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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2007, 2009
4 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
5 */
6
7#define KMSG_COMPONENT "setup"
8#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9
10#include <linux/compiler.h>
11#include <linux/init.h>
12#include <linux/errno.h>
13#include <linux/string.h>
14#include <linux/ctype.h>
15#include <linux/lockdep.h>
16#include <linux/extable.h>
17#include <linux/pfn.h>
18#include <linux/uaccess.h>
19#include <linux/kernel.h>
20#include <asm/asm-extable.h>
21#include <linux/memblock.h>
22#include <asm/diag.h>
23#include <asm/ebcdic.h>
24#include <asm/ipl.h>
25#include <asm/lowcore.h>
26#include <asm/processor.h>
27#include <asm/sections.h>
28#include <asm/setup.h>
29#include <asm/sysinfo.h>
30#include <asm/cpcmd.h>
31#include <asm/sclp.h>
32#include <asm/facility.h>
33#include <asm/boot_data.h>
34#include <asm/switch_to.h>
35#include "entry.h"
36
37#define decompressor_handled_param(param) \
38static int __init ignore_decompressor_param_##param(char *s) \
39{ \
40 return 0; \
41} \
42early_param(#param, ignore_decompressor_param_##param)
43
44decompressor_handled_param(mem);
45decompressor_handled_param(vmalloc);
46decompressor_handled_param(dfltcc);
47decompressor_handled_param(facilities);
48decompressor_handled_param(nokaslr);
49decompressor_handled_param(cmma);
50#if IS_ENABLED(CONFIG_KVM)
51decompressor_handled_param(prot_virt);
52#endif
53
54static void __init kasan_early_init(void)
55{
56#ifdef CONFIG_KASAN
57 init_task.kasan_depth = 0;
58 sclp_early_printk("KernelAddressSanitizer initialized\n");
59#endif
60}
61
62static void __init reset_tod_clock(void)
63{
64 union tod_clock clk;
65
66 if (store_tod_clock_ext_cc(&clk) == 0)
67 return;
68 /* TOD clock not running. Set the clock to Unix Epoch. */
69 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk))
70 disabled_wait();
71
72 memset(&tod_clock_base, 0, sizeof(tod_clock_base));
73 tod_clock_base.tod = TOD_UNIX_EPOCH;
74 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
75}
76
77/*
78 * Initialize storage key for kernel pages
79 */
80static noinline __init void init_kernel_storage_key(void)
81{
82#if PAGE_DEFAULT_KEY
83 unsigned long end_pfn, init_pfn;
84
85 end_pfn = PFN_UP(__pa(_end));
86
87 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
88 page_set_storage_key(init_pfn << PAGE_SHIFT,
89 PAGE_DEFAULT_KEY, 0);
90#endif
91}
92
93static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
94
95static noinline __init void detect_machine_type(void)
96{
97 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
98
99 /* Check current-configuration-level */
100 if (stsi(NULL, 0, 0, 0) <= 2) {
101 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
102 return;
103 }
104 /* Get virtual-machine cpu information. */
105 if (stsi(vmms, 3, 2, 2) || !vmms->count)
106 return;
107
108 /* Detect known hypervisors */
109 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
110 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
111 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
112 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
113}
114
115/* Remove leading, trailing and double whitespace. */
116static inline void strim_all(char *str)
117{
118 char *s;
119
120 s = strim(str);
121 if (s != str)
122 memmove(str, s, strlen(s));
123 while (*str) {
124 if (!isspace(*str++))
125 continue;
126 if (isspace(*str)) {
127 s = skip_spaces(str);
128 memmove(str, s, strlen(s) + 1);
129 }
130 }
131}
132
133static noinline __init void setup_arch_string(void)
134{
135 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
136 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
137 char mstr[80], hvstr[17];
138
139 if (stsi(mach, 1, 1, 1))
140 return;
141 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
142 EBCASC(mach->type, sizeof(mach->type));
143 EBCASC(mach->model, sizeof(mach->model));
144 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
145 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
146 mach->manufacturer, mach->type,
147 mach->model, mach->model_capacity);
148 strim_all(mstr);
149 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
150 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
151 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
152 strim_all(hvstr);
153 } else {
154 sprintf(hvstr, "%s",
155 MACHINE_IS_LPAR ? "LPAR" :
156 MACHINE_IS_VM ? "z/VM" :
157 MACHINE_IS_KVM ? "KVM" : "unknown");
158 }
159 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
160}
161
162static __init void setup_topology(void)
163{
164 int max_mnest;
165
166 if (!test_facility(11))
167 return;
168 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
169 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
170 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
171 break;
172 }
173 topology_max_mnest = max_mnest;
