[linux-2.6-block.git] / arch / sh / mm / tlbflush_64.c

/*
 * arch/sh/mm/tlb-flush_64.c
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003  Richard Curnow (/proc/tlb, bug fixes)
 * Copyright (C) 2003  Paul Mundt
 *
 * 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/signal.h>
#include <linux/rwsem.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/tlb.h>
#include <asm/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>

extern void die(const char *,struct pt_regs *,long);

#define PFLAG(val,flag)   (( (val) & (flag) ) ? #flag : "" )
#define PPROT(flag) PFLAG(pgprot_val(prot),flag)

static inline void print_prots(pgprot_t prot)
{
	printk("prot is 0x%08lx\n",pgprot_val(prot));

	printk("%s %s %s %s %s\n",PPROT(_PAGE_SHARED),PPROT(_PAGE_READ),
	       PPROT(_PAGE_EXECUTE),PPROT(_PAGE_WRITE),PPROT(_PAGE_USER));
}

static inline void print_vma(struct vm_area_struct *vma)
{
	printk("vma start 0x%08lx\n", vma->vm_start);
	printk("vma end   0x%08lx\n", vma->vm_end);

	print_prots(vma->vm_page_prot);
	printk("vm_flags 0x%08lx\n", vma->vm_flags);
}

static inline void print_task(struct task_struct *tsk)
{
	printk("Task pid %d\n", task_pid_nr(tsk));
}

static pte_t *lookup_pte(struct mm_struct *mm, unsigned long address)
{
	pgd_t *dir;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	pte_t entry;

	dir = pgd_offset(mm, address);
	if (pgd_none(*dir))
		return NULL;

	pud = pud_offset(dir, address);
	if (pud_none(*pud))
		return NULL;

	pmd = pmd_offset(pud, address);
	if (pmd_none(*pmd))
		return NULL;

	pte = pte_offset_kernel(pmd, address);
	entry = *pte;
	if (pte_none(entry) || !pte_present(entry))
		return NULL;

	return pte;
}

/*
 * This routine handles page faults.  It determines the address,
 * and the problem, and then passes it off to one of the appropriate
 * routines.
 */
asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
			      unsigned long textaccess, unsigned long address)
{
	struct task_struct *tsk;
	struct mm_struct *mm;
	struct vm_area_struct * vma;
	const struct exception_table_entry *fixup;
	pte_t *pte;
	int fault;

	/* SIM
	 * Note this is now called with interrupts still disabled
	 * This is to cope with being called for a missing IO port
	 * address with interrupts disabled. This should be fixed as
	 * soon as we have a better 'fast path' miss handler.
	 *
	 * Plus take care how you try and debug this stuff.
	 * For example, writing debug data to a port which you
	 * have just faulted on is not going to work.
	 */

	tsk = current;
	mm = tsk->mm;

	/* Not an IO address, so reenable interrupts */
	local_irq_enable();

	/*
	 * If we're in an interrupt or have no user
	 * context, we must not take the fault..
	 */
	if (in_atomic() || !mm)
		goto no_context;

	/* TLB misses upon some cache flushes get done under cli() */
	down_read(&mm->mmap_sem);

	vma = find_vma(mm, address);

	if (!vma) {
#ifdef DEBUG_FAULT
		print_task(tsk);
		printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n",
		       __func__, __LINE__,
		       address,regs->pc,textaccess,writeaccess);
		show_regs(regs);
#endif
		goto bad_area;
	}
	if (vma->vm_start <= address) {
		goto good_area;
	}

	if (!(vma->vm_flags & VM_GROWSDOWN)) {
#ifdef DEBUG_FAULT
		print_task(tsk);
		printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n",
		       __func__, __LINE__,
		       address,regs->pc,textaccess,writeaccess);
		show_regs(regs);

