SPM: Split S-EL1 shim from S-EL0 application
The shim prepares the S-EL1/0 environment (stack, VBAR, MMU, I-cache,
BSS clear, PIE fixup) for usage by the S-EL0 application. Split ivy
and shim parition code into separate folders.
Signed-off-by: Ruari Phipps <ruari.phipps@arm.com>
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: I203bbc0d379b12bd5cf1991b95e4f3a7d78d63d4
diff --git a/spm/ivy/shim/shim_main.c b/spm/ivy/shim/shim_main.c
new file mode 100644
index 0000000..97df1cc
--- /dev/null
+++ b/spm/ivy/shim/shim_main.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <debug.h>
+#include <drivers/arm/pl011.h>
+#include <drivers/console.h>
+#include <errno.h>
+#include <ffa_helpers.h>
+#include <lib/aarch64/arch_helpers.h>
+#include <lib/xlat_tables/xlat_mmu_helpers.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <plat_arm.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+#include <sp_debug.h>
+#include <sp_helpers.h>
+#include <std_svc.h>
+
+#include "ivy.h"
+#include "ivy_def.h"
+
+static void shim_print_memory_layout(void)
+{
+ NOTICE("Secure Partition memory layout:\n");
+
+ NOTICE(" Image regions\n");
+ NOTICE(" Text region : %p - %p\n",
+ (void *)IVY_TEXT_START, (void *)IVY_TEXT_END);
+ NOTICE(" Read-only data region : %p - %p\n",
+ (void *)IVY_RODATA_START, (void *)IVY_RODATA_END);
+ NOTICE(" Data region : %p - %p\n",
+ (void *)IVY_DATA_START, (void *)IVY_DATA_END);
+ NOTICE(" BSS region : %p - %p\n",
+ (void *)IVY_BSS_START, (void *)IVY_BSS_END);
+ NOTICE(" Total image memory : %p - %p\n",
+ (void *)IVY_IMAGE_BASE,
+ (void *)(IVY_IMAGE_BASE + IVY_IMAGE_SIZE));
+ NOTICE(" SPM regions\n");
+ NOTICE(" SPM <-> SP buffer : %p - %p\n",
+ (void *)IVY_SPM_BUF_BASE,
+ (void *)(IVY_SPM_BUF_BASE + IVY_SPM_BUF_SIZE));
+ NOTICE(" NS <-> SP buffer : %p - %p\n",
+ (void *)IVY_NS_BUF_BASE,
+ (void *)(IVY_NS_BUF_BASE + IVY_NS_BUF_SIZE));
+}
+
+static void shim_plat_configure_mmu(void)
+{
+ mmap_add_region(SHIM_TEXT_START,
+ SHIM_TEXT_START,
+ SHIM_TEXT_END - SHIM_TEXT_START,
+ MT_CODE | MT_PRIVILEGED);
+ mmap_add_region(SHIM_RODATA_START,
+ SHIM_RODATA_START,
+ SHIM_RODATA_END - SHIM_RODATA_START,
+ MT_RO_DATA | MT_PRIVILEGED);
+ mmap_add_region(SHIM_DATA_START,
+ SHIM_DATA_START,
+ SHIM_DATA_END - SHIM_DATA_START,
+ MT_RW_DATA | MT_PRIVILEGED);
+ mmap_add_region(SHIM_BSS_START,
+ SHIM_BSS_START,
+ SHIM_BSS_END - SHIM_BSS_START,
+ MT_RW_DATA | MT_PRIVILEGED);
+ mmap_add_region(IVY_TEXT_START,
+ IVY_TEXT_START,
+ IVY_TEXT_END - IVY_TEXT_START,
+ MT_CODE | MT_USER);
+ mmap_add_region(IVY_RODATA_START,
+ IVY_RODATA_START,
+ IVY_RODATA_END - IVY_RODATA_START,
+ MT_RO_DATA | MT_USER);
+ mmap_add_region(IVY_DATA_START,
+ IVY_DATA_START,
+ IVY_DATA_END - IVY_DATA_START,
+ MT_RW_DATA | MT_USER);
+ mmap_add_region(IVY_BSS_START,
+ IVY_BSS_START,
+ IVY_BSS_END - IVY_BSS_START,
+ MT_RW_DATA | MT_USER);
+
+ init_xlat_tables();
+}
+
+int shim_main(void)
+{
+ assert(IS_IN_EL1() != 0);
+
+ /* Initialise console */
+ set_putc_impl(HVC_CALL_AS_STDOUT);
+
+ NOTICE("Booting S-EL1 Shim\n");
+
+ /* Configure and enable Stage-1 MMU, enable D-Cache */
+ shim_plat_configure_mmu();
+ enable_mmu_el1(0);
+
+ shim_print_memory_layout();
+
+ return 0;
+}