/* $NetBSD: kvm_mips.c,v 1.23 2022/01/10 19:51:30 christos Exp $ */

/*
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
*  Software Distribution Coordinator  or  [email protected]
*  School of Computer Science
*  Carnegie Mellon University
*  Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/

/*
* Modified for NetBSD/mips by Jason R. Thorpe, Numerical Aerospace
* Simulation Facility, NASA Ames Research Center.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: kvm_mips.c,v 1.23 2022/01/10 19:51:30 christos Exp $");
#endif /* LIBC_SCCS and not lint */

/*
* MIPS machine dependent routines for kvm.
*/

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/kcore.h>
#include <sys/types.h>

#include <machine/kcore.h>

#include <stdlib.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>

#include <uvm/uvm_extern.h>

#include <limits.h>
#include <db.h>

#include "kvm_private.h"

#include <mips/cpuregs.h>
#include <mips/vmparam.h>

void
_kvm_freevtop(kvm_t *kd)
{

       /* Not actually used for anything right now, but safe. */
       if (kd->vmst != 0)
               free(kd->vmst);
}

int
_kvm_initvtop(kvm_t *kd)
{

       return (0);
}

/*
* Translate a kernel virtual address to a physical address.
*/
int
_kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
{
       cpu_kcore_hdr_t *cpu_kh;
       int page_off;
       u_int pte;
       paddr_t pte_pa;

       if (ISALIVE(kd)) {
               _kvm_err(kd, 0, "vatop called in live kernel!");
               return((off_t)0);
       }

       cpu_kh = kd->cpu_data;
       page_off = va & PGOFSET;

#ifdef _LP64
       if (MIPS_XKPHYS_P(va)) {
               /*
                * Direct-mapped cached address: just convert it.
                */
               *pa = MIPS_XKPHYS_TO_PHYS(va);
               return (NBPG - page_off);
       }

       if (va < MIPS_XKPHYS_START) {
               /*
                * XUSEG (user virtual address space) - invalid.
                */
               _kvm_err(kd, 0, "invalid kernel virtual address");
               goto lose;
       }
#else
       if (va < MIPS_KSEG0_START) {
               /*
                * KUSEG (user virtual address space) - invalid.
                */
               _kvm_err(kd, 0, "invalid kernel virtual address");
               goto lose;
       }
#endif

       if (MIPS_KSEG0_P(va)) {
               /*
                * Direct-mapped cached address: just convert it.
                */
               *pa = MIPS_KSEG0_TO_PHYS(va);
               return (NBPG - page_off);
       }

       if (MIPS_KSEG1_P(va)) {
               /*
                * Direct-mapped uncached address: just convert it.
                */
               *pa = MIPS_KSEG1_TO_PHYS(va);
               return (NBPG - page_off);
       }

#ifdef _LP64
       if (va >= MIPS_KSEG2_START) {
               /*
                * KUSEG (user virtual address space) - invalid.
                */
               _kvm_err(kd, 0, "invalid kernel virtual address");
               goto lose;
       }
#endif

       /*
        * We now know that we're a KSEG2 (kernel virtually mapped)
        * address.  Translate the address using the pmap's kernel
        * page table.
        */

       /*
        * Step 1: Make sure the kernel page table has a translation
        * for the address.
        */
#ifdef _LP64
       if (va >= (MIPS_XKSEG_START + (cpu_kh->sysmapsize * NBPG))) {
               _kvm_err(kd, 0, "invalid XKSEG address");
               goto lose;
       }
#else
       if (va >= (MIPS_KSEG2_START + (cpu_kh->sysmapsize * NBPG))) {
               _kvm_err(kd, 0, "invalid KSEG2 address");
               goto lose;
       }
#endif

       /*
        * Step 2: Locate and read the PTE.
        */
       pte_pa = cpu_kh->sysmappa +
           (((va - MIPS_KSEG2_START) >> PGSHIFT) * sizeof(u_int));
       if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
           _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
               _kvm_syserr(kd, 0, "could not read PTE");
               goto lose;
       }

       /*
        * Step 3: Validate the PTE and return the physical address.
        */
       if ((pte & cpu_kh->pg_v) == 0) {
               _kvm_err(kd, 0, "invalid translation (invalid PTE)");
               goto lose;
       }
       *pa = (((pte & cpu_kh->pg_frame) >> cpu_kh->pg_shift) << PGSHIFT) +
           page_off;
       return (NBPG - page_off);

lose:
       *pa = -1;
       return (0);
}

/*
* Translate a physical address to a file-offset in the crash dump.
*/
off_t
_kvm_pa2off(kvm_t *kd, paddr_t pa)
{
       cpu_kcore_hdr_t *cpu_kh;
       phys_ram_seg_t *ramsegs;
       off_t off;
       int i;

       cpu_kh = kd->cpu_data;
       ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh));

       off = 0;
       for (i = 0; i < cpu_kh->nmemsegs; i++) {
               if (pa >= ramsegs[i].start &&
                   (pa - ramsegs[i].start) < ramsegs[i].size) {
                       off += (pa - ramsegs[i].start);
                       break;
               }
               off += ramsegs[i].size;
       }

       return (kd->dump_off + off);
}

/*
* Machine-dependent initialization for ALL open kvm descriptors,
* not just those for a kernel crash dump.  Some architectures
* have to deal with these NOT being constants!  (i.e. m68k)
*/
int
_kvm_mdopen(kvm_t *kd)
{

       kd->min_uva = VM_MIN_ADDRESS;
       kd->max_uva = VM_MAXUSER_ADDRESS;

       return (0);
}

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