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1) ÔÚinit/main.cÕâ¸öÎļþÖÐ,ÔÚÕâÒ»¶Î´úÂë
#ifdef CONFIG_X86_LOCAL_APIC
#include <asm/smp.h>
#endif
µÄÏÂÃæÔö¼ÓÕâ¶Î´úÂë:
unsigned long max_normal_low_pfn=0;
EXPORT_SYMBOL(max_normal_low_pfn);
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2) arch/x86/kernel/setup.cÕâ¸öÎļþ£º
l ÔÚstruct boot_params boot_params;
#endifÖ®ºóÌí¼Ó£¬ÉùÃ÷¸Ã±äÁ¿ÒѾÔÚ±ðµÄÎļþÓж¨ÒåÁË
extern unsigned long max_normal_low_pfn;
l ÔÚsetup_arch()Õâ¸öº¯ÊýÖУ¬ÔÚfind_low_pfn_range()Õâ¸öÖ®ºó£¬Ôö¼ÓÕâÒ»¾ä£º
max_normal_low_pfn = max_low_pfn/2;
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3) ÔÚarch/x86/mm/init_32.cÎļþ
l ÔÚunsigned long max_low_pfn_mapped; unsigned long max_pfn_mapped;Ö®ºóÌí¼Óextern unsigned long max_normal_low_pfn;
l ÔÚstatic void __init zone_sizes_init(void)Õâ¸öº¯ÊýÖÐÔö¼ÓÕâ¾ä´ú
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struct leedriver
{
struct cdev cdev;
unsigned char mem[MEMSIZE];
};
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static int simple_remap_mmap(stru ......
pid_t pid=fork()
it has 3 situation for the return result pid
0 child
>0 parent process
<0 fork fail
fork create a new process and it parent live alse when the child process had been created ......
1¡¢Ö±½ÓÓÃexportÃüÁ
#export PATH=$PATH:×Ô¶¨Òå·¾¶
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[root@localhost bin]# export
PATH=$PATH:×Ô¶¨Òå·¾¶
2¡¢ÐÞ¸ÄprofileÎļþ£º
#vi /etc/profile
ÔÚÀïÃæ¼ÓÈë:
export PATH="$PATH:/opt/au1200_rm/build_tools/bin"
3. ÐÞ¸Ä.bashrcÎļþ£º
# vi /root/. ......
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