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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 * arch/s390/kernel/early.c
3 *
4 * Copyright IBM Corp. 2007, 2009
5 * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
6 * Heiko Carstens <heiko.carstens@de.ibm.com>
7 */
8
9#define KMSG_COMPONENT "setup"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/compiler.h>
13#include <linux/init.h>
14#include <linux/errno.h>
15#include <linux/string.h>
16#include <linux/ctype.h>
17#include <linux/ftrace.h>
18#include <linux/lockdep.h>
19#include <linux/module.h>
20#include <linux/pfn.h>
21#include <linux/uaccess.h>
22#include <linux/kernel.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 "entry.h"
34
35/*
36 * Create a Kernel NSS if the SAVESYS= parameter is defined
37 */
38#define DEFSYS_CMD_SIZE 128
39#define SAVESYS_CMD_SIZE 32
40
41char kernel_nss_name[NSS_NAME_SIZE + 1];
42
43static void __init setup_boot_command_line(void);
44
45/*
46 * Get the TOD clock running.
47 */
48static void __init reset_tod_clock(void)
49{
50 u64 time;
51
52 if (store_clock(&time) == 0)
53 return;
54 /* TOD clock not running. Set the clock to Unix Epoch. */
55 if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0)
56 disabled_wait(0);
57
58 sched_clock_base_cc = TOD_UNIX_EPOCH;
59 S390_lowcore.last_update_clock = sched_clock_base_cc;
60}
61
62#ifdef CONFIG_SHARED_KERNEL
63int __init savesys_ipl_nss(char *cmd, const int cmdlen);
64
65asm(
66 " .section .init.text,\"ax\",@progbits\n"
67 " .align 4\n"
68 " .type savesys_ipl_nss, @function\n"
69 "savesys_ipl_nss:\n"
70#ifdef CONFIG_64BIT
71 " stmg 6,15,48(15)\n"
72 " lgr 14,3\n"
73 " sam31\n"
74 " diag 2,14,0x8\n"
75 " sam64\n"
76 " lgr 2,14\n"
77 " lmg 6,15,48(15)\n"
78#else
79 " stm 6,15,24(15)\n"
80 " lr 14,3\n"
81 " diag 2,14,0x8\n"
82 " lr 2,14\n"
83 " lm 6,15,24(15)\n"
84#endif
85 " br 14\n"
86 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"
87 " .previous\n");
88
89static __initdata char upper_command_line[COMMAND_LINE_SIZE];
90
91static noinline __init void create_kernel_nss(void)
92{
93 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
94#ifdef CONFIG_BLK_DEV_INITRD
95 unsigned int sinitrd_pfn, einitrd_pfn;
96#endif
97 int response;
98 int hlen;
99 size_t len;
100 char *savesys_ptr;
101 char defsys_cmd[DEFSYS_CMD_SIZE];
102 char savesys_cmd[SAVESYS_CMD_SIZE];
103
104 /* Do nothing if we are not running under VM */
105 if (!MACHINE_IS_VM)
106 return;
107
108 /* Convert COMMAND_LINE to upper case */
109 for (i = 0; i < strlen(boot_command_line); i++)
110 upper_command_line[i] = toupper(boot_command_line[i]);
111
112 savesys_ptr = strstr(upper_command_line, "SAVESYS=");
113
114 if (!savesys_ptr)
115 return;
116
117 savesys_ptr += 8; /* Point to the beginning of the NSS name */
118 for (i = 0; i < NSS_NAME_SIZE; i++) {
119 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
120 break;
121 kernel_nss_name[i] = savesys_ptr[i];
122 }
123
124 stext_pfn = PFN_DOWN(__pa(&_stext));
125 eshared_pfn = PFN_DOWN(__pa(&_eshared));
126 end_pfn = PFN_UP(__pa(&_end));
127 min_size = end_pfn << 2;
128
129 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
130 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
131 kernel_nss_name, stext_pfn - 1, stext_pfn,
132 eshared_pfn - 1, eshared_pfn, end_pfn);
133
134#ifdef CONFIG_BLK_DEV_INITRD
135 if (INITRD_START && INITRD_SIZE) {
136 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
137 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
138 min_size = einitrd_pfn << 2;
139 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
140 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
141 }
142#endif
143
144 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
145 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
146 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
147 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
148 kernel_nss_name, kernel_nss_name);
149 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
150
151 __cpcmd(defsys_cmd, NULL, 0, &response);
152
153 if (response != 0) {
154 pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
155 response);
156 kernel_nss_name[0] = '\0';
157 return;
158 }
159
160 len = strlen(savesys_cmd);
161 ASCEBC(savesys_cmd, len);
162 response = savesys_ipl_nss(savesys_cmd, len);
163
164 /* On success: response is equal to the command size,
165 * max SAVESYS_CMD_SIZE
166 * On error: response contains the numeric portion of cp error message.
