/* * 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 #include #include #include #include #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; }) static inline void get_cpu_id(struct cpuid *ptr) { asm volatile("stidp %0" : "=Q" (*ptr)); } extern void s390_adjust_jiffies(void); extern int get_cpu_capability(unsigned int *); /* * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit. */ #ifndef __s390x__ #define TASK_SIZE (1UL << 31) #define TASK_UNMAPPED_BASE (1UL << 30) #else /* __s390x__ */ #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit) #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \ (1UL << 30) : (1UL << 41)) #define TASK_SIZE TASK_SIZE_OF(current) #endif /* __s390x__ */ #ifdef __KERNEL__ #ifndef __s390x__ #define STACK_TOP (1UL << 31) #define STACK_TOP_MAX (1UL << 31) #else /* __s390x__ */ #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42)) #define STACK_TOP_MAX (1UL << 42) #endif /* __s390x__ */ #endif #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 */ mm_segment_t mm_segment; unsigned long prot_addr; /* address of protection-excep. */ unsigned int trap_no; unsigned long gmap_addr; /* address of last gmap fault. */ struct per_regs per_user; /* User specified PER registers */ struct per_event per_event; /* Cause of the last PER trap */ /* pfault_wait is used to block the process on a pfault event */ unsigned long pfault_wait; struct list_head list; }; typedef struct thread_struct thread_struct; /* * Stack layout of a C stack frame. */ #ifndef __PACK_STACK struct stack_frame { unsigned long back_chain; unsigned long empty1[5]; unsigned long gprs[10]; unsigned int empty2[8]; }; #else struct stack_frame { unsigned long empty1[5]; unsigned int empty2[8]; unsigned long gprs[10]; unsigned long back_chain; }; #endif #define ARCH_MIN_TASKALIGN 8 #define INIT_THREAD { \ .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ } /* * Do necessary setup to start up a new thread. */ #define start_thread(regs, new_psw, new_stackp) do { \ regs->psw.mask = psw_user_bits; \ regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ regs->gprs[15] = new_stackp; \ } while (0) #define start_thread31(regs, new_psw, new_stackp) do { \ regs->psw.mask = psw_user32_bits; \ regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ regs->gprs[15] = new_stackp; \ crst_table_downgrade(current->mm, 1UL << 31); \ } while (0) /* Forward declaration, a strange C thing */ struct task_struct; struct mm_struct; struct seq_file; /* 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); extern void show_code(struct pt_regs *regs); 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(); } static inline void psw_set_key(unsigned int key) { asm volatile("spka 0(%0)" : : "d" (key)); } /* * Set PSW to specified value. */ static inline void __load_psw(psw_t psw) { #ifndef __s390x__ asm volatile("lpsw %0" : : "Q" (psw) : "cc"); #else asm volatile("lpswe %0" : : "Q" (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,%O1+4(%R1)\n" " lpsw %1\n" "1:" : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); #else /* __s390x__ */ asm volatile( " larl %0,1f\n" " stg %0,%O1+8(%R1)\n" " lpswe %1\n" "1:" : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); #endif /* __s390x__ */ } /* * Rewind PSW instruction address by specified number of bytes. */ static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc) { #ifndef __s390x__ if (psw.addr & PSW_ADDR_AMODE) /* 31 bit mode */ return (psw.addr - ilc) | PSW_ADDR_AMODE; /* 24 bit mode */ return (psw.addr - ilc) & ((1UL << 24) - 1); #else unsigned long mask; mask = (psw.mask & PSW_MASK_EA) ? -1UL : (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 : (1UL << 24) - 1; return (psw.addr - ilc) & mask; #endif } /* * 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 ATTRIB_NORET 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", "1"); #endif /* __s390x__ */ while (1); } /* * 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); #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 */