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diff --git a/src/mame/machine/awboard.cpp b/src/mame/machine/awboard.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert,Andreas Naive
+
+#include "emu.h"
+#include "awboard.h"
+#include <algorithm>
+
+/*
+
+Atomiswave ROM board specs from Cah4e3 @ http://cah4e3.wordpress.com/2009/07/26/some-atomiswave-info/
+
+ AW_EPR_OFFSETL Register addres: 0x5f7000
+ +-------------------------------------------------------------------------------+
+ | bit15-0 |
+ +-------------------------------------------------------------------------------+
+ | EPR data offset low word |
+ +-------------------------------------------------------------------------------+
+
+ AW_EPR_OFFSETH Register addres: 0x5f7004
+ +-------------------------------------------------------------------------------+
+ | bit15-0 |
+ +-------------------------------------------------------------------------------+
+ | EPR data offset hi word |
+ +-------------------------------------------------------------------------------+
+
+ Both low and high words of 32-bit offset from start of EPR-ROM area. Used for
+ reading header and program code data, cannot be used for reading MPR-ROMs data.
+
+ AW_MPR_RECORD_INDEX Register addres: 0x5f700c
+ +-------------------------------------------------------------------------------+
+ | bit15-0 |
+ +-------------------------------------------------------------------------------+
+ | File system record index |
+ +-------------------------------------------------------------------------------+
+
+ This register contains index of MPR-ROM file system record (64-bytes in size) to
+ read throught DMA. Internal DMA offset register is assigned as AW_MPR_RECORD_INDEX<<6
+ from start of MPR-ROM area. Size of DMA transaction not limited, it is possible
+ to read any number of records or just part of it.
+
+ AW_MPR_FIRST_FILE_INDEX Register addres: 0x5f7010
+ +-------------------------------------------------------------------------------+
+ | bit15-0 |
+ +-------------------------------------------------------------------------------+
+ | First file record index |
+ +-------------------------------------------------------------------------------+
+
+ This register assign for internal cart circuit index of record in MPR-ROM file
+ system sub-area that contain information about first file of MPR-ROM files
+ sub-area. Internal circuit using this record to read absolute first file offset
+ from start of MPR-ROM area and calculate normal offset for each other file
+ requested, since MPR-ROM file data sub-area can be assighed only with relative
+ offsets from start of such sub-area.
+
+ AW_MPR_FILE_OFFSETL Register addres: 0x5f7014
+ +-------------------------------------------------------------------------------+
+ | bit15-0 |
+ +-------------------------------------------------------------------------------+
+ | MPR file offset low word |
+ +-------------------------------------------------------------------------------+
+
+ AW_MPR_FILE_OFFSETH Register addres: 0x5f7018
+ +-------------------------------------------------------------------------------+
+ | bit15-0 |
+ +-------------------------------------------------------------------------------+
+ | MPR file offset hi word |
+ +-------------------------------------------------------------------------------+
+
+ Both low and high words of 32-bit relative offset from start of MPR-ROM files
+ sub-area. Used by internal circuit to calculate absolute offset using data
+ from AW_MPR_FIRST_FILE_INDEX register. Cannot be used for reading EPR-ROM
+ data nor even MPR-ROM file system sub-area data.
+
+ AW_PIO_DATA Register addres: 0x5f7080
+ +-------------------------------------------------------------------------------+
+ | bit15-0 |
+ +-------------------------------------------------------------------------------+
+ | Read/Write word from/to ROM board address space |
+ +-------------------------------------------------------------------------------+
+
+ Using this register data can be read or written to ROM BD at AW_EPR_OFFSET directly,
+ decryption is not used, flash ROMs (re)programming via CFI commands possible.
+
+ Type 2 ROM BD have MPR_BANK register at AW_EPR_OFFSET 007fffff, which selects
+ 1 of 4 mask ROM banks.
