FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/gemreg.h

     /*      $NetBSD: gemreg.h,v 1.9.2.1 2008/05/17 16:36:08 bouyer Exp $ */
     
     /*
      *
      * Copyright (C) 2001 Eduardo Horvath.
      * All rights reserved.
      *
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR  ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR  BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    
    #ifndef _IF_GEMREG_H
    #define _IF_GEMREG_H
    
    /*
     * Register definitions for Sun GEM Gigabit Ethernet
     * See `GEM Gigabit Ethernet ASIC Specification'
     *   http://www.sun.com/processors/manuals/ge.pdf
     * Section 3.1.3 GEM Register Space (from Rev 1.2)
     */
    
    /*
     * Global Resources
     * Section 3.1.4.1
     *
     * First bank: this registers live at the start of the PCI
     * mapping, and at the start of the second bank of the SBUS
     * version.
     */
    #define GEM_SEB_STATE           0x0000  /* SEB State (R/O) */
    #define GEM_CONFIG              0x0004  /* Configuration */
    #define GEM_STATUS              0x000c  /* Status */
    /* Note: Reading the status register auto-clears bits 0-6 */
    #define GEM_INTMASK             0x0010  /* Interrupt Mask */
    #define GEM_INTACK              0x0014  /* Interrupt Acknowledge (W/O) */
    #define GEM_STATUS_ALIAS        0x001c  /* Status Alias */
    /* This is the same as GEM_STATUS but reading it does not auto-clear bits. */
    
    /*
     * Second bank: this registers live at offset 0x1000 of the PCI
     * mapping, and at the start of the first bank of the SBUS
     * version.
     */
    #define GEM_PCI_BANK2_OFFSET    0x1000
    #define GEM_PCI_BANK2_SIZE      0x14
    #define GEM_ERROR_STATUS        0x0000  /* PCI error Status */
    #define GEM_ERROR_MASK          0x0004  /* PCI Error Mask */
    #define GEM_SBUS_CONFIG         0x0004
    #define GEM_BIF_CONFIG          0x0008  /* BIF Configuration */
    #define GEM_BIF_DIAG            0x000c  /* BIF Diagnostic */
    #define GEM_RESET               0x0010  /* Software Reset */
    
    
    /*
     * Bits in GEM_SEB_STATE register
     * For diagnostic use
     */
    #define GEM_SEB_ARB             0x000000002     /* Arbitration status */
    #define GEM_SEB_RXWON           0x000000004
    
    /*
     * Bits in GEM_CONFIG register
     * Default: 0x00042
     */
    #define GEM_CONFIG_BURST_64     0x000000000     /* 0->infinity, 1->64KB */
    #define GEM_CONFIG_BURST_INF    0x000000001     /* 0->infinity, 1->64KB */
    #define GEM_CONFIG_TXDMA_LIMIT  0x00000003e
    #define GEM_CONFIG_RXDMA_LIMIT  0x0000007c0
    /* GEM_CONFIG_RONPAULBIT and GEM_CONFIG_BUG2FIX are Apple only. */
    #define GEM_CONFIG_RONPAULBIT   0x000000800     /* after infinite burst use
                                                     * memory read multiple for
                                                     * PCI commands */
    #define GEM_CONFIG_BUG2FIX      0x000001000     /* fix RX hang after overflow */
    
    #define GEM_CONFIG_TXDMA_LIMIT_SHIFT    1
    #define GEM_CONFIG_RXDMA_LIMIT_SHIFT    6
    
    
    /*
    * Interrupt bits, for both the GEM_STATUS and GEM_INTMASK regs.
    * Bits 0-6 auto-clear when read.
    */
   #define GEM_INTR_TX_INTME       0x000000001     /* Frame w/INTME bit set sent */
   #define GEM_INTR_TX_EMPTY       0x000000002     /* TX ring empty */
   #define GEM_INTR_TX_DONE        0x000000004     /* TX complete */
   #define GEM_INTR_RX_DONE        0x000000010     /* Got a packet */
   #define GEM_INTR_RX_NOBUF       0x000000020     /* No free receive buffers */
   #define GEM_INTR_RX_TAG_ERR     0x000000040     /* RX Tag framing error */
   #define GEM_INTR_PERR           0x000000080     /* Parity error */
   #define GEM_INTR_PCS            0x000002000     /* PCS interrupt */
   #define GEM_INTR_TX_MAC         0x000004000     /* TX MAC interrupt */
   #define GEM_INTR_RX_MAC         0x000008000     /* RX MAC interrupt */
   #define GEM_INTR_MAC_CONTROL    0x000010000     /* MAC control interrupt */
   #define GEM_INTR_MIF            0x000020000     /* MIF interrupt */
   #define GEM_INTR_BERR           0x000040000     /* Bus error interrupt */
   #define GEM_INTR_BITS   "\177\020"                                      \
                           "b\0INTME\0b\1TXEMPTY\0b\2TXDONE\0"             \
                           "b\4RXDONE\0b\5RXNOBUF\0b\6RX_TAG_ERR\0"        \
                           "b\xdPCS\0b\xeTXMAC\0b\xfRXMAC\0"               \
                           "b\x10MAC_CONTROL\0b\x11MIF\0b\x12IBERR\0\0"
   
   /* Top part (bits 19-31) of GEM_STATUS has TX completion information */
   #define GEM_STATUS_TX_COMPL     0xfff800000     /* TX completion reg. */
   
   
   /*
    * Bits in GEM_ERROR_STATUS and GEM_ERROR_MASK PCI registers
    */
   #define GEM_ERROR_STAT_BADACK   0x000000001     /* No ACK64# */
   #define GEM_ERROR_STAT_DTRTO    0x000000002     /* Delayed xaction timeout */
   #define GEM_ERROR_STAT_OTHERS   0x000000004     /* Other PCI errors.  Read PCI
                                                      Status Register in PCI
                                                      Configuration space */
   #define GEM_ERROR_BITS          "\177\020b\0ACKBAD\0b\1DTRTO\0b\2OTHER\0\0"
   
   
   /*
    * Bits in GEM_SBUS_CONFIG register
    */
   #define GEM_SBUS_CFG_BMODE64    0x00000008
   #define GEM_SBUS_CFG_PARITY     0x00000200
   
