http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/asm-i386/vm86.h

#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 #ifdef CONFIG_VM86 #define VM_MASK 0x00020000 #else #define VM_MASK 0 /* ignored */ #endif #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 */ }; #ifdef CONFIG_VM86 void handle_vm86_fault(struct kernel_vm86_regs *, long); int handle_vm86_trap(struct kernel_vm86_regs *, long, int); struct task_struct; void release_vm86_irqs(struct task_struct *); #else #define handle_vm86_fault(a, b) #define release_vm86_irqs(a) static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c) { return 0; } #endif /* CONFIG_VM86 */ #endif /* __KERNEL__ */ #endif