Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 972 insertions, 0 deletions

diff --git a/qemu/hw/char/serial.c b/qemu/hw/char/serial.c
new file mode 100644
index 000000000..513d73c27
--- /dev/null
+++ b/qemu/hw/char/serial.c
@@ -0,0 +1,972 @@
+/*
+ * 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
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "hw/char/serial.h"
+#include "sysemu/char.h"
+#include "qemu/timer.h"
+#include "exec/address-spaces.h"
+#include "qemu/error-report.h"
+
+//#define DEBUG_SERIAL
+
+#define UART_LCR_DLAB	0x80	/* Divisor latch access bit */
+
+#define UART_IER_MSI	0x08	/* Enable Modem status interrupt */
+#define UART_IER_RLSI	0x04	/* Enable receiver line status interrupt */
+#define UART_IER_THRI	0x02	/* Enable Transmitter holding register int. */
+#define UART_IER_RDI	0x01	/* Enable receiver data interrupt */
+
+#define UART_IIR_NO_INT	0x01	/* No interrupts pending */
+#define UART_IIR_ID	0x06	/* Mask for the interrupt ID */
+
+#define UART_IIR_MSI	0x00	/* Modem status interrupt */
+#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
+ */
+#define UART_MCR_LOOP	0x10	/* Enable loopback test mode */
+#define UART_MCR_OUT2	0x08	/* Out2 complement */
+#define UART_MCR_OUT1	0x04	/* Out1 complement */
+#define UART_MCR_RTS	0x02	/* RTS complement */
+#define UART_MCR_DTR	0x01	/* DTR complement */
+
+/*
+ * These are the definitions for the Modem Status Register
+ */
+#define UART_MSR_DCD	0x80	/* Data Carrier Detect */
+#define UART_MSR_RI	0x40	/* Ring Indicator */
+#define UART_MSR_DSR	0x20	/* Data Set Ready */
+#define UART_MSR_CTS	0x10	/* Clear to Send */
+#define UART_MSR_DDCD	0x08	/* Delta DCD */
+#define UART_MSR_TERI	0x04	/* Trailing edge ring indicator */
+#define UART_MSR_DDSR	0x02	/* Delta DSR */
+#define UART_MSR_DCTS	0x01	/* Delta CTS */
+#define UART_MSR_ANY_DELTA 0x0F	/* Any of the delta bits! */
+
+#define UART_LSR_TEMT	0x40	/* Transmitter empty */
+#define UART_LSR_THRE	0x20	/* Transmit-hold-register empty */
+#define UART_LSR_BI	0x10	/* Break interrupt indicator */
+#define UART_LSR_FE	0x08	/* Frame error indicator */
+#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 */
+
+/* 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 MAX_XMIT_RETRY      4
+
+#ifdef DEBUG_SERIAL
+#define DPRINTF(fmt, ...) \
+do { fprintf(stderr, "serial: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+do {} while (0)
+#endif
+
+static void serial_receive1(void *opaque, const uint8_t *buf, int size);
+
+static inline void recv_fifo_put(SerialState *s, uint8_t chr)
+{
+    /* Receive overruns do not overwrite FIFO contents. */
+    if (!fifo8_is_full(&s->recv_fifo)) {
+        fifo8_push(&s->recv_fifo, chr);
+    } else {
+        s->lsr |= UART_LSR_OE;
+    }
+}
+
+static void serial_update_irq(SerialState *s)
+{
+    uint8_t tmp_iir = UART_IIR_NO_INT;
+
+    if ((s->ier & UART_IER_RLSI) && (s->lsr & UART_LSR_INT_ANY)) {
+        tmp_iir = UART_IIR_RLSI;
+    } else if ((s->ier & UART_IER_RDI) && s->timeout_ipending) {
+        /* Note that(s->ier & UART_IER_RDI) can mask this interrupt,
+         * this is not in the specification but is observed on existing
+         * hardware.  */
+        tmp_iir = UART_IIR_CTI;
+    } else if ((s->ier & UART_IER_RDI) && (s->lsr & UART_LSR_DR) &&
+               (!(s->fcr & UART_FCR_FE) ||
+                s->recv_fifo.num >= 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);
+    }
+}
+
+static void serial_update_parameters(SerialState *s)
+{
+    int speed, parity, data_bits, stop_bits, frame_size;
+    QEMUSerialSetParams ssp;
+
+    if (s->divider == 0)
+        return;
+
+    /* Start bit. */
+    frame_size = 1;
+    if (s->lcr & 0x08) {
+        /* Parity bit. */
+        frame_size++;
+        if (s->lcr & 0x10)
+            parity = 'E';
+        else
+            parity = 'O';
+    } else {
+            parity = 'N';
+    }
+    if (s->lcr & 0x04)
+        stop_bits = 2;
+    else
+        stop_bits = 1;
+
+    data_bits = (s->lcr & 0x03) + 5;
+    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 =  (get_ticks_per_sec() / speed) * frame_size;
+    qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+
