| /* |
| * PowerNV OPAL takeover assembly code, for use by prom_init.c |
| * |
| * Copyright 2011 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/ppc_asm.h> |
| #include <asm/hvcall.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/opal.h> |
| |
| #define H_HAL_TAKEOVER 0x5124 |
| #define H_HAL_TAKEOVER_QUERY_MAGIC -1 |
| |
| .text |
| _GLOBAL(opal_query_takeover) |
| mfcr r0 |
| stw r0,8(r1) |
| std r3,STK_PARAM(R3)(r1) |
| std r4,STK_PARAM(R4)(r1) |
| li r3,H_HAL_TAKEOVER |
| li r4,H_HAL_TAKEOVER_QUERY_MAGIC |
| HVSC |
| ld r10,STK_PARAM(R3)(r1) |
| std r4,0(r10) |
| ld r10,STK_PARAM(R4)(r1) |
| std r5,0(r10) |
| lwz r0,8(r1) |
| mtcrf 0xff,r0 |
| blr |
| |
| _GLOBAL(opal_do_takeover) |
| mfcr r0 |
| stw r0,8(r1) |
| mflr r0 |
| std r0,16(r1) |
| bl __opal_do_takeover |
| ld r0,16(r1) |
| mtlr r0 |
| lwz r0,8(r1) |
| mtcrf 0xff,r0 |
| blr |
| |
| __opal_do_takeover: |
| ld r4,0(r3) |
| ld r5,0x8(r3) |
| ld r6,0x10(r3) |
| ld r7,0x18(r3) |
| ld r8,0x20(r3) |
| ld r9,0x28(r3) |
| ld r10,0x30(r3) |
| ld r11,0x38(r3) |
| li r3,H_HAL_TAKEOVER |
| HVSC |
| blr |
| |
| .globl opal_secondary_entry |
| opal_secondary_entry: |
| mr r31,r3 |
| mfmsr r11 |
| li r12,(MSR_SF | MSR_ISF)@highest |
| sldi r12,r12,48 |
| or r11,r11,r12 |
| mtmsrd r11 |
| isync |
| mfspr r4,SPRN_PIR |
| std r4,0(r3) |
| 1: HMT_LOW |
| ld r4,8(r3) |
| cmpli cr0,r4,0 |
| beq 1b |
| HMT_MEDIUM |
| 1: addi r3,r31,16 |
| bl __opal_do_takeover |
| b 1b |
| |
| _GLOBAL(opal_enter_rtas) |
| mflr r0 |
| std r0,16(r1) |
| stdu r1,-PROM_FRAME_SIZE(r1) /* Save SP and create stack space */ |
| |
| /* Because PROM is running in 32b mode, it clobbers the high order half |
| * of all registers that it saves. We therefore save those registers |
| * PROM might touch to the stack. (r0, r3-r13 are caller saved) |
| */ |
| SAVE_GPR(2, r1) |
| SAVE_GPR(13, r1) |
| SAVE_8GPRS(14, r1) |
| SAVE_10GPRS(22, r1) |
| mfcr r10 |
| mfmsr r11 |
| std r10,_CCR(r1) |
| std r11,_MSR(r1) |
| |
| /* Get the PROM entrypoint */ |
| mtlr r5 |
| |
| /* Switch MSR to 32 bits mode |
| */ |
| li r12,1 |
| rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG) |
| andc r11,r11,r12 |
| li r12,1 |
| rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG) |
| andc r11,r11,r12 |
| mtmsrd r11 |
| isync |
| |
| /* Enter RTAS here... */ |
| blrl |
| |
| /* Just make sure that r1 top 32 bits didn't get |
| * corrupt by OF |
| */ |
| rldicl r1,r1,0,32 |
| |
| /* Restore the MSR (back to 64 bits) */ |
| ld r0,_MSR(r1) |
| MTMSRD(r0) |
| isync |
| |
| /* Restore other registers */ |
| REST_GPR(2, r1) |
| REST_GPR(13, r1) |
| REST_8GPRS(14, r1) |
| REST_10GPRS(22, r1) |
| ld r4,_CCR(r1) |
| mtcr r4 |
| |
| addi r1,r1,PROM_FRAME_SIZE |
| ld r0,16(r1) |
| mtlr r0 |
| blr |
