[MIPS] Qemu: Accept kernel command line passed by the Emulator.

    
From Daniel Jacobowitz <dan@debian.org>.
    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 12 insertions, 1 deletions

diff --git a/arch/mips/qemu/q-firmware.c b/arch/mips/qemu/q-firmware.c
index 5980f02b2df9..fb2a8673a6bf 100644
--- a/arch/mips/qemu/q-firmware.c
+++ b/arch/mips/qemu/q-firmware.c
@@ -1,7 +1,18 @@
 #include <linux/init.h>
+#include <linux/string.h>
+#include <asm/addrspace.h>
 #include <asm/bootinfo.h>
 
 void __init prom_init(void)
 {
-        add_memory_region(0x0<<20, 0x10<<20, BOOT_MEM_RAM);
+        int *cmdline;
+
+        cmdline = (int *) (CKSEG0 + (0x10 << 20) - 260);
+        if (*cmdline == 0x12345678) {
+                if (*(char *)(cmdline + 1))
+                        strcpy (arcs_cmdline, (char *)(cmdline + 1));
+                add_memory_region(0x0<<20, cmdline[-1], BOOT_MEM_RAM);
+        } else {
+                add_memory_region(0x0<<20, 0x10<<20, BOOT_MEM_RAM);
+        }
 }