]> Git Repo - qemu.git/blob - hw/s390x/ipl.c
S390: IPL: Support ELF firmware
[qemu.git] / hw / s390x / ipl.c
1 /*
2  * bootloader support
3  *
4  * Copyright IBM, Corp. 2012
5  *
6  * Authors:
7  *  Christian Borntraeger <[email protected]>
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
20 #define KERN_IMAGE_START                0x010000UL
21 #define KERN_PARM_AREA                  0x010480UL
22 #define INITRD_START                    0x800000UL
23 #define INITRD_PARM_START               0x010408UL
24 #define INITRD_PARM_SIZE                0x010410UL
25 #define PARMFILE_START                  0x001000UL
26 #define ZIPL_FILENAME                   "s390-zipl.rom"
27 #define ZIPL_IMAGE_START                0x009000UL
28 #define IPL_PSW_MASK                    (PSW_MASK_32 | PSW_MASK_64)
29
30 #define TYPE_S390_IPL "s390-ipl"
31 #define S390_IPL(obj) \
32     OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL)
33 #if 0
34 #define S390_IPL_CLASS(klass) \
35     OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL)
36 #define S390_IPL_GET_CLASS(obj) \
37     OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL)
38 #endif
39
40 typedef struct S390IPLClass {
41     /*< private >*/
42     SysBusDeviceClass parent_class;
43     /*< public >*/
44
45     void (*parent_reset) (SysBusDevice *dev);
46 } S390IPLClass;
47
48 typedef struct S390IPLState {
49     /*< private >*/
50     SysBusDevice parent_obj;
51     uint64_t start_addr;
52
53     /*< public >*/
54     char *kernel;
55     char *initrd;
56     char *cmdline;
57 } S390IPLState;
58
59
60 static void s390_ipl_cpu(uint64_t pswaddr)
61 {
62     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
63     CPUS390XState *env = &cpu->env;
64
65     env->psw.addr = pswaddr;
66     env->psw.mask = IPL_PSW_MASK;
67     s390_add_running_cpu(cpu);
68 }
69
70 static int s390_ipl_init(SysBusDevice *dev)
71 {
72     S390IPLState *ipl = S390_IPL(dev);
73     ram_addr_t kernel_size = 0;
74
75     if (!ipl->kernel) {
76         ram_addr_t bios_size = 0;
77         char *bios_filename;
78
79         /* Load zipl bootloader */
80         if (bios_name == NULL) {
81             bios_name = ZIPL_FILENAME;
82         }
83
84         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
85         bios_size = load_elf(bios_filename, NULL, NULL, &ipl->start_addr, NULL,
86                              NULL, 1, ELF_MACHINE, 0);
87         if (bios_size == -1UL) {
88             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
89                                             4096);
90             ipl->start_addr = ZIPL_IMAGE_START;
91             if (bios_size > 4096) {
92                 hw_error("stage1 bootloader is > 4k\n");
93             }
94         }
95         g_free(bios_filename);
96
97         if ((long)bios_size < 0) {
98             hw_error("could not load bootloader '%s'\n", bios_name);
99         }
100         return 0;
101     } else {
102         kernel_size = load_elf(ipl->kernel, NULL, NULL, NULL, NULL,
103                                NULL, 1, ELF_MACHINE, 0);
104         if (kernel_size == -1UL) {
105             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
106         }
107         if (kernel_size == -1UL) {
108             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
109             return -1;
110         }
111         /* we have to overwrite values in the kernel image, which are "rom" */
112         strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
113
114         /*
115          * we can not rely on the ELF entry point, since up to 3.2 this
116          * value was 0x800 (the SALIPL loader) and it wont work. For
117          * all (Linux) cases 0x10000 (KERN_IMAGE_START) should be fine.
118          */
119         ipl->start_addr = KERN_IMAGE_START;
120     }
121     if (ipl->initrd) {
122         ram_addr_t initrd_offset, initrd_size;
123
124         initrd_offset = INITRD_START;
125         while (kernel_size + 0x100000 > initrd_offset) {
126             initrd_offset += 0x100000;
127         }
128         initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
129                                           ram_size - initrd_offset);
130         if (initrd_size == -1UL) {
131             fprintf(stderr, "qemu: could not load initrd '%s'\n", ipl->initrd);
132             exit(1);
133         }
134
135         /* we have to overwrite values in the kernel image, which are "rom" */
136         stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
137         stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
138     }
139
140     return 0;
141 }
142
143 static Property s390_ipl_properties[] = {
144     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
145     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
146     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
147     DEFINE_PROP_END_OF_LIST(),
148 };
149
150 static void s390_ipl_reset(DeviceState *dev)
151 {
152     S390IPLState *ipl = S390_IPL(dev);
153
154     s390_ipl_cpu(ipl->start_addr);
155 }
156
157 static void s390_ipl_class_init(ObjectClass *klass, void *data)
158 {
159     DeviceClass *dc = DEVICE_CLASS(klass);
160     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
161
162     k->init = s390_ipl_init;
163     dc->props = s390_ipl_properties;
164     dc->reset = s390_ipl_reset;
165     dc->no_user = 1;
166 }
167
168 static const TypeInfo s390_ipl_info = {
169     .class_init = s390_ipl_class_init,
170     .parent = TYPE_SYS_BUS_DEVICE,
171     .name  = "s390-ipl",
172     .instance_size  = sizeof(S390IPLState),
173 };
174
175 static void s390_ipl_register_types(void)
176 {
177     type_register_static(&s390_ipl_info);
178 }
179
180 type_init(s390_ipl_register_types)
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