diff options
| author | Michael Clark | 2018-04-19 03:19:06 +0200 |
|---|---|---|
| committer | Alistair Francis | 2018-09-04 22:19:37 +0200 |
| commit | efbdbc26a9fc69c222113abd9b80aa38a036fb6b (patch) | |
| tree | 723dfc36aaaface4dc4b704905598088cd82f839 /target/riscv | |
| parent | RISC-V: Use atomic_cmpxchg to update PLIC bitmaps (diff) | |
| download | qemu-efbdbc26a9fc69c222113abd9b80aa38a036fb6b.tar.gz qemu-efbdbc26a9fc69c222113abd9b80aa38a036fb6b.tar.xz qemu-efbdbc26a9fc69c222113abd9b80aa38a036fb6b.zip | |
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>
Diffstat (limited to 'target/riscv')
| -rw-r--r-- | target/riscv/helper.c | 34 |
1 files changed, 12 insertions, 22 deletions
diff --git a/target/riscv/helper.c b/target/riscv/helper.c index 1f0527e07f..63b3386b76 100644 --- a/target/riscv/helper.c +++ b/target/riscv/helper.c @@ -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 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 */ + 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); + + 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); |