[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / um / kernel / tlb.c

/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/mm.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include "as-layout.h"
#include "mem_user.h"
#include "os.h"
#include "skas.h"

struct host_vm_change {
	struct host_vm_op {
		enum { NONE, MMAP, MUNMAP, MPROTECT } type;
		union {
			struct {
				unsigned long addr;
				unsigned long len;
				unsigned int prot;
				int fd;
				__u64 offset;
			} mmap;
			struct {
				unsigned long addr;
				unsigned long len;
			} munmap;
			struct {
				unsigned long addr;
				unsigned long len;
				unsigned int prot;
			} mprotect;
		} u;
	} ops[1];
	int index;
	struct mm_id *id;
	void *data;
	int force;
};

#define INIT_HVC(mm, force) \
	((struct host_vm_change) \
	 { .ops		= { { .type = NONE } },	\
	   .id		= &mm->context.id, \
       	   .data	= NULL, \
	   .index	= 0, \
	   .force	= force })

static int do_ops(struct host_vm_change *hvc, int end,
		  int finished)
{
	struct host_vm_op *op;
	int i, ret = 0;

	for (i = 0; i < end && !ret; i++) {
		op = &hvc->ops[i];
		switch (op->type) {
		case MMAP:
			ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
				  op->u.mmap.prot, op->u.mmap.fd,
				  op->u.mmap.offset, finished, &hvc->data);
			break;
		case MUNMAP:
			ret = unmap(hvc->id, op->u.munmap.addr,
				    op->u.munmap.len, finished, &hvc->data);
			break;
		case MPROTECT:
			ret = protect(hvc->id, op->u.mprotect.addr,
				      op->u.mprotect.len, op->u.mprotect.prot,
				      finished, &hvc->data);
			break;
		default:
			printk(KERN_ERR "Unknown op type %d in do_ops\n",
			       op->type);
			break;
		}
	}

	return ret;
}

static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
		    unsigned int prot, struct host_vm_change *hvc)
{
	__u64 offset;
	struct host_vm_op *last;
	int fd, ret = 0;

	fd = phys_mapping(phys, &offset);
	if (hvc->index != 0) {
		last = &hvc->ops[hvc->index - 1];
		if ((last->type == MMAP) &&
		   (last->u.mmap.addr + last->u.mmap.len == virt) &&
		   (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
		   (last->u.mmap.offset + last->u.mmap.len == offset)) {
			last->u.mmap.len += len;
			return 0;
		}
	}

	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
		ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
		hvc->index = 0;
	}

	hvc->ops[hvc->index++] = ((struct host_vm_op)
				  { .type	= MMAP,
				    .u = { .mmap = { .addr	= virt,
						     .len	= len,
						     .prot	= prot,
						     .fd	= fd,
						     .offset	= offset }
			   } });
	return ret;
}

static int add_munmap(unsigned long addr, unsigned long len,
		      struct host_vm_change *hvc)
{
	struct host_vm_op *last;
	int ret = 0;

	if (hvc->index != 0) {
		last = &hvc->ops[hvc->index - 1];
		if ((last->type == MUNMAP) &&
		   (last->u.munmap.addr + last->u.mmap.len == addr)) {
			last->u.munmap.len += len;
			return 0;
		}
	}

	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
		ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
		hvc->index = 0;
	}

	hvc->ops[hvc->index++] = ((struct host_vm_op)
				  { .type	= MUNMAP,
			     	    .u = { .munmap = { .addr	= addr,
						       .len	= len } } });
	return ret;
}

static int add_mprotect(unsigned long addr, unsigned long len,
			unsigned int prot, struct host_vm_change *hvc)
{
	struct host_vm_op *last;
	int ret = 0;

	if (hvc->index != 0) {
		last = &hvc->ops[hvc->index - 1];
		if ((last->type == MPROTECT) &&
		   (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
		   (last->u.mprotect.prot == prot)) {
			last->u.mprotect.len += len;
			return 0;
		}
	}

	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
		ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
		hvc->index = 0;
	}

	hvc->ops[hvc->index++] = ((struct host_vm_op)
				  { .type	= MPROTECT,
			     	    .u = { .mprotect = { .addr	= addr,
							 .len	= len,
							 .prot	= prot } } });
	return ret;
}

