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[Qemu-devel] [PATCH] target/xtensa: implement RUNSTALL
From: |
Max Filippov |
Subject: |
[Qemu-devel] [PATCH] target/xtensa: implement RUNSTALL |
Date: |
Sun, 15 Jan 2017 13:04:33 -0800 |
RUNSTALL signal stalls core execution while it's applied. It is widely
used in multicore configurations to control activity of additional
cores.
Signed-off-by: Max Filippov <address@hidden>
---
target/xtensa/cpu.c | 3 ++-
target/xtensa/cpu.h | 3 ++-
target/xtensa/helper.c | 13 +++++++++++++
3 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/target/xtensa/cpu.c b/target/xtensa/cpu.c
index 09b53c7..1c18892 100644
--- a/target/xtensa/cpu.c
+++ b/target/xtensa/cpu.c
@@ -47,7 +47,7 @@ static bool xtensa_cpu_has_work(CPUState *cs)
{
XtensaCPU *cpu = XTENSA_CPU(cs);
- return cpu->env.pending_irq_level;
+ return !cpu->env.runstall && cpu->env.pending_irq_level;
}
/* CPUClass::reset() */
@@ -74,6 +74,7 @@ static void xtensa_cpu_reset(CPUState *s)
env->pending_irq_level = 0;
reset_mmu(env);
+ s->halted = env->runstall;
}
static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model)
diff --git a/target/xtensa/cpu.h b/target/xtensa/cpu.h
index 6b044d3..77bd9d2 100644
--- a/target/xtensa/cpu.h
+++ b/target/xtensa/cpu.h
@@ -366,7 +366,7 @@ typedef struct CPUXtensaState {
xtensa_tlb_entry itlb[7][MAX_TLB_WAY_SIZE];
xtensa_tlb_entry dtlb[10][MAX_TLB_WAY_SIZE];
unsigned autorefill_idx;
-
+ bool runstall;
int pending_irq_level; /* level of last raised IRQ */
void **irq_inputs;
QEMUTimer *ccompare_timer;
@@ -469,6 +469,7 @@ static inline void
xtensa_select_static_vectors(CPUXtensaState *env,
assert(n < 2);
env->static_vectors = n;
}
+void xtensa_runstall(CPUXtensaState *env, bool runstall);
#define XTENSA_OPTION_BIT(opt) (((uint64_t)1) << (opt))
#define XTENSA_OPTION_ALL (~(uint64_t)0)
diff --git a/target/xtensa/helper.c b/target/xtensa/helper.c
index 768b32c..c67d715 100644
--- a/target/xtensa/helper.c
+++ b/target/xtensa/helper.c
@@ -728,3 +728,16 @@ void dump_mmu(FILE *f, fprintf_function cpu_fprintf,
CPUXtensaState *env)
cpu_fprintf(f, "No TLB for this CPU core\n");
}
}
+
+void xtensa_runstall(CPUXtensaState *env, bool runstall)
+{
+ CPUState *cpu = CPU(xtensa_env_get_cpu(env));
+
+ env->runstall = runstall;
+ cpu->halted = runstall;
+ if (runstall) {
+ cpu_interrupt(cpu, CPU_INTERRUPT_HALT);
+ } else {
+ cpu_reset_interrupt(cpu, CPU_INTERRUPT_HALT);
+ }
+}
--
2.1.4
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