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1#ifndef __ASM_SH_PROCESSOR_64_H
2#define __ASM_SH_PROCESSOR_64_H
3
4/*
5 * include/asm-sh/processor_64.h
6 *
7 * Copyright (C) 2000, 2001 Paolo Alberelli
8 * Copyright (C) 2003 Paul Mundt
9 * Copyright (C) 2004 Richard Curnow
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file "COPYING" in the main directory of this archive
13 * for more details.
14 */
15#ifndef __ASSEMBLY__
16
17#include <linux/compiler.h>
18#include <asm/page.h>
19#include <asm/types.h>
20#include <cpu/registers.h>
21
22/*
23 * Default implementation of macro that returns current
24 * instruction pointer ("program counter").
25 */
26#define current_text_addr() ({ \
27void *pc; \
28unsigned long long __dummy = 0; \
29__asm__("gettr tr0, %1\n\t" \
30 "pta 4, tr0\n\t" \
31 "gettr tr0, %0\n\t" \
32 "ptabs %1, tr0\n\t" \
33 :"=r" (pc), "=r" (__dummy) \
34 : "1" (__dummy)); \
35pc; })
36
37#endif
38
39/*
40 * User space process size: 2GB - 4k.
41 */
42#define TASK_SIZE 0x7ffff000UL
43
44#define STACK_TOP TASK_SIZE
45#define STACK_TOP_MAX STACK_TOP
46
47/* This decides where the kernel will search for a free chunk of vm
48 * space during mmap's.
49 */
50#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
51
52/*
53 * Bit of SR register
54 *
55 * FD-bit:
56 * When it's set, it means the processor doesn't have right to use FPU,
57 * and it results exception when the floating operation is executed.
58 *
59 * IMASK-bit:
60 * Interrupt level mask
61 *
62 * STEP-bit:
63 * Single step bit
64 *
65 */
66#if defined(CONFIG_SH64_SR_WATCH)
67#define SR_MMU 0x84000000
68#else
69#define SR_MMU 0x80000000
70#endif
71
72#define SR_IMASK 0x000000f0
73#define SR_FD 0x00008000
74#define SR_SSTEP 0x08000000
75
76#ifndef __ASSEMBLY__
77
78/*
79 * FPU structure and data : require 8-byte alignment as we need to access it
80 with fld.p, fst.p
81 */
82
83struct sh_fpu_hard_struct {
84 unsigned long fp_regs[64];
85 unsigned int fpscr;
86 /* long status; * software status information */
87};
88
89/* Dummy fpu emulator */
90struct sh_fpu_soft_struct {
91 unsigned long fp_regs[64];
92 unsigned int fpscr;
93 unsigned char lookahead;
94 unsigned long entry_pc;
95};
96
97union thread_xstate {
98 struct sh_fpu_hard_struct hardfpu;
99 struct sh_fpu_soft_struct softfpu;
100 /*
101 * The structure definitions only produce 32 bit alignment, yet we need
102 * to access them using 64 bit load/store as well.
103 */
104 unsigned long long alignment_dummy;
105};
106
107struct thread_struct {
108 unsigned long sp;
109 unsigned long pc;
110
111 /* Various thread flags, see SH_THREAD_xxx */
112 unsigned long flags;
113
114 /* This stores the address of the pt_regs built during a context
115 switch, or of the register save area built for a kernel mode
116 exception. It is used for backtracing the stack of a sleeping task
117 or one that traps in kernel mode. */
118 struct pt_regs *kregs;
119 /* This stores the address of the pt_regs constructed on entry from
120 user mode. It is a fixed value over the lifetime of a process, or
121 NULL for a kernel thread. */
122 struct pt_regs *uregs;
123
124 unsigned long trap_no, error_code;
125 unsigned long address;
126 /* Hardware debugging registers may come here */
127
128 /* floating point info */
129 union thread_xstate *xstate;
130};
131
132#define INIT_MMAP \
133{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
134
135#define INIT_THREAD { \
136 .sp = sizeof(init_stack) + \
137 (long) &init_stack, \
138 .pc = 0, \
139 .kregs = &fake_swapper_regs, \
140 .uregs = NULL, \
141 .trap_no = 0, \
142 .error_code = 0, \
143 .address = 0, \
144 .flags = 0, \
145}
146
147/*
148 * Do necessary setup to start up a newly executed thread.