   
   /*
    * Bits in GEM_BIF_CONFIG register
    * Default: 0x0
    */
   #define GEM_BIF_CONFIG_SLOWCLK  0x000000001     /* Parity error timing */
   #define GEM_BIF_CONFIG_HOST_64  0x000000002     /* 64-bit host */
   #define GEM_BIF_CONFIG_B64D_DIS 0x000000004     /* no 64-bit data cycle */
   #define GEM_BIF_CONFIG_M66EN    0x000000008
   #define GEM_BIF_CONFIG_BITS     "\177\020b\0SLOWCLK\0b\1HOST64\0"       \
                                   "b\2B64DIS\0b\3M66EN\0\0"
   
   
   /*
    * Bits in GEM_BIF_DIAG register
    * Default: 0x00000000
    */
   #define GEN_BIF_DIAG_PCIBURST   0x007f0000      /* PCI Burst Controller state
                                                    * machine */
   #define GEN_BIF_DIAG_STATE      0xff000000      /* BIF state machine */
   
   /*
    * Bits in GEM_RESET register
    * RESET_TX and RESET_RX self clear when complete.
    */
   #define GEM_RESET_TX            0x000000001     /* Reset TX half */
   #define GEM_RESET_RX            0x000000002     /* Reset RX half */
   #define GEM_RESET_GLOBAL        0x000000003     /* Global Reset */
   #define GEM_RESET_RSTOUT        0x000000004     /* Force PCI RSTOUT# */
   
   
   /*
    * TX DMA Programmable Resources
    * Section 3.1.4.2
    * The 53 most significant bits of the Descriptor Base Low/High registers
    * are used as the TX descriptor ring base address.  The ring base must be
    * initialized to a 2KByte-aligned address after power-on or software reset.
    */
   #define GEM_TX_KICK             0x2000          /* TX Kick */
   /* Note: Write last valid desc + 1 */
   #define GEM_TX_CONFIG           0x2004          /* TX Configuration */
   #define GEM_TX_RING_PTR_LO      0x2008          /* TX Descriptor Base Low */
   #define GEM_TX_RING_PTR_HI      0x200c          /* TX Descriptor Base High */
   /*                              0x2010             Reserved */
   #define GEM_TX_FIFO_WR_PTR      0x2014          /* TX FIFO Write Pointer */
   #define GEM_TX_FIFO_SDWR_PTR    0x2018          /* TX FIFO Shadow Write Ptr */
   #define GEM_TX_FIFO_RD_PTR      0x201c          /* TX FIFO Read Pointer */
   #define GEM_TX_FIFO_SDRD_PTR    0x2020          /* TX FIFO Shadow Read Ptr */
   #define GEM_TX_FIFO_PKT_CNT     0x2024          /* TX FIFO Packet Counter */
   #define GEM_TX_STATE_MACHINE    0x2028          /* TX State Machine */
   /*                              0x202c             Unknown */
   #define GEM_TX_DATA_PTR_LO      0x2030          /* TX Data Pointer Low */
   #define GEM_TX_DATA_PTR_HI      0x2034          /* TX Data Pointer High */
   
   #define GEM_TX_COMPLETION       0x2100          /* TX Completion */
   #define GEM_TX_FIFO_ADDRESS     0x2104          /* TX FIFO Address */
   #define GEM_TX_FIFO_TAG         0x2108          /* TX FIFO Tag */
   #define GEM_TX_FIFO_DATA_LO     0x210c          /* TX FIFO Data Low */
   #define GEM_TX_FIFO_DATA_HI_T1  0x2110          /* TX FIFO Data HighT1 */
   #define GEM_TX_FIFO_DATA_HI_T0  0x2114          /* TX FIFO Data HighT0 */
   #define GEM_TX_FIFO_SIZE        0x2118          /* TX FIFO Size */
   #define GEM_TX_DEBUG            0x3028
   
   
   /*
    * Bits in GEM_TX_CONFIG register
    * Default: 0x118c10
    * TX FIFO Threshold should be set to 0x4ff
    */
   #define GEM_TX_CONFIG_TXDMA_EN  0x00000001      /* TX DMA enable */
   #define GEM_TX_CONFIG_TXRING_SZ 0x0000001e      /* TX ring size */
   #define GEM_TX_CONFIG_TXFIFO_SL 0x00000020      /* TX DMA FIFO PIO select */
   #define GEM_TX_CONFIG_TXFIFO_TH 0x001ffc00      /* TX fifo threshold */
   #define GEM_TX_CONFIG_PACED     0x00200000      /* TX_all_int modifier */
   
   #define GEM_RING_SZ_32          (0<<1)  /* 32 descriptors */
   #define GEM_RING_SZ_64          (1<<1)
   #define GEM_RING_SZ_128         (2<<1)
   #define GEM_RING_SZ_256         (3<<1)
   #define GEM_RING_SZ_512         (4<<1)
   #define GEM_RING_SZ_1024        (5<<1)
   #define GEM_RING_SZ_2048        (6<<1)
   #define GEM_RING_SZ_4096        (7<<1)
   #define GEM_RING_SZ_8192        (8<<1)  /* Default */
   
   
   /*
    * Bits in GEM_TX_COMPLETION register
    */
   #define GEM_TX_COMPLETION_MASK  0x00001fff      /* # of last descriptor */
   
   
   /*
    * RX DMA Programmable Resources
    * Section 3.1.4.3
    * The 53 most significant bits of the Descriptor Base Low/High registers
    * are used as the RX descriptor ring base address.  The ring base must be
    * initialized to a 2KByte-aligned address after power-on or software reset.
    */
   #define GEM_RX_CONFIG           0x4000          /* RX Configuration */
   #define GEM_RX_RING_PTR_LO      0x4004          /* RX Descriptor Base Low */
   #define GEM_RX_RING_PTR_HI      0x4008          /* RX Descriptor Base High */
   #define GEM_RX_FIFO_WR_PTR      0x400c          /* RX FIFO Write Pointer */
   #define GEM_RX_FIFO_SDWR_PTR    0x4010          /* RX FIFO Shadow Write Ptr */
   #define GEM_RX_FIFO_RD_PTR      0x4014          /* RX FIFO Read Pointer */
   #define GEM_RX_FIFO_PKT_CNT     0x4018          /* RX FIFO Packet Counter */
   #define GEM_RX_STATE_MACHINE    0x401c          /* RX State Machine */
   #define GEM_RX_PAUSE_THRESH     0x4020          /* Pause Thresholds */
   #define GEM_RX_DATA_PTR_LO      0x4024          /* RX Data Pointer Low */
   #define GEM_RX_DATA_PTR_HI      0x4028          /* RX Data Pointer High */
   
