[mirror_ubuntu-artful-kernel.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 "asm/pgtable.h"
#include "asm/tlbflush.h"
#include "as-layout.h"
#include "mem_user.h"
#include "os.h"
#include "skas.h"
#include "tlb.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 {
		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);
	}
}

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)
{
	if (!proc_mm && (end_addr > STUB_START))
		end_addr = STUB_START;

	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);
}

void flush_tlb_mm(struct mm_struct *mm)
{
	unsigned long end;

	/*
	 * Don't bother flushing if this address space is about to be
	 * destroyed.
	 */
	if (atomic_read(&mm->mm_users) == 0)
		return;

	end = proc_mm ? task_size : STUB_START;
	fix_range(mm, 0, end, 0);
}

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
	6	#include "linux/mm.h"
7f0536f8	7	#include "asm/pgtable.h"
1da177e4	8	#include "asm/tlbflush.h"
4ff83ce1	9	#include "as-layout.h"
1da177e4 LT	10	#include "mem_user.h"
1da177e4 LT	11	#include "os.h"
77bf4400	12	#include "skas.h"
ba180fd4	13	#include "tlb.h"
1da177e4	14
1466abf2 JD	15	struct host_vm_change {
	16	struct host_vm_op {
	17	enum { NONE, MMAP, MUNMAP, MPROTECT } type;
	18	union {
	19	struct {
	20	unsigned long addr;
	21	unsigned long len;
	22	unsigned int prot;
	23	int fd;
	24	__u64 offset;
	25	} mmap;
	26	struct {
	27	unsigned long addr;
	28	unsigned long len;
	29	} munmap;
	30	struct {
	31	unsigned long addr;
	32	unsigned long len;
	33	unsigned int prot;
	34	} mprotect;
	35	} u;
	36	} ops[1];
	37	int index;
	38	struct mm_id *id;
	39	void *data;
	40	int force;
	41	};
	42
	43	#define INIT_HVC(mm, force) \
	44	((struct host_vm_change) \
	45	{ .ops = { { .type = NONE } }, \
	46	.id = &mm->context.id, \
	47	.data = NULL, \
	48	.index = 0, \
	49	.force = force })
	50
	51	static int do_ops(struct host_vm_change *hvc, int end,
	52	int finished)
	53	{
	54	struct host_vm_op *op;
	55	int i, ret = 0;
	56
	57	for (i = 0; i < end && !ret; i++) {
	58	op = &hvc->ops[i];
	59	switch(op->type) {
	60	case MMAP:
	61	ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
	62	op->u.mmap.prot, op->u.mmap.fd,
	63	op->u.mmap.offset, finished, &hvc->data);
	64	break;
	65	case MUNMAP:
	66	ret = unmap(hvc->id, op->u.munmap.addr,
	67	op->u.munmap.len, finished, &hvc->data);
	68	break;
	69	case MPROTECT:
	70	ret = protect(hvc->id, op->u.mprotect.addr,
	71	op->u.mprotect.len, op->u.mprotect.prot,
	72	finished, &hvc->data);
	73	break;
	74	default:
	75	printk(KERN_ERR "Unknown op type %d in do_ops\n",
	76	op->type);
	77	break;
	78	}
79	}
80
81	return ret;
82	}
83
c5600490	84	static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
1466abf2	85	unsigned int prot, struct host_vm_change *hvc)
c5600490	86	{
5e1f65a6	87	__u64 offset;
c5600490	88	struct host_vm_op *last;
07bf731e	89	int fd, ret = 0;
c5600490 JD	90
c5600490 JD	91	fd = phys_mapping(phys, &offset);
1466abf2 JD	92	if (hvc->index != 0) {
1466abf2 JD	93	last = &hvc->ops[hvc->index - 1];
ba180fd4	94	if ((last->type == MMAP) &&
c5600490	95	(last->u.mmap.addr + last->u.mmap.len == virt) &&
16dd07bc	96	(last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
ba180fd4	97	(last->u.mmap.offset + last->u.mmap.len == offset)) {
