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a17ae4c3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 | 3 | * S390 version |
a53c8fab | 4 | * Copyright IBM Corp. 1999, 2012 |
1da177e4 LT |
5 | * Author(s): Hartmut Penner (hp@de.ibm.com), |
6 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
7 | * | |
8 | * Derived from "arch/i386/kernel/setup.c" | |
9 | * Copyright (C) 1995, Linus Torvalds | |
10 | */ | |
11 | ||
12 | /* | |
13 | * This file handles the architecture-dependent parts of initialization | |
14 | */ | |
15 | ||
3b6ed4ab MS |
16 | #define KMSG_COMPONENT "setup" |
17 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
18 | ||
1da177e4 | 19 | #include <linux/errno.h> |
0872922f | 20 | #include <linux/export.h> |
1da177e4 | 21 | #include <linux/sched.h> |
29930025 | 22 | #include <linux/sched/task.h> |
1777e463 | 23 | #include <linux/cpu.h> |
1da177e4 | 24 | #include <linux/kernel.h> |
ff38df37 | 25 | #include <linux/memblock.h> |
1da177e4 LT |
26 | #include <linux/mm.h> |
27 | #include <linux/stddef.h> | |
28 | #include <linux/unistd.h> | |
29 | #include <linux/ptrace.h> | |
bcfcbb6b | 30 | #include <linux/random.h> |
1da177e4 | 31 | #include <linux/user.h> |
1da177e4 LT |
32 | #include <linux/tty.h> |
33 | #include <linux/ioport.h> | |
34 | #include <linux/delay.h> | |
1da177e4 LT |
35 | #include <linux/init.h> |
36 | #include <linux/initrd.h> | |
37 | #include <linux/bootmem.h> | |
38 | #include <linux/root_dev.h> | |
39 | #include <linux/console.h> | |
1da177e4 | 40 | #include <linux/kernel_stat.h> |
e1231b0e | 41 | #include <linux/dma-contiguous.h> |
1e8e3383 | 42 | #include <linux/device.h> |
585c3047 | 43 | #include <linux/notifier.h> |
65912a84 | 44 | #include <linux/pfn.h> |
fe355b7f | 45 | #include <linux/ctype.h> |
2b67fc46 | 46 | #include <linux/reboot.h> |
dbd70fb4 | 47 | #include <linux/topology.h> |
60a0c68d MH |
48 | #include <linux/kexec.h> |
49 | #include <linux/crash_dump.h> | |
50 | #include <linux/memory.h> | |
048cd4e5 | 51 | #include <linux/compat.h> |
1da177e4 | 52 | |
46b05d26 | 53 | #include <asm/ipl.h> |
1e3cab2f | 54 | #include <asm/facility.h> |
1da177e4 LT |
55 | #include <asm/smp.h> |
56 | #include <asm/mmu_context.h> | |
57 | #include <asm/cpcmd.h> | |
58 | #include <asm/lowcore.h> | |
6c81511c | 59 | #include <asm/nmi.h> |
1da177e4 | 60 | #include <asm/irq.h> |
0b642ede PO |
61 | #include <asm/page.h> |
62 | #include <asm/ptrace.h> | |
cc13ad62 | 63 | #include <asm/sections.h> |
fe355b7f | 64 | #include <asm/ebcdic.h> |
60a0c68d | 65 | #include <asm/diag.h> |
4857d4bb | 66 | #include <asm/os_info.h> |
cd183459 | 67 | #include <asm/sclp.h> |
bcfcbb6b | 68 | #include <asm/sysinfo.h> |
3a368f74 | 69 | #include <asm/numa.h> |
686140a1 | 70 | #include <asm/alternative.h> |
f19fbd5e | 71 | #include <asm/nospec-branch.h> |
8b646bd7 | 72 | #include "entry.h" |
c1821c2e | 73 | |
1da177e4 LT |
74 | /* |
75 | * Machine setup.. | |
76 | */ | |
77 | unsigned int console_mode = 0; | |
1485c5c8 HC |
78 | EXPORT_SYMBOL(console_mode); |
79 | ||
1da177e4 | 80 | unsigned int console_devno = -1; |
1485c5c8 HC |
81 | EXPORT_SYMBOL(console_devno); |
82 | ||
1da177e4 | 83 | unsigned int console_irq = -1; |
1485c5c8 HC |
84 | EXPORT_SYMBOL(console_irq); |
85 | ||
8f00b3e2 | 86 | unsigned long elf_hwcap __read_mostly = 0; |
cf8ba7a9 | 87 | char elf_platform[ELF_PLATFORM_SIZE]; |
36a2bd42 | 88 | |
7f16d7e7 DH |
89 | unsigned long int_hwcap = 0; |
90 | ||
23d75d9c HC |
91 | int __initdata memory_end_set; |
92 | unsigned long __initdata memory_end; | |
50be6345 | 93 | unsigned long __initdata max_physmem_end; |
1da177e4 | 94 | |
14045ebf MS |
95 | unsigned long VMALLOC_START; |
96 | EXPORT_SYMBOL(VMALLOC_START); | |
97 | ||
98 | unsigned long VMALLOC_END; | |
99 | EXPORT_SYMBOL(VMALLOC_END); | |
100 | ||
101 | struct page *vmemmap; | |
102 | EXPORT_SYMBOL(vmemmap); | |
103 | ||
c972cc60 HC |
104 | unsigned long MODULES_VADDR; |
105 | unsigned long MODULES_END; | |
c972cc60 | 106 | |
099b7651 | 107 | /* An array with a pointer to the lowcore of every CPU. */ |
c667aeac | 108 | struct lowcore *lowcore_ptr[NR_CPUS]; |
099b7651 FM |
109 | EXPORT_SYMBOL(lowcore_ptr); |
110 | ||
1da177e4 LT |
111 | /* |
112 | * This is set up by the setup-routine at boot-time | |
113 | * for S390 need to find out, what we have to setup | |
114 | * using address 0x10400 ... | |
115 | */ | |
116 | ||
117 | #include <asm/setup.h> | |
118 | ||
1da177e4 LT |
119 | /* |
120 | * condev= and conmode= setup parameter. | |
121 | */ | |
122 | ||
123 | static int __init condev_setup(char *str) | |
124 | { | |
125 | int vdev; | |
126 | ||
127 | vdev = simple_strtoul(str, &str, 0); | |
128 | if (vdev >= 0 && vdev < 65536) { | |
129 | console_devno = vdev; | |
130 | console_irq = -1; | |
131 | } | |
132 | return 1; | |
133 | } | |
134 | ||
135 | __setup("condev=", condev_setup); | |
136 | ||
