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1da177e4 LT |
1 | /* |
2 | * PARISC Architecture-dependent parts of process handling | |
3 | * based on the work for i386 | |
4 | * | |
5 | * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> | |
6 | * Copyright (C) 2000 Martin K Petersen <mkp at mkp.net> | |
7 | * Copyright (C) 2000 John Marvin <jsm at parisc-linux.org> | |
8 | * Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org> | |
9 | * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> | |
10 | * Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org> | |
11 | * Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com> | |
b2450cc1 | 12 | * Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org> |
1da177e4 LT |
13 | * Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> |
14 | * Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org> | |
15 | * Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> | |
9dabf60d | 16 | * Copyright (C) 2001-2014 Helge Deller <deller@gmx.de> |
1da177e4 LT |
17 | * Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> |
18 | * | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation; either version 2 of the License, or | |
23 | * (at your option) any later version. | |
24 | * | |
25 | * This program is distributed in the hope that it will be useful, | |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | * GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with this program; if not, write to the Free Software | |
32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
33 | */ | |
34 | ||
35 | #include <stdarg.h> | |
36 | ||
37 | #include <linux/elf.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/mm.h> | |
4e950f6f | 41 | #include <linux/fs.h> |
310d8278 | 42 | #include <linux/cpu.h> |
1da177e4 LT |
43 | #include <linux/module.h> |
44 | #include <linux/personality.h> | |
45 | #include <linux/ptrace.h> | |
46 | #include <linux/sched.h> | |
b17b0153 | 47 | #include <linux/sched/debug.h> |
29930025 | 48 | #include <linux/sched/task.h> |
68db0cf1 | 49 | #include <linux/sched/task_stack.h> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
1da177e4 LT |
51 | #include <linux/stddef.h> |
52 | #include <linux/unistd.h> | |
53 | #include <linux/kallsyms.h> | |
b609308e | 54 | #include <linux/uaccess.h> |
fbe75218 | 55 | #include <linux/rcupdate.h> |
9dabf60d | 56 | #include <linux/random.h> |
56188832 | 57 | #include <linux/nmi.h> |
1da177e4 LT |
58 | |
59 | #include <asm/io.h> | |
0013a854 | 60 | #include <asm/asm-offsets.h> |
ff0ab8af | 61 | #include <asm/assembly.h> |
1da177e4 LT |
62 | #include <asm/pdc.h> |
63 | #include <asm/pdc_chassis.h> | |
64 | #include <asm/pgalloc.h> | |
1da177e4 | 65 | #include <asm/unwind.h> |
b609308e | 66 | #include <asm/sections.h> |
1da177e4 | 67 | |
10992092 | 68 | #define COMMAND_GLOBAL F_EXTEND(0xfffe0030) |
1da177e4 LT |
69 | #define CMD_RESET 5 /* reset any module */ |
70 | ||
71 | /* | |
72 | ** The Wright Brothers and Gecko systems have a H/W problem | |
73 | ** (Lasi...'nuf said) may cause a broadcast reset to lockup | |
74 | ** the system. An HVERSION dependent PDC call was developed | |
75 | ** to perform a "safe", platform specific broadcast reset instead | |
76 | ** of kludging up all the code. | |
77 | ** | |
78 | ** Older machines which do not implement PDC_BROADCAST_RESET will | |
79 | ** return (with an error) and the regular broadcast reset can be | |
80 | ** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET | |
81 | ** the PDC call will not return (the system will be reset). | |
82 | */ | |
83 | void machine_restart(char *cmd) | |
84 | { | |
85 | #ifdef FASTBOOT_SELFTEST_SUPPORT | |
86 | /* | |
87 | ** If user has modified the Firmware Selftest Bitmap, | |
88 | ** run the tests specified in the bitmap after the | |
89 | ** system is rebooted w/PDC_DO_RESET. | |
90 | ** | |
91 | ** ftc_bitmap = 0x1AUL "Skip destructive memory tests" | |
92 | ** | |
