204 lines
4.4 KiB
C
204 lines
4.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/asm-sh/processor.h
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*
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* Copyright (C) 1999, 2000 Niibe Yutaka
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* Copyright (C) 2002, 2003 Paul Mundt
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*/
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#ifndef __ASM_SH_PROCESSOR_32_H
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#define __ASM_SH_PROCESSOR_32_H
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <asm/page.h>
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#include <asm/types.h>
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#include <asm/hw_breakpoint.h>
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/* Core Processor Version Register */
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#define CCN_PVR 0xff000030
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#define CCN_CVR 0xff000040
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#define CCN_PRR 0xff000044
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/*
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* User space process size: 2GB.
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*
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* Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
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*/
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#define TASK_SIZE 0x7c000000UL
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
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/*
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* Bit of SR register
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*
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* FD-bit:
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* When it's set, it means the processor doesn't have right to use FPU,
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* and it results exception when the floating operation is executed.
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*
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* IMASK-bit:
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* Interrupt level mask
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*/
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#define SR_DSP 0x00001000
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#define SR_IMASK 0x000000f0
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#define SR_FD 0x00008000
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#define SR_MD 0x40000000
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#define SR_USER_MASK 0x00000303 // M, Q, S, T bits
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/*
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* DSP structure and data
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*/
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struct sh_dsp_struct {
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unsigned long dsp_regs[14];
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long status;
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};
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/*
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* FPU structure and data
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*/
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struct sh_fpu_hard_struct {
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unsigned long fp_regs[16];
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unsigned long xfp_regs[16];
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unsigned long fpscr;
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unsigned long fpul;
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long status; /* software status information */
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};
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/* Dummy fpu emulator */
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struct sh_fpu_soft_struct {
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unsigned long fp_regs[16];
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unsigned long xfp_regs[16];
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unsigned long fpscr;
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unsigned long fpul;
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unsigned char lookahead;
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unsigned long entry_pc;
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};
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union thread_xstate {
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struct sh_fpu_hard_struct hardfpu;
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struct sh_fpu_soft_struct softfpu;
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};
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struct thread_struct {
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/* Saved registers when thread is descheduled */
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unsigned long sp;
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unsigned long pc;
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/* Various thread flags, see SH_THREAD_xxx */
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unsigned long flags;
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/* Save middle states of ptrace breakpoints */
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struct perf_event *ptrace_bps[HBP_NUM];
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#ifdef CONFIG_SH_DSP
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/* Dsp status information */
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struct sh_dsp_struct dsp_status;
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#endif
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/* Extended processor state */
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union thread_xstate *xstate;
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/*
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* fpu_counter contains the number of consecutive context switches
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* that the FPU is used. If this is over a threshold, the lazy fpu
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* saving becomes unlazy to save the trap. This is an unsigned char
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* so that after 256 times the counter wraps and the behavior turns
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* lazy again; this to deal with bursty apps that only use FPU for
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* a short time
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*/
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unsigned char fpu_counter;
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};
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#define INIT_THREAD { \
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.sp = sizeof(init_stack) + (long) &init_stack, \
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.flags = 0, \
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}
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/* Forward declaration, a strange C thing */
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struct task_struct;
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extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
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/*
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* FPU lazy state save handling.
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*/
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static __inline__ void disable_fpu(void)
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{
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unsigned long __dummy;
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/* Set FD flag in SR */
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__asm__ __volatile__("stc sr, %0\n\t"
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"or %1, %0\n\t"
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"ldc %0, sr"
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: "=&r" (__dummy)
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: "r" (SR_FD));
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}
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static __inline__ void enable_fpu(void)
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{
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unsigned long __dummy;
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/* Clear out FD flag in SR */
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__asm__ __volatile__("stc sr, %0\n\t"
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"and %1, %0\n\t"
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"ldc %0, sr"
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: "=&r" (__dummy)
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: "r" (~SR_FD));
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}
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/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
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#define FPSCR_INIT 0x00080000
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#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
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#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
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/*
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* Return saved PC of a blocked thread.
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*/
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#define thread_saved_pc(tsk) (tsk->thread.pc)
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void show_trace(struct task_struct *tsk, unsigned long *sp,
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struct pt_regs *regs, const char *loglvl);
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#ifdef CONFIG_DUMP_CODE
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void show_code(struct pt_regs *regs);
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#else
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static inline void show_code(struct pt_regs *regs)
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{
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}
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#endif
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extern unsigned long __get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
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#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
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#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
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#define PREFETCH_STRIDE L1_CACHE_BYTES
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#define ARCH_HAS_PREFETCH
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#define ARCH_HAS_PREFETCHW
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static inline void prefetch(const void *x)
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{
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__builtin_prefetch(x, 0, 3);
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}
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static inline void prefetchw(const void *x)
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{
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__builtin_prefetch(x, 1, 3);
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}
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#endif
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#endif /* __ASM_SH_PROCESSOR_32_H */
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