/* $NetBSD: machdep.c,v 1.58 2022/01/01 21:07:14 andvar Exp $ */

/*-
 * Copyright (c) 2011 Reinoud Zandijk <reinoud@netbsd.org>
 * Copyright (c) 2007 Jared D. McNeill <jmcneill@invisible.ca>
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * Note that this machdep.c uses the `dummy' mcontext_t defined for usermode.
 * This is basically a blob of PAGE_SIZE big. We might want to switch over to
 * non-generic mcontext_t's one day, but will this break non-NetBSD hosts?
 */


#include "opt_memsize.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.58 2022/01/01 21:07:14 andvar Exp $");

#include <sys/types.h>
#include <sys/systm.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/exec.h>
#include <sys/buf.h>
#include <sys/boot_flag.h>
#include <sys/ucontext.h>
#include <sys/utsname.h>
#include <machine/pcb.h>
#include <machine/psl.h>

#include <uvm/uvm_extern.h>
#include <uvm/uvm_page.h>

#include <dev/mm.h>
#include <machine/vmparam.h>
#include <machine/machdep.h>
#include <machine/mainbus.h>
#include <machine/thunk.h>
#include <machine/cpu.h>
#include <sys/kgdb.h>

#include "opt_ddb.h"
#include "opt_kgdb.h"

#ifndef MAX_DISK_IMAGES
#define MAX_DISK_IMAGES 4
#endif

#ifndef MAX_VDEVS
#define MAX_VDEVS 4
#endif

char machine[_SYS_NMLN] = "";
char machine_arch[_SYS_NMLN] = "";
char module_machine_usermode[_SYS_NMLN] = "";

struct vm_map *phys_map = NULL;

static char **saved_argv;

char *usermode_disk_image_path[MAX_DISK_IMAGES];
int usermode_disk_image_path_count = 0;

int   usermode_vdev_type[MAX_VDEVS];
char *usermode_vdev_path[MAX_VDEVS];
int usermode_vdev_count = 0;

static char usermode_tap_devicebuf[PATH_MAX] = "";
char *usermode_tap_device = NULL;
char *usermode_tap_eaddr = NULL;
static char usermode_audio_devicebuf[PATH_MAX] = "";
char *usermode_audio_device = NULL;
char *usermode_root_device = NULL;
int usermode_vnc_width = 0;
int usermode_vnc_height = 0;
int usermode_vnc_port = -1;

void    main(int argc, char *argv[]);
void    usermode_reboot(void);

static void
usage(const char *pn)
{
        thunk_printf("usage: %s [-acdqsvxz]"
            " [net=<tapdev>,<eaddr>]"
            " [audio=<audiodev>]"
            " [disk=<diskimg> ...]"
            " [root=<device>]"
            " [vnc=<width>x<height>,<port>]"
            " [vdev=atapi,device]\n",
            pn);
        thunk_printf("       (ex. \"%s"
            " net=tap0,00:00:be:ef:ca:fe"
            " audio=audio0"
            " disk=root.fs"
            " root=ld0"
            " vnc=640x480,5900"
            " vdev=atapi,/dev/rcd0d\")\n", pn);
}


static int
vdev_type(const char *type)
{
        if (strcasecmp(type, "atapi")==0)
                return THUNKBUS_TYPE_VATAPI;
#if 0
        if (strcasecmp(type, "scsi")==0)
                return THUNKBUS_TYPE_VSCSI;
#endif
        return -1;
}


void
main(int argc, char *argv[])
{
        extern void ttycons_consinit(void);
        extern void pmap_bootstrap(void);
        extern void kernmain(void);
        int type, i, j, r, tmpopt = 0;

        saved_argv = argv;

        /* Get machine and machine_arch from host */
        thunk_getmachine(machine, sizeof(machine),
            machine_arch, sizeof(machine_arch));
        /* Override module_machine to be ${machine}usermode */
        snprintf(module_machine_usermode, sizeof(module_machine_usermode),
            "%susermode", machine);

        ttycons_consinit();

