[ISAPNP] Fix descriptors and support alternative configurations

- Fix empty resource descriptors being created.
- Properly support IRQ descriptors.
- Introduce four helpers made to help search descriptors
  in the logical device's requirements.
- Implement support for memory descriptors and alternative configurations.
- DMA descriptors are always DMA_8.

drivers/bus/isapnp/isapnp.h

@@ -279,6 +279,41 @@ HasMemory32Alternatives(
 
 /* isapnp.c */
 
+CODE_SEG("PAGE")
+BOOLEAN
+FindIoDescriptor(
+    _In_ PISAPNP_LOGICAL_DEVICE LogDevice,
+    _In_opt_ ULONG Base,
+    _In_ ULONG RangeStart,
+    _In_ ULONG RangeEnd,
+    _Out_opt_ PUCHAR Information,
+    _Out_opt_ PULONG Length,
+    _Out_opt_ PUCHAR WriteOrder);
+
+CODE_SEG("PAGE")
+BOOLEAN
+FindIrqDescriptor(
+    _In_ PISAPNP_LOGICAL_DEVICE LogDevice,
+    _In_ ULONG Vector,
+    _Out_opt_ PUCHAR WriteOrder);
+
+CODE_SEG("PAGE")
+BOOLEAN
+FindDmaDescriptor(
+    _In_ PISAPNP_LOGICAL_DEVICE LogDevice,
+    _In_ ULONG Channel,
+    _Out_opt_ PUCHAR WriteOrder);
+
+CODE_SEG("PAGE")
+BOOLEAN
+FindMemoryDescriptor(
+    _In_ PISAPNP_LOGICAL_DEVICE LogDevice,
+    _In_ ULONG RangeStart,
+    _In_ ULONG RangeEnd,
+    _Out_opt_ PBOOLEAN Memory32,
+    _Out_opt_ PUCHAR Information,
+    _Out_opt_ PUCHAR WriteOrder);
+
 CODE_SEG("PAGE")
 NTSTATUS
 IsaPnpCreateReadPortDORequirements(