+    DPRINTF("speed=%d parity=%c data=%d stop=%d\n",
+           speed, parity, data_bits, stop_bits);
+}
+
+static void serial_update_msl(SerialState *s)
+{
+    uint8_t omsr;
+    int flags;
+
+    timer_del(s->modem_status_poll);
+
+    if (qemu_chr_fe_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)
+        timer_mod(s->modem_status_poll, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + get_ticks_per_sec() / 100);
+}
+
+static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque)
+{
+    SerialState *s = opaque;
+
+    do {
+        assert(!(s->lsr & UART_LSR_TEMT));
+        if (s->tsr_retry <= 0) {
+            assert(!(s->lsr & UART_LSR_THRE));
+
+            if (s->fcr & UART_FCR_FE) {
+                assert(!fifo8_is_empty(&s->xmit_fifo));
+                s->tsr = fifo8_pop(&s->xmit_fifo);
+                if (!s->xmit_fifo.num) {
+                    s->lsr |= UART_LSR_THRE;
+                }
+            } else {
+                s->tsr = s->thr;
+                s->lsr |= UART_LSR_THRE;
+            }
+            if ((s->lsr & UART_LSR_THRE) && !s->thr_ipending) {
+                s->thr_ipending = 1;
+                serial_update_irq(s);
+            }
+        }
+
+        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_fe_write(s->chr, &s->tsr, 1) != 1) {
+            if (s->tsr_retry >= 0 && s->tsr_retry < MAX_XMIT_RETRY &&
+                qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP,
+                                      serial_xmit, s) > 0) {
+                s->tsr_retry++;
+                return FALSE;
+            }
+            s->tsr_retry = 0;
+        } else {
+            s->tsr_retry = 0;
+        }
+
+        /* Transmit another byte if it is already available. It is only
+           possible when FIFO is enabled and not empty. */
+    } while (!(s->lsr & UART_LSR_THRE));
+
+    s->last_xmit_ts = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+    s->lsr |= UART_LSR_TEMT;
+
+    return FALSE;
+}
+
+
+/* Setter for FCR.
+   is_load flag means, that value is set while loading VM state
+   and interrupt should not be invoked */
+static void serial_write_fcr(SerialState *s, uint8_t val)
+{
+    /* Set fcr - val only has the bits that are supposed to "stick" */
+    s->fcr = val;
+
+    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;
+    }
+}
+
+static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
+                                unsigned size)
+{
+    SerialState *s = opaque;
+
+    addr &= 7;
+    DPRINTF("write addr=0x%" HWADDR_PRIx " val=0x%" PRIx64 "\n", addr, val);
+    switch(addr) {
+    default:
+    case 0:
+        if (s->lcr & UART_LCR_DLAB) {
+            s->divider = (s->divider & 0xff00) | val;
+            serial_update_parameters(s);
+        } else {
+            s->thr = (uint8_t) val;
+            if(s->fcr & UART_FCR_FE) {
+                /* xmit overruns overwrite data, so make space if needed */
+                if (fifo8_is_full(&s->xmit_fifo)) {
+                    fifo8_pop(&s->xmit_fifo);
+                }
+                fifo8_push(&s->xmit_fifo, s->thr);
+            }
+            s->thr_ipending = 0;
+            s->lsr &= ~UART_LSR_THRE;
+            s->lsr &= ~UART_LSR_TEMT;
+            serial_update_irq(s);
+            if (s->tsr_retry <= 0) {
+                serial_xmit(NULL, G_IO_OUT, s);
+            }
+        }
+        break;
+    case 1:
+        if (s->lcr & UART_LCR_DLAB) {
+            s->divider = (s->divider & 0x00ff) | (val << 8);
+            serial_update_parameters(s);
+        } else {
+            uint8_t changed = (s->ier ^ val) & 0x0f;
+            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 ((changed & UART_IER_MSI) && s->poll_msl >= 0) {
+                if (s->ier & UART_IER_MSI) {
+                     s->poll_msl = 1;
+                     serial_update_msl(s);
+                } else {
+                     timer_del(s->modem_status_poll);
+                     s->poll_msl = 0;
+                }
+            }
+
+            /* Turning on the THRE interrupt on IER can trigger the interrupt
+             * if LSR.THRE=1, even if it had been masked before by reading IIR.
