Commit bd527a83 authored by Max Filippov's avatar Max Filippov
Browse files

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: default avatarMax Filippov <jcmvbkbc@gmail.com>
parent 17ab14ac

target/xtensa/cpu.c

+2 −1
Original line number Diff line number Diff line
@@ -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)

target/xtensa/cpu.h

+2 −1
Original line number Diff line number Diff line
@@ -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)

target/xtensa/helper.c

+13 −0
Original line number Diff line number Diff line
@@ -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);

    }

}