From 81174dae3f9189519cd60c7b79e91c291b021bbe Mon Sep 17 00:00:00 2001 From: aliguori Date: Mon, 11 Aug 2008 14:17:04 +0000 Subject: Upgrade emulated UART to 16550A (Stefano Stabellini) This patch upgrades the emulated UART to 16550A, the code comes from xen-unstable. The main improvement was introduced with the following patch and subsequent email thread: http://lists.xensource.com/archives/html/xen-devel/2007-12/msg00129.html The changes compared to previous version are: - change clock_gettime to qemu_get_clock - no token bucket anymore; - fixed a small bug handling IRQs; this was the problem that prevented kgdb to work over the serial (thanks to Jason Wessel for the help spotting and reproducing this bug). - many many style fixes; - savevm version number increased; - not including termios.h and sys/ioctl.h anymore, declaring static constants in qemu-char.h instead; Signed-off-by: Stefano Stabellini Signed-off-by: Anthony Liguori git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4993 c046a42c-6fe2-441c-8c8c-71466251a162 --- hw/serial.c | 486 ++++++++++++++++++++++++++++++++++++++++++++++++------------ qemu-char.h | 10 ++ vl.c | 31 ++++ 3 files changed, 433 insertions(+), 94 deletions(-) diff --git a/hw/serial.c b/hw/serial.c index ffd6ac9c81..4f20f4c682 100644 --- a/hw/serial.c +++ b/hw/serial.c @@ -1,7 +1,8 @@ /* - * QEMU 16450 UART emulation + * QEMU 16550A UART emulation * * Copyright (c) 2003-2004 Fabrice Bellard + * Copyright (c) 2008 Citrix Systems, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal @@ -43,6 +44,10 @@ #define UART_IIR_THRI 0x02 /* Transmitter holding register empty */ #define UART_IIR_RDI 0x04 /* Receiver data interrupt */ #define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */ +#define UART_IIR_CTI 0x0C /* Character Timeout Indication */ + +#define UART_IIR_FENF 0x80 /* Fifo enabled, but not functionning */ +#define UART_IIR_FE 0xC0 /* Fifo enabled */ /* * These are the definitions for the Modem Control Register @@ -73,17 +78,39 @@ #define UART_LSR_PE 0x04 /* Parity error indicator */ #define UART_LSR_OE 0x02 /* Overrun error indicator */ #define UART_LSR_DR 0x01 /* Receiver data ready */ +#define UART_LSR_INT_ANY 0x1E /* Any of the lsr-interrupt-triggering status bits */ -/* - * Delay TX IRQ after sending as much characters as the given interval would - * contain on real hardware. This avoids overloading the guest if it processes - * its output buffer in a loop inside the TX IRQ handler. - */ -#define THROTTLE_TX_INTERVAL 10 /* ms */ +/* Interrupt trigger levels. The byte-counts are for 16550A - in newer UARTs the byte-count for each ITL is higher. */ + +#define UART_FCR_ITL_1 0x00 /* 1 byte ITL */ +#define UART_FCR_ITL_2 0x40 /* 4 bytes ITL */ +#define UART_FCR_ITL_3 0x80 /* 8 bytes ITL */ +#define UART_FCR_ITL_4 0xC0 /* 14 bytes ITL */ + +#define UART_FCR_DMS 0x08 /* DMA Mode Select */ +#define UART_FCR_XFR 0x04 /* XMIT Fifo Reset */ +#define UART_FCR_RFR 0x02 /* RCVR Fifo Reset */ +#define UART_FCR_FE 0x01 /* FIFO Enable */ + +#define UART_FIFO_LENGTH 16 /* 16550A Fifo Length */ + +#define XMIT_FIFO 0 +#define RECV_FIFO 1 +#define MAX_XMIT_RETRY 4 + +struct SerialFIFO { + uint8_t