		print_vma(vma);
#endif
		goto bad_area;
	}
	if (expand_stack(vma, address)) {
#ifdef DEBUG_FAULT
		print_task(tsk);
		printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n",
		       __func__, __LINE__,
		       address,regs->pc,textaccess,writeaccess);
		show_regs(regs);
#endif
		goto bad_area;
	}
/*
 * Ok, we have a good vm_area for this memory access, so
 * we can handle it..
 */
good_area:
	if (textaccess) {
		if (!(vma->vm_flags & VM_EXEC))
			goto bad_area;
	} else {
		if (writeaccess) {
			if (!(vma->vm_flags & VM_WRITE))
				goto bad_area;
		} else {
			if (!(vma->vm_flags & VM_READ))
				goto bad_area;
		}
	}

	/*
	 * If for any reason at all we couldn't handle the fault,
	 * make sure we exit gracefully rather than endlessly redo
	 * the fault.
	 */
survive:
	fault = handle_mm_fault(mm, vma, address, writeaccess ? FAULT_FLAG_WRITE : 0);
	if (unlikely(fault & VM_FAULT_ERROR)) {
		if (fault & VM_FAULT_OOM)
			goto out_of_memory;
		else if (fault & VM_FAULT_SIGBUS)
			goto do_sigbus;
		BUG();
	}
	if (fault & VM_FAULT_MAJOR)
		tsk->maj_flt++;
	else
		tsk->min_flt++;

	/* If we get here, the page fault has been handled.  Do the TLB refill
	   now from the newly-setup PTE, to avoid having to fault again right
	   away on the same instruction. */
	pte = lookup_pte (mm, address);
	if (!pte) {
		/* From empirical evidence, we can get here, due to
		   !pte_present(pte).  (e.g. if a swap-in occurs, and the page
		   is swapped back out again before the process that wanted it
		   gets rescheduled?) */
		goto no_pte;
	}

	__do_tlb_refill(address, textaccess, pte);

no_pte:

	up_read(&mm->mmap_sem);
	return;

/*
 * Something tried to access memory that isn't in our memory map..
 * Fix it, but check if it's kernel or user first..
 */
bad_area:
#ifdef DEBUG_FAULT
	printk("fault:bad area\n");
#endif
	up_read(&mm->mmap_sem);

	if (user_mode(regs)) {
		static int count=0;
		siginfo_t info;
		if (count < 4) {
			/* This is really to help debug faults when starting
			 * usermode, so only need a few */
			count++;
			printk("user mode bad_area address=%08lx pid=%d (%s) pc=%08lx\n",
				address, task_pid_nr(current), current->comm,
				(unsigned long) regs->pc);
#if 0
			show_regs(regs);
#endif
		}
		if (is_global_init(tsk)) {
			panic("INIT had user mode bad_area\n");
		}
		tsk->thread.address = address;
		tsk->thread.error_code = writeaccess;
		info.si_signo = SIGSEGV;
		info.si_errno = 0;
		info.si_addr = (void *) address;
		force_sig_info(SIGSEGV, &info, tsk);
		return;
	}

no_context:
#ifdef DEBUG_FAULT
	printk("fault:No context\n");
#endif
	/* Are we prepared to handle this kernel fault?  */
	fixup = search_exception_tables(regs->pc);
	if (fixup) {
		regs->pc = fixup->fixup;
		return;
	}

/*
 * Oops. The kernel tried to access some bad page. We'll have to
 * terminate things with extreme prejudice.
 *
 */
	if (address < PAGE_SIZE)
		printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
	else
		printk(KERN_ALERT "Unable to handle kernel paging request");
	printk(" at virtual address %08lx\n", address);
	printk(KERN_ALERT "pc = %08Lx%08Lx\n", regs->pc >> 32, regs->pc & 0xffffffff);
	die("Oops", regs, writeaccess);
	do_exit(SIGKILL);

