Put EFI machinery for Xen in place.
This patch is based on Jan Beulich and Tang Liang work.
v4 - suggestions/fixes:
- "just populate an efi_system_table_t object"
(suggested by Matt Fleming).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Signed-off-by: Tang Liang <liang.tang@xxxxxxxxxx>
Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
---
arch/x86/xen/enlighten.c | 26 ++++
drivers/xen/Kconfig | 3 +
drivers/xen/Makefile | 1 +
drivers/xen/efi.c | 374 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 404 insertions(+)
create mode 100644 drivers/xen/efi.c
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index c34bfc4..d5cc21f 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -32,6 +32,7 @@
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/edd.h>
+#include <linux/efi.h>
#include <xen/xen.h>
#include <xen/events.h>
@@ -150,6 +151,15 @@ struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
*/
static int have_vcpu_info_placement = 1;
+#ifdef CONFIG_XEN_EFI
+extern efi_system_table_t __init *xen_efi_probe(void);
+#else
+static efi_system_table_t __init *xen_efi_probe(void)
+{
+ return NULL;
+}
+#endif
+
struct tls_descs {
struct desc_struct desc[3];
};
@@ -1519,6 +1529,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
{
struct physdev_set_iopl set_iopl;
int rc;
+ efi_system_table_t *efi_systab_xen;
if (!xen_start_info)
return;
@@ -1714,6 +1725,21 @@ asmlinkage __visible void __init xen_start_kernel(void)
xen_setup_runstate_info(0);
+ efi_systab_xen = xen_efi_probe();
+
+ if (efi_systab_xen) {
+ strncpy((char *)&boot_params.efi_info.efi_loader_signature, "Xen",
+ sizeof(boot_params.efi_info.efi_loader_signature));
+ boot_params.efi_info.efi_systab = (__u32)((__u64)efi_systab_xen);
+ boot_params.efi_info.efi_systab_hi = (__u32)((__u64)efi_systab_xen >> 32);
+
+ x86_platform.get_wallclock = efi_get_time;
+ x86_platform.set_wallclock = efi_set_rtc_mmss;
+
+ set_bit(EFI_BOOT, &efi.flags);
+ set_bit(EFI_64BIT, &efi.flags);
+ }
+
/* Start the world */
#ifdef CONFIG_X86_32
i386_start_kernel();
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 38fb36e..cead283 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -240,4 +240,7 @@ config XEN_MCE_LOG
config XEN_HAVE_PVMMU
bool
+config XEN_EFI
+ def_bool X86_64 && EFI
+
endmenu
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 45e00af..c35de02 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -33,6 +33,7 @@ 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 0000000..d81458a
--- /dev/null
+++ b/drivers/xen/efi.c
@@ -0,0 +1,374 @@
+/*
+ * EFI support for Xen.
+ *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@xxxxxxxxxxx>
+ * Copyright (C) 1999-2002 Hewlett-Packard Co.
+ * David Mosberger-Tang <davidm@xxxxxxxxxx>
+ * Stephane Eranian <eranian@xxxxxxxxxx>
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu <fenghua.yu@xxxxxxxxx>
+ * Bibo Mao <bibo.mao@xxxxxxxxx>
+ * Chandramouli Narayanan <mouli@xxxxxxxxxxxxxxx>
+ * Huang Ying <ying.huang@xxxxxxxxx>
+ * Copyright (C) 2011 Novell Co.
+ * Jan Beulich <JBeulich@xxxxxxxx>
+ * Copyright (C) 2011-2012 Oracle Co.
