MIPS: TXx9: Add prom_getenv

Add prom_getenv() which can be used for YAMON.  This assumes other
firmware should pass NULL for fw_arg2.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c
index 33d8c9e3223d..005179c2af21 100644
--- a/arch/mips/txx9/generic/setup.c
+++ b/arch/mips/txx9/generic/setup.c
@@ -212,6 +212,21 @@ char * __init prom_getcmdline(void)
 	return &(arcs_cmdline[0]);
 }
 
+const char *__init prom_getenv(const char *name)
+{
+	const s32 *str = (const s32 *)fw_arg2;
+
+	if (!str)
+		return NULL;
+	/* YAMON style ("name", "value" pairs) */
+	while (str[0] && str[1]) {
+		if (!strcmp((const char *)(unsigned long)str[0], name))
+			return (const char *)(unsigned long)str[1];
+		str += 2;
+	}
+	return NULL;
+}
+
 static void __noreturn txx9_machine_halt(void)
 {
 	local_irq_disable();