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/*

 * 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

 */

/*

 * On Sparc32, this is the Lance (Am7990) part of chip STP2000 (Master I/O), also

 * produced as NCR89C100. See

 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt

 * and

 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR92C990.txt

 */

/* TODO: remove little endian host assumptions */

#include "vl.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;

    PCIDevice *pci_dev;

    VLANClientState *vc;

    NICInfo *nd;

    QEMUTimer *poll_timer;

    int mmio_index, rap, isr, lnkst;

    uint32_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];

    int tx_busy;

    void (*set_irq_cb)(void *s, int isr);

    void (*phys_mem_read)(void *dma_opaque, target_phys_addr_t addr,

                         uint8_t *buf, int len);

    void (*phys_mem_write)(void *dma_opaque, target_phys_addr_t addr,

                          uint8_t *buf, int len);

    void *dma_opaque;

};

/* XXX: using bitfields for target memory structures is almost surely

   not portable, so it should be suppressed ASAP */

#ifdef __GNUC__

#define PACKED_FIELD(A) A __attribute__ ((packed))

#else

#error FixMe

#endif

struct qemu_ether_header {

    uint8_t ether_dhost[6];

    uint8_t ether_shost[6];

    uint16_t ether_type;

};

/* 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_BIGENDIAN(S) !!(((S)->csr[3])&0x0004)

#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 padr[3];

    uint16_t ladrf[4];

    uint32_t rdra;

    uint32_t tdra;

};

struct pcnet_initblk32 {

    uint16_t mode;

    uint8_t rlen;

    uint8_t tlen;

    uint16_t padr[3];

    uint16_t _res;

    uint16_t ladrf[4];

    uint32_t rdra;

    uint32_t tdra;

};

struct pcnet_TMD {

    struct {

        unsigned tbadr:32;

    } tmd0;

    struct {

        unsigned PACKED_FIELD(bcnt:12), PACKED_FIELD(ones:4), PACKED_FIELD(res:7), PACKED_FIELD(bpe:1);

        unsigned PACKED_FIELD(enp:1), PACKED_FIELD(stp:1), PACKED_FIELD(def:1), PACKED_FIELD(one:1);

        unsigned PACKED_FIELD(ltint:1), PACKED_FIELD(nofcs:1), PACKED_FIELD(err:1), PACKED_FIELD(own:1);

    } tmd1;

    struct {

        unsigned PACKED_FIELD(trc:4), PACKED_FIELD(res:12);

        unsigned PACKED_FIELD(tdr:10), PACKED_FIELD(rtry:1), PACKED_FIELD(lcar:1);

        unsigned PACKED_FIELD(lcol:1), PACKED_FIELD(exdef:1), PACKED_FIELD(uflo:1), PACKED_FIELD(buff:1);

    } tmd2;

    struct {

        unsigned res:32;

    } tmd3;    

};

struct pcnet_RMD {

    struct {

        unsigned rbadr:32;

    } rmd0;

    struct {

        unsigned PACKED_FIELD(bcnt:12), PACKED_FIELD(ones:4), PACKED_FIELD(res:4);

        unsigned PACKED_FIELD(bam:1), PACKED_FIELD(lafm:1), PACKED_FIELD(pam:1), PACKED_FIELD(bpe:1);

        unsigned PACKED_FIELD(enp:1), PACKED_FIELD(stp:1), PACKED_FIELD(buff:1), PACKED_FIELD(crc:1);

        unsigned PACKED_FIELD(oflo:1), PACKED_FIELD(fram:1), PACKED_FIELD(err:1), PACKED_FIELD(own:1);

    } rmd1;

    struct {

        unsigned PACKED_FIELD(mcnt:12), PACKED_FIELD(zeros:4);

        unsigned PACKED_FIELD(rpc:8), PACKED_FIELD(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 *tmd1, 

                                  target_phys_addr_t addr)

{

    uint32_t *tmd = (uint32_t *)tmd1;

    if (!BCR_SWSTYLE(s)) {

        uint16_t xda[4];

        s->phys_mem_read(s->dma_opaque, addr,

                (void *)&xda[0], sizeof(xda));

        if (CSR_BIGENDIAN(s)) {

            be16_to_cpus(&xda[0]);

            be16_to_cpus(&xda[1]);

            be16_to_cpus(&xda[2]);

            be16_to_cpus(&xda[3]);

