patch-2.1.15 linux/include/asm-i386/vm86.h

• Lines: 142
• Date: Wed Dec 11 16:41:23 1996
• Orig file: v2.1.14/linux/include/asm-i386/vm86.h
• Orig date: Sat Oct 19 10:07:32 1996

diff -u --recursive --new-file v2.1.14/linux/include/asm-i386/vm86.h linux/include/asm-i386/vm86.h
@@ -43,12 +43,26 @@
 #define VM86_STI	3	/* sti/popf/iret instruction enabled virtual interrupts */
 
 /*
- * This is the 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.
+ * 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 programm 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 {
@@ -64,6 +78,8 @@
 	long eax;
 	long __null_ds;
 	long __null_es;
+	long __null_fs;
+	long __null_gs;
 	long orig_eax;
 	long eip;
 	unsigned short cs, __csh;
@@ -97,11 +113,96 @@
  */
 #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 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 vm86_regs *, long);
-void handle_vm86_debug(struct vm86_regs *, long);
+void handle_vm86_fault(struct kernel_vm86_regs *, long);
+int handle_vm86_trap(struct kernel_vm86_regs *, long, int);
 
-#endif
+#endif /* __KERNEL__ */
 
 #endif