[Qemu-devel] [PATCH] parallel port support for qemu.

[Mark Jonckheere <mark.jonckheere@easynet.be>]

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This patch adds parallel printer ports to the emulated  pc hardware.
The code in hw/parallel.c has been derived from hw/serial.c.

It has been tested on a linux host with a MSDOS-5 and a Knoppix 3.3 guest.

What is missing:
    - EPP/ECP/IEEE-1284 mode.
    - redirecting printer output to an arbitrary filename.
    - redirecting printer output to a print spool.
    - redirecting printer output to a physical device.
    - an easy way to flush a spool before qemu is terminated:
      a fixed timeout, a formfeed character, a "flush" command,
      a <ctrl-alt-X> key sequence, or something else, ... ?
    - documentation.

If you like it, give it a try.

Groeten,
Mark.
-- 
:wq


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diff -urN qemu/Makefile.target qemu_parallel/Makefile.target
--- qemu/Makefile.target	Tue Jan  4 00:38:39 2005
+++ qemu_parallel/Makefile.target	Fri Jan  7 13:41:31 2005
@@ -316,7 +316,7 @@
 # Hardware support
 VL_OBJS+= ide.o ne2000.o pckbd.o vga.o $(SOUND_HW) dma.o $(AUDIODRV)
 VL_OBJS+= fdc.o mc146818rtc.o serial.o i8259.o i8254.o pc.o
-VL_OBJS+= cirrus_vga.o mixeng.o apic.o
+VL_OBJS+= cirrus_vga.o mixeng.o apic.o parallel.o
 endif
 ifeq ($(TARGET_ARCH), ppc)
 VL_OBJS+= ppc.o ide.o ne2000.o pckbd.o vga.o $(SOUND_HW) dma.o $(AUDIODRV)
diff -urN qemu/hw/parallel.c qemu_parallel/hw/parallel.c
--- qemu/hw/parallel.c	Thu Jan  1 01:00:00 1970
+++ qemu_parallel/hw/parallel.c	Fri Jan  7 17:25:35 2005
@@ -0,0 +1,188 @@
+/*
+ * QEMU Parallel PORT emulation
+ * 
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ * 
+ * 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 "vl.h"
+
+//#define DEBUG_PARALLEL
+
+/*
+ * These are the definitions for the Printer Status Register
+ */
+#define PARA_STS_BUSY	0x80	/* Busy complement */
+#define PARA_STS_ACK	0x40	/* Acknowledge */
+#define PARA_STS_PAPER	0x20	/* Out of paper */
+#define PARA_STS_ONLINE	0x10	/* Online */
+#define PARA_STS_ERROR	0x08	/* Error complement */
+
+/*
+ * These are the definitions for the Printer Control Register
+ */
+#define PARA_CTR_INTEN	0x10	/* IRQ Enable */
+#define PARA_CTR_SELECT	0x08	/* Select In complement */
+#define PARA_CTR_INIT	0x04	/* Initialize Printer complement */
+#define PARA_CTR_AUTOLF	0x02	/* Auto linefeed complement */
+#define PARA_CTR_STROBE	0x01	/* Strobe complement */
+
+struct ParallelState {
+    uint8_t data;
+    uint8_t status; /* read only register */
+    uint8_t control;
+    int irq;
+    int irq_pending;
+    CharDriverState *chr;
+};
+
+static void parallel_update_irq(ParallelState *s)
+{
+    if (s->irq_pending)
+        pic_set_irq(s->irq, 1);
+    else
+        pic_set_irq(s->irq, 0);
+}
+
+static void parallel_ioport_write(void *opaque, uint32_t addr, uint32_t val)
+{
+    ParallelState *s = opaque;
+    
+    addr &= 7;
+#ifdef DEBUG_PARALLEL
+    printf("parallel: write addr=0x%02x val=0x%02x\n", addr, val);
+#endif
+    switch(addr) {
+    case 0:
+        s->data = val;
+        parallel_update_irq(s);
+        break;
+    case 2:
+        if ((val & PARA_CTR_INIT) == 0 ) {
+            s->status = PARA_STS_BUSY;