        } else {

            le16_to_cpus(&xda[0]);

            le16_to_cpus(&xda[1]);

            le16_to_cpus(&xda[2]);

            le16_to_cpus(&xda[3]);

        }

        tmd[0] = (xda[0]&0xffff) |

            ((xda[1]&0x00ff) << 16);

        tmd[1] = (xda[2]&0xffff)|

            ((xda[1] & 0xff00) << 16);

        tmd[2] =

            (xda[3] & 0xffff) << 16;

        tmd[3] = 0;

    } else {

        uint32_t xda[4];

        s->phys_mem_read(s->dma_opaque, addr,

                (void *)&xda[0], sizeof(xda));

        if (CSR_BIGENDIAN(s)) {

            be32_to_cpus(&xda[0]);

            be32_to_cpus(&xda[1]);

            be32_to_cpus(&xda[2]);

            be32_to_cpus(&xda[3]);

        } else {

            le32_to_cpus(&xda[0]);

            le32_to_cpus(&xda[1]);

            le32_to_cpus(&xda[2]);

            le32_to_cpus(&xda[3]);

        }

        if (BCR_SWSTYLE(s) != 3) {

            memcpy(tmd, xda, sizeof(xda));

        } else {

            tmd[0] = xda[2];

            tmd[1] = xda[1];

            tmd[2] = xda[0];

            tmd[3] = xda[3];

        }

    }

}

static inline void pcnet_tmd_store(PCNetState *s, const struct pcnet_TMD *tmd1,

                                   target_phys_addr_t addr)

{

    const uint32_t *tmd = (const uint32_t *)tmd1;

    if (!BCR_SWSTYLE(s)) {

        uint16_t xda[4];

        xda[0] = tmd[0] & 0xffff;

        xda[1] = ((tmd[0]>>16)&0x00ff) |

            ((tmd[1]>>16)&0xff00);

        xda[2] = tmd[1] & 0xffff;

        xda[3] = tmd[2] >> 16;

        if (CSR_BIGENDIAN(s)) {

            cpu_to_be16s(&xda[0]);

            cpu_to_be16s(&xda[1]);

            cpu_to_be16s(&xda[2]);

            cpu_to_be16s(&xda[3]);

        } else {

            cpu_to_le16s(&xda[0]);

            cpu_to_le16s(&xda[1]);

            cpu_to_le16s(&xda[2]);

            cpu_to_le16s(&xda[3]);

        }

        s->phys_mem_write(s->dma_opaque, addr,

                (void *)&xda[0], sizeof(xda));

    } else {

        uint32_t xda[4];

        if (BCR_SWSTYLE(s) != 3) {

            memcpy(xda, tmd, sizeof(xda));

        } else {

            xda[0] = tmd[2];

            xda[1] = tmd[1];

            xda[2] = tmd[0];

            xda[3] = tmd[3];

        }

        if (CSR_BIGENDIAN(s)) {

            cpu_to_be32s(&xda[0]);

            cpu_to_be32s(&xda[1]);

            cpu_to_be32s(&xda[2]);

            cpu_to_be32s(&xda[3]);

        } else {

            cpu_to_le32s(&xda[0]);

            cpu_to_le32s(&xda[1]);

            cpu_to_le32s(&xda[2]);

            cpu_to_le32s(&xda[3]);

        }

        s->phys_mem_write(s->dma_opaque, addr,

                          (void *)&xda[0], sizeof(xda));

    }

}

static inline void pcnet_rmd_load(PCNetState *s, struct pcnet_RMD *rmd1,

                                  target_phys_addr_t addr)

{

    uint32_t *rmd = (uint32_t *)rmd1;

    if (!BCR_SWSTYLE(s)) {

        uint16_t rda[4];

        s->phys_mem_read(s->dma_opaque, addr, (void *)&rda[0], sizeof(rda));

        if (CSR_BIGENDIAN(s)) {

            be16_to_cpus(&rda[0]);

            be16_to_cpus(&rda[1]);

            be16_to_cpus(&rda[2]);

            be16_to_cpus(&rda[3]);

