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/*
* 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)
stdu r1,-STACKFRAMESIZE(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
addi r1,r1,STACKFRAMESIZE
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
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