pcnet nic support (Antony T Curtis)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2036 c046a42c-6fe2-441c-8c8c-71466251a162

4 files changed, 1778 insertions, 1 deletions

diff --git a/Makefile.target b/Makefile.target
index 169ab775a6..d60e6b832e 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -329,7 +329,7 @@ VL_OBJS+= scsi-disk.o cdrom.o lsi53c895a.o
 VL_OBJS+= usb.o usb-hub.o usb-linux.o usb-hid.o usb-ohci.o usb-msd.o
 
 # PCI network cards
-VL_OBJS+= ne2000.o rtl8139.o
+VL_OBJS+= ne2000.o rtl8139.o pcnet.o
 
 ifeq ($(TARGET_BASE_ARCH), i386)
 # Hardware support
diff --git a/hw/pci.c b/hw/pci.c
index ebe606814c..f58f6fd60c 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -493,6 +493,8 @@ void pci_nic_init(PCIBus *bus, NICInfo *nd)
         pci_ne2000_init(bus, nd);
     } else if (strcmp(nd->model, "rtl8139") == 0) {
         pci_rtl8139_init(bus, nd);
+    } else if (strcmp(nd->model, "pcnet") == 0) {
+        pci_pcnet_init(bus, nd);
     } else {
         fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd->model);
         exit (1);
diff --git a/hw/pcnet.c b/hw/pcnet.c
new file mode 100644
index 0000000000..1200581628
--- /dev/null
+++ b/hw/pcnet.c
@@ -0,0 +1,1771 @@
+/*
+ * QEMU AMD PC-Net II (Am79C970A) emulation
+ * 
+ * Copyright (c) 2004 Antony T Curtis
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+ 
+/* This software was written to be compatible with the specification:
+ * AMD Am79C970A PCnet-PCI II Ethernet Controller Data-Sheet
+ * AMD Publication# 19436  Rev:E  Amendment/0  Issue Date: June 2000
+ */
+ 
+#include "vl.h"
+
+/* XXX: suppress those headers */
+#include <sys/times.h>
+#include <arpa/inet.h>
+#include <net/ethernet.h>
+
+//#define PCNET_DEBUG
+//#define PCNET_DEBUG_IO
+//#define PCNET_DEBUG_BCR
+//#define PCNET_DEBUG_CSR
+//#define PCNET_DEBUG_RMD
+//#define PCNET_DEBUG_TMD
+//#define PCNET_DEBUG_MATCH
+
+
+#define PCNET_IOPORT_SIZE       0x20
+#define PCNET_PNPMMIO_SIZE      0x20
+
+
+typedef struct PCNetState_st PCNetState;
+
+struct PCNetState_st {
+    PCIDevice dev;
+    VLANClientState *vc;
+    NICInfo *nd;
+    QEMUTimer *poll_timer;
+    int mmio_io_addr, rap, isr, lnkst;
+    target_phys_addr_t rdra, tdra;
+    uint8_t prom[16];
+    uint16_t csr[128];
+    uint16_t bcr[32];
+    uint64_t timer;
+    int xmit_pos, recv_pos;
+    uint8_t buffer[4096];
+};
+
+#ifdef __GNUC__
+#define PACKED(A) A __attribute__ ((packed))
+#else
+#error FixMe
+#endif
+
+/* BUS CONFIGURATION REGISTERS */
+#define BCR_MSRDA    0
+#define BCR_MSWRA    1
+#define BCR_MC       2
+#define BCR_LNKST    4
+#define BCR_LED1     5
+#define BCR_LED2     6
+#define BCR_LED3     7
+#define BCR_FDC      9
+#define BCR_BSBC     18
+#define BCR_EECAS    19
+#define BCR_SWS      20
+#define BCR_PLAT     22
+
+#define BCR_DWIO(S)      !!((S)->bcr[BCR_BSBC] & 0x0080)
+#define BCR_SSIZE32(S)   !!((S)->bcr[BCR_SWS ] & 0x0100)
+#define BCR_SWSTYLE(S)     ((S)->bcr[BCR_SWS ] & 0x00FF)
+
+#define CSR_INIT(S)      !!(((S)->csr[0])&0x0001)
+#define CSR_STRT(S)      !!(((S)->csr[0])&0x0002)
+#define CSR_STOP(S)      !!(((S)->csr[0])&0x0004)
+#define CSR_TDMD(S)      !!(((S)->csr[0])&0x0008)
+#define CSR_TXON(S)      !!(((S)->csr[0])&0x0010)
+#define CSR_RXON(S)      !!(((S)->csr[0])&0x0020)
+#define CSR_INEA(S)      !!(((S)->csr[0])&0x0040)
+#define CSR_LAPPEN(S)    !!(((S)->csr[3])&0x0020)
+#define CSR_DXSUFLO(S)   !!(((S)->csr[3])&0x0040)
+#define CSR_ASTRP_RCV(S) !!(((S)->csr[4])&0x0800)
+#define CSR_DPOLL(S)     !!(((S)->csr[4])&0x1000)
+#define CSR_SPND(S)      !!(((S)->csr[5])&0x0001)
+#define CSR_LTINTEN(S)   !!(((S)->csr[5])&0x4000)
+#define CSR_TOKINTD(S)   !!(((S)->csr[5])&0x8000)
+#define CSR_DRX(S)       !!(((S)->csr[15])&0x0001)
+#define CSR_DTX(S)       !!(((S)->csr[15])&0x0002)
+#define CSR_LOOP(S)      !!(((S)->csr[15])&0x0004)
+#define CSR_DRCVPA(S)    !!(((S)->csr[15])&0x2000)
+#define CSR_DRCVBC(S)    !!(((S)->csr[15])&0x4000)
+#define CSR_PROM(S)      !!(((S)->csr[15])&0x8000)
+
+#define CSR_CRBC(S)      ((S)->csr[40])
+#define CSR_CRST(S)      ((S)->csr[41])
+#define CSR_CXBC(S)      ((S)->csr[42])
+#define CSR_CXST(S)      ((S)->csr[43])
+#define CSR_NRBC(S)      ((S)->csr[44])
+#define CSR_NRST(S)      ((S)->csr[45])
+#define CSR_POLL(S)      ((S)->csr[46])
+#define CSR_PINT(S)      ((S)->csr[47])
+#define CSR_RCVRC(S)     ((S)->csr[72])
+#define CSR_XMTRC(S)     ((S)->csr[74])
+#define CSR_RCVRL(S)     ((S)->csr[76])
+#define CSR_XMTRL(S)     ((S)->csr[78])
+#define CSR_MISSC(S)     ((S)->csr[112])
+
+#define CSR_IADR(S)      ((S)->csr[ 1] | ((S)->csr[ 2] << 16))
+#define CSR_CRBA(S)      ((S)->csr[18] | ((S)->csr[19] << 16))
+#define CSR_CXBA(S)      ((S)->csr[20] | ((S)->csr[21] << 16))
+#define CSR_NRBA(S)      ((S)->csr[22] | ((S)->csr[23] << 16))
+#define CSR_BADR(S)      ((S)->csr[24] | ((S)->csr[25] << 16))
+#define CSR_NRDA(S)      ((S)->csr[26] | ((S)->csr[27] << 16))
+#define CSR_CRDA(S)      ((S)->csr[28] | ((S)->csr[29] << 16))
+#define CSR_BADX(S)      ((S)->csr[30] | ((S)->csr[31] << 16))
+#define CSR_NXDA(S)      ((S)->csr[32] | ((S)->csr[33] << 16))
+#define CSR_CXDA(S)      ((S)->csr[34] | ((S)->csr[35] << 16))
+#define CSR_NNRD(S)      ((S)->csr[36] | ((S)->csr[37] << 16))
+#define CSR_NNXD(S)      ((S)->csr[38] | ((S)->csr[39] << 16))
+#define CSR_PXDA(S)      ((S)->csr[60] | ((S)->csr[61] << 16))
+#define CSR_NXBA(S)      ((S)->csr[64] | ((S)->csr[65] << 16))
+
+#define PHYSADDR(S,A) \
+  (BCR_SSIZE32(S) ? (A) : (A) | ((0xff00 & (uint32_t)(s)->csr[2])<<16))
+
+struct pcnet_initblk16 {
+    uint16_t mode;
+    uint16_t padr1;
+    uint16_t padr2;
+    uint16_t padr3;
+    uint16_t ladrf1;
+    uint16_t ladrf2;
+    uint16_t ladrf3;
+    uint16_t ladrf4;
+    unsigned PACKED(rdra:24);
+    unsigned PACKED(res1:5);
+    unsigned PACKED(rlen:3);
+    unsigned PACKED(tdra:24);
+    unsigned PACKED(res2:5);
+    unsigned PACKED(tlen:3);
+};
+
+struct pcnet_initblk32 {
+    uint16_t mode;
+    unsigned PACKED(res1:4);
+    unsigned PACKED(rlen:4);
+    unsigned PACKED(res2:4);
+    unsigned PACKED(tlen:4);
+    uint16_t padr1;
+    uint16_t padr2;
+    uint16_t padr3;
+    uint16_t _res;
+    uint16_t ladrf1;
+    uint16_t ladrf2;
+    uint16_t ladrf3;
+    uint16_t ladrf4;
+    uint32_t rdra;
+    uint32_t tdra;
+};
+
+struct pcnet_TMD {
+    struct {
+        unsigned tbadr:32;
+    } tmd0;
+    struct {
+        unsigned PACKED(bcnt:12), PACKED(ones:4), PACKED(res:7), PACKED(bpe:1);
+        unsigned PACKED(enp:1), PACKED(stp:1), PACKED(def:1), PACKED(one:1);
+        unsigned PACKED(ltint:1), PACKED(nofcs:1), PACKED(err:1), PACKED(own:1);
+    } tmd1;
+    struct {
+        unsigned PACKED(trc:4), PACKED(res:12);
+        unsigned PACKED(tdr:10), PACKED(rtry:1), PACKED(lcar:1);
+        unsigned PACKED(lcol:1), PACKED(exdef:1), PACKED(uflo:1), PACKED(buff:1);
+    } tmd2;
+    struct {
+        unsigned res:32;
+    } tmd3;    
+};
+
+struct pcnet_RMD {
+    struct {
+        unsigned rbadr:32;
+    } rmd0;
+    struct {
+        unsigned PACKED(bcnt:12), PACKED(ones:4), PACKED(res:4);