data[UART_FIFO_LENGTH]; + uint8_t count; + uint8_t itl; /* Interrupt Trigger Level */ + uint8_t tail; + uint8_t head; +} typedef SerialFIFO; struct SerialState { uint16_t divider; uint8_t rbr; /* receive register */ + uint8_t thr; /* transmit holding register */ + uint8_t tsr; /* transmit shift register */ uint8_t ier; uint8_t iir; /* read only */ uint8_t lcr; @@ -91,6 +118,7 @@ struct SerialState { uint8_t lsr; /* read only */ uint8_t msr; /* read only */ uint8_t scr; + uint8_t fcr; /* NOTE: this hidden state is necessary for tx irq generation as it can be reset while reading iir */ int thr_ipending; @@ -100,55 +128,106 @@ struct SerialState { target_phys_addr_t base; int it_shift; int baudbase; - QEMUTimer *tx_timer; - int tx_burst; + int tsr_retry; + + uint64_t last_xmit_ts; /* Time when the last byte was successfully sent out of the tsr */ + SerialFIFO recv_fifo; + SerialFIFO xmit_fifo; + + struct QEMUTimer *fifo_timeout_timer; + int timeout_ipending; /* timeout interrupt pending state */ + struct QEMUTimer *transmit_timer; + + + uint64_t char_transmit_time; /* time to transmit a char in ticks*/ + int poll_msl; + + struct QEMUTimer *modem_status_poll; }; -static void serial_receive_byte(SerialState *s, int ch); +static void serial_receive1(void *opaque, const uint8_t *buf, int size); -static void serial_update_irq(SerialState *s) +static void fifo_clear(SerialState *s, int fifo) { - if ((s->lsr & UART_LSR_DR) && (s->ier & UART_IER_RDI)) { - s->iir = UART_IIR_RDI; - } else if (s->thr_ipending && (s->ier & UART_IER_THRI)) { - s->iir = UART_IIR_THRI; - } else { - s->iir = UART_IIR_NO_INT; - } - if (s->iir != UART_IIR_NO_INT) { - qemu_irq_raise(s->irq); - } else { - qemu_irq_lower(s->irq); - } + SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo; + memset(f->data, 0, UART_FIFO_LENGTH); + f->count = 0; + f->head = 0; + f->tail = 0; } -static void serial_tx_done(void *opaque) +static int fifo_put(SerialState *s, int fifo, uint8_t chr) { - SerialState *s = opaque; + SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo; - if (s->tx_burst < 0) { - uint16_t divider; + f->data[f->head++] = chr; - if (s->divider) - divider = s->divider; - else - divider = 1; + if (f->head == UART_FIFO_LENGTH) + f->head = 0; + f->count++; + + return 1; +} + +static uint8_t fifo_get(SerialState *s, int fifo) +{ + SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo; + uint8_t c; + + if(f->count == 0) + return 0; + + c = f->data[f->tail++]; + if (f->tail == UART_FIFO_LENGTH) + f->tail = 0; + f->count--; + + return c; +} - /* We assume 10 bits/char, OK for this purpose. */ - s->tx_burst = THROTTLE_TX_INTERVAL * 1000 / - (1000000 * 10 / (s->baudbase / divider)); +static void serial_update_irq(SerialState *s) +{ + uint8_t tmp_iir = UART_IIR_NO_INT; + + if (!s->ier) { + qemu_irq_lower(s->irq); + return; + } + + if ((s->ier & UART_IER_RLSI) && (s->lsr & UART_LSR_INT_ANY)) { + tmp_iir = UART_IIR_RLSI; + } else if (s->timeout_ipending) { + tmp_iir = UART_IIR_CTI; + } else if ((s->ier & UART_IER_RDI) && (s->lsr & UART_LSR_DR)) { + if (!