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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | /* * include/asm-alpha/processor.h * * Copyright (C) 1994 Linus Torvalds */ #ifndef __ASM_ALPHA_PROCESSOR_H #define __ASM_ALPHA_PROCESSOR_H /* * We have a 42-bit user address space: 4TB user VM... */ #define TASK_SIZE (0x40000000000UL) /* This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE \ ((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2) /* * Bus types */ #define EISA_bus 1 #define EISA_bus__is_a_macro /* for versions in ksyms.c */ #define MCA_bus 0 #define MCA_bus__is_a_macro /* for versions in ksyms.c */ typedef struct { unsigned long seg; } mm_segment_t; struct thread_struct { /* the fields below are used by PALcode and must match struct pcb: */ unsigned long ksp; unsigned long usp; unsigned long ptbr; unsigned int pcc; unsigned int asn; unsigned long unique; /* * bit 0: floating point enable * bit 62: performance monitor enable */ unsigned long pal_flags; unsigned long res1, res2; /* * The fields below are Linux-specific: * * bit 1..6: IEEE_TRAP_ENABLE bits (see fpu.h) * bit 7..8: IEEE_MAP_XXX bits (see fpu.h) * bit 14..16: UAC bits (see sysinfo.h) * bit 17..22: IEEE_STATUS_MASK bits (see fpu.h) * bit 32..33: Current IEEE rounding mode (only used * during floating emulation - see fpu.h) * bit 63: die_if_kernel recursion lock */ unsigned long flags; /* Perform syscall argument validation (get/set_fs). */ mm_segment_t fs; /* Breakpoint handling for ptrace. */ unsigned long bpt_addr[2]; unsigned int bpt_insn[2]; int bpt_nsaved; }; #define INIT_MMAP { &init_mm, PAGE_OFFSET, PAGE_OFFSET+0x10000000, \ NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL } #define INIT_TSS { \ 0, 0, 0, \ 0, 0, 0, \ 0, 0, 0, \ 0, \ KERNEL_DS \ } #include <asm/ptrace.h> /* * Return saved PC of a blocked thread. This assumes the frame * pointer is the 6th saved long on the kernel stack and that the * saved return address is the first long in the frame. This all * holds provided the thread blocked through a call to schedule() ($15 * is the frame pointer in schedule() and $15 is saved at offset 48 by * entry.S:do_switch_stack). * * Under heavy swap load I've seen this loose in an ugly way. So do * some extra sanity checking on the ranges we expect these pointers * to be in so that we can fail gracefully. This is just for ps after * all. -- r~ */ extern inline unsigned long thread_saved_pc(struct thread_struct *t) { unsigned long fp, sp = t->ksp, base = (unsigned long)t; if (sp > base && sp+6*8 < base + 16*1024) { fp = ((unsigned long*)sp)[6]; if (fp > sp && fp < base + 16*1024) return *(unsigned long *)fp; } return 0; } /* * Do necessary setup to start up a newly executed thread. */ extern void start_thread(struct pt_regs *, unsigned long, unsigned long); /* Free all resources held by a thread. */ extern void release_thread(struct task_struct *); #define copy_segments(nr, tsk, mm) do { } while (0) #define release_segments(mm) do { } while (0) #define forget_segments() do { } while (0) /* 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 init_task (init_task_union.task) #define init_stack (init_task_union.stack) #endif /* __ASM_ALPHA_PROCESSOR_H */ |