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/*
* A2 specific assembly support code
*
* Copyright 2009 Ben Herrenschmidt, IBM Corp.
*
* 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/asm-offsets.h>
#include <asm/ppc_asm.h>
#include <asm/ppc-opcode.h>
#include <asm/processor.h>
#include <asm/reg_a2.h>
#include <asm/reg.h>
#include <asm/thread_info.h>
/*
* Disable thdid and class fields in ERATs to bump PID to full 14 bits capacity.
* This also prevents external LPID accesses but that isn't a problem when not a
* guest. Under PV, this setting will be ignored and MMUCR will return the right
* number of PID bits we can use.
*/
#define MMUCR1_EXTEND_PID \
(MMUCR1_ICTID | MMUCR1_ITTID | MMUCR1_DCTID | \
MMUCR1_DTTID | MMUCR1_DCCD)
/*
* Use extended PIDs if enabled.
* Don't clear the ERATs on context sync events and enable I & D LRU.
* Enable ERAT back invalidate when tlbwe overwrites an entry.
*/
#define INITIAL_MMUCR1 \
(MMUCR1_EXTEND_PID | MMUCR1_CSINV_NEVER | MMUCR1_IRRE | \
MMUCR1_DRRE | MMUCR1_TLBWE_BINV)
_GLOBAL(__setup_cpu_a2)
/* Some of these are actually thread local and some are
* core local but doing it always won't hurt
*/
#ifdef CONFIG_PPC_ICSWX
/* Make sure ACOP starts out as zero */
li r3,0
mtspr SPRN_ACOP,r3
/* Skip the following if we are in Guest mode */
mfmsr r3
andis. r0,r3,MSR_GS@h
bne _icswx_skip_guest
/* Enable icswx instruction */
mfspr r3,SPRN_A2_CCR2
ori r3,r3,A2_CCR2_ENABLE_ICSWX
mtspr SPRN_A2_CCR2,r3
/* Unmask all CTs in HACOP */
li r3,-1
mtspr SPRN_HACOP,r3
_icswx_skip_guest:
#endif /* CONFIG_PPC_ICSWX */
/* Enable doorbell */
mfspr r3,SPRN_A2_CCR2
oris r3,r3,A2_CCR2_ENABLE_PC@h
mtspr SPRN_A2_CCR2,r3
isync
/* Setup CCR0 to disable power saving for now as it's busted
* in the current implementations. Setup CCR1 to wake on
* interrupts normally (we write the default value but who
* knows what FW may have clobbered...)
*/
li r3,0
mtspr SPRN_A2_CCR0, r3
LOAD_REG_IMMEDIATE(r3,0x0f0f0f0f)
mtspr SPRN_A2_CCR1, r3
/* Initialise MMUCR1 */
lis r3,INITIAL_MMUCR1@h
ori r3,r3,INITIAL_MMUCR1@l
mtspr SPRN_MMUCR1,r3
/* Set MMUCR2 to enable 4K, 64K, 1M, 16M and 1G pages */
LOAD_REG_IMMEDIATE(r3, 0x000a7531)
mtspr SPRN_MMUCR2,r3
/* Set MMUCR3 to write all thids bit to the TLB */
LOAD_REG_IMMEDIATE(r3, 0x0000000f)
mtspr SPRN_MMUCR3,r3
/* Don't do ERAT stuff if running guest mode */
mfmsr r3
andis. r0,r3,MSR_GS@h
bne 1f
/* Now set the I-ERAT watermark to 15 */
lis r4,(MMUCR0_TLBSEL_I|MMUCR0_ECL)@h
mtspr SPRN_MMUCR0, r4
li r4,A2_IERAT_SIZE-1
PPC_ERATWE(r4,r4,3)
/* Now set the D-ERAT watermark to 31 */
lis r4,(MMUCR0_TLBSEL_D|MMUCR0_ECL)@h
mtspr SPRN_MMUCR0, r4
li r4,A2_DERAT_SIZE-1
PPC_ERATWE(r4,r4,3)
/* And invalidate the beast just in case. That won't get rid of
* a bolted entry though it will be in LRU and so will go away eventually
* but let's not bother for now
*/
PPC_ERATILX(0,0,0)
1:
blr
_GLOBAL(__restore_cpu_a2)
b __setup_cpu_a2
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