diff options
Diffstat (limited to 'xenolinux-2.4.21-pre4-sparse/arch/xeno/kernel/ioport.c')
-rw-r--r-- | xenolinux-2.4.21-pre4-sparse/arch/xeno/kernel/ioport.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/xenolinux-2.4.21-pre4-sparse/arch/xeno/kernel/ioport.c b/xenolinux-2.4.21-pre4-sparse/arch/xeno/kernel/ioport.c index 798c5c5c1f..c43daee3fd 100644 --- a/xenolinux-2.4.21-pre4-sparse/arch/xeno/kernel/ioport.c +++ b/xenolinux-2.4.21-pre4-sparse/arch/xeno/kernel/ioport.c @@ -7,13 +7,30 @@ asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int turn_on) { - /* No IO permission! */ - return -EPERM; + /* No IO permission! Selective IO perms aren't virtualised yet. */ + return -EPERM; } asmlinkage int sys_iopl(unsigned long unused) { - /* The hypervisor won't allow it! */ - return -EPERM; + struct pt_regs *regs = (struct pt_regs *)&unused; + unsigned int level = regs->ebx; + unsigned int old = (regs->eflags >> 12) & 3; + + if ( !(start_info.flags & SIF_PRIVILEGED) ) + return -EPERM; + + if ( level > 3 ) + return -EINVAL; + if ( (level > old) && !capable(CAP_SYS_RAWIO) ) + return -EPERM; + + /* Change the one on our stack for sanity's sake. */ + regs->eflags = (regs->eflags & 0xffffcfff) | (level << 12); + + /* Force the change at ring 0. */ + HYPERVISOR_iopl(level); + + return 0; } |