[deliverable/linux.git] / arch / blackfin / kernel / process.c

/*
 * File:         arch/blackfin/kernel/process.c
 * Based on:
 * Author:
 *
 * Created:
 * Description:  Blackfin architecture-dependent process handling.
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/smp_lock.h>
#include <linux/unistd.h>
#include <linux/user.h>
#include <linux/uaccess.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>

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_L1
static 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
	local_irq_disable_hw();
	if (!need_resched())
		idle_with_irq_disabled();

	local_irq_enable_hw();
}

/*
 * 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_stop_sched_tick(1);
		while (!need_resched())
			idle();
		tick_nohz_restart_sched_tick();
		preempt_enable_no_resched();
		schedule();
		preempt_disable();
	}
}

/* Fill in the fpu structure for a core dump.  */

int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpregs)
{
	return 1;
}

/*
 * 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)
{
	set_fs(USER_DS);
	regs->pc = new_ip;
	if (current->mm)
		regs->p5 = current->mm->start_data;
#ifdef 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->rt.nr_cpus_allowed == num_possible_cpus()) {
		current->cpus_allowed = cpumask_of_cpu(smp_processor_id());
		current->rt.nr_cpus_allowed = 1;
	}
#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);
}

int
copy_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(char __user *name, char __user * __user *argv, char __user * __user *envp)
{
	int error;
	char *filename;
	struct pt_regs *regs = (struct pt_regs *)((&name) + 6);

	lock_kernel();
	filename = getname(name);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;
	error = do_execve(filename, argv, envp, regs);
	putname(filename);
 out:
	unlock_kernel();
	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;

	if (regs->pc < ATOMIC_SEQS_START || regs->pc >= ATOMIC_SEQS_END)
		return;

	switch (regs->pc) {
	case ATOMIC_XCHG32 + 2:
		put_user(regs->r1, up0);
		regs->pc += 2;
		break;

	case ATOMIC_CAS32 + 2:
	case ATOMIC_CAS32 + 4:
		if (regs->r0 == regs->r1)
			put_user(regs->r2, up0);
		regs->pc = ATOMIC_CAS32 + 8;
		break;
	case ATOMIC_CAS32 + 6:
		put_user(regs->r2, up0);
		regs->pc += 2;
		break;

	case ATOMIC_ADD32 + 2:
		regs->r0 = regs->r1 + regs->r0;
		/* fall through */
	case ATOMIC_ADD32 + 4:
		put_user(regs->r0, up0);
		regs->pc = ATOMIC_ADD32 + 6;
		break;

	case ATOMIC_SUB32 + 2:
		regs->r0 = regs->r1 - regs->r0;
		/* fall through */
	case ATOMIC_SUB32 + 4:
		put_user(regs->r0, up0);
		regs->pc = ATOMIC_SUB32 + 6;
		break;

	case ATOMIC_IOR32 + 2:
		regs->r0 = regs->r1 | regs->r0;
		/* fall through */
	case ATOMIC_IOR32 + 4:
		put_user(regs->r0, up0);
		regs->pc = ATOMIC_IOR32 + 6;
		break;

	case ATOMIC_AND32 + 2:
		regs->r0 = regs->r1 & regs->r0;
		/* fall through */
	case ATOMIC_AND32 + 4:
		put_user(regs->r0, up0);
		regs->pc = ATOMIC_AND32 + 6;
		break;

	case ATOMIC_XOR32 + 2:
		regs->r0 = regs->r1 ^ regs->r0;
		/* fall through */
	case ATOMIC_XOR32 + 4:
		put_user(regs->r0, up0);
		regs->pc = ATOMIC_XOR32 + 6;
		break;
	}
}

static inline
int in_mem(unsigned long addr, unsigned long size,
           unsigned long start, unsigned long end)
{
	return addr >= start && addr + size <= end;
}
static inline
int 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 inline
int in_mem_const(unsigned long addr, unsigned long size,
                 unsigned long const_addr, unsigned long const_size)
{
	return in_mem_const_off(addr, 0, size, const_addr, const_size);
}
#define IN_ASYNC(bnum, bctlnum) \
({ \
	(bfin_read_EBIU_AMGCTL() & 0xe) < ((bnum + 1) << 1) ? -EFAULT : \
	bfin_read_EBIU_AMBCTL##bctlnum() & B##bnum##RDYEN ? -EFAULT : \
	BFIN_MEM_ACCESS_CORE; \
})

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, 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, 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, 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;

