![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
324 lines
8.1 KiB
C
324 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PARISC Architecture-dependent parts of process handling
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* based on the work for i386
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*
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* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
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* Copyright (C) 2000 Martin K Petersen <mkp at mkp.net>
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* Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
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* Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org>
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* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
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* Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org>
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* Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com>
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* Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org>
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* Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
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* Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org>
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* Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
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* Copyright (C) 2001-2014 Helge Deller <deller@gmx.de>
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* Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
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*/
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#include <stdarg.h>
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#include <linux/elf.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <linux/personality.h>
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#include <linux/ptrace.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/task.h>
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#include <linux/sched/task_stack.h>
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#include <linux/slab.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/kallsyms.h>
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#include <linux/uaccess.h>
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#include <linux/rcupdate.h>
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#include <linux/random.h>
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#include <linux/nmi.h>
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#include <asm/io.h>
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#include <asm/asm-offsets.h>
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#include <asm/assembly.h>
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#include <asm/pdc.h>
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#include <asm/pdc_chassis.h>
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#include <asm/pgalloc.h>
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#include <asm/unwind.h>
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#include <asm/sections.h>
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#define COMMAND_GLOBAL F_EXTEND(0xfffe0030)
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#define CMD_RESET 5 /* reset any module */
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/*
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** The Wright Brothers and Gecko systems have a H/W problem
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** (Lasi...'nuf said) may cause a broadcast reset to lockup
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** the system. An HVERSION dependent PDC call was developed
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** to perform a "safe", platform specific broadcast reset instead
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** of kludging up all the code.
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**
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** Older machines which do not implement PDC_BROADCAST_RESET will
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** return (with an error) and the regular broadcast reset can be
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** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET
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** the PDC call will not return (the system will be reset).
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*/
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void machine_restart(char *cmd)
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{
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#ifdef FASTBOOT_SELFTEST_SUPPORT
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/*
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** If user has modified the Firmware Selftest Bitmap,
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** run the tests specified in the bitmap after the
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** system is rebooted w/PDC_DO_RESET.
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**
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** ftc_bitmap = 0x1AUL "Skip destructive memory tests"
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**
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** Using "directed resets" at each processor with the MEM_TOC
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** vector cleared will also avoid running destructive
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** memory self tests. (Not implemented yet)
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*/
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if (ftc_bitmap) {
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pdc_do_firm_test_reset(ftc_bitmap);
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}
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#endif
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/* set up a new led state on systems shipped with a LED State panel */
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pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
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/* "Normal" system reset */
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pdc_do_reset();
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/* Nope...box should reset with just CMD_RESET now */
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gsc_writel(CMD_RESET, COMMAND_GLOBAL);
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/* Wait for RESET to lay us to rest. */
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while (1) ;
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}
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void (*chassis_power_off)(void);
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/*
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* This routine is called from sys_reboot to actually turn off the
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* machine
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*/
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void machine_power_off(void)
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{
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/* If there is a registered power off handler, call it. */
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if (chassis_power_off)
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chassis_power_off();
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/* Put the soft power button back under hardware control.
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* If the user had already pressed the power button, the
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* following call will immediately power off. */
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pdc_soft_power_button(0);
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pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
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/* ipmi_poweroff may have been installed. */
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if (pm_power_off)
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pm_power_off();
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/* It seems we have no way to power the system off via
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* software. The user has to press the button himself. */
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printk(KERN_EMERG "System shut down completed.\n"
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"Please power this system off now.");
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/* prevent soft lockup/stalled CPU messages for endless loop. */
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rcu_sysrq_start();
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lockup_detector_soft_poweroff();
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for (;;);
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}
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void (*pm_power_off)(void);
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EXPORT_SYMBOL(pm_power_off);
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void machine_halt(void)
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{
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machine_power_off();
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}
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void flush_thread(void)
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{
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/* Only needs to handle fpu stuff or perf monitors.
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** REVISIT: several arches implement a "lazy fpu state".
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*/
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}
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void release_thread(struct task_struct *dead_task)
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{
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}
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/*
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* Fill in the FPU structure for a core dump.
