lmb: nios2: Add arch_lmb_reserve()

Add arch_lmb_reserve() implemented using arch_lmb_reserve_generic().
It is rather likely this architecture also needs to cover U-Boot with
LMB before booting Linux.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Thomas Chou <thomas@wytron.com.tw>
Cc: Tom Rini <trini@konsulko.com>

diff --git a/arch/nios2/lib/bootm.c b/arch/nios2/lib/bootm.c
index 503746715155ed1aa868d57a67c3fadc43a594f7..3cb59bd977731c25bd86661a7738581260a7769c 100644 (file)
--- a/arch/nios2/lib/bootm.c
+++ b/arch/nios2/lib/bootm.c
@@ -10,6 +10,9 @@
 #include <image.h>
 #include <irq_func.h>
 #include <log.h>
+#include <asm/global_data.h>
+
+DECLARE_GLOBAL_DATA_PTR;
 
 #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
 
@@ -60,3 +63,16 @@ int do_bootm_linux(int flag, int argc, char *const argv[],
 
        return 1;
 }
+
+static ulong get_sp(void)
+{
+       ulong ret;
+
+       asm("mov %0, sp" : "=r"(ret) : );
+       return ret;
+}
+
+void arch_lmb_reserve(struct lmb *lmb)
+{
+       arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 4096);
+}