Annotation of sys/arch/amd64/amd64/vm_machdep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: vm_machdep.c,v 1.10 2007/05/27 20:59:25 miod Exp $ */
! 2: /* $NetBSD: vm_machdep.c,v 1.1 2003/04/26 18:39:33 fvdl Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1995 Charles M. Hannum. All rights reserved.
! 6: * Copyright (c) 1982, 1986 The Regents of the University of California.
! 7: * Copyright (c) 1989, 1990 William Jolitz
! 8: * All rights reserved.
! 9: *
! 10: * This code is derived from software contributed to Berkeley by
! 11: * the Systems Programming Group of the University of Utah Computer
! 12: * Science Department, and William Jolitz.
! 13: *
! 14: * Redistribution and use in source and binary forms, with or without
! 15: * modification, are permitted provided that the following conditions
! 16: * are met:
! 17: * 1. Redistributions of source code must retain the above copyright
! 18: * notice, this list of conditions and the following disclaimer.
! 19: * 2. Redistributions in binary form must reproduce the above copyright
! 20: * notice, this list of conditions and the following disclaimer in the
! 21: * documentation and/or other materials provided with the distribution.
! 22: * 3. Neither the name of the University nor the names of its contributors
! 23: * may be used to endorse or promote products derived from this software
! 24: * without specific prior written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 36: * SUCH DAMAGE.
! 37: *
! 38: * @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
! 39: */
! 40:
! 41: /*
! 42: * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
! 43: */
! 44:
! 45: #include <sys/param.h>
! 46: #include <sys/systm.h>
! 47: #include <sys/proc.h>
! 48: #include <sys/malloc.h>
! 49: #include <sys/vnode.h>
! 50: #include <sys/buf.h>
! 51: #include <sys/user.h>
! 52: #include <sys/core.h>
! 53: #include <sys/exec.h>
! 54: #include <sys/ptrace.h>
! 55: #include <sys/signalvar.h>
! 56:
! 57: #include <uvm/uvm_extern.h>
! 58:
! 59: #include <machine/cpu.h>
! 60: #include <machine/gdt.h>
! 61: #include <machine/reg.h>
! 62: #include <machine/specialreg.h>
! 63: #include <machine/fpu.h>
! 64: #include <machine/mtrr.h>
! 65:
! 66: void setredzone(struct proc *);
! 67:
! 68: /*
! 69: * Finish a fork operation, with process p2 nearly set up.
! 70: * Copy and update the kernel stack and pcb, making the child
! 71: * ready to run, and marking it so that it can return differently
! 72: * than the parent. Returns 1 in the child process, 0 in the parent.
! 73: * We currently double-map the user area so that the stack is at the same
! 74: * address in each process; in the future we will probably relocate
! 75: * the frame pointers on the stack after copying.
! 76: */
! 77: void
! 78: cpu_fork(struct proc *p1, struct proc *p2, void *stack, size_t stacksize,
! 79: void (*func)(void *), void *arg)
! 80: {
! 81: struct pcb *pcb = &p2->p_addr->u_pcb;
! 82: struct trapframe *tf;
! 83: struct switchframe *sf;
! 84:
! 85: /*
! 86: * If fpuproc != p1, then the fpu h/w state is irrelevant and the
! 87: * state had better already be in the pcb. This is true for forks
! 88: * but not for dumps.
! 89: *
! 90: * If fpuproc == p1, then we have to save the fpu h/w state to
! 91: * p1's pcb so that we can copy it.
! 92: */
! 93: if (p1->p_addr->u_pcb.pcb_fpcpu != NULL)
! 94: fpusave_proc(p1, 1);
! 95:
! 96: p2->p_md.md_flags = p1->p_md.md_flags;
! 97:
! 98: /* Copy pcb from proc p1 to p2. */
! 99: if (p1 == curproc) {
! 100: /* Sync the PCB before we copy it. */
! 101: savectx(curpcb);
! 102: }
! 103: #ifdef DIAGNOSTIC
! 104: else if (p1 != &proc0)
! 105: panic("cpu_fork: curproc");
! 106: #endif
! 107: *pcb = p1->p_addr->u_pcb;
! 108:
! 109: /*
! 110: * Preset these so that gdt_compact() doesn't get confused if called
! 111: * during the allocations below.
