* This file is released under the GPLv2.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/efi.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/io.h>
+
+struct efi __read_mostly efi = {
+ .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,
+};
+EXPORT_SYMBOL(efi);
static struct kobject *efi_kobj;
static struct kobject *efivars_kobj;
}
subsys_initcall(efisubsys_init);
+
+
+/*
+ * We can't ioremap data in EFI boot services RAM, because we've already mapped
+ * it as RAM. So, look it up in the existing EFI memory map instead. Only
+ * callable after efi_enter_virtual_mode and before efi_free_boot_services.
+ */
+void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
+{
+ struct efi_memory_map *map;
+ void *p;
+ map = efi.memmap;
+ if (!map)
+ return NULL;
+ if (WARN_ON(!map->map))
+ return NULL;
+ for (p = map->map; p < map->map_end; p += map->desc_size) {
+ efi_memory_desc_t *md = p;
+ u64 size = md->num_pages << EFI_PAGE_SHIFT;
+ u64 end = md->phys_addr + size;
+ if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
+ md->type != EFI_BOOT_SERVICES_CODE &&
+ md->type != EFI_BOOT_SERVICES_DATA)
+ continue;
+ if (!md->virt_addr)
+ continue;
+ if (phys_addr >= md->phys_addr && phys_addr < end) {
+ phys_addr += md->virt_addr - md->phys_addr;
+ return (__force void __iomem *)(unsigned long)phys_addr;
+ }
+ }
+ return NULL;
+}
+
+static __initdata efi_config_table_type_t common_tables[] = {
+ {ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
+ {ACPI_TABLE_GUID, "ACPI", &efi.acpi},
+ {HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
+ {MPS_TABLE_GUID, "MPS", &efi.mps},
+ {SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
+ {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
+ {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
+ {NULL_GUID, NULL, NULL},
+};
+
+static __init int match_config_table(efi_guid_t *guid,
+ unsigned long table,
+ efi_config_table_type_t *table_types)
+{
+ u8 str[EFI_VARIABLE_GUID_LEN + 1];
+ int i;
+
+ if (table_types) {
+ efi_guid_unparse(guid, str);
+
+ for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
+ efi_guid_unparse(&table_types[i].guid, str);
+
+ if (!efi_guidcmp(*guid, table_types[i].guid)) {
+ *(table_types[i].ptr) = table;
+ pr_cont(" %s=0x%lx ",
+ table_types[i].name, table);
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+int __init efi_config_init(efi_config_table_type_t *arch_tables)
+{
+ void *config_tables, *tablep;
+ int i, sz;
+
+ if (efi_enabled(EFI_64BIT))
+ sz = sizeof(efi_config_table_64_t);
+ else
+ sz = sizeof(efi_config_table_32_t);
+
+ /*
+ * Let's see what config tables the firmware passed to us.
+ */
+ config_tables = early_memremap(efi.systab->tables,
+ efi.systab->nr_tables * sz);
+ if (config_tables == NULL) {
+ pr_err("Could not map Configuration table!\n");
+ return -ENOMEM;
+ }
+
+ tablep = config_tables;
+ pr_info("");
+ for (i = 0; i < efi.systab->nr_tables; i++) {
+ efi_guid_t guid;
+ unsigned long table;
+
+ if (efi_enabled(EFI_64BIT)) {
+ u64 table64;
+ guid = ((efi_config_table_64_t *)tablep)->guid;
+ table64 = ((efi_config_table_64_t *)tablep)->table;
+ table = table64;
+#ifndef CONFIG_64BIT
+ if (table64 >> 32) {
+ pr_cont("\n");
+ pr_err("Table located above 4GB, disabling EFI.\n");
+ early_iounmap(config_tables,
+ efi.systab->nr_tables * sz);
+ return -EINVAL;
+ }
+#endif
+ } else {
+ guid = ((efi_config_table_32_t *)tablep)->guid;
+ table = ((efi_config_table_32_t *)tablep)->table;
+ }
+
+ if (!match_config_table(&guid, table, common_tables))
+ match_config_table(&guid, table, arch_tables);
+
+ tablep += sz;
+ }
+ pr_cont("\n");
+ early_iounmap(config_tables, efi.systab->nr_tables * sz);
+ return 0;
+}
+
+#ifdef CONFIG_EFI_PARAMS_FROM_FDT
+
+#define UEFI_PARAM(name, prop, field) \
+ { \
+ { name }, \
+ { prop }, \
+ offsetof(struct efi_fdt_params, field), \
+ FIELD_SIZEOF(struct efi_fdt_params, field) \
+ }
+
+static __initdata struct {
+ const char name[32];
+ const char propname[32];
+ int offset;
+ int size;
+} dt_params[] = {
+ UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
+ UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
+ UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
+ UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
+ UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
+};
+
+struct param_info {
+ int verbose;
+ int found;
+ void *params;
+};
+
+static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
+ int depth, void *data)
+{
+ struct param_info *info = data;
+ const void *prop;
+ void *dest;
+ u64 val;
+ int i, len;
+
+ if (depth != 1 ||
+ (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
+ prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
+ if (!prop)
+ return 0;
+ dest = info->params + dt_params[i].offset;
+ info->found++;
+
+ val = of_read_number(prop, len / sizeof(u32));
+
+ if (dt_params[i].size == sizeof(u32))
+ *(u32 *)dest = val;
+ else
+ *(u64 *)dest = val;
+
+ if (info->verbose)
+ pr_info(" %s: 0x%0*llx\n", dt_params[i].name,
+ dt_params[i].size * 2, val);
+ }
+ return 1;
+}
+
+int __init efi_get_fdt_params(struct efi_fdt_params *params, int verbose)
+{
+ struct param_info info;
+ int ret;
+
+ pr_info("Getting EFI parameters from FDT:\n");
+
+ info.verbose = verbose;
+ info.found = 0;
+ info.params = params;
+
+ ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
+ if (!info.found)
+ pr_info("UEFI not found.\n");
+ else if (!ret)
+ pr_err("Can't find '%s' in device tree!\n",
+ dt_params[info.found].name);
+
+ return ret;
+}
+#endif /* CONFIG_EFI_PARAMS_FROM_FDT */
projects / firefly-linux-kernel-4.4.55.git / blobdiff