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acpi_sbl_wmi: add a driver to trigger SBL firmware updates
Expose a sysctl knob to inform the SBL bootloader that a firmware update is available and should be applied on the next reboot. See also: https://slimbootloader.github.io/security/firmware-update.html#triggering-firmware-update Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D47035
This commit is contained in:
Kristof Provost
parent
7bedae81ad
commit
96f1dfc1be
@ -758,6 +758,7 @@ dev/acpi_support/acpi_fujitsu.c optional acpi_fujitsu acpi
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dev/acpi_support/acpi_hp.c optional acpi_hp acpi
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dev/acpi_support/acpi_ibm.c optional acpi_ibm acpi
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dev/acpi_support/acpi_panasonic.c optional acpi_panasonic acpi
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dev/acpi_support/acpi_sbl_wmi.c optional acpi_sbl_wmi acpi
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dev/acpi_support/acpi_sony.c optional acpi_sony acpi
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dev/acpi_support/acpi_toshiba.c optional acpi_toshiba acpi
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dev/acpi_support/atk0110.c optional aibs acpi
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193
sys/dev/acpi_support/acpi_sbl_wmi.c
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193
sys/dev/acpi_support/acpi_sbl_wmi.c
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@ -0,0 +1,193 @@
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/*-
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* Copyright (c) 2024 Rubicon Communications, LLC (Netgate)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include "opt_acpi.h"
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/uio.h>
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/sbuf.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/accommon.h>
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#include <dev/acpica/acpivar.h>
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#include "acpi_wmi_if.h"
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#define _COMPONENT ACPI_OEM
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ACPI_MODULE_NAME("SBL-FW-UPDATE-WMI")
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ACPI_SERIAL_DECL(sbl_wmi, "SBL WMI device");
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#define ACPI_SBL_FW_UPDATE_WMI_GUID "44FADEB1-B204-40F2-8581-394BBDC1B651"
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struct acpi_sbl_wmi_softc {
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device_t dev;
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device_t wmi_dev;
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};
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static void
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acpi_sbl_wmi_identify(driver_t *driver, device_t parent)
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{
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/* Don't do anything if driver is disabled. */
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if (acpi_disabled("sbl_wmi"))
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return;
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/* Add only a single device instance. */
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if (device_find_child(parent, "acpi_sbl_wmi", -1) != NULL)
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return;
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/* Check management GUID to see whether system is compatible. */
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if (!ACPI_WMI_PROVIDES_GUID_STRING(parent,
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ACPI_SBL_FW_UPDATE_WMI_GUID))
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return;
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if (BUS_ADD_CHILD(parent, 0, "acpi_sbl_wmi", -1) == NULL)
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device_printf(parent, "add acpi_sbl_wmi child failed\n");
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}
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static int
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acpi_sbl_wmi_probe(device_t dev)
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{
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if (!ACPI_WMI_PROVIDES_GUID_STRING(device_get_parent(dev),
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ACPI_SBL_FW_UPDATE_WMI_GUID))
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return (EINVAL);
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device_set_desc(dev, "SBL Firmware Update WMI device");
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return (0);
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}
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static int
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acpi_sbl_wmi_sysctl_get(struct acpi_sbl_wmi_softc *sc, int *val)
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{
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ACPI_OBJECT *obj;
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ACPI_BUFFER out = { ACPI_ALLOCATE_BUFFER, NULL };
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int error = 0;
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if (ACPI_FAILURE(ACPI_WMI_GET_BLOCK(sc->wmi_dev,
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ACPI_SBL_FW_UPDATE_WMI_GUID, 0, &out))) {
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error = EINVAL;
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goto out;
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}
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obj = out.Pointer;
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if (obj->Type != ACPI_TYPE_INTEGER) {
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error = EINVAL;
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goto out;
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}
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*val = obj->Integer.Value;
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out:
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if (out.Pointer)
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AcpiOsFree(out.Pointer);
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return (error);
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}
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static int
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acpi_sbl_wmi_sysctl_set(struct acpi_sbl_wmi_softc *sc, int in)
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{
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ACPI_BUFFER input = { ACPI_ALLOCATE_BUFFER, NULL };
