mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 04:38:03 +00:00
5ca28d24ae
I ran into a case in new code where free_vm86(task) was the only consumer of the 'task' variable: arch/x86/kernel/process.c: In function ‘exit_thread’: arch/x86/kernel/process.c:118:31: error: unused variable ‘t’ [-Werror=unused-variable] Robustify the definition in the !CONFIG_VM86 case. Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/ZgaFfyHMOdLHEKm+@gmail.com
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#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 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 cpu_type;
|
|
struct revectored_struct int_revectored;
|
|
struct revectored_struct int21_revectored;
|
|
struct vm86plus_info_struct vm86plus;
|
|
};
|
|
|
|
#ifdef CONFIG_VM86
|
|
|
|
void handle_vm86_fault(struct kernel_vm86_regs *, long);
|
|
int handle_vm86_trap(struct kernel_vm86_regs *, long, int);
|
|
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
|
|
|
|
#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;
|
|
}
|
|
|
|
static inline void save_v86_state(struct kernel_vm86_regs *a, int b) { }
|
|
|
|
#define free_vm86(task) do { (void)(task); } while(0)
|
|
|
|
#endif /* CONFIG_VM86 */
|
|
|
|
#endif /* _ASM_X86_VM86_H */
|