/* * 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/page.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, .smbios3 = 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; }