637952ca HB |
137 | static void __init set_preferred_console(void) |
138 | { | |
8f50af49 | 139 | if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) |
637952ca | 140 | add_preferred_console("ttyS", 0, NULL); |
c4de0c1a | 141 | else if (CONSOLE_IS_3270) |
637952ca | 142 | add_preferred_console("tty3270", 0, NULL); |
8f50af49 PO |
143 | else if (CONSOLE_IS_VT220) |
144 | add_preferred_console("ttyS", 1, NULL); | |
145 | else if (CONSOLE_IS_HVC) | |
146 | add_preferred_console("hvc", 0, NULL); | |
637952ca HB |
147 | } |
148 | ||
1da177e4 LT |
149 | static int __init conmode_setup(char *str) |
150 | { | |
8c0933ee | 151 | #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
1da177e4 LT |
152 | if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) |
153 | SET_CONSOLE_SCLP; | |
154 | #endif | |
155 | #if defined(CONFIG_TN3215_CONSOLE) | |
156 | if (strncmp(str, "3215", 5) == 0) | |
157 | SET_CONSOLE_3215; | |
158 | #endif | |
159 | #if defined(CONFIG_TN3270_CONSOLE) | |
160 | if (strncmp(str, "3270", 5) == 0) | |
161 | SET_CONSOLE_3270; | |
162 | #endif | |
637952ca | 163 | set_preferred_console(); |
1da177e4 LT |
164 | return 1; |
165 | } | |
166 | ||
167 | __setup("conmode=", conmode_setup); | |
168 | ||
169 | static void __init conmode_default(void) | |
170 | { | |
171 | char query_buffer[1024]; | |
172 | char *ptr; | |
173 | ||
174 | if (MACHINE_IS_VM) { | |
740b5706 | 175 | cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); |
1da177e4 LT |
176 | console_devno = simple_strtoul(query_buffer + 5, NULL, 16); |
177 | ptr = strstr(query_buffer, "SUBCHANNEL ="); | |
178 | console_irq = simple_strtoul(ptr + 13, NULL, 16); | |
740b5706 | 179 | cpcmd("QUERY TERM", query_buffer, 1024, NULL); |
1da177e4 LT |
180 | ptr = strstr(query_buffer, "CONMODE"); |
181 | /* | |
182 | * Set the conmode to 3215 so that the device recognition | |
183 | * will set the cu_type of the console to 3215. If the | |
184 | * conmode is 3270 and we don't set it back then both | |
185 | * 3215 and the 3270 driver will try to access the console | |
186 | * device (3215 as console and 3270 as normal tty). | |
187 | */ | |
740b5706 | 188 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
1da177e4 | 189 | if (ptr == NULL) { |
8c0933ee | 190 | #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
1da177e4 LT |
191 | SET_CONSOLE_SCLP; |
192 | #endif | |
193 | return; | |
194 | } | |
195 | if (strncmp(ptr + 8, "3270", 4) == 0) { | |
196 | #if defined(CONFIG_TN3270_CONSOLE) | |
197 | SET_CONSOLE_3270; | |
198 | #elif defined(CONFIG_TN3215_CONSOLE) | |
199 | SET_CONSOLE_3215; | |
8c0933ee | 200 | #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
1da177e4 LT |
201 | SET_CONSOLE_SCLP; |
202 | #endif | |
203 | } else if (strncmp(ptr + 8, "3215", 4) == 0) { | |
204 | #if defined(CONFIG_TN3215_CONSOLE) | |
205 | SET_CONSOLE_3215; | |
206 | #elif defined(CONFIG_TN3270_CONSOLE) | |
207 | SET_CONSOLE_3270; | |
8c0933ee | 208 | #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
1da177e4 LT |
209 | SET_CONSOLE_SCLP; |
210 | #endif | |
211 | } | |
8f50af49 | 212 | } else if (MACHINE_IS_KVM) { |
a5ff1b34 | 213 | if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) |
8f50af49 | 214 | SET_CONSOLE_VT220; |
a5ff1b34 | 215 | else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) |
8f50af49 PO |
216 | SET_CONSOLE_SCLP; |
217 | else | |
218 | SET_CONSOLE_HVC; | |
1da177e4 | 219 | } else { |
8c0933ee | 220 | #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
1da177e4 LT |
221 | SET_CONSOLE_SCLP; |
222 | #endif | |
223 | } | |
579f1a28 FA |
224 | if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE)) |
225 | conswitchp = &dummy_con; | |
1da177e4 LT |
226 | } |
227 | ||
bf28a597 | 228 | #ifdef CONFIG_CRASH_DUMP |
fe72ffba | 229 | static void __init setup_zfcpdump(void) |
411ed322 | 230 | { |
411ed322 MH |
231 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
232 | return; | |
3f25dc4f MH |
233 | if (OLDMEM_BASE) |
234 | return; | |
fe72ffba | 235 | strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); |
411ed322 MH |
236 | console_loglevel = 2; |
237 | } | |
238 | #else | |
fe72ffba | 239 | static inline void setup_zfcpdump(void) {} |
bf28a597 | 240 | #endif /* CONFIG_CRASH_DUMP */ |
411ed322 | 241 | |
1da177e4 LT |
242 | /* |
243 | * Reboot, halt and power_off stubs. They just call _machine_restart, | |
244 | * _machine_halt or _machine_power_off. | |
245 | */ | |
246 | ||
247 | void machine_restart(char *command) | |
248 | { | |
7aa8dac7 | 249 | if ((!in_interrupt() && !in_atomic()) || oops_in_progress) |
06fa46a2 MS |
250 | /* |
251 | * Only unblank the console if we are called in enabled | |
252 | * context or a bust_spinlocks cleared the way for us. | |
253 | */ | |
254 | console_unblank(); | |
1da177e4 LT |
255 | _machine_restart(command); |
256 | } | |
257 | ||
1da177e4 LT |
