209 строки
5.5 KiB
C
209 строки
5.5 KiB
C
#ifndef _LINUX_VM86_H
|
|
#define _LINUX_VM86_H
|
|
|
|
/*
|
|
* I'm guessing at the VIF/VIP flag usage, but hope that this is how
|
|
* the Pentium uses them. Linux will return from vm86 mode when both
|
|
* VIF and VIP is set.
|
|
*
|
|
* On a Pentium, we could probably optimize the virtual flags directly
|
|
* in the eflags register instead of doing it "by hand" in vflags...
|
|
*
|
|
* Linus
|
|
*/
|
|
|
|
#define TF_MASK 0x00000100
|
|
#define IF_MASK 0x00000200
|
|
#define IOPL_MASK 0x00003000
|
|
#define NT_MASK 0x00004000
|
|
#define VM_MASK 0x00020000
|
|
#define AC_MASK 0x00040000
|
|
#define VIF_MASK 0x00080000 /* virtual interrupt flag */
|
|
#define VIP_MASK 0x00100000 /* virtual interrupt pending */
|
|
#define ID_MASK 0x00200000
|
|
|
|
#define BIOSSEG 0x0f000
|
|
|
|
#define CPU_086 0
|
|
#define CPU_186 1
|
|
#define CPU_286 2
|
|
#define CPU_386 3
|
|
#define CPU_486 4
|
|
#define CPU_586 5
|
|
|
|
/*
|
|
* Return values for the 'vm86()' system call
|
|
*/
|
|
#define VM86_TYPE(retval) ((retval) & 0xff)
|
|
#define VM86_ARG(retval) ((retval) >> 8)
|
|
|
|
#define VM86_SIGNAL 0 /* return due to signal */
|
|
#define VM86_UNKNOWN 1 /* unhandled GP fault - IO-instruction or similar */
|
|
#define VM86_INTx 2 /* int3/int x instruction (ARG = x) */
|
|
#define VM86_STI 3 /* sti/popf/iret instruction enabled virtual interrupts */
|
|
|
|
/*
|
|
* Additional return values when invoking new vm86()
|
|
*/
|
|
#define VM86_PICRETURN 4 /* return due to pending PIC request */
|
|
#define VM86_TRAP 6 /* return due to DOS-debugger request */
|
|
|
|
/*
|
|
* function codes when invoking new vm86()
|
|
*/
|
|
#define VM86_PLUS_INSTALL_CHECK 0
|
|
#define VM86_ENTER 1
|
|
#define VM86_ENTER_NO_BYPASS 2
|
|
#define VM86_REQUEST_IRQ 3
|
|
#define VM86_FREE_IRQ 4
|
|
#define VM86_GET_IRQ_BITS 5
|
|
#define VM86_GET_AND_RESET_IRQ 6
|
|
|
|
/*
|
|
* This is the stack-layout seen by the user space program when we have
|
|
* done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout
|
|
* is 'kernel_vm86_regs' (see below).
|
|
*/
|
|
|
|
struct vm86_regs {
|
|
/*
|
|
* normal regs, with special meaning for the segment descriptors..
