I386_VM86(2) BSD/i386 System Calls Manual I386_VM86(2)NAME
i386_vm86 -- set virtual 8086 processor registers and mode
i386 Architecture Library (libi386, -li386)
i386_vm86(struct vm86_struct *vmcp);
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.
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.
i386_vm86() will fail if:
[EFAULT] The state at vmcp was not readable to the user process.
i386 Microprocessor Programmer's Reference Manual, Intel
BSD February 20, 1996 BSD
Check Out this Related Man Page
VM86(2) Linux Programmer's Manual VM86(2)NAME
vm86old, vm86 - enter virtual 8086 mode
int vm86old(struct vm86_struct *info);
int vm86(unsigned long fn, struct vm86plus_struct *v86);
The system call vm86() was introduced in Linux 0.97p2. In Linux 2.1.15 and 2.0.28 it was renamed to vm86old(), and a new vm86() was intro-
duced. The definition of struct vm86_struct was changed in 1.1.8 and 1.1.9.
These calls cause the process to enter VM86 mode (virtual-8086 in Intel literature), and are used by dosemu.
VM86 mode is an emulation of real mode within a protected mode task.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
EFAULT This return value is specific to i386 and indicates a problem with getting user-space data.
ENOSYS This return value indicates the call is not implemented on the present architecture.
EPERM Saved kernel stack exists. (This is a kernel sanity check; the saved stack should exist only within vm86 mode itself.)
This call is specific to Linux on 32-bit Intel processors, and should not be used in programs intended to be portable.
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2009-02-20 VM86(2)
pls let me know ..
1)How to fine which UNIX machine
Ex . whether it is 32 bit processor OR 64 bit processor ..
2) HP-ux is machine or Architectural ?
pls replay as soon as possible ..
Thanks.. (3 Replies)
the log contains mathematical operation as follows
fm_void_mathematics : PCM_OP_MATHS input function
PIN_FLD_NUM1 INT 1
PIN_FLD_NUM2 INT 2
PIN_FLD_OUT INT *
D Wed Sep 16 05:40:22 2009 solaris_testing
PIN_FLD_SUM int 3
D Wed Sep 16 05:40:22 2009... (1 Reply)