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i386_iopl(2) [netbsd man page]

I386_IOPL(2)						   BSD/i386 System Calls Manual 					      I386_IOPL(2)

i386_iopl -- change the i386 I/O privilege level LIBRARY
i386 Architecture Library (libi386, -li386) SYNOPSIS
#include <sys/types.h> #include <machine/sysarch.h> int i386_iopl(int iopl); DESCRIPTION
i386_iopl() sets the i386 I/O privilege level to the value specified by iopl. This call is restricted to the super-user. RETURN VALUES
Upon successful completion, i386_iopl() returns 0. Otherwise, a value of -1 is returned and the global variable errno is set to indicate the error. ERRORS
i386_iopl() will fail if: [EPERM] The caller was not the super-user, or the operation was not permitted at the current security level. REFERENCES
i386 Microprocessor Programmer's Reference Manual, Intel WARNING
You can really hose your machine if you enable user-level I/O and write to hardware ports without care. BSD
April 12, 2004 BSD

Check Out this Related Man Page

I386_VM86(2)						   BSD/i386 System Calls Manual 					      I386_VM86(2)

i386_vm86 -- set virtual 8086 processor registers and mode LIBRARY
i386 Architecture Library (libi386, -li386) SYNOPSIS
#include <sys/types.h> #include <signal.h> #include <machine/mcontext.h> #include <machine/segments.h> #include <machine/sysarch.h> #include <machine/vm86.h> int i386_vm86(struct vm86_struct *vmcp); DESCRIPTION
i386_vm86() will set the process into virtual 8086 mode using the registers and selectors specified by the context pointed to by vmcp. The processor registers are set from vmcp->substr.regs, and the emulated processor type from vmcp->substr.ss_cpu_type. The kernel keeps a pointer to the context, and uses the tables stored at vmcp->int_byuser and vmcp->int21_byuser for fast virtual interrupt handling. If the n th bit is clear in the first of these arrays, then the kernel may directly emulate the real-mode x86 INT n instruction handling. If the n th bit is set, then the process is delivered a signal when an INT instruction is executed. Since MS-DOS puts many DOS functions onto interrupt 21, it is handled specially: the k th bit in the vmcp->int21_byuser array is checked when INT 21 is requested and the ah register is k. RETURN VALUES
This routine does not normally return: 32-bit mode will be restored by the delivery of a signal to the process. In case of an error in set- ting the VM86 mode, a value of -1 is returned and the global variable errno is set to indicate the error. ERRORS
i386_vm86() will fail if: [EFAULT] The state at vmcp was not readable to the user process. REFERENCES
i386 Microprocessor Programmer's Reference Manual, Intel BSD
February 20, 1996 BSD
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