#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))

static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
				   unsigned long end,
				   struct host_vm_change *hvc)
{
	pte_t *pte;
	int r, w, x, prot, ret = 0;

	pte = pte_offset_kernel(pmd, addr);
	do {
		if ((addr >= STUB_START) && (addr < STUB_END))
			continue;

		r = pte_read(*pte);
		w = pte_write(*pte);
		x = pte_exec(*pte);
		if (!pte_young(*pte)) {
			r = 0;
			w = 0;
		} else if (!pte_dirty(*pte))
			w = 0;

		prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
			(x ? UM_PROT_EXEC : 0));
		if (hvc->force || pte_newpage(*pte)) {
			if (pte_present(*pte))
				ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
					       PAGE_SIZE, prot, hvc);
			else
				ret = add_munmap(addr, PAGE_SIZE, hvc);
		} else if (pte_newprot(*pte))
			ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
		*pte = pte_mkuptodate(*pte);
	} while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
	return ret;
}

static inline int update_pmd_range(pud_t *pud, unsigned long addr,
				   unsigned long end,
				   struct host_vm_change *hvc)
{
	pmd_t *pmd;
	unsigned long next;
	int ret = 0;

	pmd = pmd_offset(pud, addr);
	do {
		next = pmd_addr_end(addr, end);
		if (!pmd_present(*pmd)) {
			if (hvc->force || pmd_newpage(*pmd)) {
				ret = add_munmap(addr, next - addr, hvc);
				pmd_mkuptodate(*pmd);
			}
		}
		else ret = update_pte_range(pmd, addr, next, hvc);
	} while (pmd++, addr = next, ((addr < end) && !ret));
	return ret;
}

static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
				   unsigned long end,
				   struct host_vm_change *hvc)
{
	pud_t *pud;
	unsigned long next;
	int ret = 0;

	pud = pud_offset(pgd, addr);
	do {
		next = pud_addr_end(addr, end);
		if (!pud_present(*pud)) {
			if (hvc->force || pud_newpage(*pud)) {
				ret = add_munmap(addr, next - addr, hvc);
				pud_mkuptodate(*pud);
			}
		}
		else ret = update_pmd_range(pud, addr, next, hvc);
	} while (pud++, addr = next, ((addr < end) && !ret));
	return ret;
}

void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
		      unsigned long end_addr, int force)
{
	pgd_t *pgd;
	struct host_vm_change hvc;
	unsigned long addr = start_addr, next;
	int ret = 0;

	hvc = INIT_HVC(mm, force);
	pgd = pgd_offset(mm, addr);
	do {
		next = pgd_addr_end(addr, end_addr);
		if (!pgd_present(*pgd)) {
			if (force || pgd_newpage(*pgd)) {
				ret = add_munmap(addr, next - addr, &hvc);
				pgd_mkuptodate(*pgd);
			}
		}
		else ret = update_pud_range(pgd, addr, next, &hvc);
	} while (pgd++, addr = next, ((addr < end_addr) && !ret));

	if (!ret)
		ret = do_ops(&hvc, hvc.index, 1);

	/* This is not an else because ret is modified above */
	if (ret) {
		printk(KERN_ERR "fix_range_common: failed, killing current "
		       "process\n");
		force_sig(SIGKILL, current);
	}
}

static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
{
	struct mm_struct *mm;
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	unsigned long addr, last;
	int updated = 0, err;

	mm = &init_mm;
	for (addr = start; addr < end;) {
		pgd = pgd_offset(mm, addr);
		if (!pgd_present(*pgd)) {
			last = ADD_ROUND(addr, PGDIR_SIZE);
			if (last > end)
				last = end;
			if (pgd_newpage(*pgd)) {
				updated = 1;
				err = os_unmap_memory((void *) addr,
						      last - addr);
				if (err < 0)
					panic("munmap failed, errno = %d\n",
					      -err);
			}
			addr = last;
			continue;
		}

		pud = pud_offset(pgd, addr);
		if (!pud_present(*pud)) {
			last = ADD_ROUND(addr, PUD_SIZE);
			if (last > end)
				last = end;
			if (pud_newpage(*pud)) {
				updated = 1;
				err = os_unmap_memory((void *) addr,
						      last - addr);
				if (err < 0)
					panic("munmap failed, errno = %d\n",
					      -err);
			}
			addr = last;
			continue;
		}

