memory_region_allocate_system_memory() API is going away, so
replace it with memdev allocated MemoryRegion. The later is
initialized by generic code, so board only needs to opt in
to memdev scheme by providing
  MachineClass::default_ram_id
and using MachineState::ram instead of manually initializing
RAM memory region.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
CC: hpoussin@reactos.org
CC: david@gibson.dropbear.id.au
CC: qemu-ppc@nongnu.org
---
 hw/ppc/prep.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c
index 862345c..bf75dde 100644
--- a/hw/ppc/prep.c
+++ b/hw/ppc/prep.c
@@ -400,7 +400,6 @@ static int PPC_NVRAM_set_params (Nvram *nvram, uint16_t NVRAM_size,
 /* PowerPC PREP hardware initialisation */
 static void ppc_prep_init(MachineState *machine)
 {
-    ram_addr_t ram_size = machine->ram_size;
     const char *kernel_filename = machine->kernel_filename;
     const char *kernel_cmdline = machine->kernel_cmdline;
     const char *initrd_filename = machine->initrd_filename;
@@ -413,7 +412,6 @@ static void ppc_prep_init(MachineState *machine)
     MemoryRegion *xcsr = g_new(MemoryRegion, 1);
 #endif
     int linux_boot, i, nb_nics1;
-    MemoryRegion *ram = g_new(MemoryRegion, 1);
     uint32_t kernel_base, initrd_base;
     long kernel_size, initrd_size;
     DeviceState *dev;
@@ -444,15 +442,14 @@ static void ppc_prep_init(MachineState *machine)
         qemu_register_reset(ppc_prep_reset, cpu);
     }
 
-    /* allocate RAM */
-    memory_region_allocate_system_memory(ram, NULL, "ppc_prep.ram", ram_size);
-    memory_region_add_subregion(sysmem, 0, ram);
+    /* map RAM */
+    memory_region_add_subregion(sysmem, 0, machine->ram);
 
     if (linux_boot) {
         kernel_base = KERNEL_LOAD_ADDR;
         /* now we can load the kernel */
         kernel_size = load_image_targphys(kernel_filename, kernel_base,
-                                          ram_size - kernel_base);
+                                          machine->ram_size - kernel_base);
         if (kernel_size < 0) {
             error_report("could not load kernel '%s'", kernel_filename);
             exit(1);
@@ -461,7 +458,7 @@ static void ppc_prep_init(MachineState *machine)
         if (initrd_filename) {
             initrd_base = INITRD_LOAD_ADDR;
             initrd_size = load_image_targphys(initrd_filename, initrd_base,
-                                              ram_size - initrd_base);
+                                              machine->ram_size - initrd_base);
             if (initrd_size < 0) {
                 error_report("could not load initial ram disk '%s'",
                              initrd_filename);
@@ -576,7 +573,7 @@ static void ppc_prep_init(MachineState *machine)
     sysctrl->nvram = m48t59;
 
     /* Initialise NVRAM */
-    PPC_NVRAM_set_params(m48t59, NVRAM_SIZE, "PREP", ram_size,
+    PPC_NVRAM_set_params(m48t59, NVRAM_SIZE, "PREP", machine->ram_size,
                          ppc_boot_device,
                          kernel_base, kernel_size,
                          kernel_cmdline,
@@ -596,6 +593,7 @@ static void prep_machine_init(MachineClass *mc)
     mc->default_boot_order = "cad";
     mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("602");
     mc->default_display = "std";
+    mc->default_ram_id = "ppc_prep.ram";
 }
 
 static int prep_set_cmos_checksum(DeviceState *dev, void *opaque)
@@ -814,6 +812,7 @@ static void ibm_40p_machine_init(MachineClass *mc)
     mc->init = ibm_40p_init;
     mc->max_cpus = 1;
     mc->default_ram_size = 128 * MiB;
+    mc->default_ram_id = "ppc_prep.ram";
     mc->block_default_type = IF_SCSI;
     mc->default_boot_order = "c";
     mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("604");
-- 
2.7.4