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target/riscv: Allow setting mstatus virtulisation bits

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Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Revieweb-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Alistair Francis 2019-04-20 02:27:18 +00:00 committed by Palmer Dabbelt
parent 49aaa3e534
commit 1f0419cb04
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GPG Key ID: EF4CA1502CCBAB41
1 changed files with 8 additions and 9 deletions
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17
target/riscv/csr.c
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@ -290,7 +290,6 @@ static int write_mstatus(CPURISCVState *env, int csrno, target_ulong val)
{
target_ulong mstatus = env->mstatus;
target_ulong mask = 0;
target_ulong mpp = get_field(val, MSTATUS_MPP);
/* flush tlb on mstatus fields that affect VM */
if (env->priv_ver <= PRIV_VERSION_1_09_1) {
@ -305,7 +304,7 @@ static int write_mstatus(CPURISCVState *env, int csrno, target_ulong val)
MSTATUS_VM : 0);
}
if (env->priv_ver >= PRIV_VERSION_1_10_0) {
if ((val ^ mstatus) & (MSTATUS_MXR | MSTATUS_MPP |
if ((val ^ mstatus) & (MSTATUS_MXR | MSTATUS_MPP | MSTATUS_MPV |
MSTATUS_MPRV | MSTATUS_SUM)) {
tlb_flush(CPU(riscv_env_get_cpu(env)));
}
@ -313,13 +312,13 @@ static int write_mstatus(CPURISCVState *env, int csrno, target_ulong val)
MSTATUS_SPP | MSTATUS_FS | MSTATUS_MPRV | MSTATUS_SUM |
MSTATUS_MPP | MSTATUS_MXR | MSTATUS_TVM | MSTATUS_TSR |
MSTATUS_TW;
}
/* silenty discard mstatus.mpp writes for unsupported modes */
if (mpp == PRV_H ||
(!riscv_has_ext(env, RVS) && mpp == PRV_S) ||
(!riscv_has_ext(env, RVU) && mpp == PRV_U)) {
mask &= ~MSTATUS_MPP;
#if defined(TARGET_RISCV64)
/*
* RV32: MPV and MTL are not in mstatus. The current plan is to
* add them to mstatush. For now, we just don't support it.
*/
mask |= MSTATUS_MPP | MSTATUS_MPV;
#endif
}
mstatus = (mstatus & ~mask) | (val & mask);