arch/mips/include/asm/mach-ath79/kernel-entry-init.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  Atheros AR71XX/AR724X/AR913X specific kernel entry setup
   4  *
   5  *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
   6  */
   7 #ifndef __ASM_MACH_ATH79_KERNEL_ENTRY_H
   8 #define __ASM_MACH_ATH79_KERNEL_ENTRY_H
   9
  10         /*
  11          * Some bootloaders set the 'Kseg0 coherency algorithm' to
  12          * 'Cacheable, noncoherent, write-through, no write allocate'
  13          * and this cause performance issues. Let's go and change it to
  14          * 'Cacheable, noncoherent, write-back, write allocate'
  15          */
  16         .macro  kernel_entry_setup
  17         mfc0    t0, CP0_CONFIG
  18         li      t1, ~CONF_CM_CMASK
  19         and     t0, t1
  20         ori     t0, CONF_CM_CACHABLE_NONCOHERENT
  21         mtc0    t0, CP0_CONFIG
  22         nop
  23         .endm
  24
  25         .macro  smp_slave_setup
  26         .endm
  27
  28 #endif /* __ASM_MACH_ATH79_KERNEL_ENTRY_H */