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OpenCloudOS-Kernel/arch/powerpc/boot/opal-calls.S

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27 14:55:01 +08:00
/* SPDX-License-Identifier: GPL-2.0-or-later */
powerpc/boot: Add OPAL console to epapr wrappers This patch adds an OPAL console backend to the powerpc boot wrapper so that decompression failures inside the wrapper can be reported to the user. This is important since it typically indicates data corruption in the firmware and other nasty things. Currently this only works when building a little endian kernel. When compiling a 64 bit BE kernel the wrapper is always build 32 bit to be compatible with some 32 bit firmwares. BE support will be added at a later date. Another limitation of this is that only the "raw" type of OPAL console is supported, however machines that provide a hvsi console also provide a raw console so this is not an issue in practice. Actually-written-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> [mpe: Move #ifdef __powerpc64__ to avoid warnings on 32-bit] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-06-30 22:34:37 +08:00
/*
* Copyright (c) 2016 IBM Corporation.
*/
#include "ppc_asm.h"
#include "../include/asm/opal-api.h"
.text
powerpc/boot: Fix the early OPAL console wrappers When configured with CONFIG_PPC_EARLY_DEBUG_OPAL=y the kernel expects the OPAL entry and base addresses to be passed in r8 and r9 respectively. Currently the wrapper does not attempt to restore these values before entering the decompressed kernel which causes the kernel to branch into whatever happens to be in r9 when doing a write to the OPAL console in early boot. This patch adds a platform_ops hook that can be used to branch into the new kernel. The OPAL console driver patches this at runtime so that if the console is used it will be restored just prior to entering the kernel. Fixes: 656ad58ef19e ("powerpc/boot: Add OPAL console to epapr wrappers") Cc: stable@vger.kernel.org # v4.8+ Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-11-23 10:55:13 +08:00
.globl opal_kentry
opal_kentry:
/* r3 is the fdt ptr */
mtctr r4
li r4, 0
li r5, 0
li r6, 0
li r7, 0
ld r11,opal@got(r2)
ld r8,0(r11)
ld r9,8(r11)
bctr
powerpc/boot: Add OPAL console to epapr wrappers This patch adds an OPAL console backend to the powerpc boot wrapper so that decompression failures inside the wrapper can be reported to the user. This is important since it typically indicates data corruption in the firmware and other nasty things. Currently this only works when building a little endian kernel. When compiling a 64 bit BE kernel the wrapper is always build 32 bit to be compatible with some 32 bit firmwares. BE support will be added at a later date. Another limitation of this is that only the "raw" type of OPAL console is supported, however machines that provide a hvsi console also provide a raw console so this is not an issue in practice. Actually-written-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> [mpe: Move #ifdef __powerpc64__ to avoid warnings on 32-bit] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-06-30 22:34:37 +08:00
#define OPAL_CALL(name, token) \
.globl name; \
name: \
li r0, token; \
b opal_call;
opal_call:
mflr r11
std r11,16(r1)
mfcr r12
stw r12,8(r1)
mr r13,r2
/* Set opal return address */
ld r11,opal_return@got(r2)
mtlr r11
mfmsr r12
/* switch to BE when we enter OPAL */
li r11,MSR_LE
andc r12,r12,r11
mtspr SPRN_HSRR1,r12
/* load the opal call entry point and base */
ld r11,opal@got(r2)
ld r12,8(r11)
ld r2,0(r11)
mtspr SPRN_HSRR0,r12
hrfid
opal_return:
FIXUP_ENDIAN
mr r2,r13;
lwz r11,8(r1);
ld r12,16(r1)
mtcr r11;
mtlr r12
blr
OPAL_CALL(opal_console_write, OPAL_CONSOLE_WRITE);
OPAL_CALL(opal_console_read, OPAL_CONSOLE_READ);
OPAL_CALL(opal_console_write_buffer_space, OPAL_CONSOLE_WRITE_BUFFER_SPACE);
OPAL_CALL(opal_poll_events, OPAL_POLL_EVENTS);
OPAL_CALL(opal_console_flush, OPAL_CONSOLE_FLUSH);