On 12/1/21 00:01, Fabiano Rosas wrote:
> The e600 CPU is a successor of the 7448 and like all the 7450s CPUs,
> it has an optional software TLB feature.
>
> We have determined that there is no OS software support for the 7450
> software TLB available these days. See the previous commit for more
> information.
>
> This patch disables the SPRs and instructions related to software TLB
> from the e600 CPU.
>
> No functional change intended. These facilities should be used by the
> OS in interrupt handlers for interrupts that QEMU never generates.
>
> Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Thanks,
C.
> ---
> target/ppc/cpu_init.c | 6 +-----
> 1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
> index 509df35d09..962acf295f 100644
> --- a/target/ppc/cpu_init.c
> +++ b/target/ppc/cpu_init.c
> @@ -2537,9 +2537,6 @@ static void init_excp_7450(CPUPPCState *env)
> env->excp_vectors[POWERPC_EXCP_TRACE] = 0x00000D00;
> env->excp_vectors[POWERPC_EXCP_PERFM] = 0x00000F00;
> env->excp_vectors[POWERPC_EXCP_VPU] = 0x00000F20;
> - env->excp_vectors[POWERPC_EXCP_IFTLB] = 0x00001000;
> - env->excp_vectors[POWERPC_EXCP_DLTLB] = 0x00001100;
> - env->excp_vectors[POWERPC_EXCP_DSTLB] = 0x00001200;
> env->excp_vectors[POWERPC_EXCP_IABR] = 0x00001300;
> env->excp_vectors[POWERPC_EXCP_SMI] = 0x00001400;
> env->excp_vectors[POWERPC_EXCP_VPUA] = 0x00001600;
> @@ -6643,7 +6640,6 @@ static void init_proc_e600(CPUPPCState *env)
> /* Memory management */
> register_low_BATs(env);
> register_high_BATs(env);
> - register_74xx_soft_tlb(env, 128, 2);
> init_excp_7450(env);
> env->dcache_line_size = 32;
> env->icache_line_size = 32;
> @@ -6667,7 +6663,7 @@ POWERPC_FAMILY(e600)(ObjectClass *oc, void *data)
> PPC_CACHE_DCBA | PPC_CACHE_DCBZ |
> PPC_MEM_SYNC | PPC_MEM_EIEIO |
> PPC_MEM_TLBIE | PPC_MEM_TLBSYNC |
> - PPC_MEM_TLBIA | PPC_74xx_TLB |
> + PPC_MEM_TLBIA |
> PPC_SEGMENT | PPC_EXTERN |
> PPC_ALTIVEC;
> pcc->insns_flags2 = PPC_NONE;
>