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/* $Id: processor.h,v 1.3 1999/09/28 22:27:19 ralf Exp $
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994 Waldorf GMBH
* Copyright (C) 1995, 1996, 1997, 1998, 1999 Ralf Baechle
* Modified further for R[236]000 compatibility by Paul M. Antoine
* Copyright (C) 1999 Silicon Graphics, Inc.
*/
#ifndef _ASM_PROCESSOR_H
#define _ASM_PROCESSOR_H
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
#if !defined (_LANGUAGE_ASSEMBLY)
#include <asm/cachectl.h>
#include <asm/mipsregs.h>
#include <asm/reg.h>
#include <asm/system.h>
struct mips_cpuinfo {
unsigned long udelay_val;
unsigned long *pgd_quick;
unsigned long *pmd_quick;
unsigned long *pte_quick;
unsigned long pgtable_cache_sz;
};
/*
* System setup and hardware flags..
* XXX: Should go into mips_cpuinfo.
*/
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 */
extern char vce_available; /* Supports VCED / VCEI exceptions */
extern char mips4_available; /* CPU has MIPS IV ISA or better */
extern struct mips_cpuinfo boot_cpu_data;
extern unsigned int vced_count, vcei_count;
#ifdef __SMP__
extern struct mips_cpuinfo cpu_data[];
#define current_cpu_data cpu_data[smp_processor_id()]
#else
#define cpu_data &boot_cpu_data
#define current_cpu_data boot_cpu_data
#endif
/*
* 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 */
/* Lazy FPU handling on uni-processor */
extern struct task_struct *last_task_used_math;
/*
* User space process size: 1TB. This is hardcoded into a few places,
* so don't change it unless you know what you are doing. TASK_SIZE
* is limited to 1TB by the R4000 architecture; R10000 and better do
* support 16TB.
#define TASK_SIZE 0x80000000UL
*/
#define TASK_SIZE 0x10000000000UL
/* 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 {
unsigned long 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,},} \
}
typedef struct {
unsigned long seg;
} mm_segment_t;
/*
* If you change thread_struct remember to change the #defines below too!
*/
struct thread_struct {
/* Saved main processor registers. */
unsigned long reg16;
unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
unsigned long reg29, reg30, reg31;
/* Saved cp0 stuff. */
unsigned long cp0_status;
/* Saved fpu/fpu emulator stuff. */
union mips_fpu_union fpu;
/* Other stuff associated with the thread. */
unsigned long cp0_badvaddr; /* Last user fault */
unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
unsigned long error_code;
unsigned long trap_no;
#define MF_FIXADE 1 /* Fix address errors in software */
#define MF_LOGADE 2 /* Log address errors to syslog */
unsigned long mflags;
mm_segment_t current_ds;
unsigned long irix_trampoline; /* Wheee... */
unsigned long irix_oldctx;
};
#endif /* !defined (_LANGUAGE_ASSEMBLY) */
#define INIT_MMAP { &init_mm, KSEG0, KSEG1, NULL, PAGE_SHARED, \
VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
#define INIT_THREAD { \
/* \
* saved main processor registers \
*/ \
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, 0, \
/* \
* For now the default is to fix address errors \
*/ \
MF_FIXADE, { 0 }, 0, 0 \
}
#ifdef __KERNEL__
/* Linus sez 16kb is good for you ... */
#define KERNEL_STACK_SIZE 0x4000
#if !defined (_LANGUAGE_ASSEMBLY)
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/* Copy and release all segment info associated with a VM */
#define copy_segments(p, mm) do { } while(0)
#define release_segments(mm) do { } while(0)
#define forget_segments() do { } while (0)
/*
* 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];
}
struct pt_regs;
extern int (*user_mode)(struct pt_regs *);
/*
* Do necessary setup to start up a newly executed thread.
*/
#define start_thread(regs, new_pc, new_sp) do { \
/* New thread looses kernel privileges. */ \
regs->cp0_status = (regs->cp0_status & ~(ST0_CU0|ST0_KSU)) | KSU_USER;\
regs->cp0_epc = new_pc; \
regs->regs[29] = new_sp; \
current->thread.current_ds = USER_DS; \
} while (0)
/* Allocation and freeing of basic task resources. */
/*
* NOTE! The task struct and the stack go together
*/
#define THREAD_SIZE (2*PAGE_SIZE)
#define alloc_task_struct() \
((struct task_struct *) __get_free_pages(GFP_KERNEL, 2))
#define free_task_struct(p) free_pages((unsigned long)(p), 2)
#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.
*
* In gcc 2.8 and newer __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);})
#endif /* _ASM_PROCESSOR_H */
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