	/* We can't read EBIU banks that aren't enabled or we end up hanging
	 * on the access to the async space.
	 */
	if (in_mem_const(addr, size, ASYNC_BANK0_BASE, ASYNC_BANK0_SIZE))
		return IN_ASYNC(0, 0);
	if (in_mem_const(addr, size, ASYNC_BANK1_BASE, ASYNC_BANK1_SIZE))
		return IN_ASYNC(1, 0);
	if (in_mem_const(addr, size, ASYNC_BANK2_BASE, ASYNC_BANK2_SIZE))
		return IN_ASYNC(2, 1);
	if (in_mem_const(addr, size, ASYNC_BANK3_BASE, ASYNC_BANK3_SIZE))
		return IN_ASYNC(3, 1);

	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)
{
	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, 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, L1_DATA_A_LENGTH))
		return 1;
	if (in_mem_const(addr, size, COREB_L1_DATA_B_START, L1_DATA_B_LENGTH))
		return 1;
#endif
	if (in_mem_const_off(addr, size, _ebss_l2 - _stext_l2, L2_START, L2_LENGTH))
		return 1;

	if (in_mem_const(addr, size, BOOT_ROM_START, BOOT_ROM_LENGTH))
		return 1;
	if (in_mem_const(addr, size, L1_ROM_START, L1_ROM_LENGTH))
		return 1;

