/* * 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 Ralf Baechle * Copyright (C) 1996 Paul M. Antoine * Copyright (C) 1999 Silicon Graphics, Inc. */#ifndef _ASM_PROCESSOR_H#define _ASM_PROCESSOR_H#include <linux/config.h>#include <asm/isadep.h>/* * Default implementation of macro that returns current * instruction pointer ("program counter"). */#define current_text_addr() ({ __label__ _l; _l: &&_l;})#if !defined (_LANGUAGE_ASSEMBLY)#if 0#include <linux/threads.h>#endif#include <asm/cachectl.h>#include <asm/mipsregs.h>#include <asm/reg.h>#include <asm/system.h>struct mips_cpuinfo {	unsigned long udelay_val;	unsigned long *pgd_quick;	unsigned long *pte_quick;	unsigned long pgtable_cache_sz;};/* * System setup and hardware flags.. * XXX: Should go into mips_cpuinfo. */extern void (*cpu_wait)(void);	/* only available on R4[26]00 and R3081 */extern void r3081_wait(void);extern void r4k_wait(void);extern char cyclecounter_available;	/* only available from R4000 upwards. */extern struct mips_cpuinfo boot_cpu_data;extern unsigned int vced_count, vcei_count;#ifdef CONFIG_SMPextern struct mips_cpuinfo cpu_data[];#define current_cpu_data cpu_data[smp_processor_id()]#else#define cpu_data &boot_cpu_data#define current_cpu_data boot_cpu_data#endif/* * Bus types (default is ISA, but people can check others with these..) * MCA_bus hardcoded to 0 for now. * * This needs to be extended since MIPS systems are being delivered with * numerous different types of bus systems. */extern int EISA_bus;#define MCA_bus 0#define MCA_bus__is_a_macro /* for versions in ksyms.c *//* * MIPS has no problems with write protection */#define wp_works_ok 1#define wp_works_ok__is_a_macro /* for versions in ksyms.c *//* Lazy FPU handling on uni-processor */extern struct task_struct *last_task_used_math;/* * User space process size: 2GB. This is hardcoded into a few places, * so don't change it unless you know what you are doing.  TASK_SIZE * for a 64 bit kernel expandable to 8192EB, of which the current MIPS * implementations will "only" be able to use 1TB ... */#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	(TASK_SIZE / 3)/* * Size of io_bitmap in longwords: 32 is ports 0-0x3ff. */#define IO_BITMAP_SIZE	32#define NUM_FPU_REGS	32struct mips_fpu_hard_struct {	double fp_regs[NUM_FPU_REGS];	unsigned int control;};/* * 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. */typedef u64 fpureg_t;struct mips_fpu_soft_struct {	fpureg_t	regs[NUM_FPU_REGS];	unsigned int	sr;};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;/* * 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 */	unsigned long mflags;	mm_segment_t current_ds;	unsigned long irix_trampoline;  /* Wheee... */	unsigned long irix_oldctx;	/*	 * These are really only needed if the full FPU emulator is configured.	 * Would be made conditional on MIPS_FPU_EMULATOR if it weren't for the	 * fact that having offset.h rebuilt differently for different config	 * options would be asking for trouble.	 *	 * Saved EPC during delay-slot emulation (see math-emu/cp1emu.c)	 */	unsigned long dsemul_epc;	/*	 * Pointer to instruction used to induce address error	 */	unsigned long dsemul_aerpc;};#endif /* !defined (_LANGUAGE_ASSEMBLY) */#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, 0, \	/* \	 * dsemul_epc and dsemul_aerpc should never be used uninitialized, \	 * but... \	 */ \	0 ,0 \}#ifdef __KERNEL__#define KERNEL_STACK_SIZE 8192#if !defined (_LANGUAGE_ASSEMBLY)/* Free all resources held by a thread. */#define release_thread(thread) do { } while(0)extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);/* 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)/* * Return saved PC of a blocked thread. */extern inline unsigned long thread_saved_pc(struct thread_struct *t){	extern void ret_from_fork(void);	/* New born processes are a special case */	if (t->reg31 == (unsigned long) ret_from_fork)		return t->reg31;	return ((unsigned long *)t->reg29)[10];}/* * Do necessary setup to start up a newly executed thread. */#define start_thread(regs, new_pc, new_sp) do {				\	/* New thread looses kernel privileges. */			\	regs->cp0_status = (regs->cp0_status & ~(ST0_CU0|ST0_KSU)) | KU_USER;\	regs->cp0_epc = new_pc;						\	regs->regs[29] = new_sp;					\	current->thread.current_ds = USER_DS;				\} while (0)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) + KERNEL_STACK_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])))/* Allocation and freeing of basic task resources. *//* * NOTE! The task struct and the stack go together */#define THREAD_SIZE (2*PAGE_SIZE)#define alloc_task_struct() \	((struct task_struct *) __get_free_pages(GFP_KERNEL,1))#define free_task_struct(p)	free_pages((unsigned long)(p),1)#define get_task_struct(tsk)      atomic_inc(&virt_to_page(tsk)->count)#define init_task	(init_task_union.task)#define init_stack	(init_task_union.stack)#define cpu_relax()	do { } while (0)#endif /* !defined (_LANGUAGE_ASSEMBLY) */#endif /* __KERNEL__ *//* * 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);})#endif /* _ASM_PROCESSOR_H */