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Diffstat (limited to 'include/asm-cris/processor.h')
-rw-r--r-- | include/asm-cris/processor.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/include/asm-cris/processor.h b/include/asm-cris/processor.h new file mode 100644 index 000000000..5df5e26a4 --- /dev/null +++ b/include/asm-cris/processor.h @@ -0,0 +1,147 @@ +/* + * include/asm-cris/processor.h + * + * Copyright (C) 2000 Axis Communications AB + * + * Authors: Bjorn Wesen Initial version + * + */ + +#ifndef __ASM_CRIS_PROCESSOR_H +#define __ASM_CRIS_PROCESSOR_H + +#include <linux/config.h> +#include <asm/system.h> +#include <asm/ptrace.h> + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + */ +#define current_text_addr() ({ __label__ _l; _l: &&_l;}) + +/* CRIS has no problems with write protection */ + +#define wp_works_ok 1 + +/* + * User space process size. This is hardcoded into a few places, + * so don't change it unless you know what you are doing. + */ + +#ifdef CONFIG_CRIS_LOW_MAP +#define TASK_SIZE (0x50000000UL) /* 1.25 GB */ +#else +#define TASK_SIZE (0xB0000000UL) /* 2.75 GB */ +#endif + +/* This decides where the kernel will search for a free chunk of vm + * space during mmap's. + */ +#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) + +/* CRIS thread_struct. this really has nothing to do with the processor itself, since + * CRIS does not do any hardware task-switching, but it's here for legacy reasons. + * The thread_struct here is used when task-switching using _resume defined in entry.S. + * The offsets here are hardcoded into _resume - if you change this struct, you need to + * change them as well!!! +*/ + +struct thread_struct { + unsigned long ksp; /* kernel stack pointer */ + unsigned long usp; /* user stack pointer */ + unsigned long esp0; /* points to start of saved stack frame, set in entry.S */ + unsigned long dccr; /* saved flag register */ +}; + +/* saved stack-frame upon syscall entry, points to registers */ + +#define current_regs() (current->thread.esp0) + +/* this lives in process.c */ +asmlinkage void set_esp0(unsigned long ssp); + +/* INIT_MMAP is the kernels map of memory, between KSEG_C and KSEG_D */ + +#ifdef CONFIG_CRIS_LOW_MAP +#define INIT_MMAP { &init_mm, KSEG_6, KSEG_7, NULL, PAGE_SHARED, \ + VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL } +#else +#define INIT_MMAP { &init_mm, KSEG_C, KSEG_D, NULL, PAGE_SHARED, \ + VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL } +#endif + +#define INIT_THREAD { \ + 0, 0, 0, 0x20 } /* ccr = int enable, nothing else */ + +/* TODO: REMOVE */ +#define alloc_kernel_stack() __get_free_page(GFP_KERNEL) +#define free_kernel_stack(page) free_page((page)) + +extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); + +/* give the thread a program location + * set user-mode (The 'U' flag (User mode flag) is CCR/DCCR bit 8) + * switch user-stackpointer + */ + +#define start_thread(regs, ip, usp) do { \ + set_fs(USER_DS); \ + regs->irp = ip; \ + regs->dccr |= 1 << 8; \ + wrusp(usp); \ +} while(0) + +unsigned long get_wchan(struct task_struct *p); + +#define KSTK_EIP(tsk) \ + ({ \ + unsigned long eip = 0; \ + if ((tsk)->thread.esp0 > PAGE_SIZE && \ + VALID_PAGE(virt_to_page((tsk)->thread.esp0))) \ + eip = ((struct pt_regs *) (tsk)->thread.esp0)->irp; \ + eip; }) + +#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) + +#define copy_segments(tsk, mm) do { } while (0) +#define release_segments(mm) do { } while (0) +#define forget_segments() do { } while (0) + +/* + * Free current thread data structures etc.. + */ + +static inline void exit_thread(void) +{ +} + +/* Free all resources held by a thread. */ +static inline void release_thread(struct task_struct *dead_task) +{ +} + +/* + * Return saved PC of a blocked thread. + */ +extern inline unsigned long thread_saved_pc(struct thread_struct *t) +{ + return (unsigned long)((struct pt_regs *)t->esp0)->irp; +} + +/* THREAD_SIZE is the size of the task_struct/kernel_stack combo. + * normally, the stack is found by doing something like p + THREAD_SIZE + * in CRIS, a page is 8192 bytes, which seems like a sane size + */ + +#define THREAD_SIZE PAGE_SIZE +#define KERNEL_STACK_SIZE PAGE_SIZE + +#define alloc_task_struct() ((struct task_struct *) __get_free_pages(GFP_KERNEL,1)) +#define free_task_struct(p) free_pages((unsigned long) (p), 1) +#define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count) + +#define init_task (init_task_union.task) +#define init_stack (init_task_union.stack) + +#endif /* __ASM_CRIS_PROCESSOR_H */ |