   #define GEM_RX_KICK             0x4100          /* RX Kick */
   /* Note: Write last valid desc + 1.  Must be a multiple of 4 */
   #define GEM_RX_COMPLETION       0x4104          /* RX Completion */
   #define GEM_RX_BLANKING         0x4108          /* RX Blanking */
   #define GEM_RX_FIFO_ADDRESS     0x410c          /* RX FIFO Address */
   #define GEM_RX_FIFO_TAG         0x4110          /* RX FIFO Tag */
   #define GEM_RX_FIFO_DATA_LO     0x4114          /* RX FIFO Data Low */
   #define GEM_RX_FIFO_DATA_HI_T1  0x4118          /* RX FIFO Data HighT0 */
   #define GEM_RX_FIFO_DATA_HI_T0  0x411c          /* RX FIFO Data HighT1 */
   #define GEM_RX_FIFO_SIZE        0x4120          /* RX FIFO Size */
   
   
   /*
    * Bits in GEM_RX_CONFIG register
    * Default: 0x1000010
    */
   #define GEM_RX_CONFIG_RXDMA_EN  0x00000001      /* RX DMA enable */
   #define GEM_RX_CONFIG_RXRING_SZ 0x0000001e      /* RX ring size */
   #define GEM_RX_CONFIG_BATCH_DIS 0x00000020      /* desc batching disable */
   #define GEM_RX_CONFIG_FBOFF     0x00001c00      /* first byte offset */
   #define GEM_RX_CONFIG_CXM_START 0x000fe000      /* cksum start offset bytes */
   #define GEM_RX_CONFIG_FIFO_THRS 0x07000000      /* fifo threshold size */
   
   #define GEM_THRSH_64    0
   #define GEM_THRSH_128   1
   #define GEM_THRSH_256   2
   #define GEM_THRSH_512   3
   #define GEM_THRSH_1024  4
   #define GEM_THRSH_2048  5
   
   #define GEM_RX_CONFIG_FIFO_THRS_SHIFT   24
   #define GEM_RX_CONFIG_FBOFF_SHFT        10
   #define GEM_RX_CONFIG_CXM_START_SHFT    13
   
   
   /* GEM_RX_PAUSE_THRESH register bits -- sizes in multiples of 64 bytes */
   #define GEM_RX_PTH_XOFF_THRESH  0x000001ff
   #define GEM_RX_PTH_XON_THRESH   0x001ff000
   
   
   /* GEM_RX_BLANKING register bits */
   #define GEM_RX_BLANKING_PACKETS 0x000001ff      /* Delay intr for x packets */
   #define GEM_RX_BLANKING_TIME    0x000ff000      /* Delay intr for x ticks */
   #define GEM_RX_BLANKING_TIME_SHIFT 12
   /* One tick is 2048 PCI clocks, or 16us at 66MHz */
   
   
   /*
    * MAC Programmable Resources
    * Section 3.1.5
    */
   #define GEM_MAC_TXRESET         0x6000          /* TX MAC Software Reset Cmd */
   #define GEM_MAC_RXRESET         0x6004          /* RX MAC Software Reset Cmd */
   /* Note: Store 1, cleared when done for TXRESET and RXRESET */
   #define GEM_MAC_SEND_PAUSE_CMD  0x6008          /* Send Pause Command */
   #define GEM_MAC_TX_STATUS       0x6010          /* TX MAC Status */
   #define GEM_MAC_RX_STATUS       0x6014          /* RX MAC Status */
   #define GEM_MAC_CONTROL_STATUS  0x6018          /* MAC Control Status */
   #define GEM_MAC_TX_MASK         0x6020          /* TX MAC Mask */
   #define GEM_MAC_RX_MASK         0x6024          /* RX MAC Mask */
   #define GEM_MAC_CONTROL_MASK    0x6028          /* MAC Control Mask */
   #define GEM_MAC_TX_CONFIG       0x6030          /* TX MAC Configuration */
   #define GEM_MAC_RX_CONFIG       0x6034          /* XX MAC Configuration */
   #define GEM_MAC_CONTROL_CONFIG  0x6038          /* MAC Control Configuration */
   #define GEM_MAC_XIF_CONFIG      0x603c          /* XIF Configuration */
   #define GEM_MAC_IPG0            0x6040          /* InterPacketGap0 */
   #define GEM_MAC_IPG1            0x6044          /* InterPacketGap1 */
   #define GEM_MAC_IPG2            0x6048          /* InterPacketGap2 */
   #define GEM_MAC_SLOT_TIME       0x604c          /* SlotTime, bits 0-7 */
   #define GEM_MAC_MAC_MIN_FRAME   0x6050          /* MinFrameSize */
   #define GEM_MAC_MAC_MAX_FRAME   0x6054          /* MaxFrameSize */
   #define GEM_MAC_PREAMBLE_LEN    0x6058          /* PA Size */
   #define GEM_MAC_JAM_SIZE        0x605c          /* JamSize */
   #define GEM_MAC_ATTEMPT_LIMIT   0x6060          /* Attempt Limit */
   #define GEM_MAC_CONTROL_TYPE    0x6064          /* MAC Control Type */
   
   #define GEM_MAC_ADDR0           0x6080          /* Normal MAC address 0 */
   #define GEM_MAC_ADDR1           0x6084
   #define GEM_MAC_ADDR2           0x6088
   #define GEM_MAC_ADDR3           0x608c          /* Alternate MAC address 0 */
   #define GEM_MAC_ADDR4           0x6090
   #define GEM_MAC_ADDR5           0x6094
   #define GEM_MAC_ADDR6           0x6098          /* Control MAC address 0 */
   #define GEM_MAC_ADDR7           0x609c
   #define GEM_MAC_ADDR8           0x60a0
   
   #define GEM_MAC_ADDR_FILTER0    0x60a4          /* Address Filter */
   #define GEM_MAC_ADDR_FILTER1    0x60a8
   #define GEM_MAC_ADDR_FILTER2    0x60ac
   #define GEM_MAC_ADR_FLT_MASK1_2 0x60b0          /* Address Filter Mask 2&1 */
   #define GEM_MAC_ADR_FLT_MASK0   0x60b4          /* Address Filter Mask 0 */
   
