tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * include/asm-h8300/processor.h
4 *
5 * Copyright (C) 2002 Yoshinori Sato
6 *
7 * Based on: linux/asm-m68nommu/processor.h
8 *
9 * Copyright (C) 1995 Hamish Macdonald
10 */
11
12#ifndef __ASM_H8300_PROCESSOR_H
13#define __ASM_H8300_PROCESSOR_H
14
15#include <linux/compiler.h>
16#include <asm/ptrace.h>
17#include <asm/current.h>
18
19static inline unsigned long rdusp(void)
20{
21 extern unsigned int _sw_usp;
22
23 return _sw_usp;
24}
25
26static inline void wrusp(unsigned long usp)
27{
28 extern unsigned int _sw_usp;
29
30 _sw_usp = usp;
31}
32
33/*
34 * User space process size: 3.75GB. This is hardcoded into a few places,
35 * so don't change it unless you know what you are doing.
36 */
37#define TASK_SIZE (0xFFFFFFFFUL)
38
39#ifdef __KERNEL__
40#define STACK_TOP TASK_SIZE
41#define STACK_TOP_MAX STACK_TOP
42#endif
43
44/*
45 * This decides where the kernel will search for a free chunk of vm
46 * space during mmap's. We won't be using it
47 */
48#define TASK_UNMAPPED_BASE 0
49
50struct thread_struct {
51 unsigned long ksp; /* kernel stack pointer */
52 unsigned long usp; /* user stack pointer */
53 unsigned long ccr; /* saved status register */
54 unsigned long esp0; /* points to SR of stack frame */
55 struct {
56 unsigned short *addr;
57 unsigned short inst;
58 } breakinfo;
59};
60
61#define INIT_THREAD { \
62 .ksp = sizeof(init_stack) + (unsigned long)init_stack, \
63 .usp = 0, \
64 .ccr = PS_S, \
65 .esp0 = 0, \
66 .breakinfo = { \
67 .addr = (unsigned short *)-1, \
68 .inst = 0 \
69 } \
70}
71
72/*
73 * Do necessary setup to start up a newly executed thread.
74 *
75 * pass the data segment into user programs if it exists,
76 * it can't hurt anything as far as I can tell
77 */
78#if defined(CONFIG_CPU_H8300H)
79#define start_thread(_regs, _pc, _usp) \
80do { \
81 (_regs)->pc = (_pc); \
82 (_regs)->ccr = 0x00; /* clear all flags */ \
83 (_regs)->er5 = current->mm->start_data; /* GOT base */ \
84 (_regs)->sp = ((unsigned long)(_usp)) - sizeof(unsigned long) * 3; \
85} while (0)
86#endif
87#if defined(CONFIG_CPU_H8S)
88#define start_thread(_regs, _pc, _usp) \
89do { \
90 (_regs)->pc = (_pc); \
91 (_regs)->ccr = 0x00; /* clear kernel flag */ \
92 (_regs)->exr = 0x78; /* enable all interrupts */ \
93 (_regs)->er5 = current->mm->start_data; /* GOT base */ \
94 /* 14 = space for retaddr(4), vector(4), er0(4) and exr(2) on stack */ \
95 (_regs)->sp = ((unsigned long)(_usp)) - 14; \
96} while (0)
97#endif
98
99/* Forward declaration, a strange C thing */
100struct task_struct;
101
102/* Free all resources held by a thread. */
103static inline void release_thread(struct task_struct *dead_task)
104{
105}
106
107unsigned long __get_wchan(struct task_struct *p);
108
109#define KSTK_EIP(tsk) \
110 ({ \
111 unsigned long eip = 0; \
112 if ((tsk)->thread.esp0 > PAGE_SIZE && \
113 MAP_NR((tsk)->thread.esp0) < max_mapnr) \
114 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
115 eip; })
116
117#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
118
119#define cpu_relax() barrier()
120
121#define HARD_RESET_NOW() ({ \
122 local_irq_disable(); \
123 asm("jmp @@0"); \
124})
125
126#endif