FreeBSD/Linux Kernel Cross Reference
sys/x86/x86/nexus.c

     /*-
      * Copyright 1998 Massachusetts Institute of Technology
      *
      * Permission to use, copy, modify, and distribute this software and
      * its documentation for any purpose and without fee is hereby
      * granted, provided that both the above copyright notice and this
      * permission notice appear in all copies, that both the above
      * copyright notice and this permission notice appear in all
      * supporting documentation, and that the name of M.I.T. not be used
     * in advertising or publicity pertaining to distribution of the
     * software without specific, written prior permission.  M.I.T. makes
     * no representations about the suitability of this software for any
     * purpose.  It is provided "as is" without express or implied
     * warranty.
     *
     * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
     * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
     * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
     * SHALL M.I.T. 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/cdefs.h>
    __FBSDID("$FreeBSD: releng/9.1/sys/x86/x86/nexus.c 221324 2011-05-02 14:13:12Z jhb $");
    
    /*
     * This code implements a `root nexus' for Intel Architecture
     * machines.  The function of the root nexus is to serve as an
     * attachment point for both processors and buses, and to manage
     * resources which are common to all of them.  In particular,
     * this code implements the core resource managers for interrupt
     * requests, DMA requests (which rightfully should be a part of the
     * ISA code but it's easier to do it here for now), I/O port addresses,
     * and I/O memory address space.
     */
    
    #ifdef __amd64__
    #define DEV_APIC
    #else
    #include "opt_apic.h"
    #endif
    #include "opt_isa.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/linker.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <machine/bus.h>
    #include <machine/intr_machdep.h>
    #include <sys/rman.h>
    #include <sys/interrupt.h>
    
    #include <machine/vmparam.h>
    #include <vm/vm.h>
    #include <vm/pmap.h>
    #include <machine/pmap.h>
    
    #include <machine/metadata.h>
    #include <machine/nexusvar.h>
    #include <machine/resource.h>
    #include <machine/pc/bios.h>
    
    #ifdef DEV_APIC
    #include "pcib_if.h"
    #endif
    
    #ifdef DEV_ISA
    #include <isa/isavar.h>
    #ifdef PC98
    #include <pc98/cbus/cbus.h>
    #else
    #include <x86/isa/isa.h>
    #endif
    #endif
    #include <sys/rtprio.h>
    
    #define ELF_KERN_STR    ("elf"__XSTRING(__ELF_WORD_SIZE)" kernel")
    
    static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
    
    #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
    
    struct rman irq_rman, drq_rman, port_rman, mem_rman;
    
    static  int nexus_probe(device_t);
    static  int nexus_attach(device_t);
    static  int nexus_print_all_resources(device_t dev);
    static  int nexus_print_child(device_t, device_t);
    static device_t nexus_add_child(device_t bus, u_int order, const char *name,
                                   int unit);
   static  struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
                                                 u_long, u_long, u_long, u_int);
   static  int nexus_adjust_resource(device_t, device_t, int, struct resource *,
                                     u_long, u_long);
   #ifdef SMP
   static  int nexus_bind_intr(device_t, device_t, struct resource *, int);
   #endif
   static  int nexus_config_intr(device_t, int, enum intr_trigger,
                                 enum intr_polarity);
   static  int nexus_describe_intr(device_t dev, device_t child,
                                   struct resource *irq, void *cookie,
                                   const char *descr);
   static  int nexus_activate_resource(device_t, device_t, int, int,
                                       struct resource *);
   static  int nexus_deactivate_resource(device_t, device_t, int, int,
                                         struct resource *);
   static  int nexus_release_resource(device_t, device_t, int, int,
                                      struct resource *);
   static  int nexus_setup_intr(device_t, device_t, struct resource *, int flags,
                                driver_filter_t filter, void (*)(void *), void *,
                                 void **);
   static  int nexus_teardown_intr(device_t, device_t, struct resource *,
                                   void *);
   static struct resource_list *nexus_get_reslist(device_t dev, device_t child);
   static  int nexus_set_resource(device_t, device_t, int, int, u_long, u_long);
   static  int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *);
   static void nexus_delete_resource(device_t, device_t, int, int);
   #ifdef DEV_APIC
   static  int nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs);
   static  int nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs);
   static  int nexus_alloc_msix(device_t pcib, device_t dev, int *irq);
   static  int nexus_release_msix(device_t pcib, device_t dev, int irq);
   static  int nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data);
   #endif
   
