[linux-2.6-block.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>

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)
{
	local_irq_disable();
	if (!need_resched())
		idle_with_irq_disabled();

	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_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);
}

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;

	/* 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(int nr, 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;
	}
}

#if defined(CONFIG_ACCESS_CHECK)
/* 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;
	if (addr > (addr + size))
		return 0;
	if (segment_eq(get_fs(), KERNEL_DS))
		return 1;
#ifdef CONFIG_MTD_UCLINUX
	if (addr >= memory_start && (addr + size) <= memory_end)
		return 1;
	if (addr >= memory_mtd_end && (addr + size) <= physical_mem_end)
		return 1;

#ifdef CONFIG_ROMFS_MTD_FS
	/* For XIP, allow user space to use pointers within the ROMFS.  */
	if (addr >= memory_mtd_start && (addr + size) <= memory_mtd_end)
		return 1;
#endif
#else
	if (addr >= memory_start && (addr + size) <= physical_mem_end)
		return 1;
#endif
	if (addr >= (unsigned long)__init_begin &&
	    addr + size <= (unsigned long)__init_end)
		return 1;
	if (addr >= L1_SCRATCH_START
	    && addr + size <= L1_SCRATCH_START + L1_SCRATCH_LENGTH)
		return 1;
#if L1_CODE_LENGTH != 0
	if (addr >= L1_CODE_START + (_etext_l1 - _stext_l1)
	    && addr + size <= L1_CODE_START + L1_CODE_LENGTH)
		return 1;
#endif
#if L1_DATA_A_LENGTH != 0
	if (addr >= L1_DATA_A_START + (_ebss_l1 - _sdata_l1)
	    && addr + size <= L1_DATA_A_START + L1_DATA_A_LENGTH)
		return 1;
#endif
#if L1_DATA_B_LENGTH != 0
	if (addr >= L1_DATA_B_START
	    && addr + size <= L1_DATA_B_START + L1_DATA_B_LENGTH)
		return 1;
#endif
	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>
1394f032	42
1394f032 BW	43	asmlinkage void ret_from_fork(void);
	44
	45	/* Points to the SDRAM backup memory for the stack that is currently in
	46	* L1 scratchpad memory.
	47	*/
	48	void *current_l1_stack_save;
	49
	50	/* The number of tasks currently using a L1 stack area. The SRAM is
	51	* allocated/deallocated whenever this changes from/to zero.
	52	*/
	53	int nr_l1stack_tasks;
	54
	55	/* Start and length of the area in L1 scratchpad memory which we've allocated
	56	* for process stacks.
	57	*/
	58	void *l1_stack_base;
	59	unsigned long l1_stack_len;
	60
	61	/*
	62	* Powermanagement idle function, if any..
	63	*/
	64	void (*pm_idle)(void) = NULL;
	65	EXPORT_SYMBOL(pm_idle);
	66
	67	void (*pm_power_off)(void) = NULL;
	68	EXPORT_SYMBOL(pm_power_off);
	69
1394f032 BW	70	/*
	71	* The idle loop on BFIN
	72	*/
	73	#ifdef CONFIG_IDLE_L1
8b5f79f9	74	static void default_idle(void)__attribute__((l1_text));
1394f032 BW	75	void cpu_idle(void)__attribute__((l1_text));
	76	#endif
	77
8b5f79f9 VM	78	/*
	79	* This is our default idle handler. We need to disable
	80	* interrupts here to ensure we don't miss a wakeup call.
	81	*/
	82	static void default_idle(void)
1394f032	83	{
8b5f79f9 VM	84	local_irq_disable();
	85	if (!need_resched())
	86	idle_with_irq_disabled();
1394f032	87
8b5f79f9 VM	88	local_irq_enable();
8b5f79f9 VM	89	}
1394f032 BW	90
1394f032 BW	91	/*
8b5f79f9 VM	92	* The idle thread. We try to conserve power, while trying to keep
	93	* overall latency low. The architecture specific idle is passed
	94	* a value to indicate the level of "idleness" of the system.
1394f032 BW	95	*/
	96	void cpu_idle(void)
	97	{
	98	/* endless idle loop with no priority at all */
	99	while (1) {
8b5f79f9 VM	100	void (*idle)(void) = pm_idle;
	101
	102	#ifdef CONFIG_HOTPLUG_CPU
