| /* |
| * 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,R0) |
| 1: |
| blr |
| |
| _GLOBAL(__restore_cpu_a2) |
| b __setup_cpu_a2 |
