acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state) { union acpi_operand_object *string_desc; union acpi_operand_object *return_desc; struct acpi_interface_info *interface_info; acpi_interface_handler interface_handler; u32 return_value; ACPI_FUNCTION_TRACE(ut_osi_implementation); string_desc = walk_state->arguments[0].object; if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) { return_ACPI_STATUS(AE_TYPE); } return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); if (!return_desc) { return_ACPI_STATUS(AE_NO_MEMORY); } return_value = 0; (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER); interface_info = acpi_ut_get_interface(string_desc->string.pointer); if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) { if (interface_info->value > acpi_gbl_osi_data) { acpi_gbl_osi_data = interface_info->value; } return_value = ACPI_UINT32_MAX; } acpi_os_release_mutex(acpi_gbl_osi_mutex); interface_handler = acpi_gbl_interface_handler; if (interface_handler) { return_value = interface_handler(string_desc->string.pointer, return_value); } ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, "ACPI: BIOS _OSI(\"%s\") is %ssupported\n", string_desc->string.pointer, return_value == 0 ? "not " : "")); return_desc->integer.value = return_value; walk_state->return_desc = return_desc; return_ACPI_STATUS(AE_OK); }
/***************************************************************************** * * FUNCTION: acpi_install_interface * * PARAMETERS: interface_name - The interface to install * * RETURN: Status * * DESCRIPTION: Install an _OSI interface to the global list * ****************************************************************************/ acpi_status acpi_install_interface(acpi_string interface_name) { acpi_status status; struct acpi_interface_info *interface_info; /* Parameter validation */ if (!interface_name || (strlen(interface_name) == 0)) { return (AE_BAD_PARAMETER); } status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER); if (ACPI_FAILURE(status)) { return (status); } /* Check if the interface name is already in the global list */ interface_info = acpi_ut_get_interface(interface_name); if (interface_info) { /* * The interface already exists in the list. This is OK if the * interface has been marked invalid -- just clear the bit. */ if (interface_info->flags & ACPI_OSI_INVALID) { interface_info->flags &= ~ACPI_OSI_INVALID; status = AE_OK; } else { status = AE_ALREADY_EXISTS; } } else { /* New interface name, install into the global list */ status = acpi_ut_install_interface(interface_name); } acpi_os_release_mutex(acpi_gbl_osi_mutex); return (status); }
acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state) { union acpi_operand_object *string_desc; union acpi_operand_object *return_desc; struct acpi_interface_info *interface_info; acpi_interface_handler interface_handler; acpi_status status; u32 return_value; ACPI_FUNCTION_TRACE(ut_osi_implementation); /* Validate the string input argument (from the AML caller) */ string_desc = walk_state->arguments[0].object; if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) { return_ACPI_STATUS(AE_TYPE); } /* Create a return object */ return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); if (!return_desc) { return_ACPI_STATUS(AE_NO_MEMORY); } /* Default return value is 0, NOT SUPPORTED */ return_value = 0; status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER); if (ACPI_FAILURE(status)) { acpi_ut_remove_reference(return_desc); return_ACPI_STATUS(status); } /* Lookup the interface in the global _OSI list */ interface_info = acpi_ut_get_interface(string_desc->string.pointer); if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) { /* * The interface is supported. * Update the osi_data if necessary. We keep track of the latest * version of Windows that has been requested by the BIOS. */ if (interface_info->value > acpi_gbl_osi_data) { acpi_gbl_osi_data = interface_info->value; } return_value = ACPI_UINT32_MAX; } acpi_os_release_mutex(acpi_gbl_osi_mutex); /* * Invoke an optional _OSI interface handler. The host OS may wish * to do some interface-specific handling. For example, warn about * certain interfaces or override the true/false support value. */ interface_handler = acpi_gbl_interface_handler; if (interface_handler) { return_value = interface_handler(string_desc->string.pointer, return_value); } ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, "ACPI: BIOS _OSI(\"%s\") is %ssupported\n", string_desc->string.pointer, return_value == 0 ? "not " : "")); /* Complete the return object */ return_desc->integer.value = return_value; walk_state->return_desc = return_desc; return_ACPI_STATUS(AE_OK); }