/* * Blackfin architecture-dependent process handling * * Copyright 2004-2009 Analog Devices Inc. * * Licensed under the GPL-2 or later */ #include <linux/module.h>#include <linux/unistd.h>#include <linux/user.h>#include <linux/uaccess.h>#include <linux/slab.h>#include <linux/sched.h>#include <linux/tick.h>#include <linux/fs.h>#include <linux/err.h> #include <asm/blackfin.h>#include <asm/fixed_code.h>#include <asm/mem_map.h>#include <asm/irq.h> asmlinkage void ret_from_fork(void); /* Points to the SDRAM backup memory for the stack that is currently in * L1 scratchpad memory. */void *current_l1_stack_save; /* The number of tasks currently using a L1 stack area.  The SRAM is * allocated/deallocated whenever this changes from/to zero. */int nr_l1stack_tasks; /* Start and length of the area in L1 scratchpad memory which we've allocated * for process stacks. */void *l1_stack_base;unsigned long l1_stack_len; /* * Powermanagement idle function, if any.. */void (*pm_idle)(void) = NULL;EXPORT_SYMBOL(pm_idle); void (*pm_power_off)(void) = NULL;EXPORT_SYMBOL(pm_power_off); /* * The idle loop on BFIN */#ifdef CONFIG_IDLE_L1static void default_idle(void)__attribute__((l1_text));void cpu_idle(void)__attribute__((l1_text));#endif /* * This is our default idle handler.  We need to disable * interrupts here to ensure we don't miss a wakeup call. */static void default_idle(void){#ifdef CONFIG_IPIPE	ipipe_suspend_domain();#endif	hard_local_irq_disable();	if (!need_resched())		idle_with_irq_disabled(); 	hard_local_irq_enable();} /* * The idle thread.  We try to conserve power, while trying to keep * overall latency low.  The architecture specific idle is passed * a value to indicate the level of "idleness" of the system. */void cpu_idle(void){	/* endless idle loop with no priority at all */	while (1) {		void (*idle)(void) = pm_idle; #ifdef CONFIG_HOTPLUG_CPU		if (cpu_is_offline(smp_processor_id()))			cpu_die();#endif		if (!idle)			idle = default_idle;		tick_nohz_idle_enter();		rcu_idle_enter();		while (!need_resched())			idle();		rcu_idle_exit();		tick_nohz_idle_exit();		preempt_enable_no_resched();		schedule();		preempt_disable();	}} /* * This gets run with P1 containing the * function to call, and R1 containing * the "args".  Note P0 is clobbered on the way here. */void kernel_thread_helper(void);__asm__(".section .text\n"	".align 4\n"	"_kernel_thread_helper:\n\t"	"\tsp += -12;\n\t"	"\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous"); /* * Create a kernel thread. */pid_t kernel_thread(int (*fn) (void *), void *arg, unsigned long flags){	struct pt_regs regs; 	memset(&regs, 0, sizeof(regs)); 	regs.r1 = (unsigned long)arg;	regs.p1 = (unsigned long)fn;	regs.pc = (unsigned long)kernel_thread_helper;	regs.orig_p0 = -1;	/* Set bit 2 to tell ret_from_fork we should be returning to kernel	   mode.  */	regs.ipend = 0x8002;	__asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,		       NULL);}EXPORT_SYMBOL(kernel_thread); /* * Do necessary setup to start up a newly executed thread. * * pass the data segment into user programs if it exists, * it can't hurt anything as far as I can tell */void start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp){	regs->pc = new_ip;	if (current->mm)		regs->p5 = current->mm->start_data;#ifndef CONFIG_SMP	task_thread_info(current)->l1_task_info.stack_start =		(void *)current->mm->context.stack_start;	task_thread_info(current)->l1_task_info.lowest_sp = (void *)new_sp;	memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info,	       sizeof(*L1_SCRATCH_TASK_INFO));#endif	wrusp(new_sp);}EXPORT_SYMBOL_GPL(start_thread); void flush_thread(void){} asmlinkage int bfin_vfork(struct pt_regs *regs){	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL,		       NULL);} asmlinkage int bfin_clone(struct pt_regs *regs){	unsigned long clone_flags;	unsigned long newsp; #ifdef __ARCH_SYNC_CORE_DCACHE	if (current->nr_cpus_allowed == num_possible_cpus())		set_cpus_allowed_ptr(current, cpumask_of(smp_processor_id()));#endif 	/* syscall2 puts clone_flags in r0 and usp in r1 */	clone_flags = regs->r0;	newsp = regs->r1;	if (!newsp)		newsp = rdusp();	else		newsp -= 12;	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);} intcopy_thread(unsigned long clone_flags,	    unsigned long