		pmd = pmd_offset(pud, addr);
		if (!pmd_present(*pmd)) {
			last = ADD_ROUND(addr, PMD_SIZE);
			if (last > end)
				last = end;
			if (pmd_newpage(*pmd)) {
				updated = 1;
				err = os_unmap_memory((void *) addr,
						      last - addr);
				if (err < 0)
					panic("munmap failed, errno = %d\n",
					      -err);
			}
			addr = last;
			continue;
		}

		pte = pte_offset_kernel(pmd, addr);
		if (!pte_present(*pte) || pte_newpage(*pte)) {
			updated = 1;
			err = os_unmap_memory((void *) addr,
					      PAGE_SIZE);
			if (err < 0)
				panic("munmap failed, errno = %d\n",
				      -err);
			if (pte_present(*pte))
				map_memory(addr,
					   pte_val(*pte) & PAGE_MASK,
					   PAGE_SIZE, 1, 1, 1);
		}
		else if (pte_newprot(*pte)) {
			updated = 1;
			os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
		}
		addr += PAGE_SIZE;
	}
	return updated;
}

void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	struct mm_struct *mm = vma->vm_mm;
	void *flush = NULL;
	int r, w, x, prot, err = 0;
	struct mm_id *mm_id;

	address &= PAGE_MASK;
	pgd = pgd_offset(mm, address);
	if (!pgd_present(*pgd))
		goto kill;

	pud = pud_offset(pgd, address);
	if (!pud_present(*pud))
		goto kill;

	pmd = pmd_offset(pud, address);
	if (!pmd_present(*pmd))
		goto kill;

	pte = pte_offset_kernel(pmd, address);

	r = pte_read(*pte);
	w = pte_write(*pte);
	x = pte_exec(*pte);
	if (!pte_young(*pte)) {
		r = 0;
		w = 0;
	} else if (!pte_dirty(*pte)) {
		w = 0;
	}

	mm_id = &mm->context.id;
	prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
		(x ? UM_PROT_EXEC : 0));
	if (pte_newpage(*pte)) {
		if (pte_present(*pte)) {
			unsigned long long offset;
			int fd;

			fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
			err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
				  1, &flush);
		}
		else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
	}
	else if (pte_newprot(*pte))
		err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);

	if (err)
		goto kill;

	*pte = pte_mkuptodate(*pte);

	return;

kill:
	printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
	force_sig(SIGKILL, current);
}

pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
{
	return pgd_offset(mm, address);
}

pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
{
	return pud_offset(pgd, address);
}

pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
{
	return pmd_offset(pud, address);
}

pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
{
	return pte_offset_kernel(pmd, address);
}

pte_t *addr_pte(struct task_struct *task, unsigned long addr)
{
	pgd_t *pgd = pgd_offset(task->mm, addr);
	pud_t *pud = pud_offset(pgd, addr);
	pmd_t *pmd = pmd_offset(pud, addr);

	return pte_offset_map(pmd, addr);
}

void flush_tlb_all(void)
{
	flush_tlb_mm(current->mm);
}

void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
	flush_tlb_kernel_range_common(start, end);
}

void flush_tlb_kernel_vm(void)
{
	flush_tlb_kernel_range_common(start_vm, end_vm);
}

void __flush_tlb_one(unsigned long addr)
{
	flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
}

static void fix_range(struct mm_struct *mm, unsigned long start_addr,
		      unsigned long end_addr, int force)
{
	fix_range_common(mm, start_addr, end_addr, force);
}

void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
		     unsigned long end)
{
	if (vma->vm_mm == NULL)
		flush_tlb_kernel_range_common(start, end);
	else fix_range(vma->vm_mm, start, end, 0);
}
EXPORT_SYMBOL(flush_tlb_range);

void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
			unsigned long end)
{
	/*
	 * Don't bother flushing if this address space is about to be
	 * destroyed.
	 */
	if (atomic_read(&mm->mm_users) == 0)
		return;

	fix_range(mm, start, end, 0);
}

void flush_tlb_mm(struct mm_struct *mm)
{
	struct vm_area_struct *vma = mm->mmap;

	while (vma != NULL) {
		fix_range(mm, vma->vm_start, vma->vm_end, 0);
		vma = vma->vm_next;
	}
}

void force_flush_all(void)
{
	struct mm_struct *mm = current->mm;
	struct vm_area_struct *vma = mm->mmap;

