| /* |
| * Copyright (c) 2013-2014 Wind River Systems, Inc. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| /** |
| * @file |
| * @brief Cache manipulation |
| * |
| * This module contains functions for manipulating caches. |
| */ |
| |
| #include <arch/x86/asm.h> |
| |
| #ifndef CONFIG_CLFLUSH_INSTRUCTION_SUPPORTED |
| |
| #if defined(CONFIG_CLFLUSH_DETECT) |
| |
| #define CACHE_FLUSH_NAME _cache_flush_wbinvd |
| #define CPUID_CFLSH_BIT (1 << 19) |
| |
| GTEXT(_is_clflush_available) |
| |
| SECTION_FUNC(TEXT, _is_clflush_available) |
| pushl %ebx |
| movl $1, %eax |
| cpuid |
| movl %edx, %eax |
| andl $CPUID_CFLSH_BIT, %eax |
| popl %ebx |
| ret |
| |
| #else |
| #define CACHE_FLUSH_NAME sys_cache_flush |
| #endif |
| |
| /* externs (internal APIs) */ |
| GTEXT(CACHE_FLUSH_NAME) |
| |
| /** |
| * |
| * @brief Flush a page to main memory |
| * |
| * This implementation flushes the whole cache. |
| * |
| * C signature: |
| * |
| * void sys_cache_flush (vaddr_t virt, size_t size) |
| * |
| * Both parameters are ignored in this implementation. |
| * |
| * @return N/A |
| */ |
| |
| SECTION_FUNC(TEXT, CACHE_FLUSH_NAME) |
| wbinvd |
| ret |
| |
| #endif /* !CONFIG_CLFLUSH_INSTRUCTION_SUPPORTED */ |
| |
| #if defined(CONFIG_CACHE_LINE_SIZE_DETECT) |
| |
| #define CPUID_CACHE_LINE_MASK (0xff << 8) |
| |
| GTEXT(_cache_line_size_get) |
| |
| SECTION_FUNC(TEXT, _cache_line_size_get) |
| pushl %ebx |
| movl $1, %eax |
| cpuid |
| movl %ebx, %eax |
| andl $CPUID_CACHE_LINE_MASK, %eax |
| shrl $5,%eax /* shift right 8 to get value, then multiple by 8 |
| * to get cache line size */ |
| popl %ebx |
| ret |
| |
| #endif /* CONFIG_CACHE_LINE_SIZE_DETECT */ |