/*
 * CHU - driver for CH375 in disk mode
 * Copyright (C) 2024 Javier S. Pedro
 *
 * 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 3 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, see <https://www.gnu.org/licenses/>.
 */


#ifndef UTILS_H
#define UTILS_H

#include <stdint.h>

static inline __segment get_cs(void);
#pragma aux get_cs = "mov ax, cs" value [ax] modify exact [] nomemory

static inline __segment get_ds(void);
#pragma aux get_ds = "mov ax, ds" value [ax] modify exact [] nomemory

static void load_ds_from_cs(void);
#pragma aux load_ds_from_cs = \
	"push cs" \
	"pop ds" \
	__modify __exact []

#define SWAPNC_32(w)    (\
                            (((w) & 0x000000FFUL) << 24) |\
                            (((w) & 0x0000FF00UL) << 8) |\
                            (((w) & 0x00FF0000UL) >> 8) |\
                            (((w) & 0xFF000000UL) >> 24)\
                        )

static inline uint16_t div(uint32_t dividend, uint16_t divisor);
#pragma aux div = \
    "div bx" \
    __parm [dx ax] [bx] \
    __value [ax] \
    __modify __exact [dx ax]

static inline uint32_t mul(uint16_t a, uint16_t b);
#pragma aux mul = \
    "mul dx" \
    __parm [ax] [dx] \
    __value [dx ax] \
    __modify __exact [dx ax]



#endif // UTILS_H