/* *    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) 2001-2007 Helge Deller <deller at parisc-linux.org> *    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/module.h>#include <linux/personality.h>#include <linux/ptrace.h>#include <linux/sched.h>#include <linux/slab.h>#include <linux/stddef.h>#include <linux/unistd.h>#include <linux/kallsyms.h>#include <linux/uaccess.h> #include <asm/io.h>#include <asm/asm-offsets.h>#include <asm/pdc.h>#include <asm/pdc_chassis.h>#include <asm/pgalloc.h>#include <asm/unwind.h>#include <asm/sections.h> /* * The idle thread. There's no useful work to be * done, so just try to conserve power and have a * low exit latency (ie sit in a loop waiting for * somebody to say that they'd like to reschedule) */void cpu_idle(void){	set_thread_flag(TIF_POLLING_NRFLAG); 	/* endless idle loop with no priority at all */	while (1) {		while (!need_resched())			barrier();		preempt_enable_no_resched();		schedule();		preempt_disable();		check_pgt_cache();	}}  #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 machine_halt(void){	/*	** The LED/ChassisCodes are updated by the led_halt()	** function, called by the reboot notifier chain.	*/} 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);			/* 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.");} void (*pm_power_off)(void) = machine_power_off;EXPORT_SYMBOL(pm_power_off); /* * Create a kernel thread */ extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags){ 	/*	 * FIXME: Once we are sure we don't need any debug here,	 *	  kernel_thread can become a #define.	 */ 	return __kernel_thread(fn, arg, flags);}EXPORT_SYMBOL(kernel_thread); /* * Free current thread data structures etc.. */void exit_thread(void){} void flush_thread(void){	/* Only needs to handle fpu stuff or perf monitors.	** REVISIT: several arches implement a "lazy fpu state".	*/	set_fs(USER_DS);} 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;} /* Note that "fork()" is implemented in terms of clone, with   parameters (SIGCHLD, regs->gr[30], regs). */intsys_clone(unsigned long clone_flags, unsigned long usp,	  struct pt_regs *regs){  	/* Arugments from userspace are:	   r26 = Clone flags.	   r25 = Child stack.	   r24 = parent_tidptr.	   r23 = Is the TLS storage descriptor 	   r22 = child_tidptr 	   	   However, these last 3 args are only examined	   if the proper flags are set. */	int __user *parent_tidptr = (int __user *)regs->gr[24];	int __user *child_tidptr  = (int __user *)regs->gr[22]; 	/* 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) */	usp = ALIGN(usp, 4); 	/* A zero value for usp means use the current stack */	if (usp == 0)	  usp = regs->gr[30]; 	return do_fork(clone_flags, usp, regs, 0, parent_tidptr, child_tidptr);} intsys_vfork(struct pt_regs *regs){	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gr[30], regs, 0, NULL, NULL);} intcopy_thread(unsigned long clone_flags, unsigned long usp,	    unsigned long unused,	/* in ia64 this is "user_stack_size" */	    struct task_struct * p, struct pt_regs * pregs){	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;#ifdef CONFIG_HPUX	extern void * const hpux_child_return;#endif 	*cregs = *pregs; 	/* Set the return value for the child.  Note that this is not           actually restored by the syscall exit path, but we put it           here for consistency in case of signals. */	cregs->gr[28] = 0; /* child */ 	/*	 * We need to differentiate between a user fork and a	 * kernel fork. We can't use user_mode, because the	 * the syscall path doesn't save iaoq. Right now	 * We rely on the fact that kernel_thread passes	 * in zero for usp.	 */	if (usp == 1) {		/* kernel thread */		cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN;		/* Must exit via ret_from_kernel_thread in order		 * to call schedule_tail()		 */		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] = pregs->gr[27];#endif		cregs->gr[26] = pregs->gr[26];		cregs->gr[25] = pregs->gr[25];	} else {		/* user thread */		/*		 * Note that the fork wrappers are responsible		 * for setting gr[21].		 */ 		/* Use same stack depth as parent */		cregs->ksp = (unsigned long)stack			+ (pregs->gr[21] & (THREAD_SIZE - 1));		cregs->gr[30] = usp;		if (p->personality == PER_HPUX) {#ifdef CONFIG_HPUX			cregs->kpc = (unsigned long) &hpux_child_return;#else			BUG();#endif		} else {			cregs->kpc = (unsigned long) &child_return;		}		/* Setup thread TLS area from the 4th parameter in clone */		if (clone_flags & CLONE_SETTLS)		  cregs->cr27 = pregs->gr[23];		} 	return 0;} unsigned long thread_saved_pc(struct task_struct *t){	return t->thread.regs.kpc;} /* * sys_execve() executes a new program. */ asmlinkage int sys_execve(struct pt_regs *regs){	int error;	char *filename; 	filename = getname((const char __user *) regs->gr[26]);	error = PTR_ERR(filename);	if (IS_ERR(filename))		goto out;	error = do_execve(filename,			  (const char __user *const __user *) regs->gr[25],			  (const char __user *const __user *) regs->gr[24],			  regs);	putname(filename);out: 	return error;} extern int __execve(const char *filename,		    const char *const argv[],		    const char *const envp[], struct task_struct *task);int kernel_execve(const char *filename,		  const char *const argv[],		  const char *const envp[]){	return __execve(filename, argv, envp, current);} unsigned longget_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++ < 16);	return 0;} #ifdef CONFIG_64BITvoid *dereference_function_descriptor(void *ptr){	Elf64_Fdesc *desc = ptr;	void *p; 	if (!probe_kernel_address(&desc->addr, p))		ptr = p;	return ptr;}#endif