target/linux/ar71xx/files-2.6.39/arch/mips/include/asm/mach-ar71xx/kernel-entry-init.h

   1 /*
   2  *  Atheros AR71xx specific kernel entry setup
   3  *
   4  *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  */
  11 #ifndef __ASM_MACH_AR71XX_KERNEL_ENTRY_H
  12 #define __ASM_MACH_AR71XX_KERNEL_ENTRY_H
  13
  14         /*
  15          * Some bootloaders set the 'Kseg0 coherency algorithm' to
  16          * 'Cacheable, noncoherent, write-through, no write allocate'
  17          * and this cause performance issues. Let's go and change it to
  18          * 'Cacheable, noncoherent, write-back, write allocate'
  19          */
  20         .macro  kernel_entry_setup
  21         mfc0    t0, CP0_CONFIG
  22         li      t1, ~CONF_CM_CMASK
  23         and     t0, t1
  24         ori     t0, CONF_CM_CACHABLE_NONCOHERENT
  25         mtc0    t0, CP0_CONFIG
  26         nop
  27         .endm
  28
  29         .macro  smp_slave_setup
  30         .endm
  31
  32 #endif /* __ASM_MACH_AR71XX_KERNEL_ENTRY_H */