/*
 * We ran out of memory, or some other thing happened to us that made
 * us unable to handle the page fault gracefully.
 */
out_of_memory:
	if (is_global_init(current)) {
		panic("INIT out of memory\n");
		yield();
		goto survive;
	}
	printk("fault:Out of memory\n");
	up_read(&mm->mmap_sem);
	if (is_global_init(current)) {
		yield();
		down_read(&mm->mmap_sem);
		goto survive;
	}
	printk("VM: killing process %s\n", tsk->comm);
	if (user_mode(regs))
		do_group_exit(SIGKILL);
	goto no_context;

do_sigbus:
	printk("fault:Do sigbus\n");
	up_read(&mm->mmap_sem);

	/*
	 * Send a sigbus, regardless of whether we were in kernel
	 * or user mode.
	 */
	tsk->thread.address = address;
	tsk->thread.error_code = writeaccess;
	tsk->thread.trap_no = 14;
	force_sig(SIGBUS, tsk);

	/* Kernel mode? Handle exceptions or die */
	if (!user_mode(regs))
		goto no_context;
}

void update_mmu_cache(struct vm_area_struct * vma,
			unsigned long address, pte_t pte)
{
	/*
	 * This appears to get called once for every pte entry that gets
	 * established => I don't think it's efficient to try refilling the
	 * TLBs with the pages - some may not get accessed even.  Also, for
	 * executable pages, it is impossible to determine reliably here which
	 * TLB they should be mapped into (or both even).
	 *
	 * So, just do nothing here and handle faults on demand.  In the
	 * TLBMISS handling case, the refill is now done anyway after the pte
	 * has been fixed up, so that deals with most useful cases.
	 */
}

void local_flush_tlb_one(unsigned long asid, unsigned long page)
{
	unsigned long long match, pteh=0, lpage;
	unsigned long tlb;

	/*
	 * Sign-extend based on neff.
	 */
	lpage = (page & NEFF_SIGN) ? (page | NEFF_MASK) : page;
	match = (asid << PTEH_ASID_SHIFT) | PTEH_VALID;
	match |= lpage;

	for_each_itlb_entry(tlb) {
		asm volatile ("getcfg	%1, 0, %0"
			      : "=r" (pteh)
			      : "r" (tlb) );

		if (pteh == match) {
			__flush_tlb_slot(tlb);
			break;
		}
	}

	for_each_dtlb_entry(tlb) {
		asm volatile ("getcfg	%1, 0, %0"
			      : "=r" (pteh)
			      : "r" (tlb) );

		if (pteh == match) {
			__flush_tlb_slot(tlb);
			break;
		}

	}
}

void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
	unsigned long flags;

	if (vma->vm_mm) {
		page &= PAGE_MASK;
		local_irq_save(flags);
		local_flush_tlb_one(get_asid(), page);
		local_irq_restore(flags);
	}
}

void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
			   unsigned long end)
{
	unsigned long flags;
	unsigned long long match, pteh=0, pteh_epn, pteh_low;
	unsigned long tlb;
	unsigned int cpu = smp_processor_id();
	struct mm_struct *mm;

	mm = vma->vm_mm;
	if (cpu_context(cpu, mm) == NO_CONTEXT)
		return;

	local_irq_save(flags);

	start &= PAGE_MASK;
	end &= PAGE_MASK;

	match = (cpu_asid(cpu, mm) << PTEH_ASID_SHIFT) | PTEH_VALID;

	/* Flush ITLB */
	for_each_itlb_entry(tlb) {
		asm volatile ("getcfg	%1, 0, %0"
			      : "=r" (pteh)
			      : "r" (tlb) );

		pteh_epn = pteh & PAGE_MASK;
		pteh_low = pteh & ~PAGE_MASK;

		if (pteh_low == match && pteh_epn >= start && pteh_epn <= end)
			__flush_tlb_slot(tlb);
	}

