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arm64: zynqmp: Add support to load an app at EL1

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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 <nitinj@xilinx.com>
Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Nitin Jain 2018-02-16 12:56:17 +05:30 committed by Michal Simek
parent 429f0b9e14
commit 51916864b3
2 changed files with 19 additions and 0 deletions
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17
board/xilinx/zynqmp/zynqmp.c
View file

@ -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)
{

2
include/command.h
View file

@ -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