71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
#ifndef __ASM_CRIS_ARCH_PROCESSOR_H
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#define __ASM_CRIS_ARCH_PROCESSOR_H
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({void *pc; __asm__ ("move.d $pc,%0" : "=rm" (pc)); pc; })
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/* CRIS has no problems with write protection */
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#define wp_works_ok 1
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/* CRIS thread_struct. this really has nothing to do with the processor itself, since
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* CRIS does not do any hardware task-switching, but it's here for legacy reasons.
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* The thread_struct here is used when task-switching using _resume defined in entry.S.
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* The offsets here are hardcoded into _resume - if you change this struct, you need to
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* change them as well!!!
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*/
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struct thread_struct {
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unsigned long ksp; /* kernel stack pointer */
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unsigned long usp; /* user stack pointer */
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unsigned long dccr; /* saved flag register */
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};
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/*
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* User space process size. This is hardcoded into a few places,
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* so don't change it unless you know what you are doing.
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*/
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#ifdef CONFIG_CRIS_LOW_MAP
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#define TASK_SIZE (0x50000000UL) /* 1.25 GB */
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#else
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#define TASK_SIZE (0xA0000000UL) /* 2.56 GB */
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#endif
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#define INIT_THREAD { \
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0, 0, 0x20 } /* ccr = int enable, nothing else */
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#define KSTK_EIP(tsk) \
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({ \
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unsigned long eip = 0; \
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unsigned long regs = (unsigned long)task_pt_regs(tsk); \
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if (regs > PAGE_SIZE && \
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virt_addr_valid(regs)) \
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eip = ((struct pt_regs *)regs)->irp; \
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eip; \
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})
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/* give the thread a program location
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* set user-mode (The 'U' flag (User mode flag) is CCR/DCCR bit 8)
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* switch user-stackpointer
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*/
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#define start_thread(regs, ip, usp) do { \
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set_fs(USER_DS); \
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regs->irp = ip; \
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regs->dccr |= 1 << U_DCCR_BITNR; \
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wrusp(usp); \
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} while(0)
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/* Called when handling a kernel bus fault fixup.
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*
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* After a fixup we do not want to return by restoring the CPU-state
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* anymore, so switch frame-types (see ptrace.h)
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*/
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#define arch_fixup(regs) \
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regs->frametype = CRIS_FRAME_NORMAL;
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#endif
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