target-ppc: IBM PowerPC 440EP Bamboo reference board emulation

Since most IO devices are integrated into the 440EP chip, "Bamboo support"
mostly entails implementing the -kernel, -initrd, and -append options.

These options are implemented by loading the guest as if u-boot had done it,
i.e. loading a flat device tree, updating it to hold initrd addresses, ram
size, and command line, and passing the FDT address in r3.

Since we use it with KVM, we enable the virtio block driver and include hooks
necessary for KVM support.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6067 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 190 insertions, 0 deletions

diff --git a/hw/ppc440_bamboo.c b/hw/ppc440_bamboo.c
new file mode 100644
index 0000000..a6fc758
--- /dev/null
+++ b/hw/ppc440_bamboo.c
@@ -0,0 +1,190 @@
+/*
+ * Qemu PowerPC 440 Bamboo board emulation
+ *
+ * Copyright 2007 IBM Corporation.
+ * Authors:
+ * 	Jerone Young <jyoung5@us.ibm.com>
+ * 	Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
+ * 	Hollis Blanchard <hollisb@us.ibm.com>
+ *
+ * This work is licensed under the GNU GPL license version 2 or later.
+ *
+ */
+
+#include "config.h"
+#include "qemu-common.h"
+#include "net.h"
+#include "hw.h"
+#include "pci.h"
+#include "virtio-blk.h"
+#include "boards.h"
+#include "sysemu.h"
+#include "ppc440.h"
+#include "kvm.h"
+#include "kvm_ppc.h"
+#include "device_tree.h"
+
+#define BINARY_DEVICE_TREE_FILE "bamboo.dtb"
+
+static void *bamboo_load_device_tree(void *addr,
+                                     uint32_t ramsize,
+                                     target_phys_addr_t initrd_base,
+                                     target_phys_addr_t initrd_size,
+                                     const char *kernel_cmdline)
+{
+    void *fdt = NULL;
+#ifdef HAVE_FDT
+    uint32_t mem_reg_property[] = { 0, 0, ramsize };
+    char *path;
+    int pathlen;
+    int ret;
+
+    pathlen = snprintf(NULL, 0, "%s/%s", bios_dir, BINARY_DEVICE_TREE_FILE) + 1;
+    path = qemu_malloc(pathlen);
+    if (path == NULL)
+        return NULL;
+
+    snprintf(path, pathlen, "%s/%s", bios_dir, BINARY_DEVICE_TREE_FILE);
+
+    fdt = load_device_tree(path, addr);
+    free(path);
+    if (fdt == NULL)
+        goto out;
+
+    /* Manipulate device tree in memory. */
+
+    ret = qemu_devtree_setprop(fdt, "/memory", "reg", mem_reg_property,
+                               sizeof(mem_reg_property));
+    if (ret < 0)
+        fprintf(stderr, "couldn't set /memory/reg\n");
+
+    ret = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-start",
+                                    initrd_base);
+    if (ret < 0)
+        fprintf(stderr, "couldn't set /chosen/linux,initrd-start\n");
+
+    ret = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-end",
+                                    (initrd_base + initrd_size));
+    if (ret < 0)
+        fprintf(stderr, "couldn't set /chosen/linux,initrd-end\n");
+
+    ret = qemu_devtree_setprop_string(fdt, "/chosen", "bootargs",
+                                      kernel_cmdline);
+    if (ret < 0)
+        fprintf(stderr, "couldn't set /chosen/bootargs\n");
+
+    if (kvm_enabled())
+        kvmppc_fdt_update(fdt);
+
+out:
+#endif
+
+    return fdt;
+}
+
+static void bamboo_init(ram_addr_t ram_size, int vga_ram_size,
+                        const char *boot_device, DisplayState *ds,
+                        const char *kernel_filename,
+                        const char *kernel_cmdline,
+                        const char *initrd_filename,
+                        const char *cpu_model)
+{
+    unsigned int pci_irq_nrs[4] = { 28, 27, 26, 25 };
+    NICInfo *nd;
+    PCIBus *pcibus;
+    CPUState *env;
+    uint64_t elf_entry;
+    uint64_t elf_lowaddr;
+    target_ulong entry = 0;
+    target_ulong loadaddr = 0;
+    target_long kernel_size = 0;
+    target_ulong initrd_base = 0;
+    target_long initrd_size = 0;
+    target_ulong dt_base = 0;
+    void *fdt;
+    int i;
+
+    /* Setup CPU. */
+    env = ppc440ep_init(&ram_size, &pcibus, pci_irq_nrs, 1);
+
+    if (pcibus) {
+        int unit_id = 0;
+
+        /* Add virtio block devices. */
+        while ((i = drive_get_index(IF_VIRTIO, 0, unit_id)) != -1) {
+            virtio_blk_init(pcibus, drives_table[i].bdrv);
+            unit_id++;
+        }
+
+        /* Register network interfaces. */
+        for (i = 0; i < nb_nics; i++) {
+            nd = &nd_table[i];
+            if (!nd->model) {
+                /* There are no PCI NICs on the Bamboo board, but there are
+                 * PCI slots, so we can pick model whatever we want. */
+                nd->model = "e1000";
+            }
+            pci_nic_init(pcibus, nd, -1);
+        }
+    }
+
+    /* Load kernel. */
+    if (kernel_filename) {
+        kernel_size = load_uimage(kernel_filename, &entry, &loadaddr, NULL);
+        if (kernel_size < 0) {
+            kernel_size = load_elf(kernel_filename, 0, &elf_entry, &elf_lowaddr,
+                                   NULL);
+            entry = elf_entry;
+            loadaddr = elf_lowaddr;
+        }
+        /* XXX try again as binary */
+        if (kernel_size < 0) {
+            fprintf(stderr, "qemu: could not load kernel '%s'\n",
+                    kernel_filename);
+            exit(1);
+        }
+    }
+
+    /* Load initrd. */
+    if (initrd_filename) {
+        initrd_base = kernel_size + loadaddr;
+        initrd_size = load_image(initrd_filename, phys_ram_base + initrd_base);
+
+        if (initrd_size < 0) {
+            fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
+                    initrd_filename);
+            exit(1);
+        }
+    }
+
+    /* If we're loading a kernel directly, we must load the device tree too. */
+    if (kernel_filename) {
+        if (initrd_base)
+            dt_base = initrd_base + initrd_size;
+        else
+            dt_base = kernel_size + loadaddr;
+
+        fdt = bamboo_load_device_tree(phys_ram_base + dt_base, ram_size,
+                                      initrd_base, initrd_size, kernel_cmdline);
+        if (fdt == NULL) {
+            fprintf(stderr, "couldn't load device tree\n");
+            exit(1);
+        }
+
+        /* Set initial guest state. */
+        env->gpr[1] = (16<<20) - 8;
+        env->gpr[3] = dt_base;
+        env->nip = entry;
+        /* XXX we currently depend on KVM to create some initial TLB entries. */
+    }
+
+    if (kvm_enabled())
+        kvmppc_init();
+}
+
+QEMUMachine bamboo_machine = {
+    .name = "bamboo",
+    .desc = "bamboo",
+    .init = bamboo_init,
+    .ram_require = 8<<20 | RAMSIZE_FIXED,
+};