[Qemu-devel] [PATCH 4/4] prep: add IBM RS/6000 7020 (40p) machine emulation

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

Machine is very simple (only one PCI host bridge and an ISA bridge).
Provide a ibm_40p.cfg file to add more devices to this machine.

Syntax is:
qemu-system-ppc -M 40p -readconfig ibm_40p.cfg

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
---
 default-configs/ppc-softmmu.mak |  2 +
 docs/ibm_40p.cfg                | 42 +++++++++++++++++
 hw/ppc/prep.c                   | 99 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 143 insertions(+)
 create mode 100644 docs/ibm_40p.cfg

diff --git a/default-configs/ppc-softmmu.mak b/default-configs/ppc-softmmu.mak
index 070803c..260dfb9 100644
--- a/default-configs/ppc-softmmu.mak
+++ b/default-configs/ppc-softmmu.mak
@@ -19,6 +19,7 @@ CONFIG_I82378=y
 CONFIG_PC87312=y
 CONFIG_MACIO=y
 CONFIG_PCSPK=y
+CONFIG_CS4231A=y
 CONFIG_CUDA=y
 CONFIG_ADB=y
 CONFIG_MAC_NVRAM=y
@@ -46,6 +47,7 @@ CONFIG_PLATFORM_BUS=y
 CONFIG_ETSEC=y
 CONFIG_LIBDECNUMBER=y
 # For PReP
+CONFIG_VGA_S3=y
 CONFIG_MC146818RTC=y
 CONFIG_RS6000_DEBUG=y
 CONFIG_RS6000_MC=y
diff --git a/docs/ibm_40p.cfg b/docs/ibm_40p.cfg
new file mode 100644
index 0000000..a7e21b5
--- /dev/null
+++ b/docs/ibm_40p.cfg
@@ -0,0 +1,42 @@
+############################################################################
+#
+# qemu-system-ppc -M 40 creates a bare machine with just the very essential
+# chipset devices being present:
+#
+#     00.0 - Host bridge
+#     0b.0 - ISA bridge
+#
+# This config file documents the other devices and how they are
+# created.  You can simply use "-readconfig $thisfile" to create
+# them all.
+[device]
+  driver = "i8042"
+
+[device]
+  driver = "cs4231a"
+  iobase = "0x830"
+  irq = "10"
+
+[device]
+  driver = "pc87312"
+  config = "12"
+
+[device]
+  driver = "lsi53c810"
+  addr = "01.0"
+
+[device]
+  driver = "pcnet"
+  addr = "03.0"
+
+[device]
+  driver = "isa-m48t59"
+  iobase = "0x74"
+
+[device]
+  driver = "prep-systemio"
+  ibm-planar-id = "0xfc"
+  equipment = "0xc0"
+
+[device]
+  driver = "rs6000-debug"
diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c
index 998ee2d..d051fba 100644
--- a/hw/ppc/prep.c
+++ b/hw/ppc/prep.c
@@ -699,6 +699,97 @@ static void ppc_prep_init(MachineState *machine)
                          graphic_width, graphic_height, graphic_depth);
 }
 
