/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright ( C ) 2012 ARM Ltd .
*/
#ifndef __ASM_CACHE_H
#define __ASM_CACHE_H
#define L1_CACHE_SHIFT (6 )
#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
#define CLIDR_LOUU_SHIFT 27
#define CLIDR_LOC_SHIFT 24
#define CLIDR_LOUIS_SHIFT 21
#define CLIDR_LOUU(clidr) (((clidr) >> CLIDR_LOUU_SHIFT) & 0 x7)
#define CLIDR_LOC(clidr) (((clidr) >> CLIDR_LOC_SHIFT) & 0 x7)
#define CLIDR_LOUIS(clidr) (((clidr) >> CLIDR_LOUIS_SHIFT) & 0 x7)
/* Ctypen, bits[3(n - 1) + 2 : 3(n - 1)], for n = 1 to 7 */
#define CLIDR_CTYPE_SHIFT(level) (3 * (level - 1 ))
#define CLIDR_CTYPE_MASK(level) (7 << CLIDR_CTYPE_SHIFT(level))
#define CLIDR_CTYPE(clidr, level) \
(((clidr) & CLIDR_CTYPE_MASK(level)) >> CLIDR_CTYPE_SHIFT(level))
/* Ttypen, bits [2(n - 1) + 34 : 2(n - 1) + 33], for n = 1 to 7 */
#define CLIDR_TTYPE_SHIFT(level) (2 * ((level) - 1 ) + CLIDR_EL1_Ttypen_SHIFT)
/*
* Memory returned by kmalloc ( ) may be used for DMA , so we must make
* sure that all such allocations are cache aligned . Otherwise ,
* unrelated code may cause parts of the buffer to be read into the
* cache before the transfer is done , causing old data to be seen by
* the CPU .
*/
#define ARCH_DMA_MINALIGN (128 )
#define ARCH_KMALLOC_MINALIGN (8 )
#if !defined (__ASSEMBLY__) && !defined (BUILD_VDSO)
#include <linux/bitops.h>
#include <linux/kasan-enabled.h>
#include <asm /cputype.h>
#include <asm /mte-def.h>
#include <asm /sysreg.h>
#ifdef CONFIG_KASAN_SW_TAGS
#define ARCH_SLAB_MINALIGN (1 ULL << KASAN_SHADOW_SCALE_SHIFT)
#elif defined (CONFIG_KASAN_HW_TAGS)
static inline unsigned int arch_slab_minalign(void )
{
return kasan_hw_tags_enabled() ? MTE_GRANULE_SIZE :
__alignof__(unsigned long long );
}
#define arch_slab_minalign() arch_slab_minalign()
#endif
#define CTR_L1IP(ctr) SYS_FIELD_GET(CTR_EL0, L1Ip, ctr)
#define ICACHEF_ALIASING 0
extern unsigned long __icache_flags;
/*
* Whilst the D - side always behaves as PIPT on AArch64 , aliasing is
* permitted in the I - cache .
*/
static inline int icache_is_aliasing(void )
{
return test_bit(ICACHEF_ALIASING, &__icache_flags);
}
static inline u32 cache_type_cwg(void )
{
return SYS_FIELD_GET(CTR_EL0, CWG, read_cpuid_cachetype());
}
#define __read_mostly __section(".data..read_mostly" )
static inline int cache_line_size_of_cpu(void )
{
u32 cwg = cache_type_cwg();
return cwg ? 4 << cwg : ARCH_DMA_MINALIGN;
}
int cache_line_size(void );
#define dma_get_cache_alignment cache_line_size
/* Compress a u64 MPIDR value into 32 bits. */
static inline u64 arch_compact_of_hwid(u64 id)
{
u64 aff3 = MPIDR_AFFINITY_LEVEL(id, 3 );
/*
* These bits are expected to be RES0 . If not , return a value with
* the upper 32 bits set to force the caller to give up on 32 bit
* cache ids .
*/
if (FIELD_GET(GENMASK_ULL(63 , 40 ), id))
return id;
return (aff3 << 24 ) | FIELD_GET(GENMASK_ULL(23 , 0 ), id);
}
#define arch_compact_of_hwid arch_compact_of_hwid
/*
* Read the effective value of CTR_EL0 .
*
* According to ARM ARM for ARMv8 - A ( ARM DDI 0487 C . a ) ,
* section D10 . 2 . 33 " CTR_EL0 , Cache Type Register " :
*
* CTR_EL0 . IDC reports the data cache clean requirements for
* instruction to data coherence .
*
* 0 - dcache clean to PoU is required unless :
* ( CLIDR_EL1 . LoC = = 0 ) | | ( CLIDR_EL1 . LoUIS = = 0 & & CLIDR_EL1 . LoUU = = 0 )
* 1 - dcache clean to PoU is not required for i - to - d coherence .
*
* This routine provides the CTR_EL0 with the IDC field updated to the
* effective state .
*/
static inline u32 __attribute_const__ read_cpuid_effective_cachetype(void )
{
u32 ctr = read_cpuid_cachetype();
if (!(ctr & BIT(CTR_EL0_IDC_SHIFT))) {
u64 clidr = read_sysreg(clidr_el1);
if (CLIDR_LOC(clidr) == 0 ||
(CLIDR_LOUIS(clidr) == 0 && CLIDR_LOUU(clidr) == 0 ))
ctr |= BIT(CTR_EL0_IDC_SHIFT);
}
return ctr;
}
#endif /* !defined(__ASSEMBLY__) && !defined(BUILD_VDSO) */
#endif
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(vorverarbeitet am 2026-09-28)
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