include/asm-alpha/processor.h

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 1 /*
 2  * include/asm-alpha/processor.h
 3  *
 4  * Copyright (C) 1994 Linus Torvalds
 5  */
 6
 7 #ifndef __ASM_ALPHA_PROCESSOR_H
 8 #define __ASM_ALPHA_PROCESSOR_H
 9
 10 /*
 11  * Returns current instruction pointer ("program counter").
 12  */
 13 #define current_text_addr() \
 14  ({ void *__pc; __asm__ ("br %0,.+4" :"=r"(__pc)); __pc; })
 15
 16 /*
 17  * We have a 42-bit user address space: 4TB user VM...
 18  */
 19 #define TASK_SIZE (0x40000000000UL)
 20
 21 /* This decides where the kernel will search for a free chunk of vm
 22  * space during mmap's.
 23  */
 24 #define TASK_UNMAPPED_BASE \
 25  ((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2)
 26
 27 /*
 28  * Bus types
 29  */
 30 #define EISA_bus 1
 31 #define EISA_bus__is_a_macro/* for versions in ksyms.c */
 32 #define MCA_bus 0
 33 #define MCA_bus__is_a_macro/* for versions in ksyms.c */
 34
 35 typedefstruct{
 36 unsigned long seg;
 37 } mm_segment_t;
 38
 39 struct thread_struct {
 40 /* the fields below are used by PALcode and must match struct pcb: */
 41 unsigned long ksp;
 42 unsigned long usp;
 43 unsigned long ptbr;
 44 unsigned int pcc;
 45 unsigned int asn;
 46 unsigned long unique;
 47 /*
 48  * bit 0: floating point enable
 49  * bit 62: performance monitor enable
 50  */
 51 unsigned long pal_flags;
 52 unsigned long res1, res2;
 53
 54 /*
 55  * The fields below are Linux-specific:
 56  *
 57  * bit 1..5: IEEE_TRAP_ENABLE bits (see fpu.h)
 58  * bit 6..8: UAC bits (see sysinfo.h)
 59  * bit 17..21: IEEE_STATUS_MASK bits (see fpu.h)
 60  * bit 63: die_if_kernel recursion lock
 61  */
 62 unsigned long flags;
 63
 64 /* Perform syscall argument validation (get/set_fs). */
 65  mm_segment_t fs;
 66
 67 /* Breakpoint handling for ptrace. */
 68 unsigned long bpt_addr[2];
 69 unsigned int bpt_insn[2];
 70 int bpt_nsaved;
 71 };
 72
 73 #define INIT_MMAP { &init_mm, PAGE_OFFSET, PAGE_OFFSET+0x10000000, \
 74  NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
 75
 76 #define INIT_THREAD { \
 77  0, 0, 0, \
 78  0, 0, 0, \
 79  0, 0, 0, \
 80  0, \
 81  KERNEL_DS \
 82 }
 83
 84 #define THREAD_SIZE (2*PAGE_SIZE)
 85
 86 #include <asm/ptrace.h>
 87
 88 /*
 89  * Return saved PC of a blocked thread. This assumes the frame
 90  * pointer is the 6th saved long on the kernel stack and that the
 91  * saved return address is the first long in the frame. This all
 92  * holds provided the thread blocked through a call to schedule() ($15
 93  * is the frame pointer in schedule() and $15 is saved at offset 48 by
 94  * entry.S:do_switch_stack).
 95  *
 96  * Under heavy swap load I've seen this lose in an ugly way. So do
 97  * some extra sanity checking on the ranges we expect these pointers
 98  * to be in so that we can fail gracefully. This is just for ps after
 99  * all. -- r~
 100  */
 101 extern inlineunsigned longthread_saved_pc(struct thread_struct *t)
 102 {
 103 unsigned long fp, sp = t->ksp, base = (unsigned long)t;
 104
 105 if(sp > base && sp+6*8< base +16*1024) {
 106  fp = ((unsigned long*)sp)[6];
 107 if(fp > sp && fp < base +16*1024)
 108 return*(unsigned long*)fp;
 109 }
 110
 111 return0;
 112 }
 113
 114 /* Do necessary setup to start up a newly executed thread. */
 115 externvoidstart_thread(struct pt_regs *,unsigned long,unsigned long);
 116
 117 /* Free all resources held by a thread. */
 118 externvoidrelease_thread(struct task_struct *);
 119
 120 /* Create a kernel thread without removing it from tasklists. */
 121 externlongkernel_thread(int(*fn)(void*),void*arg,unsigned long flags);
 122
 123 #define copy_segments(tsk, mm) do { } while (0)
 124 #define release_segments(mm) do { } while (0)
 125 #define forget_segments() do { } while (0)
 126
 127 /* NOTE: The task struct and the stack go together! */
 128 #define alloc_task_struct() \
 129  ((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
 130 #define free_task_struct(p) free_pages((unsigned long)(p),1)
 131
 132 #define init_task (init_task_union.task)
 133 #define init_stack (init_task_union.stack)
 134
 135 #endif/* __ASM_ALPHA_PROCESSOR_H */