	/* Flush DTLB */
	for_each_dtlb_entry(tlb) {
		asm volatile ("getcfg	%1, 0, %0"
			      : "=r" (pteh)
			      : "r" (tlb) );

		pteh_epn = pteh & PAGE_MASK;
		pteh_low = pteh & ~PAGE_MASK;

		if (pteh_low == match && pteh_epn >= start && pteh_epn <= end)
			__flush_tlb_slot(tlb);
	}

	local_irq_restore(flags);
}

void local_flush_tlb_mm(struct mm_struct *mm)
{
	unsigned long flags;
	unsigned int cpu = smp_processor_id();

	if (cpu_context(cpu, mm) == NO_CONTEXT)
		return;

	local_irq_save(flags);

	cpu_context(cpu, mm) = NO_CONTEXT;
	if (mm == current->mm)
		activate_context(mm, cpu);

	local_irq_restore(flags);
}

void local_flush_tlb_all(void)
{
	/* Invalidate all, including shared pages, excluding fixed TLBs */
	unsigned long flags, tlb;

	local_irq_save(flags);

	/* Flush each ITLB entry */
	for_each_itlb_entry(tlb)
		__flush_tlb_slot(tlb);

	/* Flush each DTLB entry */
	for_each_dtlb_entry(tlb)
		__flush_tlb_slot(tlb);