(s->fcr & UART_FCR_FE)) { + tmp_iir = UART_IIR_RDI; + } else if (s->recv_fifo.count >= s->recv_fifo.itl) { + tmp_iir = UART_IIR_RDI; + } + } else if ((s->ier & UART_IER_THRI) && s->thr_ipending) { + tmp_iir = UART_IIR_THRI; + } else if ((s->ier & UART_IER_MSI) && (s->msr & UART_MSR_ANY_DELTA)) { + tmp_iir = UART_IIR_MSI; + } + + s->iir = tmp_iir | (s->iir & 0xF0); + + if (tmp_iir != UART_IIR_NO_INT) { + qemu_irq_raise(s->irq); + } else { + qemu_irq_lower(s->irq); } - s->thr_ipending = 1; - s->lsr |= UART_LSR_THRE; - s->lsr |= UART_LSR_TEMT; - serial_update_irq(s); } static void serial_update_parameters(SerialState *s) { - int speed, parity, data_bits, stop_bits; + int speed, parity, data_bits, stop_bits, frame_size; QEMUSerialSetParams ssp; + if (s->divider == 0) + return; + + frame_size = 1; if (s->lcr & 0x08) { if (s->lcr & 0x10) parity = 'E'; @@ -156,19 +235,21 @@ static void serial_update_parameters(SerialState *s) parity = 'O'; } else { parity = 'N'; + frame_size = 0; } if (s->lcr & 0x04) stop_bits = 2; else stop_bits = 1; + data_bits = (s->lcr & 0x03) + 5; - if (s->divider == 0) - return; + frame_size += data_bits + stop_bits; speed = s->baudbase / s->divider; ssp.speed = speed; ssp.parity = parity; ssp.data_bits = data_bits; ssp.stop_bits = stop_bits; + s->char_transmit_time = (ticks_per_sec / speed) * frame_size; qemu_chr_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp); #if 0 printf("speed=%d parity=%c data=%d stop=%d\n", @@ -176,10 +257,91 @@ static void serial_update_parameters(SerialState *s) #endif } +static void serial_update_msl(SerialState *s) +{ + uint8_t omsr; + int flags; + + qemu_del_timer(s->modem_status_poll); + + if (qemu_chr_ioctl(s->chr,CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP) { + s->poll_msl = -1; + return; + } + + omsr = s->msr; + + s->msr = (flags & CHR_TIOCM_CTS) ? s->msr | UART_MSR_CTS : s->msr & ~UART_MSR_CTS; + s->msr = (flags & CHR_TIOCM_DSR) ? s->msr | UART_MSR_DSR : s->msr & ~UART_MSR_DSR; + s->msr = (flags & CHR_TIOCM_CAR) ? s->msr | UART_MSR_DCD : s->msr & ~UART_MSR_DCD; + s->msr = (flags & CHR_TIOCM_RI) ? s->msr | UART_MSR_RI : s->msr & ~UART_MSR_RI; + + if (s->msr != omsr) { + /* Set delta bits */ + s->msr = s->msr | ((s->msr >> 4) ^ (omsr >> 4)); + /* UART_MSR_TERI only if change was from 1 -> 0 */ + if ((s->msr & UART_MSR_TERI) && !(omsr & UART_MSR_RI)) + s->msr &= ~UART_MSR_TERI; + serial_update_irq(s); + } + + /* The real 16550A apparently has a 250ns response latency to line status changes. + We'll be lazy and poll only every 10ms, and only poll it at all if MSI interrupts are turned on */ + + if (s->poll_msl) + qemu_mod_timer(s->modem_status_poll, qemu_get_clock(vm_clock) + ticks_per_sec / 100); +} + +static void serial_xmit(void *opaque) +{ + SerialState *s = opaque; + uint64_t new_xmit_ts = qemu_get_clock(vm_clock); + + if (s->tsr_retry <= 0) { + if (s->fcr & UART_FCR_FE) { + s->tsr = fifo_get(s,XMIT_FIFO); + if (!s->xmit_fifo.count) + s->lsr |= UART_LSR_THRE; + } else { + s->tsr = s->thr; + s->lsr |= UART_LSR_THRE; + } + } + + if (s->mcr & UART_MCR_LOOP) { + /* in loopback mode, say that we just received a char */ + serial_receive1(s, &s->tsr, 1); + } else if (qemu_chr_write(s->chr, &s->tsr, 1) != 1) { + if ((s->tsr_retry > 0) && (s->tsr_retry <= MAX_XMIT_RETRY)) { + s->tsr_retry++; + qemu_mod_timer(s->transmit_timer, new_xmit_ts + s->char_transmit_time); + return; + } else if (s->poll_msl < 0) { + /* If we exceed MAX_XMIT_RETRY and the backend is not a real serial port, then + drop any further failed writes instantly, until we get one that goes through. + This is to prevent guests that log to unconnected pipes or pty's from stalling. */ + s->tsr_retry = -1; + } + } + else { + s->tsr_retry = 0; + } + + s->last_xmit_ts = qemu_get_clock(vm_clock); + if (!