174}
175
176void __do_early_pgm_check(struct pt_regs *regs)
177{
178 if (!fixup_exception(regs))
179 disabled_wait();
180}
181
182static noinline __init void setup_lowcore_early(void)
183{
184 psw_t psw;
185
186 psw.addr = (unsigned long)early_pgm_check_handler;
187 psw.mask = PSW_KERNEL_BITS;
188 S390_lowcore.program_new_psw = psw;
189 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
190}
191
192static noinline __init void setup_facility_list(void)
193{
194 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list));
195 if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
196 __clear_facility(82, alt_stfle_fac_list);
197}
198
199static __init void detect_diag9c(void)
200{
201 unsigned int cpu_address;
202 int rc;
203
204 cpu_address = stap();
205 diag_stat_inc(DIAG_STAT_X09C);
206 asm volatile(
207 " diag %2,0,0x9c\n"
208 "0: la %0,0\n"
209 "1:\n"
210 EX_TABLE(0b,1b)
211 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
212 if (!rc)
213 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
214}
215
216static __init void detect_machine_facilities(void)
217{
218 if (test_facility(8)) {
219 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
220 system_ctl_set_bit(0, CR0_EDAT_BIT);
221 }
222 if (test_facility(78))
223 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
224 if (test_facility(3))
225 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
226 if (test_facility(50) && test_facility(73)) {
227 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
228 system_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT);
229 }
230 if (test_facility(51))
231 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
232 if (test_facility(129))
233 system_ctl_set_bit(0, CR0_VECTOR_BIT);
234 if (test_facility(130))
235 S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
236 if (test_facility(133))
237 S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
238 if (test_facility(139) && (tod_clock_base.tod >> 63)) {
239 /* Enabled signed clock comparator comparisons */
240 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
241 clock_comparator_max = -1ULL >> 1;
242 system_ctl_set_bit(0, CR0_CLOCK_COMPARATOR_SIGN_BIT);
243 }
244 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
245 S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO;
246 /* the control bit is set during PCI initialization */
247 }
248 if (test_facility(194))
249 S390_lowcore.machine_flags |= MACHINE_FLAG_RDP;
250}
251
252static inline void save_vector_registers(void)
253{
254#ifdef CONFIG_CRASH_DUMP
255 if (test_facility(129))
256 save_vx_regs(boot_cpu_vector_save_area);
257#endif
258}
259
260static inline void setup_low_address_protection(void)
261{
262 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);
263}
264
265static inline void setup_access_registers(void)
266{
267 unsigned int acrs[NUM_ACRS] = { 0 };
268
269 restore_access_regs(acrs);
270}
271
272char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
273static void __init setup_boot_command_line(void)
274{
275 /* copy arch command line */
276 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
277}
278
279static void __init sort_amode31_extable(void)
280{
281 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
282}
283
284void __init startup_init(void)
285{
286 kasan_early_init();
287 reset_tod_clock();
288 time_early_init();
289 init_kernel_storage_key();
290 lockdep_off();
291 sort_amode31_extable();
292 setup_lowcore_early();
293 setup_facility_list();
294 detect_machine_type();
295 setup_arch_string();
296 setup_boot_command_line();
297 detect_diag9c();
298 detect_machine_facilities();
299 save_vector_registers();
300 setup_topology();
301 sclp_early_detect();
302 setup_low_address_protection();
303 setup_access_registers();
304 lockdep_on();
305}
1/*
2 * Copyright IBM Corp. 2007, 2009
3 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
4 * Heiko Carstens <heiko.carstens@de.ibm.com>
5 */
6
7#define KMSG_COMPONENT "setup"
8#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9
10#include <linux/compiler.h>
11#include <linux/init.h>
12#include <linux/errno.h>
13#include <linux/string.h>
14#include <linux/ctype.h>
15#include <linux/lockdep.h>
16#include <linux/module.h>
17#include <linux/pfn.h>
18#include <linux/uaccess.h>
19#include <linux/kernel.h>
20#include <asm/diag.h>
21#include <asm/ebcdic.h>
22#include <asm/ipl.h>
23#include <asm/lowcore.h>
24#include <asm/processor.h>
25#include <asm/sections.h>
26#include <asm/setup.h>
27#include <asm/sysinfo.h>
28#include <asm/cpcmd.h>
29#include <asm/sclp.h>
30#include <asm/facility.h>
31#include "entry.h"
32
33/*
34 * Create a Kernel NSS if the SAVESYS= parameter is defined
35 */
36#define DEFSYS_CMD_SIZE 128
37#define SAVESYS_CMD_SIZE 32
38
39char kernel_nss_name[NSS_NAME_SIZE + 1];
40
41static void __init setup_boot_command_line(void);
42
43/*
44 * Get the TOD clock running.
