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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 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..5: IEEE_TRAP_ENABLE bits (see fpu.h)
* bit 6..8: UAC bits (see sysinfo.h)
* bit 17..21: IEEE_STATUS_MASK bits (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, \
PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, NULL, &init_mm.mmap }
#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)
/* 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)
/*
* Return_address is a replacement for __builtin_return_address(count)
* which on certain architectures cannot reasonably be implemented in GCC
* (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
* Note that __builtin_return_address(x>=1) is forbidden because the GCC
* aborts compilation on some CPUs. It's simply not possible to unwind
* some CPU's stackframes.
*/
#define return_address() __builtin_return_address(0)
#endif /* __ASM_ALPHA_PROCESSOR_H */
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