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/*
* Copyright (C) 1994 Waldorf GMBH
* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
* Copyright (C) 1996 Paul M. Antoine
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*
* SPDX-License-Identifier: GPL-2.0
*/
#ifndef _ASM_PROCESSOR_H
#define _ASM_PROCESSOR_H
#include <asm/isadep.h>
#include <asm/cachectl.h>
#include <asm/mipsregs.h>
#include <asm/reg.h>
#include <asm/system.h>
/*
* Return current * instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
/*
* System setup and hardware flags..
*/
extern void (*cpu_wait)(void);
extern unsigned int vced_count, vcei_count;
#define NUM_FPU_REGS 32
typedef __u64 fpureg_t;
/*
* It would be nice to add some more fields for emulator statistics, but there
* are a number of fixed offsets in offset.h and elsewhere that would have to
* be recalculated by hand. So the additional information will be private to
* the FPU emulator for now. See asm-mips/fpu_emulator.h.
*/
struct mips_fpu_struct {
fpureg_t fpr[NUM_FPU_REGS];
unsigned int fcr31;
};
#define NUM_DSP_REGS 6
typedef __u32 dspreg_t;
struct mips_dsp_state {
dspreg_t dspr[NUM_DSP_REGS];
unsigned int dspcontrol;
};
typedef struct {
unsigned long seg;
} mm_segment_t;
#define ARCH_MIN_TASKALIGN 8
struct mips_abi;
/*
* 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. */
struct mips_fpu_struct fpu;
#ifdef CONFIG_MIPS_MT_FPAFF
/* Emulated instruction count */
unsigned long emulated_fp;
/* Saved per-thread scheduler affinity mask */
cpumask_t user_cpus_allowed;
#endif /* CONFIG_MIPS_MT_FPAFF */
/* Saved state of the DSP ASE, if available. */
struct mips_dsp_state dsp;
/* 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;
unsigned long irix_trampoline; /* Wheee... */
unsigned long irix_oldctx;
struct mips_abi *abi;
};
struct task_struct;
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
#define cpu_relax() barrier()
/*
* 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.
*
* __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);})
#ifdef CONFIG_CPU_HAS_PREFETCH
#define ARCH_HAS_PREFETCH
static inline void prefetch(const void *addr)
{
__asm__ __volatile__(
" .set mips4 \n"
" pref %0, (%1) \n"
" .set mips0 \n"
:
: "i" (Pref_Load), "r" (addr));
}
#endif
#endif /* _ASM_PROCESSOR_H */
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