+            s->status |= PARA_STS_ACK;
+            s->status |= PARA_STS_ONLINE;
+            s->status |= PARA_STS_ERROR;
+        }
+        else if (val & PARA_CTR_SELECT) {
+            if (val & PARA_CTR_STROBE) {
+                s->status &= ~PARA_STS_BUSY;
+                if ((s->control & PARA_CTR_STROBE) == 0)
+                    qemu_chr_write(s->chr, &s->data, 1);
+            } else {
+                if (s->control & PARA_CTR_INTEN) {
+                    s->irq_pending = 1;
+                }
+            }
+        }
+        parallel_update_irq(s);
+        s->control = val;
+        break;
+    }
+}
+
+static uint32_t parallel_ioport_read(void *opaque, uint32_t addr)
+{
+    ParallelState *s = opaque;
+    uint32_t ret = 0xff;
+
+    addr &= 7;
+    switch(addr) {
+    case 0:
+        ret = s->data; 
+        break;
+    case 1:
+        ret = s->status;
+        s->irq_pending = 0;
+        if ((s->status & PARA_STS_BUSY) == 0 && (s->control & PARA_CTR_STROBE) == 0) {
+            /* XXX Fixme: wait 5 microseconds */
+            if (s->status & PARA_STS_ACK)
+                s->status &= ~PARA_STS_ACK;
+            else {
+            /* XXX Fixme: wait 5 microseconds */
+                s->status |= PARA_STS_ACK;
+                s->status |= PARA_STS_BUSY;
+            }
+        }
+        parallel_update_irq(s);
+        break;
+    case 2:
+        ret = s->control;
+        break;
+    }
+#ifdef DEBUG_PARALLEL
+    printf("parallel: read addr=0x%02x val=0x%02x\n", addr, ret);
+#endif
+    return ret;
+}
+
+static int parallel_can_receive(ParallelState *s)
+{
+    return 0;
+}
+
+static void parallel_receive_byte(ParallelState *s, int ch)
+{
+}
+
+static void parallel_receive_break(ParallelState *s)
+{
+}
+
+static int parallel_can_receive1(void *opaque)
+{
+    ParallelState *s = opaque;
+    return parallel_can_receive(s);
+}
+
+static void parallel_receive1(void *opaque, const uint8_t *buf, int size)
+{
+    ParallelState *s = opaque;
+    parallel_receive_byte(s, buf[0]);
+}
+
+static void parallel_event(void *opaque, int event)
+{
+    ParallelState *s = opaque;
+}
+
+/* If fd is zero, it means that the parallel device uses the console */
+ParallelState *parallel_init(int base, int irq, CharDriverState *chr)
+{
+    ParallelState *s;
+
+    s = qemu_mallocz(sizeof(ParallelState));
+    if (!s)
+        return NULL;
+    s->irq = irq;
+    s->data = 0;
+    s->status = PARA_STS_BUSY;
+    s->status |= PARA_STS_ACK;
+    s->status |= PARA_STS_ONLINE;
+    s->status |= PARA_STS_ERROR;
+    s->control = PARA_CTR_SELECT;
+    s->control |= PARA_CTR_INIT;
+
+    register_ioport_write(base, 8, 1, parallel_ioport_write, s);
+    register_ioport_read(base, 8, 1, parallel_ioport_read, s);
+    s->chr = chr;
+    qemu_chr_add_read_handler(chr, parallel_can_receive1, parallel_receive1, s);
+    qemu_chr_add_event_handler(chr, parallel_event);
+    return s;
+}
diff -urN qemu/hw/pc.c qemu_parallel/hw/pc.c
--- qemu/hw/pc.c	Tue Jan  4 00:30:09 2005
+++ qemu_parallel/hw/pc.c	Fri Jan  7 14:06:31 2005
@@ -376,6 +376,9 @@
 static int serial_io[MAX_SERIAL_PORTS] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
 static int serial_irq[MAX_SERIAL_PORTS] = { 4, 3, 4, 3 };
 
