Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 PAGE_ALIGN(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 address;
125 /* Hardware debugging registers may come here */
126
127 /* floating point info */
128 union thread_xstate *xstate;
129};
130
131#define INIT_MMAP \
132{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
133
134#define INIT_THREAD { \
135 .sp = sizeof(init_stack) + \
136 (long) &init_stack, \
137 .pc = 0, \
138 .kregs = &fake_swapper_regs, \
139 .uregs = NULL, \
140 .address = 0, \
141 .flags = 0, \
142}
143
144/*
145 * Do necessary setup to start up a newly executed thread.
146 */
147#define SR_USER (SR_MMU | SR_FD)
148
149#define start_thread(_regs, new_pc, new_sp) \
150 _regs->sr = SR_USER; /* User mode. */ \
151 _regs->pc = new_pc - 4; /* Compensate syscall exit */ \
152 _regs->pc |= 1; /* Set SHmedia ! */ \
153 _regs->regs[18] = 0; \
154 _regs->regs[15] = new_sp
155
156/* Forward declaration, a strange C thing */
157struct task_struct;
158struct mm_struct;
159
160/* Free all resources held by a thread. */
161extern void release_thread(struct task_struct *);
162
163/* Copy and release all segment info associated with a VM */
164#define copy_segments(p, mm) do { } while (0)
165#define release_segments(mm) do { } while (0)
166#define forget_segments() do { } while (0)
167/*
168 * FPU lazy state save handling.
169 */
170
171static inline void disable_fpu(void)
172{
173 unsigned long long __dummy;
174
175 /* Set FD flag in SR */
176 __asm__ __volatile__("getcon " __SR ", %0\n\t"
177 "or %0, %1, %0\n\t"
178 "putcon %0, " __SR "\n\t"
179 : "=&r" (__dummy)
180 : "r" (SR_FD));
181}
182
183static inline void enable_fpu(void)
184{
185 unsigned long long __dummy;
186
187 /* Clear out FD flag in SR */
188 __asm__ __volatile__("getcon " __SR ", %0\n\t"
189 "and %0, %1, %0\n\t"
190 "putcon %0, " __SR "\n\t"
191 : "=&r" (__dummy)
192 : "r" (~SR_FD));
193}
194
195/* Round to nearest, no exceptions on inexact, overflow, underflow,
196 zero-divide, invalid. Configure option for whether to flush denorms to
197 zero, or except if a denorm is encountered. */
198#if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
199#define FPSCR_INIT 0x00040000
200#else
201#define FPSCR_INIT 0x00000000
202#endif
203
204#ifdef CONFIG_SH_FPU
205/* Initialise the FP state of a task */
206void fpinit(struct sh_fpu_hard_struct *fpregs);
207#else
208#define fpinit(fpregs) do { } while (0)
209#endif
210
211extern struct task_struct *last_task_used_math;
212
213/*
214 * Return saved PC of a blocked thread.
215 */
216#define thread_saved_pc(tsk) (tsk->thread.pc)
217
218extern unsigned long get_wchan(struct task_struct *p);
219
220#define KSTK_EIP(tsk) ((tsk)->thread.pc)
221#define KSTK_ESP(tsk) ((tsk)->thread.sp)
222
223#endif /* __ASSEMBLY__ */
224#endif /* __ASM_SH_PROCESSOR_64_H */