diff options
| author | Chris Wright <chrisw@sous-sol.org> | 2008-01-30 15:33:10 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 15:33:10 +0300 |
| commit | a1bf250a6f31afb8caac166ae50dc7b89c38084c (patch) | |
| tree | 71d2525cd3b8583655e9e733d8c9033214fd9657 /arch/x86/kernel/ioport.c | |
| parent | 9718769d298f8642d5ef41eb5f55669d7c5b9fd6 (diff) | |
| download | linux-a1bf250a6f31afb8caac166ae50dc7b89c38084c.tar.xz | |
x86: refactor ioport unification
Refactor ioport unification to pull out common code.
Cc: mboton@gmail.com
Cc: Kevin Winchester <kjwinchester@gmail.com>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/ioport.c')
| -rw-r--r-- | arch/x86/kernel/ioport.c | 40 |
1 files changed, 21 insertions, 19 deletions
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c index be72d809bce7..50e5e4a31c85 100644 --- a/arch/x86/kernel/ioport.c +++ b/arch/x86/kernel/ioport.c @@ -113,13 +113,9 @@ 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. */ -#ifdef CONFIG_X86_32 -asmlinkage long sys_iopl(unsigned long regsp) +static int do_iopl(unsigned int level, struct pt_regs *regs) { - struct pt_regs *regs = (struct pt_regs *)®sp; - unsigned int level = regs->bx; unsigned int old = (regs->flags >> 12) & 3; - struct thread_struct *t = ¤t->thread; if (level > 3) return -EINVAL; @@ -128,25 +124,31 @@ asmlinkage long sys_iopl(unsigned long regsp) if (!capable(CAP_SYS_RAWIO)) return -EPERM; } - t->iopl = level << 12; regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12); - set_iopl_mask(t->iopl); + return 0; } -#else -asmlinkage long sys_iopl(unsigned int level, struct pt_regs *regs) + +#ifdef CONFIG_X86_32 +asmlinkage long sys_iopl(unsigned long regsp) { - unsigned int old = (regs->flags >> 12) & 3; + struct pt_regs *regs = (struct pt_regs *)®sp; + unsigned int level = regs->bx; + struct thread_struct *t = ¤t->thread; + int rc; - if (level > 3) - return -EINVAL; - /* Trying to gain more privileges? */ - if (level > old) { - if (!capable(CAP_SYS_RAWIO)) - return -EPERM; - } - regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12); + rc = do_iopl(level, regs); + if (rc < 0) + goto out; - return 0; + 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 |