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/* Xep128: Minimalistic Enterprise-128 emulator with focus on "exotic" hardware
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Copyright (C)2015,2016 LGB (Gábor Lénárt) <lgblgblgb@gmail.com>
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Partial Wiznet W5300 emulation, using the host OS (which runs the emulator)
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TCP/IP API. Thus, many of the W5300 features won't work, or limited, like:
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RAW mode, ICMP sockets, listening mode (it would be possible but eg in case
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of UNIX there would be a need for privilege, which is not so nice to
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run an emulator as "root" user), no IP/MAC setting (always uses the OS IP
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and MAC). DHCP and DNS is planned to "faked" so w5300 softwares trying to
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get IP address via DHCP or wanting resolve a DNS name would get an answer
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from this w5300 emulator instead of from the "real" network.
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Note: I've just discovered that FUSE Spectrum emulator does have some kind
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of w5100 emulation. Though w5100 and w5300 are not the very same, some things
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are similar, so their sources may help me in the future, thanks for their
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work (also a GNU/GPL software, so there is no license problem here).
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifdef CONFIG_W5300_SUPPORT
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//static Uint8 wmem[0x20000]; // 128K of internal RAM of w5300
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static Uint8 wregs[0x400]; // W5300 registers
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static Uint8 idm_ar0, idm_ar1, idm_ar;
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static Uint8 mr0, mr1;
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static void (*interrupt_cb)(int);
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static void update_interrupts ( void )
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int v = ((wregs[2] & wregs[4] & 0xF0) | (wregs[3] & wregs[5])) > 0;
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static Uint8 read_reg ( int addr )
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static void write_reg ( int addr, Uint8 data )
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wregs[addr] &= 255 - data;
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static void default_interrupt_callback ( int level ) {
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/* ---Interface functions --- */
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void w5300_reset ( void )
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memset(wregs, 0, sizeof wregs);
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mr0 = 0x38; mr1 = 0x00;
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idm_ar0 = 0; idm_ar1 = 0; idm_ar = 0;
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wregs[0x1C] = 0x07; wregs[0x1D] = 0xD0; // RTR retransmission timeout-period register
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wregs[0x1F] = 8; // RCR retransmission retry-count register
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memset(wregs + 0x20, 8, 16); // TX and RX mem size conf
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wregs[0x31] = 0xFF; // MTYPER1
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DEBUG("W5300: reset" NL);
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void w5300_init ( void (*cb)(int) )
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interrupt_cb = cb ? cb : default_interrupt_callback;
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DEBUG("W5300: init" NL);
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void w5300_shutdown ( void )
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DEBUG("W5300: shutdown pending connections (if any)" NL);
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void w5300_write_mr0 ( Uint8 data ) { // high byte of MR
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if (data & 1) ERROR_WINDOW("W5300: FIFO byte-order swap feature is not emulated");
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mr0 = data & 0x3F; // DBW and MPF bits cannot be overwritten by user
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void w5300_write_mr1 ( Uint8 data ) { // low byte of MR
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if (data & 128) { // software reset?
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w5300_shutdown(); // shuts down host OS connections, etc, emulator is being done
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if (data & 8) ERROR_WINDOW("W5300: PPPoE mode is not emulated");
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if (data & 4) ERROR_WINDOW("W5300: data bus byte-order swap feature is not emulated");
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if ((data & 1) == 0) ERROR_WINDOW("W5300: direct mode is NOT emulated, only indirect");
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void w5300_write_idm_ar0 ( Uint8 data ) { // high byte of address
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idm_ar = (idm_ar & 0xFF) | ((data & 0x3F) << 8);
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void w5300_write_idm_ar1 ( Uint8 data ) { // low byte of address
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idm_ar = (idm_ar & 0xFF00) | (data & 0xFE);
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void w5300_write_idm_dr0 ( Uint8 data ) { // high byte of adta
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write_reg(idm_ar, data);
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void w5300_write_idm_dr1 ( Uint8 data ) { // low byte of data
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write_reg(idm_ar | 1, data);
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Uint8 w5300_read_mr0 ( void ) {
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Uint8 w5300_read_mr1 ( void ) {
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Uint8 w5300_read_idm_ar0 ( void ) {
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Uint8 w5300_read_idm_ar1 ( void ) {
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Uint8 w5300_read_idm_dr0 ( void ) {
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return read_reg(idm_ar);
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Uint8 w5300_read_idm_dr1 ( void ) {
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return read_reg(idm_ar | 1);
added
removed
targets/ep128/w5300.c