	103	if (cpu_is_offline(smp_processor_id()))
	104	cpu_die();
	105	#endif
	106	if (!idle)
	107	idle = default_idle;
b8f8c3cf	108	tick_nohz_stop_sched_tick(1);
8b5f79f9 VM	109	while (!need_resched())
	110	idle();
	111	tick_nohz_restart_sched_tick();
1394f032 BW	112	preempt_enable_no_resched();
	113	schedule();
	114	preempt_disable();
	115	}
	116	}
	117
1394f032 BW	118	/* Fill in the fpu structure for a core dump. */
	119
	120	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpregs)
	121	{
	122	return 1;
	123	}
	124
	125	/*
	126	* This gets run with P1 containing the
	127	* function to call, and R1 containing
	128	* the "args". Note P0 is clobbered on the way here.
	129	*/
	130	void kernel_thread_helper(void);
	131	__asm__(".section .text\n"
	132	".align 4\n"
	133	"_kernel_thread_helper:\n\t"
	134	"\tsp += -12;\n\t"
	135	"\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous");
	136
	137	/*
	138	* Create a kernel thread.
	139	*/
	140	pid_t kernel_thread(int (fn) (void ), void *arg, unsigned long flags)
	141	{
	142	struct pt_regs regs;
	143
	144	memset(&regs, 0, sizeof(regs));
	145
	146	regs.r1 = (unsigned long)arg;
	147	regs.p1 = (unsigned long)fn;
	148	regs.pc = (unsigned long)kernel_thread_helper;
	149	regs.orig_p0 = -1;
	150	/* Set bit 2 to tell ret_from_fork we should be returning to kernel
	151	mode. */
	152	regs.ipend = 0x8002;
	153	__asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);
	154	return do_fork(flags \| CLONE_VM \| CLONE_UNTRACED, 0, &regs, 0, NULL,
	155	NULL);
	156	}
	157
	158	void flush_thread(void)
	159	{
	160	}
	161
	162	asmlinkage int bfin_vfork(struct pt_regs *regs)
	163	{
	164	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, rdusp(), regs, 0, NULL,
	165	NULL);
	166	}
	167
	168	asmlinkage int bfin_clone(struct pt_regs *regs)
	169	{
	170	unsigned long clone_flags;
	171	unsigned long newsp;
	172
	173	/* syscall2 puts clone_flags in r0 and usp in r1 */
	174	clone_flags = regs->r0;
	175	newsp = regs->r1;
	176	if (!newsp)
	177	newsp = rdusp();
	178	else
	179	newsp -= 12;
	180	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
	181	}
182
183	int
184	copy_thread(int nr, unsigned long clone_flags,
185	unsigned long usp, unsigned long topstk,
186	struct task_struct p, struct pt_regs regs)
187	{
188	struct pt_regs *childregs;
189
190	childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
191	childregs = regs;
192	childregs->r0 = 0;
193
194	p->thread.usp = usp;
195	p->thread.ksp = (unsigned long)childregs;
196	p->thread.pc = (unsigned long)ret_from_fork;
197
198	return 0;
199	}
200
1394f032 BW	201	/*
	202	* sys_execve() executes a new program.
	203	*/
	204
0ddeeca2	205	asmlinkage int sys_execve(char __user name, char __user __user argv, char __user __user *envp)
1394f032 BW	206	{
	207	int error;
	208	char *filename;
	209	struct pt_regs regs = (struct pt_regs )((&name) + 6);
	210
	211	lock_kernel();
	212	filename = getname(name);
	213	error = PTR_ERR(filename);
	214	if (IS_ERR(filename))
	215	goto out;
	216	error = do_execve(filename, argv, envp, regs);
	217	putname(filename);
1f83b8f1	218	out:
1394f032 BW	219	unlock_kernel();
	220	return error;
	221	}
	222
	223	unsigned long get_wchan(struct task_struct *p)
	224	{
	225	unsigned long fp, pc;
	226	unsigned long stack_page;
	227	int count = 0;
	228	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	229	return 0;
	230
	231	stack_page = (unsigned long)p;
	232	fp = p->thread.usp;
	233	do {
	234	if (fp < stack_page + sizeof(struct thread_info) \|\|
	235	fp >= 8184 + stack_page)
	236	return 0;
	237	pc = ((unsigned long *)fp)[1];
	238	if (!in_sched_functions(pc))
	239	return pc;