+
+ROM board internal layouts:
+
+ Type 1:
+
+ 00000000 - 00800000 IC18 flash ROM
+ 00800000 - 01000000 unk, probably mirror of above
+ 01000000 - 02000000 IC10 \
+ ..... mask ROMs
+ 07000000 - 08000000 IC17 /
+
+ Type 2:
+
+ 00000000 - 00800000 FMEM1 flash ROM
+ 00800000 - 01000000 FMEM2 flash ROM
+ 01000000 - 02000000 unk, probably mirror of above
+ 02000000 - 04000000 MROM1 MROM4 MROM7 MROM10 \
+ 04000000 - 06000000 MROM2 MROM5 MROM8 MROM11 banked mask ROMs
+ 06000000 - 08000000 MROM3 MROM6 MROM9 MROM12 /
+
+ Type 3:
+
+ 00000000 - 01000000 U3 flash ROM
+ 01000000 - 02000000 U1 flash ROM
+ 02000000 - 03000000 U4 flash ROM
+ 03000000 - 04000000 U2 flash ROM
+ 04000000 - 05000000 U15 flash ROM
+ 05000000 - 06000000 U17 flash ROM
+ 06000000 - 07000000 U14 flash ROM
+ 07000000 - 08000000 U16 flash ROM
+
+ Development:
+
+ 00000000 - 00800000 IC12 \
+ ..... flash ROMs
+ 07800000 - 08000000 IC27 /
+
+
+ In short:
+
+ EPR-ROM
+ +--------------+ 0x00000000
+ | |
+ | HEADER +- AW_EPR_OFFSET << 1
+ | |
+ +--------------+
+ | |
+ | CODE +- AW_EPR_OFFSET << 1
+ | |
+ | |
+ +--------------+ 0x007fffff
+
+ MPR-ROMS
+ +--------------+ 0x00000000
+ | FS_HEADER |
+ | FS_RECORD[1] +- (AW_MPR_RECORD_INDEX << 6)
+ | FS_RECORD[2] |
+ | FS_RECORD[3] +- (AW_MPR_FIRST_FILE_INDEX << 6)
+ | ... |
+ | FS_RECORD[N] |
+ +--------------+- FS_RECORD[AW_MPR_FIRST_FILE_INDEX].FILE_ABS_OFFSET
+ | FILE_0 |
+ | FILE_1 +- (AW_MPR_FILE_OFFSET << 1) + FS_RECORD[AW_MPR_FIRST_FILE_INDEX].FILE_ABS_OFFSET
+ | ... |
+ | FILE_N |
+ +--------------+ 0x07ffffff
+
+*/
+
+const device_type AW_ROM_BOARD = &device_creator<aw_rom_board>;
+
+DEVICE_ADDRESS_MAP_START(submap, 16, aw_rom_board)
+ AM_RANGE(0x00, 0x01) AM_WRITE(epr_offsetl_w)
+ AM_RANGE(0x02, 0x03) AM_WRITE(epr_offseth_w)
+ AM_RANGE(0x06, 0x07) AM_WRITE(mpr_record_index_w)
+ AM_RANGE(0x08, 0x09) AM_WRITE(mpr_first_file_index_w)
+ AM_RANGE(0x0a, 0x0b) AM_WRITE(mpr_file_offsetl_w)
+ AM_RANGE(0x0c, 0x0d) AM_WRITE(mpr_file_offseth_w)
+ AM_RANGE(0x40, 0x41) AM_READWRITE(pio_r, pio_w)
+ADDRESS_MAP_END
+
+aw_rom_board::aw_rom_board(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : naomi_g1_device(mconfig, AW_ROM_BOARD, "Sammy Atomiswave ROM Board", tag, owner, clock, "aw_rom_board", __FILE__)
+{
+ keyregion = 0;
+}
+
+void aw_rom_board::static_set_keyregion(device_t &device, const char *_keyregion)
+{
+ aw_rom_board &dev = downcast<aw_rom_board &>(device);
+ dev.keyregion = _keyregion;
+}
+
+
+/*
+We are using 20 bits keys with the following subfields' structure:
+bits 0-15 is a 16-bits XOR
+bits 17-16 is a index to the sboxes table
+bits 19-18 is a index to the permutation table
+
+These subfields could be differing from the "real" ones in the following ways:
+- Every one of the index subfields could be suffering an arbitrary bitswap and XOR
+- The 16-bits-XOR subfield could suffer an arbitrary XOR which could depend on the 4 index bits (that is: a different XOR per every index combination)
+- Of course, the way in which we are mixing 3 subfields in one only key is arbitrary too.
+
+The keys are stored as 32-bits big-endian values in a file.
