diff options
| -rw-r--r-- | include/Makefile | 4 | ||||
| -rw-r--r-- | sys/dev/acpica/acpi_hpet.c | 80 |
2 files changed, 83 insertions, 1 deletions
diff --git a/include/Makefile b/include/Makefile index f046bc16fc41..6c7a6a301b35 100644 --- a/include/Makefile +++ b/include/Makefile @@ -159,6 +159,8 @@ copies: cd ${.CURDIR}/../sys/dev/acpica; \ ${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 acpiio.h \ ${DESTDIR}${INCLUDEDIR}/dev/acpica + ${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 acpi_hpet.h \ + ${DESTDIR}${INCLUDEDIR}/dev/acpica cd ${.CURDIR}/../sys/dev/agp; \ ${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 agpreg.h \ ${DESTDIR}${INCLUDEDIR}/dev/agp @@ -243,7 +245,7 @@ symlinks: done .endfor cd ${.CURDIR}/../sys/dev/acpica; \ - for h in acpiio.h; do \ + for h in acpiio.h acpi_hpet.h; do \ ln -fs ../../../../sys/dev/acpica/$$h \ ${DESTDIR}${INCLUDEDIR}/dev/acpica; \ done diff --git a/sys/dev/acpica/acpi_hpet.c b/sys/dev/acpica/acpi_hpet.c index ae06406d6fbc..9204967da88c 100644 --- a/sys/dev/acpica/acpi_hpet.c +++ b/sys/dev/acpica/acpi_hpet.c @@ -35,11 +35,13 @@ __FBSDID("$FreeBSD$"); #include "opt_apic.h" #endif #include <sys/param.h> +#include <sys/conf.h> #include <sys/bus.h> #include <sys/kernel.h> #include <sys/module.h> #include <sys/proc.h> #include <sys/rman.h> +#include <sys/mman.h> #include <sys/time.h> #include <sys/smp.h> #include <sys/sysctl.h> @@ -106,6 +108,23 @@ struct hpet_softc { char name[8]; } t[32]; int num_timers; + struct cdev *pdev; + int mmap_allow; + int mmap_allow_write; + int devinuse; +}; + +static d_open_t hpet_open; +static d_close_t hpet_close; +static d_mmap_t hpet_mmap; + +static struct cdevsw hpet_cdevsw = { + .d_version = D_VERSION, + .d_flags = D_TRACKCLOSE, + .d_name = "hpet", + .d_open = hpet_open, + .d_close = hpet_close, + .d_mmap = hpet_mmap, }; static u_int hpet_get_timecount(struct timecounter *tc); @@ -317,6 +336,47 @@ hpet_find_irq_rid(device_t dev, u_long start, u_long end) } } +static int +hpet_open(struct cdev *cdev, int oflags, int devtype, struct thread *td) +{ + struct hpet_softc *sc; + + sc = cdev->si_drv1; + if (!sc->mmap_allow) + return (EPERM); + if (atomic_cmpset_32(&sc->devinuse, 0, 1) == 0) + return (EBUSY); + else + return (0); +} + +static int +hpet_close(struct cdev *cdev, int fflag, int devtype, struct thread *td) +{ + struct hpet_softc *sc; + + sc = cdev->si_drv1; + sc->devinuse = 0; + + return (0); +} + +static int +hpet_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr, + int nprot, vm_memattr_t *memattr) +{ + struct hpet_softc *sc; + + sc = cdev->si_drv1; + if (offset > rman_get_size(sc->mem_res)) + return (EINVAL); + if (!sc->mmap_allow_write && (nprot & PROT_WRITE)) + return (EPERM); + *paddr = rman_get_start(sc->mem_res) + offset; + + return (0); +} + /* Discover the HPET via the ACPI table of the same name. */ static void hpet_identify(driver_t *driver, device_t parent) @@ -701,6 +761,26 @@ hpet_attach(device_t dev) maxhpetet++; } } + + sc->pdev = make_dev(&hpet_cdevsw, 0, UID_ROOT, GID_WHEEL, + 0600, "hpet%d", device_get_unit(dev)); + if (sc->pdev) { + sc->pdev->si_drv1 = sc; + sc->mmap_allow = 1; + TUNABLE_INT_FETCH("hw.acpi.hpet.mmap_allow", + &sc->mmap_allow); + sc->mmap_allow_write = 1; + TUNABLE_INT_FETCH("hw.acpi.hpet.mmap_allow_write", + &sc->mmap_allow_write); + SYSCTL_ADD_INT(device_get_sysctl_ctx(dev), + SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), + OID_AUTO, "mmap_allow", + CTLFLAG_RW, &sc->mmap_allow, 0, + "Allow userland to memory map HPET"); + } else + device_printf(dev, "could not create /dev/hpet%d\n", + device_get_unit(dev)); + return (0); } |