/* *  include/asm-s390/processor.h * *  S390 version *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation *    Author(s): Hartmut Penner (hp@de.ibm.com), *               Martin Schwidefsky (schwidefsky@de.ibm.com) * *  Derived from "include/asm-i386/processor.h" *    Copyright (C) 1994, Linus Torvalds */ #ifndef __ASM_S390_PROCESSOR_H#define __ASM_S390_PROCESSOR_H #include <asm/ptrace.h> #ifdef __KERNEL__/* * Default implementation of macro that returns current * instruction pointer ("program counter"). */#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; }) /* *  CPU type and hardware bug flags. Kept separately for each CPU. *  Members of this structure are referenced in head.S, so think twice *  before touching them. [mj] */ typedef struct{        unsigned int version :  8;        unsigned int ident   : 24;        unsigned int machine : 16;        unsigned int unused  : 16;} __attribute__ ((packed)) cpuid_t; static inline void get_cpu_id(cpuid_t *ptr){	asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));} struct cpuinfo_S390{        cpuid_t  cpu_id;        __u16    cpu_addr;        __u16    cpu_nr;        unsigned long loops_per_jiffy;        unsigned long *pgd_quick;#ifdef __s390x__        unsigned long *pmd_quick;#endif /* __s390x__ */        unsigned long *pte_quick;        unsigned long pgtable_cache_sz;}; extern void s390_adjust_jiffies(void);extern void print_cpu_info(struct cpuinfo_S390 *); /* Lazy FPU handling on uni-processor */extern struct task_struct *last_task_used_math; /* * User space process size: 2GB for 31 bit, 4TB for 64 bit. */#ifndef __s390x__ # define TASK_SIZE		(0x80000000UL)# define TASK_UNMAPPED_BASE	(TASK_SIZE / 2)# define DEFAULT_TASK_SIZE	(0x80000000UL) #else /* __s390x__ */ # define TASK_SIZE		(test_thread_flag(TIF_31BIT) ? \					(0x80000000UL) : (0x40000000000UL))# define TASK_UNMAPPED_BASE	(TASK_SIZE / 2)# define DEFAULT_TASK_SIZE	(0x40000000000UL) #endif /* __s390x__ */ #define HAVE_ARCH_PICK_MMAP_LAYOUT typedef struct {        __u32 ar4;} mm_segment_t; /* * Thread structure */struct thread_struct {	s390_fp_regs fp_regs;	unsigned int  acrs[NUM_ACRS];        unsigned long ksp;              /* kernel stack pointer             */        unsigned long user_seg;         /* HSTD                             */	mm_segment_t mm_segment;        unsigned long prot_addr;        /* address of protection-excep.     */        unsigned int error_code;        /* error-code of last prog-excep.   */        unsigned int trap_no;        per_struct per_info;	/* Used to give failing instruction back to user for ieee exceptions */	unsigned long ieee_instruction_pointer;         /* pfault_wait is used to block the process on a pfault event */	unsigned long pfault_wait;}; typedef struct thread_struct thread_struct; /* * Stack layout of a C stack frame. */#ifndef __PACK_STACKstruct stack_frame {	unsigned long back_chain;	unsigned long empty1[5];	unsigned long gprs[10];	unsigned int  empty2[8];};#elsestruct stack_frame {	unsigned long empty1[5];	unsigned int  empty2[8];	unsigned long gprs[10];	unsigned long back_chain;};#endif #define ARCH_MIN_TASKALIGN	8 #ifndef __s390x__# define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _SEGMENT_TABLE#else /* __s390x__ */# define __SWAPPER_PG_DIR __pa(&swapper_pg_dir[0]) + _REGION_TABLE#endif /* __s390x__ */ #define INIT_THREAD {{0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0},	       \			    {0},{0},{0},{0},{0},{0}}},			       \		     {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},	       \		     sizeof(init_stack) + (unsigned long) &init_stack,	       \		     __SWAPPER_PG_DIR,					       \		     {0},						       \		     0,0,0,						       \		     (per_struct) {{{{0,}}},0,0,0,0,{{0,}}},		       \		     0, 0						       \}  /* * Do necessary setup to start up a new thread. */#ifndef __s390x__ #define start_thread(regs, new_psw, new_stackp) do {            \	set_fs(USER_DS);					\	regs->psw.mask	= psw_user_bits;			\        regs->psw.addr  = new_psw | PSW_ADDR_AMODE;             \        regs->gprs[15]  = new_stackp ;                          \} while (0) #else /* __s390x__ */ #define start_thread(regs, new_psw, new_stackp) do {            \	set_fs(USER_DS);					\	regs->psw.mask	= psw_user_bits;			\        regs->psw.addr  = new_psw;                              \        regs->gprs[15]  = new_stackp;                           \} while (0) #define start_thread31(regs, new_psw, new_stackp) do {          \	set_fs(USER_DS);					\	regs->psw.mask	= psw_user32_bits;			\        regs->psw.addr  = new_psw;                              \        regs->gprs[15]  = new_stackp;                           \} while (0) #endif /* __s390x__ */ /* 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 *);extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); /* Prepare to copy thread state - unlazy all lazy status */#define prepare_to_copy(tsk)	do { } while (0) /* * Return saved PC of a blocked thread. */extern unsigned long thread_saved_pc(struct