+        unsigned PACKED(bam:1), PACKED(lafm:1), PACKED(pam:1), PACKED(bpe:1);
+        unsigned PACKED(enp:1), PACKED(stp:1), PACKED(buff:1), PACKED(crc:1);
+        unsigned PACKED(oflo:1), PACKED(fram:1), PACKED(err:1), PACKED(own:1);
+    } rmd1;
+    struct {
+        unsigned PACKED(mcnt:12), PACKED(zeros:4);
+        unsigned PACKED(rpc:8), PACKED(rcc:8);
+    } rmd2;    
+    struct {
+        unsigned res:32;
+    } rmd3;    
+};
+
+
+#define PRINT_TMD(T) printf(    \
+        "TMD0 : TBADR=0x%08x\n" \
+        "TMD1 : OWN=%d, ERR=%d, FCS=%d, LTI=%d, "       \
+        "ONE=%d, DEF=%d, STP=%d, ENP=%d,\n"             \
+        "       BPE=%d, BCNT=%d\n"                      \
+        "TMD2 : BUF=%d, UFL=%d, EXD=%d, LCO=%d, "       \
+        "LCA=%d, RTR=%d,\n"                             \
+        "       TDR=%d, TRC=%d\n",                      \
+        (T)->tmd0.tbadr,                                \
+        (T)->tmd1.own, (T)->tmd1.err, (T)->tmd1.nofcs,  \
+        (T)->tmd1.ltint, (T)->tmd1.one, (T)->tmd1.def,  \
+        (T)->tmd1.stp, (T)->tmd1.enp, (T)->tmd1.bpe,    \
+        4096-(T)->tmd1.bcnt,                            \
+        (T)->tmd2.buff, (T)->tmd2.uflo, (T)->tmd2.exdef,\
+        (T)->tmd2.lcol, (T)->tmd2.lcar, (T)->tmd2.rtry, \
+        (T)->tmd2.tdr, (T)->tmd2.trc)
+
+#define PRINT_RMD(R) printf(    \
+        "RMD0 : RBADR=0x%08x\n" \
+        "RMD1 : OWN=%d, ERR=%d, FRAM=%d, OFLO=%d, "     \
+        "CRC=%d, BUFF=%d, STP=%d, ENP=%d,\n       "     \
+        "BPE=%d, PAM=%d, LAFM=%d, BAM=%d, ONES=%d, BCNT=%d\n"    \
+        "RMD2 : RCC=%d, RPC=%d, MCNT=%d, ZEROS=%d\n",   \
+        (R)->rmd0.rbadr,                                \
+        (R)->rmd1.own, (R)->rmd1.err, (R)->rmd1.fram,   \
+        (R)->rmd1.oflo, (R)->rmd1.crc, (R)->rmd1.buff,  \
+        (R)->rmd1.stp, (R)->rmd1.enp, (R)->rmd1.bpe,    \
+        (R)->rmd1.pam, (R)->rmd1.lafm, (R)->rmd1.bam,   \
+        (R)->rmd1.ones, 4096-(R)->rmd1.bcnt,            \
+        (R)->rmd2.rcc, (R)->rmd2.rpc, (R)->rmd2.mcnt,   \
+        (R)->rmd2.zeros)
+
+static inline void pcnet_tmd_load(PCNetState *s, struct pcnet_TMD *tmd, target_phys_addr_t addr)
+{
+    if (!BCR_SWSTYLE(s)) {
+        uint16_t xda[4];
+        cpu_physical_memory_read(addr,
+                (void *)&xda[0], sizeof(xda));
+        ((uint32_t *)tmd)[0] = (xda[0]&0xffff) |
+                ((xda[1]&0x00ff) << 16);
+        ((uint32_t *)tmd)[1] = (xda[2]&0xffff)|
+                ((xda[1] & 0xff00) << 16);
+        ((uint32_t *)tmd)[2] =
+                (xda[3] & 0xffff) << 16;
+        ((uint32_t *)tmd)[3] = 0;
+    }
+    else
+    if (BCR_SWSTYLE(s) != 3)
+        cpu_physical_memory_read(addr, (void *)tmd, 16);
+    else {
+        uint32_t xda[4];
+        cpu_physical_memory_read(addr,
+                (void *)&xda[0], sizeof(xda));
+        ((uint32_t *)tmd)[0] = xda[2];
+        ((uint32_t *)tmd)[1] = xda[1];
+        ((uint32_t *)tmd)[2] = xda[0];
+        ((uint32_t *)tmd)[3] = xda[3];
+    }
+}
+
+static inline void pcnet_tmd_store(PCNetState *s, struct pcnet_TMD *tmd, target_phys_addr_t addr)
+{
+    if (!BCR_SWSTYLE(s)) {
+        uint16_t xda[4];
+        xda[0] = ((uint32_t *)tmd)[0] & 0xffff;
+        xda[1] = ((((uint32_t *)tmd)[0]>>16)&0x00ff) |
+            ((((uint32_t *)tmd)[1]>>16)&0xff00);
+        xda[2] = ((uint32_t *)tmd)[1] & 0xffff;
+        xda[3] = ((uint32_t *)tmd)[2] >> 16;
+        cpu_physical_memory_write(addr,
+                (void *)&xda[0], sizeof(xda));
+    }
+    else {
+        if (BCR_SWSTYLE(s) != 3)
+            cpu_physical_memory_write(addr, (void *)tmd, 16);
+        else {
+            uint32_t xda[4];
+            xda[0] = ((uint32_t *)tmd)[2];
+            xda[1] = ((uint32_t *)tmd)[1];
+            xda[2] = ((uint32_t *)tmd)[0];
+            xda[3] = ((uint32_t *)tmd)[3];
+            cpu_physical_memory_write(addr,
+                    (void *)&xda[0], sizeof(xda));
+        }
+    }
+}
+
+static inline void pcnet_rmd_load(PCNetState *s, struct pcnet_RMD *rmd, target_phys_addr_t addr)
+{
+    if (!BCR_SWSTYLE(s)) {
+        uint16_t rda[4];
+        cpu_physical_memory_read(addr,
+                (void *)&rda[0], sizeof(rda));
+        ((uint32_t *)rmd)[0] = (rda[0]&0xffff)|
+                ((rda[1] & 0x00ff) << 16);
+        ((uint32_t *)rmd)[1] = (rda[2]&0xffff)|
+                ((rda[1] & 0xff00) << 16);
+        ((uint32_t *)rmd)[2] = rda[3] & 0xffff;
+        ((uint32_t *)rmd)[3] = 0;
+    }
+    else
+    if (BCR_SWSTYLE(s) != 3)
+        cpu_physical_memory_read(addr, (void *)rmd, 16);
+    else {
+        uint32_t rda[4];
+        cpu_physical_memory_read(addr,
+                (void *)&rda[0], sizeof(rda));
+        ((uint32_t *)rmd)[0] = rda[2];
+        ((uint32_t *)rmd)[1] = rda[1];
+        ((uint32_t *)rmd)[2] = rda[0];
+        ((uint32_t *)rmd)[3] = rda[3];
+    }
+}
+
+static inline void pcnet_rmd_store(PCNetState *s, struct pcnet_RMD *rmd, target_phys_addr_t addr)
+{
+    if (!BCR_SWSTYLE(s)) {
+        uint16_t rda[4];                        \
+        rda[0] = ((uint32_t *)rmd)[0] & 0xffff; \
+        rda[1] = ((((uint32_t *)rmd)[0]>>16)&0xff)|\
+            ((((uint32_t *)rmd)[1]>>16)&0xff00);\
+        rda[2] = ((uint32_t *)rmd)[1] & 0xffff; \
+        rda[3] = ((uint32_t *)rmd)[2] & 0xffff; \
+        cpu_physical_memory_write(addr,         \
+                (void *)&rda[0], sizeof(rda));  \
+    }
+    else {
+        if (BCR_SWSTYLE(s) != 3)
+            cpu_physical_memory_write(addr, (void *)rmd, 16);
+        else {
+            uint32_t rda[4];
+            rda[0] = ((uint32_t *)rmd)[2];
+            rda[1] = ((uint32_t *)rmd)[1];
+            rda[2] = ((uint32_t *)rmd)[0];
+            rda[3] = ((uint32_t *)rmd)[3];
+            cpu_physical_memory_write(addr,
+                    (void *)&rda[0], sizeof(rda));
+        }
+    }
+}
+
+
+#define TMDLOAD(TMD,ADDR) pcnet_tmd_load(s,TMD,ADDR)
+
+#define TMDSTORE(TMD,ADDR) pcnet_tmd_store(s,TMD,ADDR)
+
+#define RMDLOAD(RMD,ADDR) pcnet_rmd_load(s,RMD,ADDR)
+
+#define RMDSTORE(RMD,ADDR) pcnet_rmd_store(s,RMD,ADDR)
+
+#if 1
+
+#define CHECK_RMD(ADDR,RES) do {                \
+    struct pcnet_RMD rmd;                       \
+    RMDLOAD(&rmd,(ADDR));                       \
+    (RES) |= (rmd.rmd1.ones != 15)              \
+          || (rmd.rmd2.zeros != 0);             \
+} while (0)
+
+#define CHECK_TMD(ADDR,RES) do {                \
+    struct pcnet_TMD tmd;                       \
+    TMDLOAD(&tmd,(ADDR));                       \
+    (RES) |= (tmd.tmd1.ones != 15);             \
+} while (0)
+
+#else
+
+#define CHECK_RMD(ADDR,RES) do {                \
+    switch (BCR_SWSTYLE(s)) {                   \
+    case 0x00:                                  \
+        do {                                    \
+            uint16_t rda[4];                    \
+            cpu_physical_memory_read((ADDR),    \
+                (void *)&rda[0], sizeof(rda));  \
+            (RES) |= (rda[2] & 0xf000)!=0xf000; \