   #define GEM_MAC_HASH0           0x60c0          /* Hash table 0 */
   #define GEM_MAC_HASH1           0x60c4
   #define GEM_MAC_HASH2           0x60c8
   #define GEM_MAC_HASH3           0x60cc
   #define GEM_MAC_HASH4           0x60d0
   #define GEM_MAC_HASH5           0x60d4
   #define GEM_MAC_HASH6           0x60d8
   #define GEM_MAC_HASH7           0x60dc
   #define GEM_MAC_HASH8           0x60e0
   #define GEM_MAC_HASH9           0x60e4
   #define GEM_MAC_HASH10          0x60e8
   #define GEM_MAC_HASH11          0x60ec
   #define GEM_MAC_HASH12          0x60f0
   #define GEM_MAC_HASH13          0x60f4
   #define GEM_MAC_HASH14          0x60f8
   #define GEM_MAC_HASH15          0x60fc
   
   #define GEM_MAC_NORM_COLL_CNT   0x6100          /* Normal Collision Counter */
   #define GEM_MAC_FIRST_COLL_CNT  0x6104          /* First Attempt Successful
                                                      Collision Counter */
   #define GEM_MAC_EXCESS_COLL_CNT 0x6108          /* Excess Collision Counter */
   #define GEM_MAC_LATE_COLL_CNT   0x610c          /* Late Collision Counter */
   #define GEM_MAC_DEFER_TMR_CNT   0x6110          /* Defer Timer */
   #define GEM_MAC_PEAK_ATTEMPTS   0x6114          /* Peak Attempts */
   #define GEM_MAC_RX_FRAME_COUNT  0x6118          /* Receive Frame Counter */
   #define GEM_MAC_RX_LEN_ERR_CNT  0x611c          /* Length Error Counter */
   #define GEM_MAC_RX_ALIGN_ERR    0x6120          /* Alignment Error Counter */
   #define GEM_MAC_RX_CRC_ERR_CNT  0x6124          /* FCS Error Counter */
   #define GEM_MAC_RX_CODE_VIOL    0x6128          /* RX Code Violation Error
                                                      Counter */
   
   #define GEM_MAC_RANDOM_SEED     0x6130          /* Random Number Seed */
   #define GEM_MAC_MAC_STATE       0x6134          /* State Machine */
   
   
   /*
    * Bits in GEM_MAC_SEND_PAUSE_CMD register
    * Pause time is in units of Slot Times.
    */
   #define GEM_MAC_PAUSE_CMD_TIME  0x0000ffff
   #define GEM_MAC_PAUSE_CMD_SEND  0x00010000
   
   
   /*
    * Bits in GEM_MAC_TX_STATUS and _MASK register
    * Interrupt bits are auto-cleared when the status register is read and
    * the corresponding bit is set in the mask register.
    */
   #define GEM_MAC_TX_XMIT_DONE    0x00000001      /* Successful transmission */
   #define GEM_MAC_TX_UNDERRUN     0x00000002      /* TX "data starvation" */
   #define GEM_MAC_TX_PKT_TOO_LONG 0x00000004      /* Frame exceeds max. length */
   #define GEM_MAC_TX_NCC_EXP      0x00000008      /* Normal collision counter has
                                                      rolled over */
   #define GEM_MAC_TX_ECC_EXP      0x00000010      /* Excessive coll cnt rolled */
   #define GEM_MAC_TX_LCC_EXP      0x00000020      /* Late coll cnt rolled */
   #define GEM_MAC_TX_FCC_EXP      0x00000040      /* First coll cnt rolled */
   #define GEM_MAC_TX_DEFER_EXP    0x00000080      /* Defer timer cnt rolled */
   #define GEM_MAC_TX_PEAK_EXP     0x00000100      /* Peak attempts cnt rolled */
   
   
   /*
    * Bits in GEM_MAC_RX_STATUS and _MASK register
    */
   #define GEM_MAC_RX_DONE         0x00000001      /* Successful reception */
   #define GEM_MAC_RX_OVERFLOW     0x00000002      /* RX resource lack */
   #define GEM_MAC_RX_FRAME_CNT    0x00000004      /* Receive frame counter has
                                                      rolled over */
   #define GEM_MAC_RX_ALIGN_EXP    0x00000008      /* Alignment error cnt rolled */
   #define GEM_MAC_RX_CRC_EXP      0x00000010      /* CRC error cnt rolled */
   #define GEM_MAC_RX_LEN_EXP      0x00000020      /* Length error cnt rolled */
   #define GEM_MAC_RX_CVI_EXP      0x00000040      /* Code violation err rolled */
   
   
   /*
    * Bits in GEM_MAC_CONTROL_STATUS and GEM_MAC_CONTROL_MASK register
    */
   #define GEM_MAC_PAUSED          0x00000001      /* Pause received */
   #define GEM_MAC_PAUSE           0x00000002      /* enter pause state */
   #define GEM_MAC_RESUME          0x00000004      /* exit pause state */
   #define GEM_MAC_PAUSE_TIME      0xffff0000      /* Pause time received */
   #define GEM_MAC_STATUS_BITS     "\177\020b\0PAUSED\0b\1PAUSE\0b\2RESUME\0\0"
   
   
   /*
    * Bits in GEM_MAC_XIF_CONFIG register
    * Default: 0x00
    */
   #define GEM_MAC_XIF_TX_MII_ENA  0x00000001      /* Enable MII output */
   #define GEM_MAC_XIF_MII_LOOPBK  0x00000002      /* Enable (G)MII loopback */
   #define GEM_MAC_XIF_ECHO_DISABL 0x00000004      /* Disable echo */
   #define GEM_MAC_XIF_GMII_MODE   0x00000008      /* Select GMII/MII mode */
   #define GEM_MAC_XIF_MII_BUF_ENA 0x00000010      /* Enable MII recv buffers */
   #define GEM_MAC_XIF_LINK_LED    0x00000020      /* force link LED active */
   #define GEM_MAC_XIF_FDPLX_LED   0x00000040      /* force FDPLX LED active */
   #define GEM_MAC_XIF_BITS        "\177\020b\0TXMIIENA\0b\1MIILOOP\0b\2NOECHO" \
                                   "\0b\3GMII\0b\4MIIBUFENA\0b\5LINKLED\0" \
                                   "b\6FDLED\0\0"
   
