On 07/04/2013 07:54:10 AM, Kevin Hao wrote:
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 256M or set
CONFIG_KERNEL_START above 256M. So we choose to switch to address
space 1 before setting these tlb entries.
If you're doing this, then I see even less reason to use such a large
boot TLB1 entry.
Signed-off-by: Kevin Hao <haoke...@gmail.com>
---
A new patch in v2.
arch/powerpc/kernel/head_fsl_booke.S | 81
++++++++++++++++++++++++++++++++++++
arch/powerpc/mm/fsl_booke_mmu.c | 2 +
arch/powerpc/mm/mmu_decl.h | 2 +
3 files changed, 85 insertions(+)
diff --git a/arch/powerpc/kernel/head_fsl_booke.S
b/arch/powerpc/kernel/head_fsl_booke.S
index 134064d..0cbfe95 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -1172,6 +1172,87 @@ __secondary_hold_acknowledge:
#endif
/*
+ * Create a tbl entry
s/tbl/tlb/
diff --git a/arch/powerpc/mm/fsl_booke_mmu.c
b/arch/powerpc/mm/fsl_booke_mmu.c
index 5fe271c..8f60ef8 100644
--- a/arch/powerpc/mm/fsl_booke_mmu.c
+++ b/arch/powerpc/mm/fsl_booke_mmu.c
@@ -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);
Wouldn't it be simpler to just run out of AS1 from the end of
fsl_booke_entry_mapping.S, similar to what U-Boot does? With ESEL
being changed to something non-conflicting, of course.
-Scott
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