diff options
Diffstat (limited to 'src/southbridge/intel/lynxpoint')
| -rw-r--r-- | src/southbridge/intel/lynxpoint/Kconfig | 1 | ||||
| -rw-r--r-- | src/southbridge/intel/lynxpoint/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/southbridge/intel/lynxpoint/spi_loading.c | 85 |
3 files changed, 87 insertions, 0 deletions
diff --git a/src/southbridge/intel/lynxpoint/Kconfig b/src/southbridge/intel/lynxpoint/Kconfig index 6f5bfe2313..f79e963206 100644 --- a/src/southbridge/intel/lynxpoint/Kconfig +++ b/src/southbridge/intel/lynxpoint/Kconfig @@ -31,6 +31,7 @@ config SOUTH_BRIDGE_OPTIONS # dummy select PCIEXP_ASPM select PCIEXP_COMMON_CLOCK select SPI_FLASH + select ALT_CBFS_LOAD_PAYLOAD config INTEL_LYNXPOINT_LP bool diff --git a/src/southbridge/intel/lynxpoint/Makefile.inc b/src/southbridge/intel/lynxpoint/Makefile.inc index 6e84ce61a8..51bb42818a 100644 --- a/src/southbridge/intel/lynxpoint/Makefile.inc +++ b/src/southbridge/intel/lynxpoint/Makefile.inc @@ -37,6 +37,7 @@ ramstage-y += me_status.c ramstage-y += reset.c ramstage-y += watchdog.c ramstage-y += acpi.c +ramstage-$(CONFIG_ALT_CBFS_LOAD_PAYLOAD) += spi_loading.c ramstage-$(CONFIG_ELOG) += elog.c ramstage-y += spi.c diff --git a/src/southbridge/intel/lynxpoint/spi_loading.c b/src/southbridge/intel/lynxpoint/spi_loading.c new file mode 100644 index 0000000000..eb3082bb5a --- /dev/null +++ b/src/southbridge/intel/lynxpoint/spi_loading.c @@ -0,0 +1,85 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 ChromeOS Authors + * + * 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 <stdlib.h> +#include <string.h> +#include <arch/byteorder.h> +#include <cbfs.h> +#include <console/console.h> +#include <cpu/x86/smm.h> + +#define CACHELINE_SIZE 64 +#define INTRA_CACHELINE_MASK (CACHELINE_SIZE - 1) +#define CACHELINE_MASK (~INTRA_CACHELINE_MASK) + +/* Mirror the payload file to the default SMM location if it is small enough. + * The default SMM region can be used since no one is using the memory at this + * location at this stage in the boot. */ +static inline void *spi_mirror(void *file_start, int file_len) +{ + int alignment_diff; + char *src; + char *dest = (void *)SMM_DEFAULT_BASE; + + alignment_diff = (INTRA_CACHELINE_MASK & (long)file_start); + + /* Adjust file length so that the start and end points are aligned to a + * cacheline. Coupled with the ROM caching in the CPU the SPI hardware + * will read and cache full length cachelines. It will also prefetch + * data as well. Once things are mirrored in memory all accesses should + * hit the CPUs cache. */ + file_len += alignment_diff; + file_len = ALIGN(file_len, CACHELINE_SIZE); + + printk(BIOS_DEBUG, "Payload aligned size: 0x%x\n", file_len); + + /* Just pass back the pointer to ROM space if the file is larger + * than the RAM mirror region. */ + if (file_len > SMM_DEFAULT_SIZE) + return file_start; + + src = (void *)(CACHELINE_MASK & (long)file_start); + /* 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(dest, src, file_len); + + /* Provide pointer into mirrored space. */ + return &dest[alignment_diff]; +} + +void *cbfs_load_payload(struct cbfs_media *media, const char *name) +{ + int file_len; + void *file_start; + struct cbfs_file *file = cbfs_get_file(media, name); + + if (file == NULL) + return NULL; + + if (ntohl(file->type) != CBFS_TYPE_PAYLOAD) + return NULL; + + file_len = ntohl(file->len); + + file_start = CBFS_SUBHEADER(file); + + return spi_mirror(file_start, file_len); +} |