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[PATCH] uml: split ldt.h in arch-independent and arch-dependant code 

ldt-{i386,x86_64}.h is made of two different parts - some code for parsing of
LDT descriptors, which is arch-dependant, and the code to handle uml_ldt_t (an
LDT block inside UML), which is mostly arch-independant (among x86 and x86_64,
at least).

Join the common part in a single file (ldt.h) and split the rest away
(host_ldt-{i386,x86_64}.h).

This is needed because processor.h, with next patches, will start including
the LDT descriptor parsing macros in host_ldt.h, but it can't include ldt.h
because it uses semaphores (and to define semaphores one must first include
processor.h!).

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2006-03-31 02:30:19 -08:00 committed by Linus Torvalds
parent 12523bdce1
commit fbdf216155
5 changed files with 78 additions and 107 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/um/Makefile
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@ -20,7 +20,7 @@ core-y += $(ARCH_DIR)/kernel/ \
# Have to precede the include because the included Makefiles reference them.
SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
module.h vm-flags.h elf.h ldt.h
module.h vm-flags.h elf.h host_ldt.h
SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
# XXX: The "os" symlink is only used by arch/um/include/os.h, which includes

34
include/asm-um/host_ldt-i386.h Normal file
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@ -0,0 +1,34 @@
#ifndef __ASM_HOST_LDT_I386_H
#define __ASM_HOST_LDT_I386_H
#include "asm/arch/ldt.h"
/*
* macros stolen from include/asm-i386/desc.h
*/
#define LDT_entry_a(info) \
((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
#define LDT_entry_b(info) \
(((info)->base_addr & 0xff000000) | \
(((info)->base_addr & 0x00ff0000) >> 16) | \
((info)->limit & 0xf0000) | \
(((info)->read_exec_only ^ 1) << 9) | \
((info)->contents << 10) | \
(((info)->seg_not_present ^ 1) << 15) | \
((info)->seg_32bit << 22) | \
((info)->limit_in_pages << 23) | \
((info)->useable << 20) | \
0x7000)
#define LDT_empty(info) (\
(info)->base_addr == 0 && \
(info)->limit == 0 && \
(info)->contents == 0 && \
(info)->read_exec_only == 1 && \
(info)->seg_32bit == 0 && \
(info)->limit_in_pages == 0 && \
(info)->seg_not_present == 1 && \
(info)->useable == 0 )
#endif

39
include/asm-um/ldt-x86_64.h → include/asm-um/host_ldt-x86_64.h
View File

@ -1,43 +1,8 @@
/*
* Copyright (C) 2004 Fujitsu Siemens Computers GmbH
* Licensed under the GPL
*
* Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
*/
#ifndef __ASM_HOST_LDT_X86_64_H
#define __ASM_HOST_LDT_X86_64_H
#ifndef __ASM_LDT_X86_64_H
#define __ASM_LDT_X86_64_H
#include "asm/semaphore.h"
#include "asm/arch/ldt.h"
struct mmu_context_skas;
extern void ldt_host_info(void);
extern long init_new_ldt(struct mmu_context_skas * to_mm,
struct mmu_context_skas * from_mm);
extern void free_ldt(struct mmu_context_skas * mm);
#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 semaphore semaphore;
union {
struct ldt_entry * pages[LDT_PAGES_MAX];
struct ldt_entry entries[LDT_DIRECT_ENTRIES];
} u;
} uml_ldt_t;
/*
* macros stolen from include/asm-x86_64/desc.h
*/

69
include/asm-um/ldt-i386.h
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@ -1,69 +0,0 @@
/*
* Copyright (C) 2004 Fujitsu Siemens Computers GmbH
* Licensed under the GPL
*
* Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
*/
#ifndef __ASM_LDT_I386_H
#define __ASM_LDT_I386_H
#include "asm/semaphore.h"
#include "asm/arch/ldt.h"
struct mmu_context_skas;
extern void ldt_host_info(void);
extern long init_new_ldt(struct mmu_context_skas * to_mm,
struct mmu_context_skas * from_mm);
extern void free_ldt(struct mmu_context_skas * mm);
#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 semaphore semaphore;
union {
struct ldt_entry * pages[LDT_PAGES_MAX];
struct ldt_entry entries[LDT_DIRECT_ENTRIES];
} u;
} uml_ldt_t;
/*
* macros stolen from include/asm-i386/desc.h
*/
#define LDT_entry_a(info) \
((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
#define LDT_entry_b(info) \
(((info)->base_addr & 0xff000000) | \
(((info)->base_addr & 0x00ff0000) >> 16) | \
((info)->limit & 0xf0000) | \
(((info)->read_exec_only ^ 1) << 9) | \
((info)->contents << 10) | \
(((info)->seg_not_present ^ 1) << 15) | \
((info)->seg_32bit << 22) | \
((info)->limit_in_pages << 23) | \
((info)->useable << 20) | \
0x7000)
#define LDT_empty(info) (\
(info)->base_addr == 0 && \
(info)->limit == 0 && \
(info)->contents == 0 && \
(info)->read_exec_only == 1 && \
(info)->seg_32bit == 0 && \
(info)->limit_in_pages == 0 && \
(info)->seg_not_present == 1 && \
(info)->useable == 0 )
#endif

41
include/asm-um/ldt.h Normal file
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@ -0,0 +1,41 @@
/*
* 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 "asm/semaphore.h"
#include "asm/host_ldt.h"
struct mmu_context_skas;
extern void ldt_host_info(void);
extern long init_new_ldt(struct mmu_context_skas * to_mm,
struct mmu_context_skas * from_mm);
extern void free_ldt(struct mmu_context_skas * mm);
#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 semaphore semaphore;
union {
struct ldt_entry * pages[LDT_PAGES_MAX];
struct ldt_entry entries[LDT_DIRECT_ENTRIES];
} u;
} uml_ldt_t;
#endif