1 /* SPDX-License-Identifier: GPL-2.0 */
3 * include/asm-sh/processor.h
5 * Copyright (C) 1999, 2000 Niibe Yutaka
6 * Copyright (C) 2002, 2003 Paul Mundt
9 #ifndef __ASM_SH_PROCESSOR_32_H
10 #define __ASM_SH_PROCESSOR_32_H
13 #include <linux/compiler.h>
14 #include <linux/linkage.h>
16 #include <asm/types.h>
17 #include <asm/hw_breakpoint.h>
20 * Default implementation of macro that returns current
21 * instruction pointer ("program counter").
23 #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n.align 2\n1:":"=z" (pc)); pc; })
25 /* Core Processor Version Register */
26 #define CCN_PVR 0xff000030
27 #define CCN_CVR 0xff000040
28 #define CCN_PRR 0xff000044
31 * User space process size: 2GB.
33 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
35 #define TASK_SIZE 0x7c000000UL
37 #define STACK_TOP TASK_SIZE
38 #define STACK_TOP_MAX STACK_TOP
40 /* This decides where the kernel will search for a free chunk of vm
41 * space during mmap's.
43 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
49 * When it's set, it means the processor doesn't have right to use FPU,
50 * and it results exception when the floating operation is executed.
53 * Interrupt level mask
55 #define SR_DSP 0x00001000
56 #define SR_IMASK 0x000000f0
57 #define SR_FD 0x00008000
58 #define SR_MD 0x40000000
60 #define SR_USER_MASK 0x00000303 // M, Q, S, T bits
62 * DSP structure and data
64 struct sh_dsp_struct {
65 unsigned long dsp_regs[14];
70 * FPU structure and data
73 struct sh_fpu_hard_struct {
74 unsigned long fp_regs[16];
75 unsigned long xfp_regs[16];
79 long status; /* software status information */
82 /* Dummy fpu emulator */
83 struct sh_fpu_soft_struct {
84 unsigned long fp_regs[16];
85 unsigned long xfp_regs[16];
89 unsigned char lookahead;
90 unsigned long entry_pc;
94 struct sh_fpu_hard_struct hardfpu;
95 struct sh_fpu_soft_struct softfpu;
98 struct thread_struct {
99 /* Saved registers when thread is descheduled */
103 /* Various thread flags, see SH_THREAD_xxx */
106 /* Save middle states of ptrace breakpoints */
107 struct perf_event *ptrace_bps[HBP_NUM];
110 /* Dsp status information */
111 struct sh_dsp_struct dsp_status;
114 /* Extended processor state */
115 union thread_xstate *xstate;
118 * fpu_counter contains the number of consecutive context switches
119 * that the FPU is used. If this is over a threshold, the lazy fpu
120 * saving becomes unlazy to save the trap. This is an unsigned char
121 * so that after 256 times the counter wraps and the behavior turns
122 * lazy again; this to deal with bursty apps that only use FPU for
125 unsigned char fpu_counter;
128 #define INIT_THREAD { \
129 .sp = sizeof(init_stack) + (long) &init_stack, \
133 /* Forward declaration, a strange C thing */
136 extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
138 /* Free all resources held by a thread. */
139 extern void release_thread(struct task_struct *);
142 * FPU lazy state save handling.
145 static __inline__ void disable_fpu(void)
147 unsigned long __dummy;
149 /* Set FD flag in SR */
150 __asm__ __volatile__("stc sr, %0\n\t"
157 static __inline__ void enable_fpu(void)
159 unsigned long __dummy;
161 /* Clear out FD flag in SR */
162 __asm__ __volatile__("stc sr, %0\n\t"
169 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
170 #define FPSCR_INIT 0x00080000
172 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
173 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
176 * Return saved PC of a blocked thread.
178 #define thread_saved_pc(tsk) (tsk->thread.pc)
180 void show_trace(struct task_struct *tsk, unsigned long *sp,
181 struct pt_regs *regs);
183 #ifdef CONFIG_DUMP_CODE
184 void show_code(struct pt_regs *regs);
186 static inline void show_code(struct pt_regs *regs)
191 extern unsigned long get_wchan(struct task_struct *p);
193 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
194 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
196 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
198 #define PREFETCH_STRIDE L1_CACHE_BYTES
199 #define ARCH_HAS_PREFETCH
200 #define ARCH_HAS_PREFETCHW
202 static inline void prefetch(const void *x)
204 __builtin_prefetch(x, 0, 3);
207 static inline void prefetchw(const void *x)
209 __builtin_prefetch(x, 1, 3);
213 #endif /* __KERNEL__ */
214 #endif /* __ASM_SH_PROCESSOR_32_H */