Add a new ram0 pseudo-device that claims memory resouces for physical
addresses corresponding to system RAM. On amd64 ram0 uses the SMAP and claims all the type 1 SMAP regions. On i386 ram0 uses the dump_avail[] array. Note that on i386 we have to ignore regions above 4G in PAE kernels since bus resources use longs.
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jhb
parent
d7f955fd67
commit
9c3aae9403
@ -47,6 +47,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/linker.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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@ -59,7 +60,9 @@ __FBSDID("$FreeBSD$");
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#include <vm/pmap.h>
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#include <machine/pmap.h>
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#include <machine/metadata.h>
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#include <machine/resource.h>
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#include <machine/pc/bios.h>
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#include "pcib_if.h"
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@ -550,6 +553,79 @@ nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs)
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return (msi_release(irqs, count));
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}
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/* Placeholder for system RAM. */
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static void
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ram_identify(driver_t *driver, device_t parent)
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{
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if (resource_disabled("ram", 0))
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return;
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if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL)
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panic("ram_identify");
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}
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static int
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ram_probe(device_t dev)
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{
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device_quiet(dev);
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device_set_desc(dev, "System RAM");
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return (0);
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}
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static int
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ram_attach(device_t dev)
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{
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struct bios_smap *smapbase, *smap, *smapend;
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struct resource *res;
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caddr_t kmdp;
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uint32_t smapsize;
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int error, rid;
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/* Retrieve the system memory map from the loader. */
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kmdp = preload_search_by_type("elf kernel");
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if (kmdp == NULL)
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kmdp = preload_search_by_type("elf64 kernel");
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smapbase = (struct bios_smap *)preload_search_info(kmdp,
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MODINFO_METADATA | MODINFOMD_SMAP);
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smapsize = *((u_int32_t *)smapbase - 1);
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smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
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rid = 0;
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for (smap = smapbase; smap < smapend; smap++) {
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if (smap->type != 0x01 || smap->length == 0)
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continue;
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error = bus_set_resource(dev, SYS_RES_MEMORY, rid, smap->base,
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smap->length);
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if (error)
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panic("ram_attach: resource %d failed set with %d", rid,
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error);
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res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
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if (res == NULL)
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panic("ram_attach: resource %d failed to attach", rid);
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rid++;
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}
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return (0);
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}
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static device_method_t ram_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, ram_identify),
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DEVMETHOD(device_probe, ram_probe),
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DEVMETHOD(device_attach, ram_attach),
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{ 0, 0 }
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};
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static driver_t ram_driver = {
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"ram",
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ram_methods,
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1, /* no softc */
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};
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static devclass_t ram_devclass;
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DRIVER_MODULE(ram, nexus, ram_driver, ram_devclass, 0, 0);
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#ifdef DEV_ISA
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/*
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* Placeholder which claims PnP 'devices' which describe system
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@ -607,6 +607,84 @@ nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs)
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}
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#endif
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/* Placeholder for system RAM. */
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static void
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ram_identify(driver_t *driver, device_t parent)
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{
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if (resource_disabled("ram", 0))
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return;
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if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL)
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panic("ram_identify");
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}
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static int
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ram_probe(device_t dev)
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{
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device_quiet(dev);
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device_set_desc(dev, "System RAM");
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return (0);
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}
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static int
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ram_attach(device_t dev)
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{
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struct resource *res;
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vm_paddr_t *p;
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int error, i, rid;
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/*
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* We use the dump_avail[] array rather than phys_avail[] for
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* the memory map as phys_avail[] contains holes for kernel
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* memory, page 0, the message buffer, and the dcons buffer.
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* We test the end address in the loop instead of the start
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* since the start address for the first segment is 0.
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*
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* XXX: It would be preferable to use the SMAP if it exists
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* instead since if the SMAP is very fragmented we may not
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* include some memory regions in dump_avail[] and phys_avail[].
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*/
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for (i = 0, p = dump_avail; p[1] != 0; i++, p += 2) {
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rid = i;
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#ifdef PAE
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/*
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* Resources use long's to track resources, so we can't
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* include memory regions above 4GB.
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*/
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if (p[0] >= ~0ul)
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break;
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#endif
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error = bus_set_resource(dev, SYS_RES_MEMORY, rid, p[0],
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p[1] - p[0]);
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if (error)
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panic("ram_attach: resource %d failed set with %d", i,
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error);
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res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0);
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if (res == NULL)
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panic("ram_attach: resource %d failed to attach", i);
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}
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return (0);
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}
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static device_method_t ram_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, ram_identify),
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DEVMETHOD(device_probe, ram_probe),
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DEVMETHOD(device_attach, ram_attach),
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{ 0, 0 }
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};
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static driver_t ram_driver = {
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"ram",
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ram_methods,
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1, /* no softc */
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};
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static devclass_t ram_devclass;
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DRIVER_MODULE(ram, nexus, ram_driver, ram_devclass, 0, 0);
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#ifdef DEV_ISA
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/*
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* Placeholder which claims PnP 'devices' which describe system
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