stm32mp1: use last page of SYSRAM as SCMI shared memory
SCMI shared memory is used to exchange message payloads between
secure SCMI services and non-secure SCMI agents. It is mapped
uncached (device) mainly to conform to existing support in
the Linux kernel. Note that executive messages are mostly short
(few 32bit words) hence not using cache will not penalize much
performances.
Platform stm32mp1 shall configure ETZPC to harden properly the
secure and non-secure areas of the SYSRAM address space, that before
CPU accesses the shared memory when mapped non-secure.
This change defines STM32MP_SEC_SYSRAM_BASE/STM32MP_SEC_SYSRAM_SIZE and
STM32MP_NS_SYSRAM_BASE/STM32MP_NS_SYSRAM_SIZE.
Change-Id: I71ff02a359b9668ae1c5a71b5f102cf3d310f289
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
diff --git a/plat/st/stm32mp1/stm32mp1_private.c b/plat/st/stm32mp1/stm32mp1_private.c
index 779228d..fd60db2 100644
--- a/plat/st/stm32mp1/stm32mp1_private.c
+++ b/plat/st/stm32mp1/stm32mp1_private.c
@@ -30,12 +30,29 @@
BOARD_ID_REVISION_SHIFT)
#define BOARD_ID2BOM(_id) ((_id) & BOARD_ID_BOM_MASK)
-#define MAP_SRAM MAP_REGION_FLAT(STM32MP_SYSRAM_BASE, \
+#if defined(IMAGE_BL2)
+#define MAP_SEC_SYSRAM MAP_REGION_FLAT(STM32MP_SYSRAM_BASE, \
STM32MP_SYSRAM_SIZE, \
MT_MEMORY | \
MT_RW | \
MT_SECURE | \
MT_EXECUTE_NEVER)
+#elif defined(IMAGE_BL32)
+#define MAP_SEC_SYSRAM MAP_REGION_FLAT(STM32MP_SEC_SYSRAM_BASE, \
+ STM32MP_SEC_SYSRAM_SIZE, \
+ MT_MEMORY | \
+ MT_RW | \
+ MT_SECURE | \
+ MT_EXECUTE_NEVER)
+
+/* Non-secure SYSRAM is used a uncached memory for SCMI message transfer */
+#define MAP_NS_SYSRAM MAP_REGION_FLAT(STM32MP_NS_SYSRAM_BASE, \
+ STM32MP_NS_SYSRAM_SIZE, \
+ MT_DEVICE | \
+ MT_RW | \
+ MT_NS | \
+ MT_EXECUTE_NEVER)
+#endif
#define MAP_DEVICE1 MAP_REGION_FLAT(STM32MP1_DEVICE1_BASE, \
STM32MP1_DEVICE1_SIZE, \
@@ -53,7 +70,7 @@
#if defined(IMAGE_BL2)
static const mmap_region_t stm32mp1_mmap[] = {
- MAP_SRAM,
+ MAP_SEC_SYSRAM,
MAP_DEVICE1,
MAP_DEVICE2,
{0}
@@ -61,7 +78,8 @@
#endif
#if defined(IMAGE_BL32)
static const mmap_region_t stm32mp1_mmap[] = {
- MAP_SRAM,
+ MAP_SEC_SYSRAM,
+ MAP_NS_SYSRAM,
MAP_DEVICE1,
MAP_DEVICE2,
{0}