thread_info.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 *  S390 version
 4 *    Copyright IBM Corp. 2002, 2006
 5 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 6 */
 7
 8#ifndef _ASM_THREAD_INFO_H
 9#define _ASM_THREAD_INFO_H
10
11#include <linux/bits.h>
12#include <vdso/page.h>
13
14/*
15 * General size of kernel stacks
16 */
17#if defined(CONFIG_KASAN) || defined(CONFIG_KMSAN)
18#define THREAD_SIZE_ORDER 4
19#else
20#define THREAD_SIZE_ORDER 2
21#endif
22#define BOOT_STACK_SIZE (PAGE_SIZE << 2)
23#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
24
25#define STACK_INIT_OFFSET (THREAD_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE)
26
27#ifndef __ASSEMBLER__
28
29/*
30 * low level task data that entry.S needs immediate access to
31 * - this struct should fit entirely inside of one cache line
32 * - this struct shares the supervisor stack pages
33 * - if the contents of this structure are changed, the assembly constants must also be changed
34 */
35struct thread_info {
36	unsigned long		flags;		/* low level flags */
37	unsigned long		syscall_work;	/* SYSCALL_WORK_ flags */
38	unsigned int		cpu;		/* current CPU */
39	unsigned char		sie;		/* running in SIE context */
40};
41
42/*
43 * macros/functions for gaining access to the thread information structure
44 */
45#define INIT_THREAD_INFO(tsk)			\
46{						\
47	.flags		= 0,			\
48}
49
50struct task_struct;
51
52void arch_setup_new_exec(void);
53#define arch_setup_new_exec arch_setup_new_exec
54
55#endif
56
57/*
58 * thread information flags bit numbers
59 *
60 * Tell the generic TIF infrastructure which special bits s390 supports
61 */
62#define HAVE_TIF_NEED_RESCHED_LAZY
63#define HAVE_TIF_RESTORE_SIGMASK
64
65#include <asm-generic/thread_info_tif.h>
66
67/* Architecture specific bits */
68#define TIF_ASCE_PRIMARY	16	/* primary asce is kernel asce */
69#define TIF_GUARDED_STORAGE	17	/* load guarded storage control block */
70#define TIF_ISOLATE_BP_GUEST	18	/* Run KVM guests with isolated BP */
71#define TIF_PER_TRAP		19	/* Need to handle PER trap on exit to usermode */
72#define TIF_SINGLE_STEP		21	/* This task is single stepped */
73#define TIF_BLOCK_STEP		22	/* This task is block stepped */
74#define TIF_UPROBE_SINGLESTEP	23	/* This task is uprobe single stepped */
75
76#define _TIF_ASCE_PRIMARY	BIT(TIF_ASCE_PRIMARY)
77#define _TIF_GUARDED_STORAGE	BIT(TIF_GUARDED_STORAGE)
78#define _TIF_ISOLATE_BP_GUEST	BIT(TIF_ISOLATE_BP_GUEST)
79#define _TIF_PER_TRAP		BIT(TIF_PER_TRAP)
80#define _TIF_SINGLE_STEP	BIT(TIF_SINGLE_STEP)
81#define _TIF_BLOCK_STEP		BIT(TIF_BLOCK_STEP)
82#define _TIF_UPROBE_SINGLESTEP	BIT(TIF_UPROBE_SINGLESTEP)
83
84#endif /* _ASM_THREAD_INFO_H */