diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/x86/Kconfig | 9 | ||||
| -rw-r--r-- | src/cpu/x86/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/cpu/x86/mirror_payload.c | 71 |
3 files changed, 81 insertions, 0 deletions
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig index 19fa246fe2..b5bb7e62c2 100644 --- a/src/cpu/x86/Kconfig +++ b/src/cpu/x86/Kconfig @@ -121,3 +121,12 @@ config BACKUP_DEFAULT_SMM_REGION help The cpu support will select this option if the default SMM region needs to be backed up for suspend/resume purposes. + +config MIRROR_PAYLOAD_TO_RAM_BEFORE_LOADING + def_bool n + help + On certain platforms a boot speed gain can be realized if mirroring + the payload data stored in non-volatile storage. On x86 systems the + payload would typically live in a memory-mapped SPI part. Copying + the SPI contents to ram before performing the load can speed up + the boot process. diff --git a/src/cpu/x86/Makefile.inc b/src/cpu/x86/Makefile.inc index d5bc2fd219..277ba484a6 100644 --- a/src/cpu/x86/Makefile.inc +++ b/src/cpu/x86/Makefile.inc @@ -3,6 +3,7 @@ romstage-$(CONFIG_HAVE_ACPI_RESUME) += car.c subdirs-$(CONFIG_PARALLEL_MP) += name ramstage-$(CONFIG_PARALLEL_MP) += mp_init.c +ramstage-$(CONFIG_MIRROR_PAYLOAD_TO_RAM_BEFORE_LOADING) += mirror_payload.c SIPI_ELF=$(obj)/cpu/x86/sipi_vector.elf SIPI_BIN=$(SIPI_ELF:.elf=) diff --git a/src/cpu/x86/mirror_payload.c b/src/cpu/x86/mirror_payload.c new file mode 100644 index 0000000000..edd26416f2 --- /dev/null +++ b/src/cpu/x86/mirror_payload.c @@ -0,0 +1,71 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2014 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#include <console/console.h> +#include <bootmem.h> +#include <payload_loader.h> + +void mirror_payload(struct payload *payload) +{ + char *buffer; + size_t size; + char *src; + uintptr_t alignment_diff; + const unsigned long cacheline_size = 64; + const uintptr_t intra_cacheline_mask = cacheline_size - 1; + const uintptr_t cacheline_mask = ~intra_cacheline_mask; + + src = payload->backing_store.data; + size = payload->backing_store.size; + + /* + * Adjust size so that the start and end points are aligned to a + * cacheline. The SPI hardware controllers on Intel machines should + * cache full length cachelines as well as prefetch data. Once the + * data is mirrored in memory all accesses should hit the CPU's cache. + */ + alignment_diff = (intra_cacheline_mask & (uintptr_t)src); + size += alignment_diff; + + size = ALIGN(size, cacheline_size); + + printk(BIOS_DEBUG, "Payload aligned size: 0x%zx\n", size); + + buffer = bootmem_allocate_buffer(size); + + if (buffer == NULL) { + printk(BIOS_DEBUG, "No buffer for mirroring payload.\n"); + return; + } + + src = (void *)(cacheline_mask & (uintptr_t)src); + + /* + * Note that if mempcy is not using 32-bit moves the performance will + * degrade because the SPI hardware prefetchers look for + * cacheline-aligned 32-bit accesses to kick in. + */ + memcpy(buffer, src, size); + + /* Update the payload's backing store. */ + payload->backing_store.data = &buffer[alignment_diff]; +} |