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

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Add support to switch to EL1 and load an EL1 app from U-Boot which is
executing at EL2 or EL3 in aarch64 mode.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Link: https://lore.kernel.org/r/20220506055345.1921-1-ashok.reddy.soma@xilinx.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
Ashok Reddy Soma 2022-05-05 23:53:45 -06:00 committed by Michal Simek
parent a110caa206
commit 2eeceb4842
1 changed files with 17 additions and 0 deletions
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17
board/xilinx/versal/board.c
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@ -91,6 +91,23 @@ int board_early_init_r(void)
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;
}
static u8 versal_get_bootmode(void)
{
u8 bootmode;