   static device_method_t nexus_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         nexus_probe),
           DEVMETHOD(device_attach,        nexus_attach),
           DEVMETHOD(device_detach,        bus_generic_detach),
           DEVMETHOD(device_shutdown,      bus_generic_shutdown),
           DEVMETHOD(device_suspend,       bus_generic_suspend),
           DEVMETHOD(device_resume,        bus_generic_resume),
   
           /* Bus interface */
           DEVMETHOD(bus_print_child,      nexus_print_child),
           DEVMETHOD(bus_add_child,        nexus_add_child),
           DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
           DEVMETHOD(bus_adjust_resource,  nexus_adjust_resource),
           DEVMETHOD(bus_release_resource, nexus_release_resource),
           DEVMETHOD(bus_activate_resource, nexus_activate_resource),
           DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
           DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
           DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
   #ifdef SMP
           DEVMETHOD(bus_bind_intr,        nexus_bind_intr),
   #endif
           DEVMETHOD(bus_config_intr,      nexus_config_intr),
           DEVMETHOD(bus_describe_intr,    nexus_describe_intr),
           DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
           DEVMETHOD(bus_set_resource,     nexus_set_resource),
           DEVMETHOD(bus_get_resource,     nexus_get_resource),
           DEVMETHOD(bus_delete_resource,  nexus_delete_resource),
   
           /* pcib interface */
   #ifdef DEV_APIC
           DEVMETHOD(pcib_alloc_msi,       nexus_alloc_msi),
           DEVMETHOD(pcib_release_msi,     nexus_release_msi),
           DEVMETHOD(pcib_alloc_msix,      nexus_alloc_msix),
           DEVMETHOD(pcib_release_msix,    nexus_release_msix),
           DEVMETHOD(pcib_map_msi,         nexus_map_msi),
   #endif
   
           { 0, 0 }
   };
   
   DEFINE_CLASS_0(nexus, nexus_driver, nexus_methods, 1);
   static devclass_t nexus_devclass;
   
   DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
   
   static int
   nexus_probe(device_t dev)
   {
   
           device_quiet(dev);      /* suppress attach message for neatness */
           return (BUS_PROBE_GENERIC);
   }
   
   void
   nexus_init_resources(void)
   {
           int irq;
   
           /*
            * XXX working notes:
            *
            * - IRQ resource creation should be moved to the PIC/APIC driver.
            * - DRQ resource creation should be moved to the DMAC driver.
            * - The above should be sorted to probe earlier than any child busses.
            *
            * - Leave I/O and memory creation here, as child probes may need them.
            *   (especially eg. ACPI)
            */
   
           /*
            * IRQ's are on the mainboard on old systems, but on the ISA part
            * of PCI->ISA bridges.  There would be multiple sets of IRQs on
            * multi-ISA-bus systems.  PCI interrupts are routed to the ISA
            * component, so in a way, PCI can be a partial child of an ISA bus(!).
            * APIC interrupts are global though.
            */
           irq_rman.rm_start = 0;
           irq_rman.rm_type = RMAN_ARRAY;
           irq_rman.rm_descr = "Interrupt request lines";
           irq_rman.rm_end = NUM_IO_INTS - 1;
           if (rman_init(&irq_rman))
                   panic("nexus_init_resources irq_rman");
   
           /*
            * We search for regions of existing IRQs and add those to the IRQ
            * resource manager.
            */
           for (irq = 0; irq < NUM_IO_INTS; irq++)
                   if (intr_lookup_source(irq) != NULL)
                           if (rman_manage_region(&irq_rman, irq, irq) != 0)
                                   panic("nexus_init_resources irq_rman add");
   
