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/*
* Constants etc. for the Bochs/Etherboot pseudo-NIC
*
* This header file must be valid C and C++.
*
* Operation of the pseudo-NIC (PNIC) is pretty simple. To write a
* command plus data, first write the length of the data to
* PNIC_REG_LEN, then write the data a byte at a type to
* PNIC_REG_DATA, then write the command code to PNIC_REG_CMD. The
* status will be available from PNIC_REG_STAT. The length of any
* data returned will be in PNIC_REG_LEN and can be read a byte at a
* time from PNIC_REG_DATA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
/*
* PCI parameters
*/
#define PNIC_PCI_VENDOR 0xfefe /* Hopefully these won't clash with */
#define PNIC_PCI_DEVICE 0xefef /* any real PCI device IDs. */
/*
* 'Hardware' register addresses, offset from io_base
*/
#define PNIC_REG_CMD 0x00 /* Command register, 2 bytes, write only */
#define PNIC_REG_STAT 0x00 /* Status register, 2 bytes, read only */
#define PNIC_REG_LEN 0x02 /* Length register, 2 bytes, read-write */
#define PNIC_REG_DATA 0x04 /* Data port, 1 byte, read-write */
/*
* PNIC_MAX_REG used in Bochs to claim i/o space
*/
#define PNIC_MAX_REG 0x04
/*
* Command code definitions: write these into PNIC_REG_CMD
*/
#define PNIC_CMD_NOOP 0x0000
#define PNIC_CMD_API_VER 0x0001
#define PNIC_CMD_READ_MAC 0x0002
#define PNIC_CMD_RESET 0x0003
#define PNIC_CMD_XMIT 0x0004
#define PNIC_CMD_RECV 0x0005
#define PNIC_CMD_RECV_QLEN 0x0006
#define PNIC_CMD_MASK_IRQ 0x0007
#define PNIC_CMD_FORCE_IRQ 0x0008
/*
* Status code definitions: read these from PNIC_REG_STAT
*
* We avoid using status codes that might be confused with
* randomly-read data (e.g. 0x0000, 0xffff etc.)
*/
#define PNIC_STATUS_OK 0x4f4b /* 'OK' */
#define PNIC_STATUS_UNKNOWN_CMD 0x3f3f /* '??' */
/*
* Other miscellaneous information
*/
#define PNIC_API_VERSION 0x0101 /* 1.1 */
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