353 lines
6.7 KiB
C
353 lines
6.7 KiB
C
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#include "stdint.h"
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#include "string.h"
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#include "rtthread.h"
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#include "board.h"
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#include "debug.h"
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typedef struct
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{
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uint8_t *membase; // 内存池
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uint8_t memrdy; // 内存管理是否就绪
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uint16_t *memmap; // 内存管理状态表
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// 内存管理参数
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uint32_t memtblsize ; // 内存表大小
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uint32_t memblksize; // 内存分块大小
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uint32_t memsize ; // 内存总大小
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void *mutex;
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}mallco_dev;
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#define SRAM_USER_SIZE (80*1024)
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#define MEM_BLOCK_SIZE (32)
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#define MEM_MAX_SIZE (((SRAM_USER_SIZE))*MEM_BLOCK_SIZE/(MEM_BLOCK_SIZE+2))
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#define MEM_ALLOC_TABLE_SIZE ((MEM_MAX_SIZE/MEM_BLOCK_SIZE)&(~3))
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#define SRAM_USER_ADDR ((uint32_t)g_sram_mem)
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//分配的内存都是双字对齐的
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#define MEM_BASE ((uint8_t *)(SRAM_USER_ADDR+MEM_ALLOC_TABLE_SIZE*2))
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#define MEMMAP_BASE ((uint16_t *)(SRAM_USER_ADDR))
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static uint8_t g_sram_mem[SRAM_USER_SIZE];
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//内存管理控制器
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static mallco_dev g_self;
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//内存管理初始化
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void mem_init(void)
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{
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mallco_dev *self=&g_self;
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if(self->memrdy) return;
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self->memtblsize = MEM_ALLOC_TABLE_SIZE;
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self->memblksize = MEM_BLOCK_SIZE;
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self->memsize = MEM_MAX_SIZE;
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self->membase=MEM_BASE;
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self->memmap=MEMMAP_BASE;
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memset(self->memmap, 0,self->memtblsize*2);
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memset(self->membase, 0,self->memsize);
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self->mutex=rt_mutex_create("mem",RT_IPC_FLAG_FIFO);
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self->memrdy=1;
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}
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// 获取内存使用率
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// 返回值:使用率(0~100)
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int mem_perused(void)
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{
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mallco_dev *self=&g_self;
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uint32_t used=0;
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uint32_t i;
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for(i=0;i<self->memtblsize;i++)
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{
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if(self->memmap[i])used++;
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}
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//return (used*100)/(self->memtblsize);
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return used;
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}
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// 内存分配(内部调用)
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// size:要分配的内存大小(字节)
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// 返回值:0XFFFFFFFF,代表错误;其他,内存偏移地址
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static uint32_t mem_malloc(uint32_t size)
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{
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mallco_dev *self=&g_self;
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signed long offset=0;
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uint16_t nmemb;
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uint16_t cmemb=0;
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uint32_t i;
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uint32_t ret=0xffffffff;
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if(size==0)return ret;
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rt_mutex_take(self->mutex,RT_WAITING_FOREVER);
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nmemb=size/self->memblksize;
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if(size%self->memblksize)nmemb++;
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for(offset=self->memtblsize-1;offset>=0;offset--)
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{
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if(!self->memmap[offset])cmemb++;
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else cmemb=0;
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if(cmemb==nmemb)
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{
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for(i=0;i<nmemb;i++)
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{
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self->memmap[offset+i]=nmemb;
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}
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ret= (offset*self->memblksize);
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break;
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}
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}
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rt_mutex_release(self->mutex);
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return ret;
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}
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//释放内存(内部调用)
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//offset:内存地址偏移
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//返回值:0,释放成功;1,释放失败;
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static int mem_free(uint32_t offset)
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{
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mallco_dev *self=&g_self;
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int i;
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int ret=1;
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rt_mutex_take(self->mutex,RT_WAITING_FOREVER);
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if(offset<self->memsize)
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{
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int index=offset/self->memblksize;
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int nmemb=self->memmap[index];
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for(i=0;i<nmemb;i++)
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{
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self->memmap[index+i]=0;
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}
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ret= 0;
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}
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rt_mutex_release(self->mutex);
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return ret;
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}
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void *malloc(uint32_t size)
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{
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mallco_dev *self=&g_self;
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uint32_t offset;
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void *ret_addr=NULL;
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offset=mem_malloc(size);
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if (offset!=0XFFFFFFFF)
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{
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ret_addr=(void*)((uint32_t)self->membase+offset);
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}
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return ret_addr;
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}
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static void self_free(void *ptr)
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{
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mallco_dev *self=&g_self;
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uint32_t offset;
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if(ptr==NULL)
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{
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return;
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}
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else
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{
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offset=(uint32_t)ptr-(uint32_t)self->membase;
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mem_free(offset);
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}
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}
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void *calloc(size_t nmemb, size_t size)
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{
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void *p;
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p=malloc(nmemb*size);
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if(p) memset(p,0,size);
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return p;
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}
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void *realloc(void *p,size_t size)