           /*
            * ISA DMA on PCI systems is implemented in the ISA part of each
            * PCI->ISA bridge and the channels can be duplicated if there are
            * multiple bridges.  (eg: laptops with docking stations)
            */
           drq_rman.rm_start = 0;
   #ifdef PC98
           drq_rman.rm_end = 3;
   #else
           drq_rman.rm_end = 7;
   #endif
           drq_rman.rm_type = RMAN_ARRAY;
           drq_rman.rm_descr = "DMA request lines";
           /* XXX drq 0 not available on some machines */
           if (rman_init(&drq_rman)
               || rman_manage_region(&drq_rman,
                                     drq_rman.rm_start, drq_rman.rm_end))
                   panic("nexus_init_resources drq_rman");
   
           /*
            * However, IO ports and Memory truely are global at this level,
            * as are APIC interrupts (however many IO APICS there turn out
            * to be on large systems..)
            */
           port_rman.rm_start = 0;
           port_rman.rm_end = 0xffff;
           port_rman.rm_type = RMAN_ARRAY;
           port_rman.rm_descr = "I/O ports";
           if (rman_init(&port_rman)
               || rman_manage_region(&port_rman, 0, 0xffff))
                   panic("nexus_init_resources port_rman");
   
           mem_rman.rm_start = 0;
           mem_rman.rm_end = ~0ul;
           mem_rman.rm_type = RMAN_ARRAY;
           mem_rman.rm_descr = "I/O memory addresses";
           if (rman_init(&mem_rman)
               || rman_manage_region(&mem_rman, 0, ~0))
                   panic("nexus_init_resources mem_rman");
   }
   
   static int
   nexus_attach(device_t dev)
   {
   
           nexus_init_resources();
           bus_generic_probe(dev);
   
           /*
            * Explicitly add the legacy0 device here.  Other platform
            * types (such as ACPI), use their own nexus(4) subclass
            * driver to override this routine and add their own root bus.
            */
           if (BUS_ADD_CHILD(dev, 10, "legacy", 0) == NULL)
                   panic("legacy: could not attach");
           bus_generic_attach(dev);
           return 0;
   }
   
   static int
   nexus_print_all_resources(device_t dev)
   {
           struct  nexus_device *ndev = DEVTONX(dev);
           struct resource_list *rl = &ndev->nx_resources;
           int retval = 0;
   
           if (STAILQ_FIRST(rl))
                   retval += printf(" at");
   
           retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
           retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
           retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
   
           return retval;
   }
   
   static int
   nexus_print_child(device_t bus, device_t child)
   {
           int retval = 0;
   
           retval += bus_print_child_header(bus, child);
           retval += nexus_print_all_resources(child);
           if (device_get_flags(child))
                   retval += printf(" flags %#x", device_get_flags(child));
           retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
   
           return (retval);
   }
   
   static device_t
   nexus_add_child(device_t bus, u_int order, const char *name, int unit)
   {
           device_t                child;
           struct nexus_device     *ndev;
   
           ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
           if (!ndev)
                   return(0);
           resource_list_init(&ndev->nx_resources);
   
           child = device_add_child_ordered(bus, order, name, unit);
   
           /* should we free this in nexus_child_detached? */
           device_set_ivars(child, ndev);
   
           return(child);
   }
   
   static struct rman *
   nexus_rman(int type)
   {
           switch (type) {
           case SYS_RES_IRQ:
                   return (&irq_rman);
           case SYS_RES_DRQ:
                   return (&drq_rman);
           case SYS_RES_IOPORT:
                   return (&port_rman);
           case SYS_RES_MEMORY:
                   return (&mem_rman);
           default:
                   return (NULL);
           }
   }
   
   /*
    * Allocate a resource on behalf of child.  NB: child is usually going to be a
    * child of one of our descendants, not a direct child of nexus0.
    * (Exceptions include npx.)
    */
   static struct resource *
   nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
                        u_long start, u_long end, u_long count, u_int flags)
   {
           struct nexus_device *ndev = DEVTONX(child);
           struct  resource *rv;
           struct resource_list_entry *rle;
           struct  rman *rm;
           int needactivate = flags & RF_ACTIVE;
   