   
   /*
    * Bits in GEM_MAC_TX_CONFIG register
    * GEM_MAC_TX_ENABLE must be cleared and a delay imposed before writing to
    * other bits in this register or any of the MAC parameters registers.
    * The GEM_MAC_TX_ENABLE bit will read 0 when the transmitter has stopped.
    * Carrier Extension must be set when operating in Half-Duplex at 1Gbps,
    * and disabled otherwise.  To enable this GEM_MAC_TX_CARR_EXTEND and
    * GEM_MAC_RX_CARR_EXTEND must be set to 1 and the Slot Time register must
    * be set to 0x200.
    */
   #define GEM_MAC_TX_ENABLE       0x00000001      /* TX enable */
   #define GEM_MAC_TX_IGN_CARRIER  0x00000002      /* Ignore carrier sense */
   #define GEM_MAC_TX_IGN_COLLIS   0x00000004      /* ignore collisions */
   #define GEM_MAC_TX_ENA_IPG0     0x00000008      /* extend Rx-to-TX IPG */
   #define GEM_MAC_TX_NGU          0x00000010      /* Never give up */
   #define GEM_MAC_TX_NGU_LIMIT    0x00000020      /* Never give up limit */
   #define GEM_MAC_TX_NO_BACKOFF   0x00000040      /* Never backoff on coll */
   #define GEM_MAC_TX_SLOWDOWN     0x00000080      /* Watch carrier sense */
   #define GEM_MAC_TX_NO_FCS       0x00000100      /* no FCS will be generated */
   #define GEM_MAC_TX_CARR_EXTEND  0x00000200      /* Ena TX Carrier Extension */
   #define GEM_MAC_TX_CONFIG_BITS  "\177\020" \
                                   "b\0TXENA\0b\1IGNCAR\0b\2IGNCOLLIS\0" \
                                   "b\3IPG0ENA\0b\4TXNGU\0b\5TXNGULIM\0" \
                                   "b\6NOBKOFF\0b\7SLOWDN\0b\x8NOFCS\0" \
                                   "b\x9TXCARREXT\0\0"
   
   
   /*
    * Bits in GEM_MAC_RX_CONFIG register
    * The GEM_MAC_RX_ENABLE bit must be cleared and a delay of 3.2ms imposed
    * before writing to other bits in this register or any of the MAC
    * parameters registers.  The GEM_MAC_RX_ENABLE bit will read 0 when the
    * receiver has stopped.
    * The GEM_MAC_RX_HASH_FILTER bit must be cleared and a delay of 3.2ms 
    * imposed before writing to any of the Hash Table registers.  The
    * GEM_MAC_RX_HASH_FILTER bit will read 0 when the registers may be written.
    * The GEM_MAC_RX_ADDR_FILTER bit must be cleared and a delay of 3.2ms
    * imposed before writing to any of the Address Filter registers.  The
    * GEM_MAC_RX_ADDR_FILTER bit will read 0 when the registers may be written.
    * See "Carrier Extension" above.
    */
   #define GEM_MAC_RX_ENABLE       0x00000001      /* RX enable */
   #define GEM_MAC_RX_STRIP_PAD    0x00000002      /* strip pad bytes */
   #define GEM_MAC_RX_STRIP_CRC    0x00000004
   #define GEM_MAC_RX_PROMISCUOUS  0x00000008      /* promiscuous mode */
   #define GEM_MAC_RX_PROMISC_GRP  0x00000010      /* promiscuous group mode */
   #define GEM_MAC_RX_HASH_FILTER  0x00000020      /* enable hash filter */
   #define GEM_MAC_RX_ADDR_FILTER  0x00000040      /* enable address filter */
   #define GEM_MAC_RX_ERRCHK_DIS   0x00000080      /* disable error discard */
   #define GEM_MAC_RX_CARR_EXTEND  0x00000100      /* Ena RX Carrier Extension */
   #define GEM_MAC_RX_CONFIG_BITS  "\177\020" \
                                   "b\0RXENA\0b\1STRPAD\0b\2STRCRC\0" \
                                   "b\3PROMIS\0b\4PROMISCGRP\0b\5HASHFLTR\0" \
                                   "b\6ADDRFLTR\0b\7ERRCHKDIS\0b\x9TXCARREXT\0\0"
   
   
   /*
    * Bits in GEM_MAC_CONTROL_CONFIG
    * Default; 0x0
    */
   #define GEM_MAC_CC_TX_PAUSE     0x00000001      /* send pause enabled */
   #define GEM_MAC_CC_RX_PAUSE     0x00000002      /* receive pause enabled */
   #define GEM_MAC_CC_PASS_PAUSE   0x00000004      /* pass pause up */
   #define GEM_MAC_CC_BITS         "\177\020b\0TXPAUSE\0b\1RXPAUSE\0b\2NOPAUSE\0\0"
   
   
   /* 
    * Bits in GEM_MAC_SLOT_TIME register
    * The slot time is used as PAUSE time unit, value depends on whether carrier
    * extension is enabled.
    */
   #define GEM_MAC_SLOT_TIME_CARR_EXTEND   0x200
   #define GEM_MAC_SLOT_TIME_NORMAL        0x40
   
   
   /*
    * Recommended values for MAC registers:
    *      GEM_MAC_IPG0    0x00
    *      GEM_MAC_IPG1    0x08
    *      GEM_MAC_IPG2    0x04
    *      GEM_MAC_SLOT_TIME       0x40            (see "Carrier Extension" above)
    *   Bits in GEM_MAC_MAC_MAX_FRAME register
    *   max burst size     0x7fff0000
    *   max frame size     0x00007fff
    *      GEM_MAC_MAC_MIN_FRAME   0x40
    *      GEM_MAC_MAC_MAX_FRAME   0x200005ee
    *      GEM_MAC_PREAMBLE_LEN    0x07            (minimum of 0x02)
    *      GEM_MAC_JAM_SIZE        0x04
    *      GEM_MAC_ATTEMPT_LIMIT   0x10
    *      GEM_MAC_CONTROL_TYPE    0x8808
    */
   