+            (RES) |= (rda[3] & 0xf000)!=0x0000; \
+        } while (0);                            \
+        break;                                  \
+    case 0x01:                                  \
+    case 0x02:                                  \
+        do {                                    \
+            uint32_t rda[4];                    \
+            cpu_physical_memory_read((ADDR),    \
+                (void *)&rda[0], sizeof(rda)); \
+            (RES) |= (rda[1] & 0x0000f000L)!=0x0000f000L; \
+            (RES) |= (rda[2] & 0x0000f000L)!=0x00000000L; \
+        } while (0);                            \
+        break;                                  \
+    case 0x03:                                  \
+        do {                                    \
+            uint32_t rda[4];                    \
+            cpu_physical_memory_read((ADDR),    \
+                (void *)&rda[0], sizeof(rda)); \
+            (RES) |= (rda[0] & 0x0000f000L)!=0x00000000L; \
+            (RES) |= (rda[1] & 0x0000f000L)!=0x0000f000L; \
+        } while (0);                            \
+        break;                                  \
+    }                                           \
+} while (0)
+
+#define CHECK_TMD(ADDR,RES) do {                \
+    switch (BCR_SWSTYLE(s)) {                   \
+    case 0x00:                                  \
+        do {                                    \
+            uint16_t xda[4];                    \
+            cpu_physical_memory_read((ADDR),    \
+                (void *)&xda[0], sizeof(xda));  \
+            (RES) |= (xda[2] & 0xf000)!=0xf000;\
+        } while (0);                            \
+        break;                                  \
+    case 0x01:                                  \
+    case 0x02:                                  \
+    case 0x03:                                  \
+        do {                                    \
+            uint32_t xda[4];                    \
+            cpu_physical_memory_read((ADDR),    \
+                (void *)&xda[0], sizeof(xda));  \
+            (RES) |= (xda[1] & 0x0000f000L)!=0x0000f000L; \
+        } while (0);                            \
+        break;                                  \
+    }                                           \
+} while (0)
+
+#endif
+
+#define PRINT_PKTHDR(BUF) do {                  \
+    struct ether_header *hdr = (void *)(BUF);   \
+    printf("packet dhost=%02x:%02x:%02x:%02x:%02x:%02x, "       \
+           "shost=%02x:%02x:%02x:%02x:%02x:%02x, "              \
+           "type=0x%04x (bcast=%d)\n",                          \
+           hdr->ether_dhost[0],hdr->ether_dhost[1],hdr->ether_dhost[2], \
+           hdr->ether_dhost[3],hdr->ether_dhost[4],hdr->ether_dhost[5], \
+           hdr->ether_shost[0],hdr->ether_shost[1],hdr->ether_shost[2], \
+           hdr->ether_shost[3],hdr->ether_shost[4],hdr->ether_shost[5], \
+           htons(hdr->ether_type),                                      \
+           !!ETHER_IS_MULTICAST(hdr->ether_dhost));                     \
+} while (0)
+
+#define MULTICAST_FILTER_LEN 8
+
+static inline uint32_t lnc_mchash(const uint8_t *ether_addr)
+{
+#define LNC_POLYNOMIAL          0xEDB88320UL
+    uint32_t crc = 0xFFFFFFFF;
+    int idx, bit;
+    uint8_t data;
+
+    for (idx = 0; idx < ETHER_ADDR_LEN; idx++) {
+        for (data = *ether_addr++, bit = 0; bit < MULTICAST_FILTER_LEN; bit++) {
+            crc = (crc >> 1) ^ (((crc ^ data) & 1) ? LNC_POLYNOMIAL : 0);
+            data >>= 1;
+        }
+    }
+    return crc;
+#undef LNC_POLYNOMIAL
+}
+
+#define CRC(crc, ch)	 (crc = (crc >> 8) ^ crctab[(crc ^ (ch)) & 0xff])
+
+/* generated using the AUTODIN II polynomial
+ *	x^32 + x^26 + x^23 + x^22 + x^16 +
+ *	x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1
+ */
+static const uint32_t crctab[256] = {
+	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
+	0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+	0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
+	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
+	0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
+	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
+	0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+	0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+	0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
+	0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
+	0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+	0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
+	0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
+	0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+	0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+	0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
+	0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
+	0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+	0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
+	0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
+	0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
+	0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+	0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
+	0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
+	0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
+	0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
+	0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
+	0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
+	0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
+	0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
+	0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
+	0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
+	0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
+	0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
+	0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
+	0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
+	0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
+};
+
+static inline int padr_match(PCNetState *s, const uint8_t *buf, int size)
+{
+    struct ether_header *hdr = (void *)buf;
+    uint8_t padr[6] = { 
+        s->csr[12] & 0xff, s->csr[12] >> 8,
+        s->csr[13] & 0xff, s->csr[13] >> 8,
+        s->csr[14] & 0xff, s->csr[14] >> 8 
+    };
+    int result = (!CSR_DRCVPA(s)) && !bcmp(hdr->ether_dhost, padr, 6);
+#ifdef PCNET_DEBUG_MATCH
+    printf("packet dhost=%02x:%02x:%02x:%02x:%02x:%02x, "
+           "padr=%02x:%02x:%02x:%02x:%02x:%02x\n",
+           hdr->ether_dhost[0],hdr->ether_dhost[1],hdr->ether_dhost[2],
+           hdr->ether_dhost[3],hdr->ether_dhost[4],hdr->ether_dhost[5],
+           padr[0],padr[1],padr[2],padr[3],padr[4],padr[5]);
+    printf("padr_match result=%d\n", result);
+#endif
+    return result;
+}
+
+static inline int padr_bcast(PCNetState *s, const uint8_t *buf, int size)
+{
+    static uint8_t BCAST[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+    struct ether_header *hdr = (void *)buf;
+    int result = !CSR_DRCVBC(s) && !bcmp(hdr->ether_dhost, BCAST, 6);
