forked from Minki/linux
656ad58ef1
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>
59 lines
1.2 KiB
ArmAsm
59 lines
1.2 KiB
ArmAsm
/*
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* Copyright (c) 2016 IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include "ppc_asm.h"
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#include "../include/asm/opal-api.h"
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.text
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#define OPAL_CALL(name, token) \
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.globl name; \
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name: \
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li r0, token; \
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b opal_call;
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opal_call:
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mflr r11
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std r11,16(r1)
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mfcr r12
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stw r12,8(r1)
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mr r13,r2
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/* Set opal return address */
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ld r11,opal_return@got(r2)
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mtlr r11
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mfmsr r12
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/* switch to BE when we enter OPAL */
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li r11,MSR_LE
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andc r12,r12,r11
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mtspr SPRN_HSRR1,r12
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/* load the opal call entry point and base */
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ld r11,opal@got(r2)
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ld r12,8(r11)
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ld r2,0(r11)
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mtspr SPRN_HSRR0,r12
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hrfid
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opal_return:
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FIXUP_ENDIAN
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mr r2,r13;
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lwz r11,8(r1);
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ld r12,16(r1)
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mtcr r11;
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mtlr r12
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blr
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OPAL_CALL(opal_console_write, OPAL_CONSOLE_WRITE);
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OPAL_CALL(opal_console_read, OPAL_CONSOLE_READ);
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OPAL_CALL(opal_console_write_buffer_space, OPAL_CONSOLE_WRITE_BUFFER_SPACE);
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OPAL_CALL(opal_poll_events, OPAL_POLL_EVENTS);
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OPAL_CALL(opal_console_flush, OPAL_CONSOLE_FLUSH);
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