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/*
* include/asm-alpha/processor.h
*
* Copyright (C) 1994 Linus Torvalds
*/
#ifndef __ASM_ALPHA_PROCESSOR_H
#define __ASM_ALPHA_PROCESSOR_H
#include <linux/personality.h> /* for ADDR_LIMIT_32BIT */
/*
* Returns current instruction pointer ("program counter").
*/
#define current_text_addr() \
({ void *__pc; __asm__ ("br %0,.+4" : "=r"(__pc)); __pc; })
/*
* 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_THREAD { \
0, 0, 0, \
0, 0, 0, \
0, 0, 0, \
0, \
KERNEL_DS \
}
#define THREAD_SIZE (2*PAGE_SIZE)
#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 lose 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);
struct task_struct;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Create a kernel thread without removing it from tasklists. */
extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
#define copy_segments(tsk, mm) do { } while (0)
#define release_segments(mm) do { } while (0)
unsigned long get_wchan(struct task_struct *p);
/* See arch/alpha/kernel/ptrace.c for details. */
#define PT_REG(reg) (PAGE_SIZE*2 - sizeof(struct pt_regs) \
+ (long)&((struct pt_regs *)0)->reg)
#define SW_REG(reg) (PAGE_SIZE*2 - sizeof(struct pt_regs) \
- sizeof(struct switch_stack) \
+ (long)&((struct switch_stack *)0)->reg)
#define KSTK_EIP(tsk) \
(*(unsigned long *)(PT_REG(pc) + (unsigned long)(tsk)))
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
/* 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 get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count)
#define init_task (init_task_union.task)
#define init_stack (init_task_union.stack)
#define cpu_relax() do { } while (0)
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
#define ARCH_HAS_SPINLOCK_PREFETCH
extern inline void prefetch(const void *ptr)
{
__asm__ ("ldl $31,%0" : : "m"(*(char *)ptr));
}
extern inline void prefetchw(const void *ptr)
{
__asm__ ("ldl $31,%0" : : "m"(*(char *)ptr));
}
extern inline void spin_lock_prefetch(const void *ptr)
{
__asm__ ("ldl $31,%0" : : "m"(*(char *)ptr));
}
#endif /* __ASM_ALPHA_PROCESSOR_H */
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