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target/riscv/tcg: update priv_ver on user_set extensions

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We'll add a new bare CPU type that won't have any default priv_ver. This
means that the CPU will default to priv_ver = 0, i.e. 1.10.0.

At the same we'll allow these CPUs to enable extensions at will, but
then, if the extension has a priv_ver newer than 1.10, we'll end up
disabling it. Users will then need to manually set priv_ver to something
other than 1.10 to enable the extensions they want, which is not ideal.

Change the setter() of extensions to allow user enabled extensions to
bump the priv_ver of the CPU. This will make it convenient for users to
enable extensions for CPUs that doesn't set a default priv_ver.

This change does not affect any existing CPU: vendor CPUs does not allow
extensions to be enabled, and generic CPUs are already set to priv_ver
LATEST.

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: <20231218125334.37184-4-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Daniel Henrique Barboza 2023-12-18 09:53:11 -03:00 committed by Alistair Francis
parent 7fc3796219
commit fdcefa91a1
1 changed files with 32 additions and 0 deletions
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32
target/riscv/tcg/tcg-cpu.c
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@ -114,6 +114,26 @@ static int cpu_cfg_ext_get_min_version(uint32_t ext_offset)
g_assert_not_reached();
}
static void cpu_bump_multi_ext_priv_ver(CPURISCVState *env,
uint32_t ext_offset)
{
int ext_priv_ver;
if (env->priv_ver == PRIV_VERSION_LATEST) {
return;
}
ext_priv_ver = cpu_cfg_ext_get_min_version(ext_offset);
if (env->priv_ver < ext_priv_ver) {
/*
* Note: the 'priv_spec' command line option, if present,
* will take precedence over this priv_ver bump.
*/
env->priv_ver = ext_priv_ver;
}
}
static void cpu_cfg_ext_auto_update(RISCVCPU *cpu, uint32_t ext_offset,
bool value)
{
@ -762,6 +782,14 @@ static void cpu_set_misa_ext_cfg(Object *obj, Visitor *v, const char *name,
return;
}
if (misa_bit == RVH && env->priv_ver < PRIV_VERSION_1_12_0) {
/*
* Note: the 'priv_spec' command line option, if present,
* will take precedence over this priv_ver bump.
*/
env->priv_ver = PRIV_VERSION_1_12_0;
}
env->misa_ext |= misa_bit;
env->misa_ext_mask |= misa_bit;
} else {
@ -891,6 +919,10 @@ static void cpu_set_multi_ext_cfg(Object *obj, Visitor *v, const char *name,
return;
}
if (value) {
cpu_bump_multi_ext_priv_ver(&cpu->env, multi_ext_cfg->offset);
}
isa_ext_update_enabled(cpu, multi_ext_cfg->offset, value);
}