[U-Boot-Users] what's the function jumptable_init() doing?

hi,all:

In the dir lib_arm\Board.c,I don't know the function of jumptable_init() function?who can help me,thanks!

in the func jumptable_init(void),

gd->jt[XF_get_version] = (void *) get_version; gd->jt[XF_malloc] = (void *) malloc; gd->jt[XF_free] = (void *) free; gd->jt[XF_get_timer] = (void *)get_timer; gd->jt[XF_udelay] = (void *)udelay;

I can't find where's XF_get_version,XF_malloc defined?

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