45 */
46static void __init reset_tod_clock(void)
47{
48 u64 time;
49
50 if (store_tod_clock(&time) == 0)
51 return;
52 /* TOD clock not running. Set the clock to Unix Epoch. */
53 if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
54 disabled_wait(0);
55
56 sched_clock_base_cc = TOD_UNIX_EPOCH;
57 S390_lowcore.last_update_clock = sched_clock_base_cc;
58}
59
60#ifdef CONFIG_SHARED_KERNEL
61int __init savesys_ipl_nss(char *cmd, const int cmdlen);
62
63asm(
64 " .section .init.text,\"ax\",@progbits\n"
65 " .align 4\n"
66 " .type savesys_ipl_nss, @function\n"
67 "savesys_ipl_nss:\n"
68 " stmg 6,15,48(15)\n"
69 " lgr 14,3\n"
70 " sam31\n"
71 " diag 2,14,0x8\n"
72 " sam64\n"
73 " lgr 2,14\n"
74 " lmg 6,15,48(15)\n"
75 " br 14\n"
76 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
77 " .previous\n");
78
79static __initdata char upper_command_line[COMMAND_LINE_SIZE];
80
81static noinline __init void create_kernel_nss(void)
82{
83 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
84#ifdef CONFIG_BLK_DEV_INITRD
85 unsigned int sinitrd_pfn, einitrd_pfn;
86#endif
87 int response;
88 int hlen;
89 size_t len;
90 char *savesys_ptr;
91 char defsys_cmd[DEFSYS_CMD_SIZE];
92 char savesys_cmd[SAVESYS_CMD_SIZE];
93
94 /* Do nothing if we are not running under VM */
95 if (!MACHINE_IS_VM)
96 return;
97
98 /* Convert COMMAND_LINE to upper case */
99 for (i = 0; i < strlen(boot_command_line); i++)
100 upper_command_line[i] = toupper(boot_command_line[i]);
101
102 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
103
104 if (!savesys_ptr)
105 return;
106
107 savesys_ptr += 8; /* Point to the beginning of the NSS name */
108 for (i = 0; i < NSS_NAME_SIZE; i++) {
109 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
110 break;
111 kernel_nss_name[i] = savesys_ptr[i];
112 }
113
114 stext_pfn = PFN_DOWN(__pa(&_stext));
115 eshared_pfn = PFN_DOWN(__pa(&_eshared));
116 end_pfn = PFN_UP(__pa(&_end));
117 min_size = end_pfn << 2;
118
119 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
120 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
121 kernel_nss_name, stext_pfn - 1, stext_pfn,
122 eshared_pfn - 1, eshared_pfn, end_pfn);
123
124#ifdef CONFIG_BLK_DEV_INITRD
125 if (INITRD_START && INITRD_SIZE) {
126 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
127 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
128 min_size = einitrd_pfn << 2;
129 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
130 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
131 }
132#endif
133
134 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
135 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
136 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
137 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
138 kernel_nss_name, kernel_nss_name);
139 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
140
141 __cpcmd(defsys_cmd, NULL, 0, &response);
142
143 if (response != 0) {
144 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
145 response);
146 kernel_nss_name[0] = '\0';
147 return;
148 }
149
150 len = strlen(savesys_cmd);
151 ASCEBC(savesys_cmd, len);
152 response = savesys_ipl_nss(savesys_cmd, len);
153
154 /* On success: response is equal to the command size,
155 * max SAVESYS_CMD_SIZE
156 * On error: response contains the numeric portion of cp error message.