	while (vma != NULL) {
		fix_range(mm, vma->vm_start, vma->vm_end, 1);
		vma = vma->vm_next;
	}
}
Commit	Line	Data
5e1f65a6	1	/*
ba180fd4	2	* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
1da177e4 LT	3	* Licensed under the GPL
	4	*/
	5
8192ab42	6	#include <linux/mm.h>
73395a00	7	#include <linux/module.h>
8192ab42 JD	8	#include <linux/sched.h>
	9	#include <asm/pgtable.h>
	10	#include <asm/tlbflush.h>
4ff83ce1	11	#include "as-layout.h"
1da177e4 LT	12	#include "mem_user.h"
1da177e4 LT	13	#include "os.h"
77bf4400	14	#include "skas.h"
1da177e4	15
1466abf2 JD	16	struct host_vm_change {
	17	struct host_vm_op {
	18	enum { NONE, MMAP, MUNMAP, MPROTECT } type;
	19	union {
	20	struct {
	21	unsigned long addr;
	22	unsigned long len;
	23	unsigned int prot;
	24	int fd;
	25	__u64 offset;
	26	} mmap;
	27	struct {
	28	unsigned long addr;
	29	unsigned long len;
	30	} munmap;
	31	struct {
	32	unsigned long addr;
	33	unsigned long len;
	34	unsigned int prot;
	35	} mprotect;
	36	} u;
	37	} ops[1];
	38	int index;
	39	struct mm_id *id;
	40	void *data;
	41	int force;
	42	};
	43
	44	#define INIT_HVC(mm, force) \
	45	((struct host_vm_change) \
	46	{ .ops = { { .type = NONE } }, \
	47	.id = &mm->context.id, \
	48	.data = NULL, \
	49	.index = 0, \
	50	.force = force })
	51
	52	static int do_ops(struct host_vm_change *hvc, int end,
	53	int finished)
	54	{
	55	struct host_vm_op *op;
	56	int i, ret = 0;
	57
	58	for (i = 0; i < end && !ret; i++) {
	59	op = &hvc->ops[i];
c5d4bb17	60	switch (op->type) {
1466abf2 JD	61	case MMAP:
	62	ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
	63	op->u.mmap.prot, op->u.mmap.fd,
	64	op->u.mmap.offset, finished, &hvc->data);
	65	break;
	66	case MUNMAP:
	67	ret = unmap(hvc->id, op->u.munmap.addr,
	68	op->u.munmap.len, finished, &hvc->data);
	69	break;
	70	case MPROTECT:
	71	ret = protect(hvc->id, op->u.mprotect.addr,
	72	op->u.mprotect.len, op->u.mprotect.prot,
	73	finished, &hvc->data);
	74	break;
	75	default:
	76	printk(KERN_ERR "Unknown op type %d in do_ops\n",
	77	op->type);
	78	break;
	79	}
	80	}
	81
	82	return ret;
	83	}
	84
c5600490	85	static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
1466abf2	86	unsigned int prot, struct host_vm_change *hvc)
c5600490	87	{
5e1f65a6	88	__u64 offset;
c5600490	89	struct host_vm_op *last;
07bf731e	90	int fd, ret = 0;
c5600490 JD	91
c5600490 JD	92	fd = phys_mapping(phys, &offset);
1466abf2 JD	93	if (hvc->index != 0) {
1466abf2 JD	94	last = &hvc->ops[hvc->index - 1];
ba180fd4	95	if ((last->type == MMAP) &&
c5600490	96	(last->u.mmap.addr + last->u.mmap.len == virt) &&
16dd07bc	97	(last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
ba180fd4	98	(last->u.mmap.offset + last->u.mmap.len == offset)) {
c5600490	99	last->u.mmap.len += len;
07bf731e	100	return 0;
c5600490 JD	101	}
	102	}
	103
1466abf2 JD	104	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
	105	ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
	106	hvc->index = 0;
c5600490 JD	107	}
c5600490 JD	108
1466abf2 JD	109	hvc->ops[hvc->index++] = ((struct host_vm_op)
	110	{ .type = MMAP,
	111	.u = { .mmap = { .addr = virt,
	112	.len = len,
	113	.prot = prot,
	114	.fd = fd,
	115	.offset = offset }
