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https://github.com/drasko/codezero.git
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40e088b042
- Added a full ipc send/recv test - Removed non-zero value checking in r2 for ipc that was there to catch inadvertent full ipc calls. - Added correct hanlding for read/write mrs for current status of utcb. TODO: - Add mapping of every utcb to every task for privileged access so that the kernel can access every utcb without switching spaces. - Removal of same mappings - Upon thread creation need to copy page tables accordingly i.e. each task will have its own utcb mapped with USER access, but every other utcb as kernel access only. Need to handle this case upon page table copying.
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[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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