	local_irq_restore(flags);
}

void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
        /* FIXME: Optimize this later.. */
        flush_tlb_all();
}
Commit	Line	Data
1da177e4	1	/*
3eeffb32	2	* arch/sh/mm/tlb-flush_64.c
1da177e4 LT	3	*
	4	* Copyright (C) 2000, 2001 Paolo Alberelli
	5	* Copyright (C) 2003 Richard Curnow (/proc/tlb, bug fixes)
	6	* Copyright (C) 2003 Paul Mundt
	7	*
3eeffb32 PM	8	* This file is subject to the terms and conditions of the GNU General Public
	9	* License. See the file "COPYING" in the main directory of this archive
	10	* for more details.
1da177e4	11	*/
1da177e4 LT	12	#include <linux/signal.h>
	13	#include <linux/rwsem.h>
	14	#include <linux/sched.h>
	15	#include <linux/kernel.h>
	16	#include <linux/errno.h>
	17	#include <linux/string.h>
	18	#include <linux/types.h>
	19	#include <linux/ptrace.h>
	20	#include <linux/mman.h>
	21	#include <linux/mm.h>
	22	#include <linux/smp.h>
1da177e4	23	#include <linux/interrupt.h>
1da177e4 LT	24	#include <asm/system.h>
	25	#include <asm/io.h>
	26	#include <asm/tlb.h>
	27	#include <asm/uaccess.h>
	28	#include <asm/pgalloc.h>
	29	#include <asm/mmu_context.h>
1da177e4 LT	30
	31	extern void die(const char ,struct pt_regs ,long);
	32
	33	#define PFLAG(val,flag) (( (val) & (flag) ) ? #flag : "" )
	34	#define PPROT(flag) PFLAG(pgprot_val(prot),flag)
	35
	36	static inline void print_prots(pgprot_t prot)
	37	{
	38	printk("prot is 0x%08lx\n",pgprot_val(prot));
	39
	40	printk("%s %s %s %s %s\n",PPROT(_PAGE_SHARED),PPROT(_PAGE_READ),
	41	PPROT(_PAGE_EXECUTE),PPROT(_PAGE_WRITE),PPROT(_PAGE_USER));
	42	}
	43
	44	static inline void print_vma(struct vm_area_struct *vma)
	45	{
	46	printk("vma start 0x%08lx\n", vma->vm_start);
	47	printk("vma end 0x%08lx\n", vma->vm_end);
	48
	49	print_prots(vma->vm_page_prot);
	50	printk("vm_flags 0x%08lx\n", vma->vm_flags);
	51	}
	52
	53	static inline void print_task(struct task_struct *tsk)
	54	{
19c5870c	55	printk("Task pid %d\n", task_pid_nr(tsk));
1da177e4 LT	56	}
	57
	58	static pte_t lookup_pte(struct mm_struct mm, unsigned long address)
	59	{
	60	pgd_t *dir;
3eeffb32	61	pud_t *pud;
1da177e4 LT	62	pmd_t *pmd;
	63	pte_t *pte;
	64	pte_t entry;
	65
	66	dir = pgd_offset(mm, address);
3eeffb32	67	if (pgd_none(*dir))
1da177e4	68	return NULL;
1da177e4	69
3eeffb32 PM	70	pud = pud_offset(dir, address);
	71	if (pud_none(*pud))
	72	return NULL;
	73
	74	pmd = pmd_offset(pud, address);
	75	if (pmd_none(*pmd))
1da177e4	76	return NULL;
1da177e4 LT	77
	78	pte = pte_offset_kernel(pmd, address);
	79	entry = *pte;
3eeffb32	80	if (pte_none(entry) \|\| !pte_present(entry))
1da177e4	81	return NULL;
1da177e4 LT	82
	83	return pte;
	84	}
	85
	86	/*
	87	* This routine handles page faults. It determines the address,
	88	* and the problem, and then passes it off to one of the appropriate
	89	* routines.
	90	*/
	91	asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
	92	unsigned long textaccess, unsigned long address)
	93	{
	94	struct task_struct *tsk;
	95	struct mm_struct *mm;
	96	struct vm_area_struct * vma;
	97	const struct exception_table_entry *fixup;
	98	pte_t *pte;
83c54070	99	int fault;
1da177e4	100
1da177e4 LT	101	/* SIM
	102	* Note this is now called with interrupts still disabled
	103	* This is to cope with being called for a missing IO port
0a354775	104	* address with interrupts disabled. This should be fixed as
1da177e4 LT	105	* soon as we have a better 'fast path' miss handler.
	106	*
	107	* Plus take care how you try and debug this stuff.
