cbfs: new API and better program loading

A new CBFS API is introduced to allow making CBFS access
easier for providing multiple CBFS sources. That is achieved
by decoupling the cbfs source from a CBFS file. A CBFS
source is described by a descriptor. It contains the necessary
properties for walking a CBFS to locate a file. The CBFS
file is then decoupled from the CBFS descriptor in that it's
no longer needed to access the contents of the file.

All of this is accomplished using the regions infrastructure
by repsenting CBFS sources and files as region_devices. Because
region_devices can be chained together forming subregions this
allows one to decouple a CBFS source from a file. This also allows
one to provide CBFS files that came from other sources for
payload and/or stage loading.

The program loading takes advantage of those very properties
by allowing multiple sources for locating a program. Because of
this we can reduce the overhead of loading programs because
it's all done in the common code paths. Only locating the
program is per source.

Change-Id: I339b84fce95f03d1dbb63a0f54a26be5eb07f7c8
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9134
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

2 files changed, 3 insertions, 76 deletions

diff --git a/src/cpu/ti/am335x/bootblock_media.c b/src/cpu/ti/am335x/bootblock_media.c
index 79724eea5d..0a8ccb696c 100644
--- a/src/cpu/ti/am335x/bootblock_media.c
+++ b/src/cpu/ti/am335x/bootblock_media.c
@@ -18,80 +18,13 @@
  */
 
 #include <boot_device.h>
-#include <cbfs.h>
-#include <console/console.h>
-#include <string.h>
 #include <symbols.h>
 
 /* FIXME: No idea how big the internal SRAM actually is. */
-static const struct mem_region_device gboot_dev =
+static const struct mem_region_device boot_dev =
 	MEM_REGION_DEV_INIT(_dram, CONFIG_ROM_SIZE);
 
 const struct region_device *boot_device_ro(void)
 {
-	return &gboot_dev.rdev;
-}
-
-static int dummy_open(struct cbfs_media *media)
-{
-	return 0;
-}
-
-static int dummy_close(struct cbfs_media *media)
-{
-	return 0;
-}
-
-static void * on_chip_memory_map(struct cbfs_media *media, size_t offset,
-				 size_t count)
-{
-	const struct region_device *boot_dev;
-	void *ptr;
-
-	boot_dev = media->context;
-
-	ptr = rdev_mmap(boot_dev, offset, count);
-
-	if (ptr == NULL)
-		return (void *)-1;
-
-	return ptr;
-}
-
-static void * dummy_unmap(struct cbfs_media *media, const void *address)
-{
-	const struct region_device *boot_dev;
-
-	boot_dev = media->context;
-
-	rdev_munmap(boot_dev, (void *)address);
-
-	return NULL;
-}
-
-static size_t on_chip_memory_read(struct cbfs_media *media, void *dest,
-				  size_t offset, size_t count)
-{
-	const struct region_device *boot_dev;
-
-	boot_dev = media->context;
-
-	if (rdev_readat(boot_dev, dest, offset, count) < 0)
-		return 0;
-
-	return count;
-}
-
-int init_default_cbfs_media(struct cbfs_media *media)
-{
-	boot_device_init();
-
-	media->context = (void *)boot_device_ro();
-	media->open = dummy_open;
-	media->close = dummy_close;
-	media->map = on_chip_memory_map;
-	media->unmap = dummy_unmap;
-	media->read = on_chip_memory_read;
-
-	return 0;
+	return &boot_dev.rdev;
 }
diff --git a/src/cpu/ti/am335x/nand.c b/src/cpu/ti/am335x/nand.c
index dd05fb6dee..4ac359da59 100644
--- a/src/cpu/ti/am335x/nand.c
+++ b/src/cpu/ti/am335x/nand.c
@@ -18,15 +18,9 @@
  */
 
 #include <boot_device.h>
-#include <cbfs.h>
 
 const struct region_device *boot_device_ro(void)
 {
-	return NULL;
-}
-
-int init_default_cbfs_media(struct cbfs_media *media)
-{
 	/* FIXME: add support for reading coreboot from NAND */
-	return -1;
+	return NULL;
 }