Rewrite character driver protocol
As a side effect, remove the clone style, as the normal device style supports device cloning now. Change-Id: Ie82d1ef0385514a04a8faa139129a617895780b5
This commit is contained in:
David van Moolenbroek
@@ -8,8 +8,8 @@
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* 1 - 0xFF POSIX requests (see callnr.h)
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* 0x200 - 0x2FF Data link layer requests and responses
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* 0x300 - 0x3FF Bus controller requests and responses
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* 0x400 - 0x4FF Character device requests
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* 0x500 - 0x5FF Character device responses
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* 0x400 - 0x4FF Character device requests and responses
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* 0x500 - 0x5FF Block device requests and responses
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* 0x600 - 0x6FF Kernel calls to SYSTEM task
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* 0x700 - 0x7FF Reincarnation Server (RS) requests
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* 0x800 - 0x8FF Data Store (DS) requests
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@@ -25,7 +25,7 @@
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* 0x1200 - 0x12FF Devman
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* 0x1300 - 0x13FF TTY Requests
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* 0x1400 - 0x14FF VFS-FS transaction IDs
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* 0x1500 - 0x15FF Block device requests and responses
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* 0x1500 - 0x15FF (unused)
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* 0x1600 - 0x16FF VirtualBox (VBOX) requests (see vboxif.h)
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* 0x1700 - 0x17FF Real Time Clock requests and responses
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*
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@@ -186,58 +186,6 @@
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#define BUSC_I2C_EXEC (BUSC_RQ_BASE + 65) /* perform i2c action */
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#define BUSC_I2C_GRANT m2_i1 /* grant for request */
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/*===========================================================================*
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* Messages for CHARACTER device drivers *
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*===========================================================================*/
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/* Message types for character device drivers. */
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#define DEV_RQ_BASE 0x400 /* base for character device request types */
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#define DEV_RS_BASE 0x500 /* base for character device response types */
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#define CANCEL (DEV_RQ_BASE + 0) /* force a task to cancel */
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#define DEV_OPEN (DEV_RQ_BASE + 6) /* open a minor device */
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#define DEV_CLOSE (DEV_RQ_BASE + 7) /* close a minor device */
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#define DEV_SELECT (DEV_RQ_BASE + 12) /* request select() attention */
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#define DEV_READ_S (DEV_RQ_BASE + 20) /* (safecopy) read from minor */
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#define DEV_WRITE_S (DEV_RQ_BASE + 21) /* (safecopy) write to minor */
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#define DEV_SCATTER_S (DEV_RQ_BASE + 22) /* (safecopy) write from a vector */
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#define DEV_GATHER_S (DEV_RQ_BASE + 23) /* (safecopy) read into a vector */
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#define DEV_IOCTL_S (DEV_RQ_BASE + 24) /* (safecopy) I/O control code */
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#define IS_DEV_RQ(type) (((type) & ~0xff) == DEV_RQ_BASE)
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#define DEV_REVIVE (DEV_RS_BASE + 2) /* driver revives process */
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#define DEV_CLOSE_REPL (DEV_RS_BASE + 6) /* reply to DEV_CLOSE */
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#define DEV_SEL_REPL1 (DEV_RS_BASE + 7) /* first reply to DEV_SELECT */
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#define DEV_SEL_REPL2 (DEV_RS_BASE + 8) /* (opt) second reply to DEV_SELECT */
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#define DEV_OPEN_REPL (DEV_RS_BASE + 9) /* reply to DEV_OPEN */
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#define IS_DEV_RS(type) (((type) & ~0xff) == DEV_RS_BASE)
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/* Field names for messages to character device drivers. */
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#define DEVICE m2_i1 /* major-minor device */
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#define USER_ENDPT m2_i2 /* which endpoint initiated this call? */
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#define COUNT m2_i3 /* how many bytes to transfer */
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#define REQUEST m2_i3 /* ioctl request code */
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#define POSITION m2_l1 /* file offset (low 4 bytes) */
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#define HIGHPOS m2_l2 /* file offset (high 4 bytes) */
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#define ADDRESS m2_p1 /* core buffer address */
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#define IO_GRANT m2_p1 /* grant id (for DEV_*_S variants) */
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#define FLAGS m2_s1 /* operation flags */
