57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/*
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* Constants etc. for the Bochs/Etherboot pseudo-NIC
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*
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* This header file must be valid C and C++.
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*
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* Operation of the pseudo-NIC (PNIC) is pretty simple. To write a
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* command plus data, first write the length of the data to
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* PNIC_REG_LEN, then write the data a byte at a type to
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* PNIC_REG_DATA, then write the command code to PNIC_REG_CMD. The
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* status will be available from PNIC_REG_STAT. The length of any
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* data returned will be in PNIC_REG_LEN and can be read a byte at a
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* time from PNIC_REG_DATA.
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*/
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/*
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* PCI parameters
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*/
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#define PNIC_PCI_VENDOR 0xfefe /* Hopefully these won't clash with */
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#define PNIC_PCI_DEVICE 0xefef /* any real PCI device IDs. */
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/*
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* 'Hardware' register addresses, offset from io_base
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*/
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#define PNIC_REG_CMD 0x00 /* Command register, 2 bytes, write only */
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#define PNIC_REG_STAT 0x00 /* Status register, 2 bytes, read only */
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#define PNIC_REG_LEN 0x02 /* Length register, 2 bytes, read-write */
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#define PNIC_REG_DATA 0x04 /* Data port, 1 byte, read-write */
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/*
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* PNIC_MAX_REG used in Bochs to claim i/o space
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*/
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#define PNIC_MAX_REG 0x04
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/*
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* Command code definitions: write these into PNIC_REG_CMD
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*/
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#define PNIC_CMD_NOOP 0x0000
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#define PNIC_CMD_API_VER 0x0001
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#define PNIC_CMD_READ_MAC 0x0002
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#define PNIC_CMD_RESET 0x0003
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#define PNIC_CMD_XMIT 0x0004
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#define PNIC_CMD_RECV 0x0005
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/*
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* Status code definitions: read these from PNIC_REG_STAT
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*
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* We avoid using status codes that might be confused with
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* randomly-read data (e.g. 0x0000, 0xffff etc.)
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*/
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#define PNIC_STATUS_OK 0x4f4b /* 'OK' */
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#define PNIC_STATUS_UNKNOWN_CMD 0x3f3f /* '??' */
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/*
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* Other miscellaneous information
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*/
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#define PNIC_API_VERSION 0x0100 /* 1.0 */
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