powerpc/boot: Add byteswapping routines in oflib

Values will need to be byte-swapped when calling prom (big endian) from
a little endian boot wrapper.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 11 insertions, 11 deletions

diff --git a/arch/powerpc/boot/oflib.c b/arch/powerpc/boot/oflib.c
index 3b0c9458504f..0f72b1a42133 100644
--- a/arch/powerpc/boot/oflib.c
+++ b/arch/powerpc/boot/oflib.c
@@ -42,13 +42,13 @@ int of_call_prom(const char *service, int nargs, int nret, ...)
         struct prom_args args;
         va_list list;
 
-        args.service = ADDR(service);
-        args.nargs = nargs;
-        args.nret = nret;
+        args.service = cpu_to_be32(ADDR(service));
+        args.nargs = cpu_to_be32(nargs);
+        args.nret = cpu_to_be32(nret);
 
         va_start(list, nret);
         for (i = 0; i < nargs; i++)
-                args.args[i] = va_arg(list, prom_arg_t);
+                args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
         va_end(list);
 
         for (i = 0; i < nret; i++)
@@ -57,7 +57,7 @@ int of_call_prom(const char *service, int nargs, int nret, ...)
         if (prom(&args) < 0)
                 return -1;
 
-        return (nret > 0)? args.args[nargs]: 0;
+        return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
 }
 
 static int of_call_prom_ret(const char *service, int nargs, int nret,
@@ -67,13 +67,13 @@ static int of_call_prom_ret(const char *service, int nargs, int nret,
         struct prom_args args;
         va_list list;
 
-        args.service = ADDR(service);
-        args.nargs = nargs;
-        args.nret = nret;
+        args.service = cpu_to_be32(ADDR(service));
+        args.nargs = cpu_to_be32(nargs);
+        args.nret = cpu_to_be32(nret);
 
         va_start(list, rets);
         for (i = 0; i < nargs; i++)
-                args.args[i] = va_arg(list, prom_arg_t);
+                args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
         va_end(list);
 
         for (i = 0; i < nret; i++)
@@ -84,9 +84,9 @@ static int of_call_prom_ret(const char *service, int nargs, int nret,
 
         if (rets != (void *) 0)
                 for (i = 1; i < nret; ++i)
-                        rets[i-1] = args.args[nargs+i];
+                        rets[i-1] = be32_to_cpu(args.args[nargs+i]);
 
-        return (nret > 0)? args.args[nargs]: 0;
+        return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
 }
 
 /* returns true if s2 is a prefix of s1 */