338 lines
8.8 KiB
C
Executable file
338 lines
8.8 KiB
C
Executable file
/*
|
|
* 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>
|
|
*
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include <stdarg.h>
|
|
|
|
#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/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 <asm/io.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/assembly.h>
|
|
#include <asm/pdc.h>
|
|
#include <asm/pdc_chassis.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/unwind.h>
|
|
#include <asm/sections.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);
|
|
|
|
/* "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) ;
|
|
|
|
}
|
|
|
|
void (*chassis_power_off)(void);
|
|
|
|
/*
|
|
* This routine is called from sys_reboot to actually turn off the
|
|
* machine
|
|
*/
|
|
void machine_power_off(void)
|
|
{
|
|
/* If there is a registered power off handler, call it. */
|
|
if (chassis_power_off)
|
|
chassis_power_off();
|
|
|
|
/* 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. */
|
|
if (pm_power_off)
|
|
pm_power_off();
|
|
|
|
/* It seems we have no way to power the system off via
|
|
* software. The user has to press the button himself. */
|
|
|
|
printk(KERN_EMERG "System shut down completed.\n"
|
|
"Please power this system off now.");
|
|
|
|
/* prevent soft lockup/stalled CPU messages for endless loop. */
|
|
rcu_sysrq_start();
|
|
lockup_detector_soft_poweroff();
|
|
for (;;);
|
|
}
|
|
|
|
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".
|
|
*/
|
|
}
|
|
|
|
void release_thread(struct task_struct *dead_task)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Fill in the FPU structure for a core dump.
|
|
*/
|
|
|
|
int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r)
|
|
{
|
|
if (regs == NULL)
|
|
return 0;
|
|
|
|
memcpy(r, regs->fr, sizeof *r);
|
|
return 1;
|
|
}
|
|
|
|
int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
|
|
{
|
|
memcpy(r, tsk->thread.regs.fr, sizeof(*r));
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Idle thread support
|
|
*
|
|
* Detect when running on QEMU with SeaBIOS PDC Firmware and let
|
|
* QEMU idle the host too.
|
|
*/
|
|
|
|
int running_on_qemu __read_mostly;
|
|
EXPORT_SYMBOL(running_on_qemu);
|
|
|
|
void __cpuidle arch_cpu_idle_dead(void)
|
|
{
|
|
/* nop on real hardware, qemu will offline CPU. */
|
|
asm volatile("or %%r31,%%r31,%%r31\n":::);
|
|
}
|
|
|
|
void __cpuidle arch_cpu_idle(void)
|
|
{
|
|
local_irq_enable();
|
|
|
|
/* 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
|
|
*/
|
|
int
|
|
copy_thread(unsigned long clone_flags, unsigned long usp,
|
|
unsigned long kthread_arg, struct task_struct *p)
|
|
{
|
|
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(p->flags & PF_KTHREAD)) {
|
|
/* kernel thread */
|
|
memset(cregs, 0, sizeof(struct pt_regs));
|
|
if (!usp) /* idle thread */
|
|
return 0;
|
|
/* Must exit via ret_from_kernel_thread in order
|
|
* to call schedule_tail()
|
|
*/
|
|
cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
|
|
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 *)usp)[3];
|
|
cregs->gr[26] = ((unsigned long *)usp)[2];
|
|
#else
|
|
cregs->gr[26] = usp;
|
|
#endif
|
|
cregs->gr[25] = kthread_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 + THREAD_SZ_ALGN + FRAME_SIZE;
|
|
cregs->kpc = (unsigned long) &child_return;
|
|
|
|
/* Setup thread TLS area from the 4th parameter in clone */
|
|
if (clone_flags & CLONE_SETTLS)
|
|
cregs->cr27 = cregs->gr[23];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long
|
|
get_wchan(struct task_struct *p)
|
|
{
|
|
struct unwind_frame_info info;
|
|
unsigned long ip;
|
|
int count = 0;
|
|
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
return 0;
|
|
|
|
/*
|
|
* These bracket the sleeping functions..
|
|
*/
|
|
|
|
unwind_frame_init_from_blocked_task(&info, p);
|
|
do {
|
|
if (unwind_once(&info) < 0)
|
|
return 0;
|
|
ip = info.ip;
|
|
if (!in_sched_functions(ip))
|
|
return ip;
|
|
} while (count++ < MAX_UNWIND_ENTRIES);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_64BIT
|
|
void *dereference_function_descriptor(void *ptr)
|
|
{
|
|
Elf64_Fdesc *desc = ptr;
|
|
void *p;
|
|
|
|
if (!probe_kernel_address(&desc->addr, p))
|
|
ptr = p;
|
|
return ptr;
|
|
}
|
|
|
|
void *dereference_kernel_function_descriptor(void *ptr)
|
|
{
|
|
if (ptr < (void *)__start_opd ||
|
|
ptr >= (void *)__end_opd)
|
|
return ptr;
|
|
|
|
return dereference_function_descriptor(ptr);
|
|
}
|
|
#endif
|
|
|
|
static inline unsigned long brk_rnd(void)
|
|
{
|
|
return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT;
|
|
}
|
|
|
|
unsigned long arch_randomize_brk(struct mm_struct *mm)
|
|
{
|
|
unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd());
|
|
|
|
if (ret < mm->brk)
|
|
return mm->brk;
|
|
return ret;
|
|
}
|