1 files changed, 22 insertions, 98 deletions

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 5d4bd2b..4967aa7 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -724,120 +724,44 @@ static Aml *aml_pci_pdsm(void)
     return method;
 }
 
-/**
- * build_prt_entry:
- * @link_name: link name for PCI route entry
- *
- * build AML package containing a PCI route entry for @link_name
- */
-static Aml *build_prt_entry(const char *link_name)
-{
-    Aml *a_zero = aml_int(0);
-    Aml *pkg = aml_package(4);
-    aml_append(pkg, a_zero);
-    aml_append(pkg, a_zero);
-    aml_append(pkg, aml_name("%s", link_name));
-    aml_append(pkg, a_zero);
-    return pkg;
-}
-
 /*
- * initialize_route - Initialize the interrupt routing rule
- * through a specific LINK:
- *  if (lnk_idx == idx)
- *      route using link 'link_name'
- */
-static Aml *initialize_route(Aml *route, const char *link_name,
-                             Aml *lnk_idx, int idx)
-{
-    Aml *if_ctx = aml_if(aml_equal(lnk_idx, aml_int(idx)));
-    Aml *pkg = build_prt_entry(link_name);
-
-    aml_append(if_ctx, aml_store(pkg, route));
-
-    return if_ctx;
-}
-
-/*
- * build_prt - Define interrupt rounting rules
+ * build_prt - Define interrupt routing rules
  *
  * Returns an array of 128 routes, one for each device,
  * based on device location.
  * The main goal is to equally distribute the interrupts
  * over the 4 existing ACPI links (works only for i440fx).
- * The hash function is  (slot + pin) & 3 -> "LNK[D|A|B|C]".
+ * The hash function is: (slot + pin) & 3 -> "LNK[D|A|B|C]".
  *
  */
 static Aml *build_prt(bool is_pci0_prt)
 {
-    Aml *method, *while_ctx, *pin, *res;
+    const int nroutes = 128;
+    Aml *rt_pkg, *method;
+    int pin;
 
     method = aml_method("_PRT", 0, AML_NOTSERIALIZED);
-    res = aml_local(0);
-    pin = aml_local(1);
-    aml_append(method, aml_store(aml_package(128), res));
-    aml_append(method, aml_store(aml_int(0), pin));
+    rt_pkg = aml_varpackage(nroutes);
 
-    /* while (pin < 128) */
-    while_ctx = aml_while(aml_lless(pin, aml_int(128)));
-    {
-        Aml *slot = aml_local(2);
-        Aml *lnk_idx = aml_local(3);
-        Aml *route = aml_local(4);
-
-        /* slot = pin >> 2 */
-        aml_append(while_ctx,
-                   aml_store(aml_shiftright(pin, aml_int(2), NULL), slot));
-        /* lnk_idx = (slot + pin) & 3 */
-        aml_append(while_ctx,
-            aml_store(aml_and(aml_add(pin, slot, NULL), aml_int(3), NULL),
-                      lnk_idx));
-
-        /* route[2] = "LNK[D|A|B|C]", selection based on pin % 3  */
-        aml_append(while_ctx, initialize_route(route, "LNKD", lnk_idx, 0));
-        if (is_pci0_prt) {
-            Aml *if_device_1, *if_pin_4, *else_pin_4;
-
-            /* device 1 is the power-management device, needs SCI */
-            if_device_1 = aml_if(aml_equal(lnk_idx, aml_int(1)));
-            {
-                if_pin_4 = aml_if(aml_equal(pin, aml_int(4)));
-                {
-                    aml_append(if_pin_4,
-                        aml_store(build_prt_entry("LNKS"), route));
-                }
-                aml_append(if_device_1, if_pin_4);
-                else_pin_4 = aml_else();
-                {
-                    aml_append(else_pin_4,
-                        aml_store(build_prt_entry("LNKA"), route));
-                }
-                aml_append(if_device_1, else_pin_4);
-            }
-            aml_append(while_ctx, if_device_1);
+    for (pin = 0; pin < nroutes; pin++) {
+        Aml *pkg = aml_package(4);
+        int slot = pin >> 2;
+
+        aml_append(pkg, aml_int((slot << 16) | 0xFFFF));
+        aml_append(pkg, aml_int(pin & 3));
+        /* device 1 is the power-management device, needs SCI */
+        if (is_pci0_prt && pin == 4) {
+            aml_append(pkg, aml_name("%s", "LNKS"));
         } else {
-            aml_append(while_ctx, initialize_route(route, "LNKA", lnk_idx, 1));
+            static const char link_name[][5] = {"LNKD", "LNKA", "LNKB", "LNKC"};
+            int hash = (slot + pin) & 3;
+            aml_append(pkg, aml_name("%s", link_name[hash]));
         }
-        aml_append(while_ctx, initialize_route(route, "LNKB", lnk_idx, 2));
-        aml_append(while_ctx, initialize_route(route, "LNKC", lnk_idx, 3));
-
-        /* route[0] = 0x[slot]FFFF */
-        aml_append(while_ctx,
-            aml_store(aml_or(aml_shiftleft(slot, aml_int(16)), aml_int(0xFFFF),
-                             NULL),
-                      aml_index(route, aml_int(0))));
-        /* route[1] = pin & 3 */
-        aml_append(while_ctx,
-            aml_store(aml_and(pin, aml_int(3), NULL),
-                      aml_index(route, aml_int(1))));
-        /* res[pin] = route */
-        aml_append(while_ctx, aml_store(route, aml_index(res, pin)));
-        /* pin++ */
-        aml_append(while_ctx, aml_increment(pin));
+        aml_append(pkg, aml_int(0));
+        aml_append(rt_pkg, pkg);
     }
-    aml_append(method, while_ctx);
-    /* return res*/
-    aml_append(method, aml_return(res));
+
+    aml_append(method, aml_return(rt_pkg));
 
     return method;
 }