cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vm86.h (2182B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_X86_VM86_H
      3#define _ASM_X86_VM86_H
      4
      5#include <asm/ptrace.h>
      6#include <uapi/asm/vm86.h>
      7
      8/*
      9 * This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86
     10 * mode - the main change is that the old segment descriptors aren't
     11 * useful any more and are forced to be zero by the kernel (and the
     12 * hardware when a trap occurs), and the real segment descriptors are
     13 * at the end of the structure. Look at ptrace.h to see the "normal"
     14 * setup. For user space layout see 'struct vm86_regs' above.
     15 */
     16
     17struct kernel_vm86_regs {
     18/*
     19 * normal regs, with special meaning for the segment descriptors..
     20 */
     21	struct pt_regs pt;
     22/*
     23 * these are specific to v86 mode:
     24 */
     25	unsigned short es, __esh;
     26	unsigned short ds, __dsh;
     27	unsigned short fs, __fsh;
     28	unsigned short gs, __gsh;
     29};
     30
     31struct vm86 {
     32	struct vm86plus_struct __user *user_vm86;
     33	struct pt_regs regs32;
     34	unsigned long veflags;
     35	unsigned long veflags_mask;
     36	unsigned long saved_sp0;
     37
     38	unsigned long flags;
     39	unsigned long cpu_type;
     40	struct revectored_struct int_revectored;
     41	struct revectored_struct int21_revectored;
     42	struct vm86plus_info_struct vm86plus;
     43};
     44
     45#ifdef CONFIG_VM86
     46
     47void handle_vm86_fault(struct kernel_vm86_regs *, long);
     48int handle_vm86_trap(struct kernel_vm86_regs *, long, int);
     49void save_v86_state(struct kernel_vm86_regs *, int);
     50
     51struct task_struct;
     52
     53#define free_vm86(t) do {				\
     54	struct thread_struct *__t = (t);		\
     55	if (__t->vm86 != NULL) {			\
     56		kfree(__t->vm86);			\
     57		__t->vm86 = NULL;			\
     58	}						\
     59} while (0)
     60
     61/*
     62 * Support for VM86 programs to request interrupts for
     63 * real mode hardware drivers:
     64 */
     65#define FIRST_VM86_IRQ		 3
     66#define LAST_VM86_IRQ		15
     67
     68static inline int invalid_vm86_irq(int irq)
     69{
     70	return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ;
     71}
     72
     73void release_vm86_irqs(struct task_struct *);
     74
     75#else
     76
     77#define handle_vm86_fault(a, b)
     78#define release_vm86_irqs(a)
     79
     80static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c)
     81{
     82	return 0;
     83}
     84
     85static inline void save_v86_state(struct kernel_vm86_regs *a, int b) { }
     86
     87#define free_vm86(t) do { } while(0)
     88
     89#endif /* CONFIG_VM86 */
     90
     91#endif /* _ASM_X86_VM86_H */