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>
13 #include <linux/smp.h>
15 #include <asm/types.h>
16 #include <asm/cache.h>
17 #include <asm/ptrace.h>
18 #include <asm/cpu-features.h>
21 * Default implementation of macro that returns current
22 * instruction pointer ("program counter").
24 #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n1:":"=z" (pc)); pc; })
26 /* Core Processor Version Register */
27 #define CCN_PVR 0xff000030
28 #define CCN_CVR 0xff000040
29 #define CCN_PRR 0xff000044
32 * CPU type and hardware bug flags. Kept separately for each CPU.
34 * Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
35 * in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c
36 * for parsing the subtype in get_cpu_subtype().
46 CPU_SH7705, CPU_SH7706, CPU_SH7707,
47 CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
48 CPU_SH7709, CPU_SH7709A, CPU_SH7710, CPU_SH7712,
49 CPU_SH7720, CPU_SH7729,
52 CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
53 CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
56 CPU_SH7770, CPU_SH7780, CPU_SH7781, CPU_SH7785, CPU_SHX3,
59 CPU_SH7343, CPU_SH7722,
67 unsigned long loops_per_jiffy;
68 unsigned long asid_cache;
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 cpu_data[];
78 #define boot_cpu_data cpu_data[0]
79 #define current_cpu_data cpu_data[smp_processor_id()]
80 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
83 * User space process size: 2GB.
85 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
87 #define TASK_SIZE 0x7c000000UL
89 /* This decides where the kernel will search for a free chunk of vm
90 * space during mmap's.
92 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
98 * When it's set, it means the processor doesn't have right to use FPU,
99 * and it results exception when the floating operation is executed.
102 * Interrupt level mask
104 #define SR_FD 0x00008000
105 #define SR_DSP 0x00001000
106 #define SR_IMASK 0x000000f0
109 * FPU structure and data
112 struct sh_fpu_hard_struct {
113 unsigned long fp_regs[16];
114 unsigned long xfp_regs[16];
118 long status; /* software status information */
121 /* Dummy fpu emulator */
122 struct sh_fpu_soft_struct {
123 unsigned long fp_regs[16];
124 unsigned long xfp_regs[16];
128 unsigned char lookahead;
129 unsigned long entry_pc;
133 struct sh_fpu_hard_struct hard;
134 struct sh_fpu_soft_struct soft;
137 struct thread_struct {
138 /* Saved registers when thread is descheduled */
142 /* Hardware debugging registers */
143 unsigned long ubc_pc;
145 /* floating point info */
146 union sh_fpu_union fpu;
153 /* Count of active tasks with UBC settings */
154 extern int ubc_usercnt;
156 #define INIT_THREAD { \
157 .sp = sizeof(init_stack) + (long) &init_stack, \
161 * Do necessary setup to start up a newly executed thread.
163 #define start_thread(regs, new_pc, new_sp) \
166 regs->sr = SR_FD; /* User mode. */ \
168 regs->regs[15] = new_sp
170 /* Forward declaration, a strange C thing */
174 /* Free all resources held by a thread. */
175 extern void release_thread(struct task_struct *);
177 /* Prepare to copy thread state - unlazy all lazy status */
178 #define prepare_to_copy(tsk) do { } while (0)
181 * create a kernel thread without removing it from tasklists
183 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
185 /* Copy and release all segment info associated with a VM */
186 #define copy_segments(p, mm) do { } while(0)
187 #define release_segments(mm) do { } while(0)
190 * FPU lazy state save handling.
193 static __inline__ void disable_fpu(void)
195 unsigned long __dummy;
197 /* Set FD flag in SR */
198 __asm__ __volatile__("stc sr, %0\n\t"
205 static __inline__ void enable_fpu(void)
207 unsigned long __dummy;
209 /* Clear out FD flag in SR */
210 __asm__ __volatile__("stc sr, %0\n\t"
217 static __inline__ void release_fpu(struct pt_regs *regs)
222 static __inline__ void grab_fpu(struct pt_regs *regs)
227 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
229 #define unlazy_fpu(tsk, regs) do { \
230 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
231 save_fpu(tsk, regs); \
235 #define clear_fpu(tsk, regs) do { \
236 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
237 clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
242 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
243 #define FPSCR_INIT 0x00080000
245 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
246 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
249 * Return saved PC of a blocked thread.
251 #define thread_saved_pc(tsk) (tsk->thread.pc)
253 void show_trace(struct task_struct *tsk, unsigned long *sp,
254 struct pt_regs *regs);
255 extern unsigned long get_wchan(struct task_struct *p);
257 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
258 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
260 #define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
261 #define cpu_relax() barrier()
263 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
264 defined(CONFIG_CPU_SH4)
265 #define PREFETCH_STRIDE L1_CACHE_BYTES
266 #define ARCH_HAS_PREFETCH
267 #define ARCH_HAS_PREFETCHW
268 static inline void prefetch(void *x)
270 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
273 #define prefetchw(x) prefetch(x)
276 #ifdef CONFIG_VSYSCALL
277 extern int vsyscall_init(void);
279 #define vsyscall_init() do { } while (0)
282 /* arch/sh/kernel/setup.c */
283 const char *get_cpu_subtype(struct sh_cpuinfo *c);
285 #endif /* __KERNEL__ */
286 #endif /* __ASM_SH_PROCESSOR_H */