/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */ /* All Rights Reserved */ /* * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2026 Oxide Computer Company * Copyright 2024 Hans Rosenfeld */ #ifndef _SYS_ASY_H #define _SYS_ASY_H #ifdef __cplusplus extern "C" { #endif #include <sys/tty.h> #include <sys/ksynch.h> #include <sys/dditypes.h> /* * internal bus type naming */ #define ASY_BUS_PCI (0) #define ASY_BUS_ISA (1) #define ASY_BUS_UNKNOWN (-1) #define ASY_MINOR_LEN (40) #define COM1_IOADDR 0x3f8 #define COM2_IOADDR 0x2f8 #define COM3_IOADDR 0x3e8 #define COM4_IOADDR 0x2e8 /* * asy_hwtype definitions * * W.r.t the supported device registers, the 16650 actually a superset of the * 16750, hence the ordering. */ #define ASY_8250A 0x00008250 /* 8250A or 16450 */ #define ASY_16550 0x10016550 /* broken FIFO which must not be used */ #define ASY_16550A 0x20016551 /* usable FIFO */ #define ASY_16750 0x30016750 /* 64 byte FIFO, auto flow control */ #define ASY_16650 0x40016650 /* 32 byte FIFO, auto flow control */ #define ASY_16950 0x50016950 /* 128 byte FIFO, auto flow control */ #define ASY_MAXCHIP ASY_16950 /* * Definitions for INS8250 / 16550 chips */ typedef enum { ASY_ILLEGAL = 0, /* 8250 / 16450 / 16550 registers */ ASY_THR, /* Transmitter Holding Register (W) */ ASY_RHR, /* Receiver Holding Register (R) */ ASY_IER, /* Interrupt Enable Register (R/W) */ ASY_FCR, /* FIFO Control Register (W) */ ASY_ISR, /* Interrupt Status Register (R) */ ASY_LCR, /* Line Control Register (R/W) */ ASY_MCR, /* Modem Control Register (R/W) */ ASY_LSR, /* Line Status Register (R) */ ASY_MSR, /* Modem Status Register (R) */ ASY_SPR, /* Scratch Pad Register (R/W) */ ASY_DLL, /* Divisor Latch Low (R/W) */ ASY_DLH, /* Divisor Latch High (R/W) */ /* 16750 extended register */ ASY_EFR, /* Extended Feature Register (R/W) */ /* 16650 extended registers */ ASY_XON1, /* XON Character 1 (R/W) */ ASY_XON2, /* XON Character 2 (R/W) */ ASY_XOFF1, /* XOFF Character 1 (R/W) */ ASY_XOFF2, /* XOFF Character 2 (R/W) */ /* 16950 additional registers */ ASY_ASR, /* Additional Status Register (R/W) */ ASY_RFL, /* Receiver FIFO Length (R/W) */ ASY_TFL, /* Transmitter FIFO Length (R/W) */ ASY_ICR, /* Indexed Control Register (R/W) */ /* 16950 indexed registers */ ASY_ACR, /* Additional Control Register (R/W) */ ASY_CPR, /* Clock Prescaler Register (R/W) */ ASY_TCR, /* Times Clock Register (R/W) */ ASY_CKS, /* Clock Select Register (R/W) */ ASY_TTL, /* Transmitter Trigger Level (R/W) */ ASY_RTL, /* Receiver Trigger Level (R/W) */ ASY_FCL, /* Flow Control Low-Level (R/W) */ ASY_FCH, /* Flow Control High-Level (R/W) */ ASY_ID1, /* Device Identification 1 (R) */ ASY_ID2, /* Device Identification 2 (R) */ ASY_ID3, /* Device Identification 3 (R) */ ASY_REV, /* Device Revision (R) */ ASY_CSR, /* Channel Software Reset (W) */ ASY_NMR, /* Nine-Bit Mode Register (R/W) */ ASY_NREG, } asy_reg_t; /* * INTEL 8210-A/B & 16450/16550 Registers Structure. */ /* Interrupt Enable Register */ typedef enum { ASY_IER_RIEN = 1 << 0, /* Received Data Ready */ ASY_IER_TIEN = 1 << 1, /* Tx Hold Register Empty */ ASY_IER_SIEN = 1 << 2, /* Receiver Line Status */ ASY_IER_MIEN = 1 << 3 /* Modem Status */ } asy_ier_t; #define ASY_IER_ALL \ (ASY_IER_RIEN | ASY_IER_TIEN | ASY_IER_SIEN | ASY_IER_MIEN) /* FIFO