/* * 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 #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; 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_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 #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 */