compressed/head.s __setup_mmu

轉載地址：https://blog.csdn.net/coldsnow33/article/details/37904799 __setup_mmu: sub r3, r4, #16384 @ Page directory size,r3 = 0x20004000 bic r3, r3, #0xff @ Align the pointer bic r3, r3, #0x3f00 @ 這裏r4中存放

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