linuxÄں˿ռäÉêÇ볬¹ý2MBÁ¬Ðø¿Õ¼äµÄʵÏÖº¯Êý¡£
/*
kmalloc can apply 128KB memory only. This func support any continous memory allocate more than 2MB.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#define KMEM_PAGES //apply more than one page
#define KMEM_DEBUG //debug message switch
/*
// Pure 2^n version of get_order
static __inline__ __attribute_const__ int get_order(unsigned long size)
{
int order;
size = (size - 1) >> (PAGE_SHIFT - 1);
order = -1;
do {
size >>= 1;
order++;
} while (size);
return order;
}
*/
/*
alloc memory for DMA using in kernel space.
*/
void *kmem_alloc(size_t size, dma_addr_t *dma_handle, unsigned long flags)
{
struct page *page; //start page address
void *cpu_addr = NULL; //cpu io address
struct page *end; //end of pages
unsigned int PageOrder=0;
size = PAGE_ALIGN(size); //must be times of 4KB
PageOrder=get_order(size);
#ifdef CONFIG_ISOLATE_HIGHMEM //allocate in high memory
page = alloc_pages(GFP_HIGHUSER, PageOrder);
#else //allocate from low memory
page = alloc_pages(GFP_KERNEL, PageOrder); //get_order(size) means how many 4KB page do you want to apply. 2^n
#end
Ïà¹ØÎĵµ£º
£¨L2CAPÐÒé¼ò½é£¬L2CAPÔÚBlueZÖеÄʵÏÖÒÔ¼°L2CAP±à³Ì½Ó¿Ú£©
Ò»£ºL2CAPÐÒé¼ò½é£º
Logical Link Control and Adaptation Protocol(L2CAP)
Âß¼Á¬½Ó¿ØÖƺÍÊÊÅäÐÒé (L2CAP) ΪÉϲãÐÒéÌṩÃæÏòÁ¬½ÓºÍÎÞÁ¬½ÓµÄÊý¾Ý·þÎñ£¬²¢Ìṩ¶àÐÒ鹦ÄܺͷָîÖØ×é²Ù×÷¡£L2CAP ³äÐíÉϲãÐÒéºÍÓ¦ÓÃÈí¼þ´«ÊäºÍ½ÓÊÕ×î´ó³¤¶ÈΪ 64K µÄ L2CAP Ê ......
ShellÊÇϵͳµÄÓû§½çÃ棬ÌṩÁËÓû§ÓëÄں˽øÐн»»¥²Ù×÷µÄÒ»ÖÖ½Ó¿Ú¡£Ëü½ÓÊÕÓû§ÊäÈëµÄÃüÁî²¢°ÑËüËÍÈëÄÚºËÈ¥Ö´ÐС£
¡¡¡¡Êµ¼ÊÉÏShellÊÇÒ»¸öÃüÁî½âÊÍÆ÷£¬Ëü½âÊÍÓÉÓû§ÊäÈëµÄÃüÁî²¢ÇÒ°ÑËüÃÇË͵½Äںˡ£²»½öÈç´Ë£¬ShellÓÐ×Ô¼ºµÄ±à³ÌÓïÑÔÓÃÓÚ¶ÔÃüÁîµÄ±à¼£¬ËüÔÊÐíÓû§±àдÓÉshellÃüÁî×é³ÉµÄ³ÌÐò¡£Shell±à³ÌÓïÑÔ¾ßÓÐÆÕͨ±à³ÌÓ ......
inux±ØѧµÄ60¸öÃüÁî
LinuxÌṩÁË´óÁ¿µÄÃüÁÀûÓÃËü¿ÉÒÔÓÐЧµØÍê³É´óÁ¿µÄ¹¤×÷£¬Èç´ÅÅ̲Ù×÷¡¢Îļþ´æÈ¡¡¢Ä¿Â¼²Ù×÷¡¢½ø³Ì¹ÜÀí¡¢ÎļþȨÏÞÉ趨µÈ¡£ËùÒÔ£¬ÔÚLinuxϵͳÉϹ¤×÷Àë²»¿ªÊ¹ÓÃϵͳÌṩµÄÃüÁî¡£ÒªÏëÕæÕýÀí½âLinuxϵͳ£¬¾Í±ØÐë´ÓLinuxÃüÁîѧÆð£¬Í¨¹ý»ù´¡µÄÃüÁîѧϰ¿ÉÒÔ½øÒ»²½Àí½âLinuxϵͳ¡£
²»Í¬Linux·¢ÐаæµÄÃüÁîÊýÁ¿² ......
Î壺kmem_cache_create£¨£©·ÖÎö
ÎÒÃÇÒÔÒ»¸öÀý×ÓÀ´¸ú×Ù·ÖÎöÒ»ÏÂslabµÄ»úÖÆ£º
ÏÂÃæÊÇÒ»¸ö²âÊÔÄ£¿éµÄ´úÂ룺
#include <linux/config.h>
#include <linux/module.h>
#include <linux/slab.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("ericxiao <xgr178@163.com>");
MODULE_DESCRI ......
Linux ÏÂÃæʹÓÃRPCÐèҪʹÓõ½ÃüÁîrpcgen.
ÔÚLinuxÏ¿ª·¢RPC³ÌÐòÁ÷³ÌÈçÏ£º
1.дһ¸örpc³ÌÐò£¬
Èçtest.x
2.ʹÓÃrpcgenÉú³É±ØÐëµÄÎļþ£¬Í¨³£ÊÇ¿Í»§¶ËºÍ·þÎñÆ÷¶ËÒÔ¼°Í·Îļþ
$rpcgen test.x
3.ʹÓÃrpcgenÉú³É·þÎñÆ÷¶ËºÍ¿Í»§¶ËµÄCÓïÑÔ´úÂë
&n ......