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target/riscv: Add Smrnmi cpu extension

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This adds the properties for ISA extension Smrnmi.

Also, when Smrnmi is present, the firmware (e.g., OpenSBI) must set
mnstatus.NMIE to 1 before enabling any interrupts. Otherwise, all
interrupts will be disabled. Since our current OpenSBI does not
support Smrnmi yet, let's disable Smrnmi for the 'max' type CPU for
now. We can re-enable it once OpenSBI includes proper support for it.

Signed-off-by: Frank Chang <frank.chang@sifive.com>
Signed-off-by: Tommy Wu <tommy.wu@sifive.com>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250106054336.1878291-6-frank.chang@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Tommy Wu 2025-01-06 13:43:35 +08:00 committed by Alistair Francis
parent 3157a553ec
commit f9653d4eb2
2 changed files with 11 additions and 0 deletions
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2
target/riscv/cpu.c
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@ -193,6 +193,7 @@ const RISCVIsaExtData isa_edata_arr[] = {
ISA_EXT_DATA_ENTRY(smaia, PRIV_VERSION_1_12_0, ext_smaia),
ISA_EXT_DATA_ENTRY(smcntrpmf, PRIV_VERSION_1_12_0, ext_smcntrpmf),
ISA_EXT_DATA_ENTRY(smepmp, PRIV_VERSION_1_12_0, ext_smepmp),
ISA_EXT_DATA_ENTRY(smrnmi, PRIV_VERSION_1_12_0, ext_smrnmi),
ISA_EXT_DATA_ENTRY(smmpm, PRIV_VERSION_1_13_0, ext_smmpm),
ISA_EXT_DATA_ENTRY(smnpm, PRIV_VERSION_1_13_0, ext_smnpm),
ISA_EXT_DATA_ENTRY(smstateen, PRIV_VERSION_1_12_0, ext_smstateen),
@ -1614,6 +1615,7 @@ const RISCVCPUMultiExtConfig riscv_cpu_extensions[] = {
MULTI_EXT_CFG_BOOL("smaia", ext_smaia, false),
MULTI_EXT_CFG_BOOL("smepmp", ext_smepmp, false),
MULTI_EXT_CFG_BOOL("smrnmi", ext_smrnmi, false),
MULTI_EXT_CFG_BOOL("smmpm", ext_smmpm, false),
MULTI_EXT_CFG_BOOL("smnpm", ext_smnpm, false),
MULTI_EXT_CFG_BOOL("smstateen", ext_smstateen, false),

9
target/riscv/tcg/tcg-cpu.c
View File

@ -1430,6 +1430,15 @@ static void riscv_init_max_cpu_extensions(Object *obj)
if (env->misa_mxl != MXL_RV32) {
isa_ext_update_enabled(cpu, CPU_CFG_OFFSET(ext_zcf), false);
}
/*
* ext_smrnmi requires OpenSBI changes that our current
* image does not have. Disable it for now.
*/
if (cpu->cfg.ext_smrnmi) {
isa_ext_update_enabled(cpu, CPU_CFG_OFFSET(ext_smrnmi), false);
qemu_log("Smrnmi is disabled in the 'max' type CPU\n");
}
}
static bool riscv_cpu_has_max_extensions(Object *cpu_obj)