task_struct *t); /* * Print register of task into buffer. Used in fs/proc/array.c. */extern char *task_show_regs(struct task_struct *task, char *buffer); extern void show_registers(struct pt_regs *regs);extern void show_trace(struct task_struct *task, unsigned long *sp); unsigned long get_wchan(struct task_struct *p);#define task_pt_regs(tsk) ((struct pt_regs *) \        (task_stack_page(tsk) + THREAD_SIZE) - 1)#define KSTK_EIP(tsk)	(task_pt_regs(tsk)->psw.addr)#define KSTK_ESP(tsk)	(task_pt_regs(tsk)->gprs[15]) /* * Give up the time slice of the virtual PU. */static inline void cpu_relax(void){	if (MACHINE_HAS_DIAG44)		asm volatile("diag 0,0,68");	barrier();} /* * Set PSW to specified value. */static inline void __load_psw(psw_t psw){#ifndef __s390x__	asm volatile("lpsw  0(%0)" : : "a" (&psw), "m" (psw) : "cc");#else	asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc");#endif} /* * Set PSW mask to specified value, while leaving the * PSW addr pointing to the next instruction. */ static inline void __load_psw_mask (unsigned long mask){	unsigned long addr;	psw_t psw; 	psw.mask = mask; #ifndef __s390x__	asm volatile(		"	basr	%0,0\n"		"0:	ahi	%0,1f-0b\n"		"	st	%0,4(%1)\n"		"	lpsw	0(%1)\n"		"1:"		: "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");#else /* __s390x__ */	asm volatile(		"	larl	%0,1f\n"		"	stg	%0,8(%1)\n"		"	lpswe	0(%1)\n"		"1:"		: "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");#endif /* __s390x__ */} /* * Function to stop a processor until an interruption occurred */static inline void enabled_wait(void){	__load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |			PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);} /* * Function to drop a processor into disabled wait state */ static inline void disabled_wait(unsigned long code){        unsigned long ctl_buf;        psw_t dw_psw;         dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;        dw_psw.addr = code;        /*          * Store status and then load disabled wait psw,         * the processor is dead afterwards         */#ifndef __s390x__	asm volatile(		"	stctl	0,0,0(%2)\n"		"	ni	0(%2),0xef\n"	/* switch off protection */		"	lctl	0,0,0(%2)\n"		"	stpt	0xd8\n"		/* store timer */		"	stckc	0xe0\n"		/* store clock comparator */		"	stpx	0x108\n"	/* store prefix register */		"	stam	0,15,0x120\n"	/* store access registers */		"	std	0,0x160\n"	/* store f0 */		"	std	2,0x168\n"	/* store f2 */		"	std	4,0x170\n"	/* store f4 */		"	std	6,0x178\n"	/* store f6 */		"	stm	0,15,0x180\n"	/* store general registers */		"	stctl	0,15,0x1c0\n"	/* store control registers */		"	oi	0x1c0,0x10\n"	/* fake protection bit */		"	lpsw	0(%1)"		: "=m" (ctl_buf)		: "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc");#else /* __s390x__ */	asm volatile(		"	stctg	0,0,0(%2)\n"		"	ni	4(%2),0xef\n"	/* switch off protection */		"	lctlg	0,0,0(%2)\n"		"	lghi	1,0x1000\n"		"	stpt	0x328(1)\n"	/* store timer */		"	stckc	0x330(1)\n"	/* store clock comparator */		"	stpx	0x318(1)\n"	/* store prefix register */		"	stam	0,15,0x340(1)\n"/* store access registers */		"	stfpc	0x31c(1)\n"	/* store fpu control */		"	std	0,0x200(1)\n"	/* store f0 */		"	std	1,0x208(1)\n"	/* store f1 */		"	std	2,0x210(1)\n"	/* store f2 */		"	std	3,0x218(1)\n"	/* store f3 */		"	std	4,0x220(1)\n"	/* store f4 */		"	std	5,0x228(1)\n"	/* store f5 */		"	std	6,0x230(1)\n"	/* store f6 */		"	std	7,0x238(1)\n"	/* store f7 */		"	std	8,0x240(1)\n"	/* store f8 */		"	std	9,0x248(1)\n"	/* store f9 */		"	std	10,0x250(1)\n"	/* store f10 */		"	std	11,0x258(1)\n"	/* store f11 */		"	std	12,0x260(1)\n"	/* store f12 */		"	std	13,0x268(1)\n"	/* store f13 */		"	std	14,0x270(1)\n"	/* store f14 */		"	std	15,0x278(1)\n"	/* store f15 */		"	stmg	0,15,0x280(1)\n"/* store general registers */		"	stctg	0,15,0x380(1)\n"/* store control registers */		"	oi	0x384(1),0x10\n"/* fake protection bit */		"	lpswe	0(%1)"		: "=m" (ctl_buf)		: "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0");#endif /* __s390x__ */} /* * Basic Machine Check/Program Check Handler. */ extern void s390_base_mcck_handler(void);extern void s390_base_pgm_handler(void);extern void s390_base_ext_handler(void); extern void (*s390_base_mcck_handler_fn)(void);extern void (*s390_base_pgm_handler_fn)(void);extern void (*s390_base_ext_handler_fn)(void); /* * CPU idle notifier chain. */#define CPU_IDLE	0#define CPU_NOT_IDLE	1 struct notifier_block;int register_idle_notifier(struct notifier_block *nb);int unregister_idle_notifier(struct notifier_block *nb); #define ARCH_LOW_ADDRESS_LIMIT	0x7fffffffUL #endif /* * Helper macro for exception table entries */#ifndef __s390x__#define EX_TABLE(_fault,_target)			\	".section __ex_table,\"a\"\n"			\	"	.align 4\n"				\	"	.long  " #_fault "," #_target "\n"	\	".previous\n"#else#define EX_TABLE(_fault,_target)			\	".section __ex_table,\"a\"\n"			\	"	.align 8\n"				\	"	.quad  " #_fault "," #_target "\n"	\	".previous\n"#endif #endif                                 /* __ASM_S390_PROCESSOR_H           */