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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * PARISC Architecture-dependent parts of process handling | |
4 | * based on the work for i386 | |
5 | * | |
6 | * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> | |
7 | * Copyright (C) 2000 Martin K Petersen <mkp at mkp.net> | |
8 | * Copyright (C) 2000 John Marvin <jsm at parisc-linux.org> | |
9 | * Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org> | |
10 | * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> | |
11 | * Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org> | |
12 | * Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com> | |
b2450cc1 | 13 | * Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org> |
1da177e4 LT |
14 | * Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> |
15 | * Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org> | |
16 | * Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> | |
9dabf60d | 17 | * Copyright (C) 2001-2014 Helge Deller <deller@gmx.de> |
1da177e4 | 18 | * Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> |
1da177e4 | 19 | */ |
1da177e4 LT |
20 | #include <linux/elf.h> |
21 | #include <linux/errno.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/mm.h> | |
4e950f6f | 24 | #include <linux/fs.h> |
310d8278 | 25 | #include <linux/cpu.h> |
1da177e4 LT |
26 | #include <linux/module.h> |
27 | #include <linux/personality.h> | |
28 | #include <linux/ptrace.h> | |
f4622fe4 | 29 | #include <linux/reboot.h> |
1da177e4 | 30 | #include <linux/sched.h> |
b17b0153 | 31 | #include <linux/sched/debug.h> |
29930025 | 32 | #include <linux/sched/task.h> |
68db0cf1 | 33 | #include <linux/sched/task_stack.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <linux/stddef.h> |
36 | #include <linux/unistd.h> | |
37 | #include <linux/kallsyms.h> | |
b609308e | 38 | #include <linux/uaccess.h> |
fbe75218 | 39 | #include <linux/rcupdate.h> |
9dabf60d | 40 | #include <linux/random.h> |
56188832 | 41 | #include <linux/nmi.h> |
98903688 | 42 | #include <linux/sched/hotplug.h> |
1da177e4 LT |
43 | |
44 | #include <asm/io.h> | |
0013a854 | 45 | #include <asm/asm-offsets.h> |
ff0ab8af | 46 | #include <asm/assembly.h> |
1da177e4 LT |
47 | #include <asm/pdc.h> |
48 | #include <asm/pdc_chassis.h> | |
1da177e4 | 49 | #include <asm/unwind.h> |
b609308e | 50 | #include <asm/sections.h> |
98903688 | 51 | #include <asm/cacheflush.h> |
1da177e4 | 52 | |
10992092 | 53 | #define COMMAND_GLOBAL F_EXTEND(0xfffe0030) |
1da177e4 LT |
54 | #define CMD_RESET 5 /* reset any module */ |
55 | ||
56 | /* | |
57 | ** The Wright Brothers and Gecko systems have a H/W problem | |
58 | ** (Lasi...'nuf said) may cause a broadcast reset to lockup | |
59 | ** the system. An HVERSION dependent PDC call was developed | |
60 | ** to perform a "safe", platform specific broadcast reset instead | |
61 | ** of kludging up all the code. | |
62 | ** | |
63 | ** Older machines which do not implement PDC_BROADCAST_RESET will | |
64 | ** return (with an error) and the regular broadcast reset can be | |
65 | ** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET | |
66 | ** the PDC call will not return (the system will be reset). | |
67 | */ | |
68 | void machine_restart(char *cmd) | |
69 | { | |
70 | #ifdef FASTBOOT_SELFTEST_SUPPORT | |
71 | /* | |
72 | ** If user has modified the Firmware Selftest Bitmap, | |
73 | ** run the tests specified in the bitmap after the | |
74 | ** system is rebooted w/PDC_DO_RESET. | |
75 | ** | |
76 | ** ftc_bitmap = 0x1AUL "Skip destructive memory tests" | |
77 | ** | |
78 | ** Using "directed resets" at each processor with the MEM_TOC | |
79 | ** vector cleared will also avoid running destructive | |
80 | ** memory self tests. (Not implemented yet) | |
81 | */ | |
82 | if (ftc_bitmap) { | |
83 | pdc_do_firm_test_reset(ftc_bitmap); | |
