mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
af170c5061
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
#ifndef _ASM_X86_VM86_H
|
|
#define _ASM_X86_VM86_H
|
|
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <uapi/asm/vm86.h>
|
|
|
|
/*
|
|
* 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..
|
|
*/
|
|
struct pt_regs pt;
|
|
/*
|
|
* 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 pt_regs *save_v86_state(struct kernel_vm86_regs *);
|
|
|
|
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 /* _ASM_X86_VM86_H */
|