	return 0;
}
EXPORT_SYMBOL(_access_ok);
#endif /* CONFIG_ACCESS_CHECK */
Commit	Line	Data
1394f032 BW	1	/*
	2	* File: arch/blackfin/kernel/process.c
	3	* Based on:
	4	* Author:
	5	*
	6	* Created:
	7	* Description: Blackfin architecture-dependent process handling.
	8	*
	9	* Modified:
	10	* Copyright 2004-2006 Analog Devices Inc.
	11	*
	12	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, see the file COPYING, or write
	26	* to the Free Software Foundation, Inc.,
	27	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	28	*/
	29
	30	#include <linux/module.h>
	31	#include <linux/smp_lock.h>
	32	#include <linux/unistd.h>
	33	#include <linux/user.h>
1f83b8f1	34	#include <linux/uaccess.h>
8b5f79f9 VM	35	#include <linux/sched.h>
8b5f79f9 VM	36	#include <linux/tick.h>
d31c5ab1 BW	37	#include <linux/fs.h>
d31c5ab1 BW	38	#include <linux/err.h>
1394f032 BW	39
1394f032 BW	40	#include <asm/blackfin.h>
7adfb58f	41	#include <asm/fixed_code.h>
dbc895f9	42	#include <asm/mem_map.h>
1394f032	43
1394f032 BW	44	asmlinkage void ret_from_fork(void);
	45
	46	/* Points to the SDRAM backup memory for the stack that is currently in
	47	* L1 scratchpad memory.
	48	*/
	49	void *current_l1_stack_save;
	50
	51	/* The number of tasks currently using a L1 stack area. The SRAM is
	52	* allocated/deallocated whenever this changes from/to zero.
	53	*/
	54	int nr_l1stack_tasks;
	55
	56	/* Start and length of the area in L1 scratchpad memory which we've allocated
	57	* for process stacks.
	58	*/
	59	void *l1_stack_base;
	60	unsigned long l1_stack_len;
	61
	62	/*
	63	* Powermanagement idle function, if any..
	64	*/
	65	void (*pm_idle)(void) = NULL;
	66	EXPORT_SYMBOL(pm_idle);
	67
	68	void (*pm_power_off)(void) = NULL;
	69	EXPORT_SYMBOL(pm_power_off);
	70
1394f032 BW	71	/*
	72	* The idle loop on BFIN
	73	*/
	74	#ifdef CONFIG_IDLE_L1
8b5f79f9	75	static void default_idle(void)__attribute__((l1_text));
1394f032 BW	76	void cpu_idle(void)__attribute__((l1_text));
	77	#endif
	78
8b5f79f9 VM	79	/*
	80	* This is our default idle handler. We need to disable
	81	* interrupts here to ensure we don't miss a wakeup call.
	82	*/
	83	static void default_idle(void)
1394f032	84	{
6a01f230 YL	85	#ifdef CONFIG_IPIPE
	86	ipipe_suspend_domain();
	87	#endif
	88	local_irq_disable_hw();
8b5f79f9 VM	89	if (!need_resched())
8b5f79f9 VM	90	idle_with_irq_disabled();
1394f032	91
6a01f230	92	local_irq_enable_hw();
8b5f79f9	93	}
1394f032 BW	94
1394f032 BW	95	/*
8b5f79f9 VM	96	* The idle thread. We try to conserve power, while trying to keep
	97	* overall latency low. The architecture specific idle is passed
	98	* a value to indicate the level of "idleness" of the system.
1394f032 BW	99	*/
	100	void cpu_idle(void)
	101	{
	102	/* endless idle loop with no priority at all */
	103	while (1) {
8b5f79f9 VM	104	void (*idle)(void) = pm_idle;
	105
	106	#ifdef CONFIG_HOTPLUG_CPU
	107	if (cpu_is_offline(smp_processor_id()))
	108	cpu_die();
	109	#endif
	110	if (!idle)
	111	idle = default_idle;
b8f8c3cf	112	tick_nohz_stop_sched_tick(1);
8b5f79f9 VM	113	while (!need_resched())
	114	idle();
	115	tick_nohz_restart_sched_tick();
1394f032 BW	116	preempt_enable_no_resched();
	117	schedule();
	118	preempt_disable();
	119	}
	120	}
	121
1394f032 BW	122	/* Fill in the fpu structure for a core dump. */
	123
	124	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpregs)
	125	{
	126	return 1;
	127	}
	128
	129	/*
	130	* This gets run with P1 containing the
	131	* function to call, and R1 containing
	132	* the "args". Note P0 is clobbered on the way here.
	133	*/
	134	void kernel_thread_helper(void);
	135	__asm__(".section .text\n"
	136	".align 4\n"
	137	"_kernel_thread_helper:\n\t"
	138	"\tsp += -12;\n\t"
	139	"\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous");
	140
	141	/*
	142	* Create a kernel thread.
	143	*/
	144	pid_t kernel_thread(int (fn) (void ), void *arg, unsigned long flags)
