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[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>
hifive-unleashed-5.1
Nathan Lynch 2006-12-06 18:50:45 -06:00 committed by Paul Mackerras
parent 9d9d868ecf
commit f2d6d2d8bb
2 changed files with 7 additions and 0 deletions
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6
arch/powerpc/kernel/rtas.c
View File

@ -303,6 +303,12 @@ int rtas_token(const char *service)
}
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

1
include/asm-powerpc/rtas.h
View File

@ -159,6 +159,7 @@ extern struct rtas_t rtas;
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);