93 | ** Using "directed resets" at each processor with the MEM_TOC | |
94 | ** vector cleared will also avoid running destructive | |
95 | ** memory self tests. (Not implemented yet) | |
96 | */ | |
97 | if (ftc_bitmap) { | |
98 | pdc_do_firm_test_reset(ftc_bitmap); | |
99 | } | |
100 | #endif | |
101 | /* set up a new led state on systems shipped with a LED State panel */ | |
102 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
103 | ||
104 | /* "Normal" system reset */ | |
105 | pdc_do_reset(); | |
106 | ||
107 | /* Nope...box should reset with just CMD_RESET now */ | |
108 | gsc_writel(CMD_RESET, COMMAND_GLOBAL); | |
109 | ||
110 | /* Wait for RESET to lay us to rest. */ | |
111 | while (1) ; | |
112 | ||
113 | } | |
114 | ||
1da177e4 LT |
115 | void machine_halt(void) |
116 | { | |
117 | /* | |
118 | ** The LED/ChassisCodes are updated by the led_halt() | |
119 | ** function, called by the reboot notifier chain. | |
120 | */ | |
121 | } | |
122 | ||
85509c00 | 123 | void (*chassis_power_off)(void); |
1da177e4 LT |
124 | |
125 | /* | |
126 | * This routine is called from sys_reboot to actually turn off the | |
127 | * machine | |
128 | */ | |
129 | void machine_power_off(void) | |
130 | { | |
131 | /* If there is a registered power off handler, call it. */ | |
85509c00 KM |
132 | if (chassis_power_off) |
133 | chassis_power_off(); | |
1da177e4 LT |
134 | |
135 | /* Put the soft power button back under hardware control. | |
136 | * If the user had already pressed the power button, the | |
137 | * following call will immediately power off. */ | |
138 | pdc_soft_power_button(0); | |
139 | ||
140 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
141 | ||
142 | /* It seems we have no way to power the system off via | |
143 | * software. The user has to press the button himself. */ | |
144 | ||
145 | printk(KERN_EMERG "System shut down completed.\n" | |
ad361c98 | 146 | "Please power this system off now."); |
73580dac | 147 | |
476e75a4 HD |
148 | /* prevent soft lockup/stalled CPU messages for endless loop. */ |
149 | rcu_sysrq_start(); | |
47bb4baf | 150 | lockup_detector_soft_poweroff(); |
73580dac | 151 | for (;;); |
1da177e4 LT |
152 | } |
153 | ||
85509c00 KM |
154 | void (*pm_power_off)(void) = machine_power_off; |
155 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 | 156 | |
1da177e4 LT |
157 | void flush_thread(void) |
158 | { | |
159 | /* Only needs to handle fpu stuff or perf monitors. | |
160 | ** REVISIT: several arches implement a "lazy fpu state". | |
161 | */ | |
1da177e4 LT |
162 | } |
163 | ||
164 | void release_thread(struct task_struct *dead_task) | |
165 | { | |
166 | } | |
167 | ||
168 | /* | |
169 | * Fill in the FPU structure for a core dump. | |
170 | */ | |
171 | ||
172 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r) | |
173 | { | |
174 | if (regs == NULL) | |
175 | return 0; | |
176 | ||
177 | memcpy(r, regs->fr, sizeof *r); | |
178 | return 1; | |
179 | } | |
180 | ||
181 | int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r) | |
182 | { | |
183 | memcpy(r, tsk->thread.regs.fr, sizeof(*r)); | |
184 | return 1; | |
185 | } | |
186 | ||
310d8278 HD |
187 | /* |
188 | * Idle thread support | |
189 | * | |
190 | * Detect when running on QEMU with SeaBIOS PDC Firmware and let | |
191 | * QEMU idle the host too. | |
192 | */ | |
193 | ||
194 | int running_on_qemu __read_mostly; | |
195 | ||
196 | void __cpuidle arch_cpu_idle_dead(void) | |
197 | { | |
198 | /* nop on real hardware, qemu will offline CPU. */ | |
199 | asm volatile("or %%r31,%%r31,%%r31\n":::); | |
200 | } | |
201 | ||
202 | void __cpuidle arch_cpu_idle(void) | |
203 | { | |
204 | local_irq_enable(); | |
205 | ||
206 | /* nop on real hardware, qemu will idle sleep. */ | |
207 | asm volatile("or %%r10,%%r10,%%r10\n":::); | |
208 | } | |
209 | ||
210 | static int __init parisc_idle_init(void) | |
211 | { | |
310d8278 HD |
212 | if (!running_on_qemu) |
213 | cpu_idle_poll_ctrl(1); | |