84 | } | |
85 | #endif | |
86 | /* set up a new led state on systems shipped with a LED State panel */ | |
87 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
88 | ||
89 | /* "Normal" system reset */ | |
90 | pdc_do_reset(); | |
91 | ||
92 | /* Nope...box should reset with just CMD_RESET now */ | |
93 | gsc_writel(CMD_RESET, COMMAND_GLOBAL); | |
94 | ||
95 | /* Wait for RESET to lay us to rest. */ | |
96 | while (1) ; | |
97 | ||
98 | } | |
99 | ||
85509c00 | 100 | void (*chassis_power_off)(void); |
1da177e4 LT |
101 | |
102 | /* | |
103 | * This routine is called from sys_reboot to actually turn off the | |
104 | * machine | |
105 | */ | |
106 | void machine_power_off(void) | |
107 | { | |
108 | /* If there is a registered power off handler, call it. */ | |
85509c00 KM |
109 | if (chassis_power_off) |
110 | chassis_power_off(); | |
1da177e4 LT |
111 | |
112 | /* Put the soft power button back under hardware control. | |
113 | * If the user had already pressed the power button, the | |
114 | * following call will immediately power off. */ | |
115 | pdc_soft_power_button(0); | |
116 | ||
117 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
24002d59 HD |
118 | |
119 | /* ipmi_poweroff may have been installed. */ | |
f4622fe4 | 120 | do_kernel_power_off(); |
1da177e4 LT |
121 | |
122 | /* It seems we have no way to power the system off via | |
123 | * software. The user has to press the button himself. */ | |
124 | ||
125 | printk(KERN_EMERG "System shut down completed.\n" | |
ad361c98 | 126 | "Please power this system off now."); |
73580dac | 127 | |
476e75a4 HD |
128 | /* prevent soft lockup/stalled CPU messages for endless loop. */ |
129 | rcu_sysrq_start(); | |
47bb4baf | 130 | lockup_detector_soft_poweroff(); |
73580dac | 131 | for (;;); |
1da177e4 LT |
132 | } |
133 | ||
24002d59 | 134 | void (*pm_power_off)(void); |
85509c00 | 135 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 | 136 | |
67698287 HD |
137 | void machine_halt(void) |
138 | { | |
139 | machine_power_off(); | |
140 | } | |
141 | ||
1da177e4 LT |
142 | void flush_thread(void) |
143 | { | |
144 | /* Only needs to handle fpu stuff or perf monitors. | |
145 | ** REVISIT: several arches implement a "lazy fpu state". | |
146 | */ | |
1da177e4 LT |
147 | } |
148 | ||
149 | void release_thread(struct task_struct *dead_task) | |
150 | { | |
151 | } | |
152 | ||
310d8278 HD |
153 | /* |
154 | * Idle thread support | |
155 | * | |
156 | * Detect when running on QEMU with SeaBIOS PDC Firmware and let | |
157 | * QEMU idle the host too. | |
158 | */ | |
159 | ||
7e4c65bf | 160 | int running_on_qemu __ro_after_init; |
3e1120f4 | 161 | EXPORT_SYMBOL(running_on_qemu); |
310d8278 | 162 | |
98903688 HD |
163 | /* |
164 | * Called from the idle thread for the CPU which has been shutdown. | |
165 | */ | |
166 | void arch_cpu_idle_dead(void) | |
310d8278 | 167 | { |
98903688 HD |
168 | #ifdef CONFIG_HOTPLUG_CPU |
169 | idle_task_exit(); | |
170 | ||
171 | local_irq_disable(); | |
172 | ||
173 | /* Tell __cpu_die() that this CPU is now safe to dispose of. */ | |
174 | (void)cpu_report_death(); | |
175 | ||
176 | /* Ensure that the cache lines are written out. */ | |
177 | flush_cache_all_local(); | |
178 | flush_tlb_all_local(NULL); | |
179 | ||
180 | /* Let PDC firmware put CPU into firmware idle loop. */ | |
181 | __pdc_cpu_rendezvous(); | |
182 | ||
183 | pr_warn("PDC does not provide rendezvous function.\n"); | |
184 | #endif | |
185 | while (1); | |
310d8278 HD |
186 | } |
187 | ||
188 | void __cpuidle arch_cpu_idle(void) | |
189 | { | |
58c644ba | 190 | raw_local_irq_enable(); |
310d8278 HD |
191 | |
192 | /* nop on real hardware, qemu will idle sleep. */ | |
193 | asm volatile("or %%r10,%%r10,%%r10\n":::); | |
194 | } | |
195 | ||
196 | static int __init parisc_idle_init(void) | |
197 | { | |
310d8278 HD |
