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powerpc/fsl_booke: set the tlb entry for the kernel address in AS1

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We use the tlb1 entries to map low mem to the kernel space. In the
current code, it assumes that the first tlb entry would cover the
kernel image. But this is not true for some special cases, such as
when we run a relocatable kernel above the 64M or set
CONFIG_KERNEL_START above 64M. So we choose to switch to address
space 1 before setting these tlb entries.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Kevin Hao
2013-12-24 15:12:07 +08:00
committed by Scott Wood
parent dd189692d4
commit 78a235efdc
3 changed files with 85 additions and 0 deletions
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2
arch/powerpc/mm/fsl_booke_mmu.c
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@@ -222,7 +222,9 @@ void __init adjust_total_lowmem(void)
/* adjust lowmem size to __max_low_memory */
ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem);
i = switch_to_as1();
__max_low_memory = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM);
restore_to_as0(i);
pr_info("Memory CAM mapping: ");
for (i = 0; i < tlbcam_index - 1; i++)