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-rw-r--r--arch/powerpc/kernel/cpu_setup_power7.S91
1 files changed, 91 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/cpu_setup_power7.S b/arch/powerpc/kernel/cpu_setup_power7.S
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+++ b/arch/powerpc/kernel/cpu_setup_power7.S
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+/*
+ * This file contains low level CPU setup functions.
+ * Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/cputable.h>
+#include <asm/ppc_asm.h>
+#include <asm/asm-offsets.h>
+#include <asm/cache.h>
+
+/* Entry: r3 = crap, r4 = ptr to cputable entry
+ *
+ * Note that we can be called twice for pseudo-PVRs
+ */
+_GLOBAL(__setup_cpu_power7)
+ mflr r11
+ bl __init_hvmode_206
+ mtlr r11
+ beqlr
+ li r0,0
+ mtspr SPRN_LPID,r0
+ bl __init_LPCR
+ bl __init_TLB
+ mtlr r11
+ blr
+
+_GLOBAL(__restore_cpu_power7)
+ mflr r11
+ mfmsr r3
+ rldicl. r0,r3,4,63
+ beqlr
+ li r0,0
+ mtspr SPRN_LPID,r0
+ bl __init_LPCR
+ bl __init_TLB
+ mtlr r11
+ blr
+
+__init_hvmode_206:
+ /* Disable CPU_FTR_HVMODE_206 and exit if MSR:HV is not set */
+ mfmsr r3
+ rldicl. r0,r3,4,63
+ bnelr
+ ld r5,CPU_SPEC_FEATURES(r4)
+ LOAD_REG_IMMEDIATE(r6,CPU_FTR_HVMODE_206)
+ xor r5,r5,r6
+ std r5,CPU_SPEC_FEATURES(r4)
+ blr
+
+__init_LPCR:
+ /* Setup a sane LPCR:
+ *
+ * LPES = 0b01 (HSRR0/1 used for 0x500)
+ * PECE = 0b111
+ * DPFD = 4
+ *
+ * Other bits untouched for now
+ */
+ mfspr r3,SPRN_LPCR
+ ori r3,r3,(LPCR_LPES0|LPCR_LPES1)
+ xori r3,r3, LPCR_LPES0
+ ori r3,r3,(LPCR_PECE0|LPCR_PECE1|LPCR_PECE2)
+ li r5,7
+ sldi r5,r5,LPCR_DPFD_SH
+ andc r3,r3,r5
+ li r5,4
+ sldi r5,r5,LPCR_DPFD_SH
+ or r3,r3,r5
+ mtspr SPRN_LPCR,r3
+ isync
+ blr
+
+__init_TLB:
+ /* Clear the TLB */
+ li r6,128
+ mtctr r6
+ li r7,0xc00 /* IS field = 0b11 */
+ ptesync
+2: tlbiel r7
+ addi r7,r7,0x1000
+ bdnz 2b
+ ptesync
+1: blr
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