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target/riscv: add 'rva22u64' CPU

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This CPU was suggested by Alistair [1] and others during the profile
design discussions. It consists of the bare 'rv64i' CPU with rva22u64
enabled by default, like an alias of '-cpu rv64i,rva22u64=true'.

Users now have an even easier way of consuming this user-mode profile by
doing '-cpu rva22u64'. Extensions can be enabled/disabled at will on top
of it.

We can boot Linux with this "user-mode" CPU by doing:

-cpu rva22u64,sv39=true,s=true,zifencei=true

[1] https://lore.kernel.org/qemu-riscv/CAKmqyKP7xzZ9Sx=-Lbx2Ob0qCfB7Z+JO944FQ2TQ+49mqo0q_Q@mail.gmail.com/

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20231218125334.37184-19-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Daniel Henrique Barboza 2023-12-18 09:53:26 -03:00 • committed by Alistair Francis
parent 6394b67615
commit fba92a92e3
3 changed files with 27 additions and 0 deletions
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17
target/riscv/cpu.c
View file

@ -1575,6 +1575,15 @@ static Property riscv_cpu_properties[] = {
DEFINE_PROP_END_OF_LIST(),
};
#if defined(TARGET_RISCV64)
static void rva22u64_profile_cpu_init(Object *obj)
{
rv64i_bare_cpu_init(obj);
RVA22U64.enabled = true;
}
#endif
static const gchar *riscv_gdb_arch_name(CPUState *cs)
{
RISCVCPU *cpu = RISCV_CPU(cs);
@ -1836,6 +1845,13 @@ char *riscv_isa_string(RISCVCPU *cpu)
.instance_init = initfn \
}
#define DEFINE_PROFILE_CPU(type_name, initfn) \
{ \
.name = type_name, \
.parent = TYPE_RISCV_BARE_CPU, \
.instance_init = initfn \
}
static const TypeInfo riscv_cpu_type_infos[] = {
{
.name = TYPE_RISCV_CPU,
@ -1880,6 +1896,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
DEFINE_VENDOR_CPU(TYPE_RISCV_CPU_VEYRON_V1, rv64_veyron_v1_cpu_init),
DEFINE_DYNAMIC_CPU(TYPE_RISCV_CPU_BASE128, rv128_base_cpu_init),
DEFINE_BARE_CPU(TYPE_RISCV_CPU_RV64I, rv64i_bare_cpu_init),
DEFINE_PROFILE_CPU(TYPE_RISCV_CPU_RVA22U64, rva22u64_profile_cpu_init),
#endif
};