#ifndef __ASM_SH64_PROCESSOR_H #define __ASM_SH64_PROCESSOR_H /* * 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. * * include/asm-sh64/processor.h * * Copyright (C) 2000, 2001 Paolo Alberelli * Copyright (C) 2003 Paul Mundt * Copyright (C) 2004 Richard Curnow * */ #include <asm/page.h> #ifndef __ASSEMBLY__ #include <asm/types.h> #include <asm/cache.h> #include <asm/registers.h> #include <linux/threads.h> #include <linux/compiler.h> /* * Default implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() ({ \ void *pc; \ unsigned long long __dummy = 0; \ __asm__("gettr tr0, %1\n\t" \ "pta 4, tr0\n\t" \ "gettr tr0, %0\n\t" \ "ptabs %1, tr0\n\t" \ :"=r" (pc), "=r" (__dummy) \ : "1" (__dummy)); \ pc; }) /* * CPU type and hardware bug flags. Kept separately for each CPU. */ enum cpu_type { CPU_SH5_101, CPU_SH5_103, CPU_SH_NONE }; /* * TLB information structure * * Defined for both I and D tlb, per-processor. */ struct tlb_info { unsigned long long next; unsigned long long first; unsigned long long last; unsigned int entries; unsigned int step; unsigned long flags; }; struct sh_cpuinfo { enum cpu_type type; unsigned long loops_per_jiffy; char hard_math; unsigned long *pgd_quick; unsigned long *pmd_quick; unsigned long *pte_quick; unsigned long pgtable_cache_sz; unsigned int cpu_clock, master_clock, bus_clock, module_clock; /* Cache info */ struct cache_info icache; struct cache_info dcache; /* TLB info */ struct tlb_info itlb; struct tlb_info dtlb; }; extern struct sh_cpuinfo boot_cpu_data; #define cpu_data (&boot_cpu_data) #define current_cpu_data boot_cpu_data #endif /* * User space process size: 2GB - 4k. */ #define TASK_SIZE 0x7ffff000UL /* This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE (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 * */ #define SR_FD 0x00008000 #if defined(CONFIG_SH64_SR_WATCH) #define SR_MMU 0x84000000 #else #define SR_MMU 0x80000000 #endif #define SR_IMASK 0x000000f0 #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 */ }; #if 0 /* Dummy fpu emulator */ struct sh_fpu_soft_struct { unsigned long long fp_regs[32]; unsigned int fpscr; unsigned char lookahead; unsigned long entry_pc; }; #endif union sh_fpu_union { struct sh_fpu_hard_struct hard; /* 'hard' itself only produces 32 bit alignment, yet we need to access it using 64 bit load/store as well. */ unsigned long long alignment_dummy; }; struct thread_struct { unsigned long sp; unsigned long pc; /* 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 trap_no, error_code; unsigned long address; /* Hardware debugging registers may come here */ /* floating point info */ union sh_fpu_union fpu; }; #define INIT_MMAP \ { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL } extern struct pt_regs fake_swapper_regs; #define INIT_THREAD { \ .sp = sizeof(init_stack) + \ (long) &init_stack, \ .pc = 0, \ .kregs = &fake_swapper_regs, \ .uregs = NULL, \ .trap_no = 0, \ .error_code = 0, \ .address = 0, \ .fpu = { { { 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) \ set_fs(USER_DS); \ 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 *); /* * create a kernel thread without removing it from tasklists */ 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) #define prepare_to_copy(tsk) do { } while (0) /* * FPU lazy state save handling. */ static inline void release_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 grab_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 /* Save the current FP regs */ void fpsave(struct sh_fpu_hard_struct *fpregs); /* Initialise the FP state of a task */ void fpinit(struct sh_fpu_hard_struct *fpregs); 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) #define cpu_relax() barrier() #endif /* __ASSEMBLY__ */ #endif /* __ASM_SH64_PROCESSOR_H */