diff options
Diffstat (limited to 'arch/microblaze/include/asm/processor.h')
| -rw-r--r-- | arch/microblaze/include/asm/processor.h | 95 |
1 files changed, 91 insertions, 4 deletions
diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h index 9329029d2614..563c6b9453f0 100644 --- a/arch/microblaze/include/asm/processor.h +++ b/arch/microblaze/include/asm/processor.h @@ -1,6 +1,6 @@ /* - * Copyright (C) 2008 Michal Simek - * Copyright (C) 2008 PetaLogix + * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2008-2009 PetaLogix * Copyright (C) 2006 Atmark Techno, Inc. * * This file is subject to the terms and conditions of the GNU General Public @@ -26,14 +26,15 @@ extern const struct seq_operations cpuinfo_op; # define cpu_sleep() do {} while (0) # define prepare_to_copy(tsk) do {} while (0) -# endif /* __ASSEMBLY__ */ - #define task_pt_regs(tsk) \ (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1) /* Do necessary setup to start up a newly executed thread. */ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp); +# endif /* __ASSEMBLY__ */ + +# ifndef CONFIG_MMU /* * User space process size: memory size * @@ -85,4 +86,90 @@ extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); # define KSTK_EIP(tsk) (0) # define KSTK_ESP(tsk) (0) +# else /* CONFIG_MMU */ + +/* + * This is used to define STACK_TOP, and with MMU it must be below + * kernel base to select the correct PGD when handling MMU exceptions. + */ +# define TASK_SIZE (CONFIG_KERNEL_START) + +/* + * This decides where the kernel will search for a free chunk of vm + * space during mmap's. + */ +# define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) + +# define THREAD_KSP 0 + +# ifndef __ASSEMBLY__ + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + */ +# define current_text_addr() ({ __label__ _l; _l: &&_l; }) + +/* If you change this, you must change the associated assembly-languages + * constants defined below, THREAD_*. + */ +struct thread_struct { + /* kernel stack pointer (must be first field in structure) */ + unsigned long ksp; + unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ + void *pgdir; /* root of page-table tree */ + struct pt_regs *regs; /* Pointer to saved register state */ +}; + +# define INIT_THREAD { \ + .ksp = sizeof init_stack + (unsigned long)init_stack, \ + .pgdir = swapper_pg_dir, \ +} + +/* Do necessary setup to start up a newly executed thread. */ +void start_thread(struct pt_regs *regs, + unsigned long pc, unsigned long usp); + +/* Free all resources held by a thread. */ +extern inline void release_thread(struct task_struct *dead_task) +{ +} + +extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); + +/* Free current thread data structures etc. */ +static inline void exit_thread(void) +{ +} + +/* Return saved (kernel) PC of a blocked thread. */ +# define thread_saved_pc(tsk) \ + ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0) + +unsigned long get_wchan(struct task_struct *p); + +/* The size allocated for kernel stacks. This _must_ be a power of two! */ +# define KERNEL_STACK_SIZE 0x2000 + +/* Return some info about the user process TASK. */ +# define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE) +# define task_regs(task) ((struct pt_regs *)task_tos(task) - 1) + +# define task_pt_regs_plus_args(tsk) \ + (((void *)task_pt_regs(tsk)) - STATE_SAVE_ARG_SPACE) + +# define task_sp(task) (task_regs(task)->r1) +# define task_pc(task) (task_regs(task)->pc) +/* Grotty old names for some. */ +# define KSTK_EIP(task) (task_pc(task)) +# define KSTK_ESP(task) (task_sp(task)) + +/* FIXME */ +# define deactivate_mm(tsk, mm) do { } while (0) + +# define STACK_TOP TASK_SIZE +# define STACK_TOP_MAX STACK_TOP + +# endif /* __ASSEMBLY__ */ +# endif /* CONFIG_MMU */ #endif /* _ASM_MICROBLAZE_PROCESSOR_H */ |