+#ifdef PCNET_DEBUG_MATCH
+    printf("padr_bcast result=%d\n", result);
+#endif
+    return result;
+}
+
+static inline int ladr_match(PCNetState *s, const uint8_t *buf, int size)
+{
+    struct ether_header *hdr = (void *)buf;
+    if ((*(hdr->ether_dhost)&0x01) && 
+        ((uint64_t *)&s->csr[8])[0] != 0LL) {
+        uint8_t ladr[8] = { 
+            s->csr[8] & 0xff, s->csr[8] >> 8,
+            s->csr[9] & 0xff, s->csr[9] >> 8,
+            s->csr[10] & 0xff, s->csr[10] >> 8, 
+            s->csr[11] & 0xff, s->csr[11] >> 8 
+        };
+        int index = lnc_mchash(hdr->ether_dhost) >> 26;
+        return !!(ladr[index >> 3] & (1 << (index & 7)));
+    }
+    return 0;
+}
+
+static inline target_phys_addr_t pcnet_rdra_addr(PCNetState *s, int idx) 
+{
+    while (idx < 1) idx += CSR_RCVRL(s);
+    return s->rdra + ((CSR_RCVRL(s) - idx) * (BCR_SWSTYLE(s) ? 16 : 8));
+}
+
+static inline int64_t pcnet_get_next_poll_time(PCNetState *s, int64_t current_time)
+{
+    int64_t next_time = current_time + 
+        muldiv64(65536 - (CSR_SPND(s) ? 0 : CSR_POLL(s)), 
+                 ticks_per_sec, 33000000L);
+    if (next_time <= current_time)
+        next_time = current_time + 1;
+    return next_time;
+}
+
+static void pcnet_poll(PCNetState *s);
+static void pcnet_poll_timer(void *opaque);
+
+static uint32_t pcnet_csr_readw(PCNetState *s, uint32_t rap);
+static void pcnet_csr_writew(PCNetState *s, uint32_t rap, uint32_t new_value);
+static void pcnet_bcr_writew(PCNetState *s, uint32_t rap, uint32_t val);
+static uint32_t pcnet_bcr_readw(PCNetState *s, uint32_t rap);
+
+static void pcnet_s_reset(PCNetState *s)
+{
+#ifdef PCNET_DEBUG
+    printf("pcnet_s_reset\n");
+#endif
+
+    s->lnkst = 0x40;
+    s->rdra = 0;
+    s->tdra = 0;
+    s->rap = 0;
+    
+    s->bcr[BCR_BSBC] &= ~0x0080;
+
+    s->csr[0]   = 0x0004;
+    s->csr[3]   = 0x0000;
+    s->csr[4]   = 0x0115;
+    s->csr[5]   = 0x0000;
+    s->csr[6]   = 0x0000;
+    s->csr[8]   = 0;
+    s->csr[9]   = 0;
+    s->csr[10]  = 0;
+    s->csr[11]  = 0;
+    s->csr[12]  = le16_to_cpu(((uint16_t *)&s->prom[0])[0]);
+    s->csr[13]  = le16_to_cpu(((uint16_t *)&s->prom[0])[1]);
+    s->csr[14]  = le16_to_cpu(((uint16_t *)&s->prom[0])[2]);
+    s->csr[15] &= 0x21c4;
+    s->csr[72]  = 1;
+    s->csr[74]  = 1;
+    s->csr[76]  = 1;
+    s->csr[78]  = 1;
+    s->csr[80]  = 0x1410;
+    s->csr[88]  = 0x1003;
+    s->csr[89]  = 0x0262;
+    s->csr[94]  = 0x0000;
+    s->csr[100] = 0x0200;
+    s->csr[103] = 0x0105;
+    s->csr[103] = 0x0105;
+    s->csr[112] = 0x0000;
+    s->csr[114] = 0x0000;
+    s->csr[122] = 0x0000;
+    s->csr[124] = 0x0000;
+}
+
+static void pcnet_update_irq(PCNetState *s)
+{
+    int isr = 0;
+    s->csr[0] &= ~0x0080;
+    
+#if 1
+    if (((s->csr[0] & ~s->csr[3]) & 0x5f00) ||
+        (((s->csr[4]>>1) & ~s->csr[4]) & 0x0115) ||
+        (((s->csr[5]>>1) & s->csr[5]) & 0x0048))
+#else
+    if ((!(s->csr[3] & 0x4000) && !!(s->csr[0] & 0x4000)) /* BABL */ ||
+        (!(s->csr[3] & 0x1000) && !!(s->csr[0] & 0x1000)) /* MISS */ ||
+        (!(s->csr[3] & 0x0100) && !!(s->csr[0] & 0x0100)) /* IDON */ ||
+        (!(s->csr[3] & 0x0200) && !!(s->csr[0] & 0x0200)) /* TINT */ ||
+        (!(s->csr[3] & 0x0400) && !!(s->csr[0] & 0x0400)) /* RINT */ ||
+        (!(s->csr[3] & 0x0800) && !!(s->csr[0] & 0x0800)) /* MERR */ ||
+        (!(s->csr[4] & 0x0001) && !!(s->csr[4] & 0x0002)) /* JAB */ ||
+        (!(s->csr[4] & 0x0004) && !!(s->csr[4] & 0x0008)) /* TXSTRT */ ||
+        (!(s->csr[4] & 0x0010) && !!(s->csr[4] & 0x0020)) /* RCVO */ ||
+        (!(s->csr[4] & 0x0100) && !!(s->csr[4] & 0x0200)) /* MFCO */ ||
+        (!!(s->csr[5] & 0x0040) && !!(s->csr[5] & 0x0080)) /* EXDINT */ ||
+        (!!(s->csr[5] & 0x0008) && !!(s->csr[5] & 0x0010)) /* MPINT */)
+#endif
+    {
+       
+        isr = CSR_INEA(s);
+        s->csr[0] |= 0x0080;
+    }
+    
+    if (!!(s->csr[4] & 0x0080) && CSR_INEA(s)) { /* UINT */
+        s->csr[4] &= ~0x0080;
+        s->csr[4] |= 0x0040;
+        s->csr[0] |= 0x0080;
+        isr = 1;
+#ifdef PCNET_DEBUG
+        printf("pcnet user int\n");
+#endif
+    }
+
+#if 1
+    if (((s->csr[5]>>1) & s->csr[5]) & 0x0500) 
+#else
+    if ((!!(s->csr[5] & 0x0400) && !!(s->csr[5] & 0x0800)) /* SINT */ ||
+        (!!(s->csr[5] & 0x0100) && !!(s->csr[5] & 0x0200)) /* SLPINT */ )
+#endif
+    {
+        isr = 1;
+        s->csr[0] |= 0x0080;
+    }
+
+    if (isr != s->isr) {
+#ifdef PCNET_DEBUG
+        printf("pcnet: INTA=%d\n", isr);
+#endif
+    }
+        pci_set_irq(&s->dev, 0, isr);
+        s->isr = isr;
+}
+
+static void pcnet_init(PCNetState *s)
+{
+#ifdef PCNET_DEBUG
+    printf("pcnet_init init_addr=0x%08x\n", PHYSADDR(s,CSR_IADR(s)));
+#endif
+    
+#define PCNET_INIT() do { \
+        cpu_physical_memory_read(PHYSADDR(s,CSR_IADR(s)),       \
+                (uint8_t *)&initblk, sizeof(initblk));          \
+        s->csr[15] = le16_to_cpu(initblk.mode);                 \
+        CSR_RCVRL(s) = (initblk.rlen < 9) ? (1 << initblk.rlen) : 512;  \
+        CSR_XMTRL(s) = (initblk.tlen < 9) ? (1 << initblk.tlen) : 512;  \
+        s->csr[ 6] = (initblk.tlen << 12) | (initblk.rlen << 8);        \
+        s->csr[ 8] = le16_to_cpu(initblk.ladrf1);                       \
+        s->csr[ 9] = le16_to_cpu(initblk.ladrf2);                       \
+        s->csr[10] = le16_to_cpu(initblk.ladrf3);                       \
+        s->csr[11] = le16_to_cpu(initblk.ladrf4);                       \
+        s->csr[12] = le16_to_cpu(initblk.padr1);                        \
+        s->csr[13] = le16_to_cpu(initblk.padr2);                        \
+        s->csr[14] = le16_to_cpu(initblk.padr3);                        \
+        s->rdra = PHYSADDR(s,initblk.rdra);                             \
+        s->tdra = PHYSADDR(s,initblk.tdra);                             \
+} while (0)
+    
+    if (BCR_SSIZE32(s)) {
+        struct pcnet_initblk32 initblk;
+        PCNET_INIT();
+#ifdef PCNET_DEBUG
+        printf("initblk.rlen=0x%02x, initblk.tlen=0x%02x\n",
+                initblk.rlen, initblk.tlen);
+#endif
+    } else {
+        struct pcnet_initblk16 initblk;
+        PCNET_INIT();
+#ifdef PCNET_DEBUG
+        printf("initblk.rlen=0x%02x, initblk.tlen=0x%02x\n",
+                initblk.rlen, initblk.tlen);
+#endif
+    }
+
+#undef PCNET_INIT
+
+    CSR_RCVRC(s) = CSR_RCVRL(s);
+    CSR_XMTRC(s) = CSR_XMTRL(s);
+
+#ifdef PCNET_DEBUG
+    printf("pcnet ss32=%d rdra=0x%08x[%d] tdra=0x%08x[%d]\n", 
+        BCR_SSIZE32(s),
+        s->rdra, CSR_RCVRL(s), s->tdra, CSR_XMTRL(s));
+#endif
+
+    s->csr[0] |= 0x0101;    
+    s->csr[0] &= ~0x0004;       /* clear STOP bit */
+}
+
+static void pcnet_start(PCNetState *s)
+{
+#ifdef PCNET_DEBUG
+    printf("pcnet_start\n");
+#endif
+
+    if (!CSR_DTX(s))
+        s->csr[0] |= 0x0010;    /* set TXON */
+        
+    if (!CSR_DRX(s))
+        s->csr[0] |= 0x0020;    /* set RXON */
+
+    s->csr[0] &= ~0x0004;       /* clear STOP bit */
+    s->csr[0] |= 0x0002;
+}
+