        for (i = 1; i < argc; i++) {
                if (argv[i][0] != '-') {
                        if (strncmp(argv[i], "net=", strlen("net=")) == 0) {
                                char *tap = argv[i] + strlen("net=");
                                char *mac = strchr(tap, ',');
                                char *p = usermode_tap_devicebuf;
                                if (mac == NULL) {
                                        thunk_printf("bad net= format\n");
                                        return;
                                }
                                memset(usermode_tap_devicebuf, 0,
                                    sizeof(usermode_tap_devicebuf));
                                if (*tap != '/') {
                                        memcpy(p, "/dev/", strlen("/dev/"));
                                        p += strlen("/dev/");
                                }
                                for (; *tap != ','; p++, tap++)
                                        *p = *tap;
                                usermode_tap_device = usermode_tap_devicebuf;
                                usermode_tap_eaddr = mac + 1;
                        } else if (strncmp(argv[i], "audio=",
                            strlen("audio=")) == 0) {
                                char *audio = argv[i] + strlen("audio=");
                                if (*audio != '/')
                                        snprintf(usermode_audio_devicebuf,
                                            sizeof(usermode_audio_devicebuf),
                                            "/dev/%s", audio);
                                else
                                        snprintf(usermode_audio_devicebuf,
                                            sizeof(usermode_audio_devicebuf),
                                            "%s", audio);
                                usermode_audio_device =
                                    usermode_audio_devicebuf;
                        } else if (strncmp(argv[i], "vnc=",
                            strlen("vnc=")) == 0) {
                                char *vnc = argv[i] + strlen("vnc=");
                                char *w, *h, *p;
                                w = vnc;
                                h = strchr(w, 'x');
                                if (h == NULL) {
                                        thunk_printf("bad vnc= format\n");
                                        return;
                                }
                                *h++ = '\0';
                                p = strchr(h, ',');
                                if (p == NULL) {
                                        thunk_printf("bad vnc= format\n");
                                        return;
                                }
                                *p++ = '\0';
                                usermode_vnc_width = strtoul(w, NULL, 10);
                                usermode_vnc_height = strtoul(h, NULL, 10);
                                usermode_vnc_port = strtoul(p, NULL, 10);
                        } else if (strncmp(argv[i], "disk=",
                            strlen("disk=")) == 0) {
                                if (usermode_disk_image_path_count ==
                                    MAX_DISK_IMAGES) {
                                        thunk_printf("too many disk images "
                                            "(increase MAX_DISK_IMAGES)\n");
                                        usage(argv[0]);
                                        return;
                                }
                                usermode_disk_image_path[
                                    usermode_disk_image_path_count++] =
                                    argv[i] + strlen("disk=");
                        } else if (strncmp(argv[i], "vdev=",
                            strlen("vdev=")) == 0) {
                                char *vdev = argv[i] + strlen("vdev=");
                                char *t, *p;
                                if (usermode_disk_image_path_count ==
                                    MAX_VDEVS) {
                                        thunk_printf("too many vdevs "
                                            "(increase MAX_VDEVS)\n");
                                        usage(argv[0]);
                                        return;
                                }
                                t = vdev;
                                p = strchr(t, ',');
                                if (p == NULL) {
                                        thunk_printf("bad vdev= format\n");
                                        return;
                                }
                                *p++ = '\0';
                                type = vdev_type(t);
                                if (type < 0) {
                                        thunk_printf("unknown vdev device type\n");
                                        return;
                                }
                                usermode_vdev_type[usermode_vdev_count] = type;
                                usermode_vdev_path[usermode_vdev_count] = p;
                                usermode_vdev_count++;
                        } else if (strncmp(argv[i], "root=",
                            strlen("root=")) == 0) {
                                usermode_root_device = argv[i] +
                                    strlen("root=");
                        } else {
                                thunk_printf("%s: unknown parameter\n", argv[i]);
                                usage(argv[0]);
                                return;
                        }
                        continue;
                }
                for (j = 1; argv[i][j] != '\0'; j++) {
                        r = 0;
                        BOOT_FLAG(argv[i][j], r);
                        if (r == 0) {
                                thunk_printf("unknown kernel boot flag '%c'\n", argv[i][j]);
                                usage(argv[0]);
                                return;
                        }
                        tmpopt |= r;
                }
        }
        boothowto = tmpopt;

        uvm_md_init();
        uvmexp.ncolors = 2;

        pmap_bootstrap();

        splinit();
        splraise(IPL_HIGH);

#ifdef DDB
        if (boothowto & RB_KDB)
                Debugger();
#endif
#ifdef KGDB
        if (boothowto & RB_KDB) {
                kgdb_port_init();
                kgdb_debug_init = 1;
                kgdb_connect(1);
        }
#endif

        kernmain();
}

void
usermode_reboot(void)
{
        struct thunk_itimerval itimer;

        /* make sure the timer is turned off */
        memset(&itimer, 0, sizeof(itimer));
        thunk_setitimer(ITIMER_REAL, &itimer, NULL);

        if (thunk_execv(saved_argv[0], saved_argv) == -1)
                thunk_abort();
        /* NOTREACHED */
}

void
setstatclockrate(int arg)
{
}

void
consinit(void)
{
//      kgdb_connect(0);
        printf("NetBSD/usermode startup\n");
}

int
mm_md_physacc(paddr_t pa, vm_prot_t prot)
{
        // printf("%s: pa = %p, acc %d\n", __func__, (void *) pa, prot);
        if (pa >= physmem * PAGE_SIZE)
                return EFAULT;
        return 0;
}


int
mm_md_kernacc(void *ptr, vm_prot_t prot, bool *handled)
{
        const vaddr_t va = (vaddr_t)ptr;
        extern void *end;

        // printf("%s: ptr %p, acc %d\n", __func__, ptr, prot);
        if (va < kmem_kvm_start)
                return EFAULT;
        if ((va >= kmem_kvm_cur_end) && (va < kmem_k_start))
                return EFAULT;
        if (va > (vaddr_t) end)
                return EFAULT;

        *handled = true;
        return 0;
}