * Set up the calls frame above (below) the trapframe
! 125: * and populate it with something good.
! 126: * This is so that we can simulate that we were called by a
! 127: * CALLS insn in the function given as argument.
! 128: */
! 129: cf = (struct callsframe *)tf - 1;
! 130: cf->ca_cond = 0;
! 131: cf->ca_maskpsw = 0x20000000; /* CALLS stack frame, no registers */
! 132: cf->ca_pc = (unsigned)&sret; /* return PC; userspace trampoline */
! 133: cf->ca_argno = 1;
! 134: cf->ca_arg1 = (int)arg;
! 135:
! 136: /*
! 137: * Set up internal defs in PCB. This matches the "fake" CALLS frame
! 138: * that we constructed earlier.
! 139: */
! 140: pcb = &p2->p_addr->u_pcb;
! 141: pcb->iftrap = NULL;
! 142: pcb->KSP = (long)cf;
! 143: pcb->FP = (long)cf;
! 144: pcb->AP = (long)&cf->ca_argno;
! 145: pcb->PC = (int)func + 2; /* Skip save mask */
! 146:
! 147: /*
! 148: * If specified, give the child a different stack.
! 149: */
! 150: if (stack != NULL)
! 151: tf->sp = (u_long)stack + stacksize;
! 152:
! 153: tf->r0 = p1->p_pid; /* parent pid. (shouldn't be needed) */
! 154: tf->r1 = 1;
! 155: tf->psl = PSL_U|PSL_PREVU;
! 156: }
! 157:
! 158: int
! 159: cpu_exec_aout_makecmds(p, epp)
! 160: struct proc *p;
! 161: struct exec_package *epp;
! 162: {
! 163: return ENOEXEC;
! 164: }
! 165:
! 166: int
! 167: sys_sysarch(p, v, retval)
! 168: struct proc *p;
! 169: void *v;
! 170: register_t *retval;
! 171: {
! 172:
! 173: return (ENOSYS);
! 174: };
! 175:
! 176: /*
! 177: * Dump the machine specific header information at the start of a core dump.
! 178: * First put all regs in PCB for debugging purposes. This is not an good
! 179: * way to do this, but good for my purposes so far.
! 180: */
! 181: int
! 182: cpu_coredump(p, vp, cred, chdr)
! 183: struct proc *p;
! 184: struct vnode *vp;
! 185: struct ucred *cred;
! 186: struct core *chdr;
! 187: {
! 188: struct trapframe *tf;
! 189: struct md_coredump state;
! 190: struct reg *regs = &state.md_reg;
! 191: struct coreseg cseg;
! 192: int error;
! 193:
! 194: tf = p->p_addr->u_pcb.framep;
! 195: CORE_SETMAGIC(*chdr, COREMAGIC, MID_MACHINE, 0);
! 196: chdr->c_hdrsize = sizeof(struct core);
! 197: chdr->c_seghdrsize = sizeof(struct coreseg);
! 198: chdr->c_cpusize = sizeof(struct md_coredump);
! 199:
! 200: bcopy(&tf->r0, ®s->r0, 12 * sizeof(int));
! 201: regs->ap = tf->ap;
! 202: regs->fp = tf->fp;
! 203: regs->sp = tf->sp;
! 204: regs->pc = tf->pc;
! 205: regs->psl = tf->psl;
! 206:
! 207: CORE_SETMAGIC(cseg, CORESEGMAGIC, MID_MACHINE, CORE_CPU);
! 208: cseg.c_addr = 0;
! 209: cseg.c_size = chdr->c_cpusize;
! 210:
! 211: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&cseg, chdr->c_seghdrsize,
! 212: (off_t)chdr->c_hdrsize, UIO_SYSSPACE,
! 213: IO_NODELOCKED|IO_UNIT, cred, NULL, p);
! 214: if (error)
! 215: return error;
! 216:
! 217: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&state, sizeof(state),
! 218: (off_t)(chdr->c_hdrsize + chdr->c_seghdrsize), UIO_SYSSPACE,
! 219: IO_NODELOCKED|IO_UNIT, cred, NULL, p);
! 220:
! 221: if (!error)
! 222: chdr->c_nseg++;
! 223:
! 224: return error;
! 225: }
! 226:
! 227: /*
! 228: * Map in a bunch of pages read/writeable for the kernel.
