From 7fc37962192edfc64aea22130afc2ca8dd15928e Mon Sep 17 00:00:00 2001 From: Daniel Henrique Barboza Date: Mon, 18 Dec 2023 09:53:10 -0300 Subject: [PATCH] target/riscv/tcg: do not use "!generic" CPU checks Our current logic in get/setters of MISA and multi-letter extensions works because we have only 2 CPU types, generic and vendor, and by using "!generic" we're implying that we're talking about vendor CPUs. When adding a third CPU type this logic will break so let's handle it beforehand. In set_misa_ext_cfg() and set_multi_ext_cfg(), check for "vendor" cpu instead of "not generic". The "generic CPU" checks remaining are from riscv_cpu_add_misa_properties() and cpu_add_multi_ext_prop() before applying default values for the extensions. This leaves us with: - vendor CPUs will not allow extension enablement, all other CPUs will; - generic CPUs will inherit default values for extensions, all others won't. And now we can add a new, third CPU type, that will allow extensions to be enabled and will not inherit defaults, without changing the existing logic. Signed-off-by: Daniel Henrique Barboza Reviewed-by: Andrew Jones Reviewed-by: Alistair Francis Message-ID: <20231218125334.37184-3-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis --- target/riscv/tcg/tcg-cpu.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c index 29b5a88931..7174abb7f5 100644 --- a/target/riscv/tcg/tcg-cpu.c +++ b/target/riscv/tcg/tcg-cpu.c @@ -668,6 +668,11 @@ static bool riscv_cpu_is_generic(Object *cpu_obj) return object_dynamic_cast(cpu_obj, TYPE_RISCV_DYNAMIC_CPU) != NULL; } +static bool riscv_cpu_is_vendor(Object *cpu_obj) +{ + return object_dynamic_cast(cpu_obj, TYPE_RISCV_VENDOR_CPU) != NULL; +} + /* * We'll get here via the following path: * @@ -736,7 +741,7 @@ static void cpu_set_misa_ext_cfg(Object *obj, Visitor *v, const char *name, target_ulong misa_bit = misa_ext_cfg->misa_bit; RISCVCPU *cpu = RISCV_CPU(obj); CPURISCVState *env = &cpu->env; - bool generic_cpu = riscv_cpu_is_generic(obj); + bool vendor_cpu = riscv_cpu_is_vendor(obj); bool prev_val, value; if (!visit_type_bool(v, name, &value, errp)) { @@ -750,7 +755,7 @@ static void cpu_set_misa_ext_cfg(Object *obj, Visitor *v, const char *name, } if (value) { - if (!generic_cpu) { + if (vendor_cpu) { g_autofree char *cpuname = riscv_cpu_get_name(cpu); error_setg(errp, "'%s' CPU does not allow enabling extensions", cpuname); @@ -855,7 +860,7 @@ static void cpu_set_multi_ext_cfg(Object *obj, Visitor *v, const char *name, { const RISCVCPUMultiExtConfig *multi_ext_cfg = opaque; RISCVCPU *cpu = RISCV_CPU(obj); - bool generic_cpu = riscv_cpu_is_generic(obj); + bool vendor_cpu = riscv_cpu_is_vendor(obj); bool prev_val, value; if (!visit_type_bool(v, name, &value, errp)) { @@ -879,7 +884,7 @@ static void cpu_set_multi_ext_cfg(Object *obj, Visitor *v, const char *name, return; } - if (value && !generic_cpu) { + if (value && vendor_cpu) { g_autofree char *cpuname = riscv_cpu_get_name(cpu); error_setg(errp, "'%s' CPU does not allow enabling extensions", cpuname);