/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
 * 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 as
 *    the first lines of this file unmodified.
 * 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 AUTHORS ``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 AUTHORS 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.
 *
 */

#include <sys/cdefs.h>
#include "opt_syscons.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/fbio.h>
#include <sys/consio.h>

#include <machine/md_var.h>
#include <machine/bus.h>

#include <dev/fb/fbreg.h>
#include <dev/syscons/syscons.h>

#define vtb_wrap(vtb, at, offset)                               \
    (((at) + (offset) + (vtb)->vtb_size)%(vtb)->vtb_size)

void
sc_vtb_init(sc_vtb_t *vtb, int type, int cols, int rows, void *buf, int wait)
{
        vtb->vtb_flags = 0;
        vtb->vtb_type = type;
        vtb->vtb_cols = cols;
        vtb->vtb_rows = rows;
        vtb->vtb_size = cols*rows;
        vtb->vtb_buffer = 0;
        vtb->vtb_tail = 0;

        switch (type) {
        case VTB_MEMORY:
        case VTB_RINGBUFFER:
                if ((buf == NULL) && (cols*rows != 0)) {
                        vtb->vtb_buffer =
                                (vm_offset_t)malloc(cols*rows*sizeof(u_int16_t),
                                                    M_DEVBUF, 
                                                    (wait) ? M_WAITOK : M_NOWAIT);
                        if (vtb->vtb_buffer != 0) {
                                bzero((void *)sc_vtb_pointer(vtb, 0),
                                      cols*rows*sizeof(u_int16_t));
                                vtb->vtb_flags |= VTB_ALLOCED;
                        }
                } else {
                        vtb->vtb_buffer = (vm_offset_t)buf;
                }
                vtb->vtb_flags |= VTB_VALID;
                break;
        case VTB_FRAMEBUFFER:
                vtb->vtb_buffer = (vm_offset_t)buf;
                vtb->vtb_flags |= VTB_VALID;
                break;
        default:
                break;
        }
}

void
sc_vtb_destroy(sc_vtb_t *vtb)
{
        vm_offset_t p;

        vtb->vtb_cols = 0;
        vtb->vtb_rows = 0;
        vtb->vtb_size = 0;
        vtb->vtb_tail = 0;

        p = vtb->vtb_buffer;
        vtb->vtb_buffer = 0;
        switch (vtb->vtb_type) {
        case VTB_MEMORY:
        case VTB_RINGBUFFER:
                if ((vtb->vtb_flags & VTB_ALLOCED) && (p != 0))
                        free((void *)p, M_DEVBUF);
                break;
        default:
                break;
        }
        vtb->vtb_flags = 0;
        vtb->vtb_type = VTB_INVALID;
}

size_t
sc_vtb_size(int cols, int rows)
{
        return (size_t)(cols*rows*sizeof(u_int16_t));
}

int
sc_vtb_getc(sc_vtb_t *vtb, int at)
{
        if (vtb->vtb_type == VTB_FRAMEBUFFER)
                return (readw(sc_vtb_pointer(vtb, at)) & 0x00ff);
        else
                return (*(u_int16_t *)sc_vtb_pointer(vtb, at) & 0x00ff);
}

int
sc_vtb_geta(sc_vtb_t *vtb, int at)
{
        if (vtb->vtb_type == VTB_FRAMEBUFFER)
                return (readw(sc_vtb_pointer(vtb, at)) & 0xff00);
        else
                return (*(u_int16_t *)sc_vtb_pointer(vtb, at) & 0xff00);
}

void
sc_vtb_putc(sc_vtb_t *vtb, int at, int c, int a)
{
        if (vtb->vtb_type == VTB_FRAMEBUFFER)
                writew(sc_vtb_pointer(vtb, at), a | c);
        else
                *(u_int16_t *)sc_vtb_pointer(vtb, at) = a | c;
}

vm_offset_t
sc_vtb_putchar(sc_vtb_t *vtb, vm_offset_t p, int c, int a)
{
        if (vtb->vtb_type == VTB_FRAMEBUFFER)
                writew(p, a | c);
        else
                *(u_int16_t *)p = a | c;
        return (p + sizeof(u_int16_t));
}

vm_offset_t
sc_vtb_pointer(sc_vtb_t *vtb, int at)
{
        return (vtb->vtb_buffer + sizeof(u_int16_t)*(at));
}

int
sc_vtb_pos(sc_vtb_t *vtb, int pos, int offset)
{
        return ((pos + offset + vtb->vtb_size)%vtb->vtb_size);
}

void
sc_vtb_clear(sc_vtb_t *vtb, int c, int attr)
{
        if (vtb->vtb_type == VTB_FRAMEBUFFER)
                fillw_io(attr | c, sc_vtb_pointer(vtb, 0), vtb->vtb_size);
        else
                fillw(attr | c, (void *)sc_vtb_pointer(vtb, 0), vtb->vtb_size);
}

