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kernel: init: allow custom switch to main for no-multithreading case

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Certain architectures, such as ARM Cortex-M require a custom
switch to main(), in case the case we build Zephyr without
support for multithreading (CONFIG_MULTITHREADING=n). So as
to keep the change to kernel/init.c as unintrusive as
possible, we install an ARCH-specific hook in z_cstart(),
which gets called for architectures that require this
customized switch to main() function.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2020-08-03 11:11:19 +02:00 • committed by Carles Cufí
commit 60bd51aa37
1 changed files with 8 additions and 0 deletions
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8
kernel/init.c
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@ -477,6 +477,13 @@ FUNC_NORETURN void z_cstart(void)
#ifdef CONFIG_MULTITHREADING
switch_to_main_thread(prepare_multithreading());
#else
#ifdef ARCH_SWITCH_TO_MAIN_NO_MULTITHREADING
/* Custom ARCH-specific routine to switch to main()
* in the case of no multi-threading.
*/
ARCH_SWITCH_TO_MAIN_NO_MULTITHREADING(bg_thread_main,
NULL, NULL, NULL);
#else
bg_thread_main(NULL, NULL, NULL);
@ -488,6 +495,7 @@ FUNC_NORETURN void z_cstart(void)
}
/* LCOV_EXCL_STOP */
#endif
#endif /* CONFIG_MULTITHREADING */
/*
* Compiler can't tell that the above routines won't return and issues