(s->lsr & UART_LSR_THRE)) + qemu_mod_timer(s->transmit_timer, s->last_xmit_ts + s->char_transmit_time); + + if (s->lsr & UART_LSR_THRE) { + s->lsr |= UART_LSR_TEMT; + s->thr_ipending = 1; + serial_update_irq(s); + } +} + + static void serial_ioport_write(void *opaque, uint32_t addr, uint32_t val) { SerialState *s = opaque; - unsigned char ch; addr &= 7; #ifdef DEBUG_SERIAL @@ -192,25 +354,19 @@ static void serial_ioport_write(void *opaque, uint32_t addr, uint32_t val) s->divider = (s->divider & 0xff00) | val; serial_update_parameters(s); } else { + s->thr = (uint8_t) val; + if(s->fcr & UART_FCR_FE) { + fifo_put(s, XMIT_FIFO, s->thr); s->thr_ipending = 0; + s->lsr &= ~UART_LSR_TEMT; s->lsr &= ~UART_LSR_THRE; serial_update_irq(s); - ch = val; - if (!(s->mcr & UART_MCR_LOOP)) { - /* when not in loopback mode, send the char */ - qemu_chr_write(s->chr, &ch, 1); } else { - /* in loopback mode, say that we just received a char */ - serial_receive_byte(s, ch); - } - if (s->tx_burst > 0) { - s->tx_burst--; - serial_tx_done(s); - } else if (s->tx_burst == 0) { - s->tx_burst--; - qemu_mod_timer(s->tx_timer, qemu_get_clock(vm_clock) + - ticks_per_sec * THROTTLE_TX_INTERVAL / 1000); + s->thr_ipending = 0; + s->lsr &= ~UART_LSR_THRE; + serial_update_irq(s); } + serial_xmit(s); } break; case 1: @@ -219,13 +375,68 @@ static void serial_ioport_write(void *opaque, uint32_t addr, uint32_t val) serial_update_parameters(s); } else { s->ier = val & 0x0f; + /* If the backend device is a real serial port, turn polling of the modem + status lines on physical port on or off depending on UART_IER_MSI state */ + if (s->poll_msl >= 0) { + if (s->ier & UART_IER_MSI) { + s->poll_msl = 1; + serial_update_msl(s); + } else { + qemu_del_timer(s->modem_status_poll); + s->poll_msl = 0; + } + } if (s->lsr & UART_LSR_THRE) { s->thr_ipending = 1; + serial_update_irq(s); } - serial_update_irq(s); } break; case 2: + val = val & 0xFF; + + if (s->fcr == val) + break; + + /* Did the enable/disable flag change? If so, make sure FIFOs get flushed */ + if ((val ^ s->fcr) & UART_FCR_FE) + val |= UART_FCR_XFR | UART_FCR_RFR; + + /* FIFO clear */ + + if (val & UART_FCR_RFR) { + qemu_del_timer(s->fifo_timeout_timer); + s->timeout_ipending=0; + fifo_clear(s,RECV_FIFO); + } + + if (val & UART_FCR_XFR) { + fifo_clear(s,XMIT_FIFO); + } + + if (val & UART_FCR_FE) { + s->iir |= UART_IIR_FE; + /* Set RECV_FIFO trigger Level */ + switch (val & 0xC0) { + case UART_FCR_ITL_1: + s->recv_fifo.itl = 1; + break; + case UART_FCR_ITL_2: + s->recv_fifo.itl = 4; + break; + case UART_FCR_ITL_3: + s->recv_fifo.itl = 8; + break; + case UART_FCR_ITL_4: + s->recv_fifo.itl = 14; + break; + } + } else + s->iir &= ~UART_IIR_FE; + + /* Set fcr - or at least the