	108	* For example, writing debug data to a port which you
	109	* have just faulted on is not going to work.
	110	*/
	111
	112	tsk = current;
	113	mm = tsk->mm;
	114
	115	/* Not an IO address, so reenable interrupts */
	116	local_irq_enable();
	117
	118	/*
	119	* If we're in an interrupt or have no user
	120	* context, we must not take the fault..
	121	*/
6edaf68a	122	if (in_atomic() \|\| !mm)
1da177e4 LT	123	goto no_context;
	124
	125	/* TLB misses upon some cache flushes get done under cli() */
	126	down_read(&mm->mmap_sem);
	127
	128	vma = find_vma(mm, address);
	129
	130	if (!vma) {
	131	#ifdef DEBUG_FAULT
	132	print_task(tsk);
	133	printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n",
866e6b9e	134	__func__, __LINE__,
1da177e4 LT	135	address,regs->pc,textaccess,writeaccess);
	136	show_regs(regs);
	137	#endif
	138	goto bad_area;
	139	}
	140	if (vma->vm_start <= address) {
	141	goto good_area;
	142	}
	143
	144	if (!(vma->vm_flags & VM_GROWSDOWN)) {
	145	#ifdef DEBUG_FAULT
	146	print_task(tsk);
	147	printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n",
866e6b9e	148	__func__, __LINE__,
1da177e4 LT	149	address,regs->pc,textaccess,writeaccess);
	150	show_regs(regs);
	151
	152	print_vma(vma);
	153	#endif
	154	goto bad_area;
	155	}
	156	if (expand_stack(vma, address)) {
	157	#ifdef DEBUG_FAULT
	158	print_task(tsk);
	159	printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n",
866e6b9e	160	__func__, __LINE__,
1da177e4 LT	161	address,regs->pc,textaccess,writeaccess);
	162	show_regs(regs);
	163	#endif
	164	goto bad_area;
	165	}
	166	/*
	167	* Ok, we have a good vm_area for this memory access, so
	168	* we can handle it..
	169	*/
	170	good_area:
	171	if (textaccess) {
	172	if (!(vma->vm_flags & VM_EXEC))
	173	goto bad_area;
	174	} else {
	175	if (writeaccess) {
	176	if (!(vma->vm_flags & VM_WRITE))
	177	goto bad_area;
	178	} else {
	179	if (!(vma->vm_flags & VM_READ))
	180	goto bad_area;
	181	}
	182	}
	183
	184	/*
	185	* If for any reason at all we couldn't handle the fault,
	186	* make sure we exit gracefully rather than endlessly redo
	187	* the fault.
	188	*/
	189	survive:
d06063cc	190	fault = handle_mm_fault(mm, vma, address, writeaccess ? FAULT_FLAG_WRITE : 0);
83c54070 NP	191	if (unlikely(fault & VM_FAULT_ERROR)) {
	192	if (fault & VM_FAULT_OOM)
	193	goto out_of_memory;
	194	else if (fault & VM_FAULT_SIGBUS)
	195	goto do_sigbus;
	196	BUG();
1da177e4	197	}
83c54070 NP	198	if (fault & VM_FAULT_MAJOR)
	199	tsk->maj_flt++;
	200	else
	201	tsk->min_flt++;
	202
1da177e4 LT	203	/* If we get here, the page fault has been handled. Do the TLB refill
	204	now from the newly-setup PTE, to avoid having to fault again right
	205	away on the same instruction. */
	206	pte = lookup_pte (mm, address);
	207	if (!pte) {
	208	/* From empirical evidence, we can get here, due to
	209	!pte_present(pte). (e.g. if a swap-in occurs, and the page
	210	is swapped back out again before the process that wanted it
	211	gets rescheduled?) */
	212	goto no_pte;
	213	}
	214
	215	__do_tlb_refill(address, textaccess, pte);
	216
	217	no_pte:
	218
	219	up_read(&mm->mmap_sem);
	220	return;
	221
	222	/*
	223	* Something tried to access memory that isn't in our memory map..
	224	* Fix it, but check if it's kernel or user first..
	225	*/
	226	bad_area:
	227	#ifdef DEBUG_FAULT
	228	printk("fault:bad area\n");
	229	#endif
	230	up_read(&mm->mmap_sem);
	231
	232	if (user_mode(regs)) {
	233	static int count=0;
	234	siginfo_t info;