c5600490	98	last->u.mmap.len += len;
07bf731e	99	return 0;
c5600490 JD	100	}
	101	}
	102
1466abf2 JD	103	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
	104	ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
	105	hvc->index = 0;
c5600490 JD	106	}
c5600490 JD	107
1466abf2 JD	108	hvc->ops[hvc->index++] = ((struct host_vm_op)
	109	{ .type = MMAP,
	110	.u = { .mmap = { .addr = virt,
	111	.len = len,
	112	.prot = prot,
	113	.fd = fd,
	114	.offset = offset }
07bf731e BS	115	} });
07bf731e BS	116	return ret;
c5600490 JD	117	}
	118
	119	static int add_munmap(unsigned long addr, unsigned long len,
1466abf2	120	struct host_vm_change *hvc)
c5600490 JD	121	{
c5600490 JD	122	struct host_vm_op *last;
07bf731e	123	int ret = 0;
c5600490	124
1466abf2 JD	125	if (hvc->index != 0) {
1466abf2 JD	126	last = &hvc->ops[hvc->index - 1];
ba180fd4 JD	127	if ((last->type == MUNMAP) &&
ba180fd4 JD	128	(last->u.munmap.addr + last->u.mmap.len == addr)) {
c5600490	129	last->u.munmap.len += len;
07bf731e	130	return 0;
c5600490 JD	131	}
	132	}
	133
1466abf2 JD	134	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
	135	ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
	136	hvc->index = 0;
c5600490 JD	137	}
c5600490 JD	138
1466abf2 JD	139	hvc->ops[hvc->index++] = ((struct host_vm_op)
	140	{ .type = MUNMAP,
	141	.u = { .munmap = { .addr = addr,
	142	.len = len } } });
07bf731e	143	return ret;
c5600490 JD	144	}
c5600490 JD	145
16dd07bc	146	static int add_mprotect(unsigned long addr, unsigned long len,
1466abf2	147	unsigned int prot, struct host_vm_change *hvc)
c5600490 JD	148	{
c5600490 JD	149	struct host_vm_op *last;
07bf731e	150	int ret = 0;
c5600490	151
1466abf2 JD	152	if (hvc->index != 0) {
1466abf2 JD	153	last = &hvc->ops[hvc->index - 1];
ba180fd4	154	if ((last->type == MPROTECT) &&
c5600490	155	(last->u.mprotect.addr + last->u.mprotect.len == addr) &&
ba180fd4	156	(last->u.mprotect.prot == prot)) {
c5600490	157	last->u.mprotect.len += len;
07bf731e	158	return 0;
c5600490 JD	159	}
	160	}
	161
1466abf2 JD	162	if (hvc->index == ARRAY_SIZE(hvc->ops)) {
	163	ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
	164	hvc->index = 0;
c5600490 JD	165	}
c5600490 JD	166
1466abf2 JD	167	hvc->ops[hvc->index++] = ((struct host_vm_op)
	168	{ .type = MPROTECT,
	169	.u = { .mprotect = { .addr = addr,
	170	.len = len,
	171	.prot = prot } } });
07bf731e	172	return ret;
c5600490 JD	173	}
c5600490 JD	174
1da177e4 LT	175	#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
1da177e4 LT	176
7f0536f8	177	static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
1466abf2 JD	178	unsigned long end,
1466abf2 JD	179	struct host_vm_change *hvc)
7f0536f8 JD	180	{
7f0536f8 JD	181	pte_t *pte;
16dd07bc	182	int r, w, x, prot, ret = 0;
7f0536f8 JD	183
	184	pte = pte_offset_kernel(pmd, addr);
	185	do {
	186	r = pte_read(*pte);
	187	w = pte_write(*pte);
	188	x = pte_exec(*pte);
	189	if (!pte_young(*pte)) {
	190	r = 0;
	191	w = 0;
	192	} else if (!pte_dirty(*pte)) {
	193	w = 0;
	194	}
16dd07bc JD	195	prot = ((r ? UM_PROT_READ : 0) \| (w ? UM_PROT_WRITE : 0) \|
16dd07bc JD	196	(x ? UM_PROT_EXEC : 0));
1466abf2	197	if (hvc->force \|\| pte_newpage(*pte)) {
ba180fd4	198	if (pte_present(*pte))