void
sc_vtb_copy(sc_vtb_t *vtb1, int from, sc_vtb_t *vtb2, int to, int count)
{
        /* XXX if both are VTB_VRAMEBUFFER... */
        if (vtb2->vtb_type == VTB_FRAMEBUFFER)
                bcopy_toio(sc_vtb_pointer(vtb1, from),
                           sc_vtb_pointer(vtb2, to),
                           count*sizeof(u_int16_t));
        else if (vtb1->vtb_type == VTB_FRAMEBUFFER)
                bcopy_fromio(sc_vtb_pointer(vtb1, from),
                             sc_vtb_pointer(vtb2, to),
                             count*sizeof(u_int16_t));
        else
                bcopy((void *)sc_vtb_pointer(vtb1, from),
                      (void *)sc_vtb_pointer(vtb2, to),
                      count*sizeof(u_int16_t));
}

void
sc_vtb_append(sc_vtb_t *vtb1, int from, sc_vtb_t *vtb2, int count)
{
        int len;

        if (vtb2->vtb_type != VTB_RINGBUFFER)
                return;

        while (count > 0) {
                len = imin(count, vtb2->vtb_size - vtb2->vtb_tail);
                if (vtb1->vtb_type == VTB_FRAMEBUFFER)
                        bcopy_fromio(sc_vtb_pointer(vtb1, from),
                                     sc_vtb_pointer(vtb2, vtb2->vtb_tail),
                                     len*sizeof(u_int16_t));
                else
                        bcopy((void *)sc_vtb_pointer(vtb1, from),
                              (void *)sc_vtb_pointer(vtb2, vtb2->vtb_tail),
                              len*sizeof(u_int16_t));
                from += len;
                count -= len;
                vtb2->vtb_tail = vtb_wrap(vtb2, vtb2->vtb_tail, len);
        }
}

void
sc_vtb_seek(sc_vtb_t *vtb, int pos)
{
        vtb->vtb_tail = pos%vtb->vtb_size;
}

void
sc_vtb_erase(sc_vtb_t *vtb, int at, int count, int c, int attr)
{
        if (at + count > vtb->vtb_size)
                count = vtb->vtb_size - at;
        if (vtb->vtb_type == VTB_FRAMEBUFFER)
                fillw_io(attr | c, sc_vtb_pointer(vtb, at), count);
        else
                fillw(attr | c, (void *)sc_vtb_pointer(vtb, at), count);
}

void
sc_vtb_move(sc_vtb_t *vtb, int from, int to, int count)
{
        if (from + count > vtb->vtb_size)
                count = vtb->vtb_size - from;
        if (to + count > vtb->vtb_size)
                count = vtb->vtb_size - to;
        if (count <= 0)
                return;
        if (vtb->vtb_type == VTB_FRAMEBUFFER)
                bcopy_io(sc_vtb_pointer(vtb, from),
                         sc_vtb_pointer(vtb, to), count*sizeof(u_int16_t)); 
        else
                bcopy((void *)sc_vtb_pointer(vtb, from),
                      (void *)sc_vtb_pointer(vtb, to), count*sizeof(u_int16_t));
}

void
sc_vtb_delete(sc_vtb_t *vtb, int at, int count, int c, int attr)
{
        int len;

        if (at + count > vtb->vtb_size)
                count = vtb->vtb_size - at;
        len = vtb->vtb_size - at - count;
        if (len > 0) {
                if (vtb->vtb_type == VTB_FRAMEBUFFER)
                        bcopy_io(sc_vtb_pointer(vtb, at + count),
                                 sc_vtb_pointer(vtb, at),
                                 len*sizeof(u_int16_t)); 
                else
                        bcopy((void *)sc_vtb_pointer(vtb, at + count),
                              (void *)sc_vtb_pointer(vtb, at),
                              len*sizeof(u_int16_t)); 
        }
        if (vtb->vtb_type == VTB_FRAMEBUFFER)
                fillw_io(attr | c, sc_vtb_pointer(vtb, at + len),
                         vtb->vtb_size - at - len);
        else
                fillw(attr | c, (void *)sc_vtb_pointer(vtb, at + len),
                      vtb->vtb_size - at - len);
}

void
sc_vtb_ins(sc_vtb_t *vtb, int at, int count, int c, int attr)
{
        if (at + count > vtb->vtb_size)
                count = vtb->vtb_size - at;
        else {
                if (vtb->vtb_type == VTB_FRAMEBUFFER)
                        bcopy_io(sc_vtb_pointer(vtb, at),
                                 sc_vtb_pointer(vtb, at + count),
                                 (vtb->vtb_size - at - count)*sizeof(u_int16_t)); 
                else
                        bcopy((void *)sc_vtb_pointer(vtb, at),
                              (void *)sc_vtb_pointer(vtb, at + count),
                              (vtb->vtb_size - at - count)*sizeof(u_int16_t)); 
        }
        if (vtb->vtb_type == VTB_FRAMEBUFFER)
                fillw_io(attr | c, sc_vtb_pointer(vtb, at), count);
        else
                fillw(attr | c, (void *)sc_vtb_pointer(vtb, at), count);
}