summaryrefslogtreecommitdiffstats
path: root/drivers/xen
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2014-08-04 17:13:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-04 17:13:50 -0700
commit76f09aa464a1913efd596dd0edbf88f932fde08c (patch)
treece9aadc9a1c30597b9d61c7aac86bfb2e6caf961 /drivers/xen
parente9c9eecabaa898ff3fedd98813ee4ac1a00d006a (diff)
parent99a5603e2a1f146ac0c6414d8a3669aa749ccff8 (diff)
downloadlinux-76f09aa464a1913efd596dd0edbf88f932fde08c.tar.bz2
Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI changes from Ingo Molnar: "Main changes in this cycle are: - arm64 efi stub fixes, preservation of FP/SIMD registers across firmware calls, and conversion of the EFI stub code into a static library - Ard Biesheuvel - Xen EFI support - Daniel Kiper - Support for autoloading the efivars driver - Lee, Chun-Yi - Use the PE/COFF headers in the x86 EFI boot stub to request that the stub be loaded with CONFIG_PHYSICAL_ALIGN alignment - Michael Brown - Consolidate all the x86 EFI quirks into one file - Saurabh Tangri - Additional error logging in x86 EFI boot stub - Ulf Winkelvos - Support loading initrd above 4G in EFI boot stub - Yinghai Lu - EFI reboot patches for ACPI hardware reduced platforms" * 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (31 commits) efi/arm64: Handle missing virtual mapping for UEFI System Table arch/x86/xen: Silence compiler warnings xen: Silence compiler warnings x86/efi: Request desired alignment via the PE/COFF headers x86/efi: Add better error logging to EFI boot stub efi: Autoload efivars efi: Update stale locking comment for struct efivars arch/x86: Remove efi_set_rtc_mmss() arch/x86: Replace plain strings with constants xen: Put EFI machinery in place xen: Define EFI related stuff arch/x86: Remove redundant set_bit(EFI_MEMMAP) call arch/x86: Remove redundant set_bit(EFI_SYSTEM_TABLES) call efi: Introduce EFI_PARAVIRT flag arch/x86: Do not access EFI memory map if it is not available efi: Use early_mem*() instead of early_io*() arch/ia64: Define early_memunmap() x86/reboot: Add EFI reboot quirk for ACPI Hardware Reduced flag efi/reboot: Allow powering off machines using EFI efi/reboot: Add generic wrapper around EfiResetSystem() ...
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/Kconfig4
-rw-r--r--drivers/xen/Makefile3
-rw-r--r--drivers/xen/efi.c368
3 files changed, 375 insertions, 0 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 38fb36e1c592..8bc01838daf9 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -240,4 +240,8 @@ config XEN_MCE_LOG
config XEN_HAVE_PVMMU
bool
+config XEN_EFI
+ def_bool y
+ depends on X86_64 && EFI
+
endmenu
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 45e00afa7f2d..84044b554e33 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -9,6 +9,8 @@ obj-y += xenbus/
nostackp := $(call cc-option, -fno-stack-protector)
CFLAGS_features.o := $(nostackp)
+CFLAGS_efi.o += -fshort-wchar
+
dom0-$(CONFIG_PCI) += pci.o
dom0-$(CONFIG_USB_SUPPORT) += dbgp.o
dom0-$(CONFIG_ACPI) += acpi.o $(xen-pad-y)
@@ -33,6 +35,7 @@ obj-$(CONFIG_XEN_STUB) += xen-stub.o
obj-$(CONFIG_XEN_ACPI_HOTPLUG_MEMORY) += xen-acpi-memhotplug.o
obj-$(CONFIG_XEN_ACPI_HOTPLUG_CPU) += xen-acpi-cpuhotplug.o
obj-$(CONFIG_XEN_ACPI_PROCESSOR) += xen-acpi-processor.o
+obj-$(CONFIG_XEN_EFI) += efi.o
xen-evtchn-y := evtchn.o
xen-gntdev-y := gntdev.o
xen-gntalloc-y := gntalloc.o
diff --git a/drivers/xen/efi.c b/drivers/xen/efi.c
new file mode 100644
index 000000000000..31f618a49661
--- /dev/null
+++ b/drivers/xen/efi.c
@@ -0,0 +1,368 @@
+/*
+ * EFI support for Xen.