167 * for SAVESYS it will be >= 263
168 * for missing privilege class, it will be 1
169 */
170 if (response > SAVESYS_CMD_SIZE || response == 1) {
171 pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
172 response);
173 kernel_nss_name[0] = '\0';
174 return;
175 }
176
177 /* re-initialize cputime accounting. */
178 sched_clock_base_cc = get_clock();
179 S390_lowcore.last_update_clock = sched_clock_base_cc;
180 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
181 S390_lowcore.user_timer = 0;
182 S390_lowcore.system_timer = 0;
183 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
184
185 /* re-setup boot command line with new ipl vm parms */
186 ipl_update_parameters();
187 setup_boot_command_line();
188
189 ipl_flags = IPL_NSS_VALID;
190}
191
192#else /* CONFIG_SHARED_KERNEL */
193
194static inline void create_kernel_nss(void) { }
195
196#endif /* CONFIG_SHARED_KERNEL */
197
198/*
199 * Clear bss memory
200 */
201static noinline __init void clear_bss_section(void)
202{
203 memset(__bss_start, 0, __bss_stop - __bss_start);
204}
205
206/*
207 * Initialize storage key for kernel pages
208 */
209static noinline __init void init_kernel_storage_key(void)
210{
211 unsigned long end_pfn, init_pfn;
212
213 end_pfn = PFN_UP(__pa(&_end));
214
215 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
216 page_set_storage_key(init_pfn << PAGE_SHIFT,
217 PAGE_DEFAULT_KEY, 0);
218}
219
220static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
221
222static noinline __init void detect_machine_type(void)
223{
224 /* Check current-configuration-level */
225 if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
226 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
227 return;
228 }
229 /* Get virtual-machine cpu information. */
230 if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count)
231 return;
232
233 /* Running under KVM? If not we assume z/VM */
234 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
235 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
236 else
237 S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
238}
239
240static void early_pgm_check_handler(void)
241{
242 unsigned long addr;
243 const struct exception_table_entry *fixup;
244
245 addr = S390_lowcore.program_old_psw.addr;
246 fixup = search_exception_tables(addr & PSW_ADDR_INSN);
247 if (!fixup)
248 disabled_wait(0);
249 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
250}
251
252static noinline __init void setup_lowcore_early(void)
253{
254 psw_t psw;
255
256 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
257 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
258 S390_lowcore.external_new_psw = psw;
259 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
260 S390_lowcore.program_new_psw = psw;
261 s390_base_pgm_handler_fn = early_pgm_check_handler;
262}
263
264static noinline __init void setup_facility_list(void)
265{
266 stfle(S390_lowcore.stfle_fac_list,
267 ARRAY_SIZE(S390_lowcore.stfle_fac_list));
268}
269
270static noinline __init void setup_hpage(void)
271{
272#ifndef CONFIG_DEBUG_PAGEALLOC
273 if (!test_facility(2) || !test_facility(8))
274 return;
275 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
276 __ctl_set_bit(0, 23);
277#endif
278}
279
280static __init void detect_mvpg(void)
281{
282#ifndef CONFIG_64BIT
283 int rc;
284
285 asm volatile(
286 " la 0,0\n"
287 " mvpg %2,%2\n"
288 "0: la %0,0\n"
289 "1:\n"
290 EX_TABLE(0b,1b)
291 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
292 if (!rc)
293 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
294#endif
295}
296
297static __init void detect_ieee(void)
298{
299#ifndef CONFIG_64BIT
300 int rc, tmp;
301
302 asm volatile(
303 " efpc %1,0\n"
304 "0: la %0,0\n"
305 "1:\n"
306 EX_TABLE(0b,1b)
307 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
308 if (!rc)
309 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
310#endif
311}
312
313static __init void detect_csp(void)
314{
315#ifndef CONFIG_64BIT
316 int rc;
317
318 asm volatile(
319 " la 0,0\n"
320 " la 1,0\n"
321 " la 2,4\n"
322 " csp 0,2\n"
323 "0: la %0,0\n"
324 "1:\n"
325 EX_TABLE(0b,1b)
