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vboot: allow for dynamic work buffers 

The vboot library currently relies on link-time known
address and sizes of the work buffer.  Not all platforms
can provide such semantics. Therefore, add an option
to use cbmem for the work buffer. This implies such platforms
can only do verification of the firmware after main memory
has been initialized.

Change-Id: If0b0f6b2a187b5c1fb56af08b6cb384a935be096
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10157
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
This commit is contained in:
Aaron Durbin 2015-05-08 17:14:15 -05:00 committed by Patrick Georgi
parent 1e8be636cc
commit 0e571fd7ac
3 changed files with 24 additions and 2 deletions
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2
src/include/cbmem.h
View File

@ -84,6 +84,7 @@
#define CBMEM_ID_STAGEx_CACHE 0x57a9e100
#define CBMEM_ID_TIMESTAMP 0x54494d45
#define CBMEM_ID_VBOOT_HANDOFF 0x780074f0
#define CBMEM_ID_VBOOT_WORKBUF 0x78007343
#define CBMEM_ID_WIFI_CALIBRATION 0x57494649
#ifndef __ASSEMBLER__
@ -128,6 +129,7 @@
{ CBMEM_ID_SPINTABLE, "SPIN TABLE " }, \
{ CBMEM_ID_TIMESTAMP, "TIME STAMP " }, \
{ CBMEM_ID_VBOOT_HANDOFF, "VBOOT " }, \
{ CBMEM_ID_VBOOT_WORKBUF, "VBOOT WORK " }, \
{ CBMEM_ID_WIFI_CALIBRATION, "WIFI CLBR " },
struct cbmem_entry;

10
src/vendorcode/google/chromeos/vboot2/Kconfig
View File

@ -101,3 +101,13 @@ config VBOOT_BOOT_LOADER_INDEX
help
This is the index of the bootloader component in the verified
firmware block.
config VBOOT_DYNAMIC_WORK_BUFFER
bool "Vboot's work buffer is dynamically allocated."
default n
depends on VBOOT_VERIFY_FIRMWARE
help
This option is used when there isn't enough pre-main memory
ram to allocate the vboot work buffer. That means vboot verification
is after memory init and requires main memory to back the work
buffer.

10
src/vendorcode/google/chromeos/vboot2/common.c
View File

@ -18,6 +18,7 @@
*/
#include <cbfs.h>
#include <cbmem.h>
#include <console/console.h>
#include <reset.h>
#include "../chromeos.h"
@ -25,13 +26,22 @@
#include "../vboot_handoff.h"
#include "misc.h"
static const size_t vb_work_buf_size = 16 * KiB;
struct vb2_working_data * const vboot_get_working_data(void)
{
if (IS_ENABLED(CONFIG_VBOOT_DYNAMIC_WORK_BUFFER))
/* cbmem_add() does a cbmem_find() first. */
return cbmem_add(CBMEM_ID_VBOOT_WORKBUF, vb_work_buf_size);
else
return (struct vb2_working_data *)_vboot2_work;
}
size_t vb2_working_data_size(void)
{
if (IS_ENABLED(CONFIG_VBOOT_DYNAMIC_WORK_BUFFER))
return vb_work_buf_size;
else
return _vboot2_work_size;
}