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uint32_t val;
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val = in;
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input.Length = sizeof(val);
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input.Pointer = &val;
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if (ACPI_FAILURE(ACPI_WMI_SET_BLOCK(sc->wmi_dev,
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ACPI_SBL_FW_UPDATE_WMI_GUID, 0, &input)))
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return (ENODEV);
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return (0);
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}
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static int
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acpi_sbl_wmi_fw_upgrade_sysctl(SYSCTL_HANDLER_ARGS)
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{
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struct acpi_sbl_wmi_softc *sc;
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int arg;
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int error = 0;
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ACPI_SERIAL_BEGIN(sbl_wmi);
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sc = (struct acpi_sbl_wmi_softc *)oidp->oid_arg1;
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error = acpi_sbl_wmi_sysctl_get(sc, &arg);
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if (error != 0)
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goto out;
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error = sysctl_handle_int(oidp, &arg, 0, req);
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if (! error && req->newptr != NULL)
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error = acpi_sbl_wmi_sysctl_set(sc, arg);
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out:
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ACPI_SERIAL_END(sbl_wmi);
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return (error);
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}
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static int
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acpi_sbl_wmi_attach(device_t dev)
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{
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struct acpi_sbl_wmi_softc *sc;
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struct sysctl_ctx_list *sysctl_ctx;
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struct sysctl_oid *sysctl_tree;
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sc = device_get_softc(dev);
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sc->dev = dev;
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sc->wmi_dev = device_get_parent(dev);
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sysctl_ctx = device_get_sysctl_ctx(dev);
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sysctl_tree = device_get_sysctl_tree(dev);
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SYSCTL_ADD_PROC(sysctl_ctx,
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SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
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"firmware_update_request",
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
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sc, 0, acpi_sbl_wmi_fw_upgrade_sysctl, "I",
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"Signal SBL that a firmware update is available");
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return (0);
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}
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static device_method_t acpi_sbl_wmi_methods[] = {
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DEVMETHOD(device_identify, acpi_sbl_wmi_identify),
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DEVMETHOD(device_probe, acpi_sbl_wmi_probe),
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DEVMETHOD(device_attach, acpi_sbl_wmi_attach),
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DEVMETHOD_END
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};
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static driver_t acpi_sbl_wmi_driver = {
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"acpi_sbl_wmi",
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acpi_sbl_wmi_methods,
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sizeof(struct acpi_sbl_wmi_softc),
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};
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DRIVER_MODULE(acpi_sbl_wmi, acpi_wmi, acpi_sbl_wmi_driver, 0, 0);
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MODULE_DEPEND(acpi_sbl_wmi, acpi_wmi, 1, 1, 1);
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MODULE_DEPEND(acpi_sbl_wmi, acpi, 1, 1, 1);
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@ -1,5 +1,5 @@
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SUBDIR= acpi_asus acpi_asus_wmi acpi_dock acpi_fujitsu acpi_hp \
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acpi_ged acpi_ibm acpi_panasonic acpi_sony acpi_toshiba \
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acpi_video acpi_wmi aibs
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acpi_ged acpi_ibm acpi_panasonic acpi_sbl_wmi acpi_sony \
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acpi_toshiba acpi_video acpi_wmi aibs
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.include <bsd.subdir.mk>
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7
sys/modules/acpi/acpi_sbl_wmi/Makefile
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7
sys/modules/acpi/acpi_sbl_wmi/Makefile
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@ -0,0 +1,7 @@
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.PATH: ${SRCTOP}/sys/dev/acpi_support
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KMOD= acpi_sbl_wmi
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CFLAGS+=-I${SRCTOP}/sys/dev/acpi_support
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SRCS= acpi_sbl_wmi.c opt_acpi.h acpi_if.h acpi_wmi_if.h device_if.h bus_if.h
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.include <bsd.kmod.mk>
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@ -172,6 +172,9 @@ device acpi_ibm
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# ACPI Panasonic Extras (LCD backlight/brightness, video output, etc.)
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device acpi_panasonic
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# ACPI SBL Firmware Update
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device acpi_sbl_wmi
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# ACPI Sony extra (LCD brightness)
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device acpi_sony
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