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
13 #include <asm/types.h>
14 #include <asm/cache.h>
15 #include <asm/ptrace.h>
18 * Default implementation of macro that returns current
19 * instruction pointer ("program counter").
21 #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n1:":"=z" (pc)); pc; })
23 /* Core Processor Version Register */
24 #define CCN_PVR 0xff000030
25 #define CCN_CVR 0xff000040
26 #define CCN_PRR 0xff000044
29 * CPU type and hardware bug flags. Kept separately for each CPU.
31 * Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
32 * in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c
33 * for parsing the subtype in get_cpu_subtype().
40 CPU_SH7705, CPU_SH7707, CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
41 CPU_SH7709, CPU_SH7709A, CPU_SH7729, CPU_SH7300,
44 CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
45 CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
46 CPU_SH73180, CPU_SH7770, CPU_SH7780, CPU_SH7781,
54 unsigned long loops_per_jiffy;
56 struct cache_info icache;
57 struct cache_info dcache;
62 extern struct sh_cpuinfo boot_cpu_data;
65 extern struct sh_cpuinfo cpu_data[];
66 #define current_cpu_data cpu_data[smp_processor_id()]
68 #define cpu_data (&boot_cpu_data)
69 #define current_cpu_data boot_cpu_data
73 * User space process size: 2GB.
75 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
77 #define TASK_SIZE 0x7c000000UL
79 /* This decides where the kernel will search for a free chunk of vm
80 * space during mmap's.
82 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
88 * When it's set, it means the processor doesn't have right to use FPU,
89 * and it results exception when the floating operation is executed.
92 * Interrupt level mask
94 #define SR_FD 0x00008000
95 #define SR_DSP 0x00001000
96 #define SR_IMASK 0x000000f0
99 * FPU structure and data
102 struct sh_fpu_hard_struct {
103 unsigned long fp_regs[16];
104 unsigned long xfp_regs[16];
108 long status; /* software status information */
111 /* Dummy fpu emulator */
112 struct sh_fpu_soft_struct {
113 unsigned long fp_regs[16];
114 unsigned long xfp_regs[16];
118 unsigned char lookahead;
119 unsigned long entry_pc;
123 struct sh_fpu_hard_struct hard;
124 struct sh_fpu_soft_struct soft;
131 #define CPU_HAS_FPU 0x0001 /* Hardware FPU support */
132 #define CPU_HAS_P2_FLUSH_BUG 0x0002 /* Need to flush the cache in P2 area */
133 #define CPU_HAS_MMU_PAGE_ASSOC 0x0004 /* SH3: TLB way selection bit support */
134 #define CPU_HAS_DSP 0x0008 /* SH-DSP: DSP support */
135 #define CPU_HAS_PERF_COUNTER 0x0010 /* Hardware performance counters */
136 #define CPU_HAS_PTEA 0x0020 /* PTEA register */
138 struct thread_struct {
142 unsigned long trap_no, error_code;
143 unsigned long address;
144 /* Hardware debugging registers may come here */
145 unsigned long ubc_pc;
147 /* floating point info */
148 union sh_fpu_union fpu;
151 /* Count of active tasks with UBC settings */
152 extern int ubc_usercnt;
154 #define INIT_THREAD { \
155 sizeof(init_stack) + (long) &init_stack, /* sp */ \
160 {{{0,}},} /* fpu state */ \
164 * Do necessary setup to start up a newly executed thread.
166 #define start_thread(regs, new_pc, new_sp) \
169 regs->sr = SR_FD; /* User mode. */ \
171 regs->regs[15] = new_sp
173 /* Forward declaration, a strange C thing */
177 /* Free all resources held by a thread. */
178 extern void release_thread(struct task_struct *);
180 /* Prepare to copy thread state - unlazy all lazy status */
181 #define prepare_to_copy(tsk) do { } while (0)
184 * create a kernel thread without removing it from tasklists
186 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
188 /* Copy and release all segment info associated with a VM */
189 #define copy_segments(p, mm) do { } while(0)
190 #define release_segments(mm) do { } while(0)
193 * FPU lazy state save handling.
196 static __inline__ void disable_fpu(void)
198 unsigned long __dummy;
200 /* Set FD flag in SR */
201 __asm__ __volatile__("stc sr, %0\n\t"
208 static __inline__ void enable_fpu(void)
210 unsigned long __dummy;
212 /* Clear out FD flag in SR */
213 __asm__ __volatile__("stc sr, %0\n\t"
220 static __inline__ void release_fpu(struct pt_regs *regs)
225 static __inline__ void grab_fpu(struct pt_regs *regs)
230 #ifdef CONFIG_CPU_SH4
231 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
233 #define save_fpu(tsk) do { } while (0)
236 #define unlazy_fpu(tsk, regs) do { \
237 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
238 save_fpu(tsk, regs); \
242 #define clear_fpu(tsk, regs) do { \
243 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
244 clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
249 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */
250 #define FPSCR_INIT 0x00080000
252 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
253 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
256 * Return saved PC of a blocked thread.
258 #define thread_saved_pc(tsk) (tsk->thread.pc)
260 extern unsigned long get_wchan(struct task_struct *p);
262 #define KSTK_EIP(tsk) ((tsk)->thread.pc)
263 #define KSTK_ESP(tsk) ((tsk)->thread.sp)
265 #define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
266 #define cpu_relax() do { } while (0)
268 #endif /* __KERNEL__ */
269 #endif /* __ASM_SH_PROCESSOR_H */