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target/riscv: Add support for the 32-bit MSTATUSH CSR

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Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Alistair Francis 2020-01-31 17:03:05 -08:00 committed by Palmer Dabbelt
parent 3067553993
commit 551fa7e8a6
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GPG Key ID: 2E1319F35FBB1889
6 changed files with 62 additions and 0 deletions
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3
target/riscv/cpu.c
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@ -237,6 +237,9 @@ static void riscv_cpu_dump_state(CPUState *cs, FILE *f, int flags)
#ifndef CONFIG_USER_ONLY
qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "mhartid ", env->mhartid);
qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "mstatus ", env->mstatus);
#ifdef TARGET_RISCV32
qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "mstatush ", env->mstatush);
#endif
if (riscv_has_ext(env, RVH)) {
qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "hstatus ", env->hstatus);
qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "vsstatus ", env->vsstatus);

10
target/riscv/cpu.h
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@ -127,6 +127,10 @@ struct CPURISCVState {
target_ulong mip;
#ifdef TARGET_RISCV32
target_ulong mstatush;
#endif
uint32_t miclaim;
target_ulong mie;
@ -164,6 +168,9 @@ struct CPURISCVState {
target_ulong vscause;
target_ulong vstval;
target_ulong vsatp;
#ifdef TARGET_RISCV32
target_ulong vsstatush;
#endif
target_ulong mtval2;
target_ulong mtinst;
@ -176,6 +183,9 @@ struct CPURISCVState {
target_ulong stval_hs;
target_ulong satp_hs;
target_ulong mstatus_hs;
#ifdef TARGET_RISCV32
target_ulong mstatush_hs;
#endif
target_ulong scounteren;
target_ulong mcounteren;

3
target/riscv/cpu_bits.h
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@ -135,6 +135,9 @@
#define CSR_MTVEC 0x305
#define CSR_MCOUNTEREN 0x306
/* 32-bit only */
#define CSR_MSTATUSH 0x310
/* Legacy Counter Setup (priv v1.9.1) */
/* Update to #define CSR_MCOUNTINHIBIT 0x320 for 1.11.0 */
#define CSR_MUCOUNTEREN 0x320

17
target/riscv/cpu_helper.c
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@ -126,6 +126,11 @@ void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env)
env->mstatus &= ~mstatus_mask;
env->mstatus |= env->mstatus_hs;
#if defined(TARGET_RISCV32)
env->vsstatush = env->mstatush;
env->mstatush |= env->mstatush_hs;
#endif
env->vstvec = env->stvec;
env->stvec = env->stvec_hs;
@ -149,6 +154,11 @@ void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env)
env->mstatus &= ~mstatus_mask;
env->mstatus |= env->vsstatus;
#if defined(TARGET_RISCV32)
env->mstatush_hs = env->mstatush;
env->mstatush |= env->vsstatush;
#endif
env->stvec_hs = env->stvec;
env->stvec = env->vstvec;
@ -939,10 +949,17 @@ void riscv_cpu_do_interrupt(CPUState *cs)
if (riscv_cpu_virt_enabled(env)) {
riscv_cpu_swap_hypervisor_regs(env);
}
#ifdef TARGET_RISCV32
env->mstatush = set_field(env->mstatush, MSTATUS_MPV,
riscv_cpu_virt_enabled(env));
env->mstatush = set_field(env->mstatush, MSTATUS_MTL,
riscv_cpu_force_hs_excep_enabled(env));
#else
env->mstatus = set_field(env->mstatus, MSTATUS_MPV,
riscv_cpu_virt_enabled(env));
env->mstatus = set_field(env->mstatus, MSTATUS_MTL,
riscv_cpu_force_hs_excep_enabled(env));
#endif
mtval2 = env->guest_phys_fault_addr;

25
target/riscv/csr.c
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@ -371,6 +371,27 @@ static int write_mstatus(CPURISCVState *env, int csrno, target_ulong val)
return 0;
}
#ifdef TARGET_RISCV32
static int read_mstatush(CPURISCVState *env, int csrno, target_ulong *val)
{
*val = env->mstatush;
return 0;
}
static int write_mstatush(CPURISCVState *env, int csrno, target_ulong val)
{
if ((val ^ env->mstatush) & (MSTATUS_MPV)) {
tlb_flush(env_cpu(env));
}
val &= MSTATUS_MPV | MSTATUS_MTL;
env->mstatush = val;
return 0;
}
#endif
static int read_misa(CPURISCVState *env, int csrno, target_ulong *val)
{
*val = env->misa;
@ -1214,6 +1235,10 @@ static riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
[CSR_MTVEC] = { any, read_mtvec, write_mtvec },
[CSR_MCOUNTEREN] = { any, read_mcounteren, write_mcounteren },
#if defined(TARGET_RISCV32)
[CSR_MSTATUSH] = { any, read_mstatush, write_mstatush },
#endif
/* Legacy Counter Setup (priv v1.9.1) */
[CSR_MUCOUNTEREN] = { any, read_mucounteren, write_mucounteren },
[CSR_MSCOUNTEREN] = { any, read_mscounteren, write_mscounteren },

4
target/riscv/op_helper.c
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@ -153,7 +153,11 @@ target_ulong helper_mret(CPURISCVState *env, target_ulong cpu_pc_deb)
get_field(mstatus, MSTATUS_MPIE));
mstatus = set_field(mstatus, MSTATUS_MPIE, 1);
mstatus = set_field(mstatus, MSTATUS_MPP, PRV_U);
#ifdef TARGET_RISCV32
env->mstatush = set_field(env->mstatush, MSTATUS_MPV, 0);
#else
mstatus = set_field(mstatus, MSTATUS_MPV, 0);
#endif
env->mstatus = mstatus;
riscv_cpu_set_mode(env, prev_priv);