   
   /*
    * Address detection and filtering registers (16-bit unless noted):
    *      GEM_MAC_ADDR0           normal priority MAC address bits 32-47
    *      GEM_MAC_ADDR1           normal priority MAC address bits 16-31
    *      GEM_MAC_ADDR2           normal priority MAC address bits 0-15
    *      GEM_MAC_ADDR3           alternate MAC address bits 32-47
    *      GEM_MAC_ADDR4           alternate MAC address bits 16-31
    *      GEM_MAC_ADDR5           alternate MAC address bits 0-15
    *      GEM_MAC_ADDR6           MAC control address bits 32-47
    *      GEM_MAC_ADDR7           MAC control address bits 16-31
    *      GEM_MAC_ADDR8           MAC control address bits 0-15
    *      GEM_MAC_ADDR_FILTER0    address filter bits 32-47
    *      GEM_MAC_ADDR_FILTER1    address filter bits 16-31
    *      GEM_MAC_ADDR_FILTER2    address filter bits 0-15
    *      GEM_MAC_ADR_FLT_MASK1_2 mask for GEM_MAC_ADDR_FILTER1 and 2 (8-bit)
    *      GEM_MAC_ADR_FLT_MASK0   mask for GEM_MAC_ADDR_FILTER0
    *      GEM_MAC_HASH0           hash table bits 240-255
    *      GEM_MAC_HASH1           hash table bits 224-239
    *      GEM_MAC_HASH2           hash table bits 208-223
    *      GEM_MAC_HASH3           hash table bits 192-207
    *      GEM_MAC_HASH4           hash table bits 176-191
    *      GEM_MAC_HASH5           hash table bits 160-175
    *      GEM_MAC_HASH6           hash table bits 144-159
    *      GEM_MAC_HASH7           hash table bits 128-143
    *      GEM_MAC_HASH8           hash table bits 112-127
    *      GEM_MAC_HASH9           hash table bits 96-111
    *      GEM_MAC_HASH10          hash table bits 80-95
    *      GEM_MAC_HASH11          hash table bits 64-79
    *      GEM_MAC_HASH12          hash table bits 48-63
    *      GEM_MAC_HASH13          hash table bits 32-47
    *      GEM_MAC_HASH14          hash table bits 16-31
    *      GEM_MAC_HASH15          hash table bits 0-15
    */
    
   /*
    * Recommended values for statistic registers:
    *      GEM_MAC_NORM_COLL_CNT   0x0000
    *      GEM_MAC_FIRST_COLL_CNT  0x0000
    *      GEM_MAC_EXCESS_COLL_CNT 0x0000
    *      GEM_MAC_LATE_COLL_CNT   0x0000
    *      GEM_MAC_DEFER_TMR_CNT   0x0000
    *      GEM_MAC_PEAK_ATTEMPTS   0x0000
    *      GEM_MAC_RX_FRAME_COUNT  0x0000
    *      GEM_MAC_RX_LEN_ERR_CNT  0x0000
    *      GEM_MAC_RX_ALIGN_ERR    0x0000
    *      GEM_MAC_RX_CRC_ERR_CNT  0x0000
    *      GEM_MAC_RX_CODE_VIOL    0x0000
    */
                   
   
   /*
    * MIF Programmable Resources
    * Section 3.1.5.8
    * Bit-bang registers use low bit only
    */
   #define GEM_MIF_BB_CLOCK        0x6200          /* MIF Bit-Bang Clock */
   #define GEM_MIF_BB_DATA         0x6204          /* MIF Bit-Bang Data */
   #define GEM_MIF_BB_OUTPUT_ENAB  0x6208          /* MIF Bit-Bang Output Enable */
   #define GEM_MIF_FRAME           0x620c          /* MIF Frame/Output */
   #define GEM_MIF_CONFIG          0x6210          /* MIF Configuration */
   #define GEM_MIF_INTERRUPT_MASK  0x6214          /* MIF Mask */
   #define GEM_MIF_BASIC_STATUS    0x6218          /* MIF Status */
   #define GEM_MIF_STATE_MACHINE   0x621c          /* MIF State Machine */
   
   
   /*
    * Bits in GEM_MIF_FRAME register
    */
   #define GEM_MIF_FRAME_DATA      0x0000ffff      /* Instruction payload */
   #define GEM_MIF_FRAME_TA0       0x00010000      /* TA bit, 1 for completion */
   #define GEM_MIF_FRAME_TA1       0x00020000      /* TA bits */
   #define GEM_MIF_FRAME_REG_ADDR  0x007c0000      /* Register address */
   #define GEM_MIF_FRAME_PHY_ADDR  0x0f800000      /* PHY address, should be 0 */
   #define GEM_MIF_FRAME_OP        0x30000000      /* operation - write/read */
   #define GEM_MIF_FRAME_START     0xc0000000      /* START bits */
   
   #define GEM_MIF_FRAME_READ      0x60020000
   #define GEM_MIF_FRAME_WRITE     0x50020000
   
   #define GEM_MIF_REG_SHIFT       18
   #define GEM_MIF_PHY_SHIFT       23
   
   
   /*
    * Bits in GEM_MIF_CONFIG register
    */
   #define GEM_MIF_CONFIG_PHY_SEL  0x00000001      /* PHY select, 0=MDIO_0 */
   #define GEM_MIF_CONFIG_POLL_ENA 0x00000002      /* poll enable */
   #define GEM_MIF_CONFIG_BB_ENA   0x00000004      /* bit bang enable */
   #define GEM_MIF_CONFIG_REG_ADR  0x000000f8      /* poll register address */
   #define GEM_MIF_CONFIG_MDI0     0x00000100      /* MDIO_0 B-B data/attached */
   #define GEM_MIF_CONFIG_MDI1     0x00000200      /* MDIO_1 B-B data/attached */
   #define GEM_MIF_CONFIG_PHY_ADR  0x00007c00      /* poll PHY address */
   /* MDIO_0 is onboard transceiver MDIO_1 is external, PHY addr for both is 0 */
   #define GEM_MIF_CONFIG_BITS     "\177\020b\0PHYSEL\0b\1POLL\0b\2BBENA\0" \
                                   "b\x8MDIO0\0b\x9MDIO1\0\0"
   
   
   /*
    * Bits in GEM_MIF_BASIC_STATUS and GEM_MIF_INTERRUPT_MASK
    * The Basic part is the last value read in the POLL field of the config
    * register.
    * The status part indicates the bits that have changed.
    */
   #define GEM_MIF_STATUS          0x0000ffff
   #define GEM_MIF_BASIC           0xffff0000
   
