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soc/intel/common: Add function to check if xDCI is allowed 

When CONFIG_VBOOT is enabled then the xDCI controller should only be
enabled if the system is in developer mode.  This prevents a system
in normal/verified mode from being used as a USB peripheral device
which could potentially be used to access user data.

This change adds a function to return whether xDCI can be enabled
or not, which will be used by the SOCs.

Change-Id: Ie3ee9dd7077c094a01fd857a2e4033a12ce8979b
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/25347
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Duncan Laurie 2018-03-26 02:17:33 -07:00 committed by Patrick Georgi
parent 969ef10f54
commit 4df7d2c495
2 changed files with 11 additions and 0 deletions
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1
src/soc/intel/common/block/include/intelblocks/xdci.h
View File

@ -17,5 +17,6 @@
#define SOC_INTEL_COMMON_BLOCK_XDCI_H
void soc_xdci_init(struct device *dev);
int xdci_can_enable(void);
#endif /* SOC_INTEL_COMMON_BLOCK_XDCI_H */

10
src/soc/intel/common/block/xdci/xdci.c
View File

@ -19,9 +19,19 @@
#include <device/pci.h>
#include <device/pci_ids.h>
#include <intelblocks/xdci.h>
#include <security/vboot/vboot_common.h>
__attribute__((weak)) void soc_xdci_init(struct device *dev) { /* no-op */ }
/* Only allow xDCI controller in developer mode if VBOOT is enabled */
int xdci_can_enable(void)
{
if (IS_ENABLED(CONFIG_VBOOT))
return vboot_developer_mode_enabled() ? 1 : 0;
else
return 1;
}
static struct device_operations usb_xdci_ops = {
.read_resources = &pci_dev_read_resources,
.set_resources = &pci_dev_set_resources,