[linux-2.6] / 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);

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;
	}
}

#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_ON_MTD
	/* 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 >= get_l1_scratch_start()
	    && addr + size <= get_l1_scratch_start() + L1_SCRATCH_LENGTH)
		return 1;
#if L1_CODE_LENGTH != 0
	if (addr >= get_l1_code_start() + (_etext_l1 - _stext_l1)
	    && addr + size <= get_l1_code_start() + L1_CODE_LENGTH)
		return 1;
#endif
#if L1_DATA_A_LENGTH != 0
	if (addr >= get_l1_data_a_start() + (_ebss_l1 - _sdata_l1)
	    && addr + size <= get_l1_data_a_start() + L1_DATA_A_LENGTH)
		return 1;
#endif
#if L1_DATA_B_LENGTH != 0
	if (addr >= get_l1_data_b_start() + (_ebss_b_l1 - _sdata_b_l1)
	    && addr + size <= get_l1_data_b_start() + L1_DATA_B_LENGTH)
		return 1;
#endif
#if L2_LENGTH != 0
	if (addr >= L2_START + (_ebss_l2 - _stext_l2)
	    && addr + size <= L2_START + L2_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>
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 BW	162
	163	void flush_thread(void)
	164	{
	165	}
	166
	167	asmlinkage int bfin_vfork(struct pt_regs *regs)
	168	{
	169	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, rdusp(), regs, 0, NULL,
	170	NULL);
	171	}
	172
	173	asmlinkage int bfin_clone(struct pt_regs *regs)
	174	{
	175	unsigned long clone_flags;
	176	unsigned long newsp;
	177
8f65873e GY	178	#ifdef __ARCH_SYNC_CORE_DCACHE
	179	if (current->rt.nr_cpus_allowed == num_possible_cpus()) {
	180	current->cpus_allowed = cpumask_of_cpu(smp_processor_id());
	181	current->rt.nr_cpus_allowed = 1;
	182	}
	183	#endif
	184
1394f032 BW	185	/* syscall2 puts clone_flags in r0 and usp in r1 */
	186	clone_flags = regs->r0;
	187	newsp = regs->r1;
	188	if (!newsp)
	189	newsp = rdusp();
	190	else
	191	newsp -= 12;
	192	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
	193	}
	194
	195	int
6f2c55b8	196	copy_thread(unsigned long clone_flags,
1394f032 BW	197	unsigned long usp, unsigned long topstk,
	198	struct task_struct p, struct pt_regs regs)
	199	{
	200	struct pt_regs *childregs;
	201
	202	childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
	203	childregs = regs;
	204	childregs->r0 = 0;
	205
	206	p->thread.usp = usp;
	207	p->thread.ksp = (unsigned long)childregs;
	208	p->thread.pc = (unsigned long)ret_from_fork;
	209
	210	return 0;
	211	}
	212
1394f032 BW	213	/*
	214	* sys_execve() executes a new program.
	215	*/
	216
0ddeeca2	217	asmlinkage int sys_execve(char __user name, char __user __user argv, char __user __user *envp)
1394f032 BW	218	{
	219	int error;
	220	char *filename;
	221	struct pt_regs regs = (struct pt_regs )((&name) + 6);
	222
	223	lock_kernel();
	224	filename = getname(name);
	225	error = PTR_ERR(filename);
	226	if (IS_ERR(filename))
	227	goto out;
	228	error = do_execve(filename, argv, envp, regs);
	229	putname(filename);
1f83b8f1	230	out:
1394f032 BW	231	unlock_kernel();
	232	return error;
	233	}
	234
	235	unsigned long get_wchan(struct task_struct *p)
	236	{
	237	unsigned long fp, pc;
	238	unsigned long stack_page;
	239	int count = 0;
	240	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	241	return 0;
	242
	243	stack_page = (unsigned long)p;
	244	fp = p->thread.usp;
	245	do {
	246	if (fp < stack_page + sizeof(struct thread_info) \|\|
	247	fp >= 8184 + stack_page)
	248	return 0;
	249	pc = ((unsigned long *)fp)[1];
	250	if (!in_sched_functions(pc))
	251	return pc;
	252	fp = (unsigned long )fp;
	253	}
	254	while (count++ < 16);
	255	return 0;
	256	}
	257
7adfb58f BS	258	void finish_atomic_sections (struct pt_regs *regs)
7adfb58f BS	259	{
19d6d7d5	260	int __user up0 = (int __user )regs->p0;
0ddeeca2	261
