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72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/*
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* Copyright (C) 2009 Bahadir Bilgehan Balban
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*/
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#ifndef __ARM_UTCB_H__
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#define __ARM_UTCB_H__
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#define USER_UTCB_REF 0xFF000050
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#define L4_KIP_ADDRESS 0xFF000000
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#define UTCB_KIP_OFFSET 0x50
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#ifndef __ASSEMBLY__
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#include <l4lib/types.h>
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#include <l4/macros.h>
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#include INC_GLUE(message.h)
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#include INC_GLUE(memory.h)
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#include <string.h>
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#include <stdio.h>
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/* UTCB implementation */
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/*
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* NOTE: In syslib.h the first few mrs are used by data frequently
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* needed for all ipcs. Those mrs are defined the kernel message.h
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*/
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struct utcb {
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u32 mr[MR_TOTAL]; /* MRs that are mapped to real registers */
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u32 saved_tag; /* Saved tag field for stacked ipcs */
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u32 saved_sender; /* Saved sender field for stacked ipcs */
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u32 mr_rest[MR_REST]; /* Complete the utcb for up to 64 words */
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};
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extern struct kip *kip;
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/*
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* Pointer to Kernel Interface Page's UTCB pointer offset.
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*/
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extern struct utcb **kip_utcb_ref;
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static inline struct utcb *l4_get_utcb()
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{
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/*
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* By double dereferencing, we get the private TLS (aka UTCB). First
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* reference is to the KIP's utcb offset, second is to the utcb itself,
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* to which the KIP's utcb reference had been updated during context
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* switch.
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*/
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return *kip_utcb_ref;
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}
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/* Functions to read/write utcb registers */
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static inline unsigned int read_mr(int offset)
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{
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if (offset < MR_TOTAL)
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return l4_get_utcb()->mr[offset];
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else
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return l4_get_utcb()->mr_rest[offset - MR_TOTAL];
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}
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static inline void write_mr(unsigned int offset, unsigned int val)
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{
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if (offset < MR_TOTAL)
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l4_get_utcb()->mr[offset] = val;
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else
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l4_get_utcb()->mr_rest[offset - MR_TOTAL] = val;
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* __ARM_UTCB_H__ */
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