258 | void machine_halt(void) |
259 | { | |
06fa46a2 MS |
260 | if (!in_interrupt() || oops_in_progress) |
261 | /* | |
262 | * Only unblank the console if we are called in enabled | |
263 | * context or a bust_spinlocks cleared the way for us. | |
264 | */ | |
265 | console_unblank(); | |
1da177e4 LT |
266 | _machine_halt(); |
267 | } | |
268 | ||
1da177e4 LT |
269 | void machine_power_off(void) |
270 | { | |
06fa46a2 MS |
271 | if (!in_interrupt() || oops_in_progress) |
272 | /* | |
273 | * Only unblank the console if we are called in enabled | |
274 | * context or a bust_spinlocks cleared the way for us. | |
275 | */ | |
276 | console_unblank(); | |
1da177e4 LT |
277 | _machine_power_off(); |
278 | } | |
279 | ||
53df751c MS |
280 | /* |
281 | * Dummy power off function. | |
282 | */ | |
283 | void (*pm_power_off)(void) = machine_power_off; | |
0872922f | 284 | EXPORT_SYMBOL_GPL(pm_power_off); |
53df751c | 285 | |
59685296 HC |
286 | static int __init early_parse_mem(char *p) |
287 | { | |
288 | memory_end = memparse(p, &p); | |
50be6345 | 289 | memory_end &= PAGE_MASK; |
23d75d9c | 290 | memory_end_set = 1; |
59685296 HC |
291 | return 0; |
292 | } | |
293 | early_param("mem", early_parse_mem); | |
294 | ||
14045ebf MS |
295 | static int __init parse_vmalloc(char *arg) |
296 | { | |
297 | if (!arg) | |
298 | return -EINVAL; | |
299 | VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; | |
300 | return 0; | |
301 | } | |
302 | early_param("vmalloc", parse_vmalloc); | |
303 | ||
72a9b02d | 304 | void *restart_stack __section(.data); |
8b646bd7 MS |
305 | |
306 | static void __init setup_lowcore(void) | |
c9e37353 | 307 | { |
c667aeac | 308 | struct lowcore *lc; |
c9e37353 HC |
309 | |
310 | /* | |
311 | * Setup lowcore for boot cpu | |
312 | */ | |
f1c1174f | 313 | BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); |
db7ad636 | 314 | lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc)); |
e258d719 | 315 | lc->restart_psw.mask = PSW_KERNEL_BITS; |
fecc868a | 316 | lc->restart_psw.addr = (unsigned long) restart_int_handler; |
e258d719 | 317 | lc->external_new_psw.mask = PSW_KERNEL_BITS | |
b50511e4 | 318 | PSW_MASK_DAT | PSW_MASK_MCHECK; |
fecc868a | 319 | lc->external_new_psw.addr = (unsigned long) ext_int_handler; |
e258d719 | 320 | lc->svc_new_psw.mask = PSW_KERNEL_BITS | |
b50511e4 | 321 | PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; |
fecc868a | 322 | lc->svc_new_psw.addr = (unsigned long) system_call; |
e258d719 | 323 | lc->program_new_psw.mask = PSW_KERNEL_BITS | |
b50511e4 | 324 | PSW_MASK_DAT | PSW_MASK_MCHECK; |
fecc868a | 325 | lc->program_new_psw.addr = (unsigned long) pgm_check_handler; |
e258d719 | 326 | lc->mcck_new_psw.mask = PSW_KERNEL_BITS; |
fecc868a | 327 | lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; |
e258d719 | 328 | lc->io_new_psw.mask = PSW_KERNEL_BITS | |
b50511e4 | 329 | PSW_MASK_DAT | PSW_MASK_MCHECK; |
fecc868a | 330 | lc->io_new_psw.addr = (unsigned long) io_int_handler; |
6e2ef5e4 | 331 | lc->clock_comparator = clock_comparator_max; |
dc7ee00d MS |
332 | lc->kernel_stack = ((unsigned long) &init_thread_union) |
333 | + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); | |
db7ad636 HC |
334 | lc->async_stack = (unsigned long) |
335 | memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE) | |
dc7ee00d | 336 | + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); |
db7ad636 HC |
337 | lc->panic_stack = (unsigned long) |
338 | memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE) | |
dc7ee00d | 339 | + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); |
d5c352cd | 340 | lc->current_task = (unsigned long)&init_task; |
8f100bb1 | 341 | lc->lpp = LPP_MAGIC; |
25097bf1 | 342 | lc->machine_flags = S390_lowcore.machine_flags; |
c360192b | 343 | lc->preempt_count = S390_lowcore.preempt_count; |
14375bc4 MS |
344 | lc->stfl_fac_list = S390_lowcore.stfl_fac_list; |
345 | memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, | |
cf148998 MS |
346 | sizeof(lc->stfle_fac_list)); |
347 | memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list, | |
348 | sizeof(lc->alt_stfle_fac_list)); | |
6c81511c | 349 | nmi_alloc_boot_cpu(lc); |
608796ff | 350 | vdso_alloc_boot_cpu(lc); |
ab96e798 MS |
351 | lc->sync_enter_timer = S390_lowcore.sync_enter_timer; |
352 | lc->async_enter_timer = S390_lowcore.async_enter_timer; | |
353 | lc->exit_timer = S390_lowcore.exit_timer; | |
354 | lc->user_timer = S390_lowcore.user_timer; | |
355 | lc->system_timer = S390_lowcore.system_timer; | |
356 | lc->steal_timer = S390_lowcore.steal_timer; | |
357 | lc->last_update_timer = S390_lowcore.last_update_timer; | |
358 | lc->last_update_clock = S390_lowcore.last_update_clock; | |
8b646bd7 | 359 | |
db7ad636 | 360 | restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE); |
8b646bd7 MS |
361 | restart_stack += ASYNC_SIZE; |
362 | ||