|
|
*/
|
|
long ebx;
|
|
long ecx;
|
|
long edx;
|
|
long esi;
|
|
long edi;
|
|
long ebp;
|
|
long eax;
|
|
long __null_ds;
|
|
long __null_es;
|
|
long __null_fs;
|
|
long __null_gs;
|
|
long orig_eax;
|
|
long eip;
|
|
unsigned short cs, __csh;
|
|
long eflags;
|
|
long esp;
|
|
unsigned short ss, __ssh;
|
|
/*
|
|
* these are specific to v86 mode:
|
|
*/
|
|
unsigned short es, __esh;
|
|
unsigned short ds, __dsh;
|
|
unsigned short fs, __fsh;
|
|
unsigned short gs, __gsh;
|
|
};
|
|
|
|
struct revectored_struct {
|
|
unsigned long __map[8]; /* 256 bits */
|
|
};
|
|
|
|
struct vm86_struct {
|
|
struct vm86_regs regs;
|
|
unsigned long flags;
|
|
unsigned long screen_bitmap;
|
|
unsigned long cpu_type;
|
|
struct revectored_struct int_revectored;
|
|
struct revectored_struct int21_revectored;
|
|
};
|
|
|
|
/*
|
|
* flags masks
|
|
*/
|
|
#define VM86_SCREEN_BITMAP 0x0001
|
|
|
|
struct vm86plus_info_struct {
|
|
unsigned long force_return_for_pic:1;
|
|
unsigned long vm86dbg_active:1; /* for debugger */
|
|
unsigned long vm86dbg_TFpendig:1; /* for debugger */
|
|
unsigned long unused:28;
|
|
unsigned long is_vm86pus:1; /* for vm86 internal use */
|
|
unsigned char vm86dbg_intxxtab[32]; /* for debugger */
|
|
};
|
|
|
|
struct vm86plus_struct {
|
|
struct vm86_regs regs;
|
|
unsigned long flags;
|
|
unsigned long screen_bitmap;
|
|
unsigned long cpu_type;
|
|
struct revectored_struct int_revectored;
|
|
struct revectored_struct int21_revectored;
|
|
struct vm86plus_info_struct vm86plus;
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
/*
|
|
* This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86
|
|
* mode - the main change is that the old segment descriptors aren't
|
|
* useful any more and are forced to be zero by the kernel (and the
|
|
* hardware when a trap occurs), and the real segment descriptors are
|
|
* at the end of the structure. Look at ptrace.h to see the "normal"
|
|
* setup. For user space layout see 'struct vm86_regs' above.
|
|
*/
|
|
|
|
struct kernel_vm86_regs {
|
|
/*
|
|
* normal regs, with special meaning for the segment descriptors..
|
|
*/
|
|
long ebx;
|
|
long ecx;
|
|
long edx;
|
|
long esi;
|
|
long edi;
|
|
long ebp;
|
|
long eax;
|
|
long __null_ds;
|
|
long __null_es;
|
|
long orig_eax;
|
|
long eip;
|
|
unsigned short cs, __csh;
|
|
long eflags;
|
|
long esp;
|
|
unsigned short ss, __ssh;
|
|
/*
|
|
* these are specific to v86 mode:
|
|
*/
|
|
unsigned short es, __esh;
|
|
unsigned short ds, __dsh;
|
|
unsigned short fs, __fsh;
|
|
unsigned short gs, __gsh;
|
|
};
|
|
|
|
struct kernel_vm86_struct {
|
|
struct kernel_vm86_regs regs;
|
|
/*
|
|
* the below part remains on the kernel stack while we are in VM86 mode.
|
|
* 'tss.esp0' then contains the address of VM86_TSS_ESP0 below, and when we
|
|
* get forced back from VM86, the CPU and "SAVE_ALL" will restore the above
|
|
* 'struct kernel_vm86_regs' with the then actual values.
|
|
* Therefore, pt_regs in fact points to a complete 'kernel_vm86_struct'
|
|
* in kernelspace, hence we need not reget the data from userspace.
|
|
*/
|
|
#define VM86_TSS_ESP0 flags
|
|
unsigned long flags;
|
|
unsigned long screen_bitmap;
|
|
unsigned long cpu_type;
|
|
struct revectored_struct int_revectored;
|
|
struct revectored_struct int21_revectored;
|
|
struct vm86plus_info_struct vm86plus;
|
|
struct pt_regs *regs32; /* here we save the pointer to the old regs */
|
|
/*
|
|
* The below is not part of the structure, but the stack layout continues
|
|
* this way. In front of 'return-eip' may be some data, depending on
|
|
* compilation, so we don't rely on this and save the pointer to 'oldregs'
|
|
* in 'regs32' above.
|
|
* However, with GCC-2.7.2 and the current CFLAGS you see exactly this:
|
|
|
|
long return-eip; from call to vm86()
|
|
struct pt_regs oldregs; user space registers as saved by syscall
|
|
*/
|
|
};
|
|
|
|
void handle_vm86_fault(struct kernel_vm86_regs *, long);
|
|
int handle_vm86_trap(struct kernel_vm86_regs *, long, int);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|