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{
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param_check(0);
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return NULL;
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}
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#define MEM_TEMP_PTR_NUM 400
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typedef void (*del_fun_def)(void *t);
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typedef struct{
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void *temp_ptr[MEM_TEMP_PTR_NUM];
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void *del_ptr[MEM_TEMP_PTR_NUM];
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int used;
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uint32_t bitmap[(MEM_TEMP_PTR_NUM+31)/32];
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void *mutex;
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}temp_def;
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static temp_def g_tempptr;
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// 在位图中找到一个0/1
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static int bitmap_find(uint32_t *bitmap,int num,int bit)
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{
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for(int i=0;i<num;i++)
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{
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if((bitmap[i/32]&(1<<(i%32)))==(bit<<(i%32)))
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{
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return i;
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}
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}
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return -1;
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}
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// 设置位图中指定位
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static void bitmap_set(uint32_t *bitmap,int index)
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{
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bitmap[index/32]|=1<<(index%32);
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}
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static void bitmap_clear(uint32_t *bitmap,int index)
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{
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bitmap[index/32]&=~(1<<(index%32));
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}
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static int bitmap_get(uint32_t *bitmap,int index)
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{
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return (bitmap[index/32]&(1<<(index%32)))==(1<<(index%32));
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}
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static void *tempptr_append(temp_def *t,void *p,void *del_fun)
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{
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if(p==NULL) return p;
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void *ret=NULL;
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if(del_fun==0) del_fun=self_free;
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if(t->used<MEM_TEMP_PTR_NUM)
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{
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int index=bitmap_find(t->bitmap,MEM_TEMP_PTR_NUM,0);
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param_check(index>=0);
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t->temp_ptr[index]=p;
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t->del_ptr[index]=del_fun;
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bitmap_set(t->bitmap,index);
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ret= p;
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t->used++;
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}
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else{
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param_check(0);
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}
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if(ret==NULL) ((del_fun_def)del_fun)(p);
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return ret;
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}
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// 查询指针是否已存在
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static int tempptr_find(temp_def *t,void *p)
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{
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int index;
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for(int i=0;i<MEM_TEMP_PTR_NUM;i++)
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{
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if(bitmap_get(t->bitmap,i))
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{
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if(t->temp_ptr[i]==p)
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{
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return 1;
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}
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}
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}
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return 0;
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}
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static void tempptr_free(void)
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{
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int index;
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void *p=NULL;
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del_fun_def del=NULL;
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temp_def *t=&g_tempptr;
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rt_mutex_take(t->mutex,RT_WAITING_FOREVER);
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if(index=bitmap_find(t->bitmap,MEM_TEMP_PTR_NUM,1),index>=0)
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{
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// DBG_LOG("%s:free tempptr",__func__);
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p=t->temp_ptr[index];
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t->temp_ptr[index]=0;
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del=(del_fun_def)t->del_ptr[index];
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bitmap_clear(t->bitmap,index);
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t->used--;
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}
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rt_mutex_release(t->mutex);
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if(del) del(p);
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}
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void tempptr_init(void)
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{
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temp_def *t=&g_tempptr;
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t->mutex=rt_mutex_create("tempptr",RT_IPC_FLAG_FIFO);
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rt_thread_idle_sethook(tempptr_free);
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}
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// 申请临时内存,在任务结束后自动释放
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void *tmalloc(uint32_t size)
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{
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void *p;
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temp_def *t=&g_tempptr;
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p=malloc(size);
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rt_mutex_take(t->mutex,RT_WAITING_FOREVER);
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p=tempptr_append(&g_tempptr,p,NULL);
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rt_mutex_release(t->mutex);
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return p;
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}
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// 把指针添加为临时指针
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void *tappend(void *p,void *del)
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{
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mallco_dev *self=&g_self;
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temp_def *t=&g_tempptr;
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void *ret=NULL;
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rt_mutex_take(t->mutex,RT_WAITING_FOREVER);
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if(((uint32_t)p>=(uint32_t)self->membase)&&
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((uint32_t)p<(uint32_t)(self->membase+self->memsize)))
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{
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if(tempptr_find(t,p)==0)
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{
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ret= tempptr_append(t,p,del);
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}
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}
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rt_mutex_release(t->mutex);
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return ret;
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}
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// 释放内存，如果在临时表中则退出
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void free(void *p)
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{
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if(p==NULL) return;
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mallco_dev *self=&g_self;
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temp_def *t=&g_tempptr;
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int ret=0;
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rt_mutex_take(t->mutex,RT_WAITING_FOREVER);
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ret=tempptr_find(t,p);
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rt_mutex_release(t->mutex);
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if(ret){
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return;
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}else{
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self_free(p);
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}
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}
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