[PULL 40/73] pcihp: move PCI _DSM function 0 prolog into separate function

["Michael S. Tsirkin" <mst@redhat.com>]

From: Igor Mammedov <imammedo@redhat.com>

it will be reused by follow up patches that will implement
static _DSM for non-hotpluggable devices.

no functional AML change, only context one, where 'cap' (Local1)
initialization is moved after UUID/revision checks.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230302161543.286002-15-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/i386/acpi-build.c | 54 ++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 24 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index c691104d47..d8ec91b8e3 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -373,6 +373,33 @@ Aml *aml_pci_device_dsm(void)
     return method;
 }
 
+static void build_append_pci_dsm_func0_common(Aml *ctx, Aml *retvar)
+{
+    Aml *UUID, *ifctx1;
+    uint8_t byte_list[1] = { 0 }; /* nothing supported yet */
+
+    aml_append(ctx, aml_store(aml_buffer(1, byte_list), retvar));
+    /*
+     * PCI Firmware Specification 3.1
+     * 4.6.  _DSM Definitions for PCI
+     */
+    UUID = aml_touuid("E5C937D0-3553-4D7A-9117-EA4D19C3434D");
+    ifctx1 = aml_if(aml_lnot(aml_equal(aml_arg(0), UUID)));
+    {
+        /* call is for unsupported UUID, bail out */
+        aml_append(ifctx1, aml_return(retvar));
+    }
+    aml_append(ctx, ifctx1);
+
+    ifctx1 = aml_if(aml_lless(aml_arg(1), aml_int(2)));
+    {
+        /* call is for unsupported REV, bail out */
+        aml_append(ifctx1, aml_return(retvar));
+    }
+    aml_append(ctx, ifctx1);
+}
+
+
 static void build_append_pcihp_notify_entry(Aml *method, int slot)
 {
     Aml *if_ctx;
@@ -570,14 +597,13 @@ static bool build_append_notfication_callback(Aml *parent_scope,
 
 static Aml *aml_pci_pdsm(void)
 {
-    Aml *method, *UUID, *ifctx, *ifctx1;
+    Aml *method, *ifctx, *ifctx1;
     Aml *ret = aml_local(0);
     Aml *caps = aml_local(1);
     Aml *acpi_index = aml_local(2);
     Aml *zero = aml_int(0);
     Aml *one = aml_int(1);
     Aml *func = aml_arg(2);
-    Aml *rev = aml_arg(1);
     Aml *params = aml_arg(4);
     Aml *bnum = aml_derefof(aml_index(params, aml_int(0)));
     Aml *sunum = aml_derefof(aml_index(params, aml_int(1)));
@@ -587,29 +613,9 @@ static Aml *aml_pci_pdsm(void)
     /* get supported functions */
     ifctx = aml_if(aml_equal(func, zero));
     {
-        uint8_t byte_list[1] = { 0 }; /* nothing supported yet */
-        aml_append(ifctx, aml_store(aml_buffer(1, byte_list), ret));
+        build_append_pci_dsm_func0_common(ifctx, ret);
+
         aml_append(ifctx, aml_store(zero, caps));
-
-       /*
-        * PCI Firmware Specification 3.1
-        * 4.6.  _DSM Definitions for PCI
-        */
-        UUID = aml_touuid("E5C937D0-3553-4D7A-9117-EA4D19C3434D");
-        ifctx1 = aml_if(aml_lnot(aml_equal(aml_arg(0), UUID)));
-        {
-            /* call is for unsupported UUID, bail out */
-            aml_append(ifctx1, aml_return(ret));
-        }
-        aml_append(ifctx, ifctx1);
-
-        ifctx1 = aml_if(aml_lless(rev, aml_int(2)));
-        {
-            /* call is for unsupported REV, bail out */
-            aml_append(ifctx1, aml_return(ret));
-        }
-        aml_append(ifctx, ifctx1);
-
         aml_append(ifctx,
             aml_store(aml_call2("AIDX", bnum, sunum), acpi_index));
         /*
-- 
MST