From: Erlon Cruz <erlon.c...@br.flextronics.com>
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.c...@br.flextronics.com>
---
hw/spapr_hcall.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/hw/spapr_hcall.c b/hw/spapr_hcall.c
index 2889742..56394a1 100644
--- a/hw/spapr_hcall.c
+++ b/hw/spapr_hcall.c
@@ -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)
{
@@ -714,6 +744,7 @@ 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);
--
1.7.9.5
