MN10300: And Panasonic AM34 subarch and implement SMP

Implement the Panasonic MN10300 AM34 CPU subarch and implement SMP support for
MN10300.  Also implement support for the MN2WS0060 processor and the ASB2364
evaluation board which are AM34 based.

Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 19 insertions, 1 deletions

diff --git a/arch/mn10300/boot/compressed/head.S b/arch/mn10300/boot/compressed/head.S
index 4ef608a62416..7b50345b9e84 100644
--- a/arch/mn10300/boot/compressed/head.S
+++ b/arch/mn10300/boot/compressed/head.S
@@ -15,10 +15,28 @@
 #include <linux/linkage.h>
 #include <asm/cpu-regs.h>
 #include <asm/cache.h>
+#ifdef CONFIG_SMP
+#include <proc/smp-regs.h>
+#endif
 
         .globl startup_32
 startup_32:
-        # first save off parameters from bootloader
+#ifdef CONFIG_SMP
+        #
+        # Secondary CPUs jump directly to the kernel entry point
+        #
+        # Must save primary CPU's D0-D2 registers as they hold boot parameters
+        #
+        mov     (CPUID), d3
+        and     CPUID_MASK,d3
+        beq     startup_primary
+        mov     CONFIG_KERNEL_TEXT_ADDRESS,a0
+        jmp     (a0)
+
+startup_primary:
+#endif /* CONFIG_SMP */
+
+        # first save parameters from bootloader
         mov     param_save_area,a0
         mov     d0,(a0)
         mov     d1,(4,a0)