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lib: Check MSIP bit after returning from WFI
As per the RISC-V privilege specification, WFI can be implemented as a NOP. Software should ensure that relevant interrupt pending bits are set. Otherwise, loop back to WFI. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
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1 changed files with 5 additions and 2 deletions
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@ -385,7 +385,7 @@ static unsigned long coldboot_wait_bitmap = 0;
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void sbi_hart_wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
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{
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unsigned long saved_mie;
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unsigned long saved_mie, cmip;
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const struct sbi_platform *plat = sbi_platform_ptr(scratch);
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if ((sbi_platform_hart_count(plat) <= hartid) ||
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@ -407,7 +407,10 @@ void sbi_hart_wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
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/* Wait for coldboot to finish using WFI */
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while (!coldboot_done) {
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spin_unlock(&coldboot_lock);
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wfi();
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do {
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wfi();
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cmip = csr_read(CSR_MIP);
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} while (!(cmip & MIP_MSIP));
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spin_lock(&coldboot_lock);
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};
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