+*/
+
+
+const int aw_rom_board::permutation_table[4][16] =
+{
+ {8,10,1,3,7,4,11,2,5,15,6,0,12,13,9,14},
+ {4,5,9,6,1,13,7,11,10,0,14,12,8,15,2,3},
+ {12,7,11,2,0,5,15,6,1,8,14,4,9,13,3,10},
+ {14,1,11,15,7,3,8,13,0,4,2,12,6,10,5,9}
+};
+
+const aw_rom_board::sbox_set aw_rom_board::sboxes_table[4] =
+{
+ {
+ {4,12,8,14,16,30,31,0,23,29,24,21,11,22,27,5,3,20,18,26,10,7,17,1,28,6,15,13,2,9,25,19},
+ {13,1,0,9,5,12,4,14,3,15,2,10,11,6,8,7},
+ {7,13,4,6,5,9,3,2,0,15,12,10,8,11,1,14},
+ {4,0,1,2,5,7,3,6}
+ },
+ {
+ {3,0,14,17,10,15,31,20,13,2,29,28,9,18,25,27,6,19,30,22,7,12,1,16,23,11,24,4,8,26,21,5},
+ {2,10,6,9,11,13,4,5,3,15,7,14,12,1,0,8},
+ {1,13,11,3,8,7,9,10,12,15,4,14,0,5,6,2},
+ {6,5,0,3,7,1,4,2}
+ },
+ {
+ {9,15,28,7,13,24,2,23,21,1,22,16,18,8,17,31,27,6,30,12,4,20,5,19,0,25,3,29,10,14,11,26},
+ {5,2,13,11,8,6,12,1,4,3,0,10,14,15,7,9},
+ {11,6,10,0,12,1,8,14,2,9,13,3,7,4,15,5},
+ {1,5,6,2,4,7,3,0}
+ },
+ {
+ {17,3,31,2,28,10,9,29,6,25,24,8,13,1,19,15,22,0,14,20,16,7,21,4,18,26,27,5,12,23,11,30},
+ {4,8,11,15,3,14,7,12,1,0,9,5,6,13,2,10},
+ {14,0,9,11,4,1,7,5,13,6,8,12,2,3,10,15},
+ {2,1,0,5,4,6,7,3}
+ },
+};
+
+UINT16 aw_rom_board::decrypt(UINT16 cipherText, UINT32 address, const UINT32 key)
+{
+ UINT8 b0,b1,b2,b3;
+ UINT16 aux;
+ const int* pbox = permutation_table[key>>18];
+ const sbox_set* ss = &sboxes_table[(key>>16)&3];
+
+ aux = BITSWAP16(cipherText,
+ pbox[15],pbox[14],pbox[13],pbox[12],pbox[11],pbox[10],pbox[9],pbox[8],
+ pbox[7],pbox[6],pbox[5],pbox[4],pbox[3],pbox[2],pbox[1],pbox[0]);
+ aux = aux ^ BITSWAP16(address, 13,5,2, 14,10,9,4, 15,11,6,1, 12,8,7,3,0);
+
+ b0 = aux&0x1f;
+ b1 = (aux>>5)&0xf;
+ b2 = (aux>>9)&0xf;
+ b3 = aux>>13;
+
+ b0 = ss->S0[b0];
+ b1 = ss->S1[b1];
+ b2 = ss->S2[b2];
+ b3 = ss->S3[b3];
+
+ return ((b3<<13)|(b2<<9)|(b1<<5)|b0)^(key&0xffff);
+}
+
+void aw_rom_board::set_key()
+{
+ if(!m_region)
+ throw emu_fatalerror("AW-ROM-BOARD: region %s is missing\n", tag());
+
+ if(!keyregion)
+ return;
+
+ memory_region *kr = memregion(keyregion);
+ if(!kr)
+ return;
+
+ if(kr->bytes() != 4)
+ throw emu_fatalerror("AW-ROM-BOARD: key region %s has incorrect size (%d, expected 4)\n", keyregion, kr->bytes());
+
+ const UINT8 *krp = kr->base();
+ rombd_key = (krp[0] << 24) | (krp[1] << 16) | (krp[2] << 8) | krp[3];
+}
+
+void aw_rom_board::device_start()
+{
+ naomi_g1_device::device_start();
+ set_key();
+
+ mpr_offset = decrypt16(0x58/2) | (decrypt16(0x5a/2) << 16);
+
+ save_item(NAME(epr_offset));
+ save_item(NAME(mpr_record_index));
+ save_item(NAME(mpr_first_file_index));
+ save_item(NAME(mpr_file_offset));
+ save_item(NAME(dma_offset));
+ save_item(NAME(dma_limit));
+ save_item(NAME(mpr_bank));
+}
+
