diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-11-01 09:51:51 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-11-01 09:51:51 -0700 |
commit | 0242909a6135e10a28822c64f9ad50fdad52757c (patch) | |
tree | c5f9c8abe95a65433e6ac356871f2379c02488fe /arch/cris/include/arch-v10/arch/processor.h | |
parent | 0a6d2fac615972142715d736289abeeb7382e81d (diff) | |
parent | 556dcee7b829e5c350c3ffdbdb87a8b15aa3c5d3 (diff) |
Merge branch 'cris_move' of git://www.jni.nu/cris
* 'cris_move' of git://www.jni.nu/cris:
[CRIS] Move header files from include to arch/cris/include.
[CRISv32] Remove warning in io.h
Diffstat (limited to 'arch/cris/include/arch-v10/arch/processor.h')
-rw-r--r-- | arch/cris/include/arch-v10/arch/processor.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/cris/include/arch-v10/arch/processor.h b/arch/cris/include/arch-v10/arch/processor.h new file mode 100644 index 00000000000..cc692c7a066 --- /dev/null +++ b/arch/cris/include/arch-v10/arch/processor.h @@ -0,0 +1,70 @@ +#ifndef __ASM_CRIS_ARCH_PROCESSOR_H +#define __ASM_CRIS_ARCH_PROCESSOR_H + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + */ +#define current_text_addr() ({void *pc; __asm__ ("move.d $pc,%0" : "=rm" (pc)); pc; }) + +/* CRIS has no problems with write protection */ +#define wp_works_ok 1 + +/* 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 dccr; /* saved flag register */ +}; + +/* + * 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 (0xA0000000UL) /* 2.56 GB */ +#endif + +#define INIT_THREAD { \ + 0, 0, 0x20 } /* ccr = int enable, nothing else */ + +#define KSTK_EIP(tsk) \ +({ \ + unsigned long eip = 0; \ + unsigned long regs = (unsigned long)task_pt_regs(tsk); \ + if (regs > PAGE_SIZE && \ + virt_addr_valid(regs)) \ + eip = ((struct pt_regs *)regs)->irp; \ + eip; \ +}) + +/* 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 << U_DCCR_BITNR; \ + wrusp(usp); \ +} while(0) + +/* Called when handling a kernel bus fault fixup. + * + * After a fixup we do not want to return by restoring the CPU-state + * anymore, so switch frame-types (see ptrace.h) + */ +#define arch_fixup(regs) \ + regs->frametype = CRIS_FRAME_NORMAL; + +#endif |