           /*
            * If this is an allocation of the "default" range for a given RID, and
            * we know what the resources for this device are (ie. they aren't maintained
            * by a child bus), then work out the start/end values.
            */
           if ((start == 0UL) && (end == ~0UL) && (count == 1)) {
                   if (ndev == NULL)
                           return(NULL);
                   rle = resource_list_find(&ndev->nx_resources, type, *rid);
                   if (rle == NULL)
                           return(NULL);
                   start = rle->start;
                   end = rle->end;
                   count = rle->count;
           }
   
           flags &= ~RF_ACTIVE;
           rm = nexus_rman(type);
           if (rm == NULL)
                   return (NULL);
   
           rv = rman_reserve_resource(rm, start, end, count, flags, child);
           if (rv == 0)
                   return 0;
           rman_set_rid(rv, *rid);
   
           if (needactivate) {
                   if (bus_activate_resource(child, type, *rid, rv)) {
                           rman_release_resource(rv);
                           return 0;
                   }
           }
   
           return rv;
   }
   
   static int
   nexus_adjust_resource(device_t bus, device_t child, int type,
       struct resource *r, u_long start, u_long end)
   {
           struct rman *rm;
   
           rm = nexus_rman(type);
           if (rm == NULL)
                   return (ENXIO);
           if (!rman_is_region_manager(r, rm))
                   return (EINVAL);
           return (rman_adjust_resource(r, start, end));
   }
   
   static int
   nexus_activate_resource(device_t bus, device_t child, int type, int rid,
                           struct resource *r)
   {
   #ifdef PC98
           bus_space_handle_t bh;
           int error;
   #endif
           void *vaddr;
   
           /*
            * If this is a memory resource, map it into the kernel.
            */
           switch (type) {
           case SYS_RES_IOPORT:
   #ifdef PC98
                   error = i386_bus_space_handle_alloc(X86_BUS_SPACE_IO,
                       rman_get_start(r), rman_get_size(r), &bh);
                   if (error)
                           return (error);
                   rman_set_bushandle(r, bh);
   #else
                   rman_set_bushandle(r, rman_get_start(r));
   #endif
                   rman_set_bustag(r, X86_BUS_SPACE_IO);
                   break;
           case SYS_RES_MEMORY:
   #ifdef PC98
                   error = i386_bus_space_handle_alloc(X86_BUS_SPACE_MEM,
                       rman_get_start(r), rman_get_size(r), &bh);
                   if (error)
                           return (error);
   #endif
                   vaddr = pmap_mapdev(rman_get_start(r), rman_get_size(r));
                   rman_set_virtual(r, vaddr);
                   rman_set_bustag(r, X86_BUS_SPACE_MEM);
   #ifdef PC98
                   /* PC-98: the type of bus_space_handle_t is the structure. */
                   bh->bsh_base = (bus_addr_t) vaddr;
                   rman_set_bushandle(r, bh);
   #else
                   /* IBM-PC: the type of bus_space_handle_t is u_int */
                   rman_set_bushandle(r, (bus_space_handle_t) vaddr);
   #endif
           }
           return (rman_activate_resource(r));
   }
   
   static int
   nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
                             struct resource *r)
   {
   
           /*
            * If this is a memory resource, unmap it.
            */
           if (type == SYS_RES_MEMORY) {
                   pmap_unmapdev((vm_offset_t)rman_get_virtual(r),
                       rman_get_size(r));
           }
   #ifdef PC98
           if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
                   bus_space_handle_t bh;
   
                   bh = rman_get_bushandle(r);
                   i386_bus_space_handle_free(rman_get_bustag(r), bh, bh->bsh_sz);
           }
   #endif
           return (rman_deactivate_resource(r));
   }
   
   static int
   nexus_release_resource(device_t bus, device_t child, int type, int rid,
                          struct resource *r)
   {
           if (rman_get_flags(r) & RF_ACTIVE) {
                   int error = bus_deactivate_resource(child, type, rid, r);
                   if (error)
                           return error;
           }
           return (rman_release_resource(r));
   }
   
   /*
    * Currently this uses the really grody interface from kern/kern_intr.c
    * (which really doesn't belong in kern/anything.c).  Eventually, all of
    * the code in kern_intr.c and machdep_intr.c should get moved here, since
    * this is going to be the official interface.
    */
   static int
   nexus_setup_intr(device_t bus, device_t child, struct resource *irq,
                    int flags, driver_filter_t filter, void (*ihand)(void *),
                    void *arg, void **cookiep)
   {
           int             error;
   