363 | /* | |
364 | * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant | |
b4a96015 | 365 | * restart data to the absolute zero lowcore. This is necessary if |
8b646bd7 MS |
366 | * PSW restart is done on an offline CPU that has lowcore zero. |
367 | */ | |
368 | lc->restart_stack = (unsigned long) restart_stack; | |
369 | lc->restart_fn = (unsigned long) do_restart; | |
370 | lc->restart_data = 0; | |
371 | lc->restart_source = -1UL; | |
73bf463e MH |
372 | |
373 | /* Setup absolute zero lowcore */ | |
fbe76568 HC |
374 | mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); |
375 | mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); | |
376 | mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); | |
377 | mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); | |
378 | mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); | |
8b646bd7 | 379 | |
6c8cd5bb PH |
380 | #ifdef CONFIG_SMP |
381 | lc->spinlock_lockval = arch_spin_lockval(0); | |
b96f7d88 MS |
382 | lc->spinlock_index = 0; |
383 | arch_spin_lock_setup(0); | |
6c8cd5bb | 384 | #endif |
f19fbd5e | 385 | lc->br_r1_trampoline = 0x07f1; /* br %r1 */ |
6c8cd5bb | 386 | |
c9e37353 | 387 | set_prefix((u32)(unsigned long) lc); |
099b7651 | 388 | lowcore_ptr[0] = lc; |
c9e37353 HC |
389 | } |
390 | ||
71189284 HC |
391 | static struct resource code_resource = { |
392 | .name = "Kernel code", | |
35d98e93 | 393 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
71189284 HC |
394 | }; |
395 | ||
396 | static struct resource data_resource = { | |
397 | .name = "Kernel data", | |
35d98e93 | 398 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
71189284 HC |
399 | }; |
400 | ||
4cc69531 HC |
401 | static struct resource bss_resource = { |
402 | .name = "Kernel bss", | |
35d98e93 | 403 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
4cc69531 HC |
404 | }; |
405 | ||
71189284 HC |
406 | static struct resource __initdata *standard_resources[] = { |
407 | &code_resource, | |
408 | &data_resource, | |
4cc69531 | 409 | &bss_resource, |
71189284 HC |
410 | }; |
411 | ||
412 | static void __init setup_resources(void) | |
c9e37353 | 413 | { |
71189284 | 414 | struct resource *res, *std_res, *sub_res; |
50be6345 PH |
415 | struct memblock_region *reg; |
416 | int j; | |
c9e37353 | 417 | |
320d9555 VG |
418 | code_resource.start = (unsigned long) _text; |
419 | code_resource.end = (unsigned long) _etext - 1; | |
420 | data_resource.start = (unsigned long) _etext; | |
421 | data_resource.end = (unsigned long) _edata - 1; | |
422 | bss_resource.start = (unsigned long) __bss_start; | |
423 | bss_resource.end = (unsigned long) __bss_stop - 1; | |
cc13ad62 | 424 | |
50be6345 | 425 | for_each_memblock(memory, reg) { |
db7ad636 | 426 | res = memblock_virt_alloc(sizeof(*res), 8); |
35d98e93 | 427 | res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; |
50be6345 PH |
428 | |
429 | res->name = "System RAM"; | |
430 | res->start = reg->base; | |
431 | res->end = reg->base + reg->size - 1; | |
c9e37353 | 432 | request_resource(&iomem_resource, res); |
fe355b7f | 433 | |
71189284 HC |
434 | for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { |
435 | std_res = standard_resources[j]; | |
436 | if (std_res->start < res->start || | |
437 | std_res->start > res->end) | |
438 | continue; | |
439 | if (std_res->end > res->end) { | |
db7ad636 | 440 | sub_res = memblock_virt_alloc(sizeof(*sub_res), 8); |
71189284 HC |
441 | *sub_res = *std_res; |
442 | sub_res->end = res->end; | |
443 | std_res->start = res->end + 1; | |
444 | request_resource(res, sub_res); | |
445 | } else { | |
446 | request_resource(res, std_res); | |
447 | } | |
fe355b7f | 448 | } |
c9e37353 | 449 | } |
4e042af4 HC |
450 | #ifdef CONFIG_CRASH_DUMP |
451 | /* | |
452 | * Re-add removed crash kernel memory as reserved memory. This makes | |
453 | * sure it will be mapped with the identity mapping and struct pages | |
454 | * will be created, so it can be resized later on. | |
455 | * However add it later since the crash kernel resource should not be | |
456 | * part of the System RAM resource. | |
457 | */ | |
458 | if (crashk_res.end) { | |
9f88eb4d | 459 | memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); |
4e042af4 HC |
460 | memblock_reserve(crashk_res.start, resource_size(&crashk_res)); |
461 | insert_resource(&iomem_resource, &crashk_res); | |
462 | } | |
463 | #endif | |
c9e37353 HC |
464 | } |
465 | ||
8b62bc96 HC |
466 | static void __init setup_memory_end(void) |
467 | { | |
14045ebf | 468 | unsigned long vmax, vmalloc_size, tmp; |
9f4b0ba8 | 469 | |
14045ebf | 470 | /* Choose kernel address space layout: 2, 3, or 4 levels. */ |
c972cc60 | 471 | vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; |
50be6345 | 472 | tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; |
242a112a | 473 | tmp = tmp * (sizeof(struct page) + PAGE_SIZE); |
