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[Qemu-devel] [PATCH] pseries: Implements h_read hcall


From: Erlon Cruz
Subject: [Qemu-devel] [PATCH] pseries: Implements h_read hcall
Date: Thu, 7 Feb 2013 09:28:20 -0200

From: Erlon Cruz <address@hidden>

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 <address@hidden>
---
 hw/spapr_hcall.c |   58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/hw/spapr_hcall.c b/hw/spapr_hcall.c
index 2889742..5ba07e5 100644
--- a/hw/spapr_hcall.c
+++ b/hw/spapr_hcall.c
@@ -323,6 +323,63 @@ 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;
+
+    if ((pte_index * HASH_PTE_SIZE_64) & ~env->htab_mask) {
+        return H_PARAMETER;
+    }
+
+    if (!(flags & H_READ_4)) {
+        target_ulong v, r;
+        target_ulong *pteh = &args[0];
+        target_ulong *ptel = &args[1];
+
+        hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);
+
+        v = ldq_p(hpte);
+        r = ldq_p(hpte + (HASH_PTE_SIZE_64/2));
+
+        if (flags & H_R_XLATE) {
+            /* FIXME:  include a valid logical page num in the pte */
+            ;
+        }
+
+        *pteh = v;
+        *ptel = r;
+
+    } else {
+        int i, ridx = 0;
+        target_ulong v[4], r[4];
+
+        /* Clear the two low order bits */
+        pte_index &= ~(3ULL);
+        hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);
+
+        for (i = 0; i < 4; i++) {
+            v[i] = ldq_p(hpte);
+            r[i] = ldq_p(hpte + (HASH_PTE_SIZE_64/2));
+
+            if (flags & H_R_XLATE) {
+                /* FIXME:  include a valid logical page num in the pte */
+                ;
+            }
+
+            args[ridx++] = v[i];
+            args[ridx++] = r[i];
+
+            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 +771,7 @@ 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




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