157 * for SAVESYS it will be >= 263
158 * for missing privilege class, it will be 1
159 */
160 if (response > SAVESYS_CMD_SIZE || response == 1) {
161 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
162 response);
163 kernel_nss_name[0] = '\0';
164 return;
165 }
166
167 /* re-initialize cputime accounting. */
168 sched_clock_base_cc = get_tod_clock();
169 S390_lowcore.last_update_clock = sched_clock_base_cc;
170 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
171 S390_lowcore.user_timer = 0;
172 S390_lowcore.system_timer = 0;
173 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
174
175 /* re-setup boot command line with new ipl vm parms */
176 ipl_update_parameters();
177 setup_boot_command_line();
178
179 ipl_flags = IPL_NSS_VALID;
180}
181
182#else /* CONFIG_SHARED_KERNEL */
183
184static inline void create_kernel_nss(void) { }
185
186#endif /* CONFIG_SHARED_KERNEL */
187
188/*
189 * Clear bss memory
190 */
191static noinline __init void clear_bss_section(void)
192{
193 memset(__bss_start, 0, __bss_stop - __bss_start);
194}
195
196/*
197 * Initialize storage key for kernel pages
198 */
199static noinline __init void init_kernel_storage_key(void)
200{
201#if PAGE_DEFAULT_KEY
202 unsigned long end_pfn, init_pfn;
203
204 end_pfn = PFN_UP(__pa(&_end));
205
206 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
207 page_set_storage_key(init_pfn << PAGE_SHIFT,
208 PAGE_DEFAULT_KEY, 0);
209#endif
210}
211
212static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
213
214static noinline __init void detect_machine_type(void)
215{
216 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
217
218 /* Check current-configuration-level */
219 if (stsi(NULL, 0, 0, 0) <= 2) {
220 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
221 return;
222 }
223 /* Get virtual-machine cpu information. */
224 if (stsi(vmms, 3, 2, 2) || !vmms->count)
225 return;
226
227 /* Running under KVM? If not we assume z/VM */
228 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
229 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
230 else
231 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
232}
233
234static __init void setup_topology(void)
235{
236 int max_mnest;
237
238 if (!test_facility(11))
239 return;
240 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
241 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
242 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
243 break;
244 }
245 topology_max_mnest = max_mnest;
246}
247
248static void early_pgm_check_handler(void)
249{
250 const struct exception_table_entry *fixup;
251 unsigned long cr0, cr0_new;
252 unsigned long addr;
253
254 addr = S390_lowcore.program_old_psw.addr;
255 fixup = search_exception_tables(addr);
256 if (!fixup)
257 disabled_wait(0);
258 /* Disable low address protection before storing into lowcore. */
259 __ctl_store(cr0, 0, 0);
260 cr0_new = cr0 & ~(1UL << 28);
261 __ctl_load(cr0_new, 0, 0);
262 S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
263 __ctl_load(cr0, 0, 0);
264}
265
266static noinline __init void setup_lowcore_early(void)
267{
268 psw_t psw;
269
270 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
271 psw.addr = (unsigned long) s390_base_ext_handler;
272 S390_lowcore.external_new_psw = psw;
273 psw.addr = (unsigned long) s390_base_pgm_handler;
274 S390_lowcore.program_new_psw = psw;
275 s390_base_pgm_handler_fn = early_pgm_check_handler;
276}
277
278static noinline __init void setup_facility_list(void)
279{
280 stfle(S390_lowcore.stfle_fac_list,
281 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
282}
283
284static __init void detect_diag9c(void)
285{
286 unsigned int cpu_address;
287 int rc;
288
289 cpu_address = stap();
290 diag_stat_inc(DIAG_STAT_X09C);
291 asm volatile(
292 " diag %2,0,0x9c\n"
293 "0: la %0,0\n"
294 "1:\n"
295 EX_TABLE(0b,1b)
296 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
297 if (!rc)
298 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
299}
300
301static __init void detect_diag44(void)
302{
303 int rc;
304
305 diag_stat_inc(DIAG_STAT_X044);
306 asm volatile(
307 " diag 0,0,0x44\n"
308 "0: la %0,0\n"
309 "1:\n"
310 EX_TABLE(0b,1b)
311 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