+             * This is not in the datasheet, but Windows relies on it.  It is
+             * unclear if THRE has to be resampled every time THRI becomes
+             * 1, or only on the rising edge.  Bochs does the latter, and Windows
+             * always toggles IER to all zeroes and back to all ones, so do the
+             * same.
+             *
+             * If IER.THRI is zero, thr_ipending is not used.  Set it to zero
+             * so that the thr_ipending subsection is not migrated.
+             */
+            if (changed & UART_IER_THRI) {
+                if ((s->ier & UART_IER_THRI) && (s->lsr & UART_LSR_THRE)) {
+                    s->thr_ipending = 1;
+                } else {
+                    s->thr_ipending = 0;
+                }
+            }
+
+            if (changed) {
+                serial_update_irq(s);
+            }
+        }
+        break;
+    case 2:
+        /* 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) {
+            s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
+            timer_del(s->fifo_timeout_timer);
+            s->timeout_ipending = 0;
+            fifo8_reset(&s->recv_fifo);
+        }
+
+        if (val & UART_FCR_XFR) {
+            s->lsr |= UART_LSR_THRE;
+            s->thr_ipending = 1;
+            fifo8_reset(&s->xmit_fifo);
+        }
+
+        serial_write_fcr(s, val & 0xC9);
+        serial_update_irq(s);
+        break;
+    case 3:
+        {
+            int break_enable;
+            s->lcr = val;
+            serial_update_parameters(s);
+            break_enable = (val >> 6) & 1;
+            if (break_enable != s->last_break_enable) {
+                s->last_break_enable = break_enable;
+                qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
+                               &break_enable);
+            }
+        }
+        break;
+    case 4:
+        {
+            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_fe_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_fe_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 */
+                timer_mod(s->modem_status_poll, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->char_transmit_time);
+            }
+        }
+        break;
+    case 5:
+        break;
+    case 6:
+        break;
+    case 7:
+        s->scr = val;
+        break;
+    }
+}
+
+static uint64_t serial_ioport_read(void *opaque, hwaddr addr, unsigned size)
+{
+    SerialState *s = opaque;
+    uint32_t ret;
+
+    addr &= 7;
+    switch(addr) {
+    default:
+    case 0:
+        if (s->lcr & UART_LCR_DLAB) {
+            ret = s->divider & 0xff;
+        } else {
+            if(s->fcr & UART_FCR_FE) {
+                ret = fifo8_is_empty(&s->recv_fifo) ?
+                            0 : fifo8_pop(&s->recv_fifo);
+                if (s->recv_fifo.num == 0) {
+                    s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
+                } else {
+                    timer_mod(s->fifo_timeout_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 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 */
+                qemu_chr_accept_input(s->chr);
+            }
+        }
+        break;
+    case 1:
+        if (s->lcr & UART_LCR_DLAB) {
+            ret = (s->divider >> 8) & 0xff;
+        } else {
+            ret = s->ier;
+        }
+        break;
+    case 2:
+        ret = s->iir;
+        if ((ret & UART_IIR_ID) == UART_IIR_THRI) {
+            s->thr_ipending = 0;
+            serial_update_irq(s);
+        }
+        break;
+    case 3:
+        ret = s->lcr;
+        break;
+    case 4:
+        ret = s->mcr;
+        break;
+    case 5:
+        ret = s->lsr;
+        /* Clear break and overrun interrupts */
+        if (s->lsr & (UART_LSR_BI|UART_LSR_OE)) {
+            s->lsr &= ~(UART_LSR_BI|UART_LSR_OE);
+            serial_update_irq(s);
+        }
+        break;
+    case 6:
+        if (s->mcr & UART_MCR_LOOP) {
+            /* in loopback, the modem output pins are connected to the
+               inputs */
+            ret = (s->mcr & 0x0c) << 4;
+            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:
+        ret = s->scr;
+        break;
+    }
+    DPRINTF("read addr=0x%" HWADDR_PRIx " val=0x%02x\n", addr, ret);
+    return ret;
+}
+
+static int serial_can_receive(SerialState *s)
+{
+    if(s->fcr & UART_FCR_FE) {
+        if (s->recv_fifo.num < 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.num <= s->recv_fifo_itl) ?
