/* * 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/cpumask.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#define STACK_TOP	TASK_SIZE /* * This decides where the kernel will search for a free chunk of vm * space during mmap's. */#define TASK_UNMAPPED_BASE	((TASK_SIZE / 3) & ~(PAGE_SIZE))#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#define STACK_TOP	\      (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE) /* * This decides where the kernel will search for a free chunk of vm * space during mmap's. */#define TASK_UNMAPPED_BASE						\	(test_thread_flag(TIF_32BIT_ADDR) ?				\		PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))#define TASK_SIZE_OF(tsk)						\	(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)#endif #ifdef __KERNEL__#define STACK_TOP_MAX	TASK_SIZE#endif #define NUM_FPU_REGS	32 typedef __u64 fpureg_t; /* * 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_struct {	fpureg_t	fpr[NUM_FPU_REGS];	unsigned int	fcr31;}; #define NUM_DSP_REGS   6 typedef __u32 dspreg_t; struct mips_dsp_state {	dspreg_t        dspr[NUM_DSP_REGS];	unsigned int    dspcontrol;}; #define INIT_CPUMASK { \	{0,} \} typedef struct {	unsigned long seg;} mm_segment_t; #define ARCH_MIN_TASKALIGN	8 struct mips_abi; /* * 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. */	struct mips_fpu_struct fpu;#ifdef CONFIG_MIPS_MT_FPAFF	/* Emulated instruction count */	unsigned long emulated_fp;	/* Saved per-thread scheduler affinity mask */	cpumask_t user_cpus_allowed;#endif /* CONFIG_MIPS_MT_FPAFF */ 	/* Saved state of the DSP ASE, if available. */	struct mips_dsp_state dsp; 	/* 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;	unsigned long irix_trampoline;  /* Wheee... */	unsigned long irix_oldctx;	struct mips_abi *abi;}; #ifdef CONFIG_MIPS_MT_FPAFF#define FPAFF_INIT						\	.emulated_fp			= 0,			\	.user_cpus_allowed		= INIT_CPUMASK,#else#define FPAFF_INIT#endif /* CONFIG_MIPS_MT_FPAFF */ #define INIT_THREAD  {						\        /*							\         * Saved main processor registers			\         */							\	.reg16			= 0,				\	.reg17			= 0,				\	.reg18			= 0,				\	.reg19			= 0,				\	.reg20			= 0,				\	.reg21			= 0,				\	.reg22			= 0,				\	.reg23			= 0,				\	.reg29			= 0,				\	.reg30			= 0,				\	.reg31			= 0,				\	/*							\	 * Saved cp0 stuff					\	 */							\	.cp0_status		= 0,				\	/*							\	 * Saved FPU/FPU emulator stuff				\	 */							\	.fpu			= {				\		.fpr		= {0,},				\		.fcr31		= 0,				\	},							\	/*							\	 * FPU affinity state (null if not FPAFF)		\	 */							\	FPAFF_INIT						\	/*							\	 * Saved DSP stuff					\	 */							\	.dsp			= {				\		.dspr		= {0, },			\		.dspcontrol	= 0,				\	},							\	/*							\	 * Other stuff associated with the process		\	 */							\	.cp0_badvaddr		= 0,				\	.cp0_baduaddr		= 0,				\	.error_code		= 0,				\	.trap_no		= 0,				\	.irix_trampoline	= 0,				\	.irix_oldctx		= 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 __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32)#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1)#define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->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 static 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 */