87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
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/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_CACHE_H
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#define __ASM_CACHE_H
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#include <asm/cputype.h>
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#define CTR_L1IP_SHIFT 14
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#define CTR_L1IP_MASK 3
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#define CTR_DMINLINE_SHIFT 16
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#define CTR_IMINLINE_SHIFT 0
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#define CTR_CWG_SHIFT 24
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#define CTR_CWG_MASK 15
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#define CTR_CACHE_MINLINE_MASK \
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(0xf << CTR_DMINLINE_SHIFT | 0xf << CTR_IMINLINE_SHIFT)
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#define CTR_L1IP(ctr) (((ctr) >> CTR_L1IP_SHIFT) & CTR_L1IP_MASK)
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#define ICACHE_POLICY_VPIPT 0
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#define ICACHE_POLICY_VIPT 2
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#define ICACHE_POLICY_PIPT 3
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#define L1_CACHE_SHIFT 7
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#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
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/*
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* Memory returned by kmalloc() may be used for DMA, so we must make
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* sure that all such allocations are cache aligned. Otherwise,
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* unrelated code may cause parts of the buffer to be read into the
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* cache before the transfer is done, causing old data to be seen by
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* the CPU.
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*/
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#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
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#ifndef __ASSEMBLY__
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#include <linux/bitops.h>
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#define ICACHEF_ALIASING 0
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#define ICACHEF_VPIPT 1
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extern unsigned long __icache_flags;
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/*
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* Whilst the D-side always behaves as PIPT on AArch64, aliasing is
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* permitted in the I-cache.
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*/
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static inline int icache_is_aliasing(void)
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{
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return test_bit(ICACHEF_ALIASING, &__icache_flags);
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}
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static inline int icache_is_vpipt(void)
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{
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return test_bit(ICACHEF_VPIPT, &__icache_flags);
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}
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static inline u32 cache_type_cwg(void)
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{
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return (read_cpuid_cachetype() >> CTR_CWG_SHIFT) & CTR_CWG_MASK;
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}
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#define __read_mostly __attribute__((__section__(".data..read_mostly")))
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static inline int cache_line_size(void)
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{
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u32 cwg = cache_type_cwg();
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return cwg ? 4 << cwg : L1_CACHE_BYTES;
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}
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#endif /* __ASSEMBLY__ */
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#endif
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