           /* somebody tried to setup an irq that failed to allocate! */
           if (irq == NULL)
                   panic("nexus_setup_intr: NULL irq resource!");
   
           *cookiep = 0;
           if ((rman_get_flags(irq) & RF_SHAREABLE) == 0)
                   flags |= INTR_EXCL;
   
           /*
            * We depend here on rman_activate_resource() being idempotent.
            */
           error = rman_activate_resource(irq);
           if (error)
                   return (error);
   
           error = intr_add_handler(device_get_nameunit(child),
               rman_get_start(irq), filter, ihand, arg, flags, cookiep);
   
           return (error);
   }
   
   static int
   nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
   {
           return (intr_remove_handler(ih));
   }
   
   #ifdef SMP
   static int
   nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
   {
           return (intr_bind(rman_get_start(irq), cpu));
   }
   #endif
   
   static int
   nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
       enum intr_polarity pol)
   {
           return (intr_config_intr(irq, trig, pol));
   }
   
   static int
   nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
       void *cookie, const char *descr)
   {
   
           return (intr_describe(rman_get_start(irq), cookie, descr));
   }
   
   static struct resource_list *
   nexus_get_reslist(device_t dev, device_t child)
   {
           struct nexus_device *ndev = DEVTONX(child);
   
           return (&ndev->nx_resources);
   }
   
   static int
   nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count)
   {
           struct nexus_device     *ndev = DEVTONX(child);
           struct resource_list    *rl = &ndev->nx_resources;
   
           /* XXX this should return a success/failure indicator */
           resource_list_add(rl, type, rid, start, start + count - 1, count);
           return(0);
   }
   
   static int
   nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp)
   {
           struct nexus_device     *ndev = DEVTONX(child);
           struct resource_list    *rl = &ndev->nx_resources;
           struct resource_list_entry *rle;
   
           rle = resource_list_find(rl, type, rid);
           if (!rle)
                   return(ENOENT);
           if (startp)
                   *startp = rle->start;
           if (countp)
                   *countp = rle->count;
           return(0);
   }
   
   static void
   nexus_delete_resource(device_t dev, device_t child, int type, int rid)
   {
           struct nexus_device     *ndev = DEVTONX(child);
           struct resource_list    *rl = &ndev->nx_resources;
   
           resource_list_delete(rl, type, rid);
   }
   
   /* Called from the MSI code to add new IRQs to the IRQ rman. */
   void
   nexus_add_irq(u_long irq)
   {
   
           if (rman_manage_region(&irq_rman, irq, irq) != 0)
                   panic("%s: failed", __func__);
   }
   
   #ifdef DEV_APIC
   static int
   nexus_alloc_msix(device_t pcib, device_t dev, int *irq)
   {
   
           return (msix_alloc(dev, irq));
   }
   
   static int
   nexus_release_msix(device_t pcib, device_t dev, int irq)
   {
   
           return (msix_release(irq));
   }
   
   static int
   nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
   {
   
           return (msi_alloc(dev, count, maxcount, irqs));
   }
   
   static int
   nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs)
   {
   
           return (msi_release(irqs, count));
   }
   
   static int
   nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data)
   {
   
           return (msi_map(irq, addr, data));
   }
   #endif
   
   /* Placeholder for system RAM. */
   static void
   ram_identify(driver_t *driver, device_t parent)
   {
   
           if (resource_disabled("ram", 0))
                   return; 
           if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL)
                   panic("ram_identify");
   }
   
   static int
   ram_probe(device_t dev)
   {
   
           device_quiet(dev);
           device_set_desc(dev, "System RAM");
           return (0);
   }
   
   static int
   ram_attach(device_t dev)
   {
           struct bios_smap *smapbase, *smap, *smapend;
           struct resource *res;
           vm_paddr_t *p;
           caddr_t kmdp;
           uint32_t smapsize;
           int error, rid;
   