149 */
150#define SR_USER (SR_MMU | SR_FD)
151
152#define start_thread(_regs, new_pc, new_sp) \
153 _regs->sr = SR_USER; /* User mode. */ \
154 _regs->pc = new_pc - 4; /* Compensate syscall exit */ \
155 _regs->pc |= 1; /* Set SHmedia ! */ \
156 _regs->regs[18] = 0; \
157 _regs->regs[15] = new_sp
158
159/* Forward declaration, a strange C thing */
160struct task_struct;
161struct mm_struct;
162
163/* Free all resources held by a thread. */
164extern void release_thread(struct task_struct *);
165/*
166 * create a kernel thread without removing it from tasklists
167 */
168extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
169
170
171/* Copy and release all segment info associated with a VM */
172#define copy_segments(p, mm) do { } while (0)
173#define release_segments(mm) do { } while (0)
174#define forget_segments() do { } while (0)
175#define prepare_to_copy(tsk) do { } while (0)
176/*
177 * FPU lazy state save handling.
178 */
179
180static inline void disable_fpu(void)
181{
182 unsigned long long __dummy;
183
184 /* Set FD flag in SR */
185 __asm__ __volatile__("getcon " __SR ", %0\n\t"
186 "or %0, %1, %0\n\t"
187 "putcon %0, " __SR "\n\t"
188 : "=&r" (__dummy)
189 : "r" (SR_FD));
190}
191
192static inline void enable_fpu(void)
193{
194 unsigned long long __dummy;
195
196 /* Clear out FD flag in SR */
197 __asm__ __volatile__("getcon " __SR ", %0\n\t"
198 "and %0, %1, %0\n\t"
199 "putcon %0, " __SR "\n\t"
200 : "=&r" (__dummy)
201 : "r" (~SR_FD));
202}
203
204/* Round to nearest, no exceptions on inexact, overflow, underflow,
205 zero-divide, invalid. Configure option for whether to flush denorms to
206 zero, or except if a denorm is encountered. */
207#if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
208#define FPSCR_INIT 0x00040000
209#else
210#define FPSCR_INIT 0x00000000
211#endif
212
213#ifdef CONFIG_SH_FPU
214/* Initialise the FP state of a task */
215void fpinit(struct sh_fpu_hard_struct *fpregs);
216#else
217#define fpinit(fpregs) do { } while (0)
218#endif
219
220extern struct task_struct *last_task_used_math;
221
222/*
223 * Return saved PC of a blocked thread.
224 */
225#define thread_saved_pc(tsk) (tsk->thread.pc)
226
227extern unsigned long get_wchan(struct task_struct *p);
228
229#define KSTK_EIP(tsk) ((tsk)->thread.pc)
230#define KSTK_ESP(tsk) ((tsk)->thread.sp)
231
232#endif /* __ASSEMBLY__ */
233#endif /* __ASM_SH_PROCESSOR_64_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_PROCESSOR_64_H
3#define __ASM_SH_PROCESSOR_64_H
4
5/*
6 * include/asm-sh/processor_64.h
7 *
8 * Copyright (C) 2000, 2001 Paolo Alberelli
9 * Copyright (C) 2003 Paul Mundt
10 * Copyright (C) 2004 Richard Curnow
11 */
12#ifndef __ASSEMBLY__
13
14#include <linux/compiler.h>
15#include <asm/page.h>
16#include <asm/types.h>
17#include <cpu/registers.h>
18
19#endif
20
21/*
22 * User space process size: 2GB - 4k.
23 */
24#define TASK_SIZE 0x7ffff000UL
25
26#define STACK_TOP TASK_SIZE
27#define STACK_TOP_MAX STACK_TOP
28
29/* This decides where the kernel will search for a free chunk of vm
30 * space during mmap's.
31 */
32#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
33
34/*
35 * Bit of SR register
36 *
37 * FD-bit:
38 * When it's set, it means the processor doesn't have right to use FPU,
39 * and it results exception when the floating operation is executed.
40 *
41 * IMASK-bit:
42 * Interrupt level mask
43 *
44 * STEP-bit:
45 * Single step bit
46 *
47 */
48#if defined(CONFIG_SH64_SR_WATCH)
49#define SR_MMU 0x84000000
50#else
51#define SR_MMU 0x80000000
52#endif
53
54#define SR_IMASK 0x000000f0
55#define SR_FD 0x00008000
56#define SR_SSTEP 0x08000000
57
58#ifndef __ASSEMBLY__
59
60/*
61 * FPU structure and data : require 8-byte alignment as we need to access it
62 with fld.p, fst.p
63 */
64
65struct sh_fpu_hard_struct {
66 unsigned long fp_regs[64];
67 unsigned int fpscr;
68 /* long status; * software status information */
69};
70
71/* Dummy fpu emulator */
72struct sh_fpu_soft_struct {
73 unsigned long fp_regs[64];
74 unsigned int fpscr;
75 unsigned char lookahead;
76 unsigned long entry_pc;
77};
78
79union thread_xstate {
80 struct sh_fpu_hard_struct hardfpu;
81 struct sh_fpu_soft_struct softfpu;
82 /*
83 * The structure definitions only produce 32 bit alignment, yet we need
84 * to access them using 64 bit load/store as well.
