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mpfs_entrypoints.c: Add simple ACK mechanism for CPU boot #325

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Dec 10, 2024
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mpfs_entrypoints.c: Add simple ACK mechanism for CPU boot #325

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25 changes: 25 additions & 0 deletions arch/risc-v/src/mpfs/mpfs_entrypoints.c
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
#include <stdint.h>
#include <stdbool.h>

#include <nuttx/atomic.h>
#include <nuttx/compiler.h>

#include <sys/types.h>
Expand Down Expand Up @@ -90,6 +91,8 @@ uint8_t g_mpfs_boot_stacks[ENTRY_STACK * ENTRYPT_CNT]
aligned_data(STACK_ALIGNMENT);
#endif

static int g_cpus_booted;

/****************************************************************************
* Public Functions
****************************************************************************/
Expand Down Expand Up @@ -128,6 +131,9 @@ void mpfs_jump_to_app(void)
"la t0, g_app_entrypoints\n" /* Entrypoint table base */
"add t0, t0, t1\n" /* Index in table */
"ld t0, 0(t0)\n" /* Load the address from table */
"li t1, 1\n"
"la t2, g_cpus_booted\n"
"amoadd.w.aqrl zero, t1, 0(t2)\n" /* g_cpus_booted + 1 */
"jr t0\n" /* Jump to entrypoint */
:
#ifdef CONFIG_MPFS_BOARD_PMP
Expand Down Expand Up @@ -246,4 +252,23 @@ bool mpfs_get_use_sbi(uint64_t hartid)
return false;
}

/****************************************************************************
* Name: mpfs_cpus_booted
*
* Description:
* Get amount of CPUs that have completed boot.
*
* Input Parameters:
* None.
*
* Returned value:
* Amount of CPUs that have booted.
*
****************************************************************************/

int mpfs_cpus_booted(void)
{
return atomic_load(&g_cpus_booted);
}

#endif /* CONFIG_MPFS_BOOTLOADER */
16 changes: 16 additions & 0 deletions arch/risc-v/src/mpfs/mpfs_entrypoints.h
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Expand Up @@ -102,6 +102,22 @@ int mpfs_set_use_sbi(uint64_t hartid, bool use_sbi);

bool mpfs_get_use_sbi(uint64_t hartid);

/****************************************************************************
* Name: mpfs_cpus_booted
*
* Description:
* Get amount of CPUs that have completed boot.
*
* Input Parameters:
* None.
*
* Returned value:
* Amount of CPUs that have booted.
*
****************************************************************************/

int mpfs_cpus_booted(void);

#if defined(__cplusplus)
}
#endif
Expand Down
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