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#define FLG_OP_NONBLOCK 0x1 /* operation is non blocking */
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/* Field names for DEV_SELECT messages to character device drivers. */
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#define DEV_MINOR m2_i1 /* minor device */
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#define DEV_SEL_OPS m2_i2 /* which select operations are requested */
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/* Field names used in reply messages from tasks. */
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#define REP_ENDPT m2_i1 /* # of proc on whose behalf I/O was done */
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#define REP_STATUS m2_i2 /* bytes transferred or error number */
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#define REP_IO_GRANT m2_i3 /* DEV_REVIVE: grant by which I/O was done */
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# define SUSPEND -998 /* status to suspend caller, reply later */
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/*===========================================================================*
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* Messages for networking layer *
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*===========================================================================*/
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@@ -939,6 +887,11 @@
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#define VFS_PFS_FD m2_i3
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#define VFS_PFS_FILP m2_p1
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/* Field names for GETRUSAGE related calls */
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#define RU_ENDPT m1_i1 /* indicates a process for sys_getrusage */
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#define RU_WHO m1_i1 /* who argument in getrusage call */
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#define RU_RUSAGE_ADDR m1_p1 /* pointer to struct rusage */
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/*===========================================================================*
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* Messages for VM server *
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*===========================================================================*/
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@@ -1298,13 +1251,71 @@
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#define VFS_TRANSID (VFS_TRANSACTION_BASE + 1)
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#define IS_VFS_FS_TRANSID(type) (((type) & ~0xff) == VFS_TRANSACTION_BASE)
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/*===========================================================================*
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* Messages for character devices *
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*===========================================================================*/
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/* Base type for character device requests and responses. */
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#define CDEV_RQ_BASE 0x400
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#define CDEV_RS_BASE 0x480
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#define IS_CDEV_RQ(type) (((type) & ~0x7f) == CDEV_RQ_BASE)
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#define IS_CDEV_RS(type) (((type) & ~0x7f) == CDEV_RS_BASE)
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/* Message types for character device requests. */
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#define CDEV_OPEN (CDEV_RQ_BASE + 0) /* open a minor device */
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#define CDEV_CLOSE (CDEV_RQ_BASE + 1) /* close a minor device */
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#define CDEV_READ (CDEV_RQ_BASE + 2) /* read into a buffer */
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#define CDEV_WRITE (CDEV_RQ_BASE + 3) /* write from a buffer */
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#define CDEV_IOCTL (CDEV_RQ_BASE + 4) /* I/O control operation */
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#define CDEV_CANCEL (CDEV_RQ_BASE + 5) /* cancel suspended request */
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#define CDEV_SELECT (CDEV_RQ_BASE + 6) /* test for ready operations */
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/* Message types for character device responses. */
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#define CDEV_REPLY (CDEV_RS_BASE + 0) /* general reply code */
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#define CDEV_SEL1_REPLY (CDEV_RS_BASE + 1) /* immediate select reply */
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#define CDEV_SEL2_REPLY (CDEV_RS_BASE + 2) /* select notification reply */
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/* Field names for block device messages. */
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#define CDEV_MINOR m10_i1 /* minor device number */
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#define CDEV_STATUS m10_i2 /* OK, error code, minor device, operations */
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#define CDEV_ACCESS m10_i2 /* access bits for open requests */
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#define CDEV_GRANT m10_i2 /* grant ID of buffer */
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#define CDEV_OPS m10_i2 /* requested select operations */
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#define CDEV_COUNT m10_i3 /* number of bytes to transfer */
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#define CDEV_USER m10_i3 /* endpoint of user process */
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#define CDEV_FLAGS m10_i4 /* transfer flags */
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#define CDEV_ID m10_l1 /* opaque request ID */
