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Feature/boot output #281

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Feature/boot output #281

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9bcc355
fix: hartid 0 was not shown in the Boot prompt
echtwerner Oct 7, 2024
15df1df
feature: Add waitcylcle output
echtwerner Oct 7, 2024
a9d9f86
style: Bootoutput
echtwerner Oct 7, 2024
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17 changes: 11 additions & 6 deletions kernel/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,12 +10,13 @@ volatile static int started = 0;
void
main()
{
// Initialize an array to hold a waitcycle count per cpu.
uint waitcycle[NCPU];

if(cpuid() == 0){
consoleinit();
printfinit();
printf("\n");
printf("xv6 kernel is booting\n");
printf("\n");
printf("\nxv6 kernel is booting\n\n");
kinit(); // physical page allocator
kvminit(); // create kernel page table
kvminithart(); // turn on paging
Expand All @@ -29,13 +30,17 @@ main()
fileinit(); // file table
virtio_disk_init(); // emulated hard disk
userinit(); // first user process
printf("\n");
printf("hart %d started\n", cpuid());
__sync_synchronize();
started = 1;
} else {
while(started == 0)
;
waitcycle[cpuid()]=0;
while(started == 0){
waitcycle[cpuid()]= waitcycle[cpuid()] + 1; //count the waitcylce per hart
}
__sync_synchronize();
printf("hart %d starting\n", cpuid());
printf("hart %d starting: wait cycle %d\n", cpuid(), waitcycle[cpuid()] );
kvminithart(); // turn on paging
trapinithart(); // install kernel trap vector
plicinithart(); // ask PLIC for device interrupts
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