7f0536f8	199	ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
1466abf2 JD	200	PAGE_SIZE, prot, hvc);
1466abf2 JD	201	else ret = add_munmap(addr, PAGE_SIZE, hvc);
7f0536f8	202	}
ba180fd4	203	else if (pte_newprot(*pte))
1466abf2	204	ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
7f0536f8 JD	205	pte = pte_mkuptodate(pte);
	206	} while (pte++, addr += PAGE_SIZE, ((addr != end) && !ret));
	207	return ret;
	208	}
	209
	210	static inline int update_pmd_range(pud_t *pud, unsigned long addr,
1466abf2 JD	211	unsigned long end,
1466abf2 JD	212	struct host_vm_change *hvc)
7f0536f8 JD	213	{
	214	pmd_t *pmd;
	215	unsigned long next;
	216	int ret = 0;
	217
	218	pmd = pmd_offset(pud, addr);
	219	do {
	220	next = pmd_addr_end(addr, end);
ba180fd4	221	if (!pmd_present(*pmd)) {
1466abf2 JD	222	if (hvc->force \|\| pmd_newpage(*pmd)) {
1466abf2 JD	223	ret = add_munmap(addr, next - addr, hvc);
7f0536f8 JD	224	pmd_mkuptodate(*pmd);
	225	}
	226	}
1466abf2	227	else ret = update_pte_range(pmd, addr, next, hvc);
7f0536f8 JD	228	} while (pmd++, addr = next, ((addr != end) && !ret));
	229	return ret;
	230	}
	231
	232	static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
1466abf2 JD	233	unsigned long end,
1466abf2 JD	234	struct host_vm_change *hvc)
7f0536f8 JD	235	{
	236	pud_t *pud;
	237	unsigned long next;
	238	int ret = 0;
	239
	240	pud = pud_offset(pgd, addr);
	241	do {
	242	next = pud_addr_end(addr, end);
ba180fd4	243	if (!pud_present(*pud)) {
1466abf2 JD	244	if (hvc->force \|\| pud_newpage(*pud)) {
1466abf2 JD	245	ret = add_munmap(addr, next - addr, hvc);
7f0536f8 JD	246	pud_mkuptodate(*pud);
	247	}
	248	}
1466abf2	249	else ret = update_pmd_range(pud, addr, next, hvc);
7f0536f8 JD	250	} while (pud++, addr = next, ((addr != end) && !ret));
	251	return ret;
	252	}
	253
1da177e4	254	void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
1466abf2	255	unsigned long end_addr, int force)
1da177e4	256	{
7f0536f8	257	pgd_t *pgd;
1466abf2	258	struct host_vm_change hvc;
7f0536f8	259	unsigned long addr = start_addr, next;
1466abf2	260	int ret = 0;
1da177e4	261
1466abf2	262	hvc = INIT_HVC(mm, force);
7f0536f8 JD	263	pgd = pgd_offset(mm, addr);
	264	do {
	265	next = pgd_addr_end(addr, end_addr);
ba180fd4 JD	266	if (!pgd_present(*pgd)) {
ba180fd4 JD	267	if (force \|\| pgd_newpage(*pgd)) {
1466abf2	268	ret = add_munmap(addr, next - addr, &hvc);
7f0536f8	269	pgd_mkuptodate(*pgd);
5e1f65a6	270	}
5e1f65a6	271	}
1466abf2	272	else ret = update_pud_range(pgd, addr, next, &hvc);
7f0536f8	273	} while (pgd++, addr = next, ((addr != end_addr) && !ret));
5e1f65a6	274
ba180fd4	275	if (!ret)
1466abf2	276	ret = do_ops(&hvc, hvc.index, 1);
07bf731e	277
7f0536f8	278	/* This is not an else because ret is modified above */
ba180fd4 JD	279	if (ret) {
	280	printk(KERN_ERR "fix_range_common: failed, killing current "
	281	"process\n");
07bf731e BS	282	force_sig(SIGKILL, current);
07bf731e BS	283	}
1da177e4 LT	284	}
	285
	286	int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
	287	{
5e1f65a6 JD	288	struct mm_struct *mm;
	289	pgd_t *pgd;
	290	pud_t *pud;
	291	pmd_t *pmd;
	292	pte_t *pte;
	293	unsigned long addr, last;
	294	int updated = 0, err;
	295
	296	mm = &init_mm;
ba180fd4	297	for (addr = start; addr < end;) {
