These changes are the raw update to qemu-2.6.
[kvmfornfv.git] / qemu / hw / s390x / ipl.c
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
24 #define KERN_IMAGE_START                0x010000UL
25 #define KERN_PARM_AREA                  0x010480UL
26 #define INITRD_START                    0x800000UL
27 #define INITRD_PARM_START               0x010408UL
28 #define INITRD_PARM_SIZE                0x010410UL
29 #define PARMFILE_START                  0x001000UL
30 #define ZIPL_IMAGE_START                0x009000UL
31 #define IPL_PSW_MASK                    (PSW_MASK_32 | PSW_MASK_64)
32
33 static const VMStateDescription vmstate_iplb = {
34     .name = "ipl/iplb",
35     .version_id = 0,
36     .minimum_version_id = 0,
37     .fields = (VMStateField[]) {
38         VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110),
39         VMSTATE_UINT16(devno, IplParameterBlock),
40         VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88),
41         VMSTATE_END_OF_LIST()
42     }
43 };
44
45 static const VMStateDescription vmstate_ipl = {
46     .name = "ipl",
47     .version_id = 0,
48     .minimum_version_id = 0,
49     .fields = (VMStateField[]) {
50         VMSTATE_UINT64(start_addr, S390IPLState),
51         VMSTATE_UINT64(bios_start_addr, S390IPLState),
52         VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock),
53         VMSTATE_BOOL(iplb_valid, S390IPLState),
54         VMSTATE_UINT8(cssid, S390IPLState),
55         VMSTATE_UINT8(ssid, S390IPLState),
56         VMSTATE_UINT16(devno, S390IPLState),
57         VMSTATE_END_OF_LIST()
58      }
59 };
60
61 static S390IPLState *get_ipl_device(void)
62 {
63     return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL));
64 }
65
66 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
67 {
68     uint64_t dstaddr = *(uint64_t *) opaque;
69     /*
70      * Assuming that our s390-ccw.img was linked for starting at address 0,
71      * we can simply add the destination address for the final location
72      */
73     return srcaddr + dstaddr;
74 }
75
76 static void s390_ipl_realize(DeviceState *dev, Error **errp)
77 {
78     S390IPLState *ipl = S390_IPL(dev);
79     uint64_t pentry = KERN_IMAGE_START;
80     int kernel_size;
81     Error *err = NULL;
82
83     int bios_size;
84     char *bios_filename;
85
86     /*
87      * Always load the bios if it was enforced,
88      * even if an external kernel has been defined.
89      */
90     if (!ipl->kernel || ipl->enforce_bios) {
91         uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL;
92
93         if (bios_name == NULL) {
94             bios_name = ipl->firmware;
95         }
96
97         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
98         if (bios_filename == NULL) {
99             error_setg(&err, "could not find stage1 bootloader");
100             goto error;
101         }
102
103         bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
104                              &ipl->bios_start_addr, NULL, NULL, 1,
105                              EM_S390, 0, 0);
106         if (bios_size > 0) {
107             /* Adjust ELF start address to final location */
108             ipl->bios_start_addr += fwbase;
109         } else {
110             /* Try to load non-ELF file (e.g. s390-ccw.img) */
111             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
112                                             4096);
113             ipl->bios_start_addr = ZIPL_IMAGE_START;
114         }
115         g_free(bios_filename);
116
117         if (bios_size == -1) {
118             error_setg(&err, "could not load bootloader '%s'", bios_name);
119             goto error;
120         }
121
122         /* default boot target is the bios */
123         ipl->start_addr = ipl->bios_start_addr;
124     }
125
126     if (ipl->kernel) {
127         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
128                                NULL, 1, EM_S390, 0, 0);
129         if (kernel_size < 0) {
130             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
131         }
132         if (kernel_size < 0) {
133             error_setg(&err, "could not load kernel '%s'", ipl->kernel);
134             goto error;
135         }
136         /*
137          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
138          * kernel parameters here as well. Note: For old kernels (up to 3.2)
139          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
140          * loader) and it won't work. For this case we force it to 0x10000, too.