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*/
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int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r)
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{
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if (regs == NULL)
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return 0;
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memcpy(r, regs->fr, sizeof *r);
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return 1;
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}
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int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
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{
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memcpy(r, tsk->thread.regs.fr, sizeof(*r));
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return 1;
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}
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/*
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* Idle thread support
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*
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* Detect when running on QEMU with SeaBIOS PDC Firmware and let
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* QEMU idle the host too.
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*/
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int running_on_qemu __ro_after_init;
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EXPORT_SYMBOL(running_on_qemu);
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void __cpuidle arch_cpu_idle_dead(void)
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{
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/* nop on real hardware, qemu will offline CPU. */
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asm volatile("or %%r31,%%r31,%%r31\n":::);
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}
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void __cpuidle arch_cpu_idle(void)
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{
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local_irq_enable();
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/* nop on real hardware, qemu will idle sleep. */
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asm volatile("or %%r10,%%r10,%%r10\n":::);
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}
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static int __init parisc_idle_init(void)
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{
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if (!running_on_qemu)
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cpu_idle_poll_ctrl(1);
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return 0;
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}
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arch_initcall(parisc_idle_init);
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/*
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* Copy architecture-specific thread state
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*/
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int
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copy_thread(unsigned long clone_flags, unsigned long usp,
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unsigned long kthread_arg, struct task_struct *p)
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{
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struct pt_regs *cregs = &(p->thread.regs);
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void *stack = task_stack_page(p);
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/* We have to use void * instead of a function pointer, because
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* function pointers aren't a pointer to the function on 64-bit.
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* Make them const so the compiler knows they live in .text */
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extern void * const ret_from_kernel_thread;
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extern void * const child_return;
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if (unlikely(p->flags & PF_KTHREAD)) {
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/* kernel thread */
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memset(cregs, 0, sizeof(struct pt_regs));
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if (!usp) /* idle thread */
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return 0;
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/* Must exit via ret_from_kernel_thread in order
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* to call schedule_tail()
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*/
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cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
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cregs->kpc = (unsigned long) &ret_from_kernel_thread;
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/*
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* Copy function and argument to be called from
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* ret_from_kernel_thread.
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*/
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#ifdef CONFIG_64BIT
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cregs->gr[27] = ((unsigned long *)usp)[3];
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cregs->gr[26] = ((unsigned long *)usp)[2];
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#else
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cregs->gr[26] = usp;
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#endif
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cregs->gr[25] = kthread_arg;
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} else {
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/* user thread */
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/* usp must be word aligned. This also prevents users from
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* passing in the value 1 (which is the signal for a special
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* return for a kernel thread) */
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if (usp) {
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usp = ALIGN(usp, 4);
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if (likely(usp))
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cregs->gr[30] = usp;
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}
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cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
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cregs->kpc = (unsigned long) &child_return;
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/* Setup thread TLS area from the 4th parameter in clone */
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if (clone_flags & CLONE_SETTLS)
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cregs->cr27 = cregs->gr[23];
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}
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return 0;
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}
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unsigned long
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get_wchan(struct task_struct *p)
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{
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struct unwind_frame_info info;
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unsigned long ip;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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/*
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* These bracket the sleeping functions..
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*/
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unwind_frame_init_from_blocked_task(&info, p);
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do {
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if (unwind_once(&info) < 0)
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return 0;
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ip = info.ip;
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if (!in_sched_functions(ip))
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return ip;
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} while (count++ < MAX_UNWIND_ENTRIES);
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return 0;
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}
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#ifdef CONFIG_64BIT
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void *dereference_function_descriptor(void *ptr)
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{
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Elf64_Fdesc *desc = ptr;
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void *p;
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if (!probe_kernel_address(&desc->addr, p))
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ptr = p;
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return ptr;
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}
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void *dereference_kernel_function_descriptor(void *ptr)
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{
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if (ptr < (void *)__start_opd ||
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ptr >= (void *)__end_opd)
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return ptr;
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return dereference_function_descriptor(ptr);
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}
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#endif
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static inline unsigned long brk_rnd(void)
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{
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return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT;
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}
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unsigned long arch_randomize_brk(struct mm_struct *mm)
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{
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unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd());
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if (ret < mm->brk)
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return mm->brk;
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return ret;
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}
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