	145	{
	146	struct pt_regs regs;
	147
	148	memset(&regs, 0, sizeof(regs));
	149
	150	regs.r1 = (unsigned long)arg;
	151	regs.p1 = (unsigned long)fn;
	152	regs.pc = (unsigned long)kernel_thread_helper;
	153	regs.orig_p0 = -1;
	154	/* Set bit 2 to tell ret_from_fork we should be returning to kernel
	155	mode. */
	156	regs.ipend = 0x8002;
	157	__asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);
	158	return do_fork(flags \| CLONE_VM \| CLONE_UNTRACED, 0, &regs, 0, NULL,
	159	NULL);
	160	}
fe8015ce	161	EXPORT_SYMBOL(kernel_thread);
1394f032	162
d5ce528c MF	163	/*
	164	* Do necessary setup to start up a newly executed thread.
	165	*
	166	* pass the data segment into user programs if it exists,
	167	* it can't hurt anything as far as I can tell
	168	*/
	169	void start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
	170	{
	171	set_fs(USER_DS);
	172	regs->pc = new_ip;
	173	if (current->mm)
	174	regs->p5 = current->mm->start_data;
	175	#ifdef CONFIG_SMP
	176	task_thread_info(current)->l1_task_info.stack_start =
	177	(void *)current->mm->context.stack_start;
	178	task_thread_info(current)->l1_task_info.lowest_sp = (void *)new_sp;
	179	memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info,
	180	sizeof(*L1_SCRATCH_TASK_INFO));
	181	#endif
	182	wrusp(new_sp);
	183	}
	184	EXPORT_SYMBOL_GPL(start_thread);
	185
1394f032 BW	186	void flush_thread(void)
	187	{
	188	}
	189
	190	asmlinkage int bfin_vfork(struct pt_regs *regs)
	191	{
	192	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, rdusp(), regs, 0, NULL,
	193	NULL);
	194	}
	195
	196	asmlinkage int bfin_clone(struct pt_regs *regs)
	197	{
	198	unsigned long clone_flags;
	199	unsigned long newsp;
	200
8f65873e GY	201	#ifdef __ARCH_SYNC_CORE_DCACHE
	202	if (current->rt.nr_cpus_allowed == num_possible_cpus()) {
	203	current->cpus_allowed = cpumask_of_cpu(smp_processor_id());
	204	current->rt.nr_cpus_allowed = 1;
	205	}
	206	#endif
	207
1394f032 BW	208	/* syscall2 puts clone_flags in r0 and usp in r1 */
	209	clone_flags = regs->r0;
	210	newsp = regs->r1;
	211	if (!newsp)
	212	newsp = rdusp();
	213	else
	214	newsp -= 12;
	215	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
	216	}
	217
	218	int
6f2c55b8	219	copy_thread(unsigned long clone_flags,
1394f032 BW	220	unsigned long usp, unsigned long topstk,
	221	struct task_struct p, struct pt_regs regs)
	222	{
	223	struct pt_regs *childregs;
	224
	225	childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
	226	childregs = regs;
	227	childregs->r0 = 0;
	228
	229	p->thread.usp = usp;
	230	p->thread.ksp = (unsigned long)childregs;
	231	p->thread.pc = (unsigned long)ret_from_fork;
	232
	233	return 0;
	234	}
	235
1394f032 BW	236	/*
	237	* sys_execve() executes a new program.
	238	*/
	239
0ddeeca2	240	asmlinkage int sys_execve(char __user name, char __user __user argv, char __user __user *envp)
1394f032 BW	241	{
	242	int error;
	243	char *filename;
	244	struct pt_regs regs = (struct pt_regs )((&name) + 6);
	245
	246	lock_kernel();
	247	filename = getname(name);
	248	error = PTR_ERR(filename);
	249	if (IS_ERR(filename))
	250	goto out;
	251	error = do_execve(filename, argv, envp, regs);
	252	putname(filename);
1f83b8f1	253	out:
1394f032 BW	254	unlock_kernel();
	255	return error;
	256	}
	257
	258	unsigned long get_wchan(struct task_struct *p)
	259	{
	260	unsigned long fp, pc;
	261	unsigned long stack_page;
	262	int count = 0;
	263	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	264	return 0;
	265
	266	stack_page = (unsigned long)p;
	267	fp = p->thread.usp;
	268	do {
	269	if (fp < stack_page + sizeof(struct thread_info) \|\|
	270	fp >= 8184 + stack_page)
	271	return 0;
	272	pc = ((unsigned long *)fp)[1];
	273	if (!in_sched_functions(pc))
	274	return pc;
	275	fp = (unsigned long )fp;
	276	}
	277	while (count++ < 16);
	278	return 0;
