patch-2.3.99-pre8 linux/include/asm-s390/processor.h

• Lines: 187
• Date: Fri May 12 11:41:44 2000
• Orig file: v2.3.99-pre7/linux/include/asm-s390/processor.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre7/linux/include/asm-s390/processor.h linux/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           */