mm0_core.c
来自「澳洲人写的Cortex,包括uC_IP协议栈」· C语言 代码 · 共 147 行
C
147 行
<HTML><HEAD><TITLE>/home/asysweb/public_html/cortex/kernel/src/mm0_core.c</TITLE></HEAD><BODY><pre><font color="#6920ac">/*************************************************************************/</font><font color="#6920ac">/* */</font><font color="#6920ac">/* Copyright (c) 1997-1999 Australian Real Time Embedded Systems */</font><font color="#6920ac">/* */</font><font color="#6920ac">/* PROPRIETARY RIGHTS of Australian Real Time Embedded Systems */</font><font color="#6920ac">/* are involved in the subject matter of this material. All reproduction,*/</font><font color="#6920ac">/* manufacturing, use, and sales rights pertaining to this subject matter*/</font><font color="#6920ac">/* are governed by the license agreement. The recipient of this software */</font><font color="#6920ac">/* implicitly accepts the terms of the license. */</font><font color="#6920ac">/* */</font><font color="#6920ac">/*************************************************************************/</font><b><font color='DarkGreen'>#include</font></b> <a href="mm0_priv.h.FIND-INC"><font color="blue">"mm0_priv.h"</font></a><font size="+1"><i>crtx_Bool_t</i> <b><font color="azure1"><a name="mem0_Create">mem0_Create</a></font></b>(<i>crtx_Void_t</i> *Addr_a, <i>dmem_Size_t</i> Size_a, <i>crtx_Void_t</i> *pContext_a __attribute__((unused))){</font> <font color="#6920ac">/* descriptor of a segment consists of: */</font> <font color="#6920ac">/* 0 - dmem_Size_t rest of free memory */</font> <font color="#6920ac">/* 1 - dmem_Size_t, current number of byte to distribute */</font> <i>mem0_SegmHead_t</i> *segm; segm = (<i>mem0_SegmHead_t</i> *)pContext_a; <b>if</b> (segm == <a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>) <b>return</b>(<a href="CRTX_FALSE.FIND-DEF">CRTX_FALSE</a>); <font color="#6920ac">/* check for segment address alignment */</font> <a href="DMEM_ASSERT.FIND-DEF">DMEM_ASSERT</a>(((<i>dmem_Size_t</i>)Addr_a & (~(-<a href="DMEM_MIN_ALIGN.FIND-DEF">DMEM_MIN_ALIGN</a>))) == 0); <b>if</b> (!(((<i>dmem_Size_t</i>)Addr_a & (~(-<a href="DMEM_MIN_ALIGN.FIND-DEF">DMEM_MIN_ALIGN</a>))) == 0)) <b>return</b>(<a href="CRTX_FALSE.FIND-DEF">CRTX_FALSE</a>); segm->shift = 0; segm->rest = Size_a; <a href="rrlc_Create.FIND-FUNC">rrlc_Create</a>(&segm->lock,(<i>void</i> *)0); <b>return</b>(<a href="CRTX_TRUE.FIND-DEF">CRTX_TRUE</a>);}<font size="+1"><i>crtx_Void_t</i> <b><font color="azure1"><a name="mem0_Free">mem0_Free</a></font></b>(<i>crtx_Void_t</i> *Segm_a __attribute__((__unused__)), <i>crtx_Void_t</i> *pContext_a __attribute__((unused)), <i>crtx_Void_t</i> *Addr_a __attribute__((__unused__)), <i>dmem_Size_t</i> Size_a __attribute__((__unused__))){</font> <font color="#6920ac">/* empty function */</font> <a href="DMEM_ASSERT.FIND-DEF">DMEM_ASSERT</a>(0); <b>return</b>;}<font color="#6920ac">/* adjust address in according to alignment */</font><font size="+1"><i>static</i> <i>crtx_Uint16_t</i> <b><font color="azure1"><a name="CalcAlgn0">CalcAlgn0</a></font></b>(<i>crtx_Void_t</i> *Addr_a, <i>crtx_Uint16_t</i> Algn_a){</font> <i>crtx_Uint16_t</i> Resalgn; <i>dmem_Size_t</i> longad; longad = (<i>dmem_Size_t</i>)Addr_a; Resalgn = (Algn_a==0) ? 