07bf731e BS	116	} });
07bf731e BS	117	return ret;
c5600490 JD	118	}
	119
	120	static int add_munmap(unsigned long addr, unsigned long len,
1466abf2	121	struct host_vm_change *hvc)
c5600490 JD	122	{
c5600490 JD	123	struct host_vm_op *last;
07bf731e	124	int ret = 0;
c5600490	125
1466abf2 JD	126	if (hvc->index != 0) {
1466abf2 JD	127	last = &hvc->ops[hvc->index - 1];
ba180fd4 JD	128	if ((last->type == MUNMAP) &&
ba180fd4 JD	129	(last->u.munmap.addr + last->u.mmap.len == addr)) {
c5600490	130	last->u.munmap.len += len;
07bf731e	131	return 0;
c5600490 JD	132	}
	133	}
	134
1466abf2 JD	135	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
	136	ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
	137	hvc->index = 0;
c5600490 JD	138	}
c5600490 JD	139
1466abf2 JD	140	hvc->ops[hvc->index++] = ((struct host_vm_op)
	141	{ .type = MUNMAP,
	142	.u = { .munmap = { .addr = addr,
	143	.len = len } } });
07bf731e	144	return ret;
c5600490 JD	145	}
c5600490 JD	146
16dd07bc	147	static int add_mprotect(unsigned long addr, unsigned long len,
1466abf2	148	unsigned int prot, struct host_vm_change *hvc)
c5600490 JD	149	{
c5600490 JD	150	struct host_vm_op *last;
07bf731e	151	int ret = 0;
c5600490	152
1466abf2 JD	153	if (hvc->index != 0) {
1466abf2 JD	154	last = &hvc->ops[hvc->index - 1];
ba180fd4	155	if ((last->type == MPROTECT) &&
c5600490	156	(last->u.mprotect.addr + last->u.mprotect.len == addr) &&
ba180fd4	157	(last->u.mprotect.prot == prot)) {
c5600490	158	last->u.mprotect.len += len;
07bf731e	159	return 0;
c5600490 JD	160	}
	161	}
	162
1466abf2 JD	163	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
	164	ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
	165	hvc->index = 0;
c5600490 JD	166	}
c5600490 JD	167
1466abf2 JD	168	hvc->ops[hvc->index++] = ((struct host_vm_op)
	169	{ .type = MPROTECT,
	170	.u = { .mprotect = { .addr = addr,
	171	.len = len,
	172	.prot = prot } } });
07bf731e	173	return ret;
c5600490 JD	174	}
c5600490 JD	175
1da177e4 LT	176	#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
1da177e4 LT	177
7f0536f8	178	static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
1466abf2 JD	179	unsigned long end,
1466abf2 JD	180	struct host_vm_change *hvc)
7f0536f8 JD	181	{
7f0536f8 JD	182	pte_t *pte;
16dd07bc	183	int r, w, x, prot, ret = 0;
7f0536f8 JD	184
	185	pte = pte_offset_kernel(pmd, addr);
	186	do {
3963333f JD	187	if ((addr >= STUB_START) && (addr < STUB_END))
	188	continue;
	189
7f0536f8 JD	190	r = pte_read(*pte);
	191	w = pte_write(*pte);
	192	x = pte_exec(*pte);
	193	if (!pte_young(*pte)) {
	194	r = 0;
	195	w = 0;
0b4e273f	196	} else if (!pte_dirty(*pte))
7f0536f8	197	w = 0;
0b4e273f	198
16dd07bc JD	199	prot = ((r ? UM_PROT_READ : 0) \| (w ? UM_PROT_WRITE : 0) \|
16dd07bc JD	200	(x ? UM_PROT_EXEC : 0));
1466abf2	201	if (hvc->force \|\| pte_newpage(*pte)) {
ba180fd4	202	if (pte_present(*pte))
7f0536f8	203	ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
1466abf2	204	PAGE_SIZE, prot, hvc);
0b4e273f JD	205	else
	206	ret = add_munmap(addr, PAGE_SIZE, hvc);
	207	} else if (pte_newprot(*pte))
1466abf2	208	ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
7f0536f8	209	pte = pte_mkuptodate(pte);
