diff options
| -rw-r--r-- | util/cbfstool/cbfstool.c | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/util/cbfstool/cbfstool.c b/util/cbfstool/cbfstool.c index 1d1577f92d..b1b410f084 100644 --- a/util/cbfstool/cbfstool.c +++ b/util/cbfstool/cbfstool.c @@ -106,6 +106,21 @@ static bool region_is_modern_cbfs(const char *region) /* * Converts between offsets from the start of the specified image region and + * "top-aligned" offsets from the top of the entire boot media. See comment + * below for convert_to_from_top_aligned() about forming addresses. + */ +static unsigned convert_to_from_absolute_top_aligned( + const struct buffer *region, unsigned offset) +{ + assert(region); + + size_t image_size = partitioned_file_total_size(param.image_file); + + return image_size - region->offset - offset; +} + +/* + * Converts between offsets from the start of the specified image region and * "top-aligned" offsets from the top of the image region. Works in either * direction: pass in one type of offset and receive the other type. * N.B. A top-aligned offset is always a positive number, and should not be @@ -123,8 +138,7 @@ static unsigned convert_to_from_top_aligned(const struct buffer *region, return region->size - offset; } - size_t image_size = partitioned_file_total_size(param.image_file); - return image_size - region->offset - offset; + return convert_to_from_absolute_top_aligned(region, offset); } static int do_cbfs_locate(int32_t *cbfs_addr, size_t metadata_size) @@ -462,8 +476,8 @@ static int cbfstool_convert_fsp(struct buffer *buffer, /* Ensure the address is a memory mapped one. */ if (!IS_TOP_ALIGNED_ADDRESS(address)) - address = -convert_to_from_top_aligned(param.image_region, - address); + address = -convert_to_from_absolute_top_aligned( + param.image_region, address); /* Create a copy of the buffer to attempt relocation. */ if (buffer_create(&fsp, buffer_size(buffer), "fsp")) @@ -498,9 +512,13 @@ static int cbfstool_convert_mkstage(struct buffer *buffer, uint32_t *offset, return 1; } - /* Pass in a top aligned address. */ - address = -convert_to_from_top_aligned(param.image_region, - address); + /* + * Ensure the address is a memory mapped one. This assumes + * x86 semantics about th boot media being directly mapped + * below 4GiB in the CPU address space. + **/ + address = -convert_to_from_absolute_top_aligned( + param.image_region, address); *offset = address; ret = parse_elf_to_xip_stage(buffer, &output, offset, |