+static int parallel_io[MAX_PARALLEL_PORTS] = { 0x378, 0x278, 0x3bc };
+static int parallel_irq[MAX_PARALLEL_PORTS] = { 7, 7, 7 };
+
 /* PC hardware initialisation */
 void pc_init(int ram_size, int vga_ram_size, int boot_device,
              DisplayState *ds, const char **fd_filename, int snapshot,
@@ -538,6 +541,12 @@
         }
     }
 
+    for(i = 0; i < MAX_PARALLEL_PORTS; i++) {
+        if (parallel_hds[i]) {
+            parallel_init(parallel_io[i], parallel_irq[i], parallel_hds[i]);
+        }
+    }
+
     if (pci_enabled) {
         for(i = 0; i < nb_nics; i++) {
             pci_ne2000_init(pci_bus, &nd_table[i]);
diff -urN qemu/vl.c qemu_parallel/vl.c
--- qemu/vl.c	Thu Jan  6 21:43:38 2005
+++ qemu_parallel/vl.c	Fri Jan  7 14:04:13 2005
@@ -136,6 +136,7 @@
 int full_screen = 0;
 TextConsole *vga_console;
 CharDriverState *serial_hds[MAX_SERIAL_PORTS];
+CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
 
 /***********************************************************/
 /* x86 ISA bus support */
@@ -2671,6 +2672,7 @@
            "Debug/Expert options:\n"
            "-monitor dev    redirect the monitor to char device 'dev'\n"
            "-serial dev     redirect the serial port to char device 'dev'\n"
+           "-parallel dev   redirect the parallel port to char device 'dev'\n"
            "-pidfile file   Write PID to 'file'\n"
            "-S              freeze CPU at startup (use 'c' to start execution)\n"
            "-s              wait gdb connection to port %d\n"
@@ -2763,6 +2765,7 @@
     QEMU_OPTION_std_vga,
     QEMU_OPTION_monitor,
     QEMU_OPTION_serial,
+    QEMU_OPTION_parallel,
     QEMU_OPTION_loadvm,
     QEMU_OPTION_full_screen,
     QEMU_OPTION_pidfile,
@@ -2825,6 +2828,7 @@
     { "std-vga", 0, QEMU_OPTION_std_vga },
     { "monitor", 1, QEMU_OPTION_monitor },
     { "serial", 1, QEMU_OPTION_serial },
+    { "parallel", 1, QEMU_OPTION_parallel },
     { "loadvm", HAS_ARG, QEMU_OPTION_loadvm },
     { "full-screen", 0, QEMU_OPTION_full_screen },
     { "pidfile", HAS_ARG, QEMU_OPTION_pidfile },
@@ -2907,6 +2911,8 @@
     char monitor_device[128];
     char serial_devices[MAX_SERIAL_PORTS][128];
     int serial_device_index;
+    char parallel_devices[MAX_PARALLEL_PORTS][128];
+    int parallel_device_index;
     const char *loadvm = NULL;
     
 #if !defined(CONFIG_SOFTMMU)
@@ -2940,6 +2946,11 @@
         serial_devices[i][0] = '\0';
     serial_device_index = 0;
     
+    pstrcpy(parallel_devices[0], sizeof(parallel_devices[0]), "vc");
+    for(i = 1; i < MAX_PARALLEL_PORTS; i++)
+        parallel_devices[i][0] = '\0';
+    parallel_device_index = 0;
+    
     nb_tun_fds = 0;
     net_if_type = -1;
     nb_nics = 1;
@@ -3036,6 +3047,7 @@
             case QEMU_OPTION_nographic:
                 pstrcpy(monitor_device, sizeof(monitor_device), "stdio");
                 pstrcpy(serial_devices[0], sizeof(serial_devices[0]), "stdio");
+                pstrcpy(parallel_devices[0], sizeof(parallel_devices[0]), "stdio");
                 nographic = 1;
                 break;
             case QEMU_OPTION_kernel:
@@ -3250,6 +3262,15 @@
                         sizeof(serial_devices[0]), optarg);
                 serial_device_index++;
                 break;
+            case QEMU_OPTION_parallel:
+                if (parallel_device_index >= MAX_PARALLEL_PORTS) {
+                    fprintf(stderr, "qemu: too many parallel ports\n");
+                    exit(1);
+                }
+                pstrcpy(parallel_devices[parallel_device_index], 
+                        sizeof(parallel_devices[0]), optarg);
+                parallel_device_index++;
+                break;
 	    case QEMU_OPTION_loadvm:
 		loadvm = optarg;
 		break;
@@ -3473,6 +3494,19 @@
         }
     }
 
+    for(i = 0; i < MAX_PARALLEL_PORTS; i++) {
+        if (parallel_devices[i][0] != '\0') {
+            parallel_hds[i] = qemu_chr_open(parallel_devices[i]);
+            if (!parallel_hds[i]) {
+                fprintf(stderr, "qemu: could not open parallel device '%s'\n", 
+                        parallel_devices[i]);
+                exit(1);
+            }
+            if (!strcmp(parallel_devices[i], "vc"))
+                qemu_chr_printf(parallel_hds[i], "parallel%d console\n", i);
+        }
+    }
+
     /* setup cpu signal handlers for MMU / self modifying code handling */
 #if !defined(CONFIG_SOFTMMU)
     
diff -urN qemu/vl.h qemu_parallel/vl.h
--- qemu/vl.h	Tue Jan  4 00:28:03 2005
+++ qemu_parallel/vl.h	Fri Jan  7 13:54:29 2005
@@ -224,6 +224,12 @@
 
 extern CharDriverState *serial_hds[MAX_SERIAL_PORTS];
 
+/* parallel ports */
+
+#define MAX_PARALLEL_PORTS 3
+
+extern CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
+
 /* network redirectors support */
 
 #define MAX_NICS 8
@@ -632,6 +638,11 @@
 typedef struct SerialState SerialState;
 SerialState *serial_init(int base, int irq, CharDriverState *chr);
 
+/* parallel.c */
+
+typedef struct ParallelState ParallelState;
+ParallelState *parallel_init(int base, int irq, CharDriverState *chr);
+
 /* i8259.c */
 
 void pic_set_irq(int irq, int level);