+static void pcnet_stop(PCNetState *s)
+{
+#ifdef PCNET_DEBUG
+    printf("pcnet_stop\n");
+#endif
+    s->csr[0] &= ~0x7feb;
+    s->csr[0] |= 0x0014;
+    s->csr[4] &= ~0x02c2;
+    s->csr[5] &= ~0x0011;
+    pcnet_poll_timer(s);
+}
+
+static void pcnet_rdte_poll(PCNetState *s)
+{
+    s->csr[28] = s->csr[29] = 0;
+    if (s->rdra) {
+        int bad = 0;
+#if 1
+        target_phys_addr_t crda = pcnet_rdra_addr(s, CSR_RCVRC(s));
+        target_phys_addr_t nrda = pcnet_rdra_addr(s, -1 + CSR_RCVRC(s));
+        target_phys_addr_t nnrd = pcnet_rdra_addr(s, -2 + CSR_RCVRC(s));
+#else
+        target_phys_addr_t crda = s->rdra + 
+            (CSR_RCVRL(s) - CSR_RCVRC(s)) *
+            (BCR_SWSTYLE(s) ? 16 : 8 );
+        int nrdc = CSR_RCVRC(s)<=1 ? CSR_RCVRL(s) : CSR_RCVRC(s)-1;
+        target_phys_addr_t nrda = s->rdra + 
+            (CSR_RCVRL(s) - nrdc) *
+            (BCR_SWSTYLE(s) ? 16 : 8 );
+        int nnrc = nrdc<=1 ? CSR_RCVRL(s) : nrdc-1;
+        target_phys_addr_t nnrd = s->rdra + 
+            (CSR_RCVRL(s) - nnrc) *
+            (BCR_SWSTYLE(s) ? 16 : 8 );
+#endif
+
+        CHECK_RMD(PHYSADDR(s,crda), bad);
+        if (!bad) {
+            CHECK_RMD(PHYSADDR(s,nrda), bad);
+            if (bad || (nrda == crda)) nrda = 0;
+            CHECK_RMD(PHYSADDR(s,nnrd), bad);
+            if (bad || (nnrd == crda)) nnrd = 0;
+
+            s->csr[28] = crda & 0xffff;
+            s->csr[29] = crda >> 16;
+            s->csr[26] = nrda & 0xffff;
+            s->csr[27] = nrda >> 16;
+            s->csr[36] = nnrd & 0xffff;
+            s->csr[37] = nnrd >> 16;
+#ifdef PCNET_DEBUG
+            if (bad) {
+                printf("pcnet: BAD RMD RECORDS AFTER 0x%08x\n",
+                       PHYSADDR(s,crda));
+            }
+        } else {
+            printf("pcnet: BAD RMD RDA=0x%08x\n", PHYSADDR(s,crda));
+#endif
+        }
+    }
+    
+    if (CSR_CRDA(s)) {
+        struct pcnet_RMD rmd;
+        RMDLOAD(&rmd, PHYSADDR(s,CSR_CRDA(s)));
+        CSR_CRBC(s) = rmd.rmd1.bcnt;
+        CSR_CRST(s) = ((uint32_t *)&rmd)[1] >> 16;
+#ifdef PCNET_DEBUG_RMD_X
+        printf("CRDA=0x%08x CRST=0x%04x RCVRC=%d RMD1=0x%08x RMD2=0x%08x\n",
+                PHYSADDR(s,CSR_CRDA(s)), CSR_CRST(s), CSR_RCVRC(s),
+                ((uint32_t *)&rmd)[1], ((uint32_t *)&rmd)[2]);
+        PRINT_RMD(&rmd);
+#endif
+    } else {
+        CSR_CRBC(s) = CSR_CRST(s) = 0;
+    }
+    
+    if (CSR_NRDA(s)) {
+        struct pcnet_RMD rmd;
+        RMDLOAD(&rmd, PHYSADDR(s,CSR_NRDA(s)));
+        CSR_NRBC(s) = rmd.rmd1.bcnt;
+        CSR_NRST(s) = ((uint32_t *)&rmd)[1] >> 16;
+    } else {
+        CSR_NRBC(s) = CSR_NRST(s) = 0;
+    }
+
+}
+
+static int pcnet_tdte_poll(PCNetState *s)
+{
+    s->csr[34] = s->csr[35] = 0;
+    if (s->tdra) {
+        target_phys_addr_t cxda = s->tdra + 
+            (CSR_XMTRL(s) - CSR_XMTRC(s)) *
+            (BCR_SWSTYLE(s) ? 16 : 8 );
+        int bad = 0;
+        CHECK_TMD(PHYSADDR(s, cxda),bad);
+        if (!bad) {
+            if (CSR_CXDA(s) != cxda) {
+                s->csr[60] = s->csr[34];
+                s->csr[61] = s->csr[35];
+                s->csr[62] = CSR_CXBC(s);
+                s->csr[63] = CSR_CXST(s);
+            }
+            s->csr[34] = cxda & 0xffff;
+            s->csr[35] = cxda >> 16;
+#ifdef PCNET_DEBUG
+        } else {
+            printf("pcnet: BAD TMD XDA=0x%08x\n", PHYSADDR(s,cxda));
+#endif
+        }
+    }
+
+    if (CSR_CXDA(s)) {
+        struct pcnet_TMD tmd;
+
+        TMDLOAD(&tmd, PHYSADDR(s,CSR_CXDA(s)));                
+
+        CSR_CXBC(s) = tmd.tmd1.bcnt;
+        CSR_CXST(s) = ((uint32_t *)&tmd)[1] >> 16;
+    } else {
+        CSR_CXBC(s) = CSR_CXST(s) = 0;
+    }
+    
+    return !!(CSR_CXST(s) & 0x8000);
+}
+
+static int pcnet_can_receive(void *opaque)
+{
+    PCNetState *s = opaque;
+    if (CSR_STOP(s) || CSR_SPND(s))
+        return 0;
+        
+    if (s->recv_pos > 0)
+        return 0;
+
+    return sizeof(s->buffer)-16;
+}
+
+#define MIN_BUF_SIZE 60
+
+static void pcnet_receive(void *opaque, const uint8_t *buf, int size)
+{
+    PCNetState *s = opaque;
+    int is_padr = 0, is_bcast = 0, is_ladr = 0;
+    uint8_t buf1[60];
+
+    if (CSR_DRX(s) || CSR_STOP(s) || CSR_SPND(s) || !size)
+        return;
+
+#ifdef PCNET_DEBUG
+    printf("pcnet_receive size=%d\n", size);
+#endif
+
+    /* if too small buffer, then expand it */
+    if (size < MIN_BUF_SIZE) {
+        memcpy(buf1, buf, size);
+        memset(buf1 + size, 0, MIN_BUF_SIZE - size);
+        buf = buf1;
+        size = MIN_BUF_SIZE;
+    }
+
+    if (CSR_PROM(s) 
+        || (is_padr=padr_match(s, buf, size)) 
+        || (is_bcast=padr_bcast(s, buf, size))
+        || (is_ladr=ladr_match(s, buf, size))) {
+
+        pcnet_rdte_poll(s);
+
+        if (!(CSR_CRST(s) & 0x8000) && s->rdra) {
+            struct pcnet_RMD rmd;
+            int rcvrc = CSR_RCVRC(s)-1,i;
+            target_phys_addr_t nrda;
+            for (i = CSR_RCVRL(s)-1; i > 0; i--, rcvrc--) {
+                if (rcvrc <= 1)
+                    rcvrc = CSR_RCVRL(s);
+                nrda = s->rdra +
+                    (CSR_RCVRL(s) - rcvrc) *
+                    (BCR_SWSTYLE(s) ? 16 : 8 );
+                RMDLOAD(&rmd, PHYSADDR(s,nrda));                  
+                if (rmd.rmd1.own) {                
+#ifdef PCNET_DEBUG_RMD
+                    printf("pcnet - scan buffer: RCVRC=%d PREV_RCVRC=%d\n", 
+                                rcvrc, CSR_RCVRC(s));
+#endif
+                    CSR_RCVRC(s) = rcvrc;
+                    pcnet_rdte_poll(s);
+                    break;
+                }
+            }
+        }
+
+        if (!(CSR_CRST(s) & 0x8000)) {
+#ifdef PCNET_DEBUG_RMD
+            printf("pcnet - no buffer: RCVRC=%d\n", CSR_RCVRC(s));
+#endif
+            s->csr[0] |= 0x1000; /* Set MISS flag */
+            CSR_MISSC(s)++;
+        } else {
+            uint8_t *src = &s->buffer[8];
+            target_phys_addr_t crda = CSR_CRDA(s);
+            struct pcnet_RMD rmd;
+            int pktcount = 0;
+
+            memcpy(src, buf, size);
+            
+            /* XXX: avoid CRC generation */
+            if (!CSR_ASTRP_RCV(s)) {
+                uint32_t fcs = ~0;
+#if 0            
+                uint8_t *p = s->buffer;
+                
+                ((uint32_t *)p)[0] = ((uint32_t *)p)[1] = 0xaaaaaaaa;
+                p[7] = 0xab;
+#else
+                uint8_t *p = src;
+#endif
+
+                while (size < 46) {
+                    src[size++] = 0;
+                }
+                
+                while (p != &src[size]) {
+                    CRC(fcs, *p++);
+                }
+                ((uint32_t *)&src[size])[0] = htonl(fcs);
+                size += 4; /* FCS at end of packet */
+            } else size += 4;
+
+#ifdef PCNET_DEBUG_MATCH
+            PRINT_PKTHDR(buf);
+#endif
+
+            RMDLOAD(&rmd, PHYSADDR(s,crda));
+            /*if (!CSR_LAPPEN(s))*/
+                rmd.rmd1.stp = 1;
+
+#define PCNET_RECV_STORE() do {                                 \
