[Qemu-devel] [PATCH v4 22/22] petalogix-ml605: Make the LMB visible only to the CPU

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 hw/microblaze/petalogix_ml605_mmu.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/hw/microblaze/petalogix_ml605_mmu.c b/hw/microblaze/petalogix_ml605_mmu.c
index 37cbbfd..d1acbff 100644
--- a/hw/microblaze/petalogix_ml605_mmu.c
+++ b/hw/microblaze/petalogix_ml605_mmu.c
@@ -86,16 +86,31 @@ petalogix_ml605_init(QEMUMachineInitArgs *args)
     MemoryRegion *phys_lmb_bram = g_new(MemoryRegion, 1);
     MemoryRegion *phys_ram = g_new(MemoryRegion, 1);
     qemu_irq irq[32];
+    MemoryRegion *sysmem_alias = g_new(MemoryRegion, 1);
+    MemoryRegion *mr_cpu_root = g_new(MemoryRegion, 1);
+    AddressSpace *as_cpu = g_malloc0(sizeof(*as_cpu));
+
+    /* Setup the CPU specific address-space.  */
+    memory_region_init(mr_cpu_root, NULL, "as-cpu-root", INT64_MAX);
+    address_space_init(as_cpu, mr_cpu_root, "as/cpu");
 
     /* init CPUs */
     cpu = MICROBLAZE_CPU(object_new(TYPE_MICROBLAZE_CPU));
+    qdev_prop_set_address_space(DEVICE(cpu), "address-space", as_cpu);
     object_property_set_bool(OBJECT(cpu), true, "realized", &error_abort);
 
+    /* Populate the CPU AS with the LMB only visible to the CPU.  */
+    memory_region_init_alias(sysmem_alias, NULL, "sysmem_alias",
+                             address_space_mem, 0,
+                             memory_region_size(address_space_mem));
+    memory_region_add_subregion(mr_cpu_root, 0x00000000, sysmem_alias);
+
     /* Attach emulated BRAM through the LMB.  */
     memory_region_init_ram(phys_lmb_bram, NULL, "petalogix_ml605.lmb_bram",
                            LMB_BRAM_SIZE);
     vmstate_register_ram_global(phys_lmb_bram);
-    memory_region_add_subregion(address_space_mem, 0x00000000, phys_lmb_bram);
+    memory_region_add_subregion_overlap(mr_cpu_root, 0x00000000,
+                                        phys_lmb_bram, 2);
 
     memory_region_init_ram(phys_ram, NULL, "petalogix_ml605.ram", ram_size);
     vmstate_register_ram_global(phys_ram);
-- 
1.8.1.2