+                        s->recv_fifo_itl - s->recv_fifo.num : 1;
+        } else {
+            return 0;
+        }
+    } else {
+        return !(s->lsr & UART_LSR_DR);
+    }
+}
+
+static void serial_receive_break(SerialState *s)
+{
+    s->rbr = 0;
+    /* When the LSR_DR is set a null byte is pushed into the fifo */
+    recv_fifo_put(s, '\0');
+    s->lsr |= UART_LSR_BI | UART_LSR_DR;
+    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.num) {
+        s->timeout_ipending = 1;
+        serial_update_irq(s);
+    }
+}
+
+static int serial_can_receive1(void *opaque)
+{
+    SerialState *s = opaque;
+    return serial_can_receive(s);
+}
+
+static void serial_receive1(void *opaque, const uint8_t *buf, int size)
+{
+    SerialState *s = opaque;
+
+    if (s->wakeup) {
+        qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
+    }
+    if(s->fcr & UART_FCR_FE) {
+        int i;
+        for (i = 0; i < size; i++) {
+            recv_fifo_put(s, buf[i]);
+        }
+        s->lsr |= UART_LSR_DR;
+        /* call the timeout receive callback in 4 char transmit time */
+        timer_mod(s->fifo_timeout_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->char_transmit_time * 4);
+    } else {
+        if (s->lsr & UART_LSR_DR)
+            s->lsr |= UART_LSR_OE;
+        s->rbr = buf[0];
+        s->lsr |= UART_LSR_DR;
+    }
+    serial_update_irq(s);
+}
+
+static void serial_event(void *opaque, int event)
+{
+    SerialState *s = opaque;
+    DPRINTF("event %x\n", event);
+    if (event == CHR_EVENT_BREAK)
+        serial_receive_break(s);
+}
+
+static void serial_pre_save(void *opaque)
+{
+    SerialState *s = opaque;
+    s->fcr_vmstate = s->fcr;
+}
+
+static int serial_pre_load(void *opaque)
+{
+    SerialState *s = opaque;
+    s->thr_ipending = -1;
+    s->poll_msl = -1;
+    return 0;
+}
+
+static int serial_post_load(void *opaque, int version_id)
+{
+    SerialState *s = opaque;
+
+    if (version_id < 3) {
+        s->fcr_vmstate = 0;
+    }
+    if (s->thr_ipending == -1) {
+        s->thr_ipending = ((s->iir & UART_IIR_ID) == UART_IIR_THRI);
+    }
+    s->last_break_enable = (s->lcr >> 6) & 1;
+    /* Initialize fcr via setter to perform essential side-effects */
+    serial_write_fcr(s, s->fcr_vmstate);
+    serial_update_parameters(s);
+    return 0;
+}
+
+static bool serial_thr_ipending_needed(void *opaque)
+{
+    SerialState *s = opaque;
+
+    if (s->ier & UART_IER_THRI) {
+        bool expected_value = ((s->iir & UART_IIR_ID) == UART_IIR_THRI);
+        return s->thr_ipending != expected_value;
+    } else {
+        /* LSR.THRE will be sampled again when the interrupt is
+         * enabled.  thr_ipending is not used in this case, do
+         * not migrate it.