	279	}
	280
7adfb58f BS	281	void finish_atomic_sections (struct pt_regs *regs)
7adfb58f BS	282	{
19d6d7d5	283	int __user up0 = (int __user )regs->p0;
0ddeeca2	284
7adfb58f BS	285	if (regs->pc < ATOMIC_SEQS_START \|\| regs->pc >= ATOMIC_SEQS_END)
	286	return;
	287
	288	switch (regs->pc) {
	289	case ATOMIC_XCHG32 + 2:
0ddeeca2	290	put_user(regs->r1, up0);
7adfb58f BS	291	regs->pc += 2;
	292	break;
	293
	294	case ATOMIC_CAS32 + 2:
	295	case ATOMIC_CAS32 + 4:
	296	if (regs->r0 == regs->r1)
0ddeeca2	297	put_user(regs->r2, up0);
7adfb58f BS	298	regs->pc = ATOMIC_CAS32 + 8;
	299	break;
	300	case ATOMIC_CAS32 + 6:
0ddeeca2	301	put_user(regs->r2, up0);
7adfb58f BS	302	regs->pc += 2;
	303	break;
	304
	305	case ATOMIC_ADD32 + 2:
	306	regs->r0 = regs->r1 + regs->r0;
	307	/* fall through */
	308	case ATOMIC_ADD32 + 4:
0ddeeca2	309	put_user(regs->r0, up0);
7adfb58f BS	310	regs->pc = ATOMIC_ADD32 + 6;
	311	break;
	312
	313	case ATOMIC_SUB32 + 2:
	314	regs->r0 = regs->r1 - regs->r0;
	315	/* fall through */
	316	case ATOMIC_SUB32 + 4:
0ddeeca2	317	put_user(regs->r0, up0);
7adfb58f BS	318	regs->pc = ATOMIC_SUB32 + 6;
	319	break;
	320
	321	case ATOMIC_IOR32 + 2:
	322	regs->r0 = regs->r1 \| regs->r0;
	323	/* fall through */
	324	case ATOMIC_IOR32 + 4:
0ddeeca2	325	put_user(regs->r0, up0);
7adfb58f BS	326	regs->pc = ATOMIC_IOR32 + 6;
	327	break;
	328
	329	case ATOMIC_AND32 + 2:
	330	regs->r0 = regs->r1 & regs->r0;
	331	/* fall through */
	332	case ATOMIC_AND32 + 4:
0ddeeca2	333	put_user(regs->r0, up0);
7adfb58f BS	334	regs->pc = ATOMIC_AND32 + 6;
	335	break;
	336
	337	case ATOMIC_XOR32 + 2:
	338	regs->r0 = regs->r1 ^ regs->r0;
	339	/* fall through */
	340	case ATOMIC_XOR32 + 4:
0ddeeca2	341	put_user(regs->r0, up0);
7adfb58f BS	342	regs->pc = ATOMIC_XOR32 + 6;
	343	break;
	344	}
	345	}
	346
e56e03b0 MF	347	static inline
	348	int in_mem(unsigned long addr, unsigned long size,
	349	unsigned long start, unsigned long end)
	350	{
	351	return addr >= start && addr + size <= end;
	352	}
	353	static inline
	354	int in_mem_const_off(unsigned long addr, unsigned long size, unsigned long off,
	355	unsigned long const_addr, unsigned long const_size)
	356	{
	357	return const_size &&
	358	in_mem(addr, size, const_addr + off, const_addr + const_size);
	359	}
	360	static inline
	361	int in_mem_const(unsigned long addr, unsigned long size,
	362	unsigned long const_addr, unsigned long const_size)
	363	{
	364	return in_mem_const_off(addr, 0, size, const_addr, const_size);
	365	}
	366	#define IN_ASYNC(bnum, bctlnum) \
	367	({ \
	368	(bfin_read_EBIU_AMGCTL() & 0xe) < ((bnum + 1) << 1) ? -EFAULT : \
	369	bfin_read_EBIU_AMBCTL##bctlnum() & B##bnum##RDYEN ? -EFAULT : \
	370	BFIN_MEM_ACCESS_CORE; \
	371	})
	372
	373	int bfin_mem_access_type(unsigned long addr, unsigned long size)
	374	{
	375	int cpu = raw_smp_processor_id();
	376
	377	/* Check that things do not wrap around */
	378	if (addr > ULONG_MAX - size)
	379	return -EFAULT;
	380
	381	if (in_mem(addr, size, FIXED_CODE_START, physical_mem_end))
	382	return BFIN_MEM_ACCESS_CORE;
	383
	384	if (in_mem_const(addr, size, L1_CODE_START, L1_CODE_LENGTH))
	385	return cpu == 0 ? BFIN_MEM_ACCESS_ITEST : BFIN_MEM_ACCESS_IDMA;
	386	if (in_mem_const(addr, size, L1_SCRATCH_START, L1_SCRATCH_LENGTH))
	387	return cpu == 0 ? BFIN_MEM_ACCESS_CORE_ONLY : -EFAULT;
	388	if (in_mem_const(addr, size, L1_DATA_A_START, L1_DATA_A_LENGTH))
	389	return cpu == 0 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
	390	if (in_mem_const(addr, size, L1_DATA_B_START, L1_DATA_B_LENGTH))
	391	return cpu == 0 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
	392	#ifdef COREB_L1_CODE_START
	393	if (in_mem_const(addr, size, COREB_L1_CODE_START, L1_CODE_LENGTH))
	394	return cpu == 1 ? BFIN_MEM_ACCESS_ITEST : BFIN_MEM_ACCESS_IDMA;
	395	if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))
