Annotation of sys/arch/mvme88k/stand/netboot/if_iereg.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: if_iereg.h,v 1.2 1998/08/22 08:38:01 smurph Exp $ */
! 2:
! 3: /*
! 4: * if_sunie.h
! 5: *
! 6: * sun's ie interface
! 7: */
! 8:
! 9: /*
! 10: * programming notes:
! 11: *
! 12: * the ie chip operates in a 24 bit address space.
! 13: *
! 14: * most ie interfaces appear to be divided into two parts:
! 15: * - generic 586 stuff
! 16: * - board specific
! 17: *
! 18: * generic:
! 19: * the generic stuff of the ie chip is all done with data structures
! 20: * that live in the chip's memory address space. the chip expects
! 21: * its main data structure (the sys conf ptr -- SCP) to be at a fixed
! 22: * address in its 24 bit space: 0xfffff4
! 23: *
! 24: * the SCP points to another structure called the ISCP.
! 25: * the ISCP points to another structure called the SCB.
! 26: * the SCB has a status field, a linked list of "commands", and
! 27: * a linked list of "receive buffers". these are data structures that
! 28: * live in memory, not registers.
! 29: *
! 30: * board:
! 31: * to get the chip to do anything, you first put a command in the
! 32: * command data structure list. then you have to signal "attention"
! 33: * to the chip to get it to look at the command. how you
! 34: * signal attention depends on what board you have... on PC's
! 35: * there is an i/o port number to do this, on sun's there is a
! 36: * register bit you toggle.
! 37: *
! 38: * to get data from the chip you program it to interrupt...
! 39: *
! 40: *
! 41: * sun issues:
! 42: *
! 43: * there are 3 kinds of sun "ie" interfaces:
! 44: * 1 - a VME/multibus card
! 45: * 2 - an on-board interface (sun3's, sun-4/100's, and sun-4/200's)
! 46: * 3 - another VME board called the 3E
! 47: *
! 48: * the VME boards lives in vme16 space. only 16 and 8 bit accesses
! 49: * are allowed, so functions that copy data must be aware of this.
! 50: *
! 51: * the chip is an intel chip. this means that the byte order
! 52: * on all the "short"s in the chip's data structures is wrong.
! 53: * so, constants described in the intel docs are swapped for the sun.
! 54: * that means that any buffer pointers you give the chip must be
! 55: * swapped to intel format. yuck.
! 56: *
! 57: * VME/multibus interface:
! 58: * for the multibus interface the board ignores the top 4 bits
! 59: * of the chip address. the multibus interface seems to have its
! 60: * own MMU like page map (without protections or valid bits, etc).
! 61: * there are 256 pages of physical memory on the board (each page
! 62: * is 1024 bytes). there are 1024 slots in the page map. so,
! 63: * a 1024 byte page takes up 10 bits of address for the offset,
! 64: * and if there are 1024 slots in the page that is another 10 bits
! 65: * of the address. that makes a 20 bit address, and as stated
! 66: * earlier the board ignores the top 4 bits, so that accounts
! 67: * for all 24 bits of address.
! 68: *
! 69: * note that the last entry of the page map maps the top of the
! 70: * 24 bit address space and that the SCP is supposed to be at
! 71: * 0xfffff4 (taking into account allignment). so,
! 72: * for multibus, that entry in the page map has to be used for the SCP.
! 73: *
! 74: * the page map effects BOTH how the ie chip sees the
! 75: * memory, and how the host sees it.
! 76: *
! 77: * the page map is part of the "register" area of the board
! 78: *
! 79: * on-board interface:
! 80: *
! 81: * <fill in useful info later>
! 82: *
! 83: *
! 84: * VME3E interface:
! 85: *
! 86: * <fill in useful info later>
! 87: *
! 88: */
! 89:
! 90: /*
! 91: * PART 1: VME/multibus defs
! 92: */
! 93: #define IEVME_PAGESIZE 1024 /* bytes */
! 94: #define IEVME_PAGSHIFT 10 /* bits */
! 95: #define IEVME_NPAGES 256 /* number of pages on chip */
! 96: #define IEVME_MAPSZ 1024 /* number of entries in the map */
! 97:
! 98: /*
! 99: * PTE for the page map
! 100: */
! 101: #define IEVME_SBORDR 0x8000 /* sun byte order */
! 102: #define IEVME_IBORDR 0x0000 /* intel byte ordr */
! 103:
! 104: #define IEVME_P2MEM 0x2000 /* memory is on P2 */
! 105: #define IEVME_OBMEM 0x0000 /* memory is on board */
! 106:
! 107: #define IEVME_PGMASK 0x0fff /* gives the physical page frame number */
! 108:
! 109: struct ievme {
! 110: u_short pgmap[IEVME_MAPSZ];
! 111: u_short xxx[32]; /* prom */
! 112: u_short status; /* see below for bits */
! 113: u_short xxx2; /* filler */
! 114: u_short pectrl; /* parity control (see below) */
! 115: u_short peaddr; /* low 16 bits of address */
! 116: };
! 117: /*
! 118: * status bits
! 119: */
! 120: #define IEVME_RESET 0x8000 /* reset board */
! 121: #define IEVME_ONAIR 0x4000 /* go out of loopback 'on-air' */
! 122: #define IEVME_ATTEN 0x2000 /* attention */
! 123: #define IEVME_IENAB 0x1000 /* interrupt enable */
! 124: #define IEVME_PEINT 0x0800 /* parity error interrupt enable */
! 125: #define IEVME_PERR 0x0200 /* parity error flag */
! 126: #define IEVME_INT 0x0100 /* interrupt flag */
! 127: #define IEVME_P2EN 0x0020 /* enable p2 bus */
! 128: #define IEVME_256K 0x0010 /* 256kb rams */
! 129: #define IEVME_HADDR 0x000f /* mask for bits 17-20 of address */
! 130:
! 131: /*
! 132: * parity control
! 133: */
! 134: #define IEVME_PARACK 0x0100 /* parity error ack */
! 135: #define IEVME_PARSRC 0x0080 /* parity error source */
! 136: #define IEVME_PAREND 0x0040 /* which end of the data got the error */
! 137: #define IEVME_PARADR 0x000f /* mask to get bits 17-20 of parity address */
! 138:
! 139:
! 140: /*
! 141: * PART 2: the on-board interface
! 142: */
! 143: struct ieob {
! 144: u_char obctrl;
! 145: };
! 146: #define IEOB_NORSET 0x80 /* don't reset the board */
! 147: #define IEOB_ONAIR 0x40 /* put us on the air */
! 148: #define IEOB_ATTEN 0x20 /* attention! */
! 149: #define IEOB_IENAB 0x10 /* interrupt enable */
! 150: #define IEOB_XXXXX 0x08 /* free bit */
! 151: #define IEOB_XCVRL2 0x04 /* level 2 transceiver? */
! 152: #define IEOB_BUSERR 0x02 /* bus error */
! 153: #define IEOB_INT 0x01 /* interrupt */
! 154:
! 155: #define IEOB_ADBASE 0xff000000 /* KVA base addr of 24 bit address space */
! 156:
! 157: /*
! 158: * PART 3: the 3E board
! 159: */
! 160:
! 161: /*
! 162: * not supported (yet?)
! 163: */
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