   
   /*
    * PCS/Serialink Registers
    * Section 3.1.6
    * DO NOT TOUCH THESE REGISTERS ON ERI -- IT HARD HANGS.
    */
   #define GEM_MII_CONTROL         0x9000          /* PCS MII Control */
   #define GEM_MII_STATUS          0x9004          /* PCS MII Status */
   #define GEM_MII_ANAR            0x9008          /* PCS MII Advertisement */
   #define GEM_MII_ANLPAR          0x900c          /* PCS MII Link Partner
                                                      Ability */
   #define GEM_MII_CONFIG          0x9010          /* PCS Configuration */
   #define GEM_MII_STATE_MACHINE   0x9014          /* PCS State Machine */
   #define GEM_MII_INTERRUP_STATUS 0x9018          /* PCS Interrupt Status */
   #define GEM_MII_DATAPATH_MODE   0x9050          /* Datapath Mode Register */
   #define GEM_MII_SLINK_CONTROL   0x9054          /* Serialink Control */
   #define GEM_MII_OUTPUT_SELECT   0x9058          /* Share Output Select */
   #define GEM_MII_SLINK_STATUS    0x905c          /* Serialink Status */
   
   
   /*
    * Bits in GEM_MII_CONTROL register
    * PCS "BMCR" (Basic Mode Control Reg)
    * Default: 0x1040
    * AUTONEG and RESET self clear when relevant process is completed.
    */
   #define GEM_MII_1GB_SPEED_SEL   0x00000040      /* 1000Mb/s, always 1 */
   #define GEM_MII_CONTROL_COL_TST 0x00000080      /* collision test */
   #define GEM_MII_CONTROL_FDUPLEX 0x00000100      /* full duplex, always 0 */
   #define GEM_MII_CONTROL_RAN     0x00000200      /* restart auto negotiation */
   #define GEM_MII_CONTROL_ISOLATE 0x00000400      /* isolate PHY, ignored */
   #define GEM_MII_CONTROL_POWERDN 0x00000800      /* power down, ignored */
   #define GEM_MII_CONTROL_AUTONEG 0x00001000      /* auto negotiation enabled */
   #define GEM_MII_CONTROL_SPEED   0x00002000      /* speed select, ignored */
   #define GEM_MII_CONTROL_LOOPBK  0x00004000      /* Serialink loopback */
   #define GEM_MII_CONTROL_RESET   0x00008000      /* Reset PCS */
   #define GEM_MII_CONTROL_BITS    "\177\020b\7COLTST\0b\x8_FD\0b\x9RAN\0" \
                                   "b\xaISOLATE\0b\xbPWRDWN\0b\xc_ANEG\0" \
                                   "b\xdGIGE\0b\xeLOOP\0b\xfRESET\0\0"
   
   
   /*
    * Bits in GEM_MII_STATUS register.
    * PCS "BMSR" (Basic Mode Status Reg)
    * Default: 0x0108
    */
   #define GEM_MII_STATUS_EXTCAP   0x00000001      /* extended capability, always 0 */
   #define GEM_MII_STATUS_JABBER   0x00000002      /* jabber detected, always 0 */
   #define GEM_MII_STATUS_LINK_STS 0x00000004      /* link status, 1=up */
   #define GEM_MII_STATUS_ACFG     0x00000008      /* can auto neg, always 1 */
   #define GEM_MII_STATUS_REM_FLT  0x00000010      /* remote fault detected */
   #define GEM_MII_STATUS_ANEG_CPT 0x00000020      /* auto negotiate complete */
   #define GEM_MII_STATUS_EXT_STS  0x00000100      /* Is 1000Base-X, always 1 */
   #define GEM_MII_STATUS_GB_HDX   0x00000200      /* can perform GBit HDX */
   #define GEM_MII_STATUS_GB_FDX   0x00000400      /* can perform GBit FDX */
   #define GEM_MII_STATUS_BITS     "\177\020b\0EXTCAP\0b\1JABBER\0b\2LINKSTS\0" \
                                   "b\3ACFG\0b\4REMFLT\0b\5ANEGCPT\0b\x9GBHDX\0" \
                                   "b\xaGBFDX\0\0"
   
   
   /*
    * Bits in GEM_MII_ANAR and GEM_MII_ANLPAR registers
    * GEM_MII_ANAR contains our capabilities for auto- negotiation
    * (Default: 0x00e0) and GEM_MII_ANLPAR contains the link partners
    * abilities and is only valid after auto-negotiation completes.
    */
   #define GEM_MII_ANEG_FUL_DUPLX  0x00000020      /* can do 1000Base-X FDX */
   #define GEM_MII_ANEG_HLF_DUPLX  0x00000040      /* can do 1000Base-X HDX */
   #define GEM_MII_ANEG_SYM_PAUSE  0x00000080      /* can do symmetric pause */
   #define GEM_MII_ANEG_ASYM_PAUSE 0x00000100      /* can do asymmetric pause */
   #define GEM_MII_ANEG_RF         0x00003000      /* advertise remote fault */
   #define GEM_MII_ANEG_ACK        0x00004000      /* ack reception of
                                                      Link Partner Capability */
   #define GEM_MII_ANEG_NP         0x00008000      /* next page bit, always 0 */
   #define GEM_MII_ANEG_BITS       "\177\020b\5FDX\0b\6HDX\0b\7SYMPAUSE\0" \
                                   "\b\x8_ASYMPAUSE\0\b\xdREMFLT\0\b\xeLPACK\0" \
                                   "\b\xfNPBIT\0\0"
   
   
   /*
    * Bits in GEM_MII_CONFIG register
    * Default: 0x0
    * GEM_MII_CONFIG_ENABLE must be 0 when modifiying the GEM_MII_ANAR
    * register.  To isolate the MC from the media, set this bit to 0 and
    * restart auto-negotiation in GEM_MII_CONTROL.
    */
   #define GEM_MII_CONFIG_ENABLE   0x00000001      /* Enable PCS */
   #define GEM_MII_CONFIG_SDO      0x00000002      /* Signal Detect Override */
   #define GEM_MII_CONFIG_SDL      0x00000004      /* Signal Detect active low */
   #define GEM_MII_CONFIG_TIMER    0x0000000e      /* link monitor timer values */
   #define GEM_MII_CONFIG_JS       0x00000018      /* Jitter Study, 0 normal
                                                    * 1 high freq, 2 low freq */
   #define GEM_MII_CONFIG_ANTO     0x00000020      /* 10ms ANEG timer override */
   #define GEM_MII_CONFIG_BITS     "\177\020b\0PCSENA\0\0"
   
