David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1 | /* MN10300 Processor specifics |
| 2 | * |
| 3 | * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. |
| 4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 5 | * Written by David Howells (dhowells@redhat.com) |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public Licence |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the Licence, or (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #ifndef _ASM_PROCESSOR_H |
| 14 | #define _ASM_PROCESSOR_H |
| 15 | |
| 16 | #include <asm/page.h> |
| 17 | #include <asm/ptrace.h> |
| 18 | #include <asm/cpu-regs.h> |
| 19 | #include <linux/threads.h> |
| 20 | |
| 21 | /* Forward declaration, a strange C thing */ |
| 22 | struct task_struct; |
| 23 | struct mm_struct; |
| 24 | |
| 25 | /* |
| 26 | * Default implementation of macro that returns current |
| 27 | * instruction pointer ("program counter"). |
| 28 | */ |
| 29 | #define current_text_addr() \ |
| 30 | ({ \ |
| 31 | void *__pc; \ |
| 32 | asm("mov pc,%0" : "=a"(__pc)); \ |
| 33 | __pc; \ |
| 34 | }) |
| 35 | |
| 36 | extern void show_registers(struct pt_regs *regs); |
| 37 | |
| 38 | /* |
| 39 | * CPU type and hardware bug flags. Kept separately for each CPU. |
| 40 | * Members of this structure are referenced in head.S, so think twice |
| 41 | * before touching them. [mj] |
| 42 | */ |
| 43 | |
| 44 | struct mn10300_cpuinfo { |
| 45 | int type; |
| 46 | unsigned long loops_per_sec; |
| 47 | char hard_math; |
| 48 | unsigned long *pgd_quick; |
| 49 | unsigned long *pte_quick; |
| 50 | unsigned long pgtable_cache_sz; |
| 51 | }; |
| 52 | |
| 53 | extern struct mn10300_cpuinfo boot_cpu_data; |
| 54 | |
| 55 | #define cpu_data &boot_cpu_data |
| 56 | #define current_cpu_data boot_cpu_data |
| 57 | |
| 58 | extern void identify_cpu(struct mn10300_cpuinfo *); |
| 59 | extern void print_cpu_info(struct mn10300_cpuinfo *); |
| 60 | extern void dodgy_tsc(void); |
| 61 | #define cpu_relax() do {} while (0) |
| 62 | |
| 63 | /* |
| 64 | * User space process size: 1.75GB (default). |
| 65 | */ |
| 66 | #define TASK_SIZE 0x70000000 |
| 67 | |
| 68 | /* |
| 69 | * Where to put the userspace stack by default |
| 70 | */ |
| 71 | #define STACK_TOP 0x70000000 |
| 72 | #define STACK_TOP_MAX STACK_TOP |
| 73 | |
| 74 | /* This decides where the kernel will search for a free chunk of vm |
| 75 | * space during mmap's. |
| 76 | */ |
| 77 | #define TASK_UNMAPPED_BASE 0x30000000 |
| 78 | |
| 79 | typedef struct { |
| 80 | unsigned long seg; |
| 81 | } mm_segment_t; |
| 82 | |
| 83 | struct fpu_state_struct { |
| 84 | unsigned long fs[32]; /* fpu registers */ |
| 85 | unsigned long fpcr; /* fpu control register */ |
| 86 | }; |
| 87 | |
| 88 | struct thread_struct { |
| 89 | struct pt_regs *uregs; /* userspace register frame */ |
| 90 | unsigned long pc; /* kernel PC */ |
| 91 | unsigned long sp; /* kernel SP */ |
| 92 | unsigned long a3; /* kernel FP */ |
| 93 | unsigned long wchan; |
| 94 | unsigned long usp; |
