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risc-v/qemu-rv: Restore FPU context after context switch

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Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
This commit is contained in:
Huang Qi 2022-03-23 15:18:58 +08:00 committed by Xiang Xiao
parent 7b73606300
commit f09ea317c1
1 changed files with 28 additions and 0 deletions
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28
arch/risc-v/src/qemu-rv/qemu_rv_irq_dispatch.c
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@ -117,6 +117,34 @@ void *riscv_dispatch_irq(uintptr_t vector, uintptr_t *regs)
}
#endif
#if defined(CONFIG_ARCH_FPU) || defined(CONFIG_ARCH_ADDRENV)
/* Check for a context switch. If a context switch occurred, then
* CURRENT_REGS will have a different value than it did on entry. If an
* interrupt level context switch has occurred, then restore the floating
* point state and the establish the correct address environment before
* returning from the interrupt.
*/
if (regs != CURRENT_REGS)
{
#ifdef CONFIG_ARCH_FPU
/* Restore floating point registers */
riscv_restorefpu((uintptr_t *)CURRENT_REGS);
#endif
#ifdef CONFIG_ARCH_ADDRENV
/* Make sure that the address environment for the previously
* running task is closed down gracefully (data caches dump,
* MMU flushed) and set up the address environment for the new
* thread at the head of the ready-to-run list.
*/
group_addrenv(NULL);
#endif
}
#endif /* CONFIG_ARCH_FPU || CONFIG_ARCH_ADDRENV */
/* If a context switch occurred while processing the interrupt then
* CURRENT_REGS may have change value. If we return any value different
* from the input regs, then the lower level will know that a context