lmb: riscv: 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.

Reviewed-by: Rick Chen <[email protected]>
Signed-off-by: Marek Vasut <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Leo <[email protected]>
Cc: Rick Chen <[email protected]>
Cc: Simon Goldschmidt <[email protected]>
Cc: Tom Rini <[email protected]>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c
index 8dd18205403..ff1bdf71318 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);
+}