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1 | /* | |
2 | * bootloader support | |
3 | * | |
4 | * Copyright IBM, Corp. 2012 | |
5 | * | |
6 | * Authors: | |
7 | * Christian Borntraeger <borntraeger@de.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or (at your | |
10 | * option) any later version. See the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include "qemu/osdep.h" | |
15 | #include "qapi/error.h" | |
16 | #include "sysemu/sysemu.h" | |
17 | #include "cpu.h" | |
18 | #include "elf.h" | |
19 | #include "hw/loader.h" | |
20 | #include "hw/s390x/virtio-ccw.h" | |
21 | #include "hw/s390x/css.h" | |
22 | #include "ipl.h" | |
23 | #include "qemu/error-report.h" | |
24 | ||
25 | #define KERN_IMAGE_START 0x010000UL | |
26 | #define KERN_PARM_AREA 0x010480UL | |
27 | #define INITRD_START 0x800000UL | |
28 | #define INITRD_PARM_START 0x010408UL | |
29 | #define INITRD_PARM_SIZE 0x010410UL | |
30 | #define PARMFILE_START 0x001000UL | |
31 | #define ZIPL_IMAGE_START 0x009000UL | |
32 | #define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64) | |
33 | ||
34 | static bool iplb_extended_needed(void *opaque) | |
35 | { | |
36 | S390IPLState *ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL)); | |
37 | ||
38 | return ipl->iplbext_migration; | |
39 | } | |
40 | ||
41 | static const VMStateDescription vmstate_iplb_extended = { | |
42 | .name = "ipl/iplb_extended", | |
43 | .version_id = 0, | |
44 | .minimum_version_id = 0, | |
45 | .needed = iplb_extended_needed, | |
46 | .fields = (VMStateField[]) { | |
47 | VMSTATE_UINT8_ARRAY(reserved_ext, IplParameterBlock, 4096 - 200), | |
48 | VMSTATE_END_OF_LIST() | |
49 | } | |
50 | }; | |
51 | ||
52 | static const VMStateDescription vmstate_iplb = { | |
53 | .name = "ipl/iplb", | |
54 | .version_id = 0, | |
55 | .minimum_version_id = 0, | |
56 | .fields = (VMStateField[]) { | |
57 | VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110), | |
58 | VMSTATE_UINT16(devno, IplParameterBlock), | |
59 | VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88), | |
60 | VMSTATE_END_OF_LIST() | |
61 | }, | |
62 | .subsections = (const VMStateDescription*[]) { | |
63 | &vmstate_iplb_extended, | |
64 | NULL | |
65 | } | |
66 | }; | |
67 | ||
68 | static const VMStateDescription vmstate_ipl = { | |
69 | .name = "ipl", | |
70 | .version_id = 0, | |
71 | .minimum_version_id = 0, | |
72 | .fields = (VMStateField[]) { | |
73 | VMSTATE_UINT64(compat_start_addr, S390IPLState), | |
74 | VMSTATE_UINT64(compat_bios_start_addr, S390IPLState), | |
75 | VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock), | |
76 | VMSTATE_BOOL(iplb_valid, S390IPLState), | |
77 | VMSTATE_UINT8(cssid, S390IPLState), | |
78 | VMSTATE_UINT8(ssid, S390IPLState), | |
79 | VMSTATE_UINT16(devno, S390IPLState), | |
80 | VMSTATE_END_OF_LIST() | |
81 | } | |
82 | }; | |
83 | ||
84 | static S390IPLState *get_ipl_device(void) | |
85 | { | |
86 | return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL)); | |
87 | } | |
88 | ||
89 | static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr) | |
90 | { | |
91 | uint64_t dstaddr = *(uint64_t *) opaque; | |
92 | /* | |
93 | * Assuming that our s390-ccw.img was linked for starting at address 0, | |
94 | * we can simply add the destination address for the final location | |
95 | */ | |
96 | return srcaddr + dstaddr; | |
97 | } | |
98 | ||
99 | static void s390_ipl_realize(DeviceState *dev, Error **errp) | |
100 | { | |
101 | S390IPLState *ipl = S390_IPL(dev); | |
102 | uint64_t pentry = KERN_IMAGE_START; | |
103 | int kernel_size; | |
104 | Error *err = NULL; | |
105 | ||
106 | int bios_size; | |
107 | char *bios_filename; | |
108 | ||
109 | /* | |