! 112: *
! 113: * Note: pcb_ldt_sel is handled in the pmap_activate() call when
! 114: * we run the new process.
! 115: */
! 116: p2->p_md.md_tss_sel = GSEL(GNULL_SEL, SEL_KPL);
! 117:
! 118: /*
! 119: * Activate the address space. Note this will refresh pcb_ldt_sel.
! 120: */
! 121: pmap_activate(p2);
! 122:
! 123: /* Fix up the TSS. */
! 124: pcb->pcb_tss.tss_rsp0 = (u_int64_t)p2->p_addr + USPACE - 16;
! 125: pcb->pcb_tss.tss_ist[0] = (u_int64_t)p2->p_addr + PAGE_SIZE - 16;
! 126: p2->p_md.md_tss_sel = tss_alloc(pcb);
! 127:
! 128: /*
! 129: * Copy the trapframe.
! 130: */
! 131: p2->p_md.md_regs = tf = (struct trapframe *)pcb->pcb_tss.tss_rsp0 - 1;
! 132: *tf = *p1->p_md.md_regs;
! 133:
! 134: setredzone(p2);
! 135:
! 136: /*
! 137: * If specified, give the child a different stack.
! 138: */
! 139: if (stack != NULL)
! 140: tf->tf_rsp = (u_int64_t)stack + stacksize;
! 141:
! 142: sf = (struct switchframe *)tf - 1;
! 143: sf->sf_r12 = (u_int64_t)func;
! 144: sf->sf_r13 = (u_int64_t)arg;
! 145: /* XXX fork of init(8) returns via proc_trampoline() */
! 146: if (p2->p_pid == 1)
! 147: sf->sf_rip = (u_int64_t)proc_trampoline;
! 148: else
! 149: sf->sf_rip = (u_int64_t)child_trampoline;
! 150: pcb->pcb_rsp = (u_int64_t)sf;
! 151: pcb->pcb_rbp = 0;
! 152: }
! 153:
! 154: /*
! 155: * cpu_exit is called as the last action during exit.
! 156: *
! 157: * We clean up a little and then call switch_exit() with the old proc as an
! 158: * argument. switch_exit() first switches to proc0's context, and finally
! 159: * jumps into switch() to wait for another process to wake up.
! 160: */
! 161: void
! 162: cpu_exit(struct proc *p)
! 163: {
! 164:
! 165: /* If we were using the FPU, forget about it. */
! 166: if (p->p_addr->u_pcb.pcb_fpcpu != NULL)
! 167: fpusave_proc(p, 0);
! 168:
! 169: if (p->p_md.md_flags & MDP_USEDMTRR)
! 170: mtrr_clean(p);
! 171:
! 172: /*
! 173: * No need to do user LDT cleanup here; it's handled in
! 174: * pmap_destroy().
! 175: */
! 176:
! 177: switch_exit(p, exit2);
! 178: }
! 179:
! 180: /*
! 181: * cpu_wait is called from reaper() to let machine-dependent
! 182: * code free machine-dependent resources that couldn't be freed
! 183: * in cpu_exit().
! 184: */
! 185: void
! 186: cpu_wait(struct proc *p)
! 187: {
! 188: /* Nuke the TSS. */
! 189: tss_free(p->p_md.md_tss_sel);
! 190: }
! 191:
! 192: /*
! 193: * Dump the machine specific segment at the start of a core dump.