326 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
327 if (!rc)
328 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
329#endif
330}
331
332static __init void detect_diag9c(void)
333{
334 unsigned int cpu_address;
335 int rc;
336
337 cpu_address = stap();
338 asm volatile(
339 " diag %2,0,0x9c\n"
340 "0: la %0,0\n"
341 "1:\n"
342 EX_TABLE(0b,1b)
343 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
344 if (!rc)
345 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
346}
347
348static __init void detect_diag44(void)
349{
350#ifdef CONFIG_64BIT
351 int rc;
352
353 asm volatile(
354 " diag 0,0,0x44\n"
355 "0: la %0,0\n"
356 "1:\n"
357 EX_TABLE(0b,1b)
358 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
359 if (!rc)
360 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
361#endif
362}
363
364static __init void detect_machine_facilities(void)
365{
366#ifdef CONFIG_64BIT
367 if (test_facility(3))
368 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
369 if (test_facility(8))
370 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
371 if (test_facility(11))
372 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
373 if (test_facility(27))
374 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
375 if (test_facility(40))
376 S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
377#endif
378}
379
380static __init void rescue_initrd(void)
381{
382#ifdef CONFIG_BLK_DEV_INITRD
383 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
384 /*
385 * Just like in case of IPL from VM reader we make sure there is a
386 * gap of 4MB between end of kernel and start of initrd.
387 * That way we can also be sure that saving an NSS will succeed,
388 * which however only requires different segments.
389 */
390 if (!INITRD_START || !INITRD_SIZE)
391 return;
392 if (INITRD_START >= min_initrd_addr)
393 return;
394 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
395 INITRD_START = min_initrd_addr;
396#endif
397}
398
399/* Set up boot command line */
400static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
401{
402 char *parm, *delim;
403 size_t rc, len;
404
405 len = strlen(boot_command_line);
406
407 delim = boot_command_line + len; /* '\0' character position */
408 parm = boot_command_line + len + 1; /* append right after '\0' */
409
410 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
411 if (rc) {
412 if (*parm == '=')
413 memmove(boot_command_line, parm + 1, rc);
414 else
415 *delim = ' '; /* replace '\0' with space */
416 }
417}
418
419static inline int has_ebcdic_char(const char *str)
420{
421 int i;
422
423 for (i = 0; str[i]; i++)
424 if (str[i] & 0x80)
425 return 1;
426 return 0;
427}
428
429static void __init setup_boot_command_line(void)
430{
431 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
432 /* convert arch command line to ascii if necessary */
433 if (has_ebcdic_char(COMMAND_LINE))
434 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
435 /* copy arch command line */
436 strlcpy(boot_command_line, strstrip(COMMAND_LINE),
437 ARCH_COMMAND_LINE_SIZE);
438
439 /* append IPL PARM data to the boot command line */
440 if (MACHINE_IS_VM)
441 append_to_cmdline(append_ipl_vmparm);
442
443 append_to_cmdline(append_ipl_scpdata);
444}
445
446
447/*
448 * Save ipl parameters, clear bss memory, initialize storage keys
449 * and create a kernel NSS at startup if the SAVESYS= parm is defined
450 */
451void __init startup_init(void)
452{
453 reset_tod_clock();
454 ipl_save_parameters();
455 rescue_initrd();
456 clear_bss_section();
457 init_kernel_storage_key();
458 lockdep_init();
459 lockdep_off();
460 sort_main_extable();
461 setup_lowcore_early();
462 setup_facility_list();
463 detect_machine_type();
464 ipl_update_parameters();
465 setup_boot_command_line();
466 create_kernel_nss();
467 detect_mvpg();
468 detect_ieee();
469 detect_csp();
470 detect_diag9c();
471 detect_diag44();
472 detect_machine_facilities();
473 setup_hpage();
474 sclp_facilities_detect();
475 detect_memory_layout(memory_chunk);
476#ifdef CONFIG_DYNAMIC_FTRACE
477 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
478#endif
479 lockdep_on();
480}