net_tulip: L80225 transceiver emulation

src/network/CMakeLists.txt

@@ -15,7 +15,7 @@
 set(net_sources)
 list(APPEND net_sources network.c net_pcap.c net_slirp.c net_dp8390.c net_3c501.c
     net_3c503.c net_ne2000.c net_pcnet.c net_wd8003.c net_plip.c net_event.c net_null.c
-    net_eeprom_nmc93cxx.c net_tulip.c net_rtl8139.c)
+    net_eeprom_nmc93cxx.c net_tulip.c net_rtl8139.c net_l80225.c)
 
 find_package(PkgConfig REQUIRED)
 pkg_check_modules(SLIRP REQUIRED IMPORTED_TARGET slirp)

src/network/net_l80225.c

@@ -0,0 +1,42 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <86box/86box.h>
+#include <86box/timer.h>
+#include <86box/pci.h>
+#include <86box/io.h>
+#include <86box/mem.h>
+#include <86box/dma.h>
+#include <86box/device.h>
+#include <86box/thread.h>
+#include <86box/network.h>
+
+uint16_t
+l80225_mii_readw(uint16_t* regs, uint16_t addr)
+{
+    switch (addr)
+    {
+        case 0x1:
+            return 0x782D;
+        case 0x2:
+            return 0b10110;
+        case 0x3:
+            return 0xF830;
+        case 0x5:
+            return 0x41E1;
+        case 0x18:
+            return 0xC0;
+        default:
+            return regs[addr];
+    }
+    return 0;
+}
+
+void
+l80225_mii_writew(uint16_t* regs, uint16_t addr, uint16_t val)
+{
+    regs[addr] = val;
+}

src/network/net_tulip.c

@@ -660,7 +660,7 @@ static const uint16_t tulip_mdi_default[] = {
     0x0000,
     0x0000,
     0x0000,
-    0x0000,
+    0x3800,
     0x0000,
     /* MDI Registers 16 - 31 */
     0x0003,
@@ -683,6 +683,7 @@ static const uint16_t tulip_mdi_default[] = {
 
 /* Readonly mask for MDI (PHY) registers */
 static const uint16_t tulip_mdi_mask[] = {
+    /* MDI Registers 0 - 6, 7 */
     0x0000,
     0xffff,
     0xffff,
@@ -691,6 +692,7 @@ static const uint16_t tulip_mdi_mask[] = {
     0xffff,
     0xffff,
     0x0000,
+    /* MDI Registers 8 - 15 */
     0x0000,
     0x0000,
     0x0000,
@@ -699,6 +701,7 @@ static const uint16_t tulip_mdi_mask[] = {
     0x0000,
     0x0000,
     0x0000,
+    /* MDI Registers 16 - 31 */
     0x0fff,
     0x0000,
     0xffff,
@@ -717,12 +720,15 @@ static const uint16_t tulip_mdi_mask[] = {
     0x0000,
 };
 
+extern uint16_t l80225_mii_readw(uint16_t* regs, uint16_t addr);
+extern void l80225_mii_writew(uint16_t* regs, uint16_t addr, uint16_t val);
+
 static uint16_t
 tulip_mii_read(TULIPState *s, int phy, int reg)
 {
     uint16_t ret = 0;
     if (phy == 1) {
-        ret = s->mii_regs[reg];
+        ret = l80225_mii_readw(s->mii_regs, reg);
     }
     return ret;
 }
@@ -734,8 +740,7 @@ tulip_mii_write(TULIPState *s, int phy, int reg, uint16_t data)
         return;
     }
 
-    s->mii_regs[reg] &= ~tulip_mdi_mask[reg];
-    s->mii_regs[reg] |= (data & tulip_mdi_mask[reg]);
+    return l80225_mii_writew(s->mii_regs, reg, data);
 }
 
 static void