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esp32_cpustart.c: Improve comments around the usage of the inter-cpu

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startup handshake.

Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>
This commit is contained in:
Abdelatif Guettouche 2021-12-02 16:34:56 +01:00 committed by Xiang Xiao
parent b34951e3a0
commit 50d217a9e8
1 changed files with 7 additions and 4 deletions
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11
arch/xtensa/src/esp32/esp32_cpustart.c
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@ -164,7 +164,9 @@ void xtensa_appcpu_start(void)
sched_note_cpu_started(tcb);
#endif
/* Handle interlock */
/* Release the spinlock to signal to the PRO CPU that the APP CPU has
* started.
*/
g_appcpu_started = true;
spin_unlock(&g_appcpu_interlock);
@ -268,8 +270,9 @@ int up_cpu_start(int cpu)
sched_note_cpu_start(this_task(), cpu);
#endif
/* The waitsem semaphore is used for signaling and, hence, should not
* have priority inheritance enabled.
/* This spinlock will be used as a handshake between the two CPUs.
* It's first initialized to its locked state, later the PRO CPU will
* try to lock it but spins until the APP CPU starts and unlocks it.
*/
spin_initialize(&g_appcpu_interlock, SP_LOCKED);
@ -313,7 +316,7 @@ int up_cpu_start(int cpu)
ets_set_appcpu_boot_addr((uint32_t)xtensa_appcpu_start);
/* And wait for the initial task to run on CPU1 */
/* And wait until the APP CPU starts and releases the spinlock. */
spin_lock(&g_appcpu_interlock);
DEBUGASSERT(g_appcpu_started);