312 if (!rc)
313 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
314}
315
316static __init void detect_machine_facilities(void)
317{
318 if (test_facility(8)) {
319 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
320 __ctl_set_bit(0, 23);
321 }
322 if (test_facility(78))
323 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
324 if (test_facility(3))
325 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
326 if (test_facility(40))
327 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
328 if (test_facility(50) && test_facility(73))
329 S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
330 if (test_facility(51))
331 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
332 if (test_facility(129)) {
333 S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
334 __ctl_set_bit(0, 17);
335 }
336}
337
338static inline void save_vector_registers(void)
339{
340#ifdef CONFIG_CRASH_DUMP
341 if (test_facility(129))
342 save_vx_regs(boot_cpu_vector_save_area);
343#endif
344}
345
346static int __init disable_vector_extension(char *str)
347{
348 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
349 __ctl_clear_bit(0, 17);
350 return 1;
351}
352early_param("novx", disable_vector_extension);
353
354static int __init cad_setup(char *str)
355{
356 int val;
357
358 get_option(&str, &val);
359 if (val && test_facility(128))
360 S390_lowcore.machine_flags |= MACHINE_FLAG_CAD;
361 return 0;
362}
363early_param("cad", cad_setup);
364
365static int __init cad_init(void)
366{
367 if (MACHINE_HAS_CAD)
368 /* Enable problem state CAD. */
369 __ctl_set_bit(2, 3);
370 return 0;
371}
372early_initcall(cad_init);
373
374static __init void rescue_initrd(void)
375{
376#ifdef CONFIG_BLK_DEV_INITRD
377 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
378 /*
379 * Just like in case of IPL from VM reader we make sure there is a
380 * gap of 4MB between end of kernel and start of initrd.
381 * That way we can also be sure that saving an NSS will succeed,
382 * which however only requires different segments.
383 */
384 if (!INITRD_START || !INITRD_SIZE)
385 return;
386 if (INITRD_START >= min_initrd_addr)
387 return;
388 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
389 INITRD_START = min_initrd_addr;
390#endif
391}
392
393/* Set up boot command line */
394static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
395{
396 char *parm, *delim;
397 size_t rc, len;
398
399 len = strlen(boot_command_line);
400
401 delim = boot_command_line + len; /* '\0' character position */
402 parm = boot_command_line + len + 1; /* append right after '\0' */
403
404 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
405 if (rc) {
406 if (*parm == '=')
407 memmove(boot_command_line, parm + 1, rc);
408 else
409 *delim = ' '; /* replace '\0' with space */
410 }
411}
412
413static inline int has_ebcdic_char(const char *str)
414{
415 int i;
416
417 for (i = 0; str[i]; i++)
418 if (str[i] & 0x80)
419 return 1;
420 return 0;
421}
422
423static void __init setup_boot_command_line(void)
424{
425 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
426 /* convert arch command line to ascii if necessary */
427 if (has_ebcdic_char(COMMAND_LINE))
428 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
429 /* copy arch command line */
430 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
431 ARCH_COMMAND_LINE_SIZE);
432
433 /* append IPL PARM data to the boot command line */
434 if (MACHINE_IS_VM)
435 append_to_cmdline(append_ipl_vmparm);
436
437 append_to_cmdline(append_ipl_scpdata);
438}
439
440/*
441 * Save ipl parameters, clear bss memory, initialize storage keys
442 * and create a kernel NSS at startup if the SAVESYS= parm is defined
443 */
444void __init startup_init(void)
445{
446 reset_tod_clock();
447 ipl_save_parameters();
448 rescue_initrd();
449 clear_bss_section();
450 init_kernel_storage_key();
451 lockdep_off();
452 setup_lowcore_early();
453 setup_facility_list();
454 detect_machine_type();
455 ipl_update_parameters();
456 setup_boot_command_line();
457 create_kernel_nss();
458 detect_diag9c();
459 detect_diag44();
460 detect_machine_facilities();
461 save_vector_registers();
462 setup_topology();
463 sclp_early_detect();
464 lockdep_on();
465}