[PATCH 09/14] lmb: riscv: Add arch_lmb_reserve()

[Marek Vasut]

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+rene...@gmail.com>
Cc: Atish Patra <atish.pa...@wdc.com>
Cc: Leo <ycli...@andestech.com>
Cc: Rick Chen <r...@andestech.com>
Cc: Simon Goldschmidt <simon.k.r.goldschm...@gmail.com>
Cc: Tom Rini <tr...@konsulko.com>
---
 arch/riscv/lib/bootm.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c
index 8dd1820540..ff1bdf7131 100644
--- a/arch/riscv/lib/bootm.c
+++ b/arch/riscv/lib/bootm.c
@@ -135,3 +135,16 @@ int do_bootm_vxworks(int flag, int argc, char *const 
argv[],
 {
        return do_bootm_linux(flag, argc, argv, images);
 }
+
+static ulong get_sp(void)
+{
+       ulong ret;
+
+       asm("mv %0, sp" : "=r"(ret) : );
+       return ret;
+}
+
+void arch_lmb_reserve(struct lmb *lmb)
+{
+       arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 4096);
+}
-- 
2.30.2