5e1f65a6	298	pgd = pgd_offset(mm, addr);
ba180fd4	299	if (!pgd_present(*pgd)) {
5e1f65a6	300	last = ADD_ROUND(addr, PGDIR_SIZE);
ba180fd4	301	if (last > end)
5e1f65a6	302	last = end;
ba180fd4	303	if (pgd_newpage(*pgd)) {
5e1f65a6 JD	304	updated = 1;
	305	err = os_unmap_memory((void *) addr,
	306	last - addr);
ba180fd4	307	if (err < 0)
5e1f65a6 JD	308	panic("munmap failed, errno = %d\n",
	309	-err);
	310	}
	311	addr = last;
	312	continue;
	313	}
	314
	315	pud = pud_offset(pgd, addr);
ba180fd4	316	if (!pud_present(*pud)) {
5e1f65a6	317	last = ADD_ROUND(addr, PUD_SIZE);
ba180fd4	318	if (last > end)
5e1f65a6	319	last = end;
ba180fd4	320	if (pud_newpage(*pud)) {
5e1f65a6 JD	321	updated = 1;
	322	err = os_unmap_memory((void *) addr,
	323	last - addr);
ba180fd4	324	if (err < 0)
5e1f65a6 JD	325	panic("munmap failed, errno = %d\n",
	326	-err);
	327	}
	328	addr = last;
	329	continue;
	330	}
	331
	332	pmd = pmd_offset(pud, addr);
ba180fd4	333	if (!pmd_present(*pmd)) {
5e1f65a6	334	last = ADD_ROUND(addr, PMD_SIZE);
ba180fd4	335	if (last > end)
5e1f65a6	336	last = end;
ba180fd4	337	if (pmd_newpage(*pmd)) {
5e1f65a6 JD	338	updated = 1;
	339	err = os_unmap_memory((void *) addr,
	340	last - addr);
ba180fd4	341	if (err < 0)
5e1f65a6 JD	342	panic("munmap failed, errno = %d\n",
	343	-err);
	344	}
	345	addr = last;
	346	continue;
	347	}
	348
	349	pte = pte_offset_kernel(pmd, addr);
ba180fd4	350	if (!pte_present(pte) \|\| pte_newpage(pte)) {
5e1f65a6 JD	351	updated = 1;
	352	err = os_unmap_memory((void *) addr,
	353	PAGE_SIZE);
ba180fd4	354	if (err < 0)
5e1f65a6 JD	355	panic("munmap failed, errno = %d\n",
5e1f65a6 JD	356	-err);
ba180fd4	357	if (pte_present(*pte))
5e1f65a6 JD	358	map_memory(addr,
	359	pte_val(*pte) & PAGE_MASK,
	360	PAGE_SIZE, 1, 1, 1);
	361	}
ba180fd4	362	else if (pte_newprot(*pte)) {
5e1f65a6 JD	363	updated = 1;
	364	os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
	365	}
	366	addr += PAGE_SIZE;
	367	}
ba180fd4	368	return updated;
1da177e4 LT	369	}
1da177e4 LT	370
77bf4400 JD	371	void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
	372	{
	373	pgd_t *pgd;
	374	pud_t *pud;
	375	pmd_t *pmd;
	376	pte_t *pte;
	377	struct mm_struct *mm = vma->vm_mm;
	378	void *flush = NULL;
	379	int r, w, x, prot, err = 0;
	380	struct mm_id *mm_id;
	381
	382	address &= PAGE_MASK;
	383	pgd = pgd_offset(mm, address);
ba180fd4	384	if (!pgd_present(*pgd))
77bf4400 JD	385	goto kill;
	386
	387	pud = pud_offset(pgd, address);
ba180fd4	388	if (!pud_present(*pud))
77bf4400 JD	389	goto kill;
	390
	391	pmd = pmd_offset(pud, address);
ba180fd4	392	if (!pmd_present(*pmd))
77bf4400 JD	393	goto kill;
	394
	395	pte = pte_offset_kernel(pmd, address);
	396
	397	r = pte_read(*pte);
	398	w = pte_write(*pte);
	399	x = pte_exec(*pte);
	400	if (!pte_young(*pte)) {
	401	r = 0;
	402	w = 0;
	403	} else if (!pte_dirty(*pte)) {
	404	w = 0;
	405	}
	406
6c738ffa	407	mm_id = &mm->context.id;
77bf4400 JD	408	prot = ((r ? UM_PROT_READ : 0) \| (w ? UM_PROT_WRITE : 0) \|
77bf4400 JD	409	(x ? UM_PROT_EXEC : 0));
ba180fd4 JD	410	if (pte_newpage(*pte)) {
ba180fd4 JD	411	if (pte_present(*pte)) {
77bf4400 JD	412	unsigned long long offset;
	413	int fd;
	414
	415	fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
