[U-Boot] [PATCH v3 2/5] ARMv8: Add secure sections for PSCI text and data

[macro.wave.z at gmail.com]

From: Hongbo Zhang <hongbo.zhang at nxp.com>

This patch adds secure_text, secure_data and secure_stack sections for ARMv8 to
hold PSCI text and data, and it is based on the legacy implementation of ARMv7.

Signed-off-by: Hongbo Zhang <hongbo.zhang at nxp.com>
Reviewed-by: Tom Rini <trini at konsulko.com>
---
 arch/arm/config.mk            |  3 ++-
 arch/arm/cpu/armv8/Kconfig    | 31 +++++++++++++++++++++++
 arch/arm/cpu/armv8/u-boot.lds | 57 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 90 insertions(+), 1 deletion(-)

diff --git a/arch/arm/config.mk b/arch/arm/config.mk
index 542b897..112e334 100644
--- a/arch/arm/config.mk
+++ b/arch/arm/config.mk
@@ -118,7 +118,8 @@ endif
 
 # limit ourselves to the sections we want in the .bin.
 ifdef CONFIG_ARM64
-OBJCOPYFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn
+OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .data \
+		-j .u_boot_list -j .rela.dyn
 else
 OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .hash \
 		-j .data -j .got -j .got.plt -j .u_boot_list -j .rel.dyn
diff --git a/arch/arm/cpu/armv8/Kconfig b/arch/arm/cpu/armv8/Kconfig
index cd2d9bb..f2a43b8 100644
--- a/arch/arm/cpu/armv8/Kconfig
+++ b/arch/arm/cpu/armv8/Kconfig
@@ -39,4 +39,35 @@ config PSCI_RESET
 
 	  Select Y here to make use of PSCI calls for system reset
 
+config ARMV8_PSCI
+	bool "Enable PSCI support" if EXPERT
+	default n
+	help
+	  PSCI is Power State Coordination Interface defined by ARM.
+	  The PSCI in U-boot provides a general framework and each platform
+	  can implement their own specific PSCI functions.
+	  Say Y here to enable PSCI support on ARMv8 platform.
+
+config ARMV8_PSCI_NR_CPUS
+	int "Maximum supported CPUs for PSCI"
+	depends on ARMV8_PSCI
+	default 4
+	help
+	  The maximum number of CPUs supported in the PSCI firmware.
+	  It is no problem to set a larger value than the number of CPUs in
+	  the actual hardware implementation.
+
+if SYS_HAS_ARMV8_SECURE_BASE
+
+config ARMV8_SECURE_BASE
+	hex "Secure address for PSCI image"
+	depends on ARMV8_PSCI
+	help
+	  Address for placing the PSCI text, data and stack sections.
+	  If not defined, the PSCI sections are placed together with the u-boot
+	  but platform can choose to place PSCI code image separately in other
+	  places such as some secure RAM built-in SOC etc.
+
+endif
+
 endif
diff --git a/arch/arm/cpu/armv8/u-boot.lds b/arch/arm/cpu/armv8/u-boot.lds
index fd15ad5..22195b8 100644
--- a/arch/arm/cpu/armv8/u-boot.lds
+++ b/arch/arm/cpu/armv8/u-boot.lds
@@ -8,11 +8,17 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
+#include <config.h>
+#include <asm/psci.h>
+
 OUTPUT_FORMAT("elf64-littleaarch64", "elf64-littleaarch64", "elf64-littleaarch64")
 OUTPUT_ARCH(aarch64)
 ENTRY(_start)
 SECTIONS
 {
+#ifdef CONFIG_ARMV8_SECURE_BASE
+	/DISCARD/ : { *(.rela._secure*) }
+#endif
 	. = 0x00000000;
 
 	. = ALIGN(8);
@@ -23,6 +29,57 @@ SECTIONS
 		*(.text*)
 	}
 
+#ifdef CONFIG_ARMV8_PSCI
+	.__secure_start :
+#ifndef CONFIG_ARMV8_SECURE_BASE
+		ALIGN(CONSTANT(COMMONPAGESIZE))
+#endif
+	{
+		KEEP(*(.__secure_start))
+	}
+
+#ifndef CONFIG_ARMV8_SECURE_BASE
+#define CONFIG_ARMV8_SECURE_BASE
+#define __ARMV8_PSCI_STACK_IN_RAM
+#endif
+	.secure_text CONFIG_ARMV8_SECURE_BASE :
+		AT(ADDR(.__secure_start) + SIZEOF(.__secure_start))
+	{
+		*(._secure.text)
+	}
+
+	.secure_data : AT(LOADADDR(.secure_text) + SIZEOF(.secure_text))
+	{
+		*(._secure.data)
+	}
+
+	.secure_stack ALIGN(ADDR(.secure_data) + SIZEOF(.secure_data),
+			    CONSTANT(COMMONPAGESIZE)) (NOLOAD) :
+#ifdef __ARMV8_PSCI_STACK_IN_RAM
+		AT(ADDR(.secure_stack))
+#else
+		AT(LOADADDR(.secure_data) + SIZEOF(.secure_data))
+#endif
+	{
+		KEEP(*(.__secure_stack_start))
+
+		. = . + CONFIG_ARMV8_PSCI_NR_CPUS * ARM_PSCI_STACK_SIZE;
+
+		. = ALIGN(CONSTANT(COMMONPAGESIZE));
+
+		KEEP(*(.__secure_stack_end))
+	}
+
+#ifndef __ARMV8_PSCI_STACK_IN_RAM
+	. = LOADADDR(.secure_stack);
+#endif
+
+	.__secure_end : AT(ADDR(.__secure_end)) {
+		KEEP(*(.__secure_end))
+		LONG(0x1d1071c);	/* Must output something to reset LMA */
+	}
+#endif
+
 	. = ALIGN(8);
 	.rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
-- 
2.1.4