+    int count = MIN(4096 - rmd.rmd1.bcnt,size);                 \
+    target_phys_addr_t rbadr = PHYSADDR(s, rmd.rmd0.rbadr);     \
+    cpu_physical_memory_write(rbadr, src, count);               \
+    src += count; size -= count;                                \
+    rmd.rmd2.mcnt = count; rmd.rmd1.own = 0;                    \
+    RMDSTORE(&rmd, PHYSADDR(s,crda));                           \
+    pktcount++;                                                 \
+} while (0)
+
+            PCNET_RECV_STORE();
+            if ((size > 0) && CSR_NRDA(s)) {
+                target_phys_addr_t nrda = CSR_NRDA(s);
+                RMDLOAD(&rmd, PHYSADDR(s,nrda));
+                if (rmd.rmd1.own) {
+                    crda = nrda;
+                    PCNET_RECV_STORE();
+                    if ((size > 0) && (nrda=CSR_NNRD(s))) {
+                        RMDLOAD(&rmd, PHYSADDR(s,nrda));
+                        if (rmd.rmd1.own) {
+                            crda = nrda;
+                            PCNET_RECV_STORE();
+                        }
+                    }
+                }                
+            }
+
+#undef PCNET_RECV_STORE
+
+            RMDLOAD(&rmd, PHYSADDR(s,crda));
+            if (size == 0) {
+                rmd.rmd1.enp = 1;
+                rmd.rmd1.pam = !CSR_PROM(s) && is_padr;
+                rmd.rmd1.lafm = !CSR_PROM(s) && is_ladr;
+                rmd.rmd1.bam = !CSR_PROM(s) && is_bcast;
+            } else {
+                rmd.rmd1.oflo = 1;
+                rmd.rmd1.buff = 1;
+                rmd.rmd1.err = 1;
+            }
+            RMDSTORE(&rmd, PHYSADDR(s,crda));
+            s->csr[0] |= 0x0400;
+
+#ifdef PCNET_DEBUG
+            printf("RCVRC=%d CRDA=0x%08x BLKS=%d\n", 
+                CSR_RCVRC(s), PHYSADDR(s,CSR_CRDA(s)), pktcount);
+#endif
+#ifdef PCNET_DEBUG_RMD
+            PRINT_RMD(&rmd);
+#endif        
+
+            while (pktcount--) {
+                if (CSR_RCVRC(s) <= 1)
+                    CSR_RCVRC(s) = CSR_RCVRL(s);
+                else
+                    CSR_RCVRC(s)--;            
+            }
+            
+            pcnet_rdte_poll(s);
+
+        }        
+    }
+
+    pcnet_poll(s);
+    pcnet_update_irq(s);    
+}
+
+static void pcnet_transmit(PCNetState *s)
+{
+    target_phys_addr_t xmit_cxda = 0;
+    int count = CSR_XMTRL(s)-1;
+    s->xmit_pos = -1;
+    
+    if (!CSR_TXON(s)) {
+        s->csr[0] &= ~0x0008;
+        return;
+    }
+    
+    txagain:
+    if (pcnet_tdte_poll(s)) {
+        struct pcnet_TMD tmd;
+
+        TMDLOAD(&tmd, PHYSADDR(s,CSR_CXDA(s)));                
+
+#ifdef PCNET_DEBUG_TMD
+        printf("  TMDLOAD 0x%08x\n", PHYSADDR(s,CSR_CXDA(s)));
+        PRINT_TMD(&tmd);
+#endif
+        if (tmd.tmd1.stp) {
+            s->xmit_pos = 0;                
+            if (!tmd.tmd1.enp) {
+                cpu_physical_memory_read(PHYSADDR(s, tmd.tmd0.tbadr),
+                        s->buffer, 4096 - tmd.tmd1.bcnt);
+                s->xmit_pos += 4096 - tmd.tmd1.bcnt;
+            } 
+            xmit_cxda = PHYSADDR(s,CSR_CXDA(s));
+        }
+        if (tmd.tmd1.enp && (s->xmit_pos >= 0)) {
+            cpu_physical_memory_read(PHYSADDR(s, tmd.tmd0.tbadr),
+                    s->buffer + s->xmit_pos, 4096 - tmd.tmd1.bcnt);
+            s->xmit_pos += 4096 - tmd.tmd1.bcnt;
+#ifdef PCNET_DEBUG
+            printf("pcnet_transmit size=%d\n", s->xmit_pos);
+#endif            
+            if (CSR_LOOP(s))
+                pcnet_receive(s, s->buffer, s->xmit_pos);
+            else
+                qemu_send_packet(s->vc, s->buffer, s->xmit_pos);
+
+            s->csr[0] &= ~0x0008;   /* clear TDMD */
+            s->csr[4] |= 0x0004;    /* set TXSTRT */
+            s->xmit_pos = -1;
+        }
+
+        tmd.tmd1.own = 0;
+        TMDSTORE(&tmd, PHYSADDR(s,CSR_CXDA(s)));
+        if (!CSR_TOKINTD(s) || (CSR_LTINTEN(s) && tmd.tmd1.ltint))
+            s->csr[0] |= 0x0200;    /* set TINT */
+
+        if (CSR_XMTRC(s)<=1)
+            CSR_XMTRC(s) = CSR_XMTRL(s);
+        else
+            CSR_XMTRC(s)--;
+        if (count--)
+            goto txagain;
+
+    } else 
+    if (s->xmit_pos >= 0) {
+        struct pcnet_TMD tmd;
+        TMDLOAD(&tmd, PHYSADDR(s,xmit_cxda));                
+        tmd.tmd2.buff = tmd.tmd2.uflo = tmd.tmd1.err = 1;
+        tmd.tmd1.own = 0;
+        TMDSTORE(&tmd, PHYSADDR(s,xmit_cxda));
+        s->csr[0] |= 0x0200;    /* set TINT */
+        if (!CSR_DXSUFLO(s)) {
+            s->csr[0] &= ~0x0010;
+        } else
+        if (count--)
+          goto txagain;
+    }
+}
+
+static void pcnet_poll(PCNetState *s)
+{
+    if (CSR_RXON(s)) {
+        pcnet_rdte_poll(s);
+    }
+
+    if (CSR_TDMD(s) || 
+        (CSR_TXON(s) && !CSR_DPOLL(s) && pcnet_tdte_poll(s)))
+        pcnet_transmit(s);
+}
+
+static void pcnet_poll_timer(void *opaque)
+{
+    PCNetState *s = opaque;
+
+    qemu_del_timer(s->poll_timer);
+
+    if (CSR_TDMD(s)) {
+        pcnet_transmit(s);
+    }
+
+    pcnet_update_irq(s);    
+
+    if (!CSR_STOP(s) && !CSR_SPND(s) && !CSR_DPOLL(s)) {
+        uint64_t now = qemu_get_clock(vm_clock) * 33;
+        if (!s->timer || !now)
+            s->timer = now;
+        else {
+            uint64_t t = now - s->timer + CSR_POLL(s);
+            if (t > 0xffffLL) {
+                pcnet_poll(s);
+                CSR_POLL(s) = CSR_PINT(s);
+            } else
+                CSR_POLL(s) = t;
+        }
+        qemu_mod_timer(s->poll_timer, 
+            pcnet_get_next_poll_time(s,qemu_get_clock(vm_clock)));
+    }
+}
+
+
+static void pcnet_csr_writew(PCNetState *s, uint32_t rap, uint32_t new_value)
+{
+    uint16_t val = new_value;
+#ifdef PCNET_DEBUG_CSR
+    printf("pcnet_csr_writew rap=%d val=0x%04x\n", rap, val);
+#endif
+    switch (rap) {
+    case 0:
+        s->csr[0] &= ~(val & 0x7f00); /* Clear any interrupt flags */
+
+        s->csr[0] = (s->csr[0] & ~0x0040) | (val & 0x0048);
+
+        val = (val & 0x007f) | (s->csr[0] & 0x7f00);
+
+        /* IFF STOP, STRT and INIT are set, clear STRT and INIT */
+        if ((val&7) == 7)
+          val &= ~3;
+
+        if (!CSR_STOP(s) && (val & 4))
+            pcnet_stop(s);
+
+        if (!CSR_INIT(s) && (val & 1))
+            pcnet_init(s);
+
+        if (!CSR_STRT(s) && (val & 2))
+            pcnet_start(s);
+
+        if (CSR_TDMD(s)) 
+            pcnet_transmit(s);
+
+        return;
+    case 1:
+    case 2:
+    case 8:
+    case 9:
+    case 10:
+    case 11:
+    case 12:
+    case 13:
+    case 14:
+    case 15:
+    case 18: /* CRBAL */
+    case 19: /* CRBAU */
+    case 20: /* CXBAL */
+    case 21: /* CXBAU */
+    case 22: /* NRBAU */
+    case 23: /* NRBAU */
+    case 24:
+    case 25:
+    case 26:
+    case 27:
+    case 28:
+    case 29:
+    case 30:
+    case 31:
+    case 32:
+    case 33:
+    case 34:
+    case 35:
+    case 36:
+    case 37:
+    case 38:
+    case 39:
+    case 40: /* CRBC */
+    case 41:
+    case 42: /* CXBC */
+    case 43:
