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um: take ldt.h to arch/x86/um/asm/mm_context.h

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it's x86-only and we have no business playing with it in asm/mmu.h; make
the latter have
	struct uml_arch_mm_context arch;
instead of
	struct uml_ldt ldt;
and let arch/<subarch>/um/asm/mm_context.h decide what'll be in there.
While we are at it, kill host_ldt.h - it's not needed in part of places
that include it (we want asm/ldt.h in those) and it can be trivially
expanded into the single remaining one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Al Viro 2011-08-18 20:10:49 +01:00 committed by Richard Weinberger
parent f67aa2ffb7
commit b3ee571e58
6 changed files with 58 additions and 61 deletions
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4
arch/um/include/asm/mmu.h
View File

@ -7,11 +7,11 @@
#define __ARCH_UM_MMU_H
#include "mm_id.h"
#include "ldt.h"
#include <asm/mm_context.h>
typedef struct mm_context {
struct mm_id id;
struct uml_ldt ldt;
struct uml_arch_mm_context arch;
struct page **stub_pages;
} mm_context_t;

37
arch/um/include/shared/ldt.h
View File

@ -1,37 +0,0 @@
/*
* Copyright (C) 2004 Fujitsu Siemens Computers GmbH
* Licensed under the GPL
*
* Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
*/
#ifndef __ASM_LDT_H
#define __ASM_LDT_H
#include <linux/mutex.h>
#include <sysdep/host_ldt.h>
extern void ldt_host_info(void);
#define LDT_PAGES_MAX \
((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE)
#define LDT_ENTRIES_PER_PAGE \
(PAGE_SIZE/LDT_ENTRY_SIZE)
#define LDT_DIRECT_ENTRIES \
((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE)
struct ldt_entry {
__u32 a;
__u32 b;
};
typedef struct uml_ldt {
int entry_count;
struct mutex lock;
union {
struct ldt_entry * pages[LDT_PAGES_MAX];
struct ldt_entry entries[LDT_DIRECT_ENTRIES];
} u;
} uml_ldt_t;
#endif

39
arch/x86/um/shared/sysdep/host_ldt.h → arch/x86/um/asm/mm_context.h
View File

@ -1,8 +1,39 @@
#ifndef __ASM_HOST_LDT_H
#define __ASM_HOST_LDT_H
/*
* Copyright (C) 2004 Fujitsu Siemens Computers GmbH
* Licensed under the GPL
*
* Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
*/
#ifndef __ASM_LDT_H
#define __ASM_LDT_H
#include <linux/mutex.h>
#include <asm/ldt.h>
extern void ldt_host_info(void);
#define LDT_PAGES_MAX \
((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE)
#define LDT_ENTRIES_PER_PAGE \
(PAGE_SIZE/LDT_ENTRY_SIZE)
#define LDT_DIRECT_ENTRIES \
((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE)
struct ldt_entry {
__u32 a;
__u32 b;
};
typedef struct uml_ldt {
int entry_count;
struct mutex lock;
union {
struct ldt_entry * pages[LDT_PAGES_MAX];
struct ldt_entry entries[LDT_DIRECT_ENTRIES];
} u;
} uml_ldt_t;
#define LDT_entry_a(info) \
((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
@ -34,4 +65,8 @@
#define LDT_empty(info) (_LDT_empty(info))
#endif
struct uml_arch_mm_context {
uml_ldt_t ldt;
};
#endif

2
arch/x86/um/asm/processor_32.h
View File

@ -7,8 +7,8 @@
#define __UM_PROCESSOR_I386_H
#include <linux/string.h>
#include <sysdep/host_ldt.h>
#include <asm/segment.h>
#include <asm/ldt.h>
extern int host_has_cmov;

36
arch/x86/um/ldt.c
View File

@ -137,7 +137,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
{
int i, err = 0;
unsigned long size;
uml_ldt_t * ldt = &current->mm->context.ldt;
uml_ldt_t *ldt = &current->mm->context.arch.ldt;
if (!ldt->entry_count)
goto out;
@ -205,7 +205,7 @@ static int read_default_ldt(void __user * ptr, unsigned long bytecount)
static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
{
uml_ldt_t * ldt = &current->mm->context.ldt;
uml_ldt_t *ldt = &current->mm->context.arch.ldt;
struct mm_id * mm_idp = &current->mm->context.id;
int i, err;
struct user_desc ldt_info;
@ -397,7 +397,7 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
if (!ptrace_ldt)
mutex_init(&new_mm->ldt.lock);
mutex_init(&new_mm->arch.ldt.lock);
if (!from_mm) {
memset(&desc, 0, sizeof(desc));
@ -429,7 +429,7 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
break;
}
}
new_mm->ldt.entry_count = 0;
new_mm->arch.ldt.entry_count = 0;
goto out;
}
@ -457,26 +457,26 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
* i.e., we have to use the stub for modify_ldt, which
* can't handle the big read buffer of up to 64kB.
*/
mutex_lock(&from_mm->ldt.lock);
if (from_mm->ldt.entry_count <= LDT_DIRECT_ENTRIES)
memcpy(new_mm->ldt.u.entries, from_mm->ldt.u.entries,
sizeof(new_mm->ldt.u.entries));
mutex_lock(&from_mm->arch.ldt.lock);
if (from_mm->arch.ldt.entry_count <= LDT_DIRECT_ENTRIES)
memcpy(new_mm->arch.ldt.u.entries, from_mm->arch.ldt.u.entries,
sizeof(new_mm->arch.ldt.u.entries));
else {
i = from_mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
i = from_mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
while (i-->0) {
page = __get_free_page(GFP_KERNEL|__GFP_ZERO);
if (!page) {
err = -ENOMEM;
break;
}
new_mm->ldt.u.pages[i] =
new_mm->arch.ldt.u.pages[i] =
(struct ldt_entry *) page;
memcpy(new_mm->ldt.u.pages[i],
from_mm->ldt.u.pages[i], PAGE_SIZE);
memcpy(new_mm->arch.ldt.u.pages[i],
from_mm->arch.ldt.u.pages[i], PAGE_SIZE);
}
}
new_mm->ldt.entry_count = from_mm->ldt.entry_count;
mutex_unlock(&from_mm->ldt.lock);
new_mm->arch.ldt.entry_count = from_mm->arch.ldt.entry_count;
mutex_unlock(&from_mm->arch.ldt.lock);
}
out:
@ -488,12 +488,12 @@ void free_ldt(struct mm_context *mm)
{
int i;
if (!ptrace_ldt && mm->ldt.entry_count > LDT_DIRECT_ENTRIES) {
i = mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
if (!ptrace_ldt && mm->arch.ldt.entry_count > LDT_DIRECT_ENTRIES) {
i = mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
while (i-- > 0)
free_page((long) mm->ldt.u.pages[i]);
free_page((long) mm->arch.ldt.u.pages[i]);
}
mm->ldt.entry_count = 0;
mm->arch.ldt.entry_count = 0;
}
int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)

1
arch/x86/um/shared/sysdep/tls.h
View File

@ -24,7 +24,6 @@ typedef struct um_dup_user_desc {
# else /* __KERNEL__ */
# include <ldt.h>
typedef struct user_desc user_desc_t;
# endif /* __KERNEL__ */