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11#include "libc.h"
12#include "helper.h"
13#include "s390-arch.h"
14#include "s390-ccw.h"
15#include "cio.h"
16#include "virtio.h"
17#include "dasd-ipl.h"
18
19char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
20static SubChannelId blk_schid = { .one = 1 };
21static char loadparm_str[LOADPARM_LEN + 1];
22QemuIplParameters qipl;
23IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
24static bool have_iplb;
25static uint16_t cutype;
26LowCore *lowcore;
27
28#define LOADPARM_PROMPT "PROMPT "
29#define LOADPARM_EMPTY " "
30#define BOOT_MENU_FLAG_MASK (QIPL_FLAG_BM_OPTS_CMD | QIPL_FLAG_BM_OPTS_ZIPL)
31
32
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35
36
37void write_subsystem_identification(void)
38{
39 lowcore->subchannel_id = blk_schid.sch_id;
40 lowcore->subchannel_nr = blk_schid.sch_no;
41 lowcore->io_int_parm = 0;
42}
43
44void write_iplb_location(void)
45{
46 lowcore->ptr_iplb = ptr2u32(&iplb);
47}
48
49unsigned int get_loadparm_index(void)
50{
51 return atoui(loadparm_str);
52}
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61
62
63static bool find_subch(int dev_no)
64{
65 Schib schib;
66 int i, r;
67 bool is_virtio;
68
69 for (i = 0; i < 0x10000; i++) {
70 blk_schid.sch_no = i;
71 r = stsch_err(blk_schid, &schib);
72 if ((r == 3) || (r == -EIO)) {
73 break;
74 }
75 if (!schib.pmcw.dnv) {
76 continue;
77 }
78
79 enable_subchannel(blk_schid);
80 cutype = cu_type(blk_schid);
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84
85
86 is_virtio = virtio_is_supported(blk_schid);
87
88
89 if (dev_no < 0) {
90 switch (cutype) {
91 case CU_TYPE_VIRTIO:
92 if (is_virtio) {
93
94
95
96
97 if (virtio_get_device_type() != VIRTIO_ID_NET) {
98 return true;
99 }
100 }
101 continue;
102 case CU_TYPE_DASD_3990:
103 case CU_TYPE_DASD_2107:
104 return true;
105 default:
106 continue;
107 }
108 }
109
110
111 if (schib.pmcw.dev == dev_no) {
112 return true;
113 }
114 }
115
116 return false;
117}
118
119static void menu_setup(void)
120{
121 if (memcmp(loadparm_str, LOADPARM_PROMPT, LOADPARM_LEN) == 0) {
122 menu_set_parms(QIPL_FLAG_BM_OPTS_CMD, 0);
123 return;
124 }
125
126
127 if (memcmp(loadparm_str, LOADPARM_EMPTY, LOADPARM_LEN) != 0) {
128 return;
129 }
130
131 switch (iplb.pbt) {
132 case S390_IPL_TYPE_CCW:
133 case S390_IPL_TYPE_QEMU_SCSI:
134 menu_set_parms(qipl.qipl_flags & BOOT_MENU_FLAG_MASK,
135 qipl.boot_menu_timeout);
136 return;
137 }
138}
139
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142
143static void css_setup(void)
144{
145
146
147
148
149 enable_mss_facility();
150}
151
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153
154
155
156static void boot_setup(void)
157{
158 char lpmsg[] = "LOADPARM=[________]\n";
159
160 sclp_get_loadparm_ascii(loadparm_str);
161 memcpy(lpmsg + 10, loadparm_str, 8);
162 sclp_print(lpmsg);
163
164 have_iplb = store_iplb(&iplb);
165}
166
167static void find_boot_device(void)
168{
169 VDev *vdev = virtio_get_device();
170 int ssid;
171 bool found;
172
173 if (!have_iplb) {
174 for (ssid = 0; ssid < 0x3; ssid++) {
175 blk_schid.ssid = ssid;
176 found = find_subch(-1);
177 if (found) {
178 return;
179 }
180 }
181 panic("Could not find a suitable boot device (none specified)\n");
182 }
183
184 switch (iplb.pbt) {
185 case S390_IPL_TYPE_CCW:
186 debug_print_int("device no. ", iplb.ccw.devno);
187 blk_schid.ssid = iplb.ccw.ssid & 0x3;
188 debug_print_int("ssid ", blk_schid.ssid);
189 found = find_subch(iplb.ccw.devno);
190 break;
191 case S390_IPL_TYPE_QEMU_SCSI:
192 vdev->scsi_device_selected = true;
193 vdev->selected_scsi_device.channel = iplb.scsi.channel;
194 vdev->selected_scsi_device.target = iplb.scsi.target;
195 vdev->selected_scsi_device.lun = iplb.scsi.lun;
196 blk_schid.ssid = iplb.scsi.ssid & 0x3;
197 found = find_subch(iplb.scsi.devno);
198 break;
199 default:
200 panic("List-directed IPL not supported yet!\n");
201 }
202
203 IPL_assert(found, "Boot device not found\n");
204}
205
206static void virtio_setup(void)
207{
208 VDev *vdev = virtio_get_device();
209 QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS;
210
211 memcpy(&qipl, early_qipl, sizeof(QemuIplParameters));
212
213 if (have_iplb) {
214 menu_setup();
215 }
216
217 if (virtio_get_device_type() == VIRTIO_ID_NET) {
218 sclp_print("Network boot device detected\n");
219 vdev->netboot_start_addr = qipl.netboot_start_addr;
220 } else {
221 virtio_blk_setup_device(blk_schid);
222 IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected");
223 }
224}
225
226int main(void)
227{
228 sclp_setup();
229 css_setup();
230 boot_setup();
231 find_boot_device();
232 enable_subchannel(blk_schid);
233
234 switch (cutype) {
235 case CU_TYPE_DASD_3990:
236 case CU_TYPE_DASD_2107:
237 dasd_ipl(blk_schid, cutype);
238 break;
239 case CU_TYPE_VIRTIO:
240 virtio_setup();
241 zipl_load();
242 break;
243 default:
244 print_int("Attempting to boot from unexpected device type", cutype);
245 panic("");
246 }
247
248 panic("Failed to load OS from hard disk\n");
249 return 0;
250}
251