usp, unsigned long topstk,	    struct task_struct *p, struct pt_regs *regs){	struct pt_regs *childregs; 	childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;	*childregs = *regs;	childregs->r0 = 0; 	p->thread.usp = usp;	p->thread.ksp = (unsigned long)childregs;	p->thread.pc = (unsigned long)ret_from_fork; 	return 0;} /* * sys_execve() executes a new program. */asmlinkage int sys_execve(const char __user *name,			  const char __user *const __user *argv,			  const char __user *const __user *envp){	int error;	char *filename;	struct pt_regs *regs = (struct pt_regs *)((&name) + 6); 	filename = getname(name);	error = PTR_ERR(filename);	if (IS_ERR(filename))		return error;	error = do_execve(filename, argv, envp, regs);	putname(filename);	return error;} unsigned long get_wchan(struct task_struct *p){	unsigned long fp, pc;	unsigned long stack_page;	int count = 0;	if (!p || p == current || p->state == TASK_RUNNING)		return 0; 	stack_page = (unsigned long)p;	fp = p->thread.usp;	do {		if (fp < stack_page + sizeof(struct thread_info) ||		    fp >= 8184 + stack_page)			return 0;		pc = ((unsigned long *)fp)[1];		if (!in_sched_functions(pc))			return pc;		fp = *(unsigned long *)fp;	}	while (count++ < 16);	return 0;} void finish_atomic_sections (struct pt_regs *regs){	int __user *up0 = (int __user *)regs->p0; 	switch (regs->pc) {	default:		/* not in middle of an atomic step, so resume like normal */		return; 	case ATOMIC_XCHG32 + 2:		put_user(regs->r1, up0);		break; 	case ATOMIC_CAS32 + 2:	case ATOMIC_CAS32 + 4:		if (regs->r0 == regs->r1)	case ATOMIC_CAS32 + 6:			put_user(regs->r2, up0);		break; 	case ATOMIC_ADD32 + 2:		regs->r0 = regs->r1 + regs->r0;		/* fall through */	case ATOMIC_ADD32 + 4:		put_user(regs->r0, up0);		break; 	case ATOMIC_SUB32 + 2:		regs->r0 = regs->r1 - regs->r0;		/* fall through */	case ATOMIC_SUB32 + 4:		put_user(regs->r0, up0);		break; 	case ATOMIC_IOR32 + 2:		regs->r0 = regs->r1 | regs->r0;		/* fall through */	case ATOMIC_IOR32 + 4:		put_user(regs->r0, up0);		break; 	case ATOMIC_AND32 + 2:		regs->r0 = regs->r1 & regs->r0;		/* fall through */	case ATOMIC_AND32 + 4:		put_user(regs->r0, up0);		break; 	case ATOMIC_XOR32 + 2:		regs->r0 = regs->r1 ^ regs->r0;		/* fall through */	case ATOMIC_XOR32 + 4:		put_user(regs->r0, up0);		break;	} 	/*	 * We've finished the atomic section, and the only thing left for	 * userspace is to do a RTS, so we might as well handle that too	 * since we need to update the PC anyways.	 */	regs->pc = regs->rets;} static inlineint in_mem(unsigned long addr, unsigned long size,           unsigned long start, unsigned long end){	return addr >= start && addr + size <= end;}static inlineint in_mem_const_off(unsigned long addr, unsigned long size, unsigned long off,                     unsigned long const_addr, unsigned long const_size){	return const_size &&	       in_mem(addr, size, const_addr + off, const_addr + const_size);}static inlineint in_mem_const(unsigned long addr, unsigned long size,                 unsigned long const_addr, unsigned long const_size){	return in_mem_const_off(addr, size, 0, const_addr, const_size);}#ifdef CONFIG_BF60x#define ASYNC_ENABLED(bnum, bctlnum)	1#else#define ASYNC_ENABLED(bnum, bctlnum) \({ \	(bfin_read_EBIU_AMGCTL() & 0xe) < ((bnum + 1) << 1) ? 0 : \	bfin_read_EBIU_AMBCTL##bctlnum() & B##bnum##RDYEN ? 0 : \	1; \})#endif/* * We can't read EBIU banks that aren't enabled or we end up hanging * on the access to the async space.  Make sure we validate accesses * that cross async banks too. *	0 - found, but unusable *	1 - found & usable *	2 - not found */staticint in_async(unsigned long addr, unsigned long size){	if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE) {		if (!ASYNC_ENABLED(0, 0))			return 0;		if (addr + size <= ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)			return 1;		size -= ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE - addr;		addr = ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE;	}	if (addr >= ASYNC_BANK1_BASE && addr < ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE) {		if (!ASYNC_ENABLED(1, 0))			return 0;		if (addr + size <= ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)			return 1;		size -= ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE - addr;		addr = ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE;	}	if (addr >= ASYNC_BANK2_BASE && addr < ASYNC_BANK2_BASE + ASYNC_BANK2_SIZE) {		if (!ASYNC_ENABLED(2, 1))			return 0;		if (addr + size <= ASYNC_BANK2_BASE + ASYNC_BANK2_SIZE)			return 1;		size -= ASYNC_BANK2_BASE + ASYNC_BANK2_SIZE - addr;		addr = ASYNC_BANK2_BASE + ASYNC_BANK2_SIZE;	}	if (addr >= ASYNC_BANK3_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE) {		if (ASYNC_ENABLED(3, 1))			return 0;		if (addr + size <= ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE)			return 1;		return 0;	} 	/* not within async bounds */	return 2;} int bfin_mem_access_type(unsigned long addr, unsigned long size){	int cpu = raw_smp_processor_id(); 	/* Check that things do not wrap around */	if (addr > ULONG_MAX - size)		return -EFAULT; 	if (in_mem(addr, size, FIXED_CODE_START, physical_mem_end))		return BFIN_MEM_ACCESS_CORE; 	if (in_mem_const(addr, size, L1_CODE_START, L1_CODE_LENGTH))		return cpu == 0 ? BFIN_MEM_ACCESS_ITEST : BFIN_MEM_ACCESS_IDMA;	if (in_mem_const(addr, size, L1_SCRATCH_START, L1_SCRATCH_LENGTH))		return cpu == 0 ? BFIN_MEM_ACCESS_CORE_ONLY : -EFAULT;	if (in_mem_const(addr, size, L1_DATA_A_START, L1_DATA_A_LENGTH))		return cpu == 0 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;	if (in_mem_const(addr, size, L1_DATA_B_START, L1_DATA_B_LENGTH))		return cpu == 0 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;#ifdef COREB_L1_CODE_START	if (in_mem_const(addr, size, COREB_L1_CODE_START, COREB_L1_CODE_LENGTH))		return cpu == 1 ? BFIN_MEM_ACCESS_ITEST : BFIN_MEM_ACCESS_IDMA;	if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))		return cpu == 1 ? BFIN_MEM_ACCESS_CORE_ONLY : -EFAULT;	if (in_mem_const(addr, size, COREB_L1_DATA_A_START, COREB_L1_DATA_A_LENGTH))		return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;	if (in_mem_const(addr, size, COREB_L1_DATA_B_START, COREB_L1_DATA_B_LENGTH))		return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;#endif	if (in_mem_const(addr, size, L2_START, L2_LENGTH))		return BFIN_MEM_ACCESS_CORE; 	if (addr >= SYSMMR_BASE)		return BFIN_MEM_ACCESS_CORE_ONLY; 	switch (in_async(addr, size)) {	case 0: return -EFAULT;	case 1: return BFIN_MEM_ACCESS_CORE;	case 2: /* fall through */;	} 	if (in_mem_const(addr, size, BOOT_ROM_START, BOOT_ROM_LENGTH))		return BFIN_MEM_ACCESS_CORE;	if (in_mem_const(addr, size, L1_ROM_START, L1_ROM_LENGTH))		return BFIN_MEM_ACCESS_DMA; 	return -EFAULT;} #if defined(CONFIG_ACCESS_CHECK)#ifdef CONFIG_ACCESS_OK_L1__attribute__((l1_text))#endif/* Return 1 if access to memory range is OK, 0 otherwise */int _access_ok(unsigned long addr, unsigned long size){	int aret; 	if (size == 0)		return 1;	/* Check that things do not wrap around */	if (addr > ULONG_MAX - size)		return 0;	if (segment_eq(get_fs(), KERNEL_DS))		return 1;#ifdef CONFIG_MTD_UCLINUX	if (1)#else	if (0)#endif	{		if (in_mem(addr, size, memory_start, memory_end))			return 1;		if (in_mem(addr, size, memory_mtd_end, physical_mem_end))			return 1;# ifndef CONFIG_ROMFS_ON_MTD		if (0)# endif			/* For XIP, allow user space to use pointers within the ROMFS.  */			if (in_mem(addr, size, memory_mtd_start, memory_mtd_end))				return 1;	} else {		if (in_mem(addr, size, memory_start, physical_mem_end))			return 1;	} 	if (in_mem(addr, size, (unsigned long)__init_begin, (unsigned long)__init_end))		return 1; 	if (in_mem_const(addr, size, L1_CODE_START, L1_CODE_LENGTH))		return 1;	if (in_mem_const_off(addr, size, _etext_l1 - _stext_l1, L1_CODE_START, L1_CODE_LENGTH))		return 1;	if (in_mem_const_off(addr, size, _ebss_l1 - _sdata_l1, L1_DATA_A_START, L1_DATA_A_LENGTH))		return 1;	if (in_mem_const_off(addr, size, _ebss_b_l1 - _sdata_b_l1, L1_DATA_B_START, L1_DATA_B_LENGTH))		return 1;#ifdef COREB_L1_CODE_START	if (in_mem_const(addr, size, COREB_L1_CODE_START, COREB_L1_CODE_LENGTH))		return 1;	if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))		return 1;	if (in_mem_const(addr, size, COREB_L1_DATA_A_START, COREB_L1_DATA_A_LENGTH))		return 1;	if (in_mem_const(addr, size, COREB_L1_DATA_B_START, COREB_L1_DATA_B_LENGTH))		return 1;#endif #ifndef CONFIG_EXCEPTION_L1_SCRATCH	if (in_mem_const(addr, size, (unsigned long)l1_stack_base, l1_stack_len))

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