	235	if (count < 4) {
	236	/* This is really to help debug faults when starting
	237	* usermode, so only need a few */
	238	count++;
	239	printk("user mode bad_area address=%08lx pid=%d (%s) pc=%08lx\n",
19c5870c	240	address, task_pid_nr(current), current->comm,
1da177e4 LT	241	(unsigned long) regs->pc);
	242	#if 0
	243	show_regs(regs);
	244	#endif
	245	}
b460cbc5	246	if (is_global_init(tsk)) {
1da177e4 LT	247	panic("INIT had user mode bad_area\n");
	248	}
	249	tsk->thread.address = address;
	250	tsk->thread.error_code = writeaccess;
	251	info.si_signo = SIGSEGV;
	252	info.si_errno = 0;
	253	info.si_addr = (void *) address;
	254	force_sig_info(SIGSEGV, &info, tsk);
	255	return;
	256	}
	257
	258	no_context:
	259	#ifdef DEBUG_FAULT
	260	printk("fault:No context\n");
	261	#endif
	262	/* Are we prepared to handle this kernel fault? */
	263	fixup = search_exception_tables(regs->pc);
	264	if (fixup) {
	265	regs->pc = fixup->fixup;
	266	return;
	267	}
	268
	269	/*
	270	* Oops. The kernel tried to access some bad page. We'll have to
	271	* terminate things with extreme prejudice.
	272	*
	273	*/
	274	if (address < PAGE_SIZE)
	275	printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
	276	else
	277	printk(KERN_ALERT "Unable to handle kernel paging request");
	278	printk(" at virtual address %08lx\n", address);
	279	printk(KERN_ALERT "pc = %08Lx%08Lx\n", regs->pc >> 32, regs->pc & 0xffffffff);
	280	die("Oops", regs, writeaccess);
	281	do_exit(SIGKILL);
	282
	283	/*
	284	* We ran out of memory, or some other thing happened to us that made
	285	* us unable to handle the page fault gracefully.
	286	*/
	287	out_of_memory:
b460cbc5	288	if (is_global_init(current)) {
1da177e4 LT	289	panic("INIT out of memory\n");
	290	yield();
	291	goto survive;
	292	}
	293	printk("fault:Out of memory\n");
	294	up_read(&mm->mmap_sem);
b460cbc5	295	if (is_global_init(current)) {
1da177e4 LT	296	yield();
	297	down_read(&mm->mmap_sem);
	298	goto survive;
	299	}
	300	printk("VM: killing process %s\n", tsk->comm);
	301	if (user_mode(regs))
dcca2bde	302	do_group_exit(SIGKILL);
1da177e4 LT	303	goto no_context;
	304
	305	do_sigbus:
	306	printk("fault:Do sigbus\n");
	307	up_read(&mm->mmap_sem);
	308
	309	/*
	310	* Send a sigbus, regardless of whether we were in kernel
	311	* or user mode.
	312	*/
	313	tsk->thread.address = address;
	314	tsk->thread.error_code = writeaccess;
	315	tsk->thread.trap_no = 14;
	316	force_sig(SIGBUS, tsk);
	317
	318	/* Kernel mode? Handle exceptions or die */
	319	if (!user_mode(regs))
	320	goto no_context;
	321	}
	322
1da177e4 LT	323	void update_mmu_cache(struct vm_area_struct * vma,
	324	unsigned long address, pte_t pte)
	325	{
1da177e4 LT	326	/*
	327	* This appears to get called once for every pte entry that gets
	328	* established => I don't think it's efficient to try refilling the
	329	* TLBs with the pages - some may not get accessed even. Also, for
	330	* executable pages, it is impossible to determine reliably here which
	331	* TLB they should be mapped into (or both even).
	332	*
	333	* So, just do nothing here and handle faults on demand. In the
	334	* TLBMISS handling case, the refill is now done anyway after the pte
	335	* has been fixed up, so that deals with most useful cases.
	336	*/
	337	}
	338
3eeffb32	339	void local_flush_tlb_one(unsigned long asid, unsigned long page)
1da177e4 LT	340	{
	341	unsigned long long match, pteh=0, lpage;
	342	unsigned long tlb;
1da177e4 LT	343
	344	/*
