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969391c58a
This replaces the single CPU_FTR_HVMODE_206 bit with two bits, one to indicate that we have a usable hypervisor mode, and another to indicate that the processor conforms to PowerISA version 2.06. We also add another bit to indicate that the processor conforms to ISA version 2.01 and set that for PPC970 and derivatives. Some PPC970 chips (specifically those in Apple machines) have a hypervisor mode in that MSR[HV] is always 1, but the hypervisor mode is not useful in the sense that there is no way to run any code in supervisor mode (HV=0 PR=0). On these processors, the LPES0 and LPES1 bits in HID4 are always 0, and we use that as a way of detecting that hypervisor mode is not useful. Where we have a feature section in assembly code around code that only applies on POWER7 in hypervisor mode, we use a construct like END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) The definition of END_FTR_SECTION_IFSET is such that the code will be enabled (not overwritten with nops) only if all bits in the provided mask are set. Note that the CPU feature check in __tlbie() only needs to check the ARCH_206 bit, not the HVMODE bit, because __tlbie() can only get called if we are running bare-metal, i.e. in hypervisor mode. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
211 lines
4.1 KiB
ArmAsm
211 lines
4.1 KiB
ArmAsm
/*
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* This file contains low level CPU setup functions.
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* Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/cputable.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/cache.h>
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_GLOBAL(__cpu_preinit_ppc970)
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/* Do nothing if not running in HV mode */
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mfmsr r0
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rldicl. r0,r0,4,63
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beqlr
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/* Make sure HID4:rm_ci is off before MMU is turned off, that large
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* pages are enabled with HID4:61 and clear HID5:DCBZ_size and
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* HID5:DCBZ32_ill
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*/
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li r0,0
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mfspr r3,SPRN_HID4
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rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */
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rldimi r3,r0,2,61 /* clear bit 61 (lg_pg_en) */
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sync
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mtspr SPRN_HID4,r3
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isync
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sync
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mfspr r3,SPRN_HID5
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rldimi r3,r0,6,56 /* clear bits 56 & 57 (DCBZ*) */
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sync
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mtspr SPRN_HID5,r3
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isync
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sync
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/* Setup some basic HID1 features */
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mfspr r0,SPRN_HID1
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li r3,0x1200 /* enable i-fetch cacheability */
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sldi r3,r3,44 /* and prefetch */
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or r0,r0,r3
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mtspr SPRN_HID1,r0
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mtspr SPRN_HID1,r0
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isync
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/* Clear HIOR */
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li r0,0
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sync
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mtspr SPRN_HIOR,0 /* Clear interrupt prefix */
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isync
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blr
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/* Definitions for the table use to save CPU states */
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#define CS_HID0 0
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#define CS_HID1 8
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#define CS_HID4 16
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#define CS_HID5 24
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#define CS_SIZE 32
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.data
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.balign L1_CACHE_BYTES,0
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cpu_state_storage:
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.space CS_SIZE
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.balign L1_CACHE_BYTES,0
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.text
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_GLOBAL(__setup_cpu_ppc970)
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/* Do nothing if not running in HV mode */
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mfmsr r0
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rldicl. r0,r0,4,63
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beq no_hv_mode
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mfspr r0,SPRN_HID0
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li r11,5 /* clear DOZE and SLEEP */
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rldimi r0,r11,52,8 /* set NAP and DPM */
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li r11,0
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rldimi r0,r11,32,31 /* clear EN_ATTN */
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b load_hids /* Jump to shared code */
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_GLOBAL(__setup_cpu_ppc970MP)
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/* Do nothing if not running in HV mode */
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mfmsr r0
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rldicl. r0,r0,4,63
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beq no_hv_mode
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mfspr r0,SPRN_HID0
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li r11,0x15 /* clear DOZE and SLEEP */
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rldimi r0,r11,52,6 /* set DEEPNAP, NAP and DPM */
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li r11,0
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rldimi r0,r11,32,31 /* clear EN_ATTN */
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load_hids:
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mtspr SPRN_HID0,r0
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mfspr r0,SPRN_HID0
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mfspr r0,SPRN_HID0
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mfspr r0,SPRN_HID0
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mfspr r0,SPRN_HID0
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mfspr r0,SPRN_HID0
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mfspr r0,SPRN_HID0
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sync
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isync
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/* Try to set LPES = 01 in HID4 */
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mfspr r0,SPRN_HID4
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clrldi r0,r0,1 /* clear LPES0 */
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ori r0,r0,HID4_LPES1 /* set LPES1 */
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sync
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mtspr SPRN_HID4,r0
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isync
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/* Save away cpu state */
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LOAD_REG_ADDR(r5,cpu_state_storage)
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/* Save HID0,1,4 and 5 */
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mfspr r3,SPRN_HID0
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std r3,CS_HID0(r5)
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mfspr r3,SPRN_HID1
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std r3,CS_HID1(r5)
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mfspr r4,SPRN_HID4
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std r4,CS_HID4(r5)
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mfspr r3,SPRN_HID5
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std r3,CS_HID5(r5)
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/* See if we successfully set LPES1 to 1; if not we are in Apple mode */
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andi. r4,r4,HID4_LPES1
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bnelr
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no_hv_mode:
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/* Disable CPU_FTR_HVMODE and exit, since we don't have HV mode */
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ld r5,CPU_SPEC_FEATURES(r4)
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LOAD_REG_IMMEDIATE(r6,CPU_FTR_HVMODE)
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andc r5,r5,r6
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std r5,CPU_SPEC_FEATURES(r4)
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blr
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/* Called with no MMU context (typically MSR:IR/DR off) to
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* restore CPU state as backed up by the previous
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* function. This does not include cache setting
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*/
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_GLOBAL(__restore_cpu_ppc970)
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/* Do nothing if not running in HV mode */
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mfmsr r0
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rldicl. r0,r0,4,63
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beqlr
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LOAD_REG_ADDR(r5,cpu_state_storage)
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/* Before accessing memory, we make sure rm_ci is clear */
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li r0,0
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mfspr r3,SPRN_HID4
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rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */
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sync
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mtspr SPRN_HID4,r3
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isync
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sync
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/* Clear interrupt prefix */
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li r0,0
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sync
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mtspr SPRN_HIOR,0
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isync
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/* Restore HID0 */
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ld r3,CS_HID0(r5)
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sync
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isync
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mtspr SPRN_HID0,r3
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mfspr r3,SPRN_HID0
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mfspr r3,SPRN_HID0
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mfspr r3,SPRN_HID0
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mfspr r3,SPRN_HID0
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mfspr r3,SPRN_HID0
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mfspr r3,SPRN_HID0
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sync
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isync
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/* Restore HID1 */
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ld r3,CS_HID1(r5)
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sync
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isync
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mtspr SPRN_HID1,r3
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mtspr SPRN_HID1,r3
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sync
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isync
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/* Restore HID4 */
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ld r3,CS_HID4(r5)
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sync
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isync
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mtspr SPRN_HID4,r3
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sync
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isync
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/* Restore HID5 */
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ld r3,CS_HID5(r5)
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sync
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isync
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mtspr SPRN_HID5,r3
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sync
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isync
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blr
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