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/*
* include/asm-mips/processor.h
*
* Copyright (C) 1994 Waldorf Electronics
* written by Ralf Baechle
* Modified further for R[236]000 compatibility by Paul M. Antoine
*
* $Id: processor.h,v 1.5 1997/12/01 16:48:39 ralf Exp $
*/
#ifndef __ASM_MIPS_PROCESSOR_H
#define __ASM_MIPS_PROCESSOR_H
#if !defined (__LANGUAGE_ASSEMBLY__)
#include <asm/cachectl.h>
#include <asm/mipsregs.h>
#include <asm/reg.h>
#include <asm/system.h>
/*
* System setup and hardware flags..
*/
extern char wait_available; /* only available on R4[26]00 */
extern char cyclecounter_available; /* only available from R4000 upwards. */
extern char dedicated_iv_available; /* some embedded MIPS like Nevada */
/*
* Bus types (default is ISA, but people can check others with these..)
* MCA_bus hardcoded to 0 for now.
*
* This needs to be extended since MIPS systems are being delivered with
* numerous different types of bus systems.
*/
extern int EISA_bus;
#define MCA_bus 0
#define MCA_bus__is_a_macro /* for versions in ksyms.c */
/*
* MIPS has no problems with write protection
*/
#define wp_works_ok 1
#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
/*
* User space process size: 2GB. This is hardcoded into a few places,
* so don't change it unless you know what you are doing. TASK_SIZE
* for a 64 bit kernel expandable to 8192EB, of which the current MIPS
* implementations will "only" be able to use 1TB ...
*/
#define TASK_SIZE (0x80000000UL)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
/*
* Size of io_bitmap in longwords: 32 is ports 0-0x3ff.
*/
#define IO_BITMAP_SIZE 32
#define NUM_FPU_REGS 32
struct mips_fpu_hard_struct {
double fp_regs[NUM_FPU_REGS];
unsigned int control;
};
/*
* FIXME: no fpu emulator yet (but who cares anyway?)
*/
struct mips_fpu_soft_struct {
long dummy;
};
union mips_fpu_union {
struct mips_fpu_hard_struct hard;
struct mips_fpu_soft_struct soft;
};
#define INIT_FPU { \
{{0,},} \
}
/*
* If you change thread_struct remember to change the #defines below too!
*/
struct thread_struct {
/* Saved main processor registers. */
unsigned long reg16 __attribute__ ((aligned (8)));
unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
unsigned long reg28, reg29, reg30, reg31;
/* Saved cp0 stuff. */
unsigned long cp0_status;
/* Saved fpu/fpu emulator stuff. */
union mips_fpu_union fpu __attribute__ ((aligned (8)));
/* Other stuff associated with the thread. */
unsigned long cp0_badvaddr;
unsigned long error_code;
unsigned long trap_no;
unsigned long ksp; /* Top of kernel stack */
unsigned long pg_dir; /* used in tlb refill */
#define MF_FIXADE 1 /* Fix address errors in software */
#define MF_LOGADE 2 /* Log address errors to syslog */
unsigned long mflags;
int current_ds;
unsigned long irix_trampoline; /* Wheee... */
unsigned long irix_oldctx;
};
#endif /* !defined (__LANGUAGE_ASSEMBLY__) */
#define INIT_MMAP { &init_mm, KSEG0, KSEG1, PAGE_SHARED, \
VM_READ | VM_WRITE | VM_EXEC, NULL, &init_mm.mmap }
#define INIT_TSS { \
/* \
* saved main processor registers \
*/ \
0, 0, 0, 0, 0, 0, 0, 0, \
0, 0, 0, 0, \
/* \
* saved cp0 stuff \
*/ \
0, \
/* \
* saved fpu/fpu emulator stuff \
*/ \
INIT_FPU, \
/* \
* Other stuff associated with the process \
*/ \
0, 0, 0, (unsigned long)&init_task_union + KERNEL_STACK_SIZE - 32, \
(unsigned long) swapper_pg_dir, \
/* \
* For now the default is to fix address errors \
*/ \
MF_FIXADE, 0, 0, 0 \
}
#ifdef __KERNEL__
#define KERNEL_STACK_SIZE 8192
#if !defined (__LANGUAGE_ASSEMBLY__)
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/*
* Return saved PC of a blocked thread.
*/
extern inline unsigned long thread_saved_pc(struct thread_struct *t)
{
extern void ret_from_sys_call(void);
/* New born processes are a special case */
if (t->reg31 == (unsigned long) ret_from_sys_call)
return t->reg31;
return ((unsigned long*)t->reg29)[17];
}
/*
* Do necessary setup to start up a newly executed thread.
*/
extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
/*
* Does the process account for user or for system time?
*/
extern int (*running_in_user_mode)(void);
#define USES_USER_TIME(regs) running_in_user_mode()
/* Allocation and freeing of basic task resources. */
/*
* NOTE! The task struct and the stack go together
*/
#define alloc_task_struct() \
((struct task_struct *) __get_free_pages(GFP_KERNEL,1,0))
#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 /* !defined (__LANGUAGE_ASSEMBLY__) */
#endif /* __KERNEL__ */
/*
* 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 GCC
* aborts compilation on some CPUs. It's simply not possible to unwind
* some CPU's stackframes.
*/
#if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
/*
* __builtin_return_address works only for non-leaf functions. We avoid the
* overhead of a function call by forcing the compiler to save the return
* address register on the stack.
*/
#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
#else
/*
* __builtin_return_address is not implemented at all. Calling it
* will return senseless values. Return NULL which at least is an obviously
* senseless value.
*/
#define return_address() NULL
#endif
#endif /* __ASM_MIPS_PROCESSOR_H */
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