110 | * Always load the bios if it was enforced, | |
111 | * even if an external kernel has been defined. | |
112 | */ | |
113 | if (!ipl->kernel || ipl->enforce_bios) { | |
114 | uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL; | |
115 | ||
116 | if (bios_name == NULL) { | |
117 | bios_name = ipl->firmware; | |
118 | } | |
119 | ||
120 | bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); | |
121 | if (bios_filename == NULL) { | |
122 | error_setg(&err, "could not find stage1 bootloader"); | |
123 | goto error; | |
124 | } | |
125 | ||
126 | bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase, | |
127 | &ipl->bios_start_addr, NULL, NULL, 1, | |
128 | EM_S390, 0, 0); | |
129 | if (bios_size > 0) { | |
130 | /* Adjust ELF start address to final location */ | |
131 | ipl->bios_start_addr += fwbase; | |
132 | } else { | |
133 | /* Try to load non-ELF file */ | |
134 | bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, | |
135 | 4096); | |
136 | ipl->bios_start_addr = ZIPL_IMAGE_START; | |
137 | } | |
138 | g_free(bios_filename); | |
139 | ||
140 | if (bios_size == -1) { | |
141 | error_setg(&err, "could not load bootloader '%s'", bios_name); | |
142 | goto error; | |
143 | } | |
144 | ||
145 | /* default boot target is the bios */ | |
146 | ipl->start_addr = ipl->bios_start_addr; | |
147 | } | |
148 | ||
149 | if (ipl->kernel) { | |
150 | kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL, | |
151 | NULL, 1, EM_S390, 0, 0); | |
152 | if (kernel_size < 0) { | |
153 | kernel_size = load_image_targphys(ipl->kernel, 0, ram_size); | |
154 | } | |
155 | if (kernel_size < 0) { | |
156 | error_setg(&err, "could not load kernel '%s'", ipl->kernel); | |
157 | goto error; | |
158 | } | |
159 | /* | |
160 | * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the | |
161 | * kernel parameters here as well. Note: For old kernels (up to 3.2) | |
162 | * we can not rely on the ELF entry point - it was 0x800 (the SALIPL | |
163 | * loader) and it won't work. For this case we force it to 0x10000, too. | |
164 | */ | |
165 | if (pentry == KERN_IMAGE_START || pentry == 0x800) { | |
166 | ipl->start_addr = KERN_IMAGE_START; | |
167 | /* Overwrite parameters in the kernel image, which are "rom" */ | |
168 | strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline); | |
169 | } else { | |
170 | ipl->start_addr = pentry; | |
171 | } | |
172 | ||
173 | if (ipl->initrd) { | |
174 | ram_addr_t initrd_offset; | |
175 | int initrd_size; | |
176 | ||
177 | initrd_offset = INITRD_START; | |
178 | while (kernel_size + 0x100000 > initrd_offset) { | |
179 | initrd_offset += 0x100000; | |
180 | } | |
181 | initrd_size = load_image_targphys(ipl->initrd, initrd_offset, | |
182 | ram_size - initrd_offset); | |
183 | if (initrd_size == -1) { | |
184 | error_setg(&err, "could not load initrd '%s'", ipl->initrd); | |
185 | goto error; | |
186 | } | |
187 | ||
188 | /* | |
189 | * we have to overwrite values in the kernel image, | |
190 | * which are "rom" | |
191 | */ | |
192 | stq_p(rom_ptr(INITRD_PARM_START), initrd_offset); | |
193 | stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size); | |
194 | } | |
195 | } | |
196 | /* | |
197 | * Don't ever use the migrated values, they could come from a different | |
198 | * BIOS and therefore don't work. But still migrate the values, so | |
199 | * QEMUs relying on it don't break. | |
200 | */ | |
201 | ipl->compat_start_addr = ipl->start_addr; | |
202 | ipl->compat_bios_start_addr = ipl->bios_start_addr; | |
203 | qemu_register_reset(qdev_reset_all_fn, dev); | |
204 | error: | |
205 | error_propagate(errp, err); | |
206 | } | |
207 | ||
208 | static Property s390_ipl_properties[] = { | |
