2 * include/asm-sh/processor.h
4 * Copyright (C) 1999, 2000 Niibe Yutaka
5 * Copyright (C) 2002, 2003 Paul Mundt
8 #ifndef __ASM_SH_PROCESSOR_32_H
9 #define __ASM_SH_PROCESSOR_32_H
12 #include <linux/compiler.h>
13 #include <linux/linkage.h>
15 #include <asm/types.h>
16 #include <asm/ptrace.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 (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
61 * DSP structure and data
63 struct sh_dsp_struct {
64 unsigned long dsp_regs[14];
69 * FPU structure and data
72 struct sh_fpu_hard_struct {
73 unsigned long fp_regs[16];
74 unsigned long xfp_regs[16];
78 long status; /* software status information */
81 /* Dummy fpu emulator */
82 struct sh_fpu_soft_struct {
83 unsigned long fp_regs[16];
84 unsigned long xfp_regs[16];
88 unsigned char lookahead;
89 unsigned long entry_pc;
93 struct sh_fpu_hard_struct hardfpu;
94 struct sh_fpu_soft_struct softfpu;
97 struct thread_struct {
98 /* Saved registers when thread is descheduled */
102 /* Various thread flags, see SH_THREAD_xxx */
105 /* Save middle states of ptrace breakpoints */
106 struct perf_event *ptrace_bps[HBP_NUM];
109 /* Dsp status information */
110 struct sh_dsp_struct dsp_status;
113 /* Extended processor state */
114 union thread_xstate *xstate;
117 #define INIT_THREAD { \
118 .sp = sizeof(init_stack) + (long) &init_stack, \
122 /* Forward declaration, a strange C thing */
125 extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
127 /* Free all resources held by a thread. */
128 extern void release_thread(struct task_struct *);
130 /* Prepare to copy thread state - unlazy all lazy status */
131 void prepare_to_copy(struct task_struct *tsk);
134 * create a kernel thread without removing it from tasklists
136 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
138 /* Copy and release all segment info associated with a VM */
139 #define copy_segments(p, mm) do { } while(0)
140 #define release_segments(mm) do { } while(0)
143 * FPU lazy state save handling.
146 static __inline__ void disable_fpu(void)
148 unsigned long __dummy;
150 /* Set FD flag in SR */
151 __asm__ __volatile__("stc sr, %0\n\t"
158 static __inline__ void enable_fpu(void)
160 unsigned long __dummy;
162 /* Clear out FD flag in SR */
163 __asm__ __volatile__("stc sr, %0\n\t"
170 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
171 #define FPSCR_INIT 0x00080000
173 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
174 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
177 * Return saved PC of a blocked thread.
179 #define thread_saved_pc(tsk) (tsk->thread.pc)
181 void show_trace(struct task_struct *tsk, unsigned long *sp,
182 struct pt_regs *regs);
184 #ifdef CONFIG_DUMP_CODE
185 void show_code(struct pt_regs *regs);
187 static inline void show_code(struct pt_regs *regs)
192 extern unsigned long get_wchan(struct task_struct *p);
194 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
195 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
197 #define user_stack_pointer(_regs) ((_regs)->regs[15])
199 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
200 #define PREFETCH_STRIDE L1_CACHE_BYTES
201 #define ARCH_HAS_PREFETCH
202 #define ARCH_HAS_PREFETCHW
203 static inline void prefetch(void *x)
205 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
208 #define prefetchw(x) prefetch(x)
211 #endif /* __KERNEL__ */
212 #endif /* __ASM_SH_PROCESSOR_32_H */