diff options
author | Richard Henderson <richard.henderson@linaro.org> | 2022-02-26 01:56:15 -1000 |
---|---|---|
committer | Richard Henderson <richard.henderson@linaro.org> | 2022-03-03 09:51:59 -1000 |
commit | b72c9d5951f1dfa047f545408dd9e35597e6b9d3 (patch) | |
tree | 9e3e33056b2417870a4e8aef8a84c54c7c3613ab /target/nios2 | |
parent | 8d8d73b55144e0d8d3c15a83a8fd8f3de78c460d (diff) |
target/nios2: Rewrite interrupt handling
Previously, we would avoid setting CPU_INTERRUPT_HARD when interrupts
are disabled at a particular point in time, instead queuing the value
into cpu->irq_pending. This is more complicated than required.
Instead, set CPU_INTERRUPT_HARD any time there is a pending interrupt,
and exclusively check for interrupts disabled in nios2_cpu_exec_interrupt.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'target/nios2')
-rw-r--r-- | target/nios2/cpu.c | 10 | ||||
-rw-r--r-- | target/nios2/cpu.h | 1 | ||||
-rw-r--r-- | target/nios2/helper.h | 1 | ||||
-rw-r--r-- | target/nios2/op_helper.c | 19 | ||||
-rw-r--r-- | target/nios2/translate.c | 14 |
5 files changed, 9 insertions, 36 deletions
diff --git a/target/nios2/cpu.c b/target/nios2/cpu.c index 4cade61e93..6975ae4bdb 100644 --- a/target/nios2/cpu.c +++ b/target/nios2/cpu.c @@ -73,12 +73,9 @@ static void nios2_cpu_set_irq(void *opaque, int irq, int level) env->regs[CR_IPENDING] = deposit32(env->regs[CR_IPENDING], irq, 1, !!level); - env->irq_pending = env->regs[CR_IPENDING] & env->regs[CR_IENABLE]; - - if (env->irq_pending && (env->regs[CR_STATUS] & CR_STATUS_PIE)) { - env->irq_pending = 0; + if (env->regs[CR_IPENDING]) { cpu_interrupt(cs, CPU_INTERRUPT_HARD); - } else if (!env->irq_pending) { + } else { cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); } } @@ -134,7 +131,8 @@ static bool nios2_cpu_exec_interrupt(CPUState *cs, int interrupt_request) CPUNios2State *env = &cpu->env; if ((interrupt_request & CPU_INTERRUPT_HARD) && - (env->regs[CR_STATUS] & CR_STATUS_PIE)) { + (env->regs[CR_STATUS] & CR_STATUS_PIE) && + (env->regs[CR_IPENDING] & env->regs[CR_IENABLE])) { cs->exception_index = EXCP_IRQ; nios2_cpu_do_interrupt(cs); return true; diff --git a/target/nios2/cpu.h b/target/nios2/cpu.h index d2ba0c5bbd..a00e4229ce 100644 --- a/target/nios2/cpu.h +++ b/target/nios2/cpu.h @@ -160,7 +160,6 @@ struct CPUNios2State { #if !defined(CONFIG_USER_ONLY) Nios2MMU mmu; - uint32_t irq_pending; #endif int error_code; }; diff --git a/target/nios2/helper.h b/target/nios2/helper.h index 21ef7f0791..a44ecfdf7a 100644 --- a/target/nios2/helper.h +++ b/target/nios2/helper.h @@ -24,5 +24,4 @@ DEF_HELPER_FLAGS_2(raise_exception, TCG_CALL_NO_WG, noreturn, env, i32) DEF_HELPER_2(mmu_write_tlbacc, void, env, i32) DEF_HELPER_2(mmu_write_tlbmisc, void, env, i32) DEF_HELPER_2(mmu_write_pteaddr, void, env, i32) -DEF_HELPER_1(check_interrupts, void, env) #endif diff --git a/target/nios2/op_helper.c b/target/nios2/op_helper.c index d729379e4d..caa885f7b4 100644 --- a/target/nios2/op_helper.c +++ b/target/nios2/op_helper.c @@ -21,28 +21,9 @@ #include "qemu/osdep.h" #include "cpu.h" #include "exec/helper-proto.h" -#include "exec/cpu_ldst.h" #include "exec/exec-all.h" #include "qemu/main-loop.h" -#if !defined(CONFIG_USER_ONLY) -static void nios2_check_interrupts(CPUNios2State *env) -{ - if (env->irq_pending && - (env->regs[CR_STATUS] & CR_STATUS_PIE)) { - env->irq_pending = 0; - cpu_interrupt(env_cpu(env), CPU_INTERRUPT_HARD); - } -} - -void helper_check_interrupts(CPUNios2State *env) -{ - qemu_mutex_lock_iothread(); - nios2_check_interrupts(env); - qemu_mutex_unlock_iothread(); -} -#endif /* !CONFIG_USER_ONLY */ - void helper_raise_exception(CPUNios2State *env, uint32_t index) { CPUState *cs = env_cpu(env); diff --git a/target/nios2/translate.c b/target/nios2/translate.c index a5f8d20729..f89271dbed 100644 --- a/target/nios2/translate.c +++ b/target/nios2/translate.c @@ -491,19 +491,15 @@ static void wrctl(DisasContext *dc, uint32_t code, uint32_t flags) case CR_IPENDING: /* ipending is read only, writes ignored. */ break; + case CR_STATUS: + case CR_IENABLE: + /* If interrupts were enabled using WRCTL, trigger them. */ + dc->base.is_jmp = DISAS_UPDATE; + /* fall through */ default: tcg_gen_mov_tl(cpu_R[instr.imm5 + CR_BASE], v); break; } - - /* If interrupts were enabled using WRCTL, trigger them. */ - if ((instr.imm5 + CR_BASE) == CR_STATUS) { - if (tb_cflags(dc->base.tb) & CF_USE_ICOUNT) { - gen_io_start(); - } - gen_helper_check_interrupts(cpu_env); - dc->base.is_jmp = DISAS_UPDATE; - } #endif } |