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target/xtensa: implement RUNSTALL 

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 <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2016-12-13 18:52:08 -08:00
parent 17ab14acd4
commit bd527a8323
3 changed files with 17 additions and 2 deletions
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3
target/xtensa/cpu.c
View File

@ -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)

3
target/xtensa/cpu.h
View File

@ -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)

13
target/xtensa/helper.c
View File

@ -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);
}
}