+    case 44:
+    case 45:
+    case 46: /* POLL */
+    case 47: /* POLLINT */
+    case 72:
+    case 74:
+    case 76: /* RCVRL */
+    case 78: /* XMTRL */
+    case 112:
+       if (CSR_STOP(s) || CSR_SPND(s))
+           break;
+       return;
+    case 3:
+        break;
+    case 4:
+        s->csr[4] &= ~(val & 0x026a); 
+        val &= ~0x026a; val |= s->csr[4] & 0x026a;
+        break;
+    case 5:
+        s->csr[5] &= ~(val & 0x0a90); 
+        val &= ~0x0a90; val |= s->csr[5] & 0x0a90;
+        break;
+    case 16:
+        pcnet_csr_writew(s,1,val);
+        return;
+    case 17:
+        pcnet_csr_writew(s,2,val);
+        return;
+    case 58:
+        pcnet_bcr_writew(s,BCR_SWS,val);
+        break;
+    default:
+        return;
+    }
+    s->csr[rap] = val;
+}
+
+static uint32_t pcnet_csr_readw(PCNetState *s, uint32_t rap)
+{
+    uint32_t val;
+    switch (rap) {
+    case 0:
+        pcnet_update_irq(s);
+        val = s->csr[0];
+        val |= (val & 0x7800) ? 0x8000 : 0;
+        break;
+    case 16:
+        return pcnet_csr_readw(s,1);
+    case 17:
+        return pcnet_csr_readw(s,2);
+    case 58:
+        return pcnet_bcr_readw(s,BCR_SWS);
+    case 88:
+        val = s->csr[89];
+        val <<= 16;
+        val |= s->csr[88];
+        break;
+    default:
+        val = s->csr[rap];
+    }
+#ifdef PCNET_DEBUG_CSR
+    printf("pcnet_csr_readw rap=%d val=0x%04x\n", rap, val);
+#endif
+    return val;
+}
+
+static void pcnet_bcr_writew(PCNetState *s, uint32_t rap, uint32_t val)
+{
+    rap &= 127;
+#ifdef PCNET_DEBUG_BCR
+    printf("pcnet_bcr_writew rap=%d val=0x%04x\n", rap, val);
+#endif
+    switch (rap) {
+    case BCR_SWS:
+        if (!(CSR_STOP(s) || CSR_SPND(s)))
+            return;
+        val &= ~0x0300;
+        switch (val & 0x00ff) {
+        case 0:
+            val |= 0x0200;
+            break;
+        case 1:
+            val |= 0x0100;
+            break;
+        case 2:
+        case 3:
+            val |= 0x0300;
+            break;
+        default:
+            printf("Bad SWSTYLE=0x%02x\n", val & 0xff);
+            val = 0x0200;
+            break;
+        }
+#ifdef PCNET_DEBUG
+       printf("BCR_SWS=0x%04x\n", val);
+#endif
+    case BCR_LNKST:
+    case BCR_LED1:
+    case BCR_LED2:
+    case BCR_LED3:
+    case BCR_MC:
+    case BCR_FDC:
+    case BCR_BSBC:
+    case BCR_EECAS:
+    case BCR_PLAT:
+        s->bcr[rap] = val;
+        break;
+    default:
+        break;
+    }
+}
+
+static uint32_t pcnet_bcr_readw(PCNetState *s, uint32_t rap)
+{
+    uint32_t val;
+    rap &= 127;
+    switch (rap) {
+    case BCR_LNKST:
+    case BCR_LED1:
+    case BCR_LED2:
+    case BCR_LED3:
+        val = s->bcr[rap] & ~0x8000;
+        val |= (val & 0x017f & s->lnkst) ? 0x8000 : 0;
+        break;
+    default:
+        val = rap < 32 ? s->bcr[rap] : 0;
+        break;
+    }
+#ifdef PCNET_DEBUG_BCR
+    printf("pcnet_bcr_readw rap=%d val=0x%04x\n", rap, val);
+#endif
+    return val;
+}
+
+static void pcnet_h_reset(PCNetState *s)
+{
+    int i;
+    uint16_t checksum;
+
+    /* Initialize the PROM */
+
+    memcpy(s->prom, s->nd->macaddr, 6);
+    s->prom[12] = s->prom[13] = 0x00;
+    s->prom[14] = s->prom[15] = 0x57;
+
+    for (i = 0,checksum = 0; i < 16; i++)
+        checksum += s->prom[i];
+    *(uint16_t *)&s->prom[12] = cpu_to_le16(checksum);
+
+
+    s->bcr[BCR_MSRDA] = 0x0005;
+    s->bcr[BCR_MSWRA] = 0x0005;
+    s->bcr[BCR_MC   ] = 0x0002;
+    s->bcr[BCR_LNKST] = 0x00c0;
+    s->bcr[BCR_LED1 ] = 0x0084;
+    s->bcr[BCR_LED2 ] = 0x0088;
+    s->bcr[BCR_LED3 ] = 0x0090;
+    s->bcr[BCR_FDC  ] = 0x0000;
+    s->bcr[BCR_BSBC ] = 0x9001;
+    s->bcr[BCR_EECAS] = 0x0002;
+    s->bcr[BCR_SWS  ] = 0x0200;
+    s->bcr[BCR_PLAT ] = 0xff06;
+
+    pcnet_s_reset(s);
+}
+
+static void pcnet_aprom_writeb(void *opaque, uint32_t addr, uint32_t val)
+{
+    PCNetState *s = opaque;
+#ifdef PCNET_DEBUG
+    printf("pcnet_aprom_writeb addr=0x%08x val=0x%02x\n", addr, val);
+#endif    
+    /* Check APROMWE bit to enable write access */
+    if (pcnet_bcr_readw(s,2) & 0x80)
+        s->prom[addr & 15] = val;
+}       
+
+static uint32_t pcnet_aprom_readb(void *opaque, uint32_t addr)
+{
+    PCNetState *s = opaque;
+    uint32_t val = s->prom[addr &= 15];
+#ifdef PCNET_DEBUG
+    printf("pcnet_aprom_readb addr=0x%08x val=0x%02x\n", addr, val);
+#endif
+    return val;
+}
+
+static void pcnet_ioport_writew(void *opaque, uint32_t addr, uint32_t val)
+{
+    PCNetState *s = opaque;
+    pcnet_poll_timer(s);
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_ioport_writew addr=0x%08x val=0x%04x\n", addr, val);
+#endif
+    if (!BCR_DWIO(s)) {
+        switch (addr & 0x0f) {
+        case 0x00: /* RDP */
+            pcnet_csr_writew(s, s->rap, val);
+            break;
+        case 0x02:
+            s->rap = val & 0x7f;
+            break;
+        case 0x06:
+            pcnet_bcr_writew(s, s->rap, val);
+            break;
+        }
+    }
+    pcnet_update_irq(s);
+}
+
+static uint32_t pcnet_ioport_readw(void *opaque, uint32_t addr)
+{
+    PCNetState *s = opaque;
+    uint32_t val = -1;
+    pcnet_poll_timer(s);
+    if (!BCR_DWIO(s)) {
+        switch (addr & 0x0f) {
+        case 0x00: /* RDP */
+            val = pcnet_csr_readw(s, s->rap);
+            break;
+        case 0x02:
+            val = s->rap;
+            break;
+        case 0x04:
+            pcnet_s_reset(s);
+            val = 0;
+            break;
+        case 0x06:
+            val = pcnet_bcr_readw(s, s->rap);
+            break;
+        }
+    }
+    pcnet_update_irq(s);
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_ioport_readw addr=0x%08x val=0x%04x\n", addr, val & 0xffff);
+#endif
+    return val;
+}
+
+static void pcnet_ioport_writel(void *opaque, uint32_t addr, uint32_t val)
+{
+    PCNetState *s = opaque;
+    pcnet_poll_timer(s);
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_ioport_writel addr=0x%08x val=0x%08x\n", addr, val);
+#endif
+    if (BCR_DWIO(s)) {
+        switch (addr & 0x0f) {
+        case 0x00: /* RDP */
+            pcnet_csr_writew(s, s->rap, val & 0xffff);
+            break;
+        case 0x04:
+            s->rap = val & 0x7f;
+            break;
+        case 0x0c:
+            pcnet_bcr_writew(s, s->rap, val & 0xffff);
+            break;
+        }
+    } else
+    if ((addr & 0x0f) == 0) {
+        /* switch device to dword i/o mode */
+        pcnet_bcr_writew(s, BCR_BSBC, pcnet_bcr_readw(s, BCR_BSBC) | 0x0080);
+#ifdef PCNET_DEBUG_IO
+        printf("device switched into dword i/o mode\n");
+#endif        
+    }
+    pcnet_update_irq(s);
+}
+
+static uint32_t pcnet_ioport_readl(void *opaque, uint32_t addr)
+{
+    PCNetState *s = opaque;
+    uint32_t val = -1;
+    pcnet_poll_timer(s);
+    if (BCR_DWIO(s)) {  
+        switch (addr & 0x0f) {
+        case 0x00: /* RDP */
+            val = pcnet_csr_readw(s, s->rap);
+            break;
+        case 0x04:
+            val = s->rap;
+            break;
+        case 0x08:
