| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 */ |