198 | if (!running_on_qemu) |
199 | cpu_idle_poll_ctrl(1); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | arch_initcall(parisc_idle_init); | |
204 | ||
5fec97d0 AD |
205 | /* |
206 | * Copy architecture-specific thread state | |
207 | */ | |
1da177e4 | 208 | int |
c5febea0 | 209 | copy_thread(struct task_struct *p, const struct kernel_clone_args *args) |
1da177e4 | 210 | { |
c5febea0 EB |
211 | unsigned long clone_flags = args->flags; |
212 | unsigned long usp = args->stack; | |
c5febea0 | 213 | unsigned long tls = args->tls; |
afa86fc4 | 214 | struct pt_regs *cregs = &(p->thread.regs); |
40f1f0de | 215 | void *stack = task_stack_page(p); |
1da177e4 LT |
216 | |
217 | /* We have to use void * instead of a function pointer, because | |
218 | * function pointers aren't a pointer to the function on 64-bit. | |
219 | * Make them const so the compiler knows they live in .text */ | |
220 | extern void * const ret_from_kernel_thread; | |
221 | extern void * const child_return; | |
c78c2b7e | 222 | |
5bd2e97c | 223 | if (unlikely(args->fn)) { |
5fec97d0 | 224 | /* kernel thread */ |
a44e060f | 225 | memset(cregs, 0, sizeof(struct pt_regs)); |
36cb0e1c | 226 | if (args->idle) /* idle thread */ |
ff0ab8af | 227 | return 0; |
1da177e4 LT |
228 | /* Must exit via ret_from_kernel_thread in order |
229 | * to call schedule_tail() | |
230 | */ | |
2214c0e7 | 231 | cregs->ksp = (unsigned long) stack + FRAME_SIZE + PT_SZ_ALGN; |
1da177e4 LT |
232 | cregs->kpc = (unsigned long) &ret_from_kernel_thread; |
233 | /* | |
234 | * Copy function and argument to be called from | |
235 | * ret_from_kernel_thread. | |
236 | */ | |
a8f44e38 | 237 | #ifdef CONFIG_64BIT |
5bd2e97c EB |
238 | cregs->gr[27] = ((unsigned long *)args->fn)[3]; |
239 | cregs->gr[26] = ((unsigned long *)args->fn)[2]; | |
a44e060f | 240 | #else |
5bd2e97c | 241 | cregs->gr[26] = (unsigned long) args->fn; |
1da177e4 | 242 | #endif |
5bd2e97c | 243 | cregs->gr[25] = (unsigned long) args->fn_arg; |
1da177e4 LT |
244 | } else { |
245 | /* user thread */ | |
415bfae9 AV |
246 | /* usp must be word aligned. This also prevents users from |
247 | * passing in the value 1 (which is the signal for a special | |
248 | * return for a kernel thread) */ | |
249 | if (usp) { | |
250 | usp = ALIGN(usp, 4); | |
251 | if (likely(usp)) | |
252 | cregs->gr[30] = usp; | |
253 | } | |
2214c0e7 | 254 | cregs->ksp = (unsigned long) stack + FRAME_SIZE; |
c78c2b7e HD |
255 | cregs->kpc = (unsigned long) &child_return; |
256 | ||
d2f36c78 | 257 | /* Setup thread TLS area */ |
b2450cc1 | 258 | if (clone_flags & CLONE_SETTLS) |
d2f36c78 | 259 | cregs->cr27 = tls; |
1da177e4 LT |
260 | } |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
3db03b4a | 265 | unsigned long |
42a20f86 | 266 | __get_wchan(struct task_struct *p) |
1da177e4 LT |
267 | { |
268 | struct unwind_frame_info info; | |
269 | unsigned long ip; | |
270 | int count = 0; | |
cc650a7a | 271 | |
1da177e4 LT |
272 | /* |
273 | * These bracket the sleeping functions.. | |
274 | */ | |
275 | ||
276 | unwind_frame_init_from_blocked_task(&info, p); | |
277 | do { | |
278 | if (unwind_once(&info) < 0) | |
279 | return 0; | |
b03fbd4f | 280 | if (task_is_running(p)) |
f2863032 | 281 | return 0; |
1da177e4 LT |
282 | ip = info.ip; |
283 | if (!in_sched_functions(ip)) | |
284 | return ip; | |
c8921d72 | 285 | } while (count++ < MAX_UNWIND_ENTRIES); |
1da177e4 LT |
286 | return 0; |
287 | } | |
b609308e | 288 | |
9dabf60d HD |
289 | static inline unsigned long brk_rnd(void) |
290 | { | |
a251c17a | 291 | return (get_random_u32() & BRK_RND_MASK) << PAGE_SHIFT; |
9dabf60d HD |
292 | } |
293 | ||
294 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
295 | { | |
296 | unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd()); | |
297 | ||
298 | if (ret < mm->brk) | |
299 | return mm->brk; | |
300 | return ret; | |
301 | } |