/*
* include/asm-sh/processor.h
*
* Copyright (C) 1999, 2000 Niibe Yutaka
* Copyright (C) 2002, 2003 Paul Mundt
*/

#ifndef __ASM_SH_PROCESSOR_32_H
#define __ASM_SH_PROCESSOR_32_H
#ifdef __KERNEL__

#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/page.h>
#include <asm/types.h>
#include <asm/hw_breakpoint.h>

/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n.align 2\n1:":"=z" (pc)); pc; })

/* Core Processor Version Register */
#define CCN_PVR 0xff000030
#define CCN_CVR 0xff000040
#define CCN_PRR 0xff000044

/*
* User space process size: 2GB.
*
* Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
*/
#define TASK_SIZE 0x7c000000UL

#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX STACK_TOP

/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)

/*
* Bit of SR register
*
* FD-bit:
* When it's set, it means the processor doesn't have right to use FPU,
* and it results exception when the floating operation is executed.
*
* IMASK-bit:
* Interrupt level mask
*/
#define SR_DSP 0x00001000
#define SR_IMASK 0x000000f0
#define SR_FD 0x00008000
#define SR_MD 0x40000000

/*
* DSP structure and data
*/
struct sh_dsp_struct {
unsigned long dsp_regs[14];
long status;
};

/*
* FPU structure and data
*/

struct sh_fpu_hard_struct {
unsigned long fp_regs[16];
unsigned long xfp_regs[16];
unsigned long fpscr;
unsigned long fpul;

long status; /* software status information */
};

/* Dummy fpu emulator */
struct sh_fpu_soft_struct {
unsigned long fp_regs[16];
unsigned long xfp_regs[16];
unsigned long fpscr;
unsigned long fpul;

unsigned char lookahead;
unsigned long entry_pc;
};

union thread_xstate {
struct sh_fpu_hard_struct hardfpu;
struct sh_fpu_soft_struct softfpu;
};

struct thread_struct {
/* Saved registers when thread is descheduled */
unsigned long sp;
unsigned long pc;

/* Various thread flags, see SH_THREAD_xxx */
unsigned long flags;

/* Save middle states of ptrace breakpoints */
struct perf_event *ptrace_bps[HBP_NUM];

#ifdef CONFIG_SH_DSP
/* Dsp status information */
struct sh_dsp_struct dsp_status;
#endif

/* Extended processor state */
union thread_xstate *xstate;

/*
* fpu_counter contains the number of consecutive context switches
* that the FPU is used. If this is over a threshold, the lazy fpu
* saving becomes unlazy to save the trap. This is an unsigned char
* so that after 256 times the counter wraps and the behavior turns
* lazy again; this to deal with bursty apps that only use FPU for
* a short time
*/
unsigned char fpu_counter;
};

#define INIT_THREAD { \
.sp = sizeof(init_stack) + (long) &init_stack, \
.flags = 0, \
}

/* Forward declaration, a strange C thing */
struct task_struct;

extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

/* Copy and release all segment info associated with a VM */
#define copy_segments(p, mm) do { } while(0)
#define release_segments(mm) do { } while(0)

/*
* FPU lazy state save handling.
*/

static __inline__ void disable_fpu(void)
{
unsigned long __dummy;

/* Set FD flag in SR */
__asm__ __volatile__("stc sr, %0\n\t"
"or %1, %0\n\t"
"ldc %0, sr"
: "=&r" (__dummy)
: "r" (SR_FD));
}

static __inline__ void enable_fpu(void)
{
unsigned long __dummy;

/* Clear out FD flag in SR */
__asm__ __volatile__("stc sr, %0\n\t"
"and %1, %0\n\t"
"ldc %0, sr"
: "=&r" (__dummy)
: "r" (~SR_FD));
}

/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
#define FPSCR_INIT 0x00080000

#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */

/*
* Return saved PC of a blocked thread.
*/
#define thread_saved_pc(tsk) (tsk->thread.pc)

void show_trace(struct task_struct *tsk, unsigned long *sp,
struct pt_regs *regs);

#ifdef CONFIG_DUMP_CODE
void show_code(struct pt_regs *regs);
#else
static inline void show_code(struct pt_regs *regs)
{
}
#endif

extern unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])

#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)

#define PREFETCH_STRIDE L1_CACHE_BYTES
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW

static inline void prefetch(const void *x)
{
__builtin_prefetch(x, 0, 3);
}

static inline void prefetchw(const void *x)
{
__builtin_prefetch(x, 1, 3);
}
#endif

#endif /* __KERNEL__ */
#endif /* __ASM_SH_PROCESSOR_32_H */