85 */
86 unsigned long long alignment_dummy;
87};
88
89struct thread_struct {
90 unsigned long sp;
91 unsigned long pc;
92
93 /* Various thread flags, see SH_THREAD_xxx */
94 unsigned long flags;
95
96 /* This stores the address of the pt_regs built during a context
97 switch, or of the register save area built for a kernel mode
98 exception. It is used for backtracing the stack of a sleeping task
99 or one that traps in kernel mode. */
100 struct pt_regs *kregs;
101 /* This stores the address of the pt_regs constructed on entry from
102 user mode. It is a fixed value over the lifetime of a process, or
103 NULL for a kernel thread. */
104 struct pt_regs *uregs;
105
106 unsigned long address;
107 /* Hardware debugging registers may come here */
108
109 /* floating point info */
110 union thread_xstate *xstate;
111
112 /*
113 * fpu_counter contains the number of consecutive context switches
114 * that the FPU is used. If this is over a threshold, the lazy fpu
115 * saving becomes unlazy to save the trap. This is an unsigned char
116 * so that after 256 times the counter wraps and the behavior turns
117 * lazy again; this to deal with bursty apps that only use FPU for
118 * a short time
119 */
120 unsigned char fpu_counter;
121};
122
123#define INIT_MMAP \
124{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
125
126#define INIT_THREAD { \
127 .sp = sizeof(init_stack) + \
128 (long) &init_stack, \
129 .pc = 0, \
130 .kregs = &fake_swapper_regs, \
131 .uregs = NULL, \
132 .address = 0, \
133 .flags = 0, \
134}
135
136/*
137 * Do necessary setup to start up a newly executed thread.
138 */
139#define SR_USER (SR_MMU | SR_FD)
140
141#define start_thread(_regs, new_pc, new_sp) \
142 _regs->sr = SR_USER; /* User mode. */ \
143 _regs->pc = new_pc - 4; /* Compensate syscall exit */ \
144 _regs->pc |= 1; /* Set SHmedia ! */ \
145 _regs->regs[18] = 0; \
146 _regs->regs[15] = new_sp
147
148/* Forward declaration, a strange C thing */
149struct task_struct;
150struct mm_struct;
151
152/* Free all resources held by a thread. */
153extern void release_thread(struct task_struct *);
154
155/*
156 * FPU lazy state save handling.
157 */
158
159static inline void disable_fpu(void)
160{
161 unsigned long long __dummy;
162
163 /* Set FD flag in SR */
164 __asm__ __volatile__("getcon " __SR ", %0\n\t"
165 "or %0, %1, %0\n\t"
166 "putcon %0, " __SR "\n\t"
167 : "=&r" (__dummy)
168 : "r" (SR_FD));
169}
170
171static inline void enable_fpu(void)
172{
173 unsigned long long __dummy;
174
175 /* Clear out FD flag in SR */
176 __asm__ __volatile__("getcon " __SR ", %0\n\t"
177 "and %0, %1, %0\n\t"
178 "putcon %0, " __SR "\n\t"
179 : "=&r" (__dummy)
180 : "r" (~SR_FD));
181}
182
183/* Round to nearest, no exceptions on inexact, overflow, underflow,
184 zero-divide, invalid. Configure option for whether to flush denorms to
185 zero, or except if a denorm is encountered. */
186#if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
187#define FPSCR_INIT 0x00040000
188#else
189#define FPSCR_INIT 0x00000000
190#endif
191
192#ifdef CONFIG_SH_FPU
193/* Initialise the FP state of a task */
194void fpinit(struct sh_fpu_hard_struct *fpregs);
195#else
196#define fpinit(fpregs) do { } while (0)
197#endif
198
199extern struct task_struct *last_task_used_math;
200
201/*
202 * Return saved PC of a blocked thread.
203 */
204#define thread_saved_pc(tsk) (tsk->thread.pc)
205
206extern unsigned long get_wchan(struct task_struct *p);
207
208#define KSTK_EIP(tsk) ((tsk)->thread.pc)
209#define KSTK_ESP(tsk) ((tsk)->thread.sp)
210
211#endif /* __ASSEMBLY__ */
212#endif /* __ASM_SH_PROCESSOR_64_H */