These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / x86 / include / asm / vm86.h

diff --git a/kernel/arch/x86/include/asm/vm86.h b/kernel/arch/x86/include/asm/vm86.h
index 1d8de3f..1e491f3 100644 (file)
--- a/kernel/arch/x86/include/asm/vm86.h
+++ b/kernel/arch/x86/include/asm/vm86.h
@@ -1,7 +1,6 @@
 #ifndef _ASM_X86_VM86_H
 #define _ASM_X86_VM86_H
 
-
 #include <asm/ptrace.h>
 #include <uapi/asm/vm86.h>
 
@@ -28,43 +27,49 @@ struct kernel_vm86_regs {
        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
+struct vm86 {
+       struct vm86plus_struct __user *user_vm86;
+       struct pt_regs regs32;
+       unsigned long veflags;
+       unsigned long veflags_mask;
+       unsigned long saved_sp0;
+
        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 pt_regs *save_v86_state(struct kernel_vm86_regs *);
+void save_v86_state(struct kernel_vm86_regs *, int);
 
 struct task_struct;
+
+#define free_vm86(t) do {                              \
+       struct thread_struct *__t = (t);                \
+       if (__t->vm86 != NULL) {                        \
+               kfree(__t->vm86);                       \
+               __t->vm86 = NULL;                       \
+       }                                               \
+} while (0)
+
+/*
+ * Support for VM86 programs to request interrupts for
+ * real mode hardware drivers:
+ */
+#define FIRST_VM86_IRQ          3
+#define LAST_VM86_IRQ          15
+
+static inline int invalid_vm86_irq(int irq)
+{
+       return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ;
+}
+
 void release_vm86_irqs(struct task_struct *);
 
 #else
@@ -77,6 +82,10 @@ static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c)
        return 0;
 }
 
+static inline void save_v86_state(struct kernel_vm86_regs *a, int b) { }
+
+#define free_vm86(t) do { } while(0)
+
 #endif /* CONFIG_VM86 */
 
 #endif /* _ASM_X86_VM86_H */