Control register */ typedef enum { ASY_FCR_FIFO_EN = 1 << 0, /* FIFOs enabled */ ASY_FCR_RHR_FL = 1 << 1, /* flush receiver FIFO */ ASY_FCR_THR_FL = 1 << 2, /* flush transmitter FIFO */ ASY_FCR_DMA = 1 << 3, /* DMA mode 1 */ ASY_FCR_THR_TR0 = 1 << 4, /* xmit trigger level bit 0 (16650) */ ASY_FCR_THR_TR1 = 1 << 5, /* xmit trigger level bit 1 (16650) */ ASY_FCR_RHR_TR0 = 1 << 6, /* receiver trigger level bit 0 */ ASY_FCR_RHR_TR1 = 1 << 7, /* receiver trigger level bit 1 */ } asy_fcr_t; #define ASY_FCR_FIFO64 ASY_FCR_THR_TR1 /* 64 byte FIFO en (16750) */ /* 16550 receiver trigger levels */ #define ASY_FCR_RHR_TRIG_1 0 /* 1 byte RX trigger level */ #define ASY_FCR_RHR_TRIG_4 ASY_FCR_RHR_TR0 /* 4 byte RX trigger level */ #define ASY_FCR_RHR_TRIG_8 ASY_FCR_RHR_TR1 /* 8 byte RX trigger level */ #define ASY_FCR_RHR_TRIG_14 \ (ASY_FCR_THR_TR0 | ASY_FCR_THR_TR1) /* 14 byte RX trigger level */ /* 16650 transmitter trigger levels */ #define ASY_FCR_THR_TRIG_16 0 /* 16 byte TX trigger level */ #define ASY_FCR_THR_TRIG_8 ASY_FCR_THR_TR0 /* 8 byte TX trigger level */ #define ASY_FCR_THR_TRIG_24 ASY_FCR_THR_TR1 /* 24 byte TX trigger level */ #define ASY_FCR_THR_TRIG_30 \ (ASY_FCR_THR_TR0 | ASY_FCR_THR_TR1) /* 30 byte TX trigger level */ #define ASY_FCR_FIFO_OFF 0 /* FIFOs disabled */ /* Interrupt Status Register */ #define ASY_ISR_NOINTR 0x01 /* no interrupt pending */ #define ASY_ISR_MASK 0x0e /* interrupt identification mask */ #define ASY_ISR_EMASK 0x3e /* interrupt id mask when EFR[4] = 1 (16650) */ #define ASY_ISR_FIFO64 0x20 /* 64 byte FIFOs enabled (16750) */ #define ASY_ISR_FIFOEN 0xc0 /* FIFOs enabled (16550A and up) */ #define ASY_ISR_ID_RLST 0x06 /* Receiver Line Status */ #define ASY_ISR_ID_RDA 0x04 /* Receiver Data Available */ #define ASY_ISR_ID_TMO 0x0c /* Character timeout (16550A and up) */ #define ASY_ISR_ID_THRE 0x02 /* Transmitter Holding Register Empty */ #define ASY_ISR_ID_MST 0x00 /* Modem Status changed */ #define ASY_ISR_ID_XOFF 0x10 /* Received XOFF / special character (16650) */ #define ASY_ISR_ID_RCTS 0x20 /* RTS/CTS changed (16650) */ /* Line Control Register */ typedef enum { ASY_LCR_WLS0 = 1 << 0, /* word length select bit 0 */ ASY_LCR_WLS1 = 1 << 1, /* word length select bit 2 */ ASY_LCR_STB = 1 << 2, /* number of stop bits */ ASY_LCR_PEN = 1 << 3, /* parity enable */ ASY_LCR_EPS = 1 << 4, /* even parity select */ ASY_LCR_SPS = 1 << 5, /* stick parity select */ ASY_LCR_SETBRK = 1 << 6, /* break key */ ASY_LCR_DLAB = 1 << 7 /* divisor latch access bit */ } asy_lcr_t; #define ASY_LCR_STOP1 0x00 #define ASY_LCR_STOP2 ASY_LCR_STB #define ASY_LCR_EFRACCESS 0xBF /* magic value for 16650 EFR access */ #define ASY_LCR_BITS5 0x00 /* 5 bits per char */ #define ASY_LCR_BITS6 ASY_LCR_WLS0 /* 6 bits per char */ #define ASY_LCR_BITS7 ASY_LCR_WLS1 /* 7 bits per char */ #define ASY_LCR_BITS8 (ASY_LCR_WLS0 | ASY_LCR_WLS1) /* 8 bits per char */ /* Modem Control Register */ typedef enum { ASY_MCR_DTR = 1 << 0, /* Data Terminal Ready */ ASY_MCR_RTS = 1 << 1, /* Request To Send */ ASY_MCR_OUT1 = 1 << 2, /* Aux output - not used */ ASY_MCR_OUT2 = 1 << 3, /* turns intr to 386 on/off */ ASY_MCR_LOOP = 1 << 4 /* loopback for diagnostics */ } asy_mcr_t; #define ASY_MCR_LOOPBACK \ (ASY_MCR_DTR | ASY_MCR_RTS | ASY_MCR_OUT1 | ASY_MCR_OUT2 | ASY_MCR_LOOP) /* Line