114 lines
2.3 KiB
C
114 lines
2.3 KiB
C
/*
|
|
* Copyright (c) 2013-2014 Wind River Systems, Inc.
|
|
* Copyright (c) 2021 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
/**
|
|
* @file
|
|
* @brief Cache manipulation
|
|
*
|
|
* This module contains functions for manipulation caches.
|
|
*/
|
|
|
|
#include <zephyr/kernel.h>
|
|
#include <zephyr/arch/cpu.h>
|
|
#include <zephyr/sys/util.h>
|
|
#include <zephyr/toolchain.h>
|
|
#include <zephyr/cache.h>
|
|
#include <stdbool.h>
|
|
|
|
static inline void z_x86_wbinvd(void)
|
|
{
|
|
__asm__ volatile("wbinvd;\n\t" : : : "memory");
|
|
}
|
|
|
|
void arch_dcache_enable(void)
|
|
{
|
|
uint32_t cr0;
|
|
|
|
/* Enable write-back caching by clearing the NW and CD bits */
|
|
__asm__ volatile("movl %%cr0, %0;\n\t"
|
|
"andl $0x9fffffff, %0;\n\t"
|
|
"movl %0, %%cr0;\n\t"
|
|
: "=r" (cr0));
|
|
}
|
|
|
|
void arch_dcache_disable(void)
|
|
{
|
|
uint32_t cr0;
|
|
|
|
/* Enter the no-fill mode by setting NW=0 and CD=1 */
|
|
__asm__ volatile("movl %%cr0, %0;\n\t"
|
|
"andl $0xdfffffff, %0;\n\t"
|
|
"orl $0x40000000, %0;\n\t"
|
|
"movl %0, %%cr0;\n\t"
|
|
: "=r" (cr0));
|
|
|
|
/* Flush all caches */
|
|
z_x86_wbinvd();
|
|
}
|
|
|
|
int arch_dcache_flush_all(void)
|
|
{
|
|
z_x86_wbinvd();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int arch_dcache_invd_all(void)
|
|
{
|
|
z_x86_wbinvd();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int arch_dcache_flush_and_invd_all(void)
|
|
{
|
|
z_x86_wbinvd();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* No alignment is required for either <virt> or <size>, but since
|
|
* sys_cache_flush() iterates on the cache lines, a cache line alignment for
|
|
* both is optimal.
|
|
*
|
|
* The cache line size is specified via the d-cache-line-size DTS property.
|
|
*/
|
|
int arch_dcache_flush_range(void *start_addr, size_t size)
|
|
{
|
|
size_t line_size = sys_cache_data_line_size_get();
|
|
uintptr_t start = (uintptr_t)start_addr;
|
|
uintptr_t end = start + size;
|
|
|
|
if (line_size == 0U) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
end = ROUND_UP(end, line_size);
|
|
|
|
for (; start < end; start += line_size) {
|
|
__asm__ volatile("clflush %0;\n\t" :
|
|
"+m"(*(volatile char *)start));
|
|
}
|
|
|
|
#if defined(CONFIG_X86_MFENCE_INSTRUCTION_SUPPORTED)
|
|
__asm__ volatile("mfence;\n\t":::"memory");
|
|
#else
|
|
__asm__ volatile("lock; addl $0,-4(%%esp);\n\t":::"memory", "cc");
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int arch_dcache_invd_range(void *start_addr, size_t size)
|
|
{
|
|
return arch_dcache_flush_range(start_addr, size);
|
|
}
|
|
|
|
int arch_dcache_flush_and_invd_range(void *start_addr, size_t size)
|
|
{
|
|
return arch_dcache_flush_range(start_addr, size);
|
|
}
|