From ff2cc1294cd8179d87de299b8e7a16bdb1e69523 Mon Sep 17 00:00:00 2001 From: Alistair Francis Date: Fri, 31 Jan 2020 17:02:04 -0800 Subject: [PATCH] target/riscv: Add Hypervisor CSR access functions Signed-off-by: Alistair Francis Reviewed-by: Palmer Dabbelt Signed-off-by: Palmer Dabbelt --- target/riscv/csr.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 134 insertions(+), 2 deletions(-) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index c63b2f980c..bee639e92e 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -98,6 +98,20 @@ static int smode(CPURISCVState *env, int csrno) return -!riscv_has_ext(env, RVS); } +static int hmode(CPURISCVState *env, int csrno) +{ + if (riscv_has_ext(env, RVS) && + riscv_has_ext(env, RVH)) { + /* Hypervisor extension is supported */ + if ((env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) || + env->priv == PRV_M) { + return 0; + } + } + + return -1; +} + static int pmp(CPURISCVState *env, int csrno) { return -!riscv_feature(env, RISCV_FEATURE_PMP); @@ -226,8 +240,9 @@ static int read_timeh(CPURISCVState *env, int csrno, target_ulong *val) /* Machine constants */ -#define M_MODE_INTERRUPTS (MIP_MSIP | MIP_MTIP | MIP_MEIP) -#define S_MODE_INTERRUPTS (MIP_SSIP | MIP_STIP | MIP_SEIP) +#define M_MODE_INTERRUPTS (MIP_MSIP | MIP_MTIP | MIP_MEIP) +#define S_MODE_INTERRUPTS (MIP_SSIP | MIP_STIP | MIP_SEIP) +#define VS_MODE_INTERRUPTS (MIP_VSSIP | MIP_VSTIP | MIP_VSEIP) static const target_ulong delegable_ints = S_MODE_INTERRUPTS; static const target_ulong all_ints = M_MODE_INTERRUPTS | S_MODE_INTERRUPTS; @@ -257,6 +272,7 @@ static const target_ulong sstatus_v1_10_mask = SSTATUS_SIE | SSTATUS_SPIE | SSTATUS_UIE | SSTATUS_UPIE | SSTATUS_SPP | SSTATUS_FS | SSTATUS_XS | SSTATUS_SUM | SSTATUS_MXR | SSTATUS_SD; static const target_ulong sip_writable_mask = SIP_SSIP | MIP_USIP | MIP_UEIP; +static const target_ulong hip_writable_mask = MIP_VSSIP | MIP_VSTIP | MIP_VSEIP; #if defined(TARGET_RISCV32) static const char valid_vm_1_09[16] = { @@ -756,6 +772,112 @@ static int write_satp(CPURISCVState *env, int csrno, target_ulong val) return 0; } +/* Hypervisor Extensions */ +static int read_hstatus(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = env->hstatus; + return 0; +} + +static int write_hstatus(CPURISCVState *env, int csrno, target_ulong val) +{ + env->hstatus = val; + return 0; +} + +static int read_hedeleg(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = env->hedeleg; + return 0; +} + +static int write_hedeleg(CPURISCVState *env, int csrno, target_ulong val) +{ + env->hedeleg = val; + return 0; +} + +static int read_hideleg(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = env->hideleg; + return 0; +} + +static int write_hideleg(CPURISCVState *env, int csrno, target_ulong val) +{ + env->hideleg = val; + return 0; +} + +static int rmw_hip(CPURISCVState *env, int csrno, target_ulong *ret_value, + target_ulong new_value, target_ulong write_mask) +{ + int ret = rmw_mip(env, 0, ret_value, new_value, + write_mask & hip_writable_mask); + + return ret; +} + +static int read_hie(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = env->mie & VS_MODE_INTERRUPTS; + return 0; +} + +static int write_hie(CPURISCVState *env, int csrno, target_ulong val) +{ + target_ulong newval = (env->mie & ~VS_MODE_INTERRUPTS) | (val & VS_MODE_INTERRUPTS); + return write_mie(env, CSR_MIE, newval); +} + +static int read_hcounteren(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = env->hcounteren; + return 0; +} + +static int write_hcounteren(CPURISCVState *env, int csrno, target_ulong val) +{ + env->hcounteren = val; + return 0; +} + +static int read_htval(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = env->htval; + return 0; +} + +static int write_htval(CPURISCVState *env, int csrno, target_ulong val) +{ + env->htval = val; + return 0; +} + +static int read_htinst(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = env->htinst; + return 0; +} + +static int write_htinst(CPURISCVState *env, int csrno, target_ulong val) +{ + env->htinst = val; + return 0; +} + +static int read_hgatp(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = env->hgatp; + return 0; +} + +static int write_hgatp(CPURISCVState *env, int csrno, target_ulong val) +{ + env->hgatp = val; + return 0; +} + /* Physical Memory Protection */ static int read_pmpcfg(CPURISCVState *env, int csrno, target_ulong *val) { @@ -959,6 +1081,16 @@ static riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = { /* Supervisor Protection and Translation */ [CSR_SATP] = { smode, read_satp, write_satp }, + [CSR_HSTATUS] = { hmode, read_hstatus, write_hstatus }, + [CSR_HEDELEG] = { hmode, read_hedeleg, write_hedeleg }, + [CSR_HIDELEG] = { hmode, read_hideleg, write_hideleg }, + [CSR_HIP] = { hmode, NULL, NULL, rmw_hip }, + [CSR_HIE] = { hmode, read_hie, write_hie }, + [CSR_HCOUNTEREN] = { hmode, read_hcounteren, write_hcounteren }, + [CSR_HTVAL] = { hmode, read_htval, write_htval }, + [CSR_HTINST] = { hmode, read_htinst, write_htinst }, + [CSR_HGATP] = { hmode, read_hgatp, write_hgatp }, + /* Physical Memory Protection */ [CSR_PMPCFG0 ... CSR_PMPADDR9] = { pmp, read_pmpcfg, write_pmpcfg }, [CSR_PMPADDR0 ... CSR_PMPADDR15] = { pmp, read_pmpaddr, write_pmpaddr }, -- 2.11.0