| 1 | /* |
| 2 | * arch/ubicom32/include/asm/processor.h |
| 3 | * Thread related definitions for Ubicom32 architecture. |
| 4 | * |
| 5 | * (C) Copyright 2009, Ubicom, Inc. |
| 6 | * Copyright (C) 1995 Hamish Macdonald |
| 7 | * |
| 8 | * This file is part of the Ubicom32 Linux Kernel Port. |
| 9 | * |
| 10 | * The Ubicom32 Linux Kernel Port is free software: you can redistribute |
| 11 | * it and/or modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation, either version 2 of the |
| 13 | * License, or (at your option) any later version. |
| 14 | * |
| 15 | * The Ubicom32 Linux Kernel Port is distributed in the hope that it |
| 16 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 17 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 18 | * the GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with the Ubicom32 Linux Kernel Port. If not, |
| 22 | * see <http://www.gnu.org/licenses/>. |
| 23 | * |
| 24 | * Ubicom32 implementation derived from (with many thanks): |
| 25 | * arch/m68knommu |
| 26 | * arch/blackfin |
| 27 | * arch/parisc |
| 28 | */ |
| 29 | |
| 30 | #ifndef _ASM_UBICOM32_PROCESSOR_H |
| 31 | #define _ASM_UBICOM32_PROCESSOR_H |
| 32 | |
| 33 | /* |
| 34 | * Default implementation of macro that returns current |
| 35 | * instruction pointer ("program counter"). |
| 36 | */ |
| 37 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) |
| 38 | |
| 39 | #include <linux/compiler.h> |
| 40 | #include <linux/threads.h> |
| 41 | #include <asm/types.h> |
| 42 | #include <asm/segment.h> |
| 43 | #include <asm/fpu.h> |
| 44 | #include <asm/ptrace.h> |
| 45 | #include <asm/current.h> |
| 46 | #include <asm/thread_info.h> |
| 47 | |
| 48 | #if defined(CONFIG_UBICOM32_V3) |
| 49 | #define CPU "IP5K" |
| 50 | #endif |
| 51 | #if defined(CONFIG_UBICOM32_V4) |
| 52 | #define CPU "IP7K" |
| 53 | #endif |
| 54 | #ifndef CPU |
| 55 | #define CPU "UNKNOWN" |
| 56 | #endif |
| 57 | |
| 58 | /* |
| 59 | * User space process size: 1st byte beyond user address space. |
| 60 | */ |
| 61 | extern unsigned long memory_end; |
| 62 | #define TASK_SIZE (memory_end) |
| 63 | |
| 64 | /* |
| 65 | * This decides where the kernel will search for a free chunk of vm |
| 66 | * space during mmap's. We won't be using it |
| 67 | */ |
| 68 | #define TASK_UNMAPPED_BASE 0 |
| 69 | |
| 70 | /* |
| 71 | * This is the structure where we are going to save callee-saved registers. |
| 72 | * A5 is the return address, A7 is the stack pointer, A6 is the frame |
| 73 | * pointer. This is the frame that is created because of switch_to. This |
| 74 | * is not the frame due to interrupt preemption or because of syscall entry. |
| 75 | */ |
| 76 | |
| 77 | struct thread_struct { |
| 78 | unsigned long d10; /* D10 */ |
| 79 | unsigned long d11; /* D11 */ |
| 80 | unsigned long d12; /* D12 */ |
| 81 | unsigned long d13; /* D13 */ |
| 82 | unsigned long a1; /* A1 */ |
| 83 | unsigned long a2; /* A2 */ |
| 84 | unsigned long a5; /* A5 return address. */ |
| 85 | unsigned long a6; /* A6 */ |
| 86 | unsigned long sp; /* A7 kernel stack pointer. */ |
| 87 | }; |
| 88 | |
| 89 | #define INIT_THREAD { \ |
| 90 | 0, 0, 0, 0, 0, 0, 0, 0, \ |
| 91 | sizeof(init_stack) + (unsigned long) init_stack - 8, \ |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * Do necessary setup to start up a newly executed thread. |
| 96 | * |
| 97 | * pass the data segment into user programs if it exists, |
| 98 | * it can't hurt anything as far as I can tell |
| 99 | */ |
| 100 | /* |
| 101 | * Do necessary setup to start up a newly executed thread. |
| 102 | */ |
| 103 | #define start_thread(regs, new_pc, new_sp) \ |
| 104 | do { \ |
| 105 | regs->pc = new_pc & ~3; \ |
| 106 | regs->an[5] = new_pc & ~3; \ |
| 107 | regs->an[7] = new_sp; \ |
| 108 | regs->nesting_level = -1; \ |
| 109 | regs->frame_type = UBICOM32_FRAME_TYPE_NEW_THREAD; \ |
| 110 | regs->thread_type = NORMAL_THREAD; \ |
| 111 | } while(0) |
| 112 | |
| 113 | /* Forward declaration, a strange C thing */ |
| 114 | struct task_struct; |
| 115 | |
| 116 | /* Free all resources held by a thread. */ |
| 117 | static inline void release_thread(struct task_struct *dead_task) |
| 118 | { |
| 119 | } |
| 120 | |
| 121 | /* Prepare to copy thread state - unlazy all lazy status */ |
| 122 | #define prepare_to_copy(tsk) do { } while (0) |
| 123 | |
| 124 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); |
| 125 | |
| 126 | /* |
| 127 | * Free current thread data structures etc.. |
| 128 | */ |
| 129 | static inline void exit_thread(void) |
| 130 | { |
| 131 | } |
| 132 | |
| 133 | unsigned long thread_saved_pc(struct task_struct *tsk); |
| 134 | unsigned long get_wchan(struct task_struct *p); |
| 135 | |
| 136 | #define KSTK_EIP(tsk) (tsk->thread.a5) |
| 137 | #define KSTK_ESP(tsk) (tsk->thread.sp) |
| 138 | |
| 139 | #define cpu_relax() barrier() |
| 140 | |
| 141 | extern void processor_init(void); |
| 142 | extern unsigned int processor_timers(void); |
| 143 | extern unsigned int processor_threads(void); |
| 144 | extern unsigned int processor_frequency(void); |
| 145 | extern int processor_interrupts(unsigned int *int0, unsigned int *int1); |
| 146 | extern void processor_ocm(unsigned long *socm, unsigned long *eocm); |
| 147 | extern void processor_dram(unsigned long *sdram, unsigned long *edram); |
| 148 | |
| 149 | #define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long)) |
| 150 | #define KSTK_TOP(info) \ |
| 151 | ({ \ |
| 152 | unsigned long *__ptr = (unsigned long *)(info); \ |
| 153 | (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \ |
| 154 | }) |
| 155 | |
| 156 | #define task_pt_regs(task) \ |
| 157 | ({ \ |
| 158 | struct pt_regs *__regs__; \ |
| 159 | __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \ |
| 160 | __regs__ - 1; \ |
| 161 | }) |
| 162 | |
| 163 | #endif /* _ASM_UBICOM32_PROCESSOR_H */ |
| 164 | |
