On Fri, 22 Aug 2025 at 16:17, Luc Michel <[email protected]> wrote:
>
> Add support for the ARM Cortex-A78AE CPU.
>
> Signed-off-by: Luc Michel <[email protected]>
> ---
> target/arm/tcg/cpu64.c | 79 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 79 insertions(+)
>
> diff --git a/target/arm/tcg/cpu64.c b/target/arm/tcg/cpu64.c
> index 35cddbafa4c..b56677c1a5d 100644
> --- a/target/arm/tcg/cpu64.c
> +++ b/target/arm/tcg/cpu64.c
> @@ -404,10 +404,84 @@ static void aarch64_a76_initfn(Object *obj)
>
> /* From D5.1 AArch64 PMU register summary */
> cpu->isar.reset_pmcr_el0 = 0x410b3000;
> }
>
> +static void aarch64_a78ae_initfn(Object *obj)
> +{
> + ARMCPU *cpu = ARM_CPU(obj);
> + ARMISARegisters *isar = &cpu->isar;
> +
> + cpu->dtb_compatible = "arm,cortex-a78ae";
> + set_feature(&cpu->env, ARM_FEATURE_V8);
> + set_feature(&cpu->env, ARM_FEATURE_NEON);
> + set_feature(&cpu->env, ARM_FEATURE_GENERIC_TIMER);
> + set_feature(&cpu->env, ARM_FEATURE_BACKCOMPAT_CNTFRQ);
>From cpu.h:
/*
* ARM_FEATURE_BACKCOMPAT_CNTFRQ makes the CPU default cntfrq be 62.5MHz
* if the board doesn't set a value, instead of 1GHz. It is for backwards
* compatibility and used only with CPU definitions that were already
* in QEMU before we changed the default. It should not be set on any
* CPU types added in future.
*/
This is a new CPU type, so don't set this.
> + set_feature(&cpu->env, ARM_FEATURE_AARCH64);
> + set_feature(&cpu->env, ARM_FEATURE_CBAR_RO);
The TRM says this CPU doesn't have a CBAR register, so
don't set this.
> + set_feature(&cpu->env, ARM_FEATURE_EL2);
> + set_feature(&cpu->env, ARM_FEATURE_EL3);
> + set_feature(&cpu->env, ARM_FEATURE_PMU);
> +
> + /* Ordered by B2.4 AArch64 registers by functional group */
There is no B2.4 in the Cortex-A78AE TRM. Please don't
just cut-and-paste things from other CPU definitions.
Similarly for other comments here referencing TRM sections.
In this case what you want is section 3.2.4.
> + SET_IDREG(isar, CLIDR, 0x82000023);
> + cpu->ctr = 0x9444c004;
> + cpu->dcz_blocksize = 4;
> + SET_IDREG(isar, ID_AA64DFR0, 0x0000000110305408ull);
> + SET_IDREG(isar, ID_AA64ISAR0, 0x0010100010211120ull);
> + SET_IDREG(isar, ID_AA64ISAR1, 0x0000000001200031ull);
> + SET_IDREG(isar, ID_AA64MMFR0, 0x0000000000101125ull);
> + SET_IDREG(isar, ID_AA64MMFR1, 0x0000000010212122ull);
> + SET_IDREG(isar, ID_AA64MMFR2, 0x0000000100001011ull);
> + SET_IDREG(isar, ID_AA64PFR0, 0x1100000010111112ull); /* GIC filled in
> later */
> + SET_IDREG(isar, ID_AA64PFR1, 0x0000000000000010ull);
> + SET_IDREG(isar, ID_AFR0, 0x00000000);
> + SET_IDREG(isar, ID_DFR0, 0x04010088);
> + SET_IDREG(isar, ID_ISAR0, 0x02101110);
> + SET_IDREG(isar, ID_ISAR1, 0x13112111);
> + SET_IDREG(isar, ID_ISAR2, 0x21232042);
> + SET_IDREG(isar, ID_ISAR3, 0x01112131);
> + SET_IDREG(isar, ID_ISAR4, 0x00010142);
> + SET_IDREG(isar, ID_ISAR5, 0x01011121);
> + SET_IDREG(isar, ID_ISAR6, 0x00000010);
> + SET_IDREG(isar, ID_MMFR0, 0x10201105);
> + SET_IDREG(isar, ID_MMFR1, 0x40000000);
> + SET_IDREG(isar, ID_MMFR2, 0x01260000);
> + SET_IDREG(isar, ID_MMFR3, 0x02122211);
> + SET_IDREG(isar, ID_MMFR4, 0x00021110);
> + SET_IDREG(isar, ID_PFR0, 0x10010131);
> + SET_IDREG(isar, ID_PFR1, 0x00010000); /* GIC filled in later */
> + SET_IDREG(isar, ID_PFR2, 0x00000011);
> + cpu->midr = 0x410fd421; /* r0p1 */
r0p3 is the latest...
> + cpu->revidr = 0;
> +
> + /* From B2.18 CCSIDR_EL1 */
> + /* 64KB L1 dcache */
> + cpu->ccsidr[0] = make_ccsidr(CCSIDR_FORMAT_LEGACY, 4, 64, 64 * KiB, 7);
> + /* 64KB L1 icache */
> + cpu->ccsidr[1] = make_ccsidr(CCSIDR_FORMAT_LEGACY, 4, 64, 64 * KiB, 2);
> + /* 512KB L2 cache */
> + cpu->ccsidr[2] = make_ccsidr(CCSIDR_FORMAT_LEGACY, 8, 64, 512 * KiB, 7);
> +
> + /* From B2.93 SCTLR_EL3 */
> + cpu->reset_sctlr = 0x30c50838;
> +
> + /* From B4.23 ICH_VTR_EL2 */
> + cpu->gic_num_lrs = 4;
> + cpu->gic_vpribits = 5;
> + cpu->gic_vprebits = 5;
> + cpu->gic_pribits = 5;
> +
> + /* From B5.1 AdvSIMD AArch64 register summary */
> + cpu->isar.mvfr0 = 0x10110222;
> + cpu->isar.mvfr1 = 0x13211111;
> + cpu->isar.mvfr2 = 0x00000043;
> +
> + /* From D5.1 AArch64 PMU register summary */
> + cpu->isar.reset_pmcr_el0 = 0x41223000;
> +}
The register values look OK; checked against the TRM.
thanks
-- PMM