214 | ||
215 | return 0; | |
216 | } | |
217 | arch_initcall(parisc_idle_init); | |
218 | ||
5fec97d0 AD |
219 | /* |
220 | * Copy architecture-specific thread state | |
221 | */ | |
1da177e4 | 222 | int |
6f2c55b8 | 223 | copy_thread(unsigned long clone_flags, unsigned long usp, |
5fec97d0 | 224 | unsigned long kthread_arg, struct task_struct *p) |
1da177e4 | 225 | { |
afa86fc4 | 226 | struct pt_regs *cregs = &(p->thread.regs); |
40f1f0de | 227 | void *stack = task_stack_page(p); |
1da177e4 LT |
228 | |
229 | /* We have to use void * instead of a function pointer, because | |
230 | * function pointers aren't a pointer to the function on 64-bit. | |
231 | * Make them const so the compiler knows they live in .text */ | |
232 | extern void * const ret_from_kernel_thread; | |
233 | extern void * const child_return; | |
c78c2b7e | 234 | |
ff0ab8af | 235 | if (unlikely(p->flags & PF_KTHREAD)) { |
5fec97d0 | 236 | /* kernel thread */ |
a44e060f | 237 | memset(cregs, 0, sizeof(struct pt_regs)); |
ff0ab8af AV |
238 | if (!usp) /* idle thread */ |
239 | return 0; | |
1da177e4 LT |
240 | /* Must exit via ret_from_kernel_thread in order |
241 | * to call schedule_tail() | |
242 | */ | |
ff0ab8af | 243 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; |
1da177e4 LT |
244 | cregs->kpc = (unsigned long) &ret_from_kernel_thread; |
245 | /* | |
246 | * Copy function and argument to be called from | |
247 | * ret_from_kernel_thread. | |
248 | */ | |
a8f44e38 | 249 | #ifdef CONFIG_64BIT |
a44e060f AV |
250 | cregs->gr[27] = ((unsigned long *)usp)[3]; |
251 | cregs->gr[26] = ((unsigned long *)usp)[2]; | |
252 | #else | |
253 | cregs->gr[26] = usp; | |
1da177e4 | 254 | #endif |
5fec97d0 | 255 | cregs->gr[25] = kthread_arg; |
1da177e4 LT |
256 | } else { |
257 | /* user thread */ | |
415bfae9 AV |
258 | /* usp must be word aligned. This also prevents users from |
259 | * passing in the value 1 (which is the signal for a special | |
260 | * return for a kernel thread) */ | |
261 | if (usp) { | |
262 | usp = ALIGN(usp, 4); | |
263 | if (likely(usp)) | |
264 | cregs->gr[30] = usp; | |
265 | } | |
ff0ab8af | 266 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; |
c78c2b7e HD |
267 | cregs->kpc = (unsigned long) &child_return; |
268 | ||
b2450cc1 CD |
269 | /* Setup thread TLS area from the 4th parameter in clone */ |
270 | if (clone_flags & CLONE_SETTLS) | |
415bfae9 | 271 | cregs->cr27 = cregs->gr[23]; |
1da177e4 LT |
272 | } |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
3db03b4a | 277 | unsigned long |
1da177e4 LT |
278 | get_wchan(struct task_struct *p) |
279 | { | |
280 | struct unwind_frame_info info; | |
281 | unsigned long ip; | |
282 | int count = 0; | |
cc650a7a KM |
283 | |
284 | if (!p || p == current || p->state == TASK_RUNNING) | |
285 | return 0; | |
286 | ||
1da177e4 LT |
287 | /* |
288 | * These bracket the sleeping functions.. | |
289 | */ | |
290 | ||
291 | unwind_frame_init_from_blocked_task(&info, p); | |
292 | do { | |
293 | if (unwind_once(&info) < 0) | |
294 | return 0; | |
295 | ip = info.ip; | |
296 | if (!in_sched_functions(ip)) | |
297 | return ip; | |
298 | } while (count++ < 16); | |
299 | return 0; | |
300 | } | |
b609308e KM |
301 | |
302 | #ifdef CONFIG_64BIT | |
303 | void *dereference_function_descriptor(void *ptr) | |
304 | { | |
305 | Elf64_Fdesc *desc = ptr; | |
306 | void *p; | |
307 | ||
308 | if (!probe_kernel_address(&desc->addr, p)) | |
309 | ptr = p; | |
310 | return ptr; | |
311 | } | |
312 | #endif | |
9dabf60d HD |
313 | |
314 | static inline unsigned long brk_rnd(void) | |
315 | { | |
18d98a79 | 316 | return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT; |
9dabf60d HD |
317 | } |
318 | ||
319 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
320 | { | |
321 | unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd()); | |
322 | ||
323 | if (ret < mm->brk) | |
324 | return mm->brk; | |
325 | return ret; | |
326 | } |