hw/s390-virtio.c

   1 /*
   2  * QEMU S390 virtio target
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw.h"
  21 #include "block.h"
  22 #include "sysemu.h"
  23 #include "net.h"
  24 #include "boards.h"
  25 #include "monitor.h"
  26 #include "loader.h"
  27 #include "elf.h"
  28 #include "hw/virtio.h"
  29 #include "hw/sysbus.h"
  30 #include "kvm.h"
  31
  32 #include "hw/s390-virtio-bus.h"
  33
  34 //#define DEBUG_S390
  35
  36 #ifdef DEBUG_S390
  37 #define dprintf(fmt, ...) \
  38     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  39 #else
  40 #define dprintf(fmt, ...) \
  41     do { } while (0)
  42 #endif
  43
  44 #define KVM_S390_VIRTIO_NOTIFY          0
  45 #define KVM_S390_VIRTIO_RESET           1
  46 #define KVM_S390_VIRTIO_SET_STATUS      2
  47
  48 #define KERN_IMAGE_START                0x010000UL
  49 #define KERN_PARM_AREA                  0x010480UL
  50 #define INITRD_START                    0x800000UL
  51 #define INITRD_PARM_START               0x010408UL
  52 #define INITRD_PARM_SIZE                0x010410UL
  53 #define PARMFILE_START                  0x001000UL
  54
  55 #define ZIPL_START                      0x009000UL
  56 #define ZIPL_LOAD_ADDR                  0x009000UL
  57 #define ZIPL_FILENAME                   "s390-zipl.rom"
  58
  59 #define MAX_BLK_DEVS                    10
  60
  61 static VirtIOS390Bus *s390_bus;
  62 static CPUState **ipi_states;
  63
  64 void irq_info(Monitor *mon);
  65 void pic_info(Monitor *mon);
  66
  67 void irq_info(Monitor *mon)
  68 {
  69 }
  70
  71 void pic_info(Monitor *mon)
  72 {
  73 }
  74
  75 CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
  76 {
  77     if (cpu_addr >= smp_cpus) {
  78         return NULL;
  79     }
  80
  81     return ipi_states[cpu_addr];
  82 }
  83
  84 int s390_virtio_hypercall(CPUState *env)
  85 {
  86     int r = 0, i;
  87     target_ulong mem = env->regs[2];
  88
  89     dprintf("KVM hypercall: %ld\n", env->regs[1]);
  90     switch (env->regs[1]) {
  91     case KVM_S390_VIRTIO_NOTIFY:
  92         if (mem > ram_size) {
  93             VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
  94                                                                mem, &i);
  95             if (dev) {
  96                 virtio_queue_notify(dev->vdev, i);
  97             } else {
  98                 r = -EINVAL;
  99             }
 100         } else {
 101             /* Early printk */
 102         }
 103         break;
 104     case KVM_S390_VIRTIO_RESET:
 105     {
 106         VirtIOS390Device *dev;
 107
 108         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 109         virtio_reset(dev->vdev);
 110         s390_virtio_device_sync(dev);
 111         break;
 112     }
 113     case KVM_S390_VIRTIO_SET_STATUS:
 114     {
 115         VirtIOS390Device *dev;
 116
 117         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 118         if (dev) {
 119             s390_virtio_device_update_status(dev);
 120         } else {
 121             r = -EINVAL;
 122         }
 123         break;
 124     }
 125     default:
 126         r = -EINVAL;
 127         break;
 128     }
 129
 130     env->regs[2] = r;
 131     return 0;
 132 }
 133
 134 /* PC hardware initialisation */
 135 static void s390_init(ram_addr_t ram_size,
 136                       const char *boot_device,
 137                       const char *kernel_filename,
 138                       const char *kernel_cmdline,
 139                       const char *initrd_filename,
 140                       const char *cpu_model)
 141 {
 142     CPUState *env = NULL;
 143     ram_addr_t ram_addr;
 144     ram_addr_t kernel_size = 0;
 145     ram_addr_t initrd_offset;
 146     ram_addr_t initrd_size = 0;
 147     int i;
 148
 149     /* XXX we only work on KVM for now */
 150
 151     if (!kvm_enabled()) {
 152         fprintf(stderr, "The S390 target only works with KVM enabled\n");
 153         exit(1);
 154     }
 155
 156     /* get a BUS */
