From dd189692d40948d6445bbaeb8cb9bf9d15f54dc6 Mon Sep 17 00:00:00 2001 From: Kevin Hao Date: Tue, 24 Dec 2013 15:12:06 +0800 Subject: powerpc: enable the relocatable support for the fsl booke 32bit kernel This is based on the codes in the head_44x.S. The difference is that the init tlb size we used is 64M. With this patch we can only load the kernel at address between memstart_addr ~ memstart_addr + 64M. We will fix this restriction in the following patches. Signed-off-by: Kevin Hao Signed-off-by: Scott Wood --- arch/powerpc/mm/fsl_booke_mmu.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'arch/powerpc/mm/fsl_booke_mmu.c') diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c index 07ba45b0f07c..ce4a1163ddd3 100644 --- a/arch/powerpc/mm/fsl_booke_mmu.c +++ b/arch/powerpc/mm/fsl_booke_mmu.c @@ -241,4 +241,32 @@ void setup_initial_memory_limit(phys_addr_t first_memblock_base, /* 64M mapped initially according to head_fsl_booke.S */ memblock_set_current_limit(min_t(u64, limit, 0x04000000)); } + +#ifdef CONFIG_RELOCATABLE +notrace void __init relocate_init(phys_addr_t start) +{ + unsigned long base = KERNELBASE; + + /* + * Relocatable kernel support based on processing of dynamic + * relocation entries. + * Compute the virt_phys_offset : + * virt_phys_offset = stext.run - kernstart_addr + * + * stext.run = (KERNELBASE & ~0x3ffffff) + (kernstart_addr & 0x3ffffff) + * When we relocate, we have : + * + * (kernstart_addr & 0x3ffffff) = (stext.run & 0x3ffffff) + * + * hence: + * virt_phys_offset = (KERNELBASE & ~0x3ffffff) - + * (kernstart_addr & ~0x3ffffff) + * + */ + kernstart_addr = start; + start &= ~0x3ffffff; + base &= ~0x3ffffff; + virt_phys_offset = base - start; +} +#endif #endif -- cgit v1.2.3