+static int prep_set_cmos_checksum(DeviceState *dev, void *opaque)
+{
+    uint16_t checksum = *(uint16_t *)opaque;
+    ISADevice *rtc;
+
+    rtc = ISA_DEVICE(object_dynamic_cast(OBJECT(dev), "mc146818rtc"));
+    if (rtc) {
+        rtc_set_memory(rtc, 0x2e, checksum & 0xff);
+        rtc_set_memory(rtc, 0x3e, checksum & 0xff);
+        rtc_set_memory(rtc, 0x2f, checksum >> 8);
+        rtc_set_memory(rtc, 0x3f, checksum >> 8);
+    }
+    return 0;
+}
+
+static void ibm_40p_init(MachineState *machine)
+{
+    CPUPPCState *env = NULL;
+    uint16_t cmos_checksum;
+    PowerPCCPU *cpu;
+    DeviceState *dev;
+    SysBusDevice *pcihost;
+    PCIBus *pci_bus;
+    BusState *isa_bus;
+
+    /* init CPU */
+    if (!machine->cpu_model) {
+        machine->cpu_model = "604";
+    }
+    cpu = cpu_ppc_init(machine->cpu_model);
+    if (cpu == NULL) {
+        fprintf(stderr, "Unable to find PowerPC CPU definition\n");
+        exit(1);
+    }
+    env = &cpu->env;
+
+    if (env->flags & POWERPC_FLAG_RTC_CLK) {
+        /* POWER / PowerPC 601 RTC clock frequency is 7.8125 MHz */
+        cpu_ppc_tb_init(env, 7812500UL);
+    } else {
+        /* Set time-base frequency to 100 Mhz */
+        cpu_ppc_tb_init(env, 100UL * 1000UL * 1000UL);
+    }
+    qemu_register_reset(ppc_prep_reset, cpu);
+    if (PPC_INPUT(env) != PPC_FLAGS_INPUT_6xx) {
+        hw_error("Only 6xx bus is supported on PREP machine\n");
+    }
+
+    /* PCI host */
+    dev = qdev_create(NULL, "raven-pcihost");
+    if (bios_name == NULL) {
+        bios_name = "P12H0456.IMG";
+    }
+    qdev_prop_set_string(dev, "bios-name", bios_name);
+    qdev_prop_set_uint32(dev, "elf-machine", ELF_MACHINE);
+    pcihost = SYS_BUS_DEVICE(dev);
+    object_property_add_child(qdev_get_machine(), "raven", OBJECT(dev), NULL);
+    qdev_init_nofail(dev);
+    pci_bus = PCI_BUS(qdev_get_child_bus(dev, "pci.0"));
+    if (pci_bus == NULL) {
+        fprintf(stderr, "Couldn't create PCI host controller.\n");
+        exit(1);
+    }
+
+    /* PCI -> ISA bridge */
+    dev = DEVICE(pci_create_simple(pci_bus, PCI_DEVFN(11, 0), "i82378"));
+    cpu = POWERPC_CPU(first_cpu);
+    qdev_connect_gpio_out(dev, 0,
+                          cpu->env.irq_inputs[PPC6xx_INPUT_INT]);
+    qdev_connect_gpio_out(dev, 1,
+                          qemu_allocate_irq(cpu_request_exit, NULL, 0));
+    sysbus_connect_irq(pcihost, 0, qdev_get_gpio_in(dev, 15));
+    sysbus_connect_irq(pcihost, 1, qdev_get_gpio_in(dev, 13));
+    sysbus_connect_irq(pcihost, 2, qdev_get_gpio_in(dev, 15));
+    sysbus_connect_irq(pcihost, 3, qdev_get_gpio_in(dev, 13));
+    isa_bus = qdev_get_child_bus(dev, "isa.0");
+
+    /* Memory controller */
+    dev = DEVICE(isa_create(ISA_BUS(isa_bus), "rs6000-mc"));
+    qdev_prop_set_uint32(dev, "ram-size", machine->ram_size);
+    qdev_init_nofail(dev);
+
+    /* initialize CMOS checksums */
+    cmos_checksum = 0x6aa9;
+    qbus_walk_children(isa_bus, prep_set_cmos_checksum, NULL, NULL, NULL,
+                       &cmos_checksum);
+
+    /* initialize audio subsystem */
+    audio_init();
+}
+
 static QEMUMachine prep_machine = {
     .name = "prep",
     .desc = "PowerPC PREP platform",
@@ -707,9 +798,17 @@ static QEMUMachine prep_machine = {
     .default_boot_order = "cad",
 };
 
+static QEMUMachine ibm_40p_machine = {
+    .name = "40p",
+    .desc = "IBM RS/6000 7020 (40p)",
+    .init = ibm_40p_init,
+    .max_cpus = 1,
+};
+
 static void prep_machine_init(void)
 {
     qemu_register_machine(&prep_machine);
+    qemu_register_machine(&ibm_40p_machine);
 }
 
 machine_init(prep_machine_init);
-- 
2.1.4