powerpc/fsl_booke: make sure PAGE_OFFSET map to memstart_addr for relocatable kernel

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This is always true for a non-relocatable kernel. Otherwise the kernel
would get stuck. But for a relocatable kernel, it seems a little
complicated. When booting a relocatable kernel, we just align the
kernel start addr to 64M and map the PAGE_OFFSET from there. The
relocation will base on this virtual address. But if this address
is not the same as the memstart_addr, we will have to change the
map of PAGE_OFFSET to the real memstart_addr and do another relocation
again.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
[scottwood@freescale.com: make offset long and non-negative in simple case]
Signed-off-by: Scott Wood <scottwood@freescale.com>

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Kevin Hao 2013-12-24 15:12:10 +08:00 • committed by Scott Wood

parent 813125d833

commit 7d2471f9fa

3 changed files with 106 additions and 12 deletions

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74

arch/powerpc/kernel/head_fsl_booke.S

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42

arch/powerpc/mm/fsl_booke_mmu.c

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2

arch/powerpc/mm/mmu_decl.h

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