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https://github.com/drasko/codezero.git
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cb561ab262
Added UTCB functions for full ipc that copy buffer or string payloads in secondary message registers. Some posix syscalls now use these utcb functions to copy pathnames.
104 lines
2.4 KiB
C
104 lines
2.4 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 <l4/lib/math.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
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* (aka UTCB). First reference is to the KIP's utcb
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* offset, second is to the utcb itself, to which
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* the KIP's utcb reference had been updated during
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* context 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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static inline void *utcb_full_buffer()
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{
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return &l4_get_utcb()->mr_rest[0];
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}
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static inline char *utcb_full_strcpy_from(const char *src)
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{
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return strncpy((char *)&l4_get_utcb()->mr_rest[0], src,
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L4_UTCB_FULL_BUFFER_SIZE);
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}
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static inline void *utcb_full_memcpy_from(const char *src, int size)
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{
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return memcpy(&l4_get_utcb()->mr_rest[0], src,
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min(size, L4_UTCB_FULL_BUFFER_SIZE));
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}
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static inline char *utcb_full_strcpy_to(char *dst)
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{
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return strncpy(dst, (char *)&l4_get_utcb()->mr_rest[0],
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L4_UTCB_FULL_BUFFER_SIZE);
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}
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static inline void *utcb_full_memcpy_to(char *dst, int size)
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{
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return memcpy(dst, &l4_get_utcb()->mr_rest[0],
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min(size, L4_UTCB_FULL_BUFFER_SIZE));
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* __ARM_UTCB_H__ */
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