0 : (<i>crtx_Uint16_t</i>)(longad & (~(-(<i>long</i>)Algn_a))); <b>return</b>(Resalgn);}<font size="+1"><i>static</i> <i>crtx_Void_t</i> * <b><font color="azure1"><a name="mem0_DoAlloc">mem0_DoAlloc</a></font></b>(<i>mem0_SegmHead_t</i> *pDesc_a, <i>crtx_Void_t</i> *Addr_a, <i>dmem_Size_t</i> Size_a, <i>crtx_Uint16_t</i> Algn_a, <i>crtx_Bool_t</i> Locate_a){</font> <i>crtx_Void_t</i> *Result = <a href="DMEM_NULL.FIND-DEF">DMEM_NULL</a>; <i>dmem_Size_t</i> algndelt; <a href="DMEM_ASSERT.FIND-DEF">DMEM_ASSERT</a>((((-Algn_a)&Algn_a)==Algn_a)); <a href="rrlc_Lock.FIND-FUNC">rrlc_Lock</a>(&pDesc_a->lock); <b>if</b> ( !Locate_a ) { algndelt = ( Algn_a - <a href="#CalcAlgn0">CalcAlgn0</a>((<i>crtx_Void_t</i> *)&((<i>crtx_Char_t</i> *)Addr_a)[ pDesc_a->shift], Algn_a)) & (Algn_a - 1); <b>if</b> (pDesc_a->rest >= Size_a+algndelt) { Result = (<i>crtx_Void_t</i> *)&((<i>crtx_Char_t</i> *)Addr_a)[pDesc_a->shift + algndelt]; pDesc_a->rest -= Size_a+algndelt; pDesc_a->shift += Size_a+algndelt; } } <b>else</b> { <font color="#6920ac">/* allocating of memory for large block from the end of the segment*/</font> algndelt = <a href="#CalcAlgn0">CalcAlgn0</a>((<i>crtx_Void_t</i> *)&((<i>crtx_Char_t</i> *)Addr_a)[ pDesc_a->shift + pDesc_a->rest-Size_a],Algn_a); <b>if</b> (pDesc_a->rest>=Size_a+algndelt) { Result=(<i>crtx_Void_t</i> *)&((<i>crtx_Char_t</i> *)Addr_a)[ pDesc_a->shift + pDesc_a->rest-Size_a - algndelt]; pDesc_a->rest -= Size_a+algndelt; } } <a href="rrlc_Unlock.FIND-FUNC">rrlc_Unlock</a>(&pDesc_a->lock); <b>return</b>(Result);}<font size="+1"><i>crtx_Void_t</i> * <b><font color="azure1"><a name="mem0_Alloc">mem0_Alloc</a></font></b>(<i>crtx_Void_t</i> *Sgadd_a, <i>crtx_Void_t</i> *pContext_a __attribute__((unused)), <i>dmem_Size_t</i> Size_a, <i>crtx_Uint16_t</i> Algn_a){</font> <b>return</b>(<a href="#mem0_DoAlloc">mem0_DoAlloc</a>((<i>mem0_SegmHead_t</i> *)pContext_a, Sgadd_a, Size_a, Algn_a, <a href="CRTX_FALSE.FIND-DEF">CRTX_FALSE</a>));}<font size="+1"><i>crtx_Void_t</i> * <b><font color="azure1"><a name="mem0_AllocSt">mem0_AllocSt</a></font></b>(<i>crtx_Void_t</i> *Sgadd_a, <i>crtx_Void_t</i> *pContext_a __attribute__((unused)), <i>dmem_Size_t</i> Size_a, <i>crtx_Uint16_t</i> Algn_a){</font> <b>return</b>(<a href="#mem0_DoAlloc">mem0_DoAlloc</a>((<i>mem0_SegmHead_t</i> *)pContext_a, Sgadd_a, Size_a, Algn_a, <a href="CRTX_TRUE.FIND-DEF">CRTX_TRUE</a>));}<font color="#6920ac">/* returns pointer on input structure info if ok and DMEM_NULL otherwise */</font><font size="+1"><i>dmem_SegmInfo_t</i> * <b><font color="azure1"><a name="mem0_Info">mem0_Info</a></font></b>(<i>crtx_Void_t</i> *Sgadd_a __attribute__((unused)), <i>crtx_Void_t</i> *pContext_a __attribute__((unused)), <i>dmem_SegmInfo_t</i> *pInfo_a){</font> <i>mem0_SegmHead_t</i> *segm; segm = (<i>mem0_SegmHead_t</i> *) pContext_a; <a href="rrlc_Lock.FIND-FUNC">rrlc_Lock</a>(&segm->lock); <b>if</b> (pInfo_a != <a href="DMEM_NULL.FIND-DEF">DMEM_NULL</a>) { pInfo_a->Used = segm->shift ; pInfo_a->Max = pInfo_a->Free = segm->rest; pInfo_a->Size = pInfo_a->Free + pInfo_a->Used; } <a href="rrlc_Unlock.FIND-FUNC">rrlc_Unlock</a>(&segm->lock); <b>return</b>(pInfo_a);}</pre></BODY></HTML>⌨️ 快捷键说明
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