Status Register */ typedef enum { ASY_LSR_DR = 1 << 0, /* data ready */ ASY_LSR_OE = 1 << 1, /* overrun error */ ASY_LSR_PE = 1 << 2, /* parity error */ ASY_LSR_FE = 1 << 3, /* framing error */ ASY_LSR_BI = 1 << 4, /* break interrupt */ ASY_LSR_THRE = 1 << 5, /* transmitter holding register empty */ ASY_LSR_TEMT = 1 << 6, /* transmitter empty (THR + TSR empty) */ ASY_LSR_DE = 1 << 7 /* Receiver FIFO data error */ } asy_lsr_t; #define ASY_LSR_ERRORS \ (ASY_LSR_OE | ASY_LSR_PE | ASY_LSR_FE | ASY_LSR_BI) /* Modem Status Register */ typedef enum { ASY_MSR_DCTS = 1 << 0, /* Delta Clear To Send */ ASY_MSR_DDSR = 1 << 1, /* Delta Data Set Ready */ ASY_MSR_TERI = 1 << 2, /* Trailing Edge Ring Indicator */ ASY_MSR_DDCD = 1 << 3, /* Delta Data Carrier Detect */ ASY_MSR_CTS = 1 << 4, /* Clear To Send */ ASY_MSR_DSR = 1 << 5, /* Data Set Ready */ ASY_MSR_RI = 1 << 6, /* Ring Indicator */ ASY_MSR_DCD = 1 << 7 /* Data Carrier Detect */ } asy_msr_t; #define ASY_MSR_DELTAS(x) \ ((x) & (ASY_MSR_DCTS | ASY_MSR_DDSR | ASY_MSR_TERI | ASY_MSR_DDCD)) #define ASY_MSR_STATES(x) \ ((x) & (ASY_MSR_CTS | ASY_MSR_DSR | ASY_MSR_RI | ASY_MSR_DCD)) /* Scratch Pad Register */ #define ASY_SPR_TEST 0x5a /* arbritrary value for testing SPR */ /* Extended Feature Register (16650) */ #define ASY_EFR_ENH_EN 0x10 /* IER[4:7], ISR[4,5], FCR[4,5], MCR[5:7] */ /* Additional Status Register (16950) */ typedef enum { ASY_ASR_TD = 1 << 0, /* Transmitter Disabled */ ASY_ASR_RTD = 1 << 1, /* Remote Transmitter Disabled */ ASY_ASR_RTS = 1 << 2, /* RTS status */ ASY_ASR_DTR = 1 << 3, /* DTR status */ ASY_ASR_SCD = 1 << 4, /* Special Character detected */ ASY_ASR_FIFOSEL = 1 << 5, /* FIFOSEL pin status */ ASY_ASR_FIFOSZ = 1 << 6, /* FIFO size */ ASY_ASR_TI = 1 << 7 /* Transmitter Idle */ } asy_16950_asr_t; /* Additional Control Register (16950) */ #define ASY_ACR_RD 0x01 /* Receiver Disable */ #define ASY_ACR_TD 0x02 /* Transmitter Disable */ #define ASY_ACR_DSR 0x04 /* Automatic DSR flow control */ #define ASY_ACR_DTR 0x18 /* DTR line configuration */ #define ASY_ACR_TRIG 0x20 /* 950 mode trigger levels enable */ #define ASY_ACR_ICR 0x40 /* ICR read enable */ #define ASY_ACR_ASR 0x80 /* Additional Status Enable */ #define ASY_ACR_DTR_NORM 0x00 /* DTR normal (compatible) */ #define ASY_ACR_DTR_FLOW 0x08 /* DTR used for flow-control */ #define ASY_ACR_DTR_RS485_LOW 0x10 /* DTR drives ext. RS485 buffer low */ #define ASY_ACR_DTR_RS485_HIGH 0x18 /* DTR drives ext. RS485 buffer high */ /* Clock Select Register (16950) */ #define ASY_CKS_RCLK 0x00 /* RCLK pin drives receiver clock */ #define ASY_CKS_RDSR 0x01 /* DSR pin drives receiver clock */ #define ASY_CKS_RBDOUT 0x02 /* BDOUT pint drives receiver clock */ #define ASY_CKS_RTCLK 0x03 /* transmitter clock drives receiver clock */ #define ASY_CKS_BDO_DIS 0x04 /* Disable BDOUT pin */ #define ASY_CKS_RCLK_1X 0x08 /* Receiver clock in isochronous 1x mode */ #define ASY_CKS_DTR_NO 0x00 /* DTR pin defined by ACR[ASY_ACR_DTR] */ #define ASY_CKS_DTR_T1X 0x10 /* Transmitter 1x clock on DTR pin */ #define ASY_CKS_DTR_BDO 0x20 /* Baud rate generator output on DTR pin */ #define ASY_CKS_TCLK_RI 0x40 /* External transmitter clock on RI pin */ #define ASY_CKS_TCLK_1X 0x80 /* Transmitter clock in isochronous 1x mode */ /* Serial in/out requests */ #define OVERRUN 040000 #define FRERROR 020000 #define PERROR 010000 #define S_ERRORS (PERROR|OVERRUN|FRERROR) /* * Ring buffer and async line management definitions. */ #define RINGBITS 16 /* # of bits in ring ptrs */ #define RINGSIZE (1<<RINGBITS) /* size of ring */ #define RINGMASK (RINGSIZE-1) #define RINGFRAC 12 /* fraction of ring to force flush */ #define RING_INIT(ap) ((ap)->async_rput = (ap)->async_rget = 0) #define RING_CNT(ap) (((ap)->async_rput >= (ap)->async_rget) ? \ ((ap)->async_rput - (ap)->async_rget):\ ((0x10000 - (ap)->async_rget) + (ap)->async_rput)) #define RING_FRAC(ap) ((int)RING_CNT(ap) >= (int)(RINGSIZE/RINGFRAC)) #define RING_POK(ap, n) ((int)RING_CNT(ap) < (int)(RINGSIZE-(n))) #define RING_PUT(ap, c) \ ((ap)->async_ring[(ap)->async_rput++ & RINGMASK] = (uchar_t)(c)) #define RING_UNPUT(ap) ((ap)->async_rput--) #define RING_GOK(ap, n) ((int)RING_CNT(ap) >= (int)(n)) #define RING_GET(ap) ((ap)->async_ring[(ap)->async_rget++ & RINGMASK]) #define RING_EAT(ap, n) ((ap)->async_rget += (n)) #define RING_MARK(ap, c, s) \ ((ap)->async_ring[(ap)->async_rput++ & RINGMASK] = ((uchar_t)(c)|(s))) #define RING_UNMARK(ap) \ ((ap)->async_ring[((ap)->async_rget) & RINGMASK] &= ~S_ERRORS) #define RING_ERR(ap, c) \ ((ap)->async_ring[((ap)->async_rget) & RINGMASK] & (c)) /* definitions for asy_progress */ typedef enum { ASY_PROGRESS_REGS = 1 << 0, ASY_PROGRESS_SOFTINT = 1 << 1, ASY_PROGRESS_INT = 1 << 2, ASY_PROGRESS_MUTEX = 1 << 3, ASY_PROGRESS_ASYNC = 1 << 4, ASY_PROGRESS_MINOR = 1 << 5 } asy_progress_t; /* definitions for asy_flags field */ typedef enum { ASY_NEEDSOFT = 1 << 0, ASY_DOINGSOFT = 1 << 1, ASY_PPS = 1 << 2, ASY_PPS_EDGE = 1 << 3, ASY_DOINGSOFT_RETRY = 1 << 4, ASY_RTS_DTR_OFF = 1 << 5, ASY_IGNORE_CD = 1 << 6, ASY_CONSOLE = 1 << 7, ASY_DDI_SUSPENDED = 1 << 8, /* suspended by DDI */ } asy_flags_t; /* definitions for asy_flags2 field */ typedef enum { ASY2_NO_LOOPBACK = 1 << 0 /* Device doesn't support loopback */ } asy_flags2_t; /* * Hardware channel common data. One structure per port. * Each of the fields in this structure is required to be protected by a * mutex lock at the highest priority at which it can be altered. * The asy_flags, and asy_next fields can be altered by interrupt * handling code that must be protected by the mutex whose handle is * stored in asy_excl_hi. All others can be protected by the asy_excl * mutex, which is lower priority and adaptive. */ struct asycom { #ifdef DEBUG int asy_debug; /* per-instance debug flags */ #endif asy_progress_t asy_progress; /* attach progress */ asy_flags_t asy_flags; /* random flags */ /* protected by asy_excl_hi lock */ uint_t asy_hwtype; /* HW type: ASY16550A, etc. */ uint_t asy_use_fifo; /* HW FIFO use it or not ?? */ uint_t asy_fifo_buf; /* With FIFO = 16, otherwise = 1 */ asy_flags2_t asy_flags2; /* flags which don't change, no lock */ uint8_t *asy_ioaddr; /* i/o address of ASY port */ struct asyncline *asy_priv; /* protocol private data -- asyncline */ dev_info_t *asy_dip; /* dev_info */ int asy_unit; /* which port */ kmutex_t asy_excl; /* asy adaptive mutex */ kmutex_t asy_excl_hi; /* asy spinlock mutex */ kmutex_t asy_soft_lock; /* soft lock for guarding softpend. */ int asysoftpend; /* Flag indicating soft int pending. */ ddi_softint_handle_t asy_soft_inth; uint_t