           /* Retrieve the system memory map from the loader. */
           kmdp = preload_search_by_type("elf kernel");
           if (kmdp == NULL)
                   kmdp = preload_search_by_type(ELF_KERN_STR);  
           if (kmdp != NULL)
                   smapbase = (struct bios_smap *)preload_search_info(kmdp,
                       MODINFO_METADATA | MODINFOMD_SMAP);
           else
                   smapbase = NULL;
           if (smapbase != NULL) {
                   smapsize = *((u_int32_t *)smapbase - 1);
                   smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
   
                   rid = 0;
                   for (smap = smapbase; smap < smapend; smap++) {
                           if (smap->type != SMAP_TYPE_MEMORY ||
                               smap->length == 0)
                                   continue;
   #ifdef __i386__
                           /*
                            * Resources use long's to track resources, so
                            * we can't include memory regions above 4GB.
                            */
                           if (smap->base > ~0ul)
                                   continue;
   #endif
                           error = bus_set_resource(dev, SYS_RES_MEMORY, rid,
                               smap->base, smap->length);
                           if (error)
                                   panic(
                                       "ram_attach: resource %d failed set with %d",
                                       rid, error);
                           res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
                               0);
                           if (res == NULL)
                                   panic("ram_attach: resource %d failed to attach",
                                       rid);
                           rid++;
                   }
                   return (0);
           }
   
           /*
            * If the system map is not available, fall back to using
            * dump_avail[].  We use the dump_avail[] array rather than
            * phys_avail[] for the memory map as phys_avail[] contains
            * holes for kernel memory, page 0, the message buffer, and
            * the dcons buffer.  We test the end address in the loop
            * instead of the start since the start address for the first
            * segment is 0.
            */
           for (rid = 0, p = dump_avail; p[1] != 0; rid++, p += 2) {
   #ifdef PAE
                   /*
                    * Resources use long's to track resources, so we can't
                    * include memory regions above 4GB.
                    */
                   if (p[0] > ~0ul)
                           break;
   #endif
                   error = bus_set_resource(dev, SYS_RES_MEMORY, rid, p[0],
                       p[1] - p[0]);
                   if (error)
                           panic("ram_attach: resource %d failed set with %d", rid,
                               error);
                   res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
                   if (res == NULL)
                           panic("ram_attach: resource %d failed to attach", rid);
           }
           return (0);
   }
   
   static device_method_t ram_methods[] = {
           /* Device interface */
           DEVMETHOD(device_identify,      ram_identify),
           DEVMETHOD(device_probe,         ram_probe),
           DEVMETHOD(device_attach,        ram_attach),
           { 0, 0 }
   };
   
   static driver_t ram_driver = {
           "ram",
           ram_methods,
           1,              /* no softc */
   };
   
   static devclass_t ram_devclass;
   
   DRIVER_MODULE(ram, nexus, ram_driver, ram_devclass, 0, 0);
   
   #ifdef DEV_ISA
   /*
    * Placeholder which claims PnP 'devices' which describe system
    * resources.
    */
   static struct isa_pnp_id sysresource_ids[] = {
           { 0x010cd041 /* PNP0c01 */, "System Memory" },
           { 0x020cd041 /* PNP0c02 */, "System Resource" },
           { 0 }
   };
   
   static int
   sysresource_probe(device_t dev)
   {
           int     result;
   
           if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) {
                   device_quiet(dev);
           }
           return(result);
   }
   
   static int
   sysresource_attach(device_t dev)
   {
           return(0);
   }
   
   static device_method_t sysresource_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         sysresource_probe),
           DEVMETHOD(device_attach,        sysresource_attach),
           DEVMETHOD(device_detach,        bus_generic_detach),
           DEVMETHOD(device_shutdown,      bus_generic_shutdown),
           DEVMETHOD(device_suspend,       bus_generic_suspend),
           DEVMETHOD(device_resume,        bus_generic_resume),
           { 0, 0 }
   };
   
   static driver_t sysresource_driver = {
           "sysresource",
           sysresource_methods,
           1,              /* no softc */
   };
   
   static devclass_t sysresource_devclass;
   
   DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0);
   #endif /* DEV_ISA */

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