! 229: */
! 230: void
! 231: ioaccess(vaddr, paddr, npgs)
! 232: vaddr_t vaddr;
! 233: paddr_t paddr;
! 234: int npgs;
! 235: {
! 236: u_int *pte = (u_int *)kvtopte(vaddr), template;
! 237:
! 238: template = PG_V | PG_KW | PG_PFNUM(paddr);
! 239: while (npgs-- != 0)
! 240: *pte++ = template++;
! 241: mtpr(0, PR_TBIA);
! 242: }
! 243:
! 244: /*
! 245: * Opposite to the above: just forget their mapping.
! 246: */
! 247: void
! 248: iounaccess(vaddr, npgs)
! 249: vaddr_t vaddr;
! 250: int npgs;
! 251: {
! 252: u_int *pte = (u_int *)kvtopte(vaddr);
! 253:
! 254: while (npgs-- != 0)
! 255: *pte++ = PG_NV;
! 256: mtpr(0, PR_TBIA);
! 257: }
! 258:
! 259: /*
! 260: * Map a user I/O request into kernel virtual address space.
! 261: * Note: the pages are already locked by uvm_vslock(), so we
! 262: * do not need to pass an access_type to pmap_enter().
! 263: */
! 264: void
! 265: vmapbuf(bp, len)
! 266: struct buf *bp;
! 267: vsize_t len;
! 268: {
! 269: #if VAX46 || VAX48 || VAX49 || VAX53
! 270: vaddr_t faddr, taddr, off;
! 271: paddr_t pa;
! 272: struct proc *p;
! 273:
! 274: if (vax_boardtype != VAX_BTYP_46
! 275: && vax_boardtype != VAX_BTYP_48
! 276: && vax_boardtype != VAX_BTYP_49
! 277: && vax_boardtype != VAX_BTYP_1303)
! 278: return;
! 279: if ((bp->b_flags & B_PHYS) == 0)
! 280: panic("vmapbuf");
! 281: p = bp->b_proc;
! 282: faddr = trunc_page((vaddr_t)(bp->b_saveaddr = bp->b_data));
! 283: off = (vaddr_t)bp->b_data - faddr;
! 284: len = round_page(off + len);
! 285: taddr = uvm_km_valloc_wait(phys_map, len);
! 286: bp->b_data = (caddr_t)(taddr + off);
! 287: len = atop(len);
! 288: while (len--) {
! 289: if (pmap_extract(vm_map_pmap(&p->p_vmspace->vm_map), faddr,
! 290: &pa) == FALSE)
! 291: panic("vmapbuf: null page frame");
! 292: pmap_enter(vm_map_pmap(phys_map), taddr, trunc_page(pa),
! 293: VM_PROT_READ|VM_PROT_WRITE, VM_PROT_READ|VM_PROT_WRITE|PMAP_WIRED);
! 294: faddr += PAGE_SIZE;
! 295: taddr += PAGE_SIZE;
! 296: }
! 297: pmap_update(vm_map_pmap(phys_map));
! 298: #endif
! 299: }
! 300:
! 301: /*
! 302: * Unmap a previously-mapped user I/O request.
! 303: */
! 304: void
! 305: vunmapbuf(bp, len)
! 306: struct buf *bp;
! 307: vsize_t len;
! 308: {
! 309: #if VAX46 || VAX48 || VAX49 || VAX53
! 310: vaddr_t addr, off;
! 311:
! 312: if (vax_boardtype != VAX_BTYP_46
! 313: && vax_boardtype != VAX_BTYP_48
! 314: && vax_boardtype != VAX_BTYP_49
! 315: && vax_boardtype != VAX_BTYP_1303)
! 316: return;
! 317: if ((bp->b_flags & B_PHYS) == 0)
! 318: panic("vunmapbuf");
! 319: addr = trunc_page((vaddr_t)bp->b_data);
! 320: off = (vaddr_t)bp->b_data - addr;
! 321: len = round_page(off + len);
! 322: pmap_remove(vm_map_pmap(phys_map), addr, addr + len);
! 323: pmap_update(vm_map_pmap(phys_map));
! 324: uvm_km_free_wakeup(phys_map, addr, len);
! 325: bp->b_data = bp->b_saveaddr;
! 326: bp->b_saveaddr = NULL;
! 327: #endif
! 328: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to vm_machdep.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / arch / vax / vax