[v4,1/2] Minimal RAM API support

diff --git a/Makefile.objs b/Makefile.objs
index cebb945..47f3c3a 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -172,6 +172,7 @@  hw-obj-y += pci.o pci_bridge.o msix.o msi.o
 hw-obj-$(CONFIG_PCI) += pci_host.o pcie_host.o
 hw-obj-$(CONFIG_PCI) += ioh3420.o xio3130_upstream.o xio3130_downstream.o
 hw-obj-y += watchdog.o
+hw-obj-y += memory.o
 hw-obj-$(CONFIG_ISA_MMIO) += isa_mmio.o
 hw-obj-$(CONFIG_ECC) += ecc.o
 hw-obj-$(CONFIG_NAND) += nand.o
diff --git a/cpu-common.h b/cpu-common.h
index 6d4a898..f08f93b 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -29,6 +29,8 @@  enum device_endian {
 /* address in the RAM (different from a physical address) */
 typedef unsigned long ram_addr_t;
 
+#include "memory.h"
+
 /* memory API */
 
 typedef void CPUWriteMemoryFunc(void *opaque, target_phys_addr_t addr, uint32_t value);
diff --git a/memory.c b/memory.c
new file mode 100644
index 0000000..07cb020
--- /dev/null
+++ b/memory.c
@@ -0,0 +1,94 @@ 
+/*
+ * RAM API
+ *
+ *  Copyright Red Hat, Inc. 2010
+ *
+ * Authors:
+ *  Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+#include "memory.h"
+#include "range.h"
+
+typedef struct RamSlot {
+    target_phys_addr_t start_addr;
+    ram_addr_t size;
+    ram_addr_t offset;
+    QLIST_ENTRY(RamSlot) next;
+} RamSlot;
+
+static QLIST_HEAD(ram_slot_list, RamSlot) ram_slot_list =
+    QLIST_HEAD_INITIALIZER(ram_slot_list);
+
+static RamSlot *ram_find_slot(target_phys_addr_t start_addr, ram_addr_t size)
+{
+    RamSlot *slot;
+
+    QLIST_FOREACH(slot, &ram_slot_list, next) {
+        if (slot->start_addr == start_addr && slot->size == size) {
+            return slot;
+        }
+
+        if (ranges_overlap(start_addr, size, slot->start_addr, slot->size)) {
+            hw_error("Ram range overlaps existing slot\n");
+        }
+    }
+
+    return NULL;
+}
+
+int ram_register(target_phys_addr_t start_addr, ram_addr_t size,
+                 ram_addr_t phys_offset)
+{
+    RamSlot *slot;
+
+    if (!size) {
+        return -EINVAL;
+    }
+
+    assert(!ram_find_slot(start_addr, size));
+
+    slot = qemu_malloc(sizeof(RamSlot));
+
+    slot->start_addr = start_addr;
+    slot->size = size;
+    slot->offset = phys_offset;
+
+    QLIST_INSERT_HEAD(&ram_slot_list, slot, next);
+
+    cpu_register_physical_memory(slot->start_addr, slot->size, slot->offset);
+
+    return 0;
+}
+
+void ram_unregister(target_phys_addr_t start_addr, ram_addr_t size)
+{
+    RamSlot *slot;
+
+    if (!size) {
+        return;
+    }
+
+    slot = ram_find_slot(start_addr, size);
+    assert(slot != NULL);
+
+    QLIST_REMOVE(slot, next);
+    qemu_free(slot);
+    cpu_register_physical_memory(start_addr, size, IO_MEM_UNASSIGNED);
+}
+
+int ram_for_each_slot(void *opaque, ram_for_each_slot_fn fn)
+{
+    RamSlot *slot;
+
+    QLIST_FOREACH(slot, &ram_slot_list, next) {
+        int ret = fn(opaque, slot->start_addr, slot->size, slot->offset);
+        if (ret) {
+            return ret;
+        }
+    }
+    return 0;
+}
diff --git a/memory.h b/memory.h
new file mode 100644
index 0000000..98c85ea
--- /dev/null
+++ b/memory.h
@@ -0,0 +1,44 @@ 
+#ifndef QEMU_MEMORY_H
+#define QEMU_MEMORY_H
+/*
+ * RAM API
+ *
+ *  Copyright Red Hat, Inc. 2010
+ *
+ * Authors:
+ *  Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu-common.h"
+#include "cpu-common.h"
+
+typedef int (*ram_for_each_slot_fn)(void *opaque,
+                                    target_phys_addr_t start_addr,
+                                    ram_addr_t size,
+                                    ram_addr_t phys_offset);
+
+/**
+ * ram_register() : Register a region of guest physical memory
+ *
+ * The new region must not overlap an existing region.
+ */
+int ram_register(target_phys_addr_t start_addr, ram_addr_t size,
+                 ram_addr_t phys_offset);
+
+/**
+ * ram_unregister() : Unregister a region of guest physical memory
+ */
+void ram_unregister(target_phys_addr_t start_addr, ram_addr_t size);
+
+/**
+ * ram_for_each_slot() : Call fn() on each registered region
+ *
+ * Stop on non-zero return from fn().
+ */
+int ram_for_each_slot(void *opaque, ram_for_each_slot_fn fn);
+
+#endif /* QEMU_MEMORY_H */