cpu/x86/mp_init.c: Make it work for !CONFIG_SMP
With very little changes this code can be used to initialize systems
without SMP. The linker will remove most of the code.
Change-Id: Ia0e8fdf8ed7bc2e0e4ff01be8d3e3c3cb837e6c7
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59692
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index 693b802..13ff65d 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -1,12 +1,13 @@
config PARALLEL_MP
def_bool y
depends on !LEGACY_SMP_INIT
- depends on SMP
select CPU_INFO_V2
help
This option uses common MP infrastructure for bringing up APs
in parallel. It additionally provides a more flexible mechanism
for sequencing the steps of bringing up the APs.
+ The code also works for just initialising the BSP in case there
+ are no APs.
config PARALLEL_MP_AP_WORK
def_bool n
diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c
index 507b5fe..acbe579 100644
--- a/src/cpu/x86/mp_init.c
+++ b/src/cpu/x86/mp_init.c
@@ -593,6 +593,10 @@
return CB_ERR;
}
+ /* We just need to run things on the BSP */
+ if (!CONFIG(SMP))
+ return bsp_do_flight_plan(p);
+
/* Default to currently running CPU. */
num_cpus = allocate_cpu_devices(cpu_bus, p);