 157     s390_bus = s390_virtio_bus_init(&ram_size);
 158
 159     /* allocate RAM */
 160     ram_addr = qemu_ram_alloc(NULL, "s390.ram", ram_size);
 161     cpu_register_physical_memory(0, ram_size, ram_addr);
 162
 163     /* init CPUs */
 164     if (cpu_model == NULL) {
 165         cpu_model = "host";
 166     }
 167
 168     ipi_states = qemu_malloc(sizeof(CPUState *) * smp_cpus);
 169
 170     for (i = 0; i < smp_cpus; i++) {
 171         CPUState *tmp_env;
 172
 173         tmp_env = cpu_init(cpu_model);
 174         if (!env) {
 175             env = tmp_env;
 176         }
 177         ipi_states[i] = tmp_env;
 178         tmp_env->halted = 1;
 179         tmp_env->exception_index = EXCP_HLT;
 180     }
 181
 182     env->halted = 0;
 183     env->exception_index = 0;
 184
 185     if (kernel_filename) {
 186         kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
 187
 188         if (lduw_phys(KERN_IMAGE_START) != 0x0dd0) {
 189             fprintf(stderr, "Specified image is not an s390 boot image\n");
 190             exit(1);
 191         }
 192
 193         env->psw.addr = KERN_IMAGE_START;
 194         env->psw.mask = 0x0000000180000000ULL;
 195     } else {
 196         ram_addr_t bios_size = 0;
 197         char *bios_filename;
 198
 199         /* Load zipl bootloader */
 200         if (bios_name == NULL) {
 201             bios_name = ZIPL_FILENAME;
 202         }
 203
 204         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 205         bios_size = load_image(bios_filename, qemu_get_ram_ptr(ZIPL_LOAD_ADDR));
 206
 207         if ((long)bios_size < 0) {
 208             hw_error("could not load bootloader '%s'\n", bios_name);
 209         }
 210
 211         if (bios_size > 4096) {
 212             hw_error("stage1 bootloader is > 4k\n");
 213         }
 214
 215         env->psw.addr = ZIPL_START;
 216         env->psw.mask = 0x0000000180000000ULL;
 217     }
 218
 219     if (initrd_filename) {
 220         initrd_offset = INITRD_START;
 221         while (kernel_size + 0x100000 > initrd_offset) {
 222             initrd_offset += 0x100000;
 223         }
 224         initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
 225
 226         stq_phys(INITRD_PARM_START, initrd_offset);
 227         stq_phys(INITRD_PARM_SIZE, initrd_size);
 228     }
 229
 230     if (kernel_cmdline) {
 231         cpu_physical_memory_rw(KERN_PARM_AREA, (uint8_t *)kernel_cmdline,
 232                                strlen(kernel_cmdline), 1);
 233     }
 234
 235     /* Create VirtIO network adapters */
 236     for(i = 0; i < nb_nics; i++) {
 237         NICInfo *nd = &nd_table[i];
 238         DeviceState *dev;
 239
 240         if (!nd->model) {
 241             nd->model = qemu_strdup("virtio");
 242         }
 243
 244         if (strcmp(nd->model, "virtio")) {
 245             fprintf(stderr, "S390 only supports VirtIO nics\n");
 246             exit(1);
 247         }
 248
 249         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 250         qdev_set_nic_properties(dev, nd);
 251         qdev_init_nofail(dev);
 252     }
 253
 254     /* Create VirtIO disk drives */
 255     for(i = 0; i < MAX_BLK_DEVS; i++) {
 256         DriveInfo *dinfo;
 257         DeviceState *dev;
 258
 259         dinfo = drive_get(IF_IDE, 0, i);
 260         if (!dinfo) {
 261             continue;
 262         }
 263
 264         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
 265         qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);
 266         qdev_init_nofail(dev);
 267     }
 268 }
 269
 270 static QEMUMachine s390_machine = {
 271     .name = "s390-virtio",
 272     .alias = "s390",
 273     .desc = "VirtIO based S390 machine",
 274     .init = s390_init,
 275     .no_serial = 1,
 276     .no_parallel = 1,
 277     .use_virtcon = 1,
 278     .no_vga = 1,
 279     .max_cpus = 255,
 280     .is_default = 1,
 281 };
 282
 283 static void s390_machine_init(void)
 284 {
 285     qemu_register_machine(&s390_machine);
 286 }
 287
 288 machine_init(s390_machine_init);