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RISC-V: Simplify riscv_cpu_local_irqs_pending 

This commit is intended to improve readability.
There is no change to the logic.

Cc: Sagar Karandikar <sagark@eecs.berkeley.edu>
Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Alistair Francis <Alistair.Francis@wdc.com>
Signed-off-by: Michael Clark <mjc@sifive.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Michael Clark 2018-04-19 13:19:06 +12:00 committed by Alistair Francis
parent d78940ec5d
commit efbdbc26a9
1 changed files with 11 additions and 21 deletions
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32
target/riscv/helper.c
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@ -35,28 +35,18 @@ int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
}
#ifndef CONFIG_USER_ONLY
/*
* Return RISC-V IRQ number if an interrupt should be taken, else -1.
* Used in cpu-exec.c
*
* Adapted from Spike's processor_t::take_interrupt()
*/
static int riscv_cpu_hw_interrupts_pending(CPURISCVState *env)
static int riscv_cpu_local_irq_pending(CPURISCVState *env)
{
target_ulong pending_interrupts = atomic_read(&env->mip) & env->mie;
target_ulong mstatus_mie = get_field(env->mstatus, MSTATUS_MIE);
target_ulong mstatus_sie = get_field(env->mstatus, MSTATUS_SIE);
target_ulong pending = atomic_read(&env->mip) & env->mie;
target_ulong mie = env->priv < PRV_M || (env->priv == PRV_M && mstatus_mie);
target_ulong sie = env->priv < PRV_S || (env->priv == PRV_S && mstatus_sie);
target_ulong irqs = (pending & ~env->mideleg & -mie) |
(pending & env->mideleg & -sie);
target_ulong mie = get_field(env->mstatus, MSTATUS_MIE);
target_ulong m_enabled = env->priv < PRV_M || (env->priv == PRV_M && mie);
target_ulong enabled_interrupts = pending_interrupts &
~env->mideleg & -m_enabled;
target_ulong sie = get_field(env->mstatus, MSTATUS_SIE);
target_ulong s_enabled = env->priv < PRV_S || (env->priv == PRV_S && sie);
enabled_interrupts |= pending_interrupts & env->mideleg &
-s_enabled;
if (enabled_interrupts) {
return ctz64(enabled_interrupts); /* since non-zero */
if (irqs) {
return ctz64(irqs); /* since non-zero */
} else {
return EXCP_NONE; /* indicates no pending interrupt */
}
@ -69,7 +59,7 @@ bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
if (interrupt_request & CPU_INTERRUPT_HARD) {
RISCVCPU *cpu = RISCV_CPU(cs);
CPURISCVState *env = &cpu->env;
int interruptno = riscv_cpu_hw_interrupts_pending(env);
int interruptno = riscv_cpu_local_irq_pending(env);
if (interruptno >= 0) {
cs->exception_index = RISCV_EXCP_INT_FLAG | interruptno;
riscv_cpu_do_interrupt(cs);