909e90d3	210	} while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
7f0536f8 JD	211	return ret;
	212	}
	213
	214	static inline int update_pmd_range(pud_t *pud, unsigned long addr,
1466abf2 JD	215	unsigned long end,
1466abf2 JD	216	struct host_vm_change *hvc)
7f0536f8 JD	217	{
	218	pmd_t *pmd;
	219	unsigned long next;
	220	int ret = 0;
	221
	222	pmd = pmd_offset(pud, addr);
	223	do {
	224	next = pmd_addr_end(addr, end);
ba180fd4	225	if (!pmd_present(*pmd)) {
1466abf2 JD	226	if (hvc->force \|\| pmd_newpage(*pmd)) {
1466abf2 JD	227	ret = add_munmap(addr, next - addr, hvc);
7f0536f8 JD	228	pmd_mkuptodate(*pmd);
	229	}
	230	}
1466abf2	231	else ret = update_pte_range(pmd, addr, next, hvc);
909e90d3	232	} while (pmd++, addr = next, ((addr < end) && !ret));
7f0536f8 JD	233	return ret;
	234	}
	235
	236	static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
1466abf2 JD	237	unsigned long end,
1466abf2 JD	238	struct host_vm_change *hvc)
7f0536f8 JD	239	{
	240	pud_t *pud;
	241	unsigned long next;
	242	int ret = 0;
	243
	244	pud = pud_offset(pgd, addr);
	245	do {
	246	next = pud_addr_end(addr, end);
ba180fd4	247	if (!pud_present(*pud)) {
1466abf2 JD	248	if (hvc->force \|\| pud_newpage(*pud)) {
1466abf2 JD	249	ret = add_munmap(addr, next - addr, hvc);
7f0536f8 JD	250	pud_mkuptodate(*pud);
	251	}
	252	}
1466abf2	253	else ret = update_pmd_range(pud, addr, next, hvc);
909e90d3	254	} while (pud++, addr = next, ((addr < end) && !ret));
7f0536f8 JD	255	return ret;
	256	}
	257
1da177e4	258	void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
1466abf2	259	unsigned long end_addr, int force)
1da177e4	260	{
7f0536f8	261	pgd_t *pgd;
1466abf2	262	struct host_vm_change hvc;
7f0536f8	263	unsigned long addr = start_addr, next;
1466abf2	264	int ret = 0;
1da177e4	265
1466abf2	266	hvc = INIT_HVC(mm, force);
7f0536f8 JD	267	pgd = pgd_offset(mm, addr);
	268	do {
	269	next = pgd_addr_end(addr, end_addr);
ba180fd4 JD	270	if (!pgd_present(*pgd)) {
ba180fd4 JD	271	if (force \|\| pgd_newpage(*pgd)) {
1466abf2	272	ret = add_munmap(addr, next - addr, &hvc);
7f0536f8	273	pgd_mkuptodate(*pgd);
5e1f65a6	274	}
5e1f65a6	275	}
1466abf2	276	else ret = update_pud_range(pgd, addr, next, &hvc);
909e90d3	277	} while (pgd++, addr = next, ((addr < end_addr) && !ret));
5e1f65a6	278
ba180fd4	279	if (!ret)
1466abf2	280	ret = do_ops(&hvc, hvc.index, 1);
07bf731e	281
7f0536f8	282	/* This is not an else because ret is modified above */
ba180fd4 JD	283	if (ret) {
	284	printk(KERN_ERR "fix_range_common: failed, killing current "
	285	"process\n");
07bf731e BS	286	force_sig(SIGKILL, current);
07bf731e BS	287	}
1da177e4 LT	288	}
1da177e4 LT	289
c75d053b	290	static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
1da177e4	291	{
5e1f65a6 JD	292	struct mm_struct *mm;
	293	pgd_t *pgd;
	294	pud_t *pud;
	295	pmd_t *pmd;
	296	pte_t *pte;
	297	unsigned long addr, last;
	298	int updated = 0, err;
	299
	300	mm = &init_mm;
ba180fd4	301	for (addr = start; addr < end;) {
5e1f65a6	302	pgd = pgd_offset(mm, addr);
ba180fd4	303	if (!pgd_present(*pgd)) {
5e1f65a6	304	last = ADD_ROUND(addr, PGDIR_SIZE);
ba180fd4	305	if (last > end)
5e1f65a6	306	last = end;
ba180fd4	307	if (pgd_newpage(*pgd)) {
5e1f65a6 JD	308	updated = 1;
