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jcastillo |
/*
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* include/asm-alpha/processor.h
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*
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* Copyright (C) 1994 Linus Torvalds
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*/
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#ifndef __ASM_ALPHA_PROCESSOR_H
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#define __ASM_ALPHA_PROCESSOR_H
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/*
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* We have a 41-bit user address space: 2TB user VM.
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* Under certain circumstances (e.g. when emulating 32-bit code)
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* we may want to voluntarily limit this...
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*/
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#define TASK_SIZE (0x40000000000UL)
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#define MAX_USER_ADDR ((current->personality&ADDR_MAX_32BIT) ? 0x100000000UL : \
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((current->personality & ADDR_MAX_31BIT) ? 0x80000000UL : \
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0x40000000000UL))
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#define MMAP_SEARCH_START ((current->personality & ADDR_MAX_31BIT) ? \
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(MAX_USER_ADDR/2) : (MAX_USER_ADDR/3))
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/*
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* Bus types
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*/
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#define EISA_bus 1
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#define EISA_bus__is_a_macro /* for versions in ksyms.c */
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#define MCA_bus 0
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#define MCA_bus__is_a_macro /* for versions in ksyms.c */
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/*
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* The alpha has no problems with write protection
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*/
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#define wp_works_ok 1
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#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
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struct thread_struct {
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/* the fields below are used by PALcode and must match struct pcb: */
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unsigned long ksp;
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unsigned long usp;
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unsigned long ptbr;
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unsigned int pcc;
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unsigned int asn;
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unsigned long unique;
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/*
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* bit 0: floating point enable
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* bit 62: performance monitor enable
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*/
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unsigned long pal_flags;
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unsigned long res1, res2;
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/* the fields below are Linux-specific: */
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/*
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* bit 0: perform syscall argument validation (get/set_fs)
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* bit 1..5: IEEE_TRAP_ENABLE bits (see fpu.h)
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* bit 17..21: IEEE_STATUS bits (see fpu.h)
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*/
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unsigned long flags;
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};
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#define INIT_MMAP { &init_mm, 0xfffffc0000000000, 0xfffffc0010000000, \
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PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC }
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#define INIT_TSS { \
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0, 0, 0, \
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0, 0, 0, \
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0, 0, 0, \
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}
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#define alloc_kernel_stack() __get_free_page(GFP_KERNEL)
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#define free_kernel_stack(page) free_page((page))
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#include <asm/ptrace.h>
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/*
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* Return saved PC of a blocked thread. This assumes the frame
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* pointer is the 6th saved long on the kernel stack and that the
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* saved return address is the first long in the frame. This all
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* holds provided the thread blocked through a call to schedule() ($15
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* is the frame pointer in schedule() and $15 is saved at offset 48 by
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* entry.S:do_switch_stack).
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*/
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extern inline unsigned long thread_saved_pc(struct thread_struct *t)
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{
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unsigned long fp;
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fp = ((unsigned long*)t->ksp)[6];
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return *(unsigned long*)fp;
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}
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/*
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* Do necessary setup to start up a newly executed thread.
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*/
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extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
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#endif /* __ASM_ALPHA_PROCESSOR_H */
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