mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
cff531af94
- PicoDrive was originally released by fDave with simple
"free for non-commercial use / For commercial use, separate licencing
terms must be obtained" license and I kept it in my releases.
- in 2011, fDave re-released his code (same that I used as base
many years ago) dual licensed with GPLv2 and MAME licenses:
https://code.google.com/p/cyclone68000/
Based on the above I now proclaim that the whole source code is licensed
under the MAME license as more elaborate form of "for non-commercial use".
If that raises any doubt, I announce that all my modifications (which
is the vast majority of code by now) is licensed under the MAME license,
as it reads in COPYING file in this commit.
This does not affect ym2612.c/sn76496.c that were MAME licensed already
from the beginning.
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*
|
|
* basic, incomplete SSP160x (SSP1601?) interpreter
|
|
*
|
|
* Copyright (c) Gražvydas "notaz" Ignotas, 2008
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * 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.
|
|
* * Neither the name of the organization nor the
|
|
* names of its contributors may be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
|
|
*/
|
|
|
|
// register names
|
|
enum {
|
|
SSP_GR0, SSP_X, SSP_Y, SSP_A,
|
|
SSP_ST, SSP_STACK, SSP_PC, SSP_P,
|
|
SSP_PM0, SSP_PM1, SSP_PM2, SSP_XST,
|
|
SSP_PM4, SSP_gr13, SSP_PMC, SSP_AL
|
|
};
|
|
|
|
typedef union
|
|
{
|
|
unsigned int v;
|
|
struct {
|
|
unsigned short l;
|
|
unsigned short h;
|
|
};
|
|
} ssp_reg_t;
|
|
|
|
typedef struct
|
|
{
|
|
union {
|
|
unsigned short RAM[256*2]; // 000 2 internal RAM banks
|
|
struct {
|
|
unsigned short RAM0[256];
|
|
unsigned short RAM1[256];
|
|
};
|
|
};
|
|
ssp_reg_t gr[16]; // 400 general registers
|
|
union {
|
|
unsigned char r[8]; // 440 BANK pointers
|
|
struct {
|
|
unsigned char r0[4];
|
|
unsigned char r1[4];
|
|
};
|
|
};
|
|
unsigned short stack[6]; // 448
|
|
unsigned int pmac_read[6]; // 454 read modes/addrs for PM0-PM5
|
|
unsigned int pmac_write[6]; // 46c write ...
|
|
//
|
|
#define SSP_PMC_HAVE_ADDR 0x0001 // address written to PMAC, waiting for mode
|
|
#define SSP_PMC_SET 0x0002 // PMAC is set
|
|
#define SSP_WAIT_PM0 0x2000 // bit1 in PM0
|
|
#define SSP_WAIT_30FE06 0x4000 // ssp tight loops on 30FE06 to become non-zero
|
|
#define SSP_WAIT_30FE08 0x8000 // same for 30FE06
|
|
#define SSP_WAIT_MASK 0xe000
|
|
unsigned int emu_status; // 484
|
|
/* used by recompiler only: */
|
|
struct {
|
|
unsigned int ptr_rom; // 488
|
|
unsigned int ptr_iram_rom; // 48c
|
|
unsigned int ptr_dram; // 490
|
|
unsigned int iram_dirty; // 494
|
|
unsigned int iram_context; // 498
|
|
unsigned int ptr_btable; // 49c
|
|
unsigned int ptr_btable_iram; // 4a0
|
|
unsigned int tmp0; // 4a4
|
|
unsigned int tmp1; // 4a8
|
|
unsigned int tmp2; // 4ac
|
|
} drc;
|
|
} ssp1601_t;
|
|
|
|
|
|
void ssp1601_reset(ssp1601_t *ssp);
|
|
void ssp1601_run(int cycles);
|
|
|