7adfb58f BS	262	if (regs->pc < ATOMIC_SEQS_START \|\| regs->pc >= ATOMIC_SEQS_END)
	263	return;
	264
	265	switch (regs->pc) {
	266	case ATOMIC_XCHG32 + 2:
0ddeeca2	267	put_user(regs->r1, up0);
7adfb58f BS	268	regs->pc += 2;
	269	break;
	270
	271	case ATOMIC_CAS32 + 2:
	272	case ATOMIC_CAS32 + 4:
	273	if (regs->r0 == regs->r1)
0ddeeca2	274	put_user(regs->r2, up0);
7adfb58f BS	275	regs->pc = ATOMIC_CAS32 + 8;
	276	break;
	277	case ATOMIC_CAS32 + 6:
0ddeeca2	278	put_user(regs->r2, up0);
7adfb58f BS	279	regs->pc += 2;
	280	break;
	281
	282	case ATOMIC_ADD32 + 2:
	283	regs->r0 = regs->r1 + regs->r0;
	284	/* fall through */
	285	case ATOMIC_ADD32 + 4:
0ddeeca2	286	put_user(regs->r0, up0);
7adfb58f BS	287	regs->pc = ATOMIC_ADD32 + 6;
	288	break;
	289
	290	case ATOMIC_SUB32 + 2:
	291	regs->r0 = regs->r1 - regs->r0;
	292	/* fall through */
	293	case ATOMIC_SUB32 + 4:
0ddeeca2	294	put_user(regs->r0, up0);
7adfb58f BS	295	regs->pc = ATOMIC_SUB32 + 6;
	296	break;
	297
	298	case ATOMIC_IOR32 + 2:
	299	regs->r0 = regs->r1 \| regs->r0;
	300	/* fall through */
	301	case ATOMIC_IOR32 + 4:
0ddeeca2	302	put_user(regs->r0, up0);
7adfb58f BS	303	regs->pc = ATOMIC_IOR32 + 6;
	304	break;
	305
	306	case ATOMIC_AND32 + 2:
	307	regs->r0 = regs->r1 & regs->r0;
	308	/* fall through */
	309	case ATOMIC_AND32 + 4:
0ddeeca2	310	put_user(regs->r0, up0);
7adfb58f BS	311	regs->pc = ATOMIC_AND32 + 6;
	312	break;
	313
	314	case ATOMIC_XOR32 + 2:
	315	regs->r0 = regs->r1 ^ regs->r0;
	316	/* fall through */
	317	case ATOMIC_XOR32 + 4:
0ddeeca2	318	put_user(regs->r0, up0);
7adfb58f BS	319	regs->pc = ATOMIC_XOR32 + 6;
	320	break;
	321	}
	322	}
	323
1394f032	324	#if defined(CONFIG_ACCESS_CHECK)
b03b08ba	325	/* Return 1 if access to memory range is OK, 0 otherwise */
1394f032 BW	326	int _access_ok(unsigned long addr, unsigned long size)
1394f032 BW	327	{
bc41bb11 BS	328	if (size == 0)
bc41bb11 BS	329	return 1;
1394f032 BW	330	if (addr > (addr + size))
1394f032 BW	331	return 0;
1f83b8f1	332	if (segment_eq(get_fs(), KERNEL_DS))
1394f032 BW	333	return 1;
	334	#ifdef CONFIG_MTD_UCLINUX
	335	if (addr >= memory_start && (addr + size) <= memory_end)
	336	return 1;
	337	if (addr >= memory_mtd_end && (addr + size) <= physical_mem_end)
	338	return 1;
d5adb029	339
158772c2	340	#ifdef CONFIG_ROMFS_ON_MTD
d5adb029 BS	341	/* For XIP, allow user space to use pointers within the ROMFS. */
	342	if (addr >= memory_mtd_start && (addr + size) <= memory_mtd_end)
	343	return 1;
	344	#endif
1394f032 BW	345	#else
	346	if (addr >= memory_start && (addr + size) <= physical_mem_end)
	347	return 1;
	348	#endif
	349	if (addr >= (unsigned long)__init_begin &&
	350	addr + size <= (unsigned long)__init_end)
	351	return 1;
8f65873e GY	352	if (addr >= get_l1_scratch_start()
8f65873e GY	353	&& addr + size <= get_l1_scratch_start() + L1_SCRATCH_LENGTH)
1394f032 BW	354	return 1;
1394f032 BW	355	#if L1_CODE_LENGTH != 0
8f65873e GY	356	if (addr >= get_l1_code_start() + (_etext_l1 - _stext_l1)
8f65873e GY	357	&& addr + size <= get_l1_code_start() + L1_CODE_LENGTH)
1394f032 BW	358	return 1;
	359	#endif
	360	#if L1_DATA_A_LENGTH != 0
8f65873e GY	361	if (addr >= get_l1_data_a_start() + (_ebss_l1 - _sdata_l1)
8f65873e GY	362	&& addr + size <= get_l1_data_a_start() + L1_DATA_A_LENGTH)
1394f032 BW	363	return 1;
	364	#endif
	365	#if L1_DATA_B_LENGTH != 0
8f65873e GY	366	if (addr >= get_l1_data_b_start() + (_ebss_b_l1 - _sdata_b_l1)
8f65873e GY	367	&& addr + size <= get_l1_data_b_start() + L1_DATA_B_LENGTH)
1394f032	368	return 1;
b2c2f303 JZ	369	#endif
	370	#if L2_LENGTH != 0
	371	if (addr >= L2_START + (_ebss_l2 - _stext_l2)
	372	&& addr + size <= L2_START + L2_LENGTH)
	373	return 1;
1394f032 BW	374	#endif
	375	return 0;
	376	}
	377	EXPORT_SYMBOL(_access_ok);
	378	#endif /* CONFIG_ACCESS_CHECK */