214 lines
5.5 KiB
C
214 lines
5.5 KiB
C
#ifndef _LINUX_VM86_H
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#define _LINUX_VM86_H
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/*
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* I'm guessing at the VIF/VIP flag usage, but hope that this is how
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* the Pentium uses them. Linux will return from vm86 mode when both
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* VIF and VIP is set.
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*
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* On a Pentium, we could probably optimize the virtual flags directly
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* in the eflags register instead of doing it "by hand" in vflags...
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*
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* Linus
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*/
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#include <asm/processor-flags.h>
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#ifdef CONFIG_VM86
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#define X86_VM_MASK X86_EFLAGS_VM
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#else
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#define X86_VM_MASK 0 /* No VM86 support */
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#endif
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#define BIOSSEG 0x0f000
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#define CPU_086 0
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#define CPU_186 1
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#define CPU_286 2
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#define CPU_386 3
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#define CPU_486 4
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#define CPU_586 5
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/*
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* Return values for the 'vm86()' system call
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*/
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#define VM86_TYPE(retval) ((retval) & 0xff)
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#define VM86_ARG(retval) ((retval) >> 8)
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#define VM86_SIGNAL 0 /* return due to signal */
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#define VM86_UNKNOWN 1 /* unhandled GP fault
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- IO-instruction or similar */
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#define VM86_INTx 2 /* int3/int x instruction (ARG = x) */
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#define VM86_STI 3 /* sti/popf/iret instruction enabled
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virtual interrupts */
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/*
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* Additional return values when invoking new vm86()
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*/
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#define VM86_PICRETURN 4 /* return due to pending PIC request */
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#define VM86_TRAP 6 /* return due to DOS-debugger request */
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/*
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* function codes when invoking new vm86()
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*/
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#define VM86_PLUS_INSTALL_CHECK 0
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#define VM86_ENTER 1
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#define VM86_ENTER_NO_BYPASS 2
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#define VM86_REQUEST_IRQ 3
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#define VM86_FREE_IRQ 4
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#define VM86_GET_IRQ_BITS 5
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#define VM86_GET_AND_RESET_IRQ 6
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/*
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* This is the stack-layout seen by the user space program when we have
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* done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout
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* is 'kernel_vm86_regs' (see below).
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*/
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struct vm86_regs {
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/*
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* normal regs, with special meaning for the segment descriptors..
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*/
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long ebx;
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long ecx;
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long edx;
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long esi;
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long edi;
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long ebp;
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long eax;
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long __null_ds;
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long __null_es;
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long __null_fs;
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long __null_gs;
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long orig_eax;
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long eip;
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unsigned short cs, __csh;
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long eflags;
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long esp;
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unsigned short ss, __ssh;
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/*
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* these are specific to v86 mode:
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*/
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unsigned short es, __esh;
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unsigned short ds, __dsh;
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unsigned short fs, __fsh;
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unsigned short gs, __gsh;
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};
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struct revectored_struct {
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unsigned long __map[8]; /* 256 bits */
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};
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struct vm86_struct {
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struct vm86_regs regs;
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unsigned long flags;
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unsigned long screen_bitmap;
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unsigned long cpu_type;
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struct revectored_struct int_revectored;
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struct revectored_struct int21_revectored;
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};
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/*
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* flags masks
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*/
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#define VM86_SCREEN_BITMAP 0x0001
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struct vm86plus_info_struct {
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unsigned long force_return_for_pic:1;
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unsigned long vm86dbg_active:1; /* for debugger */
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unsigned long vm86dbg_TFpendig:1; /* for debugger */
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unsigned long unused:28;
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unsigned long is_vm86pus:1; /* for vm86 internal use */
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unsigned char vm86dbg_intxxtab[32]; /* for debugger */
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};
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struct vm86plus_struct {
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struct vm86_regs regs;
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unsigned long flags;
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unsigned long screen_bitmap;
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unsigned long cpu_type;
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struct revectored_struct int_revectored;
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struct revectored_struct int21_revectored;
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struct vm86plus_info_struct vm86plus;
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};
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#ifdef __KERNEL__
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/*
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* This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86
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* mode - the main change is that the old segment descriptors aren't
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* useful any more and are forced to be zero by the kernel (and the
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* hardware when a trap occurs), and the real segment descriptors are
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* at the end of the structure. Look at ptrace.h to see the "normal"
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* setup. For user space layout see 'struct vm86_regs' above.
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*/
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#include <asm/ptrace.h>
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struct kernel_vm86_regs {
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/*
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* normal regs, with special meaning for the segment descriptors..
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*/
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struct pt_regs pt;
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/*
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* these are specific to v86 mode:
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*/
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unsigned short es, __esh;
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unsigned short ds, __dsh;
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unsigned short fs, __fsh;
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unsigned short gs, __gsh;
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};
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struct kernel_vm86_struct {
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struct kernel_vm86_regs regs;
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/*
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* the below part remains on the kernel stack while we are in VM86 mode.
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* 'tss.esp0' then contains the address of VM86_TSS_ESP0 below, and when we
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* get forced back from VM86, the CPU and "SAVE_ALL" will restore the above
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* 'struct kernel_vm86_regs' with the then actual values.
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* Therefore, pt_regs in fact points to a complete 'kernel_vm86_struct'
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* in kernelspace, hence we need not reget the data from userspace.
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*/
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#define VM86_TSS_ESP0 flags
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unsigned long flags;
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unsigned long screen_bitmap;
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unsigned long cpu_type;
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struct revectored_struct int_revectored;
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struct revectored_struct int21_revectored;
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struct vm86plus_info_struct vm86plus;
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struct pt_regs *regs32; /* here we save the pointer to the old regs */
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/*
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* The below is not part of the structure, but the stack layout continues
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* this way. In front of 'return-eip' may be some data, depending on
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* compilation, so we don't rely on this and save the pointer to 'oldregs'
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* in 'regs32' above.
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* However, with GCC-2.7.2 and the current CFLAGS you see exactly this:
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long return-eip; from call to vm86()
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struct pt_regs oldregs; user space registers as saved by syscall
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*/
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};
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#ifdef CONFIG_VM86
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void handle_vm86_fault(struct kernel_vm86_regs *, long);
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int handle_vm86_trap(struct kernel_vm86_regs *, long, int);
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struct pt_regs *save_v86_state(struct kernel_vm86_regs *);
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struct task_struct;
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void release_vm86_irqs(struct task_struct *);
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#else
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#define handle_vm86_fault(a, b)
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#define release_vm86_irqs(a)
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static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c)
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{
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return 0;
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}
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#endif /* CONFIG_VM86 */
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#endif /* __KERNEL__ */
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#endif
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