MINIX2.0操作系统源码.rar

/* * This file contains the device dependent part of an experimental disk * and tape driver for the Adaptec 154x SCSI Host Adapter family, written * by James da Silva (jds@cs.umd.edu). * * I wrote this driver using the technical documentation for the AHA available * from the Adaptec BBS at 1-408-945-7727, and from the SCSI standard drafts * available on NCR's SCSI BBS at 1-316-636-8700. I suggest you get both * these documents if you want to understand and hack this code. * * This code has been extensively modified by Kees J. Bot (kjb@cs.vu.nl) to * a point that James will barely recognize it as his. It is completely * remodeled and doubled in both size and functionality. It is no longer * considered experimental either. * * The supported device numbers are as follows: * # Name Device * 0 sd0 disk 0, entire disk * 1 sd1 disk 0, partition 1 * 2 sd2 disk 0, partition 2 * 3 sd3 disk 0, partition 3 * 4 sd4 disk 0, partition 4 * 5 sd5 disk 1, entire disk * 6 sd6 disk 1, partition 1 * .. .... .... * 39 sd39 disk 7, partition 4 * * 64 nrst0 tape 0, no rewind * 65 rst0 tape 0, rewind * 66 nrst1 tape 1, no rewind * .. .... .... * 79 rst7 tape 7, rewind * * 128 sd1a disk 0, partition 1, subpartition 1 * 129 sd1b disk 0, partition 1, subpartition 2 * ... .... .... * 255 sd39d disk 7, partition 4, subpartition 4 * * The translation of device numbers to targets and logical units is very * simple: The target is the same as the disk or tape number, the logical * unit is always zero. Devices with logical unit numbers other then zero * are virtually extinct. If you happen to have such a dinosaur device, * then you can reprogram (e.g.) sd35 and st7 to target 0, lun 1 from the * Boot Monitor with 'sd35=0,1'. * * * The file contains one entry point: * * aha_scsi_task: main entry when system is brought up * * * Changes: * 5 May 1992 by Kees J. Bot: device dependent/independent split. * 7 Jul 1992 by Kees J. Bot: speedup & features. * 28 Dec 1992 by Kees J. Bot: completely remodeled & virtual memory. * 18 Sep 1994 by Kees J. Bot: removed "send 2 commands at once" junk. */ #include "kernel.h" #include "driver.h" #include "drvlib.h" #if ENABLE_ADAPTEC_SCSI #include <fcntl.h> #include <sys/ioctl.h> #include <sys/mtio.h> #include "assert.h" INIT_ASSERT #ifndef AHA_DEBUG #define AHA_DEBUG 0 /* 1=print all SCSI errors | 2=dump ccb * 4=show request | 8=dump scsi cmd */ #endif /* AHA-154x port addresses */ #define AHA_BASEREG 0x330 /* default base port address of AHA registers */ #define AHA_CNTLREG aha_basereg+0 /* Control Register - write only */ #define AHA_STATREG aha_basereg+0 /* Status Register - read only */ #define AHA_DATAREG aha_basereg+1 /* Data Register - read/write */ #define AHA_INTRREG aha_basereg+2 /* Interrupt Flags - read only */ /* control register bits */ #define AHA_HRST 0x80 /* bit 7 - Hard Reset */ #define AHA_SRST 0x40 /* bit 6 - Soft Reset */ #define AHA_IRST 0x20 /* bit 5 - Interrupt Reset */ #define AHA_SCRST 0x10 /* bit 4 - SCSI Bus Reset */ /* 0x08 * bit 3 - Reserved (set to 0) */ /* 0x04 * bit 2 - Reserved (set to 0) */ /* 0x02 * bit 1 - Reserved (set to 0) */ /* 0x01 * bit 0 - Reserved (set to 0) */ /* status register bits */ #define AHA_STST 0x80 /* bit 7 - Self Test in Progress */ #define AHA_DIAGF 0x40 /* bit 6 - Internal Diagnostic Failure */ #define AHA_INIT 0x20 /* bit 5 - Mailbox Initialization Required */ #define AHA_IDLE 0x10 /* bit 4 - SCSI Host Adapter Idle */ #define AHA_CDF 0x08 /* bit 3 - Command/Data Out Port Full */ #define AHA_DF 0x04 /* bit 2 - Data In Port Full */ /* 0x02 * bit 1 - Reserved */ #define AHA_INVDCMD 0x01 /* bit 0 - Invalid Host Adapter Command */ /* interrupt flags register bits */ #define AHA_ANYINT 0x80 /* bit 7 - Any Interrupt */ /* 0x40 * bit 6 - Reserved */ /* 0x20 * bit 5 - Reserved */ /* 0x10 * bit 4 - Reserved */ #define AHA_SCRD 0x08 /* bit 3 - SCSI Reset Detected */ #define AHA_HACC 0x04 /* bit 2 - Host Adapter Command Complete */ #define AHA_MBOE 0x02 /* bit 1 - Mailbox Out Empty */ #define AHA_MBIF 0x01 /* bit 0 - Mailbox In Full */ /* AHA board models */ #define AHA1540 0x30 #define AHA1540A 0x41 #define AHA1640 0x42 #define AHA1740 0x43 #define AHA1540C 0x44 #define AHA1540CF 0x45 #define BT545 0x20 /* BusLogic */ /* AHA Command Codes */ #define AHACOM_INITBOX 0x01 /* Mailbox Initialization */ #define AHACOM_STARTSCSI 0x02 /* Start SCSI Command */ #define AHACOM_HAINQUIRY 0x04 /* Host Adapter Inquiry */ #define AHACOM_SETIMEOUT 0x06 /* Set SCSI selection time out value */ #define AHACOM_BUSON 0x07 /* Set DMA bus on time */ #define AHACOM_BUSOFF 0x08 /* Set DMA bus off time */ #define AHACOM_SPEED 0x09 /* Set DMA transfer speed */ #define AHACOM_INSTALLED 0x0A /* Return Installed Devices */ #define AHACOM_GETCONFIG 0x0B /* Return Configuration Data */ #define AHACOM_GETSETUP 0x0D /* Return Setup Data */ #define AHACOM_EXTBIOS 0x28 /* Return Extended BIOS Info */ #define AHACOM_MBOX_ENABLE 0x29 /* Enable Mailbox Interface */ /* AHA Mailbox Out Codes */ #define AHA_MBOXFREE 0x00 /* Mailbox is Free */ #define AHA_MBOXSTART 0x01 /* Start Command */ #define AHA_MBOXABORT 0x02 /* Abort Command */ /* AHA Mailbox In Codes */ #define AHA_MBOXOK 0x01 /* Command Completed Successfully */ #define AHA_MBOXERR 0x04 /* Command Completed with Error */ /* Basic types */ typedef unsigned char byte; typedef byte big16[2]; /* 16 bit big-endian values */ typedef byte big24[3]; /* AHA uses 24 bit, big-endian values! */ typedef byte big32[4]; /* Group 1 SCSI commands use 32 bit big-endian values */ /* AHA Mailbox structure */ typedef struct { byte status; /* Command or Status byte */ big24 ccbptr; /* pointer to Command Control Block */ } mailbox_t; /* SCSI Group 0 Command Descriptor Block structure */ typedef union { struct { /* Disk i/o commands */ byte d_scsi_op; /* SCSI Operation Code */ # define SCSI_UNITRDY 0x00 /* Test Unit Ready */ # define SCSI_REWIND 0x01 /* Rewind */ # define SCSI_REQSENSE 0x03 /* Request sense */ # define SCSI_RDLIMITS 0x05 /* Read Block Limits Opcode */ # define SCSI_READ 0x08 /* Group 0 Read Opcode */ # define SCSI_WRITE 0x0A /* Group 0 Write Opcode */ # define SCSI_WREOF 0x10 /* Write File Marks */ # define SCSI_SPACE 0x11 /* Space over filemarks/blocks */ # define SCSI_INQUIRY 0x12 /* Group 0 Inquiry Opcode */ # define SCSI_MDSELECT 0x15 /* Group 0 Mode Select Opcode */ # define SCSI_ERASE 0x19 /* Erase Tape */ # define SCSI_MDSENSE 0x1A /* Group 0 Mode Sense Opcode */ # define SCSI_STRTSTP 0x1B /* Start/Stop */ # define SCSI_LOADUNLD 0x1B /* Load/Unload */ big24 d_lba; /* LUN and logical block address */ byte d_nblocks; /* Transfer size in blocks */ byte d_control; /* Reserved and link bit fields, set to 0 */ } d; struct { /* Tape i/o commands */ byte t_scsi_op; /* SCSI Operation Code */ byte t_fixed; /* Fixed length? */ big24 t_trlength; /* Transfer length */ byte t_control; /* reserved and link bit fields, set to 0 */ } t; } cdb0_t; #define scsi_op d.d_scsi_op #define lba d.d_lba #define nblocks d.d_nblocks #define fixed t.t_fixed #define trlength t.t_trlength #define control d.d_control /* SCSI Group 1 Command Descriptor Block structure */ typedef union { struct { /* Disk i/o commands */ byte d_scsi_op; /* SCSI Operation Code */ # define SCSI_CAPACITY 0x25 /* Read Capacity */ # define SCSI_READ1 0x28 /* Group 1 Read Opcode */ # define SCSI_WRITE1 0x2A /* Group 1 Write Opcode */ byte d_lunra; /* LUN etc. */ big32 d_lba; /* Logical Block Address */ byte reserved; big16 d_nblocks; /* transf