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#define CDEV_REQUEST m10_l2 /* I/O control request */
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#define CDEV_POS_LO m10_l2 /* transfer position (low bits) */
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#define CDEV_POS_HI m10_l3 /* transfer position (high bits) */
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/* Bits in 'CDEV_ACCESS' field of block device open requests. */
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# define CDEV_R_BIT 0x01 /* open with read access */
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# define CDEV_W_BIT 0x02 /* open with write access */
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# define CDEV_NOCTTY 0x04 /* not to become the controlling TTY */
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/* Bits in 'CDEV_FLAGS' field of block device transfer requests. */
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# define CDEV_NOFLAGS 0x00 /* no flags are set */
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# define CDEV_NONBLOCK 0x01 /* do not suspend I/O request */
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/* Bits in 'CDEV_OPS', 'CDEV_STATUS' fields of block device select messages. */
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# define CDEV_OP_RD 0x01 /* selected for read operation */
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# define CDEV_OP_WR 0x02 /* selected for write operation */
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# define CDEV_OP_ERR 0x04 /* selected for error operation */
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# define CDEV_NOTIFY 0x08 /* notification requested */
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/* Bits in 'CDEV_STATUS' field of block device open responses. */
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# define CDEV_CLONED 0x20000000 /* device is cloned */
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# define CDEV_CTTY 0x40000000 /* device is controlling TTY */
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/*===========================================================================*
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* Messages for block devices *
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*===========================================================================*/
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/* Base type for block device requests and responses. */
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#define BDEV_RQ_BASE 0x1500
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#define BDEV_RS_BASE 0x1580
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#define BDEV_RQ_BASE 0x500
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#define BDEV_RS_BASE 0x580
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#define IS_BDEV_RQ(type) (((type) & ~0x7f) == BDEV_RQ_BASE)
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#define IS_BDEV_RS(type) (((type) & ~0x7f) == BDEV_RS_BASE)
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@@ -1343,11 +1354,6 @@
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# define BDEV_FORCEWRITE 0x01 /* force write to disk immediately */
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# define BDEV_NOPAGE 0x02 /* eeprom: don't send page address */
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/* Field names for GETRUSAGE related calls */
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#define RU_ENDPT m1_i1 /* indicates a process for sys_getrusage */
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#define RU_WHO m1_i1 /* who argument in getrusage call */
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#define RU_RUSAGE_ADDR m1_p1 /* pointer to struct rusage */
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/*===========================================================================*
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* Messages for Real Time Clocks *
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*===========================================================================*/
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@@ -1382,4 +1388,10 @@
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#define RTCDEV_Y2KBUG 0x01 /* Interpret 1980 as 2000 for RTC w/Y2K bug */
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#define RTCDEV_CMOSREG 0x02 /* Also set the CMOS clock register bits. */
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/*===========================================================================*
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* Internal codes used by several services *
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*===========================================================================*/
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#define SUSPEND -998 /* status to suspend caller, reply later */
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/* _MINIX_COM_H */
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@@ -4,8 +4,8 @@
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#include <minix/sys_config.h>
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#include <minix/ipc.h>
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enum dev_style { STYLE_NDEV, STYLE_DEV, STYLE_TTY, STYLE_CTTY, STYLE_CLONE };
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#define IS_DEV_STYLE(s) (s>=STYLE_NDEV && s<=STYLE_CLONE)
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enum dev_style { STYLE_NDEV, STYLE_DEV, STYLE_TTY, STYLE_CTTY };
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#define IS_DEV_STYLE(s) (s>=STYLE_NDEV && s<=STYLE_CTTY)
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/*===========================================================================*
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* Major and minor device numbers *
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