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author | Ley Foon Tan <lftan@altera.com> | 2014-11-06 15:19:47 +0800 |
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committer | Ley Foon Tan <lftan@altera.com> | 2014-12-08 12:55:53 +0800 |
commit | 71995e4d004f6afbc86cc4a80c4a281f6c00b07f (patch) | |
tree | 68139e7bb9dfee02e23384224e2fa20082e55653 /arch/nios2/include/asm/processor.h | |
parent | cbd15b3fadc27e81a6e8a3d38ce13cde5ce7cb71 (diff) | |
download | op-kernel-dev-71995e4d004f6afbc86cc4a80c4a281f6c00b07f.zip op-kernel-dev-71995e4d004f6afbc86cc4a80c4a281f6c00b07f.tar.gz |
nios2: Process management
This patch adds support for thread creation and context switching.
Signed-off-by: Ley Foon Tan <lftan@altera.com>
Diffstat (limited to 'arch/nios2/include/asm/processor.h')
-rw-r--r-- | arch/nios2/include/asm/processor.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/processor.h b/arch/nios2/include/asm/processor.h new file mode 100644 index 0000000..3bd3494 --- /dev/null +++ b/arch/nios2/include/asm/processor.h @@ -0,0 +1,103 @@ +/* + * Copyright (C) 2013 Altera Corporation + * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> + * Copyright (C) 2004 Microtronix Datacom Ltd + * Copyright (C) 2001 Ken Hill (khill@microtronix.com) + * Vic Phillips (vic@microtronix.com) + * + * based on SPARC asm/processor_32.h which is: + * + * Copyright (C) 1994 David S. Miller + * + * 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. + */ + +#ifndef _ASM_NIOS2_PROCESSOR_H +#define _ASM_NIOS2_PROCESSOR_H + +#include <asm/ptrace.h> +#include <asm/registers.h> +#include <asm/page.h> + +#define NIOS2_FLAG_KTHREAD 0x00000001 /* task is a kernel thread */ + +#define NIOS2_OP_NOP 0x1883a +#define NIOS2_OP_BREAK 0x3da03a + +#ifdef __KERNEL__ + +#define STACK_TOP TASK_SIZE +#define STACK_TOP_MAX STACK_TOP + +#endif /* __KERNEL__ */ + +/* Kuser helpers is mapped to this user space address */ +#define KUSER_BASE 0x1000 +#define KUSER_SIZE (PAGE_SIZE) +#ifndef __ASSEMBLY__ + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + */ +#define current_text_addr() ({ __label__ _l; _l: &&_l; }) + +# define TASK_SIZE 0x7FFF0000UL +# define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) + +/* The Nios processor specific thread struct. */ +struct thread_struct { + struct pt_regs *kregs; + + /* Context switch saved kernel state. */ + unsigned long ksp; + unsigned long kpsr; +}; + +#define INIT_MMAP \ + { &init_mm, (0), (0), __pgprot(0x0), VM_READ | VM_WRITE | VM_EXEC } + +# define INIT_THREAD { \ + .kregs = NULL, \ + .ksp = 0, \ + .kpsr = 0, \ +} + +extern void start_thread(struct pt_regs *regs, unsigned long pc, + unsigned long sp); + +struct task_struct; + +/* Free all resources held by a thread. */ +static inline void release_thread(struct task_struct *dead_task) +{ +} + +/* Free current thread data structures etc.. */ +static inline void exit_thread(void) +{ +} + +/* Return saved PC of a blocked thread. */ +#define thread_saved_pc(tsk) ((tsk)->thread.kregs->ea) + +extern unsigned long get_wchan(struct task_struct *p); + +/* Prepare to copy thread state - unlazy all lazy status */ +#define prepare_to_copy(tsk) do { } while (0) + +#define task_pt_regs(p) \ + ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) + +/* Used by procfs */ +#define KSTK_EIP(tsk) ((tsk)->thread.kregs->ea) +#define KSTK_ESP(tsk) ((tsk)->thread.kregs->sp) + +#define cpu_relax() barrier() +#define cpu_relax_lowlatency() cpu_relax() + +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_NIOS2_PROCESSOR_H */ |