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bsps/amd64: Add comments to start.s

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This commit is contained in:
Matheus Pecoraro
2024-05-24 15:26:35 -03:00
parent 64844f4468
commit b3a4f539c9
1 changed files with 6 additions and 0 deletions
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6
bsps/x86_64/amd64/start/start.S
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@@ -39,6 +39,12 @@
.type _start, @function
_start:
.cfi_startproc
/*
* _ISR_Stack_area_end is aligned to CPU_INTERRUPT_STACK_ALIGNMENT (64 bits)
* by compiler directive at /cpukit/include/rtems/confdefs/percpu.h
* No reference will occur beyond the stack region since the call
* instruction will decrement the %rsp and then save the value of %rip
*/
movabsq $_ISR_Stack_area_end, %rsp
.cfi_def_cfa_offset 16
xorl %edi, %edi