141          */
142         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
143             ipl->start_addr = KERN_IMAGE_START;
144             /* Overwrite parameters in the kernel image, which are "rom" */
145             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
146         } else {
147             ipl->start_addr = pentry;
148         }
149
150         if (ipl->initrd) {
151             ram_addr_t initrd_offset;
152             int initrd_size;
153
154             initrd_offset = INITRD_START;
155             while (kernel_size + 0x100000 > initrd_offset) {
156                 initrd_offset += 0x100000;
157             }
158             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
159                                               ram_size - initrd_offset);
160             if (initrd_size == -1) {
161                 error_setg(&err, "could not load initrd '%s'", ipl->initrd);
162                 goto error;
163             }
164
165             /*
166              * we have to overwrite values in the kernel image,
167              * which are "rom"
168              */
169             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
170             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
171         }
172     }
173     qemu_register_reset(qdev_reset_all_fn, dev);
174 error:
175     error_propagate(errp, err);
176 }
177
178 static Property s390_ipl_properties[] = {
179     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
180     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
181     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
182     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
183     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
184     DEFINE_PROP_END_OF_LIST(),
185 };
186
187 /*
188  * In addition to updating the iplstate, this function returns:
189  * - 0 if system was ipled with external kernel
190  * - -1 if no valid boot device was found
191  * - ccw id of the boot device otherwise
192  */
193 static uint64_t s390_update_iplstate(S390IPLState *ipl)
194 {
195     DeviceState *dev_st;
196
197     if (ipl->iplb_valid) {
198         ipl->cssid = 0;
199         ipl->ssid = 0;
200         ipl->devno = ipl->iplb.devno;
201         goto out;
202     }
203
204     if (ipl->kernel) {
205         return 0;
206     }
207
208     dev_st = get_boot_device(0);
209     if (dev_st) {
210         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
211             OBJECT(qdev_get_parent_bus(dev_st)->parent),
212                 TYPE_VIRTIO_CCW_DEVICE);
213         if (ccw_dev) {
214             ipl->cssid = ccw_dev->sch->cssid;
215             ipl->ssid = ccw_dev->sch->ssid;
216             ipl->devno = ccw_dev->sch->devno;
217             goto out;
218         }
219     }
220
221     return -1;
222 out:
223     return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno);
224 }
225
226 void s390_ipl_update_diag308(IplParameterBlock *iplb)
227 {
228     S390IPLState *ipl = get_ipl_device();
229
230     ipl->iplb = *iplb;
231     ipl->iplb_valid = true;
232 }
233
234 IplParameterBlock *s390_ipl_get_iplb(void)
235 {
236     S390IPLState *ipl = get_ipl_device();
237
238     if (!ipl->iplb_valid) {
239         return NULL;
240     }
241     return &ipl->iplb;
242 }
243
244 void s390_reipl_request(void)
245 {
246     S390IPLState *ipl = get_ipl_device();
247
248     ipl->reipl_requested = true;
249     qemu_system_reset_request();
250 }
251
252 void s390_ipl_prepare_cpu(S390CPU *cpu)
253 {
254     S390IPLState *ipl = get_ipl_device();
255
256     cpu->env.psw.addr = ipl->start_addr;
257     cpu->env.psw.mask = IPL_PSW_MASK;
258
259     if (!ipl->kernel || ipl->iplb_valid) {
260         cpu->env.psw.addr = ipl->bios_start_addr;
261         cpu->env.regs[7] = s390_update_iplstate(ipl);
262     }
263 }
264
265 static void s390_ipl_reset(DeviceState *dev)
266 {
267     S390IPLState *ipl = S390_IPL(dev);
268
269     if (!ipl->reipl_requested) {
270         ipl->iplb_valid = false;
271     }
272     ipl->reipl_requested = false;
273 }
274
275 static void s390_ipl_class_init(ObjectClass *klass, void *data)
276 {
277     DeviceClass *dc = DEVICE_CLASS(klass);
278
279     dc->realize = s390_ipl_realize;
280     dc->props = s390_ipl_properties;
281     dc->reset = s390_ipl_reset;
282     dc->vmsd = &vmstate_ipl;
283     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
284 }
285
286 static const TypeInfo s390_ipl_info = {
287     .class_init = s390_ipl_class_init,
288     .parent = TYPE_DEVICE,
289     .name  = TYPE_S390_IPL,
290     .instance_size  = sizeof(S390IPLState),
291 };
292
293 static void s390_ipl_register_types(void)
294 {
295     type_register_static(&s390_ipl_info);
296 }
297
298 type_init(s390_ipl_register_types)