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authorBrian Gerst <brgerst@gmail.com>2009-12-09 19:01:52 -0500
committerH. Peter Anvin <hpa@zytor.com>2009-12-09 16:28:10 -0800
commit27f59559d63375a4d59e7c720a439d9f0b47edad (patch)
tree7990a73f63b67ea6123f9be4767aad82911877c4
parente258e4e0b495e6ecbd073d6bef1eafb62a58919a (diff)
x86: Merge sys_iopl
Change 32-bit sys_iopl to PTREGSCALL1, and merge with 64-bit. Signed-off-by: Brian Gerst <brgerst@gmail.com> LKML-Reference: <1260403316-5679-3-git-send-email-brgerst@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
-rw-r--r--arch/x86/include/asm/syscalls.h6
-rw-r--r--arch/x86/kernel/entry_32.S2
-rw-r--r--arch/x86/kernel/ioport.c28
3 files changed, 7 insertions, 29 deletions
diff --git a/arch/x86/include/asm/syscalls.h b/arch/x86/include/asm/syscalls.h
index 372b76edd63f..4b694cd904c4 100644
--- a/arch/x86/include/asm/syscalls.h
+++ b/arch/x86/include/asm/syscalls.h
@@ -18,6 +18,7 @@
/* Common in X86_32 and X86_64 */
/* kernel/ioport.c */
asmlinkage long sys_ioperm(unsigned long, unsigned long, int);
+long sys_iopl(unsigned int, struct pt_regs *);
/* kernel/process.c */
int sys_fork(struct pt_regs *);
@@ -35,8 +36,6 @@ asmlinkage int sys_get_thread_area(struct user_desc __user *);
/* X86_32 only */
#ifdef CONFIG_X86_32
-/* kernel/ioport.c */
-long sys_iopl(struct pt_regs *);
/* kernel/process_32.c */
int sys_clone(struct pt_regs *);
@@ -70,9 +69,6 @@ int sys_vm86(struct pt_regs *);
#else /* CONFIG_X86_32 */
/* X86_64 only */
-/* kernel/ioport.c */
-asmlinkage long sys_iopl(unsigned int, struct pt_regs *);
-
/* kernel/process_64.c */
asmlinkage long sys_clone(unsigned long, unsigned long,
void __user *, void __user *,
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 34dbfa909dd7..ab7fcef37453 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -758,7 +758,7 @@ ptregs_##name: \
addl $4,%esp; \
ret
-PTREGSCALL0(iopl)
+PTREGSCALL1(iopl)
PTREGSCALL0(fork)
PTREGSCALL0(clone)
PTREGSCALL0(vfork)
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 99c4d308f16b..85ecc7c57ba6 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -103,9 +103,10 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
* on system-call entry - see also fork() and the signal handling
* code.
*/
-static int do_iopl(unsigned int level, struct pt_regs *regs)
+long sys_iopl(unsigned int level, struct pt_regs *regs)
{
unsigned int old = (regs->flags >> 12) & 3;
+ struct thread_struct *t = &current->thread;
if (level > 3)
return -EINVAL;
@@ -115,29 +116,10 @@ static int do_iopl(unsigned int level, struct pt_regs *regs)
return -EPERM;
}
regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12);
-
- return 0;
-}
-
#ifdef CONFIG_X86_32
-long sys_iopl(struct pt_regs *regs)
-{
- unsigned int level = regs->bx;
- struct thread_struct *t = &current->thread;
- int rc;
-
- rc = do_iopl(level, regs);
- if (rc < 0)
- goto out;
-
t->iopl = level << 12;
set_iopl_mask(t->iopl);
-out:
- return rc;
-}
-#else
-asmlinkage long sys_iopl(unsigned int level, struct pt_regs *regs)
-{
- return do_iopl(level, regs);
-}
#endif
+
+ return 0;
+}