/* * 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. * * Copyright (C) 1994 Waldorf GMBH * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle * Copyright (C) 1996 Paul M. Antoine * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */#ifndef _ASM_PROCESSOR_H#define _ASM_PROCESSOR_H #include <linux/config.h>#include <linux/threads.h> #include <asm/cachectl.h>#include <asm/cpu.h>#include <asm/cpu-info.h>#include <asm/mipsregs.h>#include <asm/prefetch.h>#include <asm/system.h> /* * Return current * instruction pointer ("program counter"). */#define current_text_addr() ({ __label__ _l; _l: &&_l;}) /* * System setup and hardware flags.. */extern void (*cpu_wait)(void); extern unsigned int vced_count, vcei_count; #ifdef CONFIG_32BIT/* * User space process size: 2GB. This is hardcoded into a few places, * so don't change it unless you know what you are doing. */#define TASK_SIZE	0x7fff8000UL /* * 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))#endif #ifdef CONFIG_64BIT/* * User space process size: 1TB. This is hardcoded into a few places, * so don't change it unless you know what you are doing.  TASK_SIZE * is limited to 1TB by the R4000 architecture; R10000 and better can * support 16TB; the architectural reserve for future expansion is * 8192EB ... */#define TASK_SIZE32	0x7fff8000UL#define TASK_SIZE	0x10000000000UL /* * This decides where the kernel will search for a free chunk of vm * space during mmap's. */#define TASK_UNMAPPED_BASE	((current->thread.mflags & MF_32BIT_ADDR) ? \	PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))#endif #define NUM_FPU_REGS	32 typedef __u64 fpureg_t; struct mips_fpu_hard_struct {	fpureg_t	fpr[NUM_FPU_REGS];	unsigned int	fcr31;}; /* * It would be nice to add some more fields for emulator statistics, but there * are a number of fixed offsets in offset.h and elsewhere that would have to * be recalculated by hand.  So the additional information will be private to * the FPU emulator for now.  See asm-mips/fpu_emulator.h. */ struct mips_fpu_soft_struct {	fpureg_t	fpr[NUM_FPU_REGS];	unsigned int	fcr31;}; union mips_fpu_union {        struct mips_fpu_hard_struct hard;        struct mips_fpu_soft_struct soft;}; #define INIT_FPU { \	{{0,},} \} typedef struct {	unsigned long seg;} mm_segment_t; #define ARCH_MIN_TASKALIGN	8 /* * If you change thread_struct remember to change the #defines below too! */struct thread_struct {	/* Saved main processor registers. */	unsigned long reg16;	unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;	unsigned long reg29, reg30, reg31; 	/* Saved cp0 stuff. */	unsigned long cp0_status; 	/* Saved fpu/fpu emulator stuff. */	union mips_fpu_union fpu; 	/* Other stuff associated with the thread. */	unsigned long cp0_badvaddr;	/* Last user fault */	unsigned long cp0_baduaddr;	/* Last kernel fault accessing USEG */	unsigned long error_code;	unsigned long trap_no;#define MF_FIXADE	1		/* Fix address errors in software */#define MF_LOGADE	2		/* Log address errors to syslog */#define MF_32BIT_REGS	4		/* also implies 16/32 fprs */#define MF_32BIT_ADDR	8		/* 32-bit address space (o32/n32) */	unsigned long mflags;	unsigned long irix_trampoline;  /* Wheee... */	unsigned long irix_oldctx;}; #define MF_ABI_MASK	(MF_32BIT_REGS | MF_32BIT_ADDR)#define MF_O32		(MF_32BIT_REGS | MF_32BIT_ADDR)#define MF_N32		MF_32BIT_ADDR#define MF_N64		0 #define INIT_THREAD  { \        /* \         * saved main processor registers \         */ \	0, 0, 0, 0, 0, 0, 0, 0, \	               0, 0, 0, \	/* \	 * saved cp0 stuff \	 */ \	0, \	/* \	 * saved fpu/fpu emulator stuff \	 */ \	INIT_FPU, \	/* \	 * Other stuff associated with the process \	 */ \	0, 0, 0, 0, \	/* \	 * For now the default is to fix address errors \	 */ \	MF_FIXADE, 0, 0 \} struct task_struct; /* Free all resources held by a thread. */#define release_thread(thread) do { } while(0) /* Prepare to copy thread state - unlazy all lazy status */#define prepare_to_copy(tsk)	do { } while (0) extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); extern unsigned long thread_saved_pc(struct task_struct *tsk); /* * Do necessary setup to start up a newly executed thread. */extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp); unsigned long get_wchan(struct task_struct *p); #define __PT_REG(reg) ((long)&((struct pt_regs *)0)->reg - sizeof(struct pt_regs))#define __KSTK_TOS(tsk) ((unsigned long)(tsk->thread_info) + THREAD_SIZE - 32)#define KSTK_EIP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_epc)))#define KSTK_ESP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(regs[29])))#define KSTK_STATUS(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_status))) #define cpu_relax()	barrier() /* * Return_address is a replacement for __builtin_return_address(count) * which on certain architectures cannot reasonably be implemented in GCC * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386). * Note that __builtin_return_address(x>=1) is forbidden because GCC * aborts compilation on some CPUs.  It's simply not possible to unwind * some CPU's stackframes. * * __builtin_return_address works only for non-leaf functions.  We avoid the * overhead of a function call by forcing the compiler to save the return * address register on the stack. */#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);}) #ifdef CONFIG_CPU_HAS_PREFETCH #define ARCH_HAS_PREFETCH extern inline void prefetch(const void *addr){	__asm__ __volatile__(	"	.set	mips4		\n"	"	pref	%0, (%1)	\n"	"	.set	mips0		\n"	:	: "i" (Pref_Load), "r" (addr));} #endif #endif /* _ASM_PROCESSOR_H */