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/* SPDX-License-Identifier: BSD-3-Clause */
/* This file is part of the coreboot project. */
/*
* cache.c: Cache maintenance routines for ARMv8 (aarch64)
*
* Reference: ARM Architecture Reference Manual, ARMv8-A edition
*/
#include <stdint.h>
#include <arch/cache.h>
#include <arch/lib_helpers.h>
#include <program_loading.h>
unsigned int dcache_line_bytes(void)
{
uint32_t ctr_el0;
static unsigned int line_bytes = 0;
if (line_bytes)
return line_bytes;
ctr_el0 = raw_read_ctr_el0();
/* [19:16] - Indicates (Log2(number of words in cache line) */
line_bytes = 1 << ((ctr_el0 >> 16) & 0xf);
/* Bytes in a word (32-bit) */
line_bytes *= sizeof(uint32_t);
return line_bytes;
}
enum dcache_op {
OP_DCCSW,
OP_DCCISW,
OP_DCISW,
OP_DCCIVAC,
OP_DCCVAC,
OP_DCIVAC,
};
/*
* Do a dcache operation by virtual address. This is useful for maintaining
* coherency in drivers which do DMA transfers and only need to perform
* cache maintenance on a particular memory range rather than the entire cache.
*/
static void dcache_op_va(void const *addr, size_t len, enum dcache_op op)
{
uint64_t line, linesize;
linesize = dcache_line_bytes();
line = (uint64_t)addr & ~(linesize - 1);
dsb();
while ((void *)line < addr + len) {
switch (op) {
case OP_DCCIVAC:
dccivac(line);
break;
case OP_DCCVAC:
dccvac(line);
break;
case OP_DCIVAC:
dcivac(line);
break;
default:
break;
}
line += linesize;
}
isb();
}
void dcache_clean_by_mva(void const *addr, size_t len)
{
dcache_op_va(addr, len, OP_DCCVAC);
}
void dcache_clean_invalidate_by_mva(void const *addr, size_t len)
{
dcache_op_va(addr, len, OP_DCCIVAC);
}
void dcache_invalidate_by_mva(void const *addr, size_t len)
{
dcache_op_va(addr, len, OP_DCIVAC);
}
/*
* For each segment of a program loaded this function is called
* to invalidate caches for the addresses of the loaded segment
*/
void arch_segment_loaded(uintptr_t start, size_t size, int flags)
{
uint32_t sctlr = raw_read_sctlr_el3();
if (sctlr & SCTLR_C)
dcache_clean_by_mva((void *)start, size);
else if (sctlr & SCTLR_I)
dcache_clean_invalidate_by_mva((void *)start, size);
icache_invalidate_all();
}
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