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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_SH_PROCESSOR_64_H #define __ASM_SH_PROCESSOR_64_H /* * include/asm-sh/processor_64.h * * Copyright (C) 2000, 2001 Paolo Alberelli * Copyright (C) 2003 Paul Mundt * Copyright (C) 2004 Richard Curnow */ #ifndef __ASSEMBLY__ #include <linux/compiler.h> #include <asm/page.h> #include <asm/types.h> #include <cpu/registers.h> #endif /* * User space process size: 2GB - 4k. */ #define TASK_SIZE 0x7ffff000UL #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX STACK_TOP /* This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) /* * Bit of SR register * * FD-bit: * When it's set, it means the processor doesn't have right to use FPU, * and it results exception when the floating operation is executed. * * IMASK-bit: * Interrupt level mask * * STEP-bit: * Single step bit * */ #if defined(CONFIG_SH64_SR_WATCH) #define SR_MMU 0x84000000 #else #define SR_MMU 0x80000000 #endif #define SR_IMASK 0x000000f0 #define SR_FD 0x00008000 #define SR_SSTEP 0x08000000 #ifndef __ASSEMBLY__ /* * FPU structure and data : require 8-byte alignment as we need to access it with fld.p, fst.p */ struct sh_fpu_hard_struct { unsigned long fp_regs[64]; unsigned int fpscr; /* long status; * software status information */ }; /* Dummy fpu emulator */ struct sh_fpu_soft_struct { unsigned long fp_regs[64]; unsigned int fpscr; unsigned char lookahead; unsigned long entry_pc; }; union thread_xstate { struct sh_fpu_hard_struct hardfpu; struct sh_fpu_soft_struct softfpu; /* * The structure definitions only produce 32 bit alignment, yet we need * to access them using 64 bit load/store as well. */ unsigned long long alignment_dummy; }; struct thread_struct { unsigned long sp; unsigned long pc; /* Various thread flags, see SH_THREAD_xxx */ unsigned long flags; /* This stores the address of the pt_regs built during a context switch, or of the register save area built for a kernel mode exception. It is used for backtracing the stack of a sleeping task or one that traps in kernel mode. */ struct pt_regs *kregs; /* This stores the address of the pt_regs constructed on entry from user mode. It is a fixed value over the lifetime of a process, or NULL for a kernel thread. */ struct pt_regs *uregs; unsigned long address; /* Hardware debugging registers may come here */ /* floating point info */ union thread_xstate *xstate; /* * fpu_counter contains the number of consecutive context switches * that the FPU is used. If this is over a threshold, the lazy fpu * saving becomes unlazy to save the trap. This is an unsigned char * so that after 256 times the counter wraps and the behavior turns * lazy again; this to deal with bursty apps that only use FPU for * a short time */ unsigned char fpu_counter; }; #define INIT_MMAP \ { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL } #define INIT_THREAD { \ .sp = sizeof(init_stack) + \ (long) &init_stack, \ .pc = 0, \ .kregs = &fake_swapper_regs, \ .uregs = NULL, \ .address = 0, \ .flags = 0, \ } /* * Do necessary setup to start up a newly executed thread. */ #define SR_USER (SR_MMU | SR_FD) #define start_thread(_regs, new_pc, new_sp) \ _regs->sr = SR_USER; /* User mode. */ \ _regs->pc = new_pc - 4; /* Compensate syscall exit */ \ _regs->pc |= 1; /* Set SHmedia ! */ \ _regs->regs[18] = 0; \ _regs->regs[15] = new_sp /* Forward declaration, a strange C thing */ struct task_struct; struct mm_struct; /* Free all resources held by a thread. */ extern void release_thread(struct task_struct *); /* * FPU lazy state save handling. */ static inline void disable_fpu(void) { unsigned long long __dummy; /* Set FD flag in SR */ __asm__ __volatile__("getcon " __SR ", %0\n\t" "or %0, %1, %0\n\t" "putcon %0, " __SR "\n\t" : "=&r" (__dummy) : "r" (SR_FD)); } static inline void enable_fpu(void) { unsigned long long __dummy; /* Clear out FD flag in SR */ __asm__ __volatile__("getcon " __SR ", %0\n\t" "and %0, %1, %0\n\t" "putcon %0, " __SR "\n\t" : "=&r" (__dummy) : "r" (~SR_FD)); } /* Round to nearest, no exceptions on inexact, overflow, underflow, zero-divide, invalid. Configure option for whether to flush denorms to zero, or except if a denorm is encountered. */ #if defined(CONFIG_SH64_FPU_DENORM_FLUSH) #define FPSCR_INIT 0x00040000 #else #define FPSCR_INIT 0x00000000 #endif #ifdef CONFIG_SH_FPU /* Initialise the FP state of a task */ void fpinit(struct sh_fpu_hard_struct *fpregs); #else #define fpinit(fpregs) do { } while (0) #endif extern struct task_struct *last_task_used_math; /* * Return saved PC of a blocked thread. */ #define thread_saved_pc(tsk) (tsk->thread.pc) extern unsigned long get_wchan(struct task_struct *p); #define KSTK_EIP(tsk) ((tsk)->thread.pc) #define KSTK_ESP(tsk) ((tsk)->thread.sp) #endif /* __ASSEMBLY__ */ #endif /* __ASM_SH_PROCESSOR_64_H */
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