   
   /*
    * Bits in GEM_MII_STATE_MACHINE register
    * XXX These are best guesses from observed behavior.
    */
   #define GEM_MII_FSM_STOP        0x00000000      /* stopped */
   #define GEM_MII_FSM_RUN         0x00000001      /* running */
   #define GEM_MII_FSM_UNKWN       0x00000100      /* unknown */
   #define GEM_MII_FSM_DONE        0x00000101      /* complete */
   
   
   /*
    * Bits in GEM_MII_INTERRUP_STATUS register
    * No mask register; mask with the global interrupt mask register.
    */
   #define GEM_MII_INTERRUP_LINK   0x00000004      /* PCS link status change */
   
   
   /*
    * Bits in GEM_MII_DATAPATH_MODE register
    * Default: none
    */
   #define GEM_MII_DATAPATH_SERIAL 0x00000001      /* Use internal Serialink */
   #define GEM_MII_DATAPATH_SERDES 0x00000002      /* Use PCS via 10bit interfac */
   #define GEM_MII_DATAPATH_MII    0x00000004      /* Use {G}MII, not PCS */
   #define GEM_MII_DATAPATH_MIIOUT 0x00000008      /* Set serial output on GMII */
   #define GEM_MII_DATAPATH_BITS   "\177\020"                              \
                                   "b\0SERIAL\0b\1SERDES\0b\2MII\0b\3MIIOUT\0\0"
   
   
   /*
    * Bits in GEM_MII_SLINK_CONTROL register
    * Default: 0x000
    */
   #define GEM_MII_SLINK_LOOPBACK  0x00000001      /* enable loopback on Serialink
                                                      disable loopback on SERDES */
   #define GEM_MII_SLINK_EN_SYNC_D 0x00000002      /* enable sync detection */
   #define GEM_MII_SLINK_LOCK_REF  0x00000004      /* lock reference clock */
   #define GEM_MII_SLINK_EMPHASIS  0x00000018      /* enable emphasis */
   #define GEM_MII_SLINK_SELFTEST  0x000001c0
   #define GEM_MII_SLINK_POWER_OFF 0x00000200      /* Power down Serialink block */
   #define GEM_MII_SLINK_RX_ZERO   0x00000c00      /* PLL input to Serialink */
   #define GEM_MII_SLINK_RX_POLL   0x00003000      /* PLL input to Serialink */
   #define GEM_MII_SLINK_TX_ZERO   0x0000c000      /* PLL input to Serialink */
   #define GEM_MII_SLINK_TX_POLL   0x00030000      /* PLL input to Serialink */
   #define GEM_MII_SLINK_CONTROL_BITS                                      \
                                   "\177\020b\0LOOP\0b\1ENASYNC\0b\2LOCKREF" \
                                   "\0b\3EMPHASIS1\0b\4EMPHASIS2\0b\x9PWRDWN\0\0"
   
   
   /*
    * Bits in GEM_MII_OUTPUT_SELECT register
    * Default: 0x0
    */
   #define GEM_MII_PROM_ADDR       0x00000003      /* Test output multiplexor */
   
   
   /*
    * Bits in GEM_MII_SLINK_STATUS register
    * Default: 0x0
    */
   #define GEM_MII_SLINK_TEST      0x00000000      /* undergoing test */
   #define GEM_MII_SLINK_LOCKED    0x00000001      /* waiting 500us lockrefn */
   #define GEM_MII_SLINK_COMMA     0x00000002      /* waiting for comma detect */
   #define GEM_MII_SLINK_SYNC      0x00000003      /* recv data synchronized */
   
   
   /*
    * PCI Expansion ROM runtime access
    * Sun GEMs map a 1MB space for the PCI Expansion ROM as the second half
    * of the first register bank, although they only support up to 64KB ROMs.
    */
   #define GEM_PCI_ROM_OFFSET      0x100000
   #define GEM_PCI_ROM_SIZE        0x10000
   
   
   /* Wired GEM PHY addresses */
   #define GEM_PHYAD_INTERNAL      1
   #define GEM_PHYAD_EXTERNAL      0
   
   /*
    * GEM descriptor table structures.
    */
   struct gem_desc {
           uint64_t        gd_flags;
           uint64_t        gd_addr;
   };
   
   /* Transmit flags */
   #define GEM_TD_BUFSIZE          0x0000000000007fffLL
   #define GEM_TD_CXSUM_START      0x00000000001f8000LL    /* Cxsum start offset */
   #define GEM_TD_CXSUM_STARTSHFT  15
   #define GEM_TD_CXSUM_STUFF      0x000000001fe00000LL    /* Cxsum stuff offset */
   #define GEM_TD_CXSUM_STUFFSHFT  21
   #define GEM_TD_CXSUM_ENABLE     0x0000000020000000LL    /* Cxsum generation enable */
   #define GEM_TD_END_OF_PACKET    0x0000000040000000LL
   #define GEM_TD_START_OF_PACKET  0x0000000080000000LL
   #define GEM_TD_INTERRUPT_ME     0x0000000100000000LL    /* Interrupt me now */
   #define GEM_TD_NO_CRC           0x0000000200000000LL    /* do not insert crc */
   /*
    * Only need to set GEM_TD_CXSUM_ENABLE, GEM_TD_CXSUM_STUFF,
    * GEM_TD_CXSUM_START, and GEM_TD_INTERRUPT_ME in 1st descriptor of a group.
    */
   
   /* Receive flags */
   #define GEM_RD_CHECKSUM         0x000000000000ffffLL    /* is the complement */
   #define GEM_RD_BUFSIZE          0x000000007fff0000LL
   #define GEM_RD_OWN              0x0000000080000000LL    /* 1 - owned by h/w */
   #define GEM_RD_HASHVAL          0x0ffff00000000000LL
   #define GEM_RD_HASH_PASS        0x1000000000000000LL    /* passed hash filter */
   #define GEM_RD_ALTERNATE_MAC    0x2000000000000000LL    /* Alternate MAC adrs */
   #define GEM_RD_BAD_CRC          0x4000000000000000LL
   
   #define GEM_RD_BUFSHIFT         16
   #define GEM_RD_BUFLEN(x)        (((x)&GEM_RD_BUFSIZE)>>GEM_RD_BUFSHIFT)
   
   #endif

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