	309	err = os_unmap_memory((void *) addr,
	310	last - addr);
ba180fd4	311	if (err < 0)
5e1f65a6 JD	312	panic("munmap failed, errno = %d\n",
	313	-err);
	314	}
	315	addr = last;
	316	continue;
	317	}
	318
	319	pud = pud_offset(pgd, addr);
ba180fd4	320	if (!pud_present(*pud)) {
5e1f65a6	321	last = ADD_ROUND(addr, PUD_SIZE);
ba180fd4	322	if (last > end)
5e1f65a6	323	last = end;
ba180fd4	324	if (pud_newpage(*pud)) {
5e1f65a6 JD	325	updated = 1;
	326	err = os_unmap_memory((void *) addr,
	327	last - addr);
ba180fd4	328	if (err < 0)
5e1f65a6 JD	329	panic("munmap failed, errno = %d\n",
	330	-err);
	331	}
	332	addr = last;
	333	continue;
	334	}
	335
	336	pmd = pmd_offset(pud, addr);
ba180fd4	337	if (!pmd_present(*pmd)) {
5e1f65a6	338	last = ADD_ROUND(addr, PMD_SIZE);
ba180fd4	339	if (last > end)
5e1f65a6	340	last = end;
ba180fd4	341	if (pmd_newpage(*pmd)) {
5e1f65a6 JD	342	updated = 1;
	343	err = os_unmap_memory((void *) addr,
	344	last - addr);
ba180fd4	345	if (err < 0)
5e1f65a6 JD	346	panic("munmap failed, errno = %d\n",
	347	-err);
	348	}
	349	addr = last;
	350	continue;
	351	}
	352
	353	pte = pte_offset_kernel(pmd, addr);
ba180fd4	354	if (!pte_present(pte) \|\| pte_newpage(pte)) {
5e1f65a6 JD	355	updated = 1;
	356	err = os_unmap_memory((void *) addr,
	357	PAGE_SIZE);
ba180fd4	358	if (err < 0)
5e1f65a6 JD	359	panic("munmap failed, errno = %d\n",
5e1f65a6 JD	360	-err);
ba180fd4	361	if (pte_present(*pte))
5e1f65a6 JD	362	map_memory(addr,
	363	pte_val(*pte) & PAGE_MASK,
	364	PAGE_SIZE, 1, 1, 1);
	365	}
ba180fd4	366	else if (pte_newprot(*pte)) {
5e1f65a6 JD	367	updated = 1;
	368	os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
	369	}
	370	addr += PAGE_SIZE;
	371	}
ba180fd4	372	return updated;
1da177e4 LT	373	}
1da177e4 LT	374
77bf4400 JD	375	void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
	376	{
	377	pgd_t *pgd;
	378	pud_t *pud;
	379	pmd_t *pmd;
	380	pte_t *pte;
	381	struct mm_struct *mm = vma->vm_mm;
	382	void *flush = NULL;
	383	int r, w, x, prot, err = 0;
	384	struct mm_id *mm_id;
	385
	386	address &= PAGE_MASK;
	387	pgd = pgd_offset(mm, address);
ba180fd4	388	if (!pgd_present(*pgd))
77bf4400 JD	389	goto kill;
	390
	391	pud = pud_offset(pgd, address);
ba180fd4	392	if (!pud_present(*pud))
77bf4400 JD	393	goto kill;
	394
	395	pmd = pmd_offset(pud, address);
ba180fd4	396	if (!pmd_present(*pmd))
77bf4400 JD	397	goto kill;
	398
	399	pte = pte_offset_kernel(pmd, address);
	400
	401	r = pte_read(*pte);
	402	w = pte_write(*pte);
	403	x = pte_exec(*pte);
	404	if (!pte_young(*pte)) {
	405	r = 0;
	406	w = 0;
	407	} else if (!pte_dirty(*pte)) {
	408	w = 0;
	409	}
	410
6c738ffa	411	mm_id = &mm->context.id;
77bf4400 JD	412	prot = ((r ? UM_PROT_READ : 0) \| (w ? UM_PROT_WRITE : 0) \|
77bf4400 JD	413	(x ? UM_PROT_EXEC : 0));
ba180fd4 JD	414	if (pte_newpage(*pte)) {
ba180fd4 JD	415	if (pte_present(*pte)) {
77bf4400 JD	416	unsigned long long offset;
	417	int fd;
	418
	419	fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
	420	err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
	421	1, &flush);
	422	}
	423	else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
	424	}
ba180fd4	425	else if (pte_newprot(*pte))