209 | DEFINE_PROP_STRING("kernel", S390IPLState, kernel), | |
210 | DEFINE_PROP_STRING("initrd", S390IPLState, initrd), | |
211 | DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline), | |
212 | DEFINE_PROP_STRING("firmware", S390IPLState, firmware), | |
213 | DEFINE_PROP_STRING("netboot_fw", S390IPLState, netboot_fw), | |
214 | DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false), | |
215 | DEFINE_PROP_BOOL("iplbext_migration", S390IPLState, iplbext_migration, | |
216 | true), | |
217 | DEFINE_PROP_END_OF_LIST(), | |
218 | }; | |
219 | ||
220 | static bool s390_gen_initial_iplb(S390IPLState *ipl) | |
221 | { | |
222 | DeviceState *dev_st; | |
223 | ||
224 | dev_st = get_boot_device(0); | |
225 | if (dev_st) { | |
226 | VirtioCcwDevice *virtio_ccw_dev = (VirtioCcwDevice *) | |
227 | object_dynamic_cast(OBJECT(qdev_get_parent_bus(dev_st)->parent), | |
228 | TYPE_VIRTIO_CCW_DEVICE); | |
229 | SCSIDevice *sd = (SCSIDevice *) object_dynamic_cast(OBJECT(dev_st), | |
230 | TYPE_SCSI_DEVICE); | |
231 | VirtIONet *vn = (VirtIONet *) object_dynamic_cast(OBJECT(dev_st), | |
232 | TYPE_VIRTIO_NET); | |
233 | ||
234 | if (vn) { | |
235 | ipl->netboot = true; | |
236 | } | |
237 | if (virtio_ccw_dev) { | |
238 | CcwDevice *ccw_dev = CCW_DEVICE(virtio_ccw_dev); | |
239 | ||
240 | ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_CCW_LEN); | |
241 | ipl->iplb.blk0_len = | |
242 | cpu_to_be32(S390_IPLB_MIN_CCW_LEN - S390_IPLB_HEADER_LEN); | |
243 | ipl->iplb.pbt = S390_IPL_TYPE_CCW; | |
244 | ipl->iplb.ccw.devno = cpu_to_be16(ccw_dev->sch->devno); | |
245 | ipl->iplb.ccw.ssid = ccw_dev->sch->ssid & 3; | |
246 | return true; | |
247 | } else if (sd) { | |
248 | SCSIBus *bus = scsi_bus_from_device(sd); | |
249 | VirtIOSCSI *vdev = container_of(bus, VirtIOSCSI, bus); | |
250 | VirtIOSCSICcw *scsi_ccw = container_of(vdev, VirtIOSCSICcw, vdev); | |
251 | CcwDevice *ccw_dev = CCW_DEVICE(scsi_ccw); | |
252 | ||
253 | ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN); | |
254 | ipl->iplb.blk0_len = | |
255 | cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN - S390_IPLB_HEADER_LEN); | |
256 | ipl->iplb.pbt = S390_IPL_TYPE_QEMU_SCSI; | |
257 | ipl->iplb.scsi.lun = cpu_to_be32(sd->lun); | |
258 | ipl->iplb.scsi.target = cpu_to_be16(sd->id); | |
259 | ipl->iplb.scsi.channel = cpu_to_be16(sd->channel); | |
260 | ipl->iplb.scsi.devno = cpu_to_be16(ccw_dev->sch->devno); | |
261 | ipl->iplb.scsi.ssid = ccw_dev->sch->ssid & 3; | |
262 | return true; | |
263 | } | |
264 | } | |
265 | ||
266 | return false; | |
267 | } | |
268 | ||
269 | static int load_netboot_image(Error **errp) | |
270 | { | |
271 | S390IPLState *ipl = get_ipl_device(); | |
272 | char *netboot_filename; | |
273 | MemoryRegion *sysmem = get_system_memory(); | |
274 | MemoryRegion *mr = NULL; | |
275 | void *ram_ptr = NULL; | |
276 | int img_size = -1; | |
277 | ||
278 | mr = memory_region_find(sysmem, 0, 1).mr; | |
279 | if (!mr) { | |
280 | error_setg(errp, "Failed to find memory region at address 0"); | |
281 | return -1; | |
282 | } | |
283 | ||
284 | ram_ptr = memory_region_get_ram_ptr(mr); | |
285 | if (!ram_ptr) { | |
286 | error_setg(errp, "No RAM found"); | |
287 | goto unref_mr; | |
288 | } | |
289 | ||
290 | netboot_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, ipl->netboot_fw); | |
291 | if (netboot_filename == NULL) { | |
292 | error_setg(errp, "Could not find network bootloader"); | |
293 | goto unref_mr; | |
294 | } | |
295 | ||
296 | img_size = load_elf_ram(netboot_filename, NULL, NULL, &ipl->start_addr, | |
297 | NULL, NULL, 1, EM_S390, 0, 0, NULL, false); | |
298 | ||
299 | if (img_size < 0) { | |
300 | img_size = load_image_size(netboot_filename, ram_ptr, ram_size); | |
