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bl1_fwu_image_copy() refactoring

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This patch refactors the code of the function handling a FWU_AUTH_COPY
SMC in BL1. All input validation has been moved upfront so it is now
shared between the RESET and COPYING states.

Change-Id: I6a86576b9ce3243c401c2474fe06f06687a70e2f
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Signed-off-by: Dan Handley <dan.handley@arm.com>
This commit is contained in:
Sandrine Bailleux 2016-11-14 14:56:51 +00:00 • committed by Dan Handley
parent 9f1489e445
commit b38a9e5cd7
1 changed files with 33 additions and 58 deletions
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91
bl1/bl1_fwu.c
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@ -121,6 +121,7 @@ static int bl1_fwu_image_copy(unsigned int image_id,
unsigned int flags)
{
uintptr_t dest_addr;
unsigned int remaining;
/* Get the image descriptor. */
image_desc_t *image_desc = bl1_plat_get_image_desc(image_id);
@ -156,39 +157,9 @@ static int bl1_fwu_image_copy(unsigned int image_id,
return -ENOMEM;
}
/* Get the image base address. */
dest_addr = image_desc->image_info.image_base;
if (image_desc->state == IMAGE_STATE_COPYING) {
image_size = image_desc->image_info.image_size;
/*
* If the given block size is more than the total image size
* then clip the former to the latter.
*/
if (image_desc->copied_size + block_size > image_size) {
WARN("BL1-FWU: Block size is too big, clipping it.\n");
block_size = image_size - image_desc->copied_size;
}
/* Make sure the source image is mapped in memory. */
if (bl1_plat_mem_check(image_src, block_size, flags)) {
WARN("BL1-FWU: Source image to copy is not mapped.\n");
return -ENOMEM;
}
INFO("BL1-FWU: Continuing image copy in blocks\n");
/* Copy image for given block size. */
dest_addr += image_desc->copied_size;
image_desc->copied_size += block_size;
memcpy((void *)dest_addr, (const void *)image_src, block_size);
flush_dcache_range(dest_addr, block_size);
/* Update the state if last block. */
if (image_desc->copied_size == image_size) {
image_desc->state = IMAGE_STATE_COPIED;
INFO("BL1-FWU: Image copy in blocks completed\n");
}
} else { /* image_desc->state == IMAGE_STATE_RESET */
INFO("BL1-FWU: Initial call to copy an image\n");
@ -202,20 +173,6 @@ static int bl1_fwu_image_copy(unsigned int image_id,
return -ENOMEM;
}
/*
* If the given block size is more than the total image size
* then clip the former to the latter.
*/
if (block_size > image_size) {
WARN("BL1-FWU: Block size is too big, clipping it.\n");
block_size = image_size;
}
/* Make sure the source image is mapped in memory. */
if (bl1_plat_mem_check(image_src, block_size, flags)) {
WARN("BL1-FWU: Copy arguments source/size not mapped\n");
return -ENOMEM;
}
#if LOAD_IMAGE_V2
/* Check that the image size to load is within limit */
if (image_size > image_desc->image_info.image_max_size) {
@ -237,22 +194,40 @@ static int bl1_fwu_image_copy(unsigned int image_id,
/* Save the given image size. */
image_desc->image_info.image_size = image_size;
/* Copy the block of data. */
memcpy((void *)dest_addr, (const void *)image_src, block_size);
flush_dcache_range(dest_addr, block_size);
/* Update the state of the FWU state machine. */
if (block_size == image_size) {
image_desc->state = IMAGE_STATE_COPIED;
INFO("BL1-FWU: Image is copied successfully\n");
} else {
image_desc->state = IMAGE_STATE_COPYING;
INFO("BL1-FWU: Started image copy in blocks\n");
}
image_desc->copied_size = block_size;
/*
* copied_size must be explicitly initialized here because the
* FWU code doesn't necessarily do it when it resets the state
* machine.
*/
image_desc->copied_size = 0;
}
/*
* If the given block size is more than the total image size
* then clip the former to the latter.
*/
remaining = image_size - image_desc->copied_size;
if (block_size > remaining) {
WARN("BL1-FWU: Block size is too big, clipping it.\n");
block_size = remaining;
}
/* Make sure the source image is mapped in memory. */
if (bl1_plat_mem_check(image_src, block_size, flags)) {
WARN("BL1-FWU: Source image is not mapped.\n");
return -ENOMEM;
}
/* Everything looks sane. Go ahead and copy the block of data. */
dest_addr = image_desc->image_info.image_base + image_desc->copied_size;
memcpy((void *) dest_addr, (const void *) image_src, block_size);
flush_dcache_range(dest_addr, block_size);
image_desc->copied_size += block_size;
image_desc->state = (block_size == remaining) ?
IMAGE_STATE_COPIED : IMAGE_STATE_COPYING;
INFO("BL1-FWU: Copy operation successful.\n");
return 0;
}