FreeBSD/Linux Kernel Cross Reference
sys/dev/virtio/mmio/virtio_mmio_cmdline.c

     /*-
      * Copyright (c) 2022 Colin Percival
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
      * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/limits.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/rman.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    
    #include <dev/virtio/mmio/virtio_mmio.h>
    
    /* Parse <size>@<baseaddr>:<irq>[:<id>] and add a child. */
    static void
    parsearg(driver_t *driver, device_t parent, char * arg)
    {
            device_t child;
            char * p;
            unsigned long sz;
            unsigned long baseaddr;
            unsigned long irq;
            unsigned long id;
    
            /* <size> */
            sz = strtoul(arg, &p, 0);
            if ((sz == 0) || (sz == ULONG_MAX))
                    goto bad;
            switch (*p) {
            case 'E': case 'e':
                    sz <<= 10;
                    /* FALLTHROUGH */
            case 'P': case 'p':
                    sz <<= 10;
                    /* FALLTHROUGH */
            case 'T': case 't':
                    sz <<= 10;
                    /* FALLTHROUGH */
            case 'G': case 'g':
                    sz <<= 10;
                    /* FALLTHROUGH */
            case 'M': case 'm':
                    sz <<= 10;
                    /* FALLTHROUGH */
            case 'K': case 'k':
                    sz <<= 10;
                    p++;
                    break;
            }
    
            /* @<baseaddr> */
            if (*p++ != '@')
                    goto bad;
            baseaddr = strtoul(p, &p, 0);
            if ((baseaddr == 0) || (baseaddr == ULONG_MAX))
                    goto bad;
    
            /* :<irq> */
            if (*p++ != ':')
                    goto bad;
            irq = strtoul(p, &p, 0);
            if ((irq == 0) || (irq == ULONG_MAX))
                    goto bad;
    
            /* Optionally, :<id> */
            if (*p) {
                    if (*p++ != ':')
                            goto bad;
                    id = strtoul(p, &p, 0);
                    if ((id == 0) || (id == ULONG_MAX))
                            goto bad;
            } else {
                    id = 0;
           }
   
           /* Should have reached the end of the string. */
           if (*p)
                   goto bad;
   
           /* Create the child and assign its resources. */
           child = BUS_ADD_CHILD(parent, 0, driver->name, id ? id : -1);
           bus_set_resource(child, SYS_RES_MEMORY, 0, baseaddr, sz);
           bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
           device_set_driver(child, driver);
   
           return;
   
   bad:
           printf("Error parsing virtio_mmio parameter: %s\n", arg);
   }
   
   static void
   vtmmio_cmdline_identify(driver_t *driver, device_t parent)
   {
           size_t n;
           char name[] = "virtio_mmio.device_XXXX";
           char * val;
   
           /* First variable just has its own name. */
           if ((val = kern_getenv("virtio_mmio.device")) == NULL)
                   return;
           parsearg(driver, parent, val);
           freeenv(val);
   
           /* The rest have _%zu suffixes. */
           for (n = 1; n <= 9999; n++) {
                   sprintf(name, "virtio_mmio.device_%zu", n);
                   if ((val = kern_getenv(name)) == NULL)
                           return;
                   parsearg(driver, parent, val);
                   freeenv(val);
           }
   }
   
   static device_method_t vtmmio_cmdline_methods[] = {
           /* Device interface. */
           DEVMETHOD(device_identify,      vtmmio_cmdline_identify),
           DEVMETHOD(device_probe,         vtmmio_probe),
   
           DEVMETHOD_END
   };
   DEFINE_CLASS_1(virtio_mmio, vtmmio_cmdline_driver, vtmmio_cmdline_methods,
       sizeof(struct vtmmio_softc), vtmmio_driver);
   DRIVER_MODULE(vtmmio_cmdline, nexus, vtmmio_cmdline_driver, 0, 0);

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