+         */
+        return false;
+    }
+}
+
+static const VMStateDescription vmstate_serial_thr_ipending = {
+    .name = "serial/thr_ipending",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = serial_thr_ipending_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_INT32(thr_ipending, SerialState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static bool serial_tsr_needed(void *opaque)
+{
+    SerialState *s = (SerialState *)opaque;
+    return s->tsr_retry != 0;
+}
+
+static const VMStateDescription vmstate_serial_tsr = {
+    .name = "serial/tsr",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = serial_tsr_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_INT32(tsr_retry, SerialState),
+        VMSTATE_UINT8(thr, SerialState),
+        VMSTATE_UINT8(tsr, SerialState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static bool serial_recv_fifo_needed(void *opaque)
+{
+    SerialState *s = (SerialState *)opaque;
+    return !fifo8_is_empty(&s->recv_fifo);
+
+}
+
+static const VMStateDescription vmstate_serial_recv_fifo = {
+    .name = "serial/recv_fifo",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = serial_recv_fifo_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_STRUCT(recv_fifo, SerialState, 1, vmstate_fifo8, Fifo8),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static bool serial_xmit_fifo_needed(void *opaque)
+{
+    SerialState *s = (SerialState *)opaque;
+    return !fifo8_is_empty(&s->xmit_fifo);
+}
+
+static const VMStateDescription vmstate_serial_xmit_fifo = {
+    .name = "serial/xmit_fifo",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = serial_xmit_fifo_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_STRUCT(xmit_fifo, SerialState, 1, vmstate_fifo8, Fifo8),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static bool serial_fifo_timeout_timer_needed(void *opaque)
+{
+    SerialState *s = (SerialState *)opaque;
+    return timer_pending(s->fifo_timeout_timer);
+}
+
+static const VMStateDescription vmstate_serial_fifo_timeout_timer = {
+    .name = "serial/fifo_timeout_timer",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = serial_fifo_timeout_timer_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_TIMER_PTR(fifo_timeout_timer, SerialState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static bool serial_timeout_ipending_needed(void *opaque)
+{
+    SerialState *s = (SerialState *)opaque;
+    return s->timeout_ipending != 0;
+}
+
+static const VMStateDescription vmstate_serial_timeout_ipending = {
+    .name = "serial/timeout_ipending",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = serial_timeout_ipending_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_INT32(timeout_ipending, SerialState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static bool serial_poll_needed(void *opaque)
+{
+    SerialState *s = (SerialState *)opaque;
+    return s->poll_msl >= 0;
+}
+
+static const VMStateDescription vmstate_serial_poll = {
+    .name = "serial/poll",
+    .version_id = 1,
+    .needed = serial_poll_needed,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_INT32(poll_msl, SerialState),
+        VMSTATE_TIMER_PTR(modem_status_poll, SerialState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+const VMStateDescription vmstate_serial = {
+    .name = "serial",
+    .version_id = 3,
+    .minimum_version_id = 2,
+    .pre_save = serial_pre_save,
+    .pre_load = serial_pre_load,
+    .post_load = serial_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT16_V(divider, SerialState, 2),
+        VMSTATE_UINT8(rbr, SerialState),
+        VMSTATE_UINT8(ier, SerialState),
+        VMSTATE_UINT8(iir, SerialState),
+        VMSTATE_UINT8(lcr, SerialState),
+        VMSTATE_UINT8(mcr, SerialState),
+        VMSTATE_UINT8(lsr, SerialState),
+        VMSTATE_UINT8(msr, SerialState),
+        VMSTATE_UINT8(scr, SerialState),
+        VMSTATE_UINT8_V(fcr_vmstate, SerialState, 3),
+        VMSTATE_END_OF_LIST()
+    },
+    .subsections = (const VMStateDescription*[]) {
+        &vmstate_serial_thr_ipending,
+        &vmstate_serial_tsr,
+        &vmstate_serial_recv_fifo,
+        &vmstate_serial_xmit_fifo,
+        &vmstate_serial_fifo_timeout_timer,
+        &vmstate_serial_timeout_ipending,
+        &vmstate_serial_poll,
+        NULL
+    }
+};
+
+static void serial_reset(void *opaque)
+{
+    SerialState *s = opaque;
+
+    s->rbr = 0;
+    s->ier = 0;
+    s->iir = UART_IIR_NO_INT;
+    s->lcr = 0;
