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/*
* include/asm-alpha/processor.h
*
* Copyright (C) 1994 Linus Torvalds
*/
#ifndef __ASM_ALPHA_PROCESSOR_H
#define __ASM_ALPHA_PROCESSOR_H
/*
* We have a 41-bit user address space: 2TB user VM.
* Under certain circumstances (e.g. when emulating 32-bit code)
* we may want to voluntarily limit this...
*/
#define TASK_SIZE (0x40000000000UL)
#define MAX_USER_ADDR ((current->personality&ADDR_MAX_32BIT) ? 0x100000000UL : \
((current->personality & ADDR_MAX_31BIT) ? 0x80000000UL : \
0x40000000000UL))
#define MMAP_SEARCH_START ((current->personality & ADDR_MAX_31BIT) ? \
(MAX_USER_ADDR/2) : (MAX_USER_ADDR/3))
/*
* 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 */
/*
* The alpha has no problems with write protection
*/
#define wp_works_ok 1
#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
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 0: perform syscall argument validation (get/set_fs)
* bit 1..5: IEEE_TRAP_ENABLE bits (see fpu.h)
* bit 17..21: IEEE_STATUS bits (see fpu.h)
*/
unsigned long flags;
};
#define INIT_MMAP { &init_mm, 0xfffffc0000000000, 0xfffffc0010000000, \
PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC }
#define INIT_TSS { \
0, 0, 0, \
0, 0, 0, \
0, 0, 0, \
0 \
}
#define alloc_kernel_stack() __get_free_page(GFP_KERNEL)
#define free_kernel_stack(page) free_page((page))
#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).
*/
extern inline unsigned long thread_saved_pc(struct thread_struct *t)
{
unsigned long fp;
fp = ((unsigned long*)t->ksp)[6];
return *(unsigned long*)fp;
}
/*
* Do necessary setup to start up a newly executed thread.
*/
extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
#endif /* __ASM_ALPHA_PROCESSOR_H */
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