[Qemu-devel] [PATCH 19/20] [MIPS] qdev: add a mips board device, which initializes the ram and the rom

["Hervé Poussineau" <hpoussin@reactos.org>]

Also add an empty machine (to be used with the mips board device)
Finally, add a workaround to be able to create the initial system bus

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
---
 hw/mips_jazz.c |   78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/qdev.c      |    6 ++++
 2 files changed, 84 insertions(+), 0 deletions(-)

diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
index 6daf76e..b4c95c9 100644
--- a/hw/mips_jazz.c
+++ b/hw/mips_jazz.c
@@ -37,6 +37,7 @@
 #include "loader.h"
 #include "mc146818rtc.h"
 #include "rc4030.h"
+#include "sysbus.h"
 
 enum jazz_model_e
 {
@@ -274,6 +275,14 @@ void mips_pica61_init (ram_addr_t ram_size,
     mips_jazz_init(ram_size, cpu_model, JAZZ_PICA61);
 }
 
+static
+void empty_init (ram_addr_t ram_size,
+                 const char *boot_device,
+                 const char *kernel_filename, const char *kernel_cmdline,
+                 const char *initrd_filename, const char *cpu_model)
+{
+}
+
 static QEMUMachine mips_magnum_machine = {
     .name = "magnum",
     .desc = "MIPS Magnum",
@@ -288,10 +297,79 @@ static QEMUMachine mips_pica61_machine = {
     .use_scsi = 1,
 };
 
+static QEMUMachine empty_machine = {
+    .name = "empty",
+    .desc = "Empty machine",
+    .init = empty_init,
+};
+
 static void mips_jazz_machine_init(void)
 {
     qemu_register_machine(&mips_magnum_machine);
     qemu_register_machine(&mips_pica61_machine);
+    qemu_register_machine(&empty_machine);
 }
 
 machine_init(mips_jazz_machine_init);
+
+typedef struct MipsBoardState {
+    SysBusDevice busdev;
+
+    char *romfile;
+    uint32_t romsize;
+    uint32_t ramsize;
+} MipsBoardState;
+
+static int mips_board_device_init(SysBusDevice *dev)
+{
+    MipsBoardState *s = FROM_SYSBUS(MipsBoardState, dev);
+    int bios_size;
+    ram_addr_t ram_size;
+    ram_addr_t ram_offset;
+    ram_addr_t bios_offset;
+
+    /* allocate RAM */
+    ram_size = s->ramsize * 1024 * 1024;
+    ram_offset = qemu_ram_alloc(NULL, "mips_jazz.ram", ram_size);
+    cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
+
+    /* load the BIOS image */
+    if (s->romfile) {
+        bios_offset = qemu_ram_alloc(NULL, "mips_jazz.bios", s->romsize);
+        cpu_register_physical_memory(0x1fc00000LL,
+                                     s->romsize, bios_offset | IO_MEM_ROM);
+        cpu_register_physical_memory(0xfff00000LL,
+                                     s->romsize, bios_offset | IO_MEM_ROM);
+
+        bios_size = load_image_targphys(s->romfile,
+                                        0x1fc00000LL,
+                                        s->romsize);
+
+        bios_size = load_image_targphys(s->romfile,
+                                        0xfff00000LL,
+                                        s->romsize);
+        if (bios_size != s->romsize) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
+static SysBusDeviceInfo board_device_info = {
+    .qdev.name = "mips-board",
+    .qdev.size = sizeof(MipsBoardState),
+    .init      = mips_board_device_init,
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_STRING("romfile", MipsBoardState, romfile),
+        DEFINE_PROP_HEX32("romsize", MipsBoardState, romsize, 0x40000),
+        DEFINE_PROP_UINT32("ramsize", MipsBoardState, ramsize, 64),
+        DEFINE_PROP_END_OF_LIST(),
+    },
+};
+
+static void mips_register_devices(void)
+{
+    sysbus_register_withprop(&board_device_info);
+}
+
+device_init(mips_register_devices)
diff --git a/hw/qdev.c b/hw/qdev.c
index e99c73f..f907385 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -455,6 +455,12 @@ static BusState *qbus_find_recursive(BusState *bus, const char *name,
     BusState *child, *ret;
     int match = 1;
 
+    if (!bus) {
+        if (!main_system_bus) {
+            main_system_bus = qbus_create(&system_bus_info, NULL, "main-system-bus");
+        }
+        return main_system_bus;
+    }
     if (name && (strcmp(bus->name, name) != 0)) {
         match = 0;
     }
-- 
1.7.1.GIT