f1c1174f HC |
474 | if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) |
475 | vmax = _REGION2_SIZE; /* 3-level kernel page table */ | |
14045ebf | 476 | else |
f1c1174f | 477 | vmax = _REGION1_SIZE; /* 4-level kernel page table */ |
c972cc60 HC |
478 | /* module area is at the end of the kernel address space. */ |
479 | MODULES_END = vmax; | |
480 | MODULES_VADDR = MODULES_END - MODULES_LEN; | |
481 | VMALLOC_END = MODULES_VADDR; | |
14045ebf MS |
482 | VMALLOC_START = vmax - vmalloc_size; |
483 | ||
484 | /* Split remaining virtual space between 1:1 mapping & vmemmap array */ | |
485 | tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); | |
a7bb1ae7 HC |
486 | /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ |
487 | tmp = SECTION_ALIGN_UP(tmp); | |
14045ebf MS |
488 | tmp = VMALLOC_START - tmp * sizeof(struct page); |
489 | tmp &= ~((vmax >> 11) - 1); /* align to page table level */ | |
490 | tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); | |
491 | vmemmap = (struct page *) tmp; | |
492 | ||
493 | /* Take care that memory_end is set and <= vmemmap */ | |
50be6345 PH |
494 | memory_end = min(memory_end ?: max_physmem_end, tmp); |
495 | max_pfn = max_low_pfn = PFN_DOWN(memory_end); | |
496 | memblock_remove(memory_end, ULONG_MAX); | |
8b62bc96 | 497 | |
6d7b2ee9 | 498 | pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); |
8b62bc96 HC |
499 | } |
500 | ||
60a0c68d MH |
501 | #ifdef CONFIG_CRASH_DUMP |
502 | ||
60a0c68d MH |
503 | /* |
504 | * When kdump is enabled, we have to ensure that no memory from | |
505 | * the area [0 - crashkernel memory size] and | |
506 | * [crashk_res.start - crashk_res.end] is set offline. | |
507 | */ | |
508 | static int kdump_mem_notifier(struct notifier_block *nb, | |
509 | unsigned long action, void *data) | |
510 | { | |
511 | struct memory_notify *arg = data; | |
512 | ||
bd858e84 MH |
513 | if (action != MEM_GOING_OFFLINE) |
514 | return NOTIFY_OK; | |
60a0c68d MH |
515 | if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) |
516 | return NOTIFY_BAD; | |
517 | if (arg->start_pfn > PFN_DOWN(crashk_res.end)) | |
518 | return NOTIFY_OK; | |
519 | if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) | |
520 | return NOTIFY_OK; | |
521 | return NOTIFY_BAD; | |
522 | } | |
523 | ||
524 | static struct notifier_block kdump_mem_nb = { | |
525 | .notifier_call = kdump_mem_notifier, | |
526 | }; | |
527 | ||
528 | #endif | |
529 | ||
50be6345 PH |
530 | /* |
531 | * Make sure that the area behind memory_end is protected | |
532 | */ | |
533 | static void reserve_memory_end(void) | |
534 | { | |
bf28a597 | 535 | #ifdef CONFIG_CRASH_DUMP |
50be6345 | 536 | if (ipl_info.type == IPL_TYPE_FCP_DUMP && |
37c5f6c8 DH |
537 | !OLDMEM_BASE && sclp.hsa_size) { |
538 | memory_end = sclp.hsa_size; | |
50be6345 PH |
539 | memory_end &= PAGE_MASK; |
540 | memory_end_set = 1; | |
541 | } | |
542 | #endif | |
543 | if (!memory_end_set) | |
544 | return; | |
545 | memblock_reserve(memory_end, ULONG_MAX); | |
546 | } | |
547 | ||
60a0c68d MH |
548 | /* |
549 | * Make sure that oldmem, where the dump is stored, is protected | |
550 | */ | |
551 | static void reserve_oldmem(void) | |
552 | { | |
553 | #ifdef CONFIG_CRASH_DUMP | |
50be6345 PH |
554 | if (OLDMEM_BASE) |
555 | /* Forget all memory above the running kdump system */ | |
556 | memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); | |
557 | #endif | |
558 | } | |
60a0c68d | 559 | |
50be6345 PH |
560 | /* |
561 | * Make sure that oldmem, where the dump is stored, is protected | |
562 | */ | |
563 | static void remove_oldmem(void) | |
564 | { | |
565 | #ifdef CONFIG_CRASH_DUMP | |
566 | if (OLDMEM_BASE) | |
567 | /* Forget all memory above the running kdump system */ | |
568 | memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); | |
60a0c68d MH |
569 | #endif |
570 | } | |
571 | ||
572 | /* | |
573 | * Reserve memory for kdump kernel to be loaded with kexec | |
574 | */ | |
575 | static void __init reserve_crashkernel(void) | |
576 | { | |
577 | #ifdef CONFIG_CRASH_DUMP | |
578 | unsigned long long crash_base, crash_size; | |
50be6345 | 579 | phys_addr_t low, high; |
60a0c68d MH |
580 | int rc; |
581 | ||
582 | rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, | |
583 | &crash_base); | |
50be6345 | 584 | |
dab7a7b1 MH |
585 | crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); |
586 | crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); | |
50be6345 | 587 | if (rc || crash_size == 0) |
60a0c68d | 588 | return; |
50be6345 PH |
589 | |
590 | if (memblock.memory.regions[0].size < crash_size) { | |
591 | pr_info("crashkernel reservation failed: %s\n", | |
592 | "first memory chunk must be at least crashkernel size"); | |
60a0c68d MH |
593 | return; |
594 | } | |
50be6345 PH |
595 | |
596 | low = crash_base ?: OLDMEM_BASE; | |
597 | high = low + crash_size; | |
