SPM: Move shim layer to TTBR1_EL1
This gives each Secure Partition complete freedom on its address space.
Previously, the memory used by the exception vectors was reserved and
couldn't be used. Also, it always had to be mapped, forcing SPM to
generate translation tables that included the exception vectors as well
as the Partition memory regions. With this change, partitions can reduce
their address space size easily.
Change-Id: I67fb5e9bdf2870b73347f23bff702fab0a8f8711
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/services/std_svc/spm/spm_xlat.c b/services/std_svc/spm/spm_xlat.c
index 5f83096..58d61fc 100644
--- a/services/std_svc/spm/spm_xlat.c
+++ b/services/std_svc/spm/spm_xlat.c
@@ -95,6 +95,34 @@
};
/*******************************************************************************
+ * Translation table context used for S-EL1 exception vectors
+ ******************************************************************************/
+
+REGISTER_XLAT_CONTEXT2(spm_sel1, SPM_SHIM_MMAP_REGIONS, SPM_SHIM_XLAT_TABLES,
+ SPM_SHIM_XLAT_VIRT_ADDR_SPACE_SIZE, PLAT_PHY_ADDR_SPACE_SIZE,
+ EL1_EL0_REGIME, PLAT_SP_IMAGE_XLAT_SECTION_NAME);
+
+void spm_exceptions_xlat_init_context(void)
+{
+ /* This region contains the exception vectors used at S-EL1. */
+ mmap_region_t sel1_exception_vectors =
+ MAP_REGION(SPM_SHIM_EXCEPTIONS_PTR,
+ 0x0UL,
+ SPM_SHIM_EXCEPTIONS_SIZE,
+ MT_CODE | MT_SECURE | MT_PRIVILEGED);
+
+ mmap_add_region_ctx(&spm_sel1_xlat_ctx,
+ &sel1_exception_vectors);
+
+ init_xlat_tables_ctx(&spm_sel1_xlat_ctx);
+}
+
+uint64_t *spm_exceptions_xlat_get_base_table(void)
+{
+ return spm_sel1_xlat_ctx.base_table;
+}
+
+/*******************************************************************************
* Functions to allocate memory for regions.
******************************************************************************/
@@ -300,15 +328,6 @@
void sp_map_memory_regions(sp_context_t *sp_ctx)
{
- /* This region contains the exception vectors used at S-EL1. */
- const mmap_region_t sel1_exception_vectors =
- MAP_REGION_FLAT(SPM_SHIM_EXCEPTIONS_START,
- SPM_SHIM_EXCEPTIONS_SIZE,
- MT_CODE | MT_SECURE | MT_PRIVILEGED);
-
- mmap_add_region_ctx(sp_ctx->xlat_ctx_handle,
- &sel1_exception_vectors);
-
struct sp_rd_sect_mem_region *rdmem;
for (rdmem = sp_ctx->rd.mem_region; rdmem != NULL; rdmem = rdmem->next) {