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 */

 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 */