598 | if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { | |
599 | /* The crashkernel fits into OLDMEM, reuse OLDMEM */ | |
600 | crash_base = low; | |
601 | } else { | |
602 | /* Find suitable area in free memory */ | |
37c5f6c8 | 603 | low = max_t(unsigned long, crash_size, sclp.hsa_size); |
50be6345 PH |
604 | high = crash_base ? crash_base + crash_size : ULONG_MAX; |
605 | ||
606 | if (crash_base && crash_base < low) { | |
607 | pr_info("crashkernel reservation failed: %s\n", | |
608 | "crash_base too low"); | |
609 | return; | |
610 | } | |
611 | low = crash_base ?: low; | |
612 | crash_base = memblock_find_in_range(low, high, crash_size, | |
613 | KEXEC_CRASH_MEM_ALIGN); | |
614 | } | |
615 | ||
616 | if (!crash_base) { | |
617 | pr_info("crashkernel reservation failed: %s\n", | |
618 | "no suitable area found"); | |
60a0c68d MH |
619 | return; |
620 | } | |
50be6345 PH |
621 | |
622 | if (register_memory_notifier(&kdump_mem_nb)) | |
623 | return; | |
624 | ||
60a0c68d MH |
625 | if (!OLDMEM_BASE && MACHINE_IS_VM) |
626 | diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); | |
627 | crashk_res.start = crash_base; | |
628 | crashk_res.end = crash_base + crash_size - 1; | |
50be6345 | 629 | memblock_remove(crash_base, crash_size); |
60a0c68d MH |
630 | pr_info("Reserving %lluMB of memory at %lluMB " |
631 | "for crashkernel (System RAM: %luMB)\n", | |
50be6345 PH |
632 | crash_size >> 20, crash_base >> 20, |
633 | (unsigned long)memblock.memory.total_size >> 20); | |
4857d4bb | 634 | os_info_crashkernel_add(crash_base, crash_size); |
60a0c68d MH |
635 | #endif |
636 | } | |
637 | ||
50be6345 PH |
638 | /* |
639 | * Reserve the initrd from being used by memblock | |
640 | */ | |
641 | static void __init reserve_initrd(void) | |
c9e37353 | 642 | { |
50be6345 | 643 | #ifdef CONFIG_BLK_DEV_INITRD |
7be5e359 HC |
644 | if (!INITRD_START || !INITRD_SIZE) |
645 | return; | |
50be6345 PH |
646 | initrd_start = INITRD_START; |
647 | initrd_end = initrd_start + INITRD_SIZE; | |
648 | memblock_reserve(INITRD_START, INITRD_SIZE); | |
649 | #endif | |
650 | } | |
1da177e4 | 651 | |
50be6345 PH |
652 | /* |
653 | * Check for initrd being in usable memory | |
654 | */ | |
655 | static void __init check_initrd(void) | |
656 | { | |
657 | #ifdef CONFIG_BLK_DEV_INITRD | |
658 | if (INITRD_START && INITRD_SIZE && | |
659 | !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { | |
6d7b2ee9 | 660 | pr_err("The initial RAM disk does not fit into the memory\n"); |
50be6345 PH |
661 | memblock_free(INITRD_START, INITRD_SIZE); |
662 | initrd_start = initrd_end = 0; | |
663 | } | |
664 | #endif | |
665 | } | |
666 | ||
667 | /* | |
0c36b8ac | 668 | * Reserve memory used for lowcore/command line/kernel image. |
50be6345 PH |
669 | */ |
670 | static void __init reserve_kernel(void) | |
671 | { | |
320d9555 | 672 | unsigned long start_pfn = PFN_UP(__pa(_end)); |
1da177e4 | 673 | |
0c36b8ac | 674 | #ifdef CONFIG_DMA_API_DEBUG |
65912a84 | 675 | /* |
0c36b8ac SO |
676 | * DMA_API_DEBUG code stumbles over addresses from the |
677 | * range [_ehead, _stext]. Mark the memory as reserved | |
678 | * so it is not used for CONFIG_DMA_API_DEBUG=y. | |
65912a84 | 679 | */ |
0c36b8ac SO |
680 | memblock_reserve(0, PFN_PHYS(start_pfn)); |
681 | #else | |
50be6345 PH |
682 | memblock_reserve(0, (unsigned long)_ehead); |
683 | memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) | |
684 | - (unsigned long)_stext); | |
0c36b8ac | 685 | #endif |
50be6345 | 686 | } |
65912a84 | 687 | |
50be6345 PH |
688 | static void __init setup_memory(void) |
689 | { | |
690 | struct memblock_region *reg; | |
1da177e4 LT |
691 | |
692 | /* | |
50be6345 | 693 | * Init storage key for present memory |
1da177e4 | 694 | */ |
50be6345 PH |
695 | for_each_memblock(memory, reg) { |
696 | storage_key_init_range(reg->base, reg->base + reg->size); | |
1da177e4 | 697 | } |
0b642ede PO |
698 | psw_set_key(PAGE_DEFAULT_KEY); |
699 | ||
50be6345 PH |
700 | /* Only cosmetics */ |
701 | memblock_enforce_memory_limit(memblock_end_of_DRAM()); | |
c9e37353 | 702 | } |
1da177e4 | 703 | |
cf8ba7a9 MS |
704 | /* |
705 | * Setup hardware capabilities. | |
706 | */ | |
89b1145e | 707 | static int __init setup_hwcaps(void) |
cf8ba7a9 MS |
708 | { |
709 | static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; | |
94038a99 | 710 | struct cpuid cpu_id; |
cf8ba7a9 MS |
711 | int i; |
712 | ||
cf8ba7a9 MS |
713 | /* |
714 | * The store facility list bits numbers as found in the principles | |
715 | * of operation are numbered with bit 1UL<<31 as number 0 to | |
716 | * bit 1UL<<0 as number 31. | |
717 | * Bit 0: instructions named N3, "backported" to esa-mode | |
718 | * Bit 2: z/Architecture mode is active | |
719 | * Bit 7: the store-facility-list-extended facility is installed | |
720 | * Bit 17: the message-security assist is installed | |
