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60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#ifndef _ASM_CRIS_ARCH_PROCESSOR_H
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#define _ASM_CRIS_ARCH_PROCESSOR_H
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/* Return current instruction pointer. */
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#define current_text_addr() \
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({void *pc; __asm__ __volatile__ ("lapcq .,%0" : "=rm" (pc)); pc;})
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/*
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* Since CRIS doesn't do hardware task-switching this hasn't really anything to
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* do with the proccessor itself, it's just here for legacy reasons. This is
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* used when task-switching using _resume defined in entry.S. The offsets here
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* are hardcoded into _resume, so if this struct is changed, entry.S needs to be
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* changed 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 ccs; /* Saved flags register. */
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};
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/*
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* User-space process size. This is hardcoded into a few places, so don't
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* changed it unless everything's clear!
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*/
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#ifndef CONFIG_ETRAXFS_SIM
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#define TASK_SIZE (0xB0000000UL)
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#else
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#define TASK_SIZE (0xA0000000UL)
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#endif
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/* CCS I=1, enable interrupts. */
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#define INIT_THREAD { 0, 0, (1 << I_CCS_BITNR) }
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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 && virt_addr_valid(regs)) \
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eip = ((struct pt_regs *)regs)->erp; \
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eip; \
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})
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/*
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* Give the thread a program location, set user-mode and switch user
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* stackpointer.
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*/
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#define start_thread(regs, ip, usp) \
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do { \
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set_fs(USER_DS); \
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regs->erp = ip; \
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regs->ccs |= 1 << (U_CCS_BITNR + CCS_SHIFT); \
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wrusp(usp); \
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} while(0)
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/* Nothing special to do for v32 when handling a kernel bus fault fixup. */
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#define arch_fixup(regs) {};
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#endif /* _ASM_CRIS_ARCH_PROCESSOR_H */
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