+    s->lsr = UART_LSR_TEMT | UART_LSR_THRE;
+    s->msr = UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS;
+    /* Default to 9600 baud, 1 start bit, 8 data bits, 1 stop bit, no parity. */
+    s->divider = 0x0C;
+    s->mcr = UART_MCR_OUT2;
+    s->scr = 0;
+    s->tsr_retry = 0;
+    s->char_transmit_time = (get_ticks_per_sec() / 9600) * 10;
+    s->poll_msl = 0;
+
+    s->timeout_ipending = 0;
+    timer_del(s->fifo_timeout_timer);
+    timer_del(s->modem_status_poll);
+
+    fifo8_reset(&s->recv_fifo);
+    fifo8_reset(&s->xmit_fifo);
+
+    s->last_xmit_ts = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+
+    s->thr_ipending = 0;
+    s->last_break_enable = 0;
+    qemu_irq_lower(s->irq);
+
+    serial_update_msl(s);
+    s->msr &= ~UART_MSR_ANY_DELTA;
+}
+
+void serial_realize_core(SerialState *s, Error **errp)
+{
+    if (!s->chr) {
+        error_setg(errp, "Can't create serial device, empty char device");
+        return;
+    }
+
+    s->modem_status_poll = timer_new_ns(QEMU_CLOCK_VIRTUAL, (QEMUTimerCB *) serial_update_msl, s);
+
+    s->fifo_timeout_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, (QEMUTimerCB *) fifo_timeout_int, s);
+    qemu_register_reset(serial_reset, s);
+
+    qemu_chr_add_handlers(s->chr, serial_can_receive1, serial_receive1,
+                          serial_event, s);
+    fifo8_create(&s->recv_fifo, UART_FIFO_LENGTH);
+    fifo8_create(&s->xmit_fifo, UART_FIFO_LENGTH);
+    serial_reset(s);
+}
+
+void serial_exit_core(SerialState *s)
+{
+    qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, NULL);
+    qemu_unregister_reset(serial_reset, s);
+}
+
+/* Change the main reference oscillator frequency. */
+void serial_set_frequency(SerialState *s, uint32_t frequency)
+{
+    s->baudbase = frequency;
+    serial_update_parameters(s);
+}
+
+const MemoryRegionOps serial_io_ops = {
+    .read = serial_ioport_read,
+    .write = serial_ioport_write,
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 1,
+    },
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+SerialState *serial_init(int base, qemu_irq irq, int baudbase,
+                         CharDriverState *chr, MemoryRegion *system_io)
+{
+    SerialState *s;
+    Error *err = NULL;
+
+    s = g_malloc0(sizeof(SerialState));
+
+    s->irq = irq;
+    s->baudbase = baudbase;
+    s->chr = chr;
+    serial_realize_core(s, &err);
+    if (err != NULL) {
+        error_report_err(err);
+        exit(1);
+    }
+
+    vmstate_register(NULL, base, &vmstate_serial, s);
+
+    memory_region_init_io(&s->io, NULL, &serial_io_ops, s, "serial", 8);
+    memory_region_add_subregion(system_io, base, &s->io);
+
+    return s;
+}
+
+/* Memory mapped interface */
+static uint64_t serial_mm_read(void *opaque, hwaddr addr,
+                               unsigned size)
+{
+    SerialState *s = opaque;
+    return serial_ioport_read(s, addr >> s->it_shift, 1);
+}
+
+static void serial_mm_write(void *opaque, hwaddr addr,
+                            uint64_t value, unsigned size)
+{
+    SerialState *s = opaque;
+    value &= ~0u >> (32 - (size * 8));
+    serial_ioport_write(s, addr >> s->it_shift, value, 1);
+}
+
+static const MemoryRegionOps serial_mm_ops[3] = {
+    [DEVICE_NATIVE_ENDIAN] = {
+        .read = serial_mm_read,
+        .write = serial_mm_write,
+        .endianness = DEVICE_NATIVE_ENDIAN,
+    },
+    [DEVICE_LITTLE_ENDIAN] = {
+        .read = serial_mm_read,
+        .write = serial_mm_write,
+        .endianness = DEVICE_LITTLE_ENDIAN,
+    },
+    [DEVICE_BIG_ENDIAN] = {
+        .read = serial_mm_read,
+        .write = serial_mm_write,
+        .endianness = DEVICE_BIG_ENDIAN,
+    },
+};
+
+SerialState *serial_mm_init(MemoryRegion *address_space,
+                            hwaddr base, int it_shift,
+                            qemu_irq irq, int baudbase,
+                            CharDriverState *chr, enum device_endian end)
+{
+    SerialState *s;
+    Error *err = NULL;
+
+    s = g_malloc0(sizeof(SerialState));
+
+    s->it_shift = it_shift;
+    s->irq = irq;
+    s->baudbase = baudbase;
+    s->chr = chr;
+
+    serial_realize_core(s, &err);
+    if (err != NULL) {
+        error_report_err(err);
+        exit(1);
+    }
+    vmstate_register(NULL, base, &vmstate_serial, s);
+
+    memory_region_init_io(&s->io, NULL, &serial_mm_ops[end], s,
+                          "serial", 8 << it_shift);
+    memory_region_add_subregion(address_space, base, &s->io);
+    return s;
+}