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_H
9 #define __ASM_SH_PROCESSOR_H
12 #include <linux/compiler.h>
14 #include <asm/types.h>
15 #include <asm/cache.h>
16 #include <asm/ptrace.h>
17 #include <asm/cpu-features.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\n1:":"=z" (pc)); pc; })
25 /* Core Processor Version Register */
26 #define CCN_PVR 0xff000030
27 #define CCN_CVR 0xff000040
28 #define CCN_PRR 0xff000044
30 const char *get_cpu_subtype(void);
33 * CPU type and hardware bug flags. Kept separately for each CPU.
35 * Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
36 * in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c
37 * for parsing the subtype in get_cpu_subtype().
41 CPU_SH7604, CPU_SH7619,
47 CPU_SH7705, CPU_SH7706, CPU_SH7707,
48 CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
49 CPU_SH7709, CPU_SH7709A, CPU_SH7710,
50 CPU_SH7729, CPU_SH7300,
53 CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
54 CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
57 CPU_SH7770, CPU_SH7780, CPU_SH7781, CPU_SH7785,
60 CPU_SH73180, CPU_SH7343, CPU_SH7722,
68 unsigned long loops_per_jiffy;
70 struct cache_info icache; /* Primary I-cache */
71 struct cache_info dcache; /* Primary D-cache */
72 struct cache_info scache; /* Secondary cache */
75 } __attribute__ ((aligned(SMP_CACHE_BYTES)));
77 extern struct sh_cpuinfo boot_cpu_data;
80 extern struct sh_cpuinfo cpu_data[];
81 #define current_cpu_data cpu_data[smp_processor_id()]
83 #define cpu_data (&boot_cpu_data)
84 #define current_cpu_data boot_cpu_data
88 * User space process size: 2GB.
90 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
92 #define TASK_SIZE 0x7c000000UL
94 /* This decides where the kernel will search for a free chunk of vm
95 * space during mmap's.
97 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
103 * When it's set, it means the processor doesn't have right to use FPU,
104 * and it results exception when the floating operation is executed.
107 * Interrupt level mask
109 #define SR_FD 0x00008000
110 #define SR_DSP 0x00001000
111 #define SR_IMASK 0x000000f0
114 * FPU structure and data
117 struct sh_fpu_hard_struct {
118 unsigned long fp_regs[16];
119 unsigned long xfp_regs[16];
123 long status; /* software status information */
126 /* Dummy fpu emulator */
127 struct sh_fpu_soft_struct {
128 unsigned long fp_regs[16];
129 unsigned long xfp_regs[16];
133 unsigned char lookahead;
134 unsigned long entry_pc;
138 struct sh_fpu_hard_struct hard;
139 struct sh_fpu_soft_struct soft;
142 struct thread_struct {
143 /* Saved registers when thread is descheduled */
147 /* Hardware debugging registers */
148 unsigned long ubc_pc;
150 /* floating point info */
151 union sh_fpu_union fpu;
158 /* Count of active tasks with UBC settings */
159 extern int ubc_usercnt;
161 #define INIT_THREAD { \
162 .sp = sizeof(init_stack) + (long) &init_stack, \
166 * Do necessary setup to start up a newly executed thread.
168 #define start_thread(regs, new_pc, new_sp) \
171 regs->sr = SR_FD; /* User mode. */ \
173 regs->regs[15] = new_sp
175 /* Forward declaration, a strange C thing */
179 /* Free all resources held by a thread. */
180 extern void release_thread(struct task_struct *);
182 /* Prepare to copy thread state - unlazy all lazy status */
183 #define prepare_to_copy(tsk) do { } while (0)
186 * create a kernel thread without removing it from tasklists
188 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
190 /* Copy and release all segment info associated with a VM */
191 #define copy_segments(p, mm) do { } while(0)
192 #define release_segments(mm) do { } while(0)
195 * FPU lazy state save handling.
198 static __inline__ void disable_fpu(void)
200 unsigned long __dummy;
202 /* Set FD flag in SR */
203 __asm__ __volatile__("stc sr, %0\n\t"
210 static __inline__ void enable_fpu(void)
212 unsigned long __dummy;
214 /* Clear out FD flag in SR */
215 __asm__ __volatile__("stc sr, %0\n\t"
222 static __inline__ void release_fpu(struct pt_regs *regs)
227 static __inline__ void grab_fpu(struct pt_regs *regs)
232 #ifdef CONFIG_CPU_SH4
233 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
235 #define save_fpu(tsk) do { } while (0)
238 #define unlazy_fpu(tsk, regs) do { \
239 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
240 save_fpu(tsk, regs); \
244 #define clear_fpu(tsk, regs) do { \
245 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
246 clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
251 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
252 #define FPSCR_INIT 0x00080000
254 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
255 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
258 * Return saved PC of a blocked thread.
260 #define thread_saved_pc(tsk) (tsk->thread.pc)
262 void show_trace(struct task_struct *tsk, unsigned long *sp,
263 struct pt_regs *regs);
264 extern unsigned long get_wchan(struct task_struct *p);
266 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
267 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
269 #define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
270 #define cpu_relax() barrier()
272 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
273 defined(CONFIG_CPU_SH4)
274 #define PREFETCH_STRIDE L1_CACHE_BYTES
275 #define ARCH_HAS_PREFETCH
276 #define ARCH_HAS_PREFETCHW
277 static inline void prefetch(void *x)
279 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
282 #define prefetchw(x) prefetch(x)
285 #ifdef CONFIG_VSYSCALL
286 extern int vsyscall_init(void);
288 #define vsyscall_init() do { } while (0)
291 #endif /* __KERNEL__ */
292 #endif /* __ASM_SH_PROCESSOR_H */