diff options
Diffstat (limited to 'linux/arch/cris/include/arch-v32/arch/processor.h')
| -rw-r--r-- | linux/arch/cris/include/arch-v32/arch/processor.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/linux/arch/cris/include/arch-v32/arch/processor.h b/linux/arch/cris/include/arch-v32/arch/processor.h new file mode 100644 index 00000000..56875927 --- /dev/null +++ b/linux/arch/cris/include/arch-v32/arch/processor.h @@ -0,0 +1,53 @@ +#ifndef _ASM_CRIS_ARCH_PROCESSOR_H +#define _ASM_CRIS_ARCH_PROCESSOR_H + + +/* Return current instruction pointer. */ +#define current_text_addr() \ + ({void *pc; __asm__ __volatile__ ("lapcq .,%0" : "=rm" (pc)); pc;}) + +/* + * Since CRIS doesn't do hardware task-switching this hasn't really anything to + * do with the proccessor itself, it's just here for legacy reasons. This is + * used when task-switching using _resume defined in entry.S. The offsets here + * are hardcoded into _resume, so if this struct is changed, entry.S needs to be + * changed as well. + */ +struct thread_struct { + unsigned long ksp; /* Kernel stack pointer. */ + unsigned long usp; /* User stack pointer. */ + unsigned long ccs; /* Saved flags register. */ +}; + +/* + * User-space process size. This is hardcoded into a few places, so don't + * change it unless everything's clear! + */ +#define TASK_SIZE (0xB0000000UL) + +#define INIT_THREAD { } + +#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)->erp; \ + eip; \ +}) + +/* + * Give the thread a program location, set user-mode and switch user + * stackpointer. + */ +#define start_thread(regs, ip, usp) \ +do { \ + regs->erp = ip; \ + regs->ccs |= 1 << (U_CCS_BITNR + CCS_SHIFT); \ + wrusp(usp); \ +} while(0) + +/* Nothing special to do for v32 when handling a kernel bus fault fixup. */ +#define arch_fixup(regs) {}; + +#endif /* _ASM_CRIS_ARCH_PROCESSOR_H */ |