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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284// SPDX-License-Identifier: GPL-2.0-or-later/* * PARISC Architecture-dependent parts of process handling * based on the work for i386 * * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> * Copyright (C) 2000 Martin K Petersen <mkp at mkp.net> * Copyright (C) 2000 John Marvin <jsm at parisc-linux.org> * Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org> * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> * Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org> * Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com> * Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org> * Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> * Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org> * Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> * Copyright (C) 2001-2014 Helge Deller <deller@gmx.de> * Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> */#include <linux/elf.h>#include <linux/errno.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/fs.h>#include <linux/cpu.h>#include <linux/module.h>#include <linux/personality.h>#include <linux/ptrace.h>#include <linux/reboot.h>#include <linux/sched.h>#include <linux/sched/debug.h>#include <linux/sched/task.h>#include <linux/sched/task_stack.h>#include <linux/slab.h>#include <linux/stddef.h>#include <linux/unistd.h>#include <linux/kallsyms.h>#include <linux/uaccess.h>#include <linux/rcupdate.h>#include <linux/random.h>#include <linux/nmi.h>#include <linux/sched/hotplug.h>
#include <asm/io.h>#include <asm/asm-offsets.h>#include <asm/assembly.h>#include <asm/pdc.h>#include <asm/pdc_chassis.h>#include <asm/unwind.h>#include <asm/sections.h>#include <asm/cacheflush.h>
#define COMMAND_GLOBAL F_EXTEND(0xfffe0030)#define CMD_RESET 5 /* reset any module */
/*** The Wright Brothers and Gecko systems have a H/W problem** (Lasi...'nuf said) may cause a broadcast reset to lockup** the system. An HVERSION dependent PDC call was developed** to perform a "safe", platform specific broadcast reset instead** of kludging up all the code.**** Older machines which do not implement PDC_BROADCAST_RESET will** return (with an error) and the regular broadcast reset can be** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET** the PDC call will not return (the system will be reset).*/void machine_restart(char *cmd){#ifdef FASTBOOT_SELFTEST_SUPPORT /* ** If user has modified the Firmware Selftest Bitmap, ** run the tests specified in the bitmap after the ** system is rebooted w/PDC_DO_RESET. ** ** ftc_bitmap = 0x1AUL "Skip destructive memory tests" ** ** Using "directed resets" at each processor with the MEM_TOC ** vector cleared will also avoid running destructive ** memory self tests. (Not implemented yet) */ if (ftc_bitmap) { pdc_do_firm_test_reset(ftc_bitmap); }#endif /* set up a new led state on systems shipped with a LED State panel */ pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
/* prevent interrupts during reboot */ set_eiem(0); /* "Normal" system reset */ pdc_do_reset();
/* Nope...box should reset with just CMD_RESET now */ gsc_writel(CMD_RESET, COMMAND_GLOBAL);
/* Wait for RESET to lay us to rest. */ while (1) ;
}
/* * This routine is called from sys_reboot to actually turn off the * machine */void machine_power_off(void){ /* Put the soft power button back under hardware control. * If the user had already pressed the power button, the * following call will immediately power off. */ pdc_soft_power_button(0); pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
/* ipmi_poweroff may have been installed. */ do_kernel_power_off(); /* It seems we have no way to power the system off via * software. The user has to press the button himself. */
printk("Power off or press RETURN to reboot.\n");
/* prevent soft lockup/stalled CPU messages for endless loop. */ rcu_sysrq_start(); lockup_detector_soft_poweroff(); while (1) { /* reboot if user presses RETURN key */ if (pdc_iodc_getc() == 13) { printk("Rebooting...\n"); machine_restart(NULL); } }}
void (*pm_power_off)(void);EXPORT_SYMBOL(pm_power_off);
void machine_halt(void){ machine_power_off();}
void flush_thread(void){ /* Only needs to handle fpu stuff or perf monitors. ** REVISIT: several arches implement a "lazy fpu state". */}
/* * Idle thread support * * Detect when running on QEMU with SeaBIOS PDC Firmware and let * QEMU idle the host too. */
int running_on_qemu __ro_after_init;EXPORT_SYMBOL(running_on_qemu);
/* * Called from the idle thread for the CPU which has been shutdown. */void __noreturn arch_cpu_idle_dead(void){#ifdef CONFIG_HOTPLUG_CPU idle_task_exit();
local_irq_disable();
/* Tell the core that this CPU is now safe to dispose of. */ cpuhp_ap_report_dead();
/* Ensure that the cache lines are written out. */ flush_cache_all_local(); flush_tlb_all_local(NULL);
/* Let PDC firmware put CPU into firmware idle loop. */ __pdc_cpu_rendezvous();
pr_warn("PDC does not provide rendezvous function.\n");#endif while (1);}
void __cpuidle arch_cpu_idle(void){ /* nop on real hardware, qemu will idle sleep. */ asm volatile("or %%r10,%%r10,%%r10\n":::);}
static int __init parisc_idle_init(void){ if (!running_on_qemu) cpu_idle_poll_ctrl(1);
return 0;}arch_initcall(parisc_idle_init);
/* * Copy architecture-specific thread state */intcopy_thread(struct task_struct *p, const struct kernel_clone_args *args){ u64 clone_flags = args->flags; unsigned long usp = args->stack; unsigned long tls = args->tls; struct pt_regs *cregs = &(p->thread.regs); void *stack = task_stack_page(p); /* We have to use void * instead of a function pointer, because * function pointers aren't a pointer to the function on 64-bit. * Make them const so the compiler knows they live in .text */ extern void * const ret_from_kernel_thread; extern void * const child_return;
if (unlikely(args->fn)) { /* kernel thread */ memset(cregs, 0, sizeof(struct pt_regs)); if (args->idle) /* idle thread */ return 0; /* Must exit via ret_from_kernel_thread in order * to call schedule_tail() */ cregs->ksp = (unsigned long) stack + FRAME_SIZE + PT_SZ_ALGN; cregs->kpc = (unsigned long) &ret_from_kernel_thread; /* * Copy function and argument to be called from * ret_from_kernel_thread. */#ifdef CONFIG_64BIT cregs->gr[27] = ((unsigned long *)args->fn)[3]; cregs->gr[26] = ((unsigned long *)args->fn)[2];#else cregs->gr[26] = (unsigned long) args->fn;#endif cregs->gr[25] = (unsigned long) args->fn_arg; } else { /* user thread */ /* usp must be word aligned. This also prevents users from * passing in the value 1 (which is the signal for a special * return for a kernel thread) */ if (usp) { usp = ALIGN(usp, 4); if (likely(usp)) cregs->gr[30] = usp; } cregs->ksp = (unsigned long) stack + FRAME_SIZE; cregs->kpc = (unsigned long) &child_return;
/* Setup thread TLS area */ if (clone_flags & CLONE_SETTLS) cregs->cr27 = tls; }
return 0;}
unsigned long__get_wchan(struct task_struct *p){ struct unwind_frame_info info; unsigned long ip; int count = 0;
/* * These bracket the sleeping functions.. */
unwind_frame_init_from_blocked_task(&info, p); do { if (unwind_once(&info) < 0) return 0; if (task_is_running(p)) return 0; ip = info.ip; if (!in_sched_functions(ip)) return ip; } while (count++ < MAX_UNWIND_ENTRIES); return 0;}