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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * include/asm-sh/processor.h
4 *
5 * Copyright (C) 1999, 2000 Niibe Yutaka
6 * Copyright (C) 2002, 2003 Paul Mundt
7 */
8
9#ifndef __ASM_SH_PROCESSOR_32_H
10#define __ASM_SH_PROCESSOR_32_H
11
12#include <linux/compiler.h>
13#include <linux/linkage.h>
14#include <asm/page.h>
15#include <asm/types.h>
16#include <asm/hw_breakpoint.h>
17
18/* Core Processor Version Register */
19#define CCN_PVR 0xff000030
20#define CCN_CVR 0xff000040
21#define CCN_PRR 0xff000044
22
23/*
24 * User space process size: 2GB.
25 *
26 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
27 */
28#define TASK_SIZE 0x7c000000UL
29
30#define STACK_TOP TASK_SIZE
31#define STACK_TOP_MAX STACK_TOP
32
33/* This decides where the kernel will search for a free chunk of vm
34 * space during mmap's.
35 */
36#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
37
38/*
39 * Bit of SR register
40 *
41 * FD-bit:
42 * When it's set, it means the processor doesn't have right to use FPU,
43 * and it results exception when the floating operation is executed.
44 *
45 * IMASK-bit:
46 * Interrupt level mask
47 */
48#define SR_DSP 0x00001000
49#define SR_IMASK 0x000000f0
50#define SR_FD 0x00008000
51#define SR_MD 0x40000000
52
53/*
54 * DSP structure and data
55 */
56struct sh_dsp_struct {
57 unsigned long dsp_regs[14];
58 long status;
59};
60
61/*
62 * FPU structure and data
63 */
64
65struct sh_fpu_hard_struct {
66 unsigned long fp_regs[16];
67 unsigned long xfp_regs[16];
68 unsigned long fpscr;
69 unsigned long fpul;
70
71 long status; /* software status information */
72};
73
74/* Dummy fpu emulator */
75struct sh_fpu_soft_struct {
76 unsigned long fp_regs[16];
77 unsigned long xfp_regs[16];
78 unsigned long fpscr;
79 unsigned long fpul;
80
81 unsigned char lookahead;
82 unsigned long entry_pc;
83};
84
85union thread_xstate {
86 struct sh_fpu_hard_struct hardfpu;
87 struct sh_fpu_soft_struct softfpu;
88};
89
90struct thread_struct {
91 /* Saved registers when thread is descheduled */
92 unsigned long sp;
93 unsigned long pc;
94
95 /* Various thread flags, see SH_THREAD_xxx */
96 unsigned long flags;
97
98 /* Save middle states of ptrace breakpoints */
99 struct perf_event *ptrace_bps[HBP_NUM];
100
101#ifdef CONFIG_SH_DSP
102 /* Dsp status information */
103 struct sh_dsp_struct dsp_status;
104#endif
105
106 /* Extended processor state */
107 union thread_xstate *xstate;
108
109 /*
110 * fpu_counter contains the number of consecutive context switches
111 * that the FPU is used. If this is over a threshold, the lazy fpu
112 * saving becomes unlazy to save the trap. This is an unsigned char
113 * so that after 256 times the counter wraps and the behavior turns
114 * lazy again; this to deal with bursty apps that only use FPU for
115 * a short time
116 */
117 unsigned char fpu_counter;
118};
119
120#define INIT_THREAD { \
121 .sp = sizeof(init_stack) + (long) &init_stack, \
122 .flags = 0, \
123}
124
125/* Forward declaration, a strange C thing */
126struct task_struct;
127
128extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
129
130/*
131 * FPU lazy state save handling.
132 */
133
134static __inline__ void disable_fpu(void)
135{
136 unsigned long __dummy;
137
138 /* Set FD flag in SR */
139 __asm__ __volatile__("stc sr, %0\n\t"
140 "or %1, %0\n\t"
141 "ldc %0, sr"
142 : "=&r" (__dummy)
143 : "r" (SR_FD));
144}
145
146static __inline__ void enable_fpu(void)
147{
148 unsigned long __dummy;
149
150 /* Clear out FD flag in SR */
151 __asm__ __volatile__("stc sr, %0\n\t"
152 "and %1, %0\n\t"
153 "ldc %0, sr"
154 : "=&r" (__dummy)
155 : "r" (~SR_FD));
156}
157
158/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
159#define FPSCR_INIT 0x00080000
160
161#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
162#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
163
164/*
165 * Return saved PC of a blocked thread.
166 */
167#define thread_saved_pc(tsk) (tsk->thread.pc)
168
169void show_trace(struct task_struct *tsk, unsigned long *sp,
170 struct pt_regs *regs, const char *loglvl);
171
172#ifdef CONFIG_DUMP_CODE
173void show_code(struct pt_regs *regs);
174#else
175static inline void show_code(struct pt_regs *regs)
176{
177}
178#endif
179
180extern unsigned long __get_wchan(struct task_struct *p);
181
182#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
183#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
184
185#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
186
187#define PREFETCH_STRIDE L1_CACHE_BYTES
188#define ARCH_HAS_PREFETCH
189#define ARCH_HAS_PREFETCHW
190
191static inline void prefetch(const void *x)
192{
193 __builtin_prefetch(x, 0, 3);
194}
195
196static inline void prefetchw(const void *x)
197{
198 __builtin_prefetch(x, 1, 3);
199}
200#endif
201
202#endif /* __ASM_SH_PROCESSOR_32_H */