721 | * Bit 19: the long-displacement facility is installed | |
722 | * Bit 21: the extended-immediate facility is installed | |
488253ce AK |
723 | * Bit 22: extended-translation facility 3 is installed |
724 | * Bit 30: extended-translation facility 3 enhancement facility | |
cf8ba7a9 MS |
725 | * These get translated to: |
726 | * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, | |
727 | * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, | |
488253ce AK |
728 | * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and |
729 | * HWCAP_S390_ETF3EH bit 8 (22 && 30). | |
cf8ba7a9 MS |
730 | */ |
731 | for (i = 0; i < 6; i++) | |
14375bc4 | 732 | if (test_facility(stfl_bits[i])) |
cf8ba7a9 MS |
733 | elf_hwcap |= 1UL << i; |
734 | ||
14375bc4 | 735 | if (test_facility(22) && test_facility(30)) |
ea2a4d3a | 736 | elf_hwcap |= HWCAP_S390_ETF3EH; |
488253ce | 737 | |
cf8ba7a9 MS |
738 | /* |
739 | * Check for additional facilities with store-facility-list-extended. | |
740 | * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 | |
741 | * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information | |
742 | * as stored by stfl, bits 32-xxx contain additional facilities. | |
743 | * How many facility words are stored depends on the number of | |
25985edc | 744 | * doublewords passed to the instruction. The additional facilities |
cf8ba7a9 | 745 | * are: |
2ac3307f CE |
746 | * Bit 42: decimal floating point facility is installed |
747 | * Bit 44: perform floating point operation facility is installed | |
cf8ba7a9 | 748 | * translated to: |
488253ce | 749 | * HWCAP_S390_DFP bit 6 (42 && 44). |
cf8ba7a9 | 750 | */ |
14375bc4 MS |
751 | if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) |
752 | elf_hwcap |= HWCAP_S390_DFP; | |
cf8ba7a9 | 753 | |
ea2a4d3a HC |
754 | /* |
755 | * Huge page support HWCAP_S390_HPAGE is bit 7. | |
756 | */ | |
466178fc | 757 | if (MACHINE_HAS_EDAT1) |
ea2a4d3a HC |
758 | elf_hwcap |= HWCAP_S390_HPAGE; |
759 | ||
760 | /* | |
761 | * 64-bit register support for 31-bit processes | |
762 | * HWCAP_S390_HIGH_GPRS is bit 9. | |
763 | */ | |
764 | elf_hwcap |= HWCAP_S390_HIGH_GPRS; | |
d35339a4 MS |
765 | |
766 | /* | |
767 | * Transactional execution support HWCAP_S390_TE is bit 10. | |
768 | */ | |
baaf9be8 | 769 | if (MACHINE_HAS_TE) |
d35339a4 | 770 | elf_hwcap |= HWCAP_S390_TE; |
80703617 MS |
771 | |
772 | /* | |
89b1145e MS |
773 | * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension |
774 | * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX | |
775 | * instead of facility bit 129. | |
80703617 | 776 | */ |
2583b848 | 777 | if (MACHINE_HAS_VX) { |
80703617 | 778 | elf_hwcap |= HWCAP_S390_VXRS; |
2583b848 MS |
779 | if (test_facility(134)) |
780 | elf_hwcap |= HWCAP_S390_VXRS_EXT; | |
781 | if (test_facility(135)) | |
782 | elf_hwcap |= HWCAP_S390_VXRS_BCD; | |
783 | } | |
784 | ||
916cda1a MS |
785 | /* |
786 | * Guarded storage support HWCAP_S390_GS is bit 12. | |
787 | */ | |
788 | if (MACHINE_HAS_GS) | |
789 | elf_hwcap |= HWCAP_S390_GS; | |
790 | ||
94038a99 | 791 | get_cpu_id(&cpu_id); |
bcfcbb6b | 792 | add_device_randomness(&cpu_id, sizeof(cpu_id)); |
94038a99 | 793 | switch (cpu_id.machine) { |
cf8ba7a9 MS |
794 | case 0x2064: |
795 | case 0x2066: | |
cf8ba7a9 | 796 | default: /* Use "z900" as default for 64 bit kernels. */ |
cf8ba7a9 MS |
797 | strcpy(elf_platform, "z900"); |
798 | break; | |
799 | case 0x2084: | |
800 | case 0x2086: | |
801 | strcpy(elf_platform, "z990"); | |
802 | break; | |
803 | case 0x2094: | |
9fee8db2 | 804 | case 0x2096: |
cf8ba7a9 MS |
805 | strcpy(elf_platform, "z9-109"); |
806 | break; | |
9fee8db2 MS |
807 | case 0x2097: |
808 | case 0x2098: | |
809 | strcpy(elf_platform, "z10"); | |
810 | break; | |
c84b9051 | 811 | case 0x2817: |
3a81b171 | 812 | case 0x2818: |
c84b9051 HC |
813 | strcpy(elf_platform, "z196"); |
814 | break; | |
991c1505 | 815 | case 0x2827: |
59471227 | 816 | case 0x2828: |
991c1505 HC |
817 | strcpy(elf_platform, "zEC12"); |
818 | break; | |
f8b2dcbd | 819 | case 0x2964: |
bb3aa614 | 820 | case 0x2965: |
f8b2dcbd MS |
821 | strcpy(elf_platform, "z13"); |
822 | break; | |
6997c323 | 823 | case 0x3906: |
451239eb | 824 | case 0x3907: |
6997c323 MS |
825 | strcpy(elf_platform, "z14"); |
826 | break; | |
cf8ba7a9 | 827 | } |
7f16d7e7 DH |
828 | |
829 | /* | |
830 | * Virtualization support HWCAP_INT_SIE is bit 0. | |
831 | */ | |
832 | if (sclp.has_sief2) | |
833 | int_hwcap |= HWCAP_INT_SIE; | |
834 | ||
89b1145e | 835 | return 0; |
cf8ba7a9 | 836 | } |
89b1145e | 837 | arch_initcall(setup_hwcaps); |
cf8ba7a9 | 838 | |
bcfcbb6b MS |
839 | /* |
840 | * Add system information as device randomness | |
841 | */ | |
842 | static void __init setup_randomness(void) | |
843 | { | |
844 | struct sysinfo_3_2_2 *vmms; | |
845 | ||
da8fd820 HC |
