#ifndef __ASM_SH_PROCESSOR_64_H#define __ASM_SH_PROCESSOR_64_H /* * include/asm-sh/processor_64.h * * Copyright (C) 2000, 2001  Paolo Alberelli * Copyright (C) 2003  Paul Mundt * Copyright (C) 2004  Richard Curnow * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. */#ifndef __ASSEMBLY__ #include <linux/compiler.h>#include <asm/page.h>#include <asm/types.h>#include <cpu/registers.h> /* * Default implementation of macro that returns current * instruction pointer ("program counter"). */#define current_text_addr() ({ \void *pc; \unsigned long long __dummy = 0; \__asm__("gettr	tr0, %1\n\t" \	"pta	4, tr0\n\t" \	"gettr	tr0, %0\n\t" \	"ptabs	%1, tr0\n\t"	\	:"=r" (pc), "=r" (__dummy) \	: "1" (__dummy)); \pc; }) #endif /* * User space process size: 2GB - 4k. */#define TASK_SIZE	0x7ffff000UL #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 * * STEP-bit: *     Single step bit * */#if defined(CONFIG_SH64_SR_WATCH)#define SR_MMU   0x84000000#else#define SR_MMU   0x80000000#endif #define SR_IMASK 0x000000f0#define SR_FD    0x00008000#define SR_SSTEP 0x08000000 #ifndef __ASSEMBLY__ /* * FPU structure and data : require 8-byte alignment as we need to access it   with fld.p, fst.p */ struct sh_fpu_hard_struct {	unsigned long fp_regs[64];	unsigned int fpscr;	/* long status; * software status information */}; /* Dummy fpu emulator  */struct sh_fpu_soft_struct {	unsigned long fp_regs[64];	unsigned int fpscr;	unsigned char lookahead;	unsigned long entry_pc;}; union thread_xstate {	struct sh_fpu_hard_struct hardfpu;	struct sh_fpu_soft_struct softfpu;	/*	 * The structure definitions only produce 32 bit alignment, yet we need	 * to access them using 64 bit load/store as well.	 */	unsigned long long alignment_dummy;}; struct thread_struct {	unsigned long sp;	unsigned long pc; 	/* Various thread flags, see SH_THREAD_xxx */	unsigned long flags; 	/* This stores the address of the pt_regs built during a context	   switch, or of the register save area built for a kernel mode	   exception.  It is used for backtracing the stack of a sleeping task	   or one that traps in kernel mode. */        struct pt_regs *kregs;	/* This stores the address of the pt_regs constructed on entry from	   user mode.  It is a fixed value over the lifetime of a process, or	   NULL for a kernel thread. */	struct pt_regs *uregs; 	unsigned long address;	/* Hardware debugging registers may come here */ 	/* floating point info */	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_MMAP \{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL } #define INIT_THREAD  {				\	.sp		= sizeof(init_stack) +	\			  (long) &init_stack,	\	.pc		= 0,			\        .kregs		= &fake_swapper_regs,	\	.uregs	        = NULL,			\	.address	= 0,			\	.flags		= 0,			\} /* * Do necessary setup to start up a newly executed thread. */#define SR_USER (SR_MMU | SR_FD) #define start_thread(_regs, new_pc, new_sp)			\	_regs->sr = SR_USER;	/* User mode. */		\	_regs->pc = new_pc - 4;	/* Compensate syscall exit */	\	_regs->pc |= 1;		/* Set SHmedia ! */		\	_regs->regs[18] = 0;					\	_regs->regs[15] = new_sp /* Forward declaration, a strange C thing */struct task_struct;struct mm_struct; /* 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)#define forget_segments()	do { } while (0)/* * FPU lazy state save handling. */ static inline void disable_fpu(void){	unsigned long long __dummy; 	/* Set FD flag in SR */	__asm__ __volatile__("getcon	" __SR ", %0\n\t"			     "or	%0, %1, %0\n\t"			     "putcon	%0, " __SR "\n\t"			     : "=&r" (__dummy)			     : "r" (SR_FD));} static inline void enable_fpu(void){	unsigned long long __dummy; 	/* Clear out FD flag in SR */	__asm__ __volatile__("getcon	" __SR ", %0\n\t"			     "and	%0, %1, %0\n\t"			     "putcon	%0, " __SR "\n\t"			     : "=&r" (__dummy)			     : "r" (~SR_FD));} /* Round to nearest, no exceptions on inexact, overflow, underflow,   zero-divide, invalid.  Configure option for whether to flush denorms to   zero, or except if a denorm is encountered.  */#if defined(CONFIG_SH64_FPU_DENORM_FLUSH)#define FPSCR_INIT  0x00040000#else#define FPSCR_INIT  0x00000000#endif #ifdef CONFIG_SH_FPU/* Initialise the FP state of a task */void fpinit(struct sh_fpu_hard_struct *fpregs);#else#define fpinit(fpregs)	do { } while (0)#endif extern struct task_struct *last_task_used_math; /* * Return saved PC of a blocked thread. */#define thread_saved_pc(tsk)	(tsk->thread.pc) extern unsigned long get_wchan(struct task_struct *p); #define KSTK_EIP(tsk)  ((tsk)->thread.pc)#define KSTK_ESP(tsk)  ((tsk)->thread.sp) #endif	/* __ASSEMBLY__ */#endif /* __ASM_SH_PROCESSOR_64_H */