/* * 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> /* * Return current * instruction pointer ("program counter"). */#define current_text_addr() ({ __label__ _l; _l: &&_l;}) /* * System setup and hardware flags.. */ extern unsigned int vced_count, vcei_count; /* * MIPS does have an arch_pick_mmap_layout() */#define HAVE_ARCH_PICK_MMAP_LAYOUT 1 /* * A special page (the vdso) is mapped into all processes at the very * top of the virtual memory space. */#define SPECIAL_PAGES_SIZE PAGE_SIZE #ifdef CONFIG_32BIT#ifdef CONFIG_KVM_GUEST/* User space process size is limited to 1GB in KVM Guest Mode */#define TASK_SIZE	0x3fff8000UL#else/* * 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#endif #ifdef __KERNEL__#define STACK_TOP_MAX	TASK_SIZE#endif #define TASK_IS_32BIT_ADDR 1 #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_SIZE64	0x10000000000UL#define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64) #ifdef __KERNEL__#define STACK_TOP_MAX	TASK_SIZE64#endif  #define TASK_SIZE_OF(tsk)						\	(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64) #define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR) #endif #define STACK_TOP	((TASK_SIZE & PAGE_MASK) - SPECIAL_PAGES_SIZE) /* * 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)  #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,} \} struct mips3264_watch_reg_state {	/* The width of watchlo is 32 in a 32 bit kernel and 64 in a	   64 bit kernel.  We use unsigned long as it has the same	   property. */	unsigned long watchlo[NUM_WATCH_REGS];	/* Only the mask and IRW bits from watchhi. */	u16 watchhi[NUM_WATCH_REGS];}; union mips_watch_reg_state {	struct mips3264_watch_reg_state mips3264;}; #if defined(CONFIG_CPU_CAVIUM_OCTEON) struct octeon_cop2_state {	/* DMFC2 rt, 0x0201 */	unsigned long	cop2_crc_iv;	/* DMFC2 rt, 0x0202 (Set with DMTC2 rt, 0x1202) */	unsigned long	cop2_crc_length;	/* DMFC2 rt, 0x0200 (set with DMTC2 rt, 0x4200) */	unsigned long	cop2_crc_poly;	/* DMFC2 rt, 0x0402; DMFC2 rt, 0x040A */	unsigned long	cop2_llm_dat[2];       /* DMFC2 rt, 0x0084 */	unsigned long	cop2_3des_iv;	/* DMFC2 rt, 0x0080; DMFC2 rt, 0x0081; DMFC2 rt, 0x0082 */	unsigned long	cop2_3des_key[3];	/* DMFC2 rt, 0x0088 (Set with DMTC2 rt, 0x0098) */	unsigned long	cop2_3des_result;	/* DMFC2 rt, 0x0111 (FIXME: Read Pass1 Errata) */	unsigned long	cop2_aes_inp0;	/* DMFC2 rt, 0x0102; DMFC2 rt, 0x0103 */	unsigned long	cop2_aes_iv[2];	/* DMFC2 rt, 0x0104; DMFC2 rt, 0x0105; DMFC2 rt, 0x0106; DMFC2	 * rt, 0x0107 */	unsigned long	cop2_aes_key[4];	/* DMFC2 rt, 0x0110 */	unsigned long	cop2_aes_keylen;	/* DMFC2 rt, 0x0100; DMFC2 rt, 0x0101 */	unsigned long	cop2_aes_result[2];	/* DMFC2 rt, 0x0240; DMFC2 rt, 0x0241; DMFC2 rt, 0x0242; DMFC2	 * rt, 0x0243; DMFC2 rt, 0x0244; DMFC2 rt, 0x0245; DMFC2 rt,	 * 0x0246; DMFC2 rt, 0x0247; DMFC2 rt, 0x0248; DMFC2 rt,	 * 0x0249; DMFC2 rt, 0x024A; DMFC2 rt, 0x024B; DMFC2 rt,	 * 0x024C; DMFC2 rt, 0x024D; DMFC2 rt, 0x024E - Pass2 */	unsigned long	cop2_hsh_datw[15];	/* DMFC2 rt, 0x0250; DMFC2 rt, 0x0251; DMFC2 rt, 0x0252; DMFC2	 * rt, 0x0253; DMFC2 rt, 0x0254; DMFC2 rt, 0x0255; DMFC2 rt,	 * 0x0256; DMFC2 rt, 0x0257 - Pass2 */	unsigned long	cop2_hsh_ivw[8];	/* DMFC2 rt, 0x0258; DMFC2 rt, 0x0259 - Pass2 */	unsigned long	cop2_gfm_mult[2];	/* DMFC2 rt, 0x025E - Pass2 */	unsigned long	cop2_gfm_poly;	/* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */	unsigned long	cop2_gfm_result[2];};#define COP2_INIT						\	.cp2			= {0,}, struct octeon_cvmseg_state {	unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE]			    [cpu_dcache_line_size() / sizeof(unsigned long)];}; #elif defined(CONFIG_CPU_XLP)struct nlm_cop2_state {	u64	rx[4];	u64	tx[4];	u32	tx_msg_status;	u32	rx_msg_status;}; #define COP2_INIT						\	.cp2			= {{0}, {0}, 0, 0},#else#define COP2_INIT#endif 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; 	/* Saved watch register state, if available. */	union mips_watch_reg_state watch; 	/* 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;#ifdef CONFIG_CPU_CAVIUM_OCTEON	struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));	struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));#endif#ifdef CONFIG_CPU_XLP	struct nlm_cop2_state cp2;#endif	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,				\	},							\	/*							\	 * saved watch register stuff				\	 */							\	.watch = {{{0,},},},					\	/*							\	 * Other stuff associated with the process		\	 */							\	.cp0_badvaddr		= 0,				\	.cp0_baduaddr		= 0,				\	.error_code		= 0,				\	/*							\	 * Platform specific cop2 registers(null if no COP2)	\	 */							\	COP2_INIT						\} struct task_struct; /* Free all resources held by a thread. */#define release_thread(thread) do { } while(0) 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 - sizeof(struct pt_regs))#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))#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 unusable 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#define prefetch(x) __builtin_prefetch((x), 0, 1) #define ARCH_HAS_PREFETCHW#define prefetchw(x) __builtin_prefetch((x), 1, 1) /* * See Documentation/scheduler/sched-arch.txt; prevents deadlock on SMP * systems. */#define __ARCH_WANT_UNLOCKED_CTXSW #endif #endif /* _ASM_PROCESSOR_H */