+ *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999-2002 Hewlett-Packard Co.
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ * Stephane Eranian <eranian@hpl.hp.com>
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu <fenghua.yu@intel.com>
+ * Bibo Mao <bibo.mao@intel.com>
+ * Chandramouli Narayanan <mouli@linux.intel.com>
+ * Huang Ying <ying.huang@intel.com>
+ * Copyright (C) 2011 Novell Co.
+ * Jan Beulich <JBeulich@suse.com>
+ * Copyright (C) 2011-2012 Oracle Co.
+ * Liang Tang <liang.tang@oracle.com>
+ * Copyright (c) 2014 Oracle Co., Daniel Kiper
+ */
+
+#include <linux/bug.h>
+#include <linux/efi.h>
+#include <linux/init.h>
+#include <linux/string.h>
+
+#include <xen/interface/xen.h>
+#include <xen/interface/platform.h>
+#include <xen/xen.h>
+
+#include <asm/xen/hypercall.h>
+
+#define INIT_EFI_OP(name) \
+ {.cmd = XENPF_efi_runtime_call, \
+ .u.efi_runtime_call.function = XEN_EFI_##name, \
+ .u.efi_runtime_call.misc = 0}
+
+#define efi_data(op) (op.u.efi_runtime_call)
+
+static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_time);
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
+ memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
+ }
+
+ if (tc) {
+ tc->resolution = efi_data(op).u.get_time.resolution;
+ tc->accuracy = efi_data(op).u.get_time.accuracy;
+ tc->sets_to_zero = !!(efi_data(op).misc &
+ XEN_EFI_GET_TIME_SET_CLEARS_NS);
+ }
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_set_time(efi_time_t *tm)
+{
+ struct xen_platform_op op = INIT_EFI_OP(set_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
+ memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
+ efi_bool_t *pending,
+ efi_time_t *tm)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
+ memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
+ }
+
+ if (enabled)
+ *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
+
+ if (pending)
+ *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
+{
+ struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
+ if (enabled)
+ efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
+ if (tm)
+ memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
+ else
+ efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_get_variable(efi_char16_t *name,
+ efi_guid_t *vendor,
+ u32 *attr,
+ unsigned long *data_size,
+ void *data)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_variable);
+
+ set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(efi_data(op).u.get_variable.vendor_guid));
+ memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
+ efi_data(op).u.get_variable.size = *data_size;
+ set_xen_guest_handle(efi_data(op).u.get_variable.data, data);
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *data_size = efi_data(op).u.get_variable.size;
+ if (attr)
+ *attr = efi_data(op).misc;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
+ efi_char16_t *name,
+ efi_guid_t *vendor)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
+
+ efi_data(op).u.get_next_variable_name.size = *name_size;
+ set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
+ memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
+ sizeof(*vendor));
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *name_size = efi_data(op).u.get_next_variable_name.size;
+ memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
+ sizeof(*vendor));
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_set_variable(efi_char16_t *name,
+ efi_guid_t *vendor,
+ u32 attr,
+ unsigned long data_size,
+ void *data)
+{
+ struct xen_platform_op op = INIT_EFI_OP(set_variable);
+
+ set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
+ efi_data(op).misc = attr;
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(efi_data(op).u.set_variable.vendor_guid));
+ memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
+ efi_data(op).u.set_variable.size = data_size;
+ set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_query_variable_info(u32 attr,
+ u64 *storage_space,
+ u64 *remaining_space,
+ u64 *max_variable_size)
+{
+ struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ efi_data(op).u.query_variable_info.attr = attr;
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *storage_space = efi_data(op).u.query_variable_info.max_store_size;
+ *remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
+ *max_variable_size = efi_data(op).u.query_variable_info.max_size;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *count = efi_data(op).misc;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
