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startup: Determine boot CPU by cpu[N].state ADT property

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Signed-off-by: Janne Grunau <j@jannau.net>
This commit is contained in:
Janne Grunau 2024-10-25 17:28:04 +02:00 committed by Hector Martin
parent 4bde778779
commit 293e122845
1 changed files with 22 additions and 6 deletions
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28
src/startup.c
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@ -143,11 +143,7 @@ extern void get_device_info(void);
void _start_c(void *boot_args, void *base)
{
UNUSED(base);
if (in_el2())
msr(TPIDR_EL2, 0);
else
msr(TPIDR_EL1, 0);
u32 cpu_id = 0;
memset64(_bss_start, 0, _bss_end - _bss_start);
boot_args_addr = (u64)boot_args;
@ -156,6 +152,26 @@ void _start_c(void *boot_args, void *base)
adt =
(void *)(((u64)cur_boot_args.devtree) - cur_boot_args.virt_base + cur_boot_args.phys_base);
#ifndef BRINGUP
int node = adt_path_offset(adt, "/cpus");
if (node >= 0) {
ADT_FOREACH_CHILD(adt, node)
{
const char *state = adt_getprop(adt, node, "state", NULL);
if (!state)
continue;
if (strcmp(state, "running") == 0)
if (ADT_GETPROP(adt, node, "cpu-id", &cpu_id) == sizeof(cpu_id))
break;
}
}
#endif
if (in_el2())
msr(TPIDR_EL2, cpu_id);
else
msr(TPIDR_EL1, cpu_id);
int ret = uart_init();
if (ret < 0) {
debug_putc('!');
@ -164,7 +180,7 @@ void _start_c(void *boot_args, void *base)
uart_puts("Initializing");
get_device_info();
printf("CPU init (MIDR: 0x%lx)...\n", mrs(MIDR_EL1));
printf("CPU init (MIDR: 0x%lx smp_id:0x%x)...\n", mrs(MIDR_EL1), smp_id());
const char *type = init_cpu();
printf(" CPU: %s\n\n", type);