77bf4400 JD	426	err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
77bf4400 JD	427
ba180fd4	428	if (err)
77bf4400 JD	429	goto kill;
	430
	431	pte = pte_mkuptodate(pte);
	432
	433	return;
	434
	435	kill:
ba180fd4	436	printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
77bf4400 JD	437	force_sig(SIGKILL, current);
	438	}
	439
1da177e4 LT	440	pgd_t pgd_offset_proc(struct mm_struct mm, unsigned long address)
1da177e4 LT	441	{
ba180fd4	442	return pgd_offset(mm, address);
1da177e4 LT	443	}
	444
	445	pud_t pud_offset_proc(pgd_t pgd, unsigned long address)
	446	{
ba180fd4	447	return pud_offset(pgd, address);
1da177e4 LT	448	}
	449
	450	pmd_t pmd_offset_proc(pud_t pud, unsigned long address)
	451	{
ba180fd4	452	return pmd_offset(pud, address);
1da177e4 LT	453	}
	454
	455	pte_t pte_offset_proc(pmd_t pmd, unsigned long address)
	456	{
ba180fd4	457	return pte_offset_kernel(pmd, address);
1da177e4 LT	458	}
	459
	460	pte_t addr_pte(struct task_struct task, unsigned long addr)
	461	{
5e1f65a6 JD	462	pgd_t *pgd = pgd_offset(task->mm, addr);
	463	pud_t *pud = pud_offset(pgd, addr);
	464	pmd_t *pmd = pmd_offset(pud, addr);
1da177e4	465
ba180fd4	466	return pte_offset_map(pmd, addr);
1da177e4 LT	467	}
1da177e4 LT	468
d67b569f JD	469	void flush_tlb_all(void)
d67b569f JD	470	{
5e1f65a6	471	flush_tlb_mm(current->mm);
d67b569f JD	472	}
	473
	474	void flush_tlb_kernel_range(unsigned long start, unsigned long end)
	475	{
6aa802ce	476	flush_tlb_kernel_range_common(start, end);
d67b569f JD	477	}
	478
	479	void flush_tlb_kernel_vm(void)
	480	{
6aa802ce	481	flush_tlb_kernel_range_common(start_vm, end_vm);
d67b569f JD	482	}
	483
	484	void __flush_tlb_one(unsigned long addr)
	485	{
ba180fd4	486	flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
77bf4400 JD	487	}
77bf4400 JD	488
77bf4400 JD	489	static void fix_range(struct mm_struct *mm, unsigned long start_addr,
	490	unsigned long end_addr, int force)
	491	{
1466abf2	492	fix_range_common(mm, start_addr, end_addr, force);
d67b569f JD	493	}
	494
	495	void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
	496	unsigned long end)
	497	{
ba180fd4 JD	498	if (vma->vm_mm == NULL)
	499	flush_tlb_kernel_range_common(start, end);
	500	else fix_range(vma->vm_mm, start, end, 0);
d67b569f	501	}
73395a00	502	EXPORT_SYMBOL(flush_tlb_range);
d67b569f	503
0b4e273f JD	504	void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
0b4e273f JD	505	unsigned long end)
d67b569f	506	{
ba180fd4 JD	507	/*
	508	* Don't bother flushing if this address space is about to be
	509	* destroyed.
	510	*/
	511	if (atomic_read(&mm->mm_users) == 0)
	512	return;
77bf4400	513
0b4e273f JD	514	fix_range(mm, start, end, 0);
	515	}
	516
	517	void flush_tlb_mm(struct mm_struct *mm)
	518	{
	519	struct vm_area_struct *vma = mm->mmap;
	520
	521	while (vma != NULL) {
	522	fix_range(mm, vma->vm_start, vma->vm_end, 0);
	523	vma = vma->vm_next;
	524	}
d67b569f JD	525	}
	526
	527	void force_flush_all(void)
	528	{
77bf4400 JD	529	struct mm_struct *mm = current->mm;
	530	struct vm_area_struct *vma = mm->mmap;
	531
ba180fd4	532	while (vma != NULL) {
77bf4400 JD	533	fix_range(mm, vma->vm_start, vma->vm_end, 1);
	534	vma = vma->vm_next;
	535	}
d67b569f	536	}