! 194: */
! 195: struct md_core {
! 196: struct reg intreg;
! 197: struct fpreg freg;
! 198: };
! 199:
! 200: int
! 201: cpu_coredump(struct proc *p, struct vnode *vp, struct ucred *cred,
! 202: struct core *chdr)
! 203: {
! 204: struct md_core md_core;
! 205: struct coreseg cseg;
! 206: int error;
! 207:
! 208: CORE_SETMAGIC(*chdr, COREMAGIC, MID_MACHINE, 0);
! 209: chdr->c_hdrsize = ALIGN(sizeof(*chdr));
! 210: chdr->c_seghdrsize = ALIGN(sizeof(cseg));
! 211: chdr->c_cpusize = sizeof(md_core);
! 212:
! 213: /* Save integer registers. */
! 214: error = process_read_regs(p, &md_core.intreg);
! 215: if (error)
! 216: return error;
! 217:
! 218: /* Save floating point registers. */
! 219: error = process_read_fpregs(p, &md_core.freg);
! 220: if (error)
! 221: return error;
! 222:
! 223: CORE_SETMAGIC(cseg, CORESEGMAGIC, MID_MACHINE, CORE_CPU);
! 224: cseg.c_addr = 0;
! 225: cseg.c_size = chdr->c_cpusize;
! 226:
! 227: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&cseg, chdr->c_seghdrsize,
! 228: (off_t)chdr->c_hdrsize, UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred,
! 229: NULL, p);
! 230: if (error)
! 231: return error;
! 232:
! 233: error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&md_core, sizeof(md_core),
! 234: (off_t)(chdr->c_hdrsize + chdr->c_seghdrsize), UIO_SYSSPACE,
! 235: IO_NODELOCKED|IO_UNIT, cred, NULL, p);
! 236: if (error)
! 237: return error;
! 238:
! 239: chdr->c_nseg++;
! 240: return 0;
! 241: }
! 242:
! 243: /*
! 244: * Set a red zone in the kernel stack after the u. area.
! 245: */
! 246: void
! 247: setredzone(struct proc *p)
! 248: {
! 249: #if 0
! 250: pmap_remove(pmap_kernel(), (vaddr_t)p->p_addr + PAGE_SIZE,
! 251: (vaddr_t)p->p_addr + 2 * PAGE_SIZE);
! 252: pmap_update(pmap_kernel());
! 253: #endif
! 254: }
! 255:
! 256: /*
! 257: * Map a user I/O request into kernel virtual address space.
! 258: * Note: the pages are already locked by uvm_vslock(), so we
! 259: * do not need to pass an access_type to pmap_enter().
! 260: */
! 261: void
! 262: vmapbuf(struct buf *bp, vsize_t len)
! 263: {
! 264: vaddr_t faddr, taddr, off;
! 265: paddr_t fpa;
! 266:
! 267: if ((bp->b_flags & B_PHYS) == 0)
! 268: panic("vmapbuf");
! 269: faddr = trunc_page((vaddr_t)bp->b_saveaddr = bp->b_data);
! 270: off = (vaddr_t)bp->b_data - faddr;
! 271: len = round_page(off + len);
! 272: taddr= uvm_km_valloc_wait(phys_map, len);
! 273: bp->b_data = (caddr_t)(taddr + off);
! 274: /*
! 275: * The region is locked, so we expect that pmap_pte() will return
! 276: * non-NULL.
! 277: * XXX: unwise to expect this in a multithreaded environment.
! 278: * anything can happen to a pmap between the time we lock a
! 279: * region, release the pmap lock, and then relock it for
! 280: * the pmap_extract().
! 281: *
! 282: * no need to flush TLB since we expect nothing to be mapped
! 283: * where we we just allocated (TLB will be flushed when our
! 284: * mapping is removed).
! 285: */
! 286: while (len) {
! 287: (void) pmap_extract(vm_map_pmap(&bp->b_proc->p_vmspace->vm_map),
! 288: faddr, &fpa);
! 289: pmap_kenter_pa(taddr, fpa, VM_PROT_READ|VM_PROT_WRITE);
! 290: faddr += PAGE_SIZE;
! 291: taddr += PAGE_SIZE;
! 292: len -= PAGE_SIZE;
! 293: }
! 294: }
! 295:
! 296: /*
! 297: * Unmap a previously-mapped user I/O request.
! 298: */
! 299: void
! 300: vunmapbuf(struct buf *bp, vsize_t len)
! 301: {
! 302: vaddr_t addr, off;
! 303:
! 304: if ((bp->b_flags & B_PHYS) == 0)
! 305: panic("vunmapbuf");
! 306: addr = trunc_page((vaddr_t)bp->b_data);
! 307: off = (vaddr_t)bp->b_data - addr;
! 308: len = round_page(off + len);
! 309: pmap_kremove(addr, len);
! 310: pmap_update(pmap_kernel());
! 311: uvm_km_free_wakeup(phys_map, addr, len);
! 312: bp->b_data = bp->b_saveaddr;
! 313: bp->b_saveaddr = 0;
! 314: }
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