301 | ipl->start_addr = KERN_IMAGE_START; | |
302 | } | |
303 | ||
304 | if (img_size < 0) { | |
305 | error_setg(errp, "Failed to load network bootloader"); | |
306 | } | |
307 | ||
308 | g_free(netboot_filename); | |
309 | ||
310 | unref_mr: | |
311 | memory_region_unref(mr); | |
312 | return img_size; | |
313 | } | |
314 | ||
315 | static bool is_virtio_net_device(IplParameterBlock *iplb) | |
316 | { | |
317 | uint8_t cssid; | |
318 | uint8_t ssid; | |
319 | uint16_t devno; | |
320 | uint16_t schid; | |
321 | SubchDev *sch = NULL; | |
322 | ||
323 | if (iplb->pbt != S390_IPL_TYPE_CCW) { | |
324 | return false; | |
325 | } | |
326 | ||
327 | devno = be16_to_cpu(iplb->ccw.devno); | |
328 | ssid = iplb->ccw.ssid & 3; | |
329 | ||
330 | for (schid = 0; schid < MAX_SCHID; schid++) { | |
331 | for (cssid = 0; cssid < MAX_CSSID; cssid++) { | |
332 | sch = css_find_subch(1, cssid, ssid, schid); | |
333 | ||
334 | if (sch && sch->devno == devno) { | |
335 | return sch->id.cu_model == VIRTIO_ID_NET; | |
336 | } | |
337 | } | |
338 | } | |
339 | return false; | |
340 | } | |
341 | ||
342 | void s390_ipl_update_diag308(IplParameterBlock *iplb) | |
343 | { | |
344 | S390IPLState *ipl = get_ipl_device(); | |
345 | ||
346 | ipl->iplb = *iplb; | |
347 | ipl->iplb_valid = true; | |
348 | ipl->netboot = is_virtio_net_device(iplb); | |
349 | } | |
350 | ||
351 | IplParameterBlock *s390_ipl_get_iplb(void) | |
352 | { | |
353 | S390IPLState *ipl = get_ipl_device(); | |
354 | ||
355 | if (!ipl->iplb_valid) { | |
356 | return NULL; | |
357 | } | |
358 | return &ipl->iplb; | |
359 | } | |
360 | ||
361 | void s390_reipl_request(void) | |
362 | { | |
363 | S390IPLState *ipl = get_ipl_device(); | |
364 | ||
365 | ipl->reipl_requested = true; | |
366 | qemu_system_reset_request(); | |
367 | } | |
368 | ||
369 | void s390_ipl_prepare_cpu(S390CPU *cpu) | |
370 | { | |
371 | S390IPLState *ipl = get_ipl_device(); | |
372 | Error *err = NULL; | |
373 | ||
374 | cpu->env.psw.addr = ipl->start_addr; | |
375 | cpu->env.psw.mask = IPL_PSW_MASK; | |
376 | ||
377 | if (!ipl->kernel || ipl->iplb_valid) { | |
378 | cpu->env.psw.addr = ipl->bios_start_addr; | |
379 | if (!ipl->iplb_valid) { | |
380 | ipl->iplb_valid = s390_gen_initial_iplb(ipl); | |
381 | } | |
382 | } | |
383 | if (ipl->netboot) { | |
384 | if (load_netboot_image(&err) < 0) { | |
385 | error_report_err(err); | |
386 | vm_stop(RUN_STATE_INTERNAL_ERROR); | |
387 | } | |
388 | ipl->iplb.ccw.netboot_start_addr = ipl->start_addr; | |
389 | } | |
390 | } | |
391 | ||
392 | static void s390_ipl_reset(DeviceState *dev) | |
393 | { | |
394 | S390IPLState *ipl = S390_IPL(dev); | |
395 | ||
396 | if (!ipl->reipl_requested) { | |
397 | ipl->iplb_valid = false; | |
398 | memset(&ipl->iplb, 0, sizeof(IplParameterBlock)); | |
399 | } | |
400 | ipl->reipl_requested = false; | |
401 | } | |
402 | ||
403 | static void s390_ipl_class_init(ObjectClass *klass, void *data) | |
404 | { | |
405 | DeviceClass *dc = DEVICE_CLASS(klass); | |
406 | ||
407 | dc->realize = s390_ipl_realize; | |
408 | dc->props = s390_ipl_properties; | |
409 | dc->reset = s390_ipl_reset; | |
410 | dc->vmsd = &vmstate_ipl; | |
411 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); | |
412 | } | |
413 | ||
414 | static const TypeInfo s390_ipl_info = { | |
415 | .class_init = s390_ipl_class_init, | |
416 | .parent = TYPE_DEVICE, | |
417 | .name = TYPE_S390_IPL, | |
418 | .instance_size = sizeof(S390IPLState), | |
419 | }; | |
420 | ||
421 | static void s390_ipl_register_types(void) | |
422 | { | |
423 | type_register_static(&s390_ipl_info); | |
424 | } | |
425 | ||
426 | type_init(s390_ipl_register_types) |