+void aw_rom_board::device_reset()
+{
+ naomi_g1_device::device_reset();
+ epr_offset = 0;
+ mpr_record_index = 0;
+ mpr_first_file_index = 0;
+ mpr_file_offset = 0;
+ mpr_bank = 0;
+
+ dma_offset = 0;
+ dma_limit = 0;
+}
+
+READ16_MEMBER(aw_rom_board::pio_r)
+{
+ UINT32 roffset = epr_offset & 0x3ffffff;
+ if (roffset >= (mpr_offset / 2))
+ roffset += mpr_bank * 0x4000000;
+ UINT16 retval = (m_region->bytes() > roffset) ? m_region->u16(roffset) : 0;
+ epr_offset++;
+ return retval;
+}
+
+WRITE16_MEMBER(aw_rom_board::pio_w)
+{
+ // write to ROM board address space, including FlashROM programming using CFI (TODO)
+ if (epr_offset == 0x7fffff)
+ mpr_bank = data & 3;
+ epr_offset++;
+}
+
+WRITE16_MEMBER(aw_rom_board::epr_offsetl_w)
+{
+ epr_offset = (epr_offset & 0xffff0000) | data;
+ recalc_dma_offset(EPR);
+}
+
+WRITE16_MEMBER(aw_rom_board::epr_offseth_w)
+{
+ epr_offset = (epr_offset & 0x0000ffff) | (data << 16);
+ recalc_dma_offset(EPR);
+}
+
+WRITE16_MEMBER(aw_rom_board::mpr_record_index_w)
+{
+ mpr_record_index = data;
+ recalc_dma_offset(MPR_RECORD);
+}
+
+WRITE16_MEMBER(aw_rom_board::mpr_first_file_index_w)
+{
+ mpr_first_file_index = data;
+ recalc_dma_offset(MPR_FILE);
+}
+
+WRITE16_MEMBER(aw_rom_board::mpr_file_offsetl_w)
+{
+ mpr_file_offset = (mpr_file_offset & 0xffff0000) | data;
+ recalc_dma_offset(MPR_FILE);
+}
+
+WRITE16_MEMBER(aw_rom_board::mpr_file_offseth_w)
+{
+ mpr_file_offset = (mpr_file_offset & 0x0000ffff) | (data << 16);
+
+ recalc_dma_offset(MPR_FILE);
+}
+
+void aw_rom_board::recalc_dma_offset(int mode)
+{
+ switch(mode) {
+ case EPR:
+ dma_offset = epr_offset * 2;
+ dma_limit = mpr_offset;
+ break;
+
+ case MPR_RECORD:
+ dma_offset = mpr_offset + mpr_record_index * 0x40;
+ dma_limit = std::min((UINT32)0x8000000, m_region->bytes());
+ break;
+
+ case MPR_FILE: {
+ UINT32 filedata_offs = (mpr_bank * 0x8000000 + mpr_offset + mpr_first_file_index * 0x40 + 8) / 2;
+ dma_offset = decrypt16(filedata_offs) | (decrypt16(filedata_offs + 1) << 16);
+ dma_offset = (mpr_offset + dma_offset + mpr_file_offset * 2) & 0x7ffffff;
+ dma_limit = std::min((UINT32)0x8000000, m_region->bytes());
+ break;
+ }
+ }
+
+ if (dma_offset >= mpr_offset) {
+ UINT32 bank_base = mpr_bank * 0x8000000;
+ dma_offset += bank_base;
+ dma_limit = std::min(dma_limit + bank_base, m_region->bytes());
+ }
+}
+
+void aw_rom_board::dma_get_position(UINT8 *&base, UINT32 &limit, bool to_mainram)
+{
+ if(!to_mainram) {
+ limit = 0;
+ base = 0;
+ return;
+ }
+
+ UINT32 offset = dma_offset / 2;
+ for (int i = 0; i < 16; i++)
+ decrypted_buf[i] = decrypt16(offset + i);
+ base = (UINT8*)decrypted_buf;
+ limit = 32;
+}
+
+void aw_rom_board::dma_advance(UINT32 size)
+{
+ dma_offset += size;
+}