+ unsigned long count,
+ unsigned long sg_list)
+{
+ struct xen_platform_op op = INIT_EFI_OP(update_capsule);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
+ capsules);
+ efi_data(op).u.update_capsule.capsule_count = count;
+ efi_data(op).u.update_capsule.sg_list = sg_list;
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
+ unsigned long count,
+ u64 *max_size,
+ int *reset_type)
+{
+ struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
+ capsules);
+ efi_data(op).u.query_capsule_capabilities.capsule_count = count;
+
+ if (HYPERVISOR_dom0_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
+ *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
+
+ return efi_data(op).status;
+}
+
+static efi_char16_t vendor[100] __initdata;
+
+static efi_system_table_t efi_systab_xen __initdata = {
+ .hdr = {
+ .signature = EFI_SYSTEM_TABLE_SIGNATURE,
+ .revision = 0, /* Initialized later. */
+ .headersize = 0, /* Ignored by Linux Kernel. */
+ .crc32 = 0, /* Ignored by Linux Kernel. */
+ .reserved = 0
+ },
+ .fw_vendor = EFI_INVALID_TABLE_ADDR, /* Initialized later. */
+ .fw_revision = 0, /* Initialized later. */
+ .con_in_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+ .con_in = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+ .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+ .con_out = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+ .stderr_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+ .stderr = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+ .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
+ /* Not used under Xen. */
+ .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
+ /* Not used under Xen. */
+ .nr_tables = 0, /* Initialized later. */
+ .tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */
+};
+
+static const struct efi efi_xen __initconst = {
+ .systab = NULL, /* Initialized later. */
+ .runtime_version = 0, /* Initialized later. */
+ .mps = EFI_INVALID_TABLE_ADDR,
+ .acpi = EFI_INVALID_TABLE_ADDR,
+ .acpi20 = EFI_INVALID_TABLE_ADDR,
+ .smbios = EFI_INVALID_TABLE_ADDR,
+ .sal_systab = EFI_INVALID_TABLE_ADDR,
+ .boot_info = EFI_INVALID_TABLE_ADDR,
+ .hcdp = EFI_INVALID_TABLE_ADDR,
+ .uga = EFI_INVALID_TABLE_ADDR,
+ .uv_systab = EFI_INVALID_TABLE_ADDR,
+ .fw_vendor = EFI_INVALID_TABLE_ADDR,
+ .runtime = EFI_INVALID_TABLE_ADDR,
+ .config_table = EFI_INVALID_TABLE_ADDR,
+ .get_time = xen_efi_get_time,
+ .set_time = xen_efi_set_time,
+ .get_wakeup_time = xen_efi_get_wakeup_time,
+ .set_wakeup_time = xen_efi_set_wakeup_time,
+ .get_variable = xen_efi_get_variable,
+ .get_next_variable = xen_efi_get_next_variable,
+ .set_variable = xen_efi_set_variable,
+ .query_variable_info = xen_efi_query_variable_info,
+ .update_capsule = xen_efi_update_capsule,
+ .query_capsule_caps = xen_efi_query_capsule_caps,
+ .get_next_high_mono_count = xen_efi_get_next_high_mono_count,
+ .reset_system = NULL, /* Functionality provided by Xen. */
+ .set_virtual_address_map = NULL, /* Not used under Xen. */
+ .memmap = NULL, /* Not used under Xen. */
+ .flags = 0 /* Initialized later. */
+};
+
+efi_system_table_t __init *xen_efi_probe(void)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_firmware_info,
+ .u.firmware_info = {
+ .type = XEN_FW_EFI_INFO,
+ .index = XEN_FW_EFI_CONFIG_TABLE
+ }
+ };
+ union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
+
+ if (!xen_initial_domain() || HYPERVISOR_dom0_op(&op) < 0)
+ return NULL;
+
+ /* Here we know that Xen runs on EFI platform. */
+
+ efi = efi_xen;
+
+ efi_systab_xen.tables = info->cfg.addr;
+ efi_systab_xen.nr_tables = info->cfg.nent;
+
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+ op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
+ info->vendor.bufsz = sizeof(vendor);
+ set_xen_guest_handle(info->vendor.name, vendor);
+
+ if (HYPERVISOR_dom0_op(&op) == 0) {
+ efi_systab_xen.fw_vendor = __pa_symbol(vendor);
+ efi_systab_xen.fw_revision = info->vendor.revision;
+ } else
+ efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");
+
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+ op.u.firmware_info.index = XEN_FW_EFI_VERSION;
+
+ if (HYPERVISOR_dom0_op(&op) == 0)
+ efi_systab_xen.hdr.revision = info->version;
+
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+ op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
+
+ if (HYPERVISOR_dom0_op(&op) == 0)
+ efi.runtime_version = info->version;
+
+ return &efi_systab_xen;
+}