[ar71xx] add a workaround for fixing the bad performance of the Ubiquiti RouterStatio...

SVN-Revision: 14556

diff --git a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/kernel-entry-init.h b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/kernel-entry-init.h
new file mode 100644 (file)
index 0000000..948d280
--- /dev/null
+++ b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/kernel-entry-init.h
@@ -0,0 +1,32 @@
+/*
+ *  Atheros AR71xx specific kernel entry setup
+ *
+ *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ */
+#ifndef __ASM_MACH_AR71XX_KERNEL_ENTRY_H
+#define __ASM_MACH_AR71XX_KERNEL_ENTRY_H
+
+       /*
+        * Some bootloaders set the 'Kseg0 coherency algorithm' to
+        * 'Cacheable, noncoherent, write-through, no write allocate'
+        * and this cause performance issues. Let's go and change it to
+        * 'Cacheable, noncoherent, write-back, write allocate'
+        */
+       .macro  kernel_entry_setup
+       mfc0    t0, CP0_CONFIG
+       li      t1, ~CONF_CM_CMASK
+       and     t0, t1
+       ori     t0, CONF_CM_CACHABLE_NONCOHERENT
+       mtc0    t0, CP0_CONFIG
+       nop
+       .endm
+
+       .macro  smp_slave_setup
+       .endm
+
+#endif /* __ASM_MACH_AR71XX_KERNEL_ENTRY_H */