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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2010-04-04 22:19:03 +0200
committerKumar Gala <galak@kernel.crashing.org>2010-05-24 21:25:32 -0500
commitb3df895aebe091b1657a42a8c859bd49fc96646b (patch)
tree0ae6f069d0774960af631b7979f5cbbb697b2355 /arch/powerpc/kernel/fsl_booke_entry_mapping.S
parent7c08ce718fd04e373d7473918ae02f1c04d5d504 (diff)
downloadblackbird-op-linux-b3df895aebe091b1657a42a8c859bd49fc96646b.tar.gz
blackbird-op-linux-b3df895aebe091b1657a42a8c859bd49fc96646b.zip
powerpc/kexec: Add support for FSL-BookE
This adds support kexec on FSL-BookE where the MMU can not be simply switched off. The code borrows the initial MMU-setup code to create the identical mapping mapping. The only difference to the original boot code is the size of the mapping(s) and the executeable address. The kexec code maps the first 2 GiB of memory in 256 MiB steps. This should work also on e500v1 boxes. SMP support is still not available. (Kumar: Added minor change to build to ifdef CONFIG_PPC_STD_MMU_64 some code that was PPC64 specific) Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/fsl_booke_entry_mapping.S')
-rw-r--r--arch/powerpc/kernel/fsl_booke_entry_mapping.S37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/fsl_booke_entry_mapping.S b/arch/powerpc/kernel/fsl_booke_entry_mapping.S
index cdb1296f972d..beb4d78a2304 100644
--- a/arch/powerpc/kernel/fsl_booke_entry_mapping.S
+++ b/arch/powerpc/kernel/fsl_booke_entry_mapping.S
@@ -159,6 +159,8 @@ skpinv: addi r6,r6,1 /* Increment */
#define M_IF_SMP 0
#endif
+#if defined(ENTRY_MAPPING_BOOT_SETUP)
+
/* 6. Setup KERNELBASE mapping in TLB1[0] */
lis r6,0x1000 /* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */
mtspr SPRN_MAS0,r6
@@ -174,6 +176,41 @@ skpinv: addi r6,r6,1 /* Increment */
/* 7. Jump to KERNELBASE mapping */
lis r6,(KERNELBASE & ~0xfff)@h
ori r6,r6,(KERNELBASE & ~0xfff)@l
+
+#elif defined(ENTRY_MAPPING_KEXEC_SETUP)
+/*
+ * 6. Setup a 1:1 mapping in TLB1. Esel 0 is unsued, 1 or 2 contains the tmp
+ * mapping so we start at 3. We setup 8 mappings, each 256MiB in size. This
+ * will cover the first 2GiB of memory.
+ */
+
+ lis r10, (MAS1_VALID|MAS1_IPROT)@h
+ ori r10,r10, (MAS1_TSIZE(BOOK3E_PAGESZ_256M))@l
+ li r11, 0
+ li r0, 8
+ mtctr r0
+
+next_tlb_setup:
+ addi r0, r11, 3
+ rlwinm r0, r0, 16, 4, 15 // Compute esel
+ rlwinm r9, r11, 28, 0, 3 // Compute [ER]PN
+ oris r0, r0, (MAS0_TLBSEL(1))@h
+ mtspr SPRN_MAS0,r0
+ mtspr SPRN_MAS1,r10
+ mtspr SPRN_MAS2,r9
+ ori r9, r9, (MAS3_SX|MAS3_SW|MAS3_SR)
+ mtspr SPRN_MAS3,r9
+ tlbwe
+ addi r11, r11, 1
+ bdnz+ next_tlb_setup
+
+/* 7. Jump to our 1:1 mapping */
+ li r6, 0
+
+#else
+ #error You need to specify the mapping or not use this at all.
+#endif
+
lis r7,MSR_KERNEL@h
ori r7,r7,MSR_KERNEL@l
bl 1f /* Find our address */
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