        } else {

            le16_to_cpus(&rda[0]);

            le16_to_cpus(&rda[1]);

            le16_to_cpus(&rda[2]);

            le16_to_cpus(&rda[3]);

        }

        rmd[0] = (rda[0]&0xffff)|

            ((rda[1] & 0x00ff) << 16);

        rmd[1] = (rda[2]&0xffff)|

            ((rda[1] & 0xff00) << 16);

        rmd[2] = rda[3] & 0xffff;

        rmd[3] = 0;

    } else {

        uint32_t rda[4];

        s->phys_mem_read(s->dma_opaque, addr, (void *)&rda[0], sizeof(rda));

        if (CSR_BIGENDIAN(s)) {

            be32_to_cpus(&rda[0]);

            be32_to_cpus(&rda[1]);

            be32_to_cpus(&rda[2]);

            be32_to_cpus(&rda[3]);

        } else {

            le32_to_cpus(&rda[0]);

            le32_to_cpus(&rda[1]);

            le32_to_cpus(&rda[2]);

            le32_to_cpus(&rda[3]);

        }

        if (BCR_SWSTYLE(s) != 3) {

            memcpy(rmd, rda, sizeof(rda));

        } else {

            rmd[0] = rda[2];

            rmd[1] = rda[1];

            rmd[2] = rda[0];

            rmd[3] = rda[3];

        }

    }

}

static inline void pcnet_rmd_store(PCNetState *s, struct pcnet_RMD *rmd1, 

                                   target_phys_addr_t addr)

{

    const uint32_t *rmd = (const uint32_t *)rmd1;

    if (!BCR_SWSTYLE(s)) {

        uint16_t rda[4];

        rda[0] = rmd[0] & 0xffff;

        rda[1] = ((rmd[0]>>16)&0xff)|

            ((rmd[1]>>16)&0xff00);

        rda[2] = rmd[1] & 0xffff;

        rda[3] = rmd[2] & 0xffff;

        if (CSR_BIGENDIAN(s)) {

            cpu_to_be16s(&rda[0]);

            cpu_to_be16s(&rda[1]);

            cpu_to_be16s(&rda[2]);

            cpu_to_be16s(&rda[3]);

        } else {

            cpu_to_le16s(&rda[0]);

            cpu_to_le16s(&rda[1]);

            cpu_to_le16s(&rda[2]);

            cpu_to_le16s(&rda[3]);

        }

        s->phys_mem_write(s->dma_opaque, addr,

                (void *)&rda[0], sizeof(rda));

    } else {

        uint32_t rda[4];

        if (BCR_SWSTYLE(s) != 3) {

            memcpy(rda, rmd, sizeof(rda));

        } else {

            rda[0] = rmd[2];

            rda[1] = rmd[1];

            rda[2] = rmd[0];

            rda[3] = rmd[3];

        }

        if (CSR_BIGENDIAN(s)) {

            cpu_to_be32s(&rda[0]);

            cpu_to_be32s(&rda[1]);

            cpu_to_be32s(&rda[2]);

            cpu_to_be32s(&rda[3]);

        } else {

            cpu_to_le32s(&rda[0]);

            cpu_to_le32s(&rda[1]);

            cpu_to_le32s(&rda[2]);

            cpu_to_le32s(&rda[3]);

        }

        s->phys_mem_write(s->dma_opaque, 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];                    \

            s->phys_mem_read(s->dma_opaque, (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];                    \

            s->phys_mem_read(s->dma_opaque, (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];                    \

            s->phys_mem_read(s->dma_opaque, (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];                    \

            s->phys_mem_read(s->dma_opaque, (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];                    \

            s->phys_mem_read(s->dma_opaque, (ADDR),    \

                (void *)&xda[0], sizeof(xda));  \

            (RES) |= (xda[1] & 0x0000f000L)!=0x0000f000L; \

        } while (0);                            \

        break;                                  \

    }                                           \

} while (0)

#endif

#define PRINT_PKTHDR(BUF) do {                  \

    struct qemu_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], \

           be16_to_cpu(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 < 6; 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 qemu_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)) && !memcmp(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 qemu_ether_header *hdr = (void *)buf;

    int result = !CSR_DRCVBC(s) && !memcmp(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 qemu_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;

    s->tx_busy = 0;

}

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;