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, 7 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 174e1e96175e..7b90c564e932 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -712,6 +712,13 @@ void __init early_init_devtree(void *params)
         of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
 #endif
 
+        /* Pre-initialize the cmd_line with the content of boot_commmand_line,
+         * which will be empty except when the content of the variable has
+         * been overriden by a bootloading mechanism. This happens typically
+         * with HAL takeover
+         */
+        strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
+
         /* Retrieve various informations from the /chosen node of the
          * device-tree, including the platform type, initrd location and
          * size, TCE reserve, and more ...