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platform_kernel-5.15
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ARM: zynq: Support smp in thumb mode 

Add .arm directive to headsmp.S to ensure that the
CPU starts in 32-bit ARM mode and the correct code
size is copied on smp bring-up.
This is related to the fix applied to SoCFPGA by
commit 5616f36713
("ARM: SoCFPGA: Fix secondary CPU startup in thumb2 kernel")

Additionally, start secondary CPUs on secondary_startup_arm
to automatically switch from ARM to thumb on a thumb kernel

Signed-off-by: Luis Araneda <luaraneda@gmail.com>
Suggested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Luis Araneda 2019-08-08 08:52:42 -04:00 committed by Michal Simek
parent 5f9e832c13
commit 5f595063af
2 changed files with 3 additions and 1 deletions
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2
arch/arm/mach-zynq/headsmp.S
View File

@ -7,6 +7,8 @@
#include <linux/init.h>
#include <asm/assembler.h>
.arm
ENTRY(zynq_secondary_trampoline)
ARM_BE8(setend be) @ ensure we are in BE8 mode
ldr r0, zynq_secondary_trampoline_jump

2
arch/arm/mach-zynq/platsmp.c
View File

@ -81,7 +81,7 @@ EXPORT_SYMBOL(zynq_cpun_start);
static int zynq_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
return zynq_cpun_start(__pa_symbol(secondary_startup), cpu);
return zynq_cpun_start(__pa_symbol(secondary_startup_arm), cpu);
}
/*