powerpc/powernv: Get kernel command line accross OPAL takeover

We stash it in boot_command_line which isn't in BSS and so won't
be overwritten. We then use that as a default cmd_line before
we walk the device-tree.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 9369287aa8c2..e3f390427216 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1449,6 +1449,10 @@ static void prom_opal_takeover(void)
                 opal_addr = top_addr;
         args->hal_addr = opal_addr;
 
+        /* Copy the command line to the kernel image */
+        strlcpy(RELOC(boot_command_line), RELOC(prom_cmd_line),
+                COMMAND_LINE_SIZE);
+
         prom_debug("  k_image    = 0x%lx\n", args->k_image);
         prom_debug("  k_size     = 0x%lx\n", args->k_size);
         prom_debug("  k_entry    = 0x%lx\n", args->k_entry);