| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <arch/cpu.h> |
| #include <cbmem.h> |
| #include <console/console.h> |
| #include <cpu/x86/cache.h> |
| #include <program_loading.h> |
| #include <types.h> |
| |
| bool clflush_supported(void) |
| { |
| return (cpuid_edx(1) >> CPUID_FEATURE_CLFLUSH_BIT) & 1; |
| } |
| |
| void clflush_region(const uintptr_t start, const size_t size) |
| { |
| uintptr_t addr; |
| const size_t cl_size = ((cpuid_ebx(1) >> 8) & 0xff) * 8; |
| |
| printk(BIOS_SPEW, "CLFLUSH [0x%lx, 0x%lx]\n", start, start + size); |
| |
| for (addr = ALIGN_DOWN(start, cl_size); addr < start + size; addr += cl_size) |
| clflush((void *)addr); |
| } |
| |
| /* |
| * 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) |
| { |
| /* INVD is only called in postcar stage so we only need |
| to make sure that our code hits dram during romstage. */ |
| if (!ENV_CACHE_AS_RAM) |
| return; |
| if (!ENV_ROMSTAGE) |
| return; |
| if (!CONFIG(POSTCAR_STAGE)) |
| return; |
| if (!CONFIG(X86_CLFLUSH_CAR)) |
| return; |
| if (flags != SEG_FINAL) |
| return; |
| |
| /* |
| * The assumption is made here that DRAM is only ready after cbmem |
| * is initialized, to avoid flushing when loading earlier things (e.g. FSP, ...) |
| */ |
| if (!cbmem_online()) |
| return; |
| |
| if (clflush_supported()) |
| clflush_region(start, size); |
| else |
| printk(BIOS_DEBUG, "Not flushing cache to RAM, CLFLUSH not supported\n"); |
| } |