bits in it that are supposed to "stick" */ + s->fcr = val & 0xC9; + serial_update_irq(s); break; case 3: { @@ -241,7 +452,30 @@ static void serial_ioport_write(void *opaque, uint32_t addr, uint32_t val) } break; case 4: - s->mcr = val & 0x1f; + { + int flags; + int old_mcr = s->mcr; + s->mcr = val & 0x1f; + if (val & UART_MCR_LOOP) + break; + + if (s->poll_msl >= 0 && old_mcr != s->mcr) { + + qemu_chr_ioctl(s->chr,CHR_IOCTL_SERIAL_GET_TIOCM, &flags); + + flags &= ~(CHR_TIOCM_RTS | CHR_TIOCM_DTR); + + if (val & UART_MCR_RTS) + flags |= CHR_TIOCM_RTS; + if (val & UART_MCR_DTR) + flags |= CHR_TIOCM_DTR; + + qemu_chr_ioctl(s->chr,CHR_IOCTL_SERIAL_SET_TIOCM, &flags); + /* Update the modem status after a one-character-send wait-time, since there may be a response + from the device/computer at the other end of the serial line */ + qemu_mod_timer(s->modem_status_poll, qemu_get_clock(vm_clock) + s->char_transmit_time); + } + } break; case 5: break; @@ -265,8 +499,17 @@ static uint32_t serial_ioport_read(void *opaque, uint32_t addr) if (s->lcr & UART_LCR_DLAB) { ret = s->divider & 0xff; } else { - ret = s->rbr; - s->lsr &= ~(UART_LSR_DR | UART_LSR_BI); + if(s->fcr & UART_FCR_FE) { + ret = fifo_get(s,RECV_FIFO); + if (s->recv_fifo.count == 0) + s->lsr &= ~(UART_LSR_DR | UART_LSR_BI); + else + qemu_mod_timer(s->fifo_timeout_timer, qemu_get_clock (vm_clock) + s->char_transmit_time * 4); + s->timeout_ipending = 0; + } else { + ret = s->rbr; + s->lsr &= ~(UART_LSR_DR | UART_LSR_BI); + } serial_update_irq(s); if (!(s->mcr & UART_MCR_LOOP)) { /* in loopback mode, don't receive any data */ @@ -283,8 +526,6 @@ static uint32_t serial_ioport_read(void *opaque, uint32_t addr) break; case 2: ret = s->iir; - /* reset THR pending bit */ - if ((ret & 0x7) == UART_IIR_THRI) s->thr_ipending = 0; serial_update_irq(s); break; @@ -296,6 +537,11 @@ static uint32_t serial_ioport_read(void *opaque, uint32_t addr) break; case 5: ret = s->lsr; + /* Clear break interrupt */ + if (s->lsr & UART_LSR_BI) { + s->lsr &= ~UART_LSR_BI; + serial_update_irq(s); + } break; case 6: if (s->mcr & UART_MCR_LOOP) { @@ -305,7 +551,14 @@ static uint32_t serial_ioport_read(void *opaque, uint32_t addr) ret |= (s->mcr & 0x02) << 3; ret |= (s->mcr & 0x01) << 5; } else { + if (s->poll_msl >= 0) + serial_update_msl(s); ret = s->msr; + /* Clear delta bits & msr int after read, if they were set */ + if (s->msr & UART_MSR_ANY_DELTA) { + s->msr &= 0xF0; + serial_update_irq(s); + } } break; case 7: @@ -320,14 +573,17 @@ static uint32_t serial_ioport_read(void *opaque, uint32_t addr) static int serial_can_receive(SerialState *s) { + if(s->fcr & UART_FCR_FE) { + if(s->recv_fifo.count < UART_FIFO_LENGTH) + /* Advertise (fifo.itl - fifo.count) bytes when count < ITL, and 1 if above. If UART_FIFO_LENGTH - fifo.count is + advertised the effect will be to almost always fill the fifo completely before the guest has a chance to respond, + effectively overriding the ITL that the guest has set. */ + return (s->recv_fifo.count <= s->recv_fifo.itl) ? s->recv_fifo.itl - s->recv_fifo.count : 1; + else + return 0; + } else { return !