diff options
Diffstat (limited to 'src/soc/intel/braswell/spi_loading.c')
| -rw-r--r-- | src/soc/intel/braswell/spi_loading.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/soc/intel/braswell/spi_loading.c b/src/soc/intel/braswell/spi_loading.c new file mode 100644 index 0000000000..4130045e5f --- /dev/null +++ b/src/soc/intel/braswell/spi_loading.c @@ -0,0 +1,154 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * Copyright (C) 2015 Intel Corp. + * + * 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. + */ + + +#include <arch/byteorder.h> +#include <boot/coreboot_tables.h> +#include <cbmem.h> +#include <cbfs.h> +#include <console/console.h> +#include <stdlib.h> +#include <string.h> +#include <vendorcode/google/chromeos/chromeos.h> + +#define CACHELINE_SIZE 64 +#define INTRA_CACHELINE_MASK (CACHELINE_SIZE - 1) +#define CACHELINE_MASK (~INTRA_CACHELINE_MASK) + +static void *find_mirror_buffer(int len) +{ + int nentries; + int i; + struct lb_memory *mem; + void *buffer; + + len = ALIGN(len, 4096); + + mem = get_lb_mem(); + nentries = (mem->size - sizeof(*mem)) / sizeof(mem->map[0]); + + /* + * Find the highest RAM entry that accommodates the lenth provide + * while falling below 4GiB. + */ + buffer = NULL; + for (i = 0; i < nentries; i++) { + const uint64_t max_addr = 1ULL << 32; + uint64_t start; + uint64_t size; + struct lb_memory_range *r; + + r = &mem->map[i]; + + if (r->type != LB_MEM_RAM) + continue; + + start = unpack_lb64(r->start); + if (start >= max_addr) + continue; + + size = unpack_lb64(r->size); + if (size < len) + continue; + + /* Adjust size of buffer if range exceeds max address. */ + if (start + size > max_addr) + size = max_addr - start; + + if (size < len) + continue; + + buffer = (void *)(uintptr_t)(start + size - len); + } + + return buffer; +} + +/* + * 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 void *spi_mirror(void *file_start, int file_len) +{ + int alignment_diff; + char *src; + char *dest; + + 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); + + dest = find_mirror_buffer(file_len); + + /* + * Just pass back the pointer to ROM space if a buffer could not + * be found to mirror into. + */ + if (dest == NULL) + 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; + + file_start = vboot_get_payload(&file_len); + + if (file_start != NULL) + return spi_mirror(file_start, file_len); + + 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); +} |