xref: /openbmc/qemu/hw/s390x/ipl.c (revision 14a650ec)
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 "sysemu/sysemu.h"
15 #include "cpu.h"
16 #include "elf.h"
17 #include "hw/loader.h"
18 #include "hw/sysbus.h"
19 #include "hw/s390x/virtio-ccw.h"
20 #include "hw/s390x/css.h"
21 
22 #define KERN_IMAGE_START                0x010000UL
23 #define KERN_PARM_AREA                  0x010480UL
24 #define INITRD_START                    0x800000UL
25 #define INITRD_PARM_START               0x010408UL
26 #define INITRD_PARM_SIZE                0x010410UL
27 #define PARMFILE_START                  0x001000UL
28 #define ZIPL_IMAGE_START                0x009000UL
29 #define IPL_PSW_MASK                    (PSW_MASK_32 | PSW_MASK_64)
30 
31 #define TYPE_S390_IPL "s390-ipl"
32 #define S390_IPL(obj) \
33     OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL)
34 #if 0
35 #define S390_IPL_CLASS(klass) \
36     OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL)
37 #define S390_IPL_GET_CLASS(obj) \
38     OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL)
39 #endif
40 
41 typedef struct S390IPLClass {
42     /*< private >*/
43     SysBusDeviceClass parent_class;
44     /*< public >*/
45 
46     void (*parent_reset) (SysBusDevice *dev);
47 } S390IPLClass;
48 
49 typedef struct S390IPLState {
50     /*< private >*/
51     SysBusDevice parent_obj;
52     uint64_t start_addr;
53 
54     /*< public >*/
55     char *kernel;
56     char *initrd;
57     char *cmdline;
58     char *firmware;
59 } S390IPLState;
60 
61 
62 static int s390_ipl_init(SysBusDevice *dev)
63 {
64     S390IPLState *ipl = S390_IPL(dev);
65     ram_addr_t kernel_size = 0;
66 
67     if (!ipl->kernel) {
68         ram_addr_t bios_size = 0;
69         char *bios_filename;
70 
71         /* Load zipl bootloader */
72         if (bios_name == NULL) {
73             bios_name = ipl->firmware;
74         }
75 
76         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
77         if (bios_filename == NULL) {
78             hw_error("could not find stage1 bootloader\n");
79         }
80 
81         bios_size = load_elf(bios_filename, NULL, NULL, &ipl->start_addr, NULL,
82                              NULL, 1, ELF_MACHINE, 0);
83         if (bios_size == -1UL) {
84             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
85                                             4096);
86             ipl->start_addr = ZIPL_IMAGE_START;
87             if (bios_size > 4096) {
88                 hw_error("stage1 bootloader is > 4k\n");
89             }
90         }
91         g_free(bios_filename);
92 
93         if ((long)bios_size < 0) {
94             hw_error("could not load bootloader '%s'\n", bios_name);
95         }
96         return 0;
97     } else {
98         kernel_size = load_elf(ipl->kernel, NULL, NULL, NULL, NULL,
99                                NULL, 1, ELF_MACHINE, 0);
100         if (kernel_size == -1UL) {
101             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
102         }
103         if (kernel_size == -1UL) {
104             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
105             return -1;
106         }
107         /* we have to overwrite values in the kernel image, which are "rom" */
108         strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
109 
110         /*
111          * we can not rely on the ELF entry point, since up to 3.2 this
112          * value was 0x800 (the SALIPL loader) and it wont work. For
113          * all (Linux) cases 0x10000 (KERN_IMAGE_START) should be fine.
114          */
115         ipl->start_addr = KERN_IMAGE_START;
116     }
117     if (ipl->initrd) {
118         ram_addr_t initrd_offset, initrd_size;
119 
120         initrd_offset = INITRD_START;
121         while (kernel_size + 0x100000 > initrd_offset) {
122             initrd_offset += 0x100000;
123         }
124         initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
125                                           ram_size - initrd_offset);
126         if (initrd_size == -1UL) {
127             fprintf(stderr, "qemu: could not load initrd '%s'\n", ipl->initrd);
128             exit(1);
129         }
130 
131         /* we have to overwrite values in the kernel image, which are "rom" */
132         stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
133         stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
134     }
135 
136     return 0;
137 }
138 
139 static Property s390_ipl_properties[] = {
140     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
141     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
142     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
143     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
144     DEFINE_PROP_END_OF_LIST(),
145 };
146 
147 static void s390_ipl_reset(DeviceState *dev)
148 {
149     S390IPLState *ipl = S390_IPL(dev);
150     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
151     CPUS390XState *env = &cpu->env;
152 
153     env->psw.addr = ipl->start_addr;
154     env->psw.mask = IPL_PSW_MASK;
155 
156     if (!ipl->kernel) {
157         /* Tell firmware, if there is a preferred boot device */
158         env->regs[7] = -1;
159         DeviceState *dev_st = get_boot_device(0);
160         if (dev_st) {
161             VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
162                 OBJECT(qdev_get_parent_bus(dev_st)->parent),
163                 TYPE_VIRTIO_CCW_DEVICE);
164 
165             if (ccw_dev) {
166                 env->regs[7] = ccw_dev->sch->cssid << 24 |
167                                ccw_dev->sch->ssid << 16 |
168                                ccw_dev->sch->devno;
169             }
170         }
171     }
172 
173     s390_add_running_cpu(cpu);
174 }
175 
176 static void s390_ipl_class_init(ObjectClass *klass, void *data)
177 {
178     DeviceClass *dc = DEVICE_CLASS(klass);
179     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
180 
181     k->init = s390_ipl_init;
182     dc->props = s390_ipl_properties;
183     dc->reset = s390_ipl_reset;
184     dc->no_user = 1;
185 }
186 
187 static const TypeInfo s390_ipl_info = {
188     .class_init = s390_ipl_class_init,
189     .parent = TYPE_SYS_BUS_DEVICE,
190     .name  = "s390-ipl",
191     .instance_size  = sizeof(S390IPLState),
192 };
193 
194 static void s390_ipl_register_types(void)
195 {
196     type_register_static(&s390_ipl_info);
197 }
198 
199 type_init(s390_ipl_register_types)
200