motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-04 00:03:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

PPC: move TLBs to their own arrays

Browse source 
Until now, we've created a union over multiple different TLB types and
allocated that union. While it's a waste of memory (and cache) to allocate
TLB information for a TLB type with much information when you only need
little, it also inflicts another issue.

With the new KVM API, we can now share the TLB between KVM and qemu, but
for that to work we need to have both be in the same layout. We can't just
stretch it over to fit some internal different TLB representation.

Hence this patch moves all TLB types to their own array, allowing us to only
address and allocate exactly the boundaries required for the specific TLB
type at hand.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2011-06-17 01:00:28 +02:00
parent 0dd4bc7dd4
commit 1c53acccee
6 changed files with 69 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

27
target-ppc/translate_init.c
View file

@ -844,6 +844,7 @@ static void gen_6xx_7xx_soft_tlb (CPUPPCState *env, int nb_tlbs, int nb_ways)
env->nb_tlb = nb_tlbs;
env->nb_ways = nb_ways;
env->id_tlbs = 1;
env->tlb_type = TLB_6XX;
spr_register(env, SPR_DMISS, "DMISS",
SPR_NOACCESS, SPR_NOACCESS,
&spr_read_generic, SPR_NOACCESS,
@ -1337,6 +1338,7 @@ static void gen_74xx_soft_tlb (CPUPPCState *env, int nb_tlbs, int nb_ways)
env->nb_tlb = nb_tlbs;
env->nb_ways = nb_ways;
env->id_tlbs = 1;
env->tlb_type = TLB_6XX;
/* XXX : not implemented */
spr_register(env, SPR_PTEHI, "PTEHI",
SPR_NOACCESS, SPR_NOACCESS,
@ -3282,6 +3284,7 @@ static void init_proc_401x2 (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_4xx_softmmu(env);
env->dcache_line_size = 32;
@ -3352,6 +3355,7 @@ static void init_proc_IOP480 (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_4xx_softmmu(env);
env->dcache_line_size = 32;
@ -3431,6 +3435,7 @@ static void init_proc_403GCX (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_4xx_softmmu(env);
env->dcache_line_size = 32;
@ -3479,6 +3484,7 @@ static void init_proc_405 (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_4xx_softmmu(env);
env->dcache_line_size = 32;
@ -3561,6 +3567,7 @@ static void init_proc_440EP (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_BookE(env);
env->dcache_line_size = 32;
@ -3624,6 +3631,7 @@ static void init_proc_440GP (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_BookE(env);
env->dcache_line_size = 32;
@ -3687,6 +3695,7 @@ static void init_proc_440x4 (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_BookE(env);
env->dcache_line_size = 32;
@ -3767,6 +3776,7 @@ static void init_proc_440x5 (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_BookE(env);
env->dcache_line_size = 32;
@ -3854,6 +3864,7 @@ static void init_proc_460 (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_BookE(env);
env->dcache_line_size = 32;
@ -3944,6 +3955,7 @@ static void init_proc_460F (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_BookE(env);
env->dcache_line_size = 32;
@ -4251,6 +4263,7 @@ static void init_proc_e200 (CPUPPCState *env)
env->nb_tlb = 64;
env->nb_ways = 1;
env->id_tlbs = 0;
env->tlb_type = TLB_EMB;
#endif
init_excp_e200(env);
env->dcache_line_size = 32;
@ -4464,6 +4477,7 @@ static void init_proc_e500 (CPUPPCState *env, int version)
#if !defined(CONFIG_USER_ONLY)
env->nb_tlb = 0;
env->tlb_type = TLB_MAS;
for (i = 0; i < BOOKE206_MAX_TLBN; i++) {
env->nb_tlb += booke206_tlb_size(env, i);
}
@ -9186,6 +9200,7 @@ static void init_ppc_proc (CPUPPCState *env, const ppc_def_t *def)
env->nb_BATs = 0;
env->nb_tlb = 0;
env->nb_ways = 0;
env->tlb_type = TLB_NONE;
#endif
/* Register SPR common to all PowerPC implementations */
gen_spr_generic(env);
@ -9310,7 +9325,17 @@ static void init_ppc_proc (CPUPPCState *env, const ppc_def_t *def)
int nb_tlb = env->nb_tlb;
if (env->id_tlbs != 0)
nb_tlb *= 2;
env->tlb = qemu_mallocz(nb_tlb * sizeof(ppc_tlb_t));
switch (env->tlb_type) {
case TLB_6XX:
env->tlb.tlb6 = qemu_mallocz(nb_tlb * sizeof(ppc6xx_tlb_t));
break;
case TLB_EMB:
env->tlb.tlbe = qemu_mallocz(nb_tlb * sizeof(ppcemb_tlb_t));
break;
case TLB_MAS:
env->tlb.tlbm = qemu_mallocz(nb_tlb * sizeof(ppcmas_tlb_t));
break;
}
/* Pre-compute some useful values */
env->tlb_per_way = env->nb_tlb / env->nb_ways;
}