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hw: avoid 'cps' instruction in ARM hyp mode

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On some boards or emulators a CPU might be executing in hyp mode
when entering Genode's bootstrap code. In that mode the 'cps' instruction
is not defined. Therefore, we change the way the boot cpu is identified.

Ref #3415
This commit is contained in:
Stefan Kalkowski 2022-01-03 17:09:50 +01:00 committed by Christian Helmuth
parent 6bd7f167a4
commit 426f52068b
1 changed files with 5 additions and 4 deletions
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9
repos/base-hw/src/bootstrap/spec/arm/crt0.s
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@ -51,16 +51,17 @@
*****************************************************/
mov sp, #0 /* for boot cpu use id 0 */
cps #31 /* change to system mode */
bl _start_setup_stack
_boot_cpu_lr:
nop
.global _start_setup_stack /* entrypoint for all cpus */
_start_setup_stack:
mrs r2, cpsr
cmp r2, #31 /* check for system mode */
adr r0, _boot_cpu_lr
cmp r0, lr /* check for boot cpu */
mrcne p15, 0, sp, c0, c0, 5 /* read multiprocessor affinity register */
andne sp, sp, #0xff /* set cpu id for non-boot cpu */
cps #19 /* change to supervisor mode */
adr r0, _start_stack /* load stack address into r0 */
adr r1, _start_stack_size /* load stack size per cpu into r1 */