	396	return cpu == 1 ? BFIN_MEM_ACCESS_CORE_ONLY : -EFAULT;
	397	if (in_mem_const(addr, size, COREB_L1_DATA_A_START, L1_DATA_A_LENGTH))
	398	return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
	399	if (in_mem_const(addr, size, COREB_L1_DATA_B_START, L1_DATA_B_LENGTH))
	400	return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
	401	#endif
	402	if (in_mem_const(addr, size, L2_START, L2_LENGTH))
	403	return BFIN_MEM_ACCESS_CORE;
	404
	405	if (addr >= SYSMMR_BASE)
	406	return BFIN_MEM_ACCESS_CORE_ONLY;
	407
	408	/* We can't read EBIU banks that aren't enabled or we end up hanging
	409	* on the access to the async space.
	410	*/
411	if (in_mem_const(addr, size, ASYNC_BANK0_BASE, ASYNC_BANK0_SIZE))
412	return IN_ASYNC(0, 0);
413	if (in_mem_const(addr, size, ASYNC_BANK1_BASE, ASYNC_BANK1_SIZE))
414	return IN_ASYNC(1, 0);
415	if (in_mem_const(addr, size, ASYNC_BANK2_BASE, ASYNC_BANK2_SIZE))
416	return IN_ASYNC(2, 1);
417	if (in_mem_const(addr, size, ASYNC_BANK3_BASE, ASYNC_BANK3_SIZE))
418	return IN_ASYNC(3, 1);
419
420	if (in_mem_const(addr, size, BOOT_ROM_START, BOOT_ROM_LENGTH))
421	return BFIN_MEM_ACCESS_CORE;
422	if (in_mem_const(addr, size, L1_ROM_START, L1_ROM_LENGTH))
423	return BFIN_MEM_ACCESS_DMA;
424
425	return -EFAULT;
426	}
427
1394f032	428	#if defined(CONFIG_ACCESS_CHECK)
a43b739f MF	429	#ifdef CONFIG_ACCESS_OK_L1
	430	__attribute__((l1_text))
	431	#endif
b03b08ba	432	/* Return 1 if access to memory range is OK, 0 otherwise */
1394f032 BW	433	int _access_ok(unsigned long addr, unsigned long size)
1394f032 BW	434	{
bc41bb11 BS	435	if (size == 0)
bc41bb11 BS	436	return 1;
e56e03b0 MF	437	/* Check that things do not wrap around */
e56e03b0 MF	438	if (addr > ULONG_MAX - size)
1394f032	439	return 0;
1f83b8f1	440	if (segment_eq(get_fs(), KERNEL_DS))
1394f032 BW	441	return 1;
1394f032 BW	442	#ifdef CONFIG_MTD_UCLINUX
e56e03b0 MF	443	if (1)
	444	#else
	445	if (0)
	446	#endif
	447	{
	448	if (in_mem(addr, size, memory_start, memory_end))
	449	return 1;
	450	if (in_mem(addr, size, memory_mtd_end, physical_mem_end))
	451	return 1;
	452	# ifndef CONFIG_ROMFS_ON_MTD
	453	if (0)
	454	# endif
	455	/* For XIP, allow user space to use pointers within the ROMFS. */
	456	if (in_mem(addr, size, memory_mtd_start, memory_mtd_end))
	457	return 1;
	458	} else {
	459	if (in_mem(addr, size, memory_start, physical_mem_end))
	460	return 1;
	461	}
	462
	463	if (in_mem(addr, size, (unsigned long)__init_begin, (unsigned long)__init_end))
1394f032	464	return 1;
d5adb029	465
e56e03b0	466	if (in_mem_const(addr, size, L1_CODE_START, L1_CODE_LENGTH))
d5adb029	467	return 1;
e56e03b0	468	if (in_mem_const_off(addr, size, _etext_l1 - _stext_l1, L1_CODE_START, L1_CODE_LENGTH))
1394f032	469	return 1;
e56e03b0	470	if (in_mem_const_off(addr, size, _ebss_l1 - _sdata_l1, L1_DATA_A_START, L1_DATA_A_LENGTH))
1394f032	471	return 1;
e56e03b0	472	if (in_mem_const_off(addr, size, _ebss_b_l1 - _sdata_b_l1, L1_DATA_B_START, L1_DATA_B_LENGTH))
1394f032	473	return 1;
e56e03b0 MF	474	#ifdef COREB_L1_CODE_START
e56e03b0 MF	475	if (in_mem_const(addr, size, COREB_L1_CODE_START, L1_CODE_LENGTH))
1394f032	476	return 1;
e56e03b0	477	if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))
1394f032	478	return 1;
e56e03b0	479	if (in_mem_const(addr, size, COREB_L1_DATA_A_START, L1_DATA_A_LENGTH))
1394f032	480	return 1;
e56e03b0	481	if (in_mem_const(addr, size, COREB_L1_DATA_B_START, L1_DATA_B_LENGTH))
b2c2f303	482	return 1;
1394f032	483	#endif
e56e03b0 MF	484	if (in_mem_const_off(addr, size, _ebss_l2 - _stext_l2, L2_START, L2_LENGTH))
	485	return 1;
	486
	487	if (in_mem_const(addr, size, BOOT_ROM_START, BOOT_ROM_LENGTH))
	488	return 1;
	489	if (in_mem_const(addr, size, L1_ROM_START, L1_ROM_LENGTH))
	490	return 1;
	491
1394f032 BW	492	return 0;
	493	}
	494	EXPORT_SYMBOL(_access_ok);
	495	#endif /* CONFIG_ACCESS_CHECK */