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Diffstat (limited to 'include/asm-s390/processor.h')
| -rw-r--r-- | include/asm-s390/processor.h | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h new file mode 100644 index 000000000..d55567d94 --- /dev/null +++ b/include/asm-s390/processor.h @@ -0,0 +1,186 @@ +/* + * 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/page.h> +#include <asm/ptrace.h> + +/* + * 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_sec; + 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*/ +}; + +typedef struct thread_struct thread_struct; + +#define INIT_MMAP \ +{ &init_mm, 0, 0, NULL, PAGE_SHARED, \ +VM_READ | VM_WRITE | VM_EXEC, 1, NULL, &init_mm.mmap } + +#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,}}} \ +} + +/* need to define ... */ +#define start_thread(regs, new_psw, new_stackp) do { \ + unsigned long *u_stack = new_stackp; \ + regs->psw.mask = _USER_PSW_MASK; \ + regs->psw.addr = new_psw | 0x80000000 ; \ + get_user(regs->gprs[2],u_stack); \ + get_user(regs->gprs[3],u_stack+1); \ + get_user(regs->gprs[4],u_stack+2); \ + 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) +#define forget_segments() 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(&mem_map[MAP_NR(tsk)].count) + +#define init_task (init_task_union.task) +#define init_stack (init_task_union.stack) + +/* + * 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)]; + 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; + /* load disabled wait psw, the processor is dead afterwards */ + asm volatile ("lpsw 0(%0)" : : "a" (dw_psw)); +} + +#endif /* __ASM_S390_PROCESSOR_H */ |