efi_loader: implement ConvertPointer()

Implement the ConvertPointer() runtime service.

Suggested-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index a8f0b5eae3b06eae33da68f043d3911535139951..fb2413146200a428b3b8347dade6097a4e96aa73 100644 (file)
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -81,6 +81,10 @@ struct elf_rela {
        long addend;
 };
 
+static __efi_runtime_data struct efi_mem_desc *efi_virtmap;
+static __efi_runtime_data efi_uintn_t efi_descriptor_count;
+static __efi_runtime_data efi_uintn_t efi_descriptor_size;
+
 /*
  * EFI runtime code lives in two stages. In the first stage, U-Boot and an EFI
  * payload are running concurrently at the same time. In this mode, we can
@@ -89,7 +93,9 @@ struct elf_rela {
 
 efi_status_t efi_init_runtime_supported(void)
 {
-       u16 efi_runtime_services_supported = 0;
+       u16 efi_runtime_services_supported =
+                               EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP |
+                               EFI_RT_SUPPORTED_CONVERT_POINTER;
 
        /*
         * This value must be synced with efi_runtime_detach_list
@@ -98,8 +104,7 @@ efi_status_t efi_init_runtime_supported(void)
 #ifdef CONFIG_EFI_HAVE_RUNTIME_RESET
        efi_runtime_services_supported |= EFI_RT_SUPPORTED_RESET_SYSTEM;
 #endif
-       efi_runtime_services_supported |=
-                               EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP;
+
        return EFI_CALL(efi_set_variable(L"RuntimeServicesSupported",
                                         &efi_global_variable_guid,
                                         EFI_VARIABLE_BOOTSERVICE_ACCESS |
@@ -454,6 +459,58 @@ static __efi_runtime efi_status_t EFIAPI efi_convert_pointer_runtime(
        return EFI_UNSUPPORTED;
 }
 
+/**
+ * efi_convert_pointer_runtime() - convert from physical to virtual pointer
+ *
+ * This function implements the ConvertPointer() runtime service until
+ * the first call to SetVirtualAddressMap().
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @debug_disposition: indicates if pointer may be converted to NULL
+ * @address:           pointer to be converted
+ * Return:             status code EFI_UNSUPPORTED
+ */
+static __efi_runtime efi_status_t EFIAPI efi_convert_pointer(
+                       efi_uintn_t debug_disposition, void **address)
+{
+       efi_physical_addr_t addr = (uintptr_t)*address;
+       efi_uintn_t i;
+       efi_status_t ret = EFI_NOT_FOUND;
+
+       EFI_ENTRY("%zu %p", debug_disposition, address);
+
+       if (!efi_virtmap) {
+               ret = EFI_UNSUPPORTED;
+               goto out;
+       }
+
+       if (!address) {
+               ret = EFI_INVALID_PARAMETER;
+               goto out;
+       }
+
+       for (i = 0; i < efi_descriptor_count; i++) {
+               struct efi_mem_desc *map = (void *)efi_virtmap +
+                                          (efi_descriptor_size * i);
+
+               if (addr >= map->physical_start &&
+                   (addr < map->physical_start
+                           + (map->num_pages << EFI_PAGE_SHIFT))) {
+                       *address = (void *)(uintptr_t)
+                                  (addr + map->virtual_start -
+                                   map->physical_start);
+
+                       ret = EFI_SUCCESS;
+                       break;
+               }
+       }
+
+out:
+       return EFI_EXIT(ret);
+}
+
 static __efi_runtime void efi_relocate_runtime_table(ulong offset)
 {
        ulong patchoff;
@@ -480,6 +537,12 @@ static __efi_runtime void efi_relocate_runtime_table(ulong offset)
         */
        efi_runtime_services.convert_pointer = &efi_convert_pointer_runtime;
 
+       /*
+        * TODO: Update UEFI variable RuntimeServicesSupported removing flags
+        * EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP and
+        * EFI_RT_SUPPORTED_CONVERT_POINTER as required by the UEFI spec 2.8.
+        */
+
        /* Update CRC32 */
        efi_update_table_header_crc32(&efi_runtime_services.hdr);
 }
@@ -584,6 +647,10 @@ static efi_status_t EFIAPI efi_set_virtual_address_map(
        EFI_ENTRY("%zx %zx %x %p", memory_map_size, descriptor_size,
                  descriptor_version, virtmap);
 
+       efi_virtmap = virtmap;
+       efi_descriptor_size = descriptor_size;
+       efi_descriptor_count = n;
+
        /*
         * TODO:
         * Further down we are cheating. While really we should implement
@@ -800,7 +867,7 @@ struct efi_runtime_services __efi_runtime_data efi_runtime_services = {
        .get_wakeup_time = (void *)&efi_unimplemented,
        .set_wakeup_time = (void *)&efi_unimplemented,
        .set_virtual_address_map = &efi_set_virtual_address_map,
-       .convert_pointer = (void *)&efi_unimplemented,
+       .convert_pointer = efi_convert_pointer,
        .get_variable = efi_get_variable,
        .get_next_variable_name = efi_get_next_variable_name,
        .set_variable = efi_set_variable,