86Box/src/include/86box/dma.h

/*
 * 86Box    A hypervisor and IBM PC system emulator that specializes in
 *          running old operating systems and software designed for IBM
 *          PC systems and compatibles from 1981 through fairly recent
 *          system designs based on the PCI bus.
 *
 *          This file is part of the 86Box distribution.
 *
 *          Definitions for the Intel DMA controller.
 *
 *
 *
 * Authors: Fred N. van Kempen, <decwiz@yahoo.com>
 *          Miran Grca, <mgrca8@gmail.com>
 *          Sarah Walker, <https://pcem-emulator.co.uk/>
 *
 *          Copyright 2017-2020 Fred N. van Kempen.
 *          Copyright 2016-2020 Miran Grca.
 *          Copyright 2008-2020 Sarah Walker.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free  Software  Foundation; either  version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is  distributed in the hope that it will be useful, but
 * WITHOUT   ANY  WARRANTY;  without  even   the  implied  warranty  of
 * MERCHANTABILITY  or FITNESS  FOR A PARTICULAR  PURPOSE. See  the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the:
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place - Suite 330
 *   Boston, MA 02111-1307
 *   USA.
 */
#ifndef EMU_DMA_H
#define EMU_DMA_H

#define DMA_NODATA -1
#define DMA_OVER   0x10000
#define DMA_VERIFY 0x20000

typedef struct dma_t {
    uint8_t  m;
    uint8_t  mode;
    uint8_t  page;
    uint8_t  stat;
    uint8_t  stat_rq;
    uint8_t  command;
    uint8_t  ps2_mode;
    uint8_t  arb_level;
    uint8_t  sg_command;
    uint8_t  sg_status;
    uint8_t  ptr0;
    uint8_t  enabled;
    uint8_t  ext_mode;
    uint8_t  page_l;
    uint8_t  page_h;
    uint8_t  pad;
    uint16_t cb;
    uint16_t io_addr;
    uint16_t base;
    uint16_t transfer_mode;
    uint32_t ptr;
    uint32_t ptr_cur;
    uint32_t addr;
    uint32_t ab;
    uint32_t ac;
    int      cc;
    int      wp;
    int      size;
    int      count;
    int      eot;
} dma_t;

extern dma_t   dma[8];
extern uint8_t dma_e;
extern uint8_t dma_m;

extern void dma_init(void);
extern void dma16_init(void);
extern void ps2_dma_init(void);
extern void dma_reset(void);
extern int  dma_mode(int channel);

extern void    readdma0(void);
extern int     readdma1(void);
extern uint8_t readdma2(void);
extern int     readdma3(void);

extern void writedma2(uint8_t temp);

extern int  dma_get_drq(int channel);
extern void dma_set_drq(int channel, int set);

extern int dma_channel_read(int channel);
extern int dma_channel_write(int channel, uint16_t val);

extern void dma_alias_set(void);
extern void dma_alias_set_piix(void);
extern void dma_alias_remove(void);
extern void dma_alias_remove_piix(void);

extern void dma_bm_read(uint32_t PhysAddress, uint8_t *DataRead, uint32_t TotalSize, int TransferSize);
extern void dma_bm_write(uint32_t PhysAddress, const uint8_t *DataWrite, uint32_t TotalSize, int TransferSize);

void dma_set_params(uint8_t advanced, uint32_t mask);
void dma_set_mask(uint32_t mask);

void dma_set_at(uint8_t at);

void dma_ext_mode_init(void);
void dma_high_page_init(void);

void dma_remove_sg(void);
void dma_set_sg_base(uint8_t sg_base);

#endif /*EMU_DMA_H*/