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pseries: Implement h_read hcall

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This h_call is useful for DLPAR in future amongst other things. Given an index
it fetches the corresponding PTE stored in the htab.

Signed-off-by: Erlon Cruz <erlon.cruz@br.flextronics.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Erlon Cruz 2013-02-18 05:00:32 +00:00 committed by Alexander Graf
parent befa8af375
commit 6bbd5dde9a
1 changed files with 31 additions and 0 deletions
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31
hw/spapr_hcall.c
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@ -323,6 +323,36 @@ static target_ulong h_protect(PowerPCCPU *cpu, sPAPREnvironment *spapr,
return H_SUCCESS;
}
static target_ulong h_read(PowerPCCPU *cpu, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
CPUPPCState *env = &cpu->env;
target_ulong flags = args[0];
target_ulong pte_index = args[1];
uint8_t *hpte;
int i, ridx, n_entries = 1;
if ((pte_index * HASH_PTE_SIZE_64) & ~env->htab_mask) {
return H_PARAMETER;
}
if (flags & H_READ_4) {
/* Clear the two low order bits */
pte_index &= ~(3ULL);
n_entries = 4;
}
hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);
for (i = 0, ridx = 0; i < n_entries; i++) {
args[ridx++] = ldq_p(hpte);
args[ridx++] = ldq_p(hpte + (HASH_PTE_SIZE_64/2));
hpte += HASH_PTE_SIZE_64;
}
return H_SUCCESS;
}
static target_ulong h_set_dabr(PowerPCCPU *cpu, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
@ -710,6 +740,7 @@ static void hypercall_register_types(void)
spapr_register_hypercall(H_ENTER, h_enter);
spapr_register_hypercall(H_REMOVE, h_remove);
spapr_register_hypercall(H_PROTECT, h_protect);
spapr_register_hypercall(H_READ, h_read);
/* hcall-bulk */
spapr_register_hypercall(H_BULK_REMOVE, h_bulk_remove);