(s->lsr & UART_LSR_DR); -} - -static void serial_receive_byte(SerialState *s, int ch) -{ - s->rbr = ch; - s->lsr |= UART_LSR_DR; - serial_update_irq(s); + } } static void serial_receive_break(SerialState *s) @@ -337,6 +593,15 @@ static void serial_receive_break(SerialState *s) serial_update_irq(s); } +/* There's data in recv_fifo and s->rbr has not been read for 4 char transmit times */ +static void fifo_timeout_int (void *opaque) { + SerialState *s = opaque; + if (s->recv_fifo.count) { + s->timeout_ipending = 1; + serial_update_irq(s); + } +} + static int serial_can_receive1(void *opaque) { SerialState *s = opaque; @@ -346,12 +611,27 @@ static int serial_can_receive1(void *opaque) static void serial_receive1(void *opaque, const uint8_t *buf, int size) { SerialState *s = opaque; - serial_receive_byte(s, buf[0]); + if(s->fcr & UART_FCR_FE) { + int i; + for (i = 0; i < size; i++) { + fifo_put(s, RECV_FIFO, buf[i]); + } + s->lsr |= UART_LSR_DR; + /* call the timeout receive callback in 4 char transmit time */ + qemu_mod_timer(s->fifo_timeout_timer, qemu_get_clock (vm_clock) + s->char_transmit_time * 4); + } else { + s->rbr = buf[0]; + s->lsr |= UART_LSR_DR; + } + serial_update_irq(s); } static void serial_event(void *opaque, int event) { SerialState *s = opaque; +#ifdef DEBUG_SERIAL + printf("serial: event %x\n", event); +#endif if (event == CHR_EVENT_BREAK) serial_receive_break(s); } @@ -369,13 +649,15 @@ static void serial_save(QEMUFile *f, void *opaque) qemu_put_8s(f,&s->lsr); qemu_put_8s(f,&s->msr); qemu_put_8s(f,&s->scr); + qemu_put_8s(f,&s->fcr); } static int serial_load(QEMUFile *f, void *opaque, int version_id) { SerialState *s = opaque; + uint8_t fcr = 0; - if(version_id > 2) + if(version_id > 3) return -EINVAL; if (version_id >= 2) @@ -391,6 +673,11 @@ static int serial_load(QEMUFile *f, void *opaque, int version_id) qemu_get_8s(f,&s->msr); qemu_get_8s(f,&s->scr); + if (version_id >= 3) + qemu_get_8s(f,&fcr); + + /* Initialize fcr via setter to perform essential side-effects */ + serial_ioport_write(s, 0x02, fcr); return 0; } @@ -398,21 +685,47 @@ static void serial_reset(void *opaque) { SerialState *s = opaque; - s->divider = 0; s->rbr = 0; s->ier = 0; s->iir = UART_IIR_NO_INT; s->lcr = 0; - s->mcr = 0; s->lsr = UART_LSR_TEMT | UART_LSR_THRE; s->msr = UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS; + /* Default to 9600 baud, no parity, one stop bit */ + s->divider = 0x0C; + s->mcr = UART_MCR_OUT2; s->scr = 0; + s->tsr_retry = 0; + s->char_transmit_time = (ticks_per_sec / 9600) * 9; + s->poll_msl = 0; + + fifo_clear(s,RECV_FIFO); + fifo_clear(s,XMIT_FIFO); + + s->last_xmit_ts = qemu_get_clock(vm_clock); s->thr_ipending = 0; s->last_break_enable = 0; qemu_irq_lower(s->irq); } +static void serial_init_core(SerialState *s, qemu_irq irq, int baudbase, + CharDriverState *chr) +{ + s->irq = irq; + s->baudbase = baudbase; + s->chr = chr; + + s->modem_status_poll = qemu_new_timer(vm_clock, (QEMUTimerCB *) serial_update_msl, s); + + s->fifo_timeout_timer = qemu_new_timer(vm_clock, (QEMUTimerCB *) fifo_timeout_int, s); + s->transmit_timer = qemu_new_timer(vm_clock, (QEMUTimerCB *) serial_xmit, s); + + qemu_register_reset(serial_reset, s); + serial_reset(s); + +} + /* If fd is zero, it means that the serial device