lmb: xtensa: 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: Chris Zankel <chris@zankel.net>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tom Rini <trini@konsulko.com>

diff --git a/arch/xtensa/lib/bootm.c b/arch/xtensa/lib/bootm.c
index bb1e2886abc785d54d23389f3ddc1b38b8c74938..277af1816833750320f999c30409fd5bafd7c8a7 100644 (file)
--- a/arch/xtensa/lib/bootm.c
+++ b/arch/xtensa/lib/bootm.c
@@ -197,3 +197,15 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
        return 1;
 }
 
+static ulong get_sp(void)
+{
+       ulong ret;
+
+       asm("mov %0, a1" : "=r"(ret) : );
+       return ret;
+}
+
+void arch_lmb_reserve(struct lmb *lmb)
+{
+       arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 4096);
+}