/* * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008-2009 PetaLogix * Copyright (C) 2006 Atmark Techno, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/module.h>#include <linux/sched.h>#include <linux/pm.h>#include <linux/tick.h>#include <linux/bitops.h>#include <asm/system.h>#include <asm/pgalloc.h>#include <asm/uaccess.h> /* for USER_DS macros */#include <asm/cacheflush.h> void show_regs(struct pt_regs *regs){	printk(KERN_INFO " Registers dump: mode=%X\r\n", regs->pt_mode);	printk(KERN_INFO " r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",				regs->r1, regs->r2, regs->r3, regs->r4);	printk(KERN_INFO " r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",				regs->r5, regs->r6, regs->r7, regs->r8);	printk(KERN_INFO " r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",				regs->r9, regs->r10, regs->r11, regs->r12);	printk(KERN_INFO " r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",				regs->r13, regs->r14, regs->r15, regs->r16);	printk(KERN_INFO " r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",				regs->r17, regs->r18, regs->r19, regs->r20);	printk(KERN_INFO " r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",				regs->r21, regs->r22, regs->r23, regs->r24);	printk(KERN_INFO " r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",				regs->r25, regs->r26, regs->r27, regs->r28);	printk(KERN_INFO " r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",				regs->r29, regs->r30, regs->r31, regs->pc);	printk(KERN_INFO " msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",				regs->msr, regs->ear, regs->esr, regs->fsr);} void (*pm_idle)(void);void (*pm_power_off)(void) = NULL;EXPORT_SYMBOL(pm_power_off); static int hlt_counter = 1; void disable_hlt(void){	hlt_counter++;}EXPORT_SYMBOL(disable_hlt); void enable_hlt(void){	hlt_counter--;}EXPORT_SYMBOL(enable_hlt); static int __init nohlt_setup(char *__unused){	hlt_counter = 1;	return 1;}__setup("nohlt", nohlt_setup); static int __init hlt_setup(char *__unused){	hlt_counter = 0;	return 1;}__setup("hlt", hlt_setup); void default_idle(void){	if (likely(hlt_counter)) {		local_irq_disable();		stop_critical_timings();		cpu_relax();		start_critical_timings();		local_irq_enable();	} else {		clear_thread_flag(TIF_POLLING_NRFLAG);		smp_mb__after_clear_bit();		local_irq_disable();		while (!need_resched())			cpu_sleep();		local_irq_enable();		set_thread_flag(TIF_POLLING_NRFLAG);	}} void cpu_idle(void){	set_thread_flag(TIF_POLLING_NRFLAG); 	/* endless idle loop with no priority at all */	while (1) {		void (*idle)(void) = pm_idle; 		if (!idle)			idle = default_idle; 		tick_nohz_stop_sched_tick(1);		while (!need_resched())			idle();		tick_nohz_restart_sched_tick(); 		preempt_enable_no_resched();		schedule();		preempt_disable();		check_pgt_cache();	}} void flush_thread(void){} int copy_thread(unsigned long clone_flags, unsigned long usp,		unsigned long unused,		struct task_struct *p, struct pt_regs *regs){	struct pt_regs *childregs = task_pt_regs(p);	struct thread_info *ti = task_thread_info(p); 	*childregs = *regs;	if (user_mode(regs))		childregs->r1 = usp;	else		childregs->r1 = ((unsigned long) ti) + THREAD_SIZE; #ifndef CONFIG_MMU	memset(&ti->cpu_context, 0, sizeof(struct cpu_context));	ti->cpu_context.r1 = (unsigned long)childregs;	ti->cpu_context.msr = (unsigned long)childregs->msr;#else 	/* if creating a kernel thread then update the current reg (we don't	 * want to use the parent's value when restoring by POP_STATE) */	if (kernel_mode(regs))		/* save new current on stack to use POP_STATE */		childregs->CURRENT_TASK = (unsigned long)p;	/* if returning to user then use the parent's value of this register */ 	/* if we're creating a new kernel thread then just zeroing all	 * the registers. That's OK for a brand new thread.*/	/* Pls. note that some of them will be restored in POP_STATE */	if (kernel_mode(regs))		memset(&ti->cpu_context, 0, sizeof(struct cpu_context));	/* if this thread is created for fork/vfork/clone, then we want to	 * restore all the parent's context */	/* in addition to the registers which will be restored by POP_STATE */	else {		ti->cpu_context = *(struct cpu_context *)regs;		childregs->msr |= MSR_UMS;	} 	/* FIXME STATE_SAVE_PT_OFFSET; */	ti->cpu_context.r1  = (unsigned long)childregs;	/* we should consider the fact that childregs is a copy of the parent	 * regs which were saved immediately after entering the kernel state	 * before enabling VM. This MSR will be restored in switch_to and	 * RETURN() and we want to have the right machine state there	 * specifically this state must have INTs disabled before and enabled	 * after performing rtbd	 * compose the right MSR for RETURN(). It will work for switch_to also	 * excepting for VM and UMS	 * don't touch UMS , CARRY and cache bits	 * right now MSR is a copy of parent one */	childregs->msr |= MSR_BIP;	childregs->msr &= ~MSR_EIP;	childregs->msr |= MSR_IE;	childregs->msr &= ~MSR_VM;	childregs->msr |= MSR_VMS;	childregs->msr |= MSR_EE; /* exceptions will be enabled*/ 	ti->cpu_context.msr = (childregs->msr|MSR_VM);	ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */#endif	ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8; 	if (clone_flags & CLONE_SETTLS)		; 	return 0;} #ifndef CONFIG_MMU/* * Return saved PC of a blocked thread. */unsigned long thread_saved_pc(struct task_struct *tsk){	struct cpu_context *ctx =		&(((struct thread_info *)(tsk->stack))->cpu_context); 	/* Check whether the thread is blocked in resume() */	if (in_sched_functions(ctx->r15))		return (unsigned long)ctx->r15;	else		return ctx->r14;}#endif static void kernel_thread_helper(int (*fn)(void *), void *arg){	fn(arg);	do_exit(-1);} int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags){	struct pt_regs regs; 	memset(&regs, 0, sizeof(regs));	/* store them in non-volatile registers */	regs.r5 = (unsigned long)fn;	regs.r6 = (unsigned long)arg;	local_save_flags(regs.msr);	regs.pc = (unsigned long)kernel_thread_helper;	regs.pt_mode = 1; 	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,			&regs, 0, NULL, NULL);}EXPORT_SYMBOL_GPL(kernel_thread); unsigned long get_wchan(struct task_struct *p){/* TBD (used by procfs) */	return 0;} /* Set up a thread for executing a new program */void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp){	set_fs(USER_DS);	regs->pc = pc;	regs->r1 = usp;	regs->pt_mode = 0;#ifdef CONFIG_MMU	regs->msr |= MSR_UMS;#endif} #ifdef CONFIG_MMU#include <linux/elfcore.h>/* * Set up a thread for executing a new program */int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs){	return 0; /* MicroBlaze has no separate FPU registers */}#endif /* CONFIG_MMU */