	345	* Sign-extend based on neff.
	346	*/
	347	lpage = (page & NEFF_SIGN) ? (page \| NEFF_MASK) : page;
3eeffb32	348	match = (asid << PTEH_ASID_SHIFT) \| PTEH_VALID;
1da177e4 LT	349	match \|= lpage;
1da177e4 LT	350
3eeffb32 PM	351	for_each_itlb_entry(tlb) {
	352	asm volatile ("getcfg %1, 0, %0"
	353	: "=r" (pteh)
	354	: "r" (tlb) );
1da177e4	355
3eeffb32 PM	356	if (pteh == match) {
	357	__flush_tlb_slot(tlb);
	358	break;
1da177e4 LT	359	}
	360	}
	361
1da177e4 LT	362	for_each_dtlb_entry(tlb) {
	363	asm volatile ("getcfg %1, 0, %0"
	364	: "=r" (pteh)
	365	: "r" (tlb) );
	366
	367	if (pteh == match) {
	368	__flush_tlb_slot(tlb);
	369	break;
	370	}
	371
	372	}
	373	}
	374
3eeffb32	375	void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1da177e4 LT	376	{
	377	unsigned long flags;
	378
1da177e4 LT	379	if (vma->vm_mm) {
	380	page &= PAGE_MASK;
	381	local_irq_save(flags);
3eeffb32	382	local_flush_tlb_one(get_asid(), page);
1da177e4 LT	383	local_irq_restore(flags);
	384	}
	385	}
	386
3eeffb32 PM	387	void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
3eeffb32 PM	388	unsigned long end)
1da177e4 LT	389	{
	390	unsigned long flags;
	391	unsigned long long match, pteh=0, pteh_epn, pteh_low;
	392	unsigned long tlb;
3eeffb32	393	unsigned int cpu = smp_processor_id();
1da177e4 LT	394	struct mm_struct *mm;
	395
	396	mm = vma->vm_mm;
3eeffb32	397	if (cpu_context(cpu, mm) == NO_CONTEXT)
1da177e4 LT	398	return;
	399
	400	local_irq_save(flags);
	401
	402	start &= PAGE_MASK;
	403	end &= PAGE_MASK;
	404
3eeffb32	405	match = (cpu_asid(cpu, mm) << PTEH_ASID_SHIFT) \| PTEH_VALID;
1da177e4 LT	406
	407	/* Flush ITLB */
	408	for_each_itlb_entry(tlb) {
	409	asm volatile ("getcfg %1, 0, %0"
	410	: "=r" (pteh)
	411	: "r" (tlb) );
	412
	413	pteh_epn = pteh & PAGE_MASK;
	414	pteh_low = pteh & ~PAGE_MASK;
	415
	416	if (pteh_low == match && pteh_epn >= start && pteh_epn <= end)
	417	__flush_tlb_slot(tlb);
	418	}
	419
	420	/* Flush DTLB */
	421	for_each_dtlb_entry(tlb) {
	422	asm volatile ("getcfg %1, 0, %0"
	423	: "=r" (pteh)
	424	: "r" (tlb) );
	425
	426	pteh_epn = pteh & PAGE_MASK;
	427	pteh_low = pteh & ~PAGE_MASK;
	428
	429	if (pteh_low == match && pteh_epn >= start && pteh_epn <= end)
	430	__flush_tlb_slot(tlb);
	431	}
	432
	433	local_irq_restore(flags);
	434	}
	435
3eeffb32	436	void local_flush_tlb_mm(struct mm_struct *mm)
1da177e4 LT	437	{
1da177e4 LT	438	unsigned long flags;
3eeffb32	439	unsigned int cpu = smp_processor_id();
1da177e4	440
3eeffb32	441	if (cpu_context(cpu, mm) == NO_CONTEXT)
1da177e4 LT	442	return;
	443
	444	local_irq_save(flags);
	445
3eeffb32 PM	446	cpu_context(cpu, mm) = NO_CONTEXT;
	447	if (mm == current->mm)
	448	activate_context(mm, cpu);
1da177e4 LT	449
1da177e4 LT	450	local_irq_restore(flags);
1da177e4 LT	451	}
1da177e4 LT	452
3eeffb32	453	void local_flush_tlb_all(void)
1da177e4 LT	454	{
1da177e4 LT	455	/* Invalidate all, including shared pages, excluding fixed TLBs */
1da177e4 LT	456	unsigned long flags, tlb;
1da177e4 LT	457
1da177e4 LT	458	local_irq_save(flags);
	459
	460	/* Flush each ITLB entry */
3eeffb32	461	for_each_itlb_entry(tlb)
1da177e4	462	__flush_tlb_slot(tlb);
1da177e4 LT	463
1da177e4 LT	464	/* Flush each DTLB entry */
3eeffb32	465	for_each_dtlb_entry(tlb)
1da177e4	466	__flush_tlb_slot(tlb);
1da177e4 LT	467
	468	local_irq_restore(flags);
	469	}
	470
3eeffb32	471	void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
1da177e4 LT	472	{
	473	/* FIXME: Optimize this later.. */
	474	flush_tlb_all();
	475	}