uses the console */ SerialState *serial_init(int base, qemu_irq irq, int baudbase, CharDriverState *chr) @@ -422,21 +735,13 @@ SerialState *serial_init(int base, qemu_irq irq, int baudbase, s = qemu_mallocz(sizeof(SerialState)); if (!s) return NULL; - s->irq = irq; - s->baudbase = baudbase; - - s->tx_timer = qemu_new_timer(vm_clock, serial_tx_done, s); - if (!s->tx_timer) - return NULL; - qemu_register_reset(serial_reset, s); - serial_reset(s); + serial_init_core(s, irq, baudbase, chr); - register_savevm("serial", base, 2, serial_save, serial_load, s); + register_savevm("serial", base, 3, serial_save, serial_load, s); register_ioport_write(base, 8, 1, serial_ioport_write, s); register_ioport_read(base, 8, 1, serial_ioport_read, s); - s->chr = chr; qemu_chr_add_handlers(chr, serial_can_receive1, serial_receive1, serial_event, s); return s; @@ -524,27 +829,20 @@ SerialState *serial_mm_init (target_phys_addr_t base, int it_shift, s = qemu_mallocz(sizeof(SerialState)); if (!s) return NULL; - s->irq = irq; + s->base = base; s->it_shift = it_shift; - s->baudbase= baudbase; - s->tx_timer = qemu_new_timer(vm_clock, serial_tx_done, s); - if (!s->tx_timer) - return NULL; - - qemu_register_reset(serial_reset, s); - serial_reset(s); - - register_savevm("serial", base, 2, serial_save, serial_load, s); + serial_init_core(s, irq, baudbase, chr); + register_savevm("serial", base, 3, serial_save, serial_load, s); if (ioregister) { s_io_memory = cpu_register_io_memory(0, serial_mm_read, serial_mm_write, s); cpu_register_physical_memory(base, 8 << it_shift, s_io_memory); } - s->chr = chr; qemu_chr_add_handlers(chr, serial_can_receive1, serial_receive1, serial_event, s); + serial_update_msl(s); return s; } diff --git a/qemu-char.h b/qemu-char.h index 29de03df58..2746472d58 100644 --- a/qemu-char.h +++ b/qemu-char.h @@ -28,6 +28,16 @@ typedef struct { #define CHR_IOCTL_PP_EPP_WRITE_ADDR 10 #define CHR_IOCTL_PP_EPP_WRITE 11 +#define CHR_IOCTL_SERIAL_SET_TIOCM 12 +#define CHR_IOCTL_SERIAL_GET_TIOCM 13 + +#define CHR_TIOCM_CTS 0x020 +#define CHR_TIOCM_CAR 0x040 +#define CHR_TIOCM_DSR 0x100 +#define CHR_TIOCM_RI 0x080 +#define CHR_TIOCM_DTR 0x002 +#define CHR_TIOCM_RTS 0x004 + typedef void IOEventHandler(void *opaque, int event); struct CharDriverState { diff --git a/vl.c b/vl.c index 03cd386906..e42ae6442d 100644 --- a/vl.c +++ b/vl.c @@ -2721,6 +2721,37 @@ static int tty_serial_ioctl(CharDriverState *chr, int cmd, void *arg) tcsendbreak(s->fd_in, 1); } break; + case CHR_IOCTL_SERIAL_GET_TIOCM: + { + int sarg = 0; + int *targ = (int *)arg; + ioctl(s->fd_in, TIOCMGET, &sarg); + *targ = 0; + if (sarg | TIOCM_CTS) + *targ |= CHR_TIOCM_CTS; + if (sarg | TIOCM_CAR) + *targ |= CHR_TIOCM_CAR; + if (sarg | TIOCM_DSR) + *targ |= CHR_TIOCM_DSR; + if (sarg | TIOCM_RI) + *targ |= CHR_TIOCM_RI; + if (sarg | TIOCM_DTR) + *targ |= CHR_TIOCM_DTR; + if (sarg | TIOCM_RTS) + *targ |= CHR_TIOCM_RTS; + } + break; + case CHR_IOCTL_SERIAL_SET_TIOCM: + { + int sarg = *(int *)arg; + int targ = 0; + if (sarg | CHR_TIOCM_DTR) + targ |= TIOCM_DTR; + if (sarg | CHR_TIOCM_RTS) + targ |= TIOCM_RTS; + ioctl(s->fd_in, TIOCMSET, &targ); + } + break; default: return -ENOTSUP; } -- cgit v1.2.3