asy_soft_intr_pri; ddi_intr_handle_t *asy_inth; size_t asy_inth_sz; uint_t asy_intr_pri; int asy_intr_cnt; int asy_intr_cap; int asy_intr_type; int asy_intr_types; /* * The asy_soft_sr mutex should only be taken by the soft interrupt * handler and the driver DDI_SUSPEND/DDI_RESUME code. It * shouldn't be taken by any code that may get called indirectly * by the soft interrupt handler (e.g. as a result of a put or * putnext call). */ kmutex_t asy_soft_sr; /* soft int suspend/resume mutex */ uchar_t asy_msr; /* saved modem status */ uchar_t asy_mcr; /* soft carrier bits */ uchar_t asy_lcr; /* console lcr bits */ uchar_t asy_bidx; /* console baud rate index */ tcflag_t asy_cflag; /* console mode bits */ struct cons_polledio polledio; /* polled I/O functions */ ddi_acc_handle_t asy_iohandle; /* Data access handle */ tcflag_t asy_ocflag; /* old console mode bits */ uchar_t asy_com_port; /* COM port number, or zero */ uchar_t asy_fifor; /* FIFOR register setting */ uint8_t asy_acr; /* 16950 additional control register */ #ifdef DEBUG int asy_msint_cnt; /* number of times in async_msint */ #endif }; /* definitions for async_flags field */ typedef enum { ASYNC_EXCL_OPEN = 1 << 28, /* exclusive open */ ASYNC_WOPEN = 1 << 0, /* waiting for open to complete */ ASYNC_ISOPEN = 1 << 1, /* open is complete */ ASYNC_OUT = 1 << 2, /* line being used for dialout */ ASYNC_CARR_ON = 1 << 3, /* carrier on last time we looked */ ASYNC_STOPPED = 1 << 4, /* output is stopped */ ASYNC_DELAY = 1 << 5, /* waiting for delay to finish */ ASYNC_BREAK = 1 << 6, /* waiting for break to finish */ ASYNC_BUSY = 1 << 7, /* waiting for transmission finish */ ASYNC_DRAINING = 1 << 8, /* waiting for output to drain */ ASYNC_SERVICEIMM = 1 << 9, /* queue soft interrupt as soon as */ ASYNC_HW_IN_FLOW = 1 << 10, /* input flow control in effect */ ASYNC_HW_OUT_FLW = 1 << 11, /* output flow control in effect */ ASYNC_PROGRESS = 1 << 12, /* made progress on output effort */ ASYNC_CLOSING = 1 << 13, /* processing close on stream */ ASYNC_OUT_SUSPEND = 1 << 14, /* waiting for TIOCSBRK to finish */ ASYNC_HOLD_UTBRK = 1 << 15, /* waiting for untimed break hold */ /* the minimum time */ ASYNC_DTR_DELAY = 1 << 16, /* delaying DTR turn on */ ASYNC_SW_IN_FLOW = 1 << 17, /* sw input flow control in effect */ ASYNC_SW_OUT_FLW = 1 << 18, /* sw output flow control in effect */ ASYNC_SW_IN_NEEDED = 1 << 19, /* sw input flow control char is */ /* needed to be sent */ ASYNC_OUT_FLW_RESUME = 1 << 20, /* output need to be resumed */ /* because of transition of flow */ /* control from stop to start */ ASYNC_DDI_SUSPENDED = 1 << 21, /* suspended by DDI */ ASYNC_RESUME_BUFCALL = 1 << 22 /* call bufcall when resumed by DDI */ } async_flags_t; /* definitions for async_inflow_source field in struct asyncline */ typedef enum { IN_FLOW_NULL = 0 << 0, IN_FLOW_RINGBUFF = 1 << 0, IN_FLOW_STREAMS = 1 << 1, IN_FLOW_USER = 1 << 2 } async_inflow_t; /* * Asychronous protocol private data structure for ASY. * Each of the fields in the structure is required to be protected by * the lower priority lock except the fields that are set only at * base level but cleared (with out lock) at interrupt level. */ struct asyncline { async_flags_t async_flags; /* random flags */ kcondvar_t async_flags_cv; /* condition variable for flags */ kcondvar_t async_ops_cv; /* condition variable for async_ops */ dev_t async_dev; /* device major/minor numbers */ mblk_t *async_xmitblk; /* transmit: active msg block */ struct asycom *async_common; /* device common data */ tty_common_t async_ttycommon; /* tty driver common data */ bufcall_id_t async_wbufcid; /* id for pending write-side bufcall */ size_t async_wbufcds; /* Buffer size requested in bufcall */ timeout_id_t async_polltid; /* softint poll timeout id */ timeout_id_t async_dtrtid; /* delaying DTR turn on */ timeout_id_t async_utbrktid; /* hold minimum untimed break time id */ /* * The following fields are protected by the asy_excl_hi lock. * Some, such as async_flowc, are set only at the base level and * cleared (without the lock) only by the interrupt level. */ uchar_t *async_optr; /* output pointer */ int async_ocnt; /* output count */ uint_t async_rput; /* producing pointer for input */ uint_t async_rget; /* consuming pointer for input */ /* * Each character stuffed into the ring has two bytes associated * with it. The first byte is used to indicate special conditions * and the second byte is the actual data. The ring buffer * needs to be defined as ushort_t to accomodate this. */ ushort_t async_ring[RINGSIZE]; short async_break; /* break count */ async_inflow_t async_inflow_source; /* input flow control type */ /* * This union presumably exists to support a change that happened some * time in the distant past. The two overrun fields are used as * booleans; one imagines that the split between hardware and software * overruns was made some time after the driver was initially written * and that the earliest versions just had the single `async_overrun` * field. * * By using the union, out-of-tree consumers could presumably still * detect any type of overrun via testing the `async_overrun` field, * which would _de facto_ combine the two, while the driver keeps * finer-grained track of the specific kind of overrun. Of course, * this only works if consuming code treats any non-zero value as true, * and does not compare against 1 specifically. * * It is unclear if this is still necessary. One hopes that any such * consumers, if they exist, neither assign through `async_overrun` nor * look specifically for the value one to mean true. */ union { struct { uint8_t _hw; /* overrun (hw) */ uint8_t _sw; /* overrun (sw) */ } _a; uint16_t uover_overrun; } async_uover; #define async_overrun async_uover._a.uover_overrun #define async_hw_overrun async_uover._a._hw #define async_sw_overrun async_uover._a._sw short async_ext; /* modem status change count */ short async_work; /* work to do flag */ timeout_id_t async_timer; /* close drain progress timer */ mblk_t *async_suspqf; /* front of suspend queue */ mblk_t *async_suspqb; /* back of suspend queue */ int async_ops; /* active operations counter */ }; /* * OUTLINE defines the high-order flag bit in the minor device number that * controls use of a tty line for dialin and dialout simultaneously. */ #ifdef _LP64 #define OUTLINE (1 << (NBITSMINOR32 - 1)) #else #define OUTLINE (1 << (NBITSMINOR - 1)) #endif #define UNIT(x) (getminor(x) & ~OUTLINE) /* This corresponds to DDI_SOFTINT_MED used by the old softint routines. */ #define ASY_SOFT_INT_PRI 6 #ifdef __cplusplus } #endif #endif /* _SYS_ASY_H */
