[POWERPC] Add rtas_service_present() helper
To test for the existence of an RTAS function, we typically do:
foo_token = rtas_token("foo");
if (foo_token == RTAS_UNKNOWN_SERVICE)
return;
Add a rtas_service_present method, which provides a more conventional
boolean interface for testing the existence of an RTAS method.
Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 952f4c2..76b5d7e 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -303,6 +303,12 @@
}
EXPORT_SYMBOL(rtas_token);
+int rtas_service_present(const char *service)
+{
+ return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
+}
+EXPORT_SYMBOL(rtas_service_present);
+
#ifdef CONFIG_RTAS_ERROR_LOGGING
/*
* Return the firmware-specified size of the error log buffer
diff --git a/include/asm-powerpc/rtas.h b/include/asm-powerpc/rtas.h
index 031ef57..8eaa7b2 100644
--- a/include/asm-powerpc/rtas.h
+++ b/include/asm-powerpc/rtas.h
@@ -159,6 +159,7 @@
extern void enter_rtas(unsigned long);
extern int rtas_token(const char *service);
+extern int rtas_service_present(const char *service);
extern int rtas_call(int token, int, int, int *, ...);
extern void rtas_restart(char *cmd);
extern void rtas_power_off(void);