	240	fp = (unsigned long )fp;
	241	}
	242	while (count++ < 16);
	243	return 0;
	244	}
	245
7adfb58f BS	246	void finish_atomic_sections (struct pt_regs *regs)
7adfb58f BS	247	{
19d6d7d5	248	int __user up0 = (int __user )regs->p0;
0ddeeca2	249
7adfb58f BS	250	if (regs->pc < ATOMIC_SEQS_START \|\| regs->pc >= ATOMIC_SEQS_END)
	251	return;
	252
	253	switch (regs->pc) {
	254	case ATOMIC_XCHG32 + 2:
0ddeeca2	255	put_user(regs->r1, up0);
7adfb58f BS	256	regs->pc += 2;
	257	break;
	258
	259	case ATOMIC_CAS32 + 2:
	260	case ATOMIC_CAS32 + 4:
	261	if (regs->r0 == regs->r1)
0ddeeca2	262	put_user(regs->r2, up0);
7adfb58f BS	263	regs->pc = ATOMIC_CAS32 + 8;
	264	break;
	265	case ATOMIC_CAS32 + 6:
0ddeeca2	266	put_user(regs->r2, up0);
7adfb58f BS	267	regs->pc += 2;
	268	break;
	269
	270	case ATOMIC_ADD32 + 2:
	271	regs->r0 = regs->r1 + regs->r0;
	272	/* fall through */
	273	case ATOMIC_ADD32 + 4:
0ddeeca2	274	put_user(regs->r0, up0);
7adfb58f BS	275	regs->pc = ATOMIC_ADD32 + 6;
	276	break;
	277
	278	case ATOMIC_SUB32 + 2:
	279	regs->r0 = regs->r1 - regs->r0;
	280	/* fall through */
	281	case ATOMIC_SUB32 + 4:
0ddeeca2	282	put_user(regs->r0, up0);
7adfb58f BS	283	regs->pc = ATOMIC_SUB32 + 6;
	284	break;
	285
	286	case ATOMIC_IOR32 + 2:
	287	regs->r0 = regs->r1 \| regs->r0;
	288	/* fall through */
	289	case ATOMIC_IOR32 + 4:
0ddeeca2	290	put_user(regs->r0, up0);
7adfb58f BS	291	regs->pc = ATOMIC_IOR32 + 6;
	292	break;
	293
	294	case ATOMIC_AND32 + 2:
	295	regs->r0 = regs->r1 & regs->r0;
	296	/* fall through */
	297	case ATOMIC_AND32 + 4:
0ddeeca2	298	put_user(regs->r0, up0);
7adfb58f BS	299	regs->pc = ATOMIC_AND32 + 6;
	300	break;
	301
	302	case ATOMIC_XOR32 + 2:
	303	regs->r0 = regs->r1 ^ regs->r0;
	304	/* fall through */
	305	case ATOMIC_XOR32 + 4:
0ddeeca2	306	put_user(regs->r0, up0);
7adfb58f BS	307	regs->pc = ATOMIC_XOR32 + 6;
	308	break;
	309	}
	310	}
	311
1394f032	312	#if defined(CONFIG_ACCESS_CHECK)
b03b08ba	313	/* Return 1 if access to memory range is OK, 0 otherwise */
1394f032 BW	314	int _access_ok(unsigned long addr, unsigned long size)
1394f032 BW	315	{
bc41bb11 BS	316	if (size == 0)
bc41bb11 BS	317	return 1;
1394f032 BW	318	if (addr > (addr + size))
1394f032 BW	319	return 0;
1f83b8f1	320	if (segment_eq(get_fs(), KERNEL_DS))
1394f032 BW	321	return 1;
	322	#ifdef CONFIG_MTD_UCLINUX
	323	if (addr >= memory_start && (addr + size) <= memory_end)
	324	return 1;
	325	if (addr >= memory_mtd_end && (addr + size) <= physical_mem_end)
	326	return 1;
d5adb029 BS	327
	328	#ifdef CONFIG_ROMFS_MTD_FS
	329	/* For XIP, allow user space to use pointers within the ROMFS. */
	330	if (addr >= memory_mtd_start && (addr + size) <= memory_mtd_end)
	331	return 1;
	332	#endif
1394f032 BW	333	#else
	334	if (addr >= memory_start && (addr + size) <= physical_mem_end)
	335	return 1;
	336	#endif
	337	if (addr >= (unsigned long)__init_begin &&
	338	addr + size <= (unsigned long)__init_end)
	339	return 1;
	340	if (addr >= L1_SCRATCH_START
	341	&& addr + size <= L1_SCRATCH_START + L1_SCRATCH_LENGTH)
	342	return 1;
	343	#if L1_CODE_LENGTH != 0
	344	if (addr >= L1_CODE_START + (_etext_l1 - _stext_l1)
	345	&& addr + size <= L1_CODE_START + L1_CODE_LENGTH)
	346	return 1;
	347	#endif
	348	#if L1_DATA_A_LENGTH != 0
	349	if (addr >= L1_DATA_A_START + (_ebss_l1 - _sdata_l1)
	350	&& addr + size <= L1_DATA_A_START + L1_DATA_A_LENGTH)
	351	return 1;
	352	#endif
	353	#if L1_DATA_B_LENGTH != 0
	354	if (addr >= L1_DATA_B_START
	355	&& addr + size <= L1_DATA_B_START + L1_DATA_B_LENGTH)
	356	return 1;
	357	#endif
	358	return 0;
	359	}
	360	EXPORT_SYMBOL(_access_ok);
	361	#endif /* CONFIG_ACCESS_CHECK */