| 95 | struct pt_regs *__frame; |
| 96 | unsigned long fpu_flags; |
| 97 | #define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */ |
| 98 | struct fpu_state_struct fpu_state; |
| 99 | }; |
| 100 | |
| 101 | #define INIT_THREAD \ |
| 102 | { \ |
| 103 | .uregs = init_uregs, \ |
| 104 | .pc = 0, \ |
| 105 | .sp = 0, \ |
| 106 | .a3 = 0, \ |
| 107 | .wchan = 0, \ |
| 108 | .__frame = NULL, \ |
| 109 | } |
| 110 | |
| 111 | #define INIT_MMAP \ |
| 112 | { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \ |
| 113 | NULL, NULL } |
| 114 | |
| 115 | /* |
| 116 | * do necessary setup to start up a newly executed thread |
| 117 | * - need to discard the frame stacked by the kernel thread invoking the execve |
| 118 | * syscall (see RESTORE_ALL macro) |
| 119 | */ |
| 120 | #define start_thread(regs, new_pc, new_sp) do { \ |
| 121 | set_fs(USER_DS); \ |
| 122 | __frame = current->thread.uregs; \ |
| 123 | __frame->epsw = EPSW_nSL | EPSW_IE | EPSW_IM; \ |
| 124 | __frame->pc = new_pc; \ |
| 125 | __frame->sp = new_sp; \ |
| 126 | } while (0) |
| 127 | |
| 128 | /* Free all resources held by a thread. */ |
| 129 | extern void release_thread(struct task_struct *); |
| 130 | |
| 131 | /* Prepare to copy thread state - unlazy all lazy status */ |
| 132 | extern void prepare_to_copy(struct task_struct *tsk); |
| 133 | |
| 134 | /* |
| 135 | * create a kernel thread without removing it from tasklists |
| 136 | */ |
| 137 | extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
| 138 | |
| 139 | /* |
| 140 | * Return saved PC of a blocked thread. |
| 141 | */ |
| 142 | extern unsigned long thread_saved_pc(struct task_struct *tsk); |
| 143 | |
| 144 | unsigned long get_wchan(struct task_struct *p); |
| 145 | |
| 146 | #define task_pt_regs(task) \ |
| 147 | ({ \ |
| 148 | struct pt_regs *__regs__; \ |
| 149 | __regs__ = (struct pt_regs *) (KSTK_TOP(task_stack_page(task)) - 8); \ |
| 150 | __regs__ - 1; \ |
| 151 | }) |
| 152 | |
| 153 | #define KSTK_EIP(task) (task_pt_regs(task)->pc) |
| 154 | #define KSTK_ESP(task) (task_pt_regs(task)->sp) |
| 155 | |
| 156 | #define KSTK_TOP(info) \ |
| 157 | ({ \ |
| 158 | (unsigned long)(info) + THREAD_SIZE; \ |
| 159 | }) |
| 160 | |
| 161 | #define ARCH_HAS_PREFETCH |
| 162 | #define ARCH_HAS_PREFETCHW |
| 163 | |
| 164 | static inline void prefetch(const void *x) |
| 165 | { |
| 166 | #ifndef CONFIG_MN10300_CACHE_DISABLED |
| 167 | #ifdef CONFIG_MN10300_PROC_MN103E010 |
| 168 | asm volatile ("nop; nop; dcpf (%0)" : : "r"(x)); |
| 169 | #else |
| 170 | asm volatile ("dcpf (%0)" : : "r"(x)); |
| 171 | #endif |
| 172 | #endif |
| 173 | } |
| 174 | |
| 175 | static inline void prefetchw(const void *x) |
| 176 | { |
| 177 | #ifndef CONFIG_MN10300_CACHE_DISABLED |
| 178 | #ifdef CONFIG_MN10300_PROC_MN103E010 |
| 179 | asm volatile ("nop; nop; dcpf (%0)" : : "r"(x)); |
| 180 | #else |
| 181 | asm volatile ("dcpf (%0)" : : "r"(x)); |
| 182 | #endif |
| 183 | #endif |
| 184 | } |
| 185 | |
| 186 | #endif /* _ASM_PROCESSOR_H */ |