/* * 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 /* * 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; unsigned long *pte_quick; unsigned long pgtable_cache_sz; }; 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 (default). */ #define TASK_SIZE (0x80000000) /* This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE (TASK_SIZE / 2) #define THREAD_SIZE (2*PAGE_SIZE) typedef struct { unsigned long seg; unsigned long acc4; } mm_segment_t; /* if you change the thread_struct structure, you must * update the _TSS_* defines in entry.S */ struct thread_struct { struct pt_regs *regs; /* the user registers can be found on*/ s390_fp_regs fp_regs; __u32 ar2; /* kernel access register 2 */ __u32 ar4; /* kernel access register 4 */ __u32 ksp; /* kernel stack pointer */ __u32 user_seg; /* HSTD */ __u32 error_code; /* error-code of last prog-excep. */ __u32 prot_addr; /* address of protection-excep. */ __u32 trap_no; /* perform syscall argument validation (get/set_fs) */ mm_segment_t fs; per_struct per_info;/* Must be aligned on an 4 byte boundary*/ /* Used to give failing instruction back to user for ieee exceptions */ addr_t ieee_instruction_pointer; /* pfault_wait is used to block the process on a pfault event */ addr_t pfault_wait; }; typedef struct thread_struct thread_struct; #define INIT_THREAD { (struct pt_regs *) 0, \ { 0,{{0},{0},{0},{0},{0},{0},{0},{0},{0},{0}, \ {0},{0},{0},{0},{0},{0}}}, \ 0, 0, \ sizeof(init_stack) + (__u32) &init_stack, \ (__pa((__u32) &swapper_pg_dir[0]) + _SEGMENT_TABLE),\ 0,0,0, \ (mm_segment_t) { 0,1}, \ (per_struct) {{{{0,}}},0,0,0,0,{{0,}}}, \ 0, 0 \ } /* need to define ... */ #define start_thread(regs, new_psw, new_stackp) do { \ regs->psw.mask = _USER_PSW_MASK; \ regs->psw.addr = new_psw | 0x80000000; \ regs->gprs[15] = new_stackp ; \ } while (0) /* Forward declaration, a strange C thing */ 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); /* Copy and release all segment info associated with a VM */ #define copy_segments(nr, mm) do { } while (0) #define release_segments(mm) do { } while (0) /* * Return saved PC of a blocked thread. used in kernel/sched */ extern inline unsigned long thread_saved_pc(struct thread_struct *t) { return (t->regs) ? ((unsigned long)t->regs->psw.addr) : 0; } unsigned long get_wchan(struct task_struct *p); #define KSTK_EIP(tsk) ((tsk)->thread.regs->psw.addr) #define KSTK_ESP(tsk) ((tsk)->thread.ksp) /* Allocation and freeing of basic task resources. */ /* * NOTE! The task struct and the stack go together */ #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) /* * Set of msr bits that gdb can change on behalf of a process. */ /* Only let our hackers near the condition codes */ #define PSW_MASK_DEBUGCHANGE 0x00003000UL /* Don't let em near the addressing mode either */ #define PSW_ADDR_DEBUGCHANGE 0x7FFFFFFFUL #define PSW_ADDR_MASK 0x7FFFFFFFUL /* Program event recording mask */ #define PSW_PER_MASK 0x40000000UL #define USER_STD_MASK 0x00000080UL #define PSW_PROBLEM_STATE 0x00010000UL /* * Function to drop a processor into disabled wait state */ static inline void disabled_wait(unsigned long code) { char psw_buffer[2*sizeof(psw_t)]; char ctl_buf[4]; psw_t *dw_psw = (psw_t *)(((unsigned long) &psw_buffer+sizeof(psw_t)-1) & -sizeof(psw_t)); dw_psw->mask = 0x000a0000; dw_psw->addr = code; /* * Store status and then load disabled wait psw, * the processor is dead afterwards */ asm volatile (" stctl 0,0,0(%1)\n" " ni 0(%1),0xef\n" /* switch off protection */ " lctl 0,0,0(%1)\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 0(%1),0x10\n" /* fake protection bit */ " lpsw 0(%0)" : : "a" (dw_psw), "a" (&ctl_buf) : "cc" ); } #endif /* __ASM_S390_PROCESSOR_H */