From: Nitin Jain <nitin.j...@xilinx.com>
This patch is adding support to switch to EL1 while loading an EL1
application with u-boot running at EL above EL1 in aarch64 mode.
Signed-off-by: Nitin Jain <nit...@xilinx.com>
Signed-off-by: Siva Durga Prasad Paladugu <siva...@xilinx.com>
Signed-off-by: Michal Simek <michal.si...@xilinx.com>
---
board/xilinx/zynqmp/zynqmp.c | 17 +++++++++++++++++
include/command.h | 2 ++
2 files changed, 19 insertions(+)
diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
index ff0b3c75f533..b9825ddaa881 100644
--- a/board/xilinx/zynqmp/zynqmp.c
+++ b/board/xilinx/zynqmp/zynqmp.c
@@ -316,6 +316,23 @@ int zynq_board_read_rom_ethaddr(unsigned char *ethaddr)
return 0;
}
+unsigned long do_go_exec(ulong (*entry)(int, char * const []), int argc,
+ char * const argv[])
+{
+ int ret = 0;
+
+ if (current_el() > 1) {
+ smp_kick_all_cpus();
+ dcache_disable();
+ armv8_switch_to_el1(0x0, 0, 0, 0, (unsigned long)entry,
+ ES_TO_AARCH64);
+ } else {
+ printf("FAIL: current EL is not above EL1\n");
+ ret = EINVAL;
+ }
+ return ret;
+}
+
#if !defined(CONFIG_SYS_SDRAM_BASE) && !defined(CONFIG_SYS_SDRAM_SIZE)
int dram_init_banksize(void)
{
diff --git a/include/command.h b/include/command.h
index 767cabb3df09..56499b8ad5ca 100644
--- a/include/command.h
+++ b/include/command.h
@@ -111,6 +111,8 @@ extern int common_diskboot(cmd_tbl_t *cmdtp, const char
*intf, int argc,
extern int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
extern int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const
argv[]);
+extern unsigned long do_go_exec(ulong (*entry)(int, char * const []), int argc,
+ char * const argv[]);
/*
* Error codes that commands return to cmd_process(). We use the standard 0
* and 1 for success and failure, but add one more case - failure with a
--
1.9.1
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