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target/loongarch:Implement csrrd CSR_MSGIR register

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implement the read-clear feature for CSR_MSGIR register.

Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Message-ID: <20250916122109.749813-11-gaosong@loongson.cn>
This commit is contained in:
Song Gao 2025-09-16 20:21:08 +08:00
parent c2396bfd48
commit ce47eaadbd
4 changed files with 28 additions and 0 deletions
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5
target/loongarch/csr.c
View file

@ -97,6 +97,11 @@ static CSRInfo csr_info[] = {
CSR_OFF(DBG),
CSR_OFF(DERA),
CSR_OFF(DSAVE),
CSR_OFF_ARRAY(MSGIS, 0),
CSR_OFF_ARRAY(MSGIS, 1),
CSR_OFF_ARRAY(MSGIS, 2),
CSR_OFF_ARRAY(MSGIS, 3),
CSR_OFF(MSGIR),
};
CSRInfo *get_csr(unsigned int csr_num)

21
target/loongarch/tcg/csr_helper.c
View file

@ -73,6 +73,27 @@ target_ulong helper_csrrd_tval(CPULoongArchState *env)
return cpu_loongarch_get_constant_timer_ticks(cpu);
}
target_ulong helper_csrrd_msgir(CPULoongArchState *env)
{
int irq, new;
irq = find_first_bit((unsigned long *)env->CSR_MSGIS, 256);
if (irq < 256) {
clear_bit(irq, (unsigned long *)env->CSR_MSGIS);
new = find_first_bit((unsigned long *)env->CSR_MSGIS, 256);
if (new < 256) {
return irq;
}
env->CSR_ESTAT = FIELD_DP64(env->CSR_ESTAT, CSR_ESTAT, MSGINT, 0);
} else {
/* bit 31 set 1 for no invalid irq */
irq = BIT(31);
}
return irq;
}
target_ulong helper_csrwr_estat(CPULoongArchState *env, target_ulong val)
{
int64_t old_v = env->CSR_ESTAT;

1
target/loongarch/tcg/helper.h
View file

@ -100,6 +100,7 @@ DEF_HELPER_1(rdtime_d, i64, env)
DEF_HELPER_1(csrrd_pgd, i64, env)
DEF_HELPER_1(csrrd_cpuid, i64, env)
DEF_HELPER_1(csrrd_tval, i64, env)
DEF_HELPER_1(csrrd_msgir, i64, env)
DEF_HELPER_2(csrwr_stlbps, i64, env, tl)
DEF_HELPER_2(csrwr_estat, i64, env, tl)
DEF_HELPER_2(csrwr_asid, i64, env, tl)

1
target/loongarch/tcg/insn_trans/trans_privileged.c.inc
View file

@ -83,6 +83,7 @@ void loongarch_csr_translate_init(void)
SET_CSR_FUNC(TCFG, NULL, gen_helper_csrwr_tcfg);
SET_CSR_FUNC(TVAL, gen_helper_csrrd_tval, NULL);
SET_CSR_FUNC(TICLR, NULL, gen_helper_csrwr_ticlr);
SET_CSR_FUNC(MSGIR, gen_helper_csrrd_msgir, NULL);
}
#undef SET_CSR_FUNC