+            pcnet_s_reset(s);
+            val = 0;
+            break;
+        case 0x0c:
+            val = pcnet_bcr_readw(s, s->rap);
+            break;
+        }
+    }
+    pcnet_update_irq(s);
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_ioport_readl addr=0x%08x val=0x%08x\n", addr, val);
+#endif
+    return val;
+}
+
+static void pcnet_ioport_map(PCIDevice *pci_dev, int region_num, 
+                             uint32_t addr, uint32_t size, int type)
+{
+    PCNetState *d = (PCNetState *)pci_dev;
+
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_ioport_map addr=0x%04x size=0x%04x\n", addr, size);
+#endif
+
+    register_ioport_write(addr, 16, 1, pcnet_aprom_writeb, d);
+    register_ioport_read(addr, 16, 1, pcnet_aprom_readb, d);
+    
+    register_ioport_write(addr + 0x10, 0x10, 2, pcnet_ioport_writew, d);
+    register_ioport_read(addr + 0x10, 0x10, 2, pcnet_ioport_readw, d);
+    register_ioport_write(addr + 0x10, 0x10, 4, pcnet_ioport_writel, d);
+    register_ioport_read(addr + 0x10, 0x10, 4, pcnet_ioport_readl, d);
+}
+
+static void pcnet_mmio_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    PCNetState *d = opaque;
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_mmio_writeb addr=0x%08x val=0x%02x\n", addr, val);
+#endif
+    if (!(addr & 0x10))
+        pcnet_aprom_writeb(d, addr & 0x0f, val);
+}
+
+static uint32_t pcnet_mmio_readb(void *opaque, target_phys_addr_t addr) 
+{
+    PCNetState *d = opaque;
+    uint32_t val = -1;
+    if (!(addr & 0x10))
+        val = pcnet_aprom_readb(d, addr & 0x0f);
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_mmio_readb addr=0x%08x val=0x%02x\n", addr, val & 0xff);
+#endif
+    return val;
+}
+
+static void pcnet_mmio_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    PCNetState *d = opaque;
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_mmio_writew addr=0x%08x val=0x%04x\n", addr, val);
+#endif
+    if (addr & 0x10)
+        pcnet_ioport_writew(d, addr & 0x0f, val);
+    else {
+        addr &= 0x0f;
+        pcnet_aprom_writeb(d, addr, val & 0xff);
+        pcnet_aprom_writeb(d, addr+1, (val & 0xff00) >> 8);
+    }
+}
+
+static uint32_t pcnet_mmio_readw(void *opaque, target_phys_addr_t addr) 
+{
+    PCNetState *d = opaque;
+    uint32_t val = -1;
+    if (addr & 0x10)
+        val = pcnet_ioport_readw(d, addr & 0x0f);
+    else {
+        addr &= 0x0f;
+        val = pcnet_aprom_readb(d, addr+1);
+        val <<= 8;
+        val |= pcnet_aprom_readb(d, addr);
+    }
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_mmio_readw addr=0x%08x val = 0x%04x\n", addr, val & 0xffff);
+#endif
+    return val;
+}
+
+static void pcnet_mmio_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    PCNetState *d = opaque;
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_mmio_writel addr=0x%08x val=0x%08x\n", addr, val);
+#endif
+    if (addr & 0x10)
+        pcnet_ioport_writel(d, addr & 0x0f, val);
+    else {
+        addr &= 0x0f;
+        pcnet_aprom_writeb(d, addr, val & 0xff);
+        pcnet_aprom_writeb(d, addr+1, (val & 0xff00) >> 8);
+        pcnet_aprom_writeb(d, addr+2, (val & 0xff0000) >> 16);
+        pcnet_aprom_writeb(d, addr+3, (val & 0xff000000) >> 24);
+    }
+}
+
+static uint32_t pcnet_mmio_readl(void *opaque, target_phys_addr_t addr) 
+{
+    PCNetState *d = opaque;
+    uint32_t val;
+    if (addr & 0x10)
+        val = pcnet_ioport_readl(d, addr & 0x0f);
+    else {
+        addr &= 0x0f;
+        val = pcnet_aprom_readb(d, addr+3);
+        val <<= 8;
+        val |= pcnet_aprom_readb(d, addr+2);
+        val <<= 8;
+        val |= pcnet_aprom_readb(d, addr+1);
+        val <<= 8;
+        val |= pcnet_aprom_readb(d, addr);
+    }
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_mmio_readl addr=0x%08x val=0x%08x\n", addr, val);
+#endif
+    return val;
+}
+
+
+static CPUWriteMemoryFunc *pcnet_mmio_write[] = {
+    (CPUWriteMemoryFunc *)&pcnet_mmio_writeb,
+    (CPUWriteMemoryFunc *)&pcnet_mmio_writew,
+    (CPUWriteMemoryFunc *)&pcnet_mmio_writel
+};
+
+static CPUReadMemoryFunc *pcnet_mmio_read[] = {
+    (CPUReadMemoryFunc *)&pcnet_mmio_readb,
+    (CPUReadMemoryFunc *)&pcnet_mmio_readw,
+    (CPUReadMemoryFunc *)&pcnet_mmio_readl
+};
+
+static void pcnet_mmio_map(PCIDevice *pci_dev, int region_num, 
+                            uint32_t addr, uint32_t size, int type)
+{
+    PCNetState *d = (PCNetState *)pci_dev;
+
+#ifdef PCNET_DEBUG_IO
+    printf("pcnet_ioport_map addr=0x%08x 0x%08x\n", addr, size);
+#endif
+
+    cpu_register_physical_memory(addr, PCNET_PNPMMIO_SIZE, d->mmio_io_addr);
+}
+
+void pci_pcnet_init(PCIBus *bus, NICInfo *nd)
+{
+    PCNetState *d;
+    uint8_t *pci_conf;
+
+#if 0
+    printf("sizeof(RMD)=%d, sizeof(TMD)=%d\n", 
+        sizeof(struct pcnet_RMD), sizeof(struct pcnet_TMD));
+#endif
+
+    d = (PCNetState *)pci_register_device(bus, "PCNet", sizeof(PCNetState),
+                                          -1, NULL, NULL);
+                                          
+    pci_conf = d->dev.config;
+    
+    *(uint16_t *)&pci_conf[0x00] = cpu_to_le16(0x1022);
+    *(uint16_t *)&pci_conf[0x02] = cpu_to_le16(0x2000);    
+    *(uint16_t *)&pci_conf[0x04] = cpu_to_le16(0x0007); 
+    *(uint16_t *)&pci_conf[0x06] = cpu_to_le16(0x0280);
+    pci_conf[0x08] = 0x10;
+    pci_conf[0x09] = 0x00;
+    pci_conf[0x0a] = 0x00; // ethernet network controller 
+    pci_conf[0x0b] = 0x02;
+    pci_conf[0x0e] = 0x00; // header_type
+    
+    *(uint32_t *)&pci_conf[0x10] = cpu_to_le32(0x00000001);
+    *(uint32_t *)&pci_conf[0x14] = cpu_to_le32(0x00000000);
+    
+    pci_conf[0x3d] = 1; // interrupt pin 0
+    pci_conf[0x3e] = 0x06;
+    pci_conf[0x3f] = 0xff;
+
+    /* Handler for memory-mapped I/O */
+    d->mmio_io_addr =
+      cpu_register_io_memory(0, pcnet_mmio_read, pcnet_mmio_write, d);
+
+    pci_register_io_region((PCIDevice *)d, 0, PCNET_IOPORT_SIZE, 
+                           PCI_ADDRESS_SPACE_IO, pcnet_ioport_map);
+                           
+    pci_register_io_region((PCIDevice *)d, 1, PCNET_PNPMMIO_SIZE, 
+                           PCI_ADDRESS_SPACE_MEM, pcnet_mmio_map);
+                           
+    d->poll_timer = qemu_new_timer(vm_clock, pcnet_poll_timer, d);
+
+    d->nd = nd;
+
+    d->vc = qemu_new_vlan_client(nd->vlan, pcnet_receive, 
+                                 pcnet_can_receive, d);
+    
+    snprintf(d->vc->info_str, sizeof(d->vc->info_str),
+             "pcnet macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
+             d->nd->macaddr[0],
+             d->nd->macaddr[1],
+             d->nd->macaddr[2],
+             d->nd->macaddr[3],
+             d->nd->macaddr[4],
+             d->nd->macaddr[5]);
+
+    pcnet_h_reset(d);
+}
diff --git a/vl.h b/vl.h
index 244310fee1..661e4fd5e6 100644
--- a/vl.h
+++ b/vl.h
@@ -828,6 +828,10 @@ void pci_ne2000_init(PCIBus *bus, NICInfo *nd);
 
 void pci_rtl8139_init(PCIBus *bus, NICInfo *nd);
 
+/* pcnet.c */
+
+void pci_pcnet_init(PCIBus *bus, NICInfo *nd);
+
 /* pckbd.c */
 
 void kbd_init(void);