/* * 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 mfspr r3,SPRN_LPCR 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 mfspr r3,SPRN_LPCR bl __init_LPCR bl __init_TLB mtlr r11 blr _GLOBAL(__setup_cpu_power8) mflr r11 bl __init_FSCR bl __init_PMU bl __init_hvmode_206 mtlr r11 beqlr li r0,0 mtspr SPRN_LPID,r0 mfspr r3,SPRN_LPCR oris r3, r3, LPCR_AIL_3@h bl __init_LPCR bl __init_HFSCR bl __init_TLB bl __init_PMU_HV mtlr r11 blr _GLOBAL(__restore_cpu_power8) mflr r11 bl __init_FSCR bl __init_PMU mfmsr r3 rldicl. r0,r3,4,63 mtlr r11 beqlr li r0,0 mtspr SPRN_LPID,r0 mfspr r3,SPRN_LPCR oris r3, r3, LPCR_AIL_3@h bl __init_LPCR bl __init_HFSCR bl __init_TLB bl __init_PMU_HV mtlr r11 blr __init_hvmode_206: /* Disable CPU_FTR_HVMODE 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) xor r5,r5,r6 std r5,CPU_SPEC_FEATURES(r4) blr __init_LPCR: /* Setup a sane LPCR: * Called with initial LPCR in R3 * * LPES = 0b01 (HSRR0/1 used for 0x500) * PECE = 0b111 * DPFD = 4 * HDICE = 0 * VC = 0b100 (VPM0=1, VPM1=0, ISL=0) * VRMASD = 0b10000 (L=1, LP=00) * * Other bits untouched for now */ li r5,1 rldimi r3,r5, LPCR_LPES_SH, 64-LPCR_LPES_SH-2 ori r3,r3,(LPCR_PECE0|LPCR_PECE1|LPCR_PECE2) li r5,4 rldimi r3,r5, LPCR_DPFD_SH, 64-LPCR_DPFD_SH-3 clrrdi r3,r3,1 /* clear HDICE */ li r5,4 rldimi r3,r5, LPCR_VC_SH, 0 li r5,0x10 rldimi r3,r5, LPCR_VRMASD_SH, 64-LPCR_VRMASD_SH-5 mtspr SPRN_LPCR,r3 isync blr __init_FSCR: mfspr r3,SPRN_FSCR ori r3,r3,FSCR_TAR|FSCR_DSCR|FSCR_EBB mtspr SPRN_FSCR,r3 blr __init_HFSCR: mfspr r3,SPRN_HFSCR ori r3,r3,HFSCR_TAR|HFSCR_TM|HFSCR_BHRB|HFSCR_PM|\ HFSCR_DSCR|HFSCR_VECVSX|HFSCR_FP|HFSCR_EBB mtspr SPRN_HFSCR,r3 blr __init_TLB: /* * Clear the TLB using the "IS 3" form of tlbiel instruction * (invalidate by congruence class). P7 has 128 CCs, P8 has 512 * so we just always do 512 */ li r6,512 mtctr r6 li r7,0xc00 /* IS field = 0b11 */ ptesync 2: tlbiel r7 addi r7,r7,0x1000 bdnz 2b ptesync 1: blr __init_PMU_HV: li r5,0 mtspr SPRN_MMCRC,r5 mtspr SPRN_MMCRH,r5 blr __init_PMU: li r5,0 mtspr SPRN_MMCRS,r5 mtspr SPRN_MMCRA,r5 mtspr SPRN_MMCR0,r5 mtspr SPRN_MMCR1,r5 mtspr SPRN_MMCR2,r5 blr