	416	err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
	417	1, &flush);
	418	}
	419	else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
	420	}
ba180fd4	421	else if (pte_newprot(*pte))
77bf4400 JD	422	err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
77bf4400 JD	423
ba180fd4	424	if (err)
77bf4400 JD	425	goto kill;
	426
	427	pte = pte_mkuptodate(pte);
	428
	429	return;
	430
	431	kill:
ba180fd4	432	printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
77bf4400 JD	433	force_sig(SIGKILL, current);
	434	}
	435
1da177e4 LT	436	pgd_t pgd_offset_proc(struct mm_struct mm, unsigned long address)
1da177e4 LT	437	{
ba180fd4	438	return pgd_offset(mm, address);
1da177e4 LT	439	}
	440
	441	pud_t pud_offset_proc(pgd_t pgd, unsigned long address)
	442	{
ba180fd4	443	return pud_offset(pgd, address);
1da177e4 LT	444	}
	445
	446	pmd_t pmd_offset_proc(pud_t pud, unsigned long address)
	447	{
ba180fd4	448	return pmd_offset(pud, address);
1da177e4 LT	449	}
	450
	451	pte_t pte_offset_proc(pmd_t pmd, unsigned long address)
	452	{
ba180fd4	453	return pte_offset_kernel(pmd, address);
1da177e4 LT	454	}
	455
	456	pte_t addr_pte(struct task_struct task, unsigned long addr)
	457	{
5e1f65a6 JD	458	pgd_t *pgd = pgd_offset(task->mm, addr);
	459	pud_t *pud = pud_offset(pgd, addr);
	460	pmd_t *pmd = pmd_offset(pud, addr);
1da177e4	461
ba180fd4	462	return pte_offset_map(pmd, addr);
1da177e4 LT	463	}
1da177e4 LT	464
d67b569f JD	465	void flush_tlb_all(void)
d67b569f JD	466	{
5e1f65a6	467	flush_tlb_mm(current->mm);
d67b569f JD	468	}
	469
	470	void flush_tlb_kernel_range(unsigned long start, unsigned long end)
	471	{
6aa802ce	472	flush_tlb_kernel_range_common(start, end);
d67b569f JD	473	}
	474
	475	void flush_tlb_kernel_vm(void)
	476	{
6aa802ce	477	flush_tlb_kernel_range_common(start_vm, end_vm);
d67b569f JD	478	}
	479
	480	void __flush_tlb_one(unsigned long addr)
	481	{
ba180fd4	482	flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
77bf4400 JD	483	}
77bf4400 JD	484
77bf4400 JD	485	static void fix_range(struct mm_struct *mm, unsigned long start_addr,
	486	unsigned long end_addr, int force)
	487	{
54ae36f2 JD	488	if (!proc_mm && (end_addr > STUB_START))
54ae36f2 JD	489	end_addr = STUB_START;
77bf4400	490
1466abf2	491	fix_range_common(mm, start_addr, end_addr, force);
d67b569f JD	492	}
	493
	494	void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
	495	unsigned long end)
	496	{
ba180fd4 JD	497	if (vma->vm_mm == NULL)
	498	flush_tlb_kernel_range_common(start, end);
	499	else fix_range(vma->vm_mm, start, end, 0);
d67b569f JD	500	}
	501
	502	void flush_tlb_mm(struct mm_struct *mm)
	503	{
77bf4400 JD	504	unsigned long end;
77bf4400 JD	505
ba180fd4 JD	506	/*
	507	* Don't bother flushing if this address space is about to be
	508	* destroyed.
	509	*/
	510	if (atomic_read(&mm->mm_users) == 0)
	511	return;
77bf4400	512
54ae36f2	513	end = proc_mm ? task_size : STUB_START;
ba180fd4	514	fix_range(mm, 0, end, 0);
d67b569f JD	515	}
	516
	517	void force_flush_all(void)
	518	{
77bf4400 JD	519	struct mm_struct *mm = current->mm;
	520	struct vm_area_struct *vma = mm->mmap;
	521
ba180fd4	522	while (vma != NULL) {
77bf4400 JD	523	fix_range(mm, vma->vm_start, vma->vm_end, 1);
	524	vma = vma->vm_next;
	525	}
d67b569f	526	}