846 | vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
847 | if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) | |
4920e3cf | 848 | add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); |
da8fd820 | 849 | memblock_free((unsigned long) vmms, PAGE_SIZE); |
bcfcbb6b MS |
850 | } |
851 | ||
3f6813b9 MS |
852 | /* |
853 | * Find the correct size for the task_struct. This depends on | |
854 | * the size of the struct fpu at the end of the thread_struct | |
855 | * which is embedded in the task_struct. | |
856 | */ | |
857 | static void __init setup_task_size(void) | |
858 | { | |
859 | int task_size = sizeof(struct task_struct); | |
860 | ||
861 | if (!MACHINE_HAS_VX) { | |
862 | task_size -= sizeof(__vector128) * __NUM_VXRS; | |
863 | task_size += sizeof(freg_t) * __NUM_FPRS; | |
864 | } | |
865 | arch_task_struct_size = task_size; | |
866 | } | |
867 | ||
c9e37353 HC |
868 | /* |
869 | * Setup function called from init/main.c just after the banner | |
870 | * was printed. | |
871 | */ | |
1da177e4 | 872 | |
8b646bd7 | 873 | void __init setup_arch(char **cmdline_p) |
c9e37353 | 874 | { |
1da177e4 | 875 | /* |
c9e37353 | 876 | * print what head.S has found out about the machine |
1da177e4 | 877 | */ |
fa587743 | 878 | if (MACHINE_IS_VM) |
3b6ed4ab MS |
879 | pr_info("Linux is running as a z/VM " |
880 | "guest operating system in 64-bit mode\n"); | |
637952ca | 881 | else if (MACHINE_IS_KVM) |
3b6ed4ab | 882 | pr_info("Linux is running under KVM in 64-bit mode\n"); |
27d71602 | 883 | else if (MACHINE_IS_LPAR) |
3b6ed4ab | 884 | pr_info("Linux is running natively in 64-bit mode\n"); |
c9e37353 | 885 | |
a0443fbb HB |
886 | /* Have one command line that is parsed and saved in /proc/cmdline */ |
887 | /* boot_command_line has been already set up in early.c */ | |
888 | *cmdline_p = boot_command_line; | |
59685296 | 889 | |
c9e37353 | 890 | ROOT_DEV = Root_RAM0; |
59685296 | 891 | |
50be6345 | 892 | /* Is init_mm really needed? */ |
59685296 | 893 | init_mm.start_code = PAGE_OFFSET; |
320d9555 VG |
894 | init_mm.end_code = (unsigned long) _etext; |
895 | init_mm.end_data = (unsigned long) _edata; | |
896 | init_mm.brk = (unsigned long) _end; | |
59685296 | 897 | |
6a3d1e81 MS |
898 | if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) |
899 | nospec_auto_detect(); | |
900 | ||
59685296 | 901 | parse_early_param(); |
8a07dd02 MS |
902 | #ifdef CONFIG_CRASH_DUMP |
903 | /* Deactivate elfcorehdr= kernel parameter */ | |
904 | elfcorehdr_addr = ELFCORE_ADDR_MAX; | |
905 | #endif | |
906 | ||
4857d4bb | 907 | os_info_init(); |
99ca4e58 | 908 | setup_ipl(); |
3f6813b9 | 909 | setup_task_size(); |
50be6345 PH |
910 | |
911 | /* Do some memory reservations *before* memory is added to memblock */ | |
912 | reserve_memory_end(); | |
67b5c3ee | 913 | reserve_oldmem(); |
50be6345 PH |
914 | reserve_kernel(); |
915 | reserve_initrd(); | |
50be6345 PH |
916 | memblock_allow_resize(); |
917 | ||
918 | /* Get information about *all* installed memory */ | |
919 | detect_memory_memblock(); | |
920 | ||
921 | remove_oldmem(); | |
922 | ||
923 | /* | |
924 | * Make sure all chunks are MAX_ORDER aligned so we don't need the | |
925 | * extra checks that HOLES_IN_ZONE would require. | |
926 | * | |
927 | * Is this still required? | |
928 | */ | |
929 | memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); | |
930 | ||
8b62bc96 | 931 | setup_memory_end(); |
c9e37353 | 932 | setup_memory(); |
e1231b0e | 933 | dma_contiguous_reserve(memory_end); |
3f429842 | 934 | vmcp_cma_reserve(); |
50be6345 PH |
935 | |
936 | check_initrd(); | |
937 | reserve_crashkernel(); | |
1a36a39e | 938 | #ifdef CONFIG_CRASH_DUMP |
1592a8e4 MH |
939 | /* |
940 | * Be aware that smp_save_dump_cpus() triggers a system reset. | |
941 | * Therefore CPU and device initialization should be done afterwards. | |
942 | */ | |
943 | smp_save_dump_cpus(); | |
1a36a39e | 944 | #endif |
50be6345 | 945 | |
c9e37353 HC |
946 | setup_resources(); |
947 | setup_lowcore(); | |
d80512f8 | 948 | smp_fill_possible_mask(); |
097a116c | 949 | cpu_detect_mhz_feature(); |
1da177e4 | 950 | cpu_init(); |
3a368f74 | 951 | numa_setup(); |
af51160e | 952 | smp_detect_cpus(); |
8c910580 | 953 | topology_init_early(); |
1da177e4 LT |
954 | |
955 | /* | |
956 | * Create kernel page tables and switch to virtual addressing. | |
957 | */ | |
958 | paging_init(); | |
959 | ||
960 | /* Setup default console */ | |
961 | conmode_default(); | |
637952ca | 962 | set_preferred_console(); |
411ed322 | 963 | |
686140a1 | 964 | apply_alternative_instructions(); |
f19fbd5e MS |
965 | if (IS_ENABLED(CONFIG_EXPOLINE)) |
966 | nospec_init_branches(); | |
686140a1 | 967 | |
411ed322 | 968 | /* Setup zfcpdump support */ |
fe72ffba | 969 | setup_zfcpdump(); |
bcfcbb6b MS |
970 | |
971 | /* Add system specific data to the random pool */ | |
972 | setup_randomness(); | |
1da177e4 | 973 | } |