+ * Liang Tang <liang.tang@xxxxxxxxxx>
+ * Copyright (c) 2014 Daniel Kiper, Oracle Corporation
+ */
+
+#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 <asm/xen/hypercall.h>
+
+#define call (op.u.efi_runtime_call)
+#define DECLARE_CALL(what) \
+ struct xen_platform_op op; \
+ op.cmd = XENPF_efi_runtime_call; \
+ call.function = XEN_EFI_##what; \
+ call.misc = 0
+
+static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
+{
+ int err;
+ DECLARE_CALL(get_time);
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.get_time.time));
+ memcpy(tm, &call.u.get_time.time, sizeof(*tm));
+ }
+
+ if (tc) {
+ tc->resolution = call.u.get_time.resolution;
+ tc->accuracy = call.u.get_time.accuracy;
+ tc->sets_to_zero = !!(call.misc &
+ XEN_EFI_GET_TIME_SET_CLEARS_NS);
+ }
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_set_time(efi_time_t *tm)
+{
+ DECLARE_CALL(set_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.set_time));
+ memcpy(&call.u.set_time, tm, sizeof(*tm));
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
+ efi_bool_t *pending,
+ efi_time_t *tm)
+{
+ int err;
+ DECLARE_CALL(get_wakeup_time);
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.get_wakeup_time));
+ memcpy(tm, &call.u.get_wakeup_time, sizeof(*tm));
+ }
+
+ if (enabled)
+ *enabled = !!(call.misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
+
+ if (pending)
+ *pending = !!(call.misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
+{
+ DECLARE_CALL(set_wakeup_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.set_wakeup_time));
+ if (enabled)
+ call.misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
+ if (tm)
+ memcpy(&call.u.set_wakeup_time, tm, sizeof(*tm));
+ else
+ call.misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.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)
+{
+ int err;
+ DECLARE_CALL(get_variable);
+
+ set_xen_guest_handle(call.u.get_variable.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(call.u.get_variable.vendor_guid));
+ memcpy(&call.u.get_variable.vendor_guid, vendor, sizeof(*vendor));
+ call.u.get_variable.size = *data_size;
+ set_xen_guest_handle(call.u.get_variable.data, data);
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *data_size = call.u.get_variable.size;
+ *attr = call.misc; /* misc in struction is U32 variable*/
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
+ efi_char16_t *name,
+ efi_guid_t *vendor)
+{
+ int err;
+ DECLARE_CALL(get_next_variable_name);
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+ call.u.get_next_variable_name.size = *name_size;
+ set_xen_guest_handle(call.u.get_next_variable_name.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(call.u.get_next_variable_name.vendor_guid));
+ memcpy(&call.u.get_next_variable_name.vendor_guid, vendor,
+ sizeof(*vendor));
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *name_size = call.u.get_next_variable_name.size;
+ memcpy(vendor, &call.u.get_next_variable_name.vendor_guid,
+ sizeof(*vendor));
+
+ return call.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)
+{
+ DECLARE_CALL(set_variable);
+
+ set_xen_guest_handle(call.u.set_variable.name, name);
+ call.misc = attr;
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(call.u.set_variable.vendor_guid));
+ memcpy(&call.u.set_variable.vendor_guid, vendor, sizeof(*vendor));
+ call.u.set_variable.size = data_size;
+ set_xen_guest_handle(call.u.set_variable.data, data);
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_query_variable_info(u32 attr,
+ u64 *storage_space,
+ u64 *remaining_space,
+ u64 *max_variable_size)
+{
+ int err;
+ DECLARE_CALL(query_variable_info);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *storage_space = call.u.query_variable_info.max_store_size;
+ *remaining_space = call.u.query_variable_info.remain_store_size;
+ *max_variable_size = call.u.query_variable_info.max_size;
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
+{
+ int err;
+ DECLARE_CALL(get_next_high_monotonic_count);
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *count = call.misc;
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
+ unsigned long count,
+ unsigned long sg_list)
+{
+ DECLARE_CALL(update_capsule);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(call.u.update_capsule.capsule_header_array,
+ capsules);
+ call.u.update_capsule.capsule_count = count;
+ call.u.update_capsule.sg_list = sg_list;
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
+ unsigned long count,
+ u64 *max_size,
+ int *reset_type)
+{
+ int err;
+ DECLARE_CALL(query_capsule_capabilities);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(call.u.query_capsule_capabilities.
+ capsule_header_array, capsules);
+ call.u.query_capsule_capabilities.capsule_count = count;
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *max_size = call.u.query_capsule_capabilities.max_capsule_size;
+ *reset_type = call.u.query_capsule_capabilities.reset_type;
+
+ return call.status;
+}
+
+#undef DECLARE_CALL
+#undef call
+
+static efi_char16_t vendor[100] __initdata;
+static const efi_char16_t unknown[] __initconst =
+ {'U', 'N', 'K', 'N', 'O', 'W', 'N', '\0'};
+
+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 = (unsigned long)unknown, /* 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 = NULL, /* Not used under Xen. */
+ .boottime = NULL, /* 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))
+ return NULL;
+
+ /* Here we know that Xen runs on EFI platform. */
+
+ efi = efi_xen;
+
+ 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)) {
+ efi_systab_xen.fw_vendor = (unsigned long)vendor;
+ efi_systab_xen.fw_revision = info->vendor.revision;
+ }
+
+ 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))
+ 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))
+ efi.runtime_version = info->version;
+
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+ op.u.firmware_info.index = XEN_FW_EFI_CONFIG_TABLE;
+
+ if (HYPERVISOR_dom0_op(&op))
+ BUG();
+
+ efi_systab_xen.tables = info->cfg.addr;
+ efi_systab_xen.nr_tables = info->cfg.nent;
+
+ return &efi_systab_xen;
+}
--
1.7.10.4
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