diff options
Diffstat (limited to 'lib/libkvm/kvm_mips.c')
| -rw-r--r-- | lib/libkvm/kvm_mips.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_mips.c b/lib/libkvm/kvm_mips.c new file mode 100644 index 0000000..b0f4cfe --- /dev/null +++ b/lib/libkvm/kvm_mips.c @@ -0,0 +1,207 @@ +/*- + * Copyright (c) 1989, 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software developed by the Computer Systems + * Engineering group at Lawrence Berkeley Laboratory under DARPA contract + * BG 91-66 and contributed to Berkeley. Modified for MIPS by Ralph Campbell. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)kvm_mips.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ +/* + * MIPS machine dependent routines for kvm. Hopefully, the forthcoming + * vm code will one day obsolete this module. + */ + +#include <sys/param.h> +#include <sys/user.h> +#include <sys/proc.h> +#include <sys/stat.h> +#include <unistd.h> +#include <nlist.h> +#include <kvm.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> + +#include <limits.h> +#include <db.h> + +#include "kvm_private.h" + +#include <machine/machConst.h> +#include <machine/pte.h> +#include <machine/pmap.h> + +struct vmstate { + pt_entry_t *Sysmap; + u_int Sysmapsize; +}; + +#define KREAD(kd, addr, p)\ + (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) + +void +_kvm_freevtop(kd) + kvm_t *kd; +{ + if (kd->vmst != 0) + free(kd->vmst); +} + +int +_kvm_initvtop(kd) + kvm_t *kd; +{ + struct vmstate *vm; + struct nlist nlist[3]; + + vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); + if (vm == 0) + return (-1); + kd->vmst = vm; + + nlist[0].n_name = "Sysmap"; + nlist[1].n_name = "Sysmapsize"; + nlist[2].n_name = 0; + + if (kvm_nlist(kd, nlist) != 0) { + _kvm_err(kd, kd->program, "bad namelist"); + return (-1); + } + if (KREAD(kd, (u_long)nlist[0].n_value, &vm->Sysmap)) { + _kvm_err(kd, kd->program, "cannot read Sysmap"); + return (-1); + } + if (KREAD(kd, (u_long)nlist[1].n_value, &vm->Sysmapsize)) { + _kvm_err(kd, kd->program, "cannot read mmutype"); + return (-1); + } + return (0); +} + +/* + * Translate a kernel virtual address to a physical address. + */ +int +_kvm_kvatop(kd, va, pa) + kvm_t *kd; + u_long va; + u_long *pa; +{ + register struct vmstate *vm; + u_long pte, addr, offset; + + if (ISALIVE(kd)) { + _kvm_err(kd, 0, "vatop called in live kernel!"); + return((off_t)0); + } + vm = kd->vmst; + offset = va & PGOFSET; + /* + * If we are initializing (kernel segment table pointer not yet set) + * then return pa == va to avoid infinite recursion. + */ + if (vm->Sysmap == 0) { + *pa = va; + return (NBPG - offset); + } + if (va < KERNBASE || + va >= VM_MIN_KERNEL_ADDRESS + vm->Sysmapsize * NBPG) + goto invalid; + if (va < VM_MIN_KERNEL_ADDRESS) { + *pa = MACH_CACHED_TO_PHYS(va); + return (NBPG - offset); + } + addr = (u_long)(vm->Sysmap + ((va - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT)); + /* + * Can't use KREAD to read kernel segment table entries. + * Fortunately it is 1-to-1 mapped so we don't have to. + */ + if (lseek(kd->pmfd, (off_t)addr, 0) < 0 || + read(kd->pmfd, (char *)&pte, sizeof(pte)) < 0) + goto invalid; + if (!(pte & PG_V)) + goto invalid; + *pa = (pte & PG_FRAME) | offset; + return (NBPG - offset); + +invalid: + _kvm_err(kd, 0, "invalid address (%x)", va); + return (0); +} + +/* + * Translate a user virtual address to a physical address. + */ +int +_kvm_uvatop(kd, p, va, pa) + kvm_t *kd; + const struct proc *p; + u_long va; + u_long *pa; +{ + register struct vmspace *vms = p->p_vmspace; + u_long kva, offset; + + if (va >= KERNBASE) + goto invalid; + + /* read the address of the first level table */ + kva = (u_long)&vms->vm_pmap.pm_segtab; + if (kvm_read(kd, kva, (char *)&kva, sizeof(kva)) != sizeof(kva)) + goto invalid; + if (kva == 0) + goto invalid; + + /* read the address of the second level table */ + kva += (va >> SEGSHIFT) * sizeof(caddr_t); + if (kvm_read(kd, kva, (char *)&kva, sizeof(kva)) != sizeof(kva)) + goto invalid; + if (kva == 0) + goto invalid; + + /* read the pte from the second level table */ + kva += (va >> PGSHIFT) & (NPTEPG - 1); + if (kvm_read(kd, kva, (char *)&kva, sizeof(kva)) != sizeof(kva)) + goto invalid; + if (!(kva & PG_V)) + goto invalid; + offset = va & PGOFSET; + *pa = (kva & PG_FRAME) | offset; + return (NBPG - offset); + +invalid: + _kvm_err(kd, 0, "invalid address (%x)", va); + return (0); +} |
