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1.1 root 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/virtio-console.h"
30: #include "hw/sysbus.h"
31: #include "kvm.h"
32:
33: #include "hw/s390-virtio-bus.h"
34:
35: //#define DEBUG_S390
36:
37: #ifdef DEBUG_S390
38: #define dprintf(fmt, ...) \
39: do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
40: #else
41: #define dprintf(fmt, ...) \
42: do { } while (0)
43: #endif
44:
45: #define KVM_S390_VIRTIO_NOTIFY 0
46: #define KVM_S390_VIRTIO_RESET 1
47: #define KVM_S390_VIRTIO_SET_STATUS 2
48:
49: #define KERN_IMAGE_START 0x010000UL
50: #define KERN_PARM_AREA 0x010480UL
51: #define INITRD_START 0x800000UL
52: #define INITRD_PARM_START 0x010408UL
53: #define INITRD_PARM_SIZE 0x010410UL
54: #define PARMFILE_START 0x001000UL
55:
56: #define MAX_BLK_DEVS 10
57:
58: static VirtIOS390Bus *s390_bus;
59: static CPUState **ipi_states;
60:
61: void irq_info(Monitor *mon);
62: void pic_info(Monitor *mon);
63:
64: void irq_info(Monitor *mon)
65: {
66: }
67:
68: void pic_info(Monitor *mon)
69: {
70: }
71:
72: CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
73: {
74: if (cpu_addr >= smp_cpus) {
75: return NULL;
76: }
77:
78: return ipi_states[cpu_addr];
79: }
80:
81: int s390_virtio_hypercall(CPUState *env)
82: {
83: int r = 0, i;
84: target_ulong mem = env->regs[2];
85:
86: dprintf("KVM hypercall: %ld\n", env->regs[1]);
87: switch (env->regs[1]) {
88: case KVM_S390_VIRTIO_NOTIFY:
89: if (mem > ram_size) {
90: VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
91: mem, &i);
92: if (dev) {
93: virtio_queue_notify(dev->vdev, i);
94: } else {
95: r = -EINVAL;
96: }
97: } else {
98: /* Early printk */
99: }
100: break;
101: case KVM_S390_VIRTIO_RESET:
102: {
103: /* Virtio_reset resets the internal addresses, so we'd have to sync
104: them up again. We don't want to reallocate a vring though, so let's
105: just not reset. */
106: /* virtio_reset(dev->vdev); */
107: break;
108: }
109: case KVM_S390_VIRTIO_SET_STATUS:
110: {
111: VirtIOS390Device *dev;
112:
113: dev = s390_virtio_bus_find_mem(s390_bus, mem);
114: if (dev) {
115: s390_virtio_device_update_status(dev);
116: } else {
117: r = -EINVAL;
118: }
119: break;
120: }
121: default:
122: r = -EINVAL;
123: break;
124: }
125:
126: env->regs[2] = r;
127: return 0;
128: }
129:
130: /* PC hardware initialisation */
131: static void s390_init(ram_addr_t ram_size,
132: const char *boot_device,
133: const char *kernel_filename,
134: const char *kernel_cmdline,
135: const char *initrd_filename,
136: const char *cpu_model)
137: {
138: CPUState *env = NULL;
139: ram_addr_t ram_addr;
140: ram_addr_t kernel_size = 0;
141: ram_addr_t initrd_offset;
142: ram_addr_t initrd_size = 0;
143: int i;
144:
145: /* XXX we only work on KVM for now */
146:
147: if (!kvm_enabled()) {
148: fprintf(stderr, "The S390 target only works with KVM enabled\n");
149: exit(1);
150: }
151:
152: /* get a BUS */
153: s390_bus = s390_virtio_bus_init(&ram_size);
154:
155: /* allocate RAM */
156: ram_addr = qemu_ram_alloc(ram_size);
157: cpu_register_physical_memory(0, ram_size, ram_addr);
158:
159: /* init CPUs */
160: if (cpu_model == NULL) {
161: cpu_model = "host";
162: }
163:
164: ipi_states = qemu_malloc(sizeof(CPUState *) * smp_cpus);
165:
166: for (i = 0; i < smp_cpus; i++) {
167: CPUState *tmp_env;
168:
169: tmp_env = cpu_init(cpu_model);
170: if (!env) {
171: env = tmp_env;
172: }
173: ipi_states[i] = tmp_env;
174: tmp_env->halted = 1;
175: tmp_env->exception_index = EXCP_HLT;
176: }
177:
178: env->halted = 0;
179: env->exception_index = 0;
180:
181: if (kernel_filename) {
182: kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
183:
184: if (lduw_phys(KERN_IMAGE_START) != 0x0dd0) {
185: fprintf(stderr, "Specified image is not an s390 boot image\n");
186: exit(1);
187: }
188:
189: cpu_synchronize_state(env);
190: env->psw.addr = KERN_IMAGE_START;
191: env->psw.mask = 0x0000000180000000ULL;
192: }
193:
194: if (initrd_filename) {
195: initrd_offset = INITRD_START;
196: while (kernel_size + 0x100000 > initrd_offset) {
197: initrd_offset += 0x100000;
198: }
199: initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
200:
201: stq_phys(INITRD_PARM_START, initrd_offset);
202: stq_phys(INITRD_PARM_SIZE, initrd_size);
203: }
204:
205: if (kernel_cmdline) {
206: cpu_physical_memory_rw(KERN_PARM_AREA, (uint8_t *)kernel_cmdline,
207: strlen(kernel_cmdline), 1);
208: }
209:
210: /* Create VirtIO console */
211: for(i = 0; i < MAX_VIRTIO_CONSOLES; i++) {
212: if (virtcon_hds[i]) {
213: qdev_init_nofail(qdev_create((BusState *)s390_bus, "virtio-console-s390"));
214: }
215: }
216:
217: /* Create VirtIO network adapters */
218: for(i = 0; i < nb_nics; i++) {
219: NICInfo *nd = &nd_table[i];
220: DeviceState *dev;
221:
222: if (!nd->model) {
223: nd->model = qemu_strdup("virtio");
224: }
225:
226: if (strcmp(nd->model, "virtio")) {
227: fprintf(stderr, "S390 only supports VirtIO nics\n");
228: exit(1);
229: }
230:
231: dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
232: qdev_set_nic_properties(dev, nd);
233: qdev_init_nofail(dev);
234: }
235:
236: /* Create VirtIO disk drives */
237: for(i = 0; i < MAX_BLK_DEVS; i++) {
238: DriveInfo *dinfo;
239: DeviceState *dev;
240:
241: dinfo = drive_get(IF_IDE, 0, i);
242: if (!dinfo) {
243: continue;
244: }
245:
246: dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
247: qdev_prop_set_drive(dev, "drive", dinfo);
248: qdev_init_nofail(dev);
249: }
250: }
251:
252: static QEMUMachine s390_machine = {
253: .name = "s390-virtio",
254: .alias = "s390",
255: .desc = "VirtIO based S390 machine",
256: .init = s390_init,
257: .no_serial = 1,
258: .no_parallel = 1,
259: .use_virtcon = 1,
260: .no_vga = 1,
261: .max_cpus = 255,
262: .is_default = 1,
263: };
264:
265: static void s390_machine_init(void)
266: {
267: qemu_register_machine(&s390_machine);
268: }
269:
270: machine_init(s390_machine_init);