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SUSE:SLE-12-SP2:GA
grub2.3179
grub2-ppc64le-14-Add-powerpc64-ieee1275-trampol...
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File grub2-ppc64le-14-Add-powerpc64-ieee1275-trampoline.patch of Package grub2.3179
From dc0b31e8fe09b4143488e85a7aeb7c532e48f81d Mon Sep 17 00:00:00 2001 From: Anton Blanchard <anton@samba.org> Date: Wed, 29 Jan 2014 10:40:17 +1100 Subject: [PATCH 14/23] Add powerpc64 ieee1275 trampoline Add a trampoline so a 64bit grub can call a 32 bit OF Signed-off-by: Ram Pai <linuxram@us.ibm.com> From: Anton Blanchard <anton@samba.org> --- grub-core/Makefile.core.def | 1 + grub-core/kern/powerpc/ieee1275/entry.S | 150 +++++++++++++++++++++++++++++++ include/grub/powerpc/ieee1275/ieee1275.h | 6 ++ 3 files changed, 157 insertions(+) create mode 100644 grub-core/kern/powerpc/ieee1275/entry.S diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def index 42443bc..9563eeb 100644 --- a/grub-core/Makefile.core.def +++ b/grub-core/Makefile.core.def @@ -252,6 +252,7 @@ kernel = { powerpc_ieee1275 = kern/powerpc/cache.S; powerpc_ieee1275 = kern/powerpc/dl.c; + powerpc_ieee1275 = kern/powerpc/ieee1275/entry.S; sparc64_ieee1275 = kern/sparc64/cache.S; sparc64_ieee1275 = kern/sparc64/dl.c; diff --git a/grub-core/kern/powerpc/ieee1275/entry.S b/grub-core/kern/powerpc/ieee1275/entry.S new file mode 100644 index 0000000..5d58149 --- /dev/null +++ b/grub-core/kern/powerpc/ieee1275/entry.S @@ -0,0 +1,150 @@ +/* entry.S - open firmware call entry and return */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2004,2007,2010,2014 Free Software Foundation, Inc. + * + * GRUB 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 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <ppc-asm.h> + +#define STACK_FRAME_SIZE (48 + 64 + 16 + 144) +#define MSR_OFFSET (48 + 64) +#define R13_OFFSET (MSR_OFFSET + 8) +#define NVREG_OFFSET(i) (STACK_FRAME_SIZE - (32-(i))*8) +#define SAVE_NVGPR(A) std (A),NVREG_OFFSET(A)(r1) +#define REST_NVGPR(A) ld (A),NVREG_OFFSET(A)(r1) +#define SPRN_SRR0 0x01A +#define SPRN_SRR1 0x01B +#define r1 sp + + +#if defined(_CALL_ELF) && _CALL_ELF == 1 /* BIG ENDIAN */ +#define TOC_OFFSET 40 +#define r2 toc +#endif + +/* + * OF runs in 32 bit mode so it clobbers the high 32 bits of all registers + * it saves. We save and restore all the non volatile registers to avoid + * this issue. + * + * unsigned int ieee1275_call_entry_fn(void *args, unsigned long entry); + */ +FUNC_START(ieee1275_call_entry_fn) + mflr r0 + std r0,16(r1) + stdu r1,-STACK_FRAME_SIZE(r1) + +#if defined(_CALL_ELF) && _CALL_ELF == 1 /* BIG ENDIAN */ + std r2,TOC_OFFSET(r1) +#endif + std r13,R13_OFFSET(r1) + + SAVE_NVGPR(r14) + SAVE_NVGPR(r15) + SAVE_NVGPR(r16) + SAVE_NVGPR(r17) + SAVE_NVGPR(r18) + SAVE_NVGPR(r19) + SAVE_NVGPR(r20) + SAVE_NVGPR(r21) + SAVE_NVGPR(r22) + SAVE_NVGPR(r23) + SAVE_NVGPR(r24) + SAVE_NVGPR(r25) + SAVE_NVGPR(r26) + SAVE_NVGPR(r27) + SAVE_NVGPR(r28) + SAVE_NVGPR(r29) + SAVE_NVGPR(r30) + SAVE_NVGPR(r31) + + mfmsr r31 + std r31, MSR_OFFSET(r1) + + /* Clear 64bit mode */ + rldicl r31,r31,0,1 + +#if defined(_CALL_ELF) && _CALL_ELF == 2 /* LITTLE ENDIAN */ + /* Clear LE mode */ + rldicr r31,r31,0,62 +#endif + + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r31 + + /* Point the LR at our return code */ + bl 1f +1: mflr r30 + addi r30,r30,(2f - 1b) + mtlr r30 + + /* Call OF */ + rfid + +#if defined(_CALL_ELF) && _CALL_ELF == 2 /* LITTLE ENDIAN */ +2: .long 0x05009f42 /* bcl 20,31,$+4 */ + .long 0xa602487d /* mflr r10 */ + .long 0x1c004a39 /* addi r10,r10,28 */ + .long 0xa6035a7d /* mtsrr0 r10 */ + .long 0xa600407d /* mfmsr r10 */ + .long 0x01004a69 /* xori r10,r10,1 */ + .long 0xa6035b7d /* mtsrr1 r10 */ + .long 0x2400004c /* rfid */ +#endif + + /* Clear the top 32 bits of r1, just in case */ +2: rldicl r1,r1,0,32 + + /* Reset our MSR */ + ld r31,MSR_OFFSET(r1) + mtspr SPRN_SRR1,r31 + + bl 3f +3: mflr r30 + addi r30,r30,(4f - 3b) + mtspr SPRN_SRR0,r30 + + rfid + +#if defined(_CALL_ELF) && _CALL_ELF == 1 /* BIG ENDIAN */ +4: ld r2,TOC_OFFSET(r1) +#endif +4: ld r13,R13_OFFSET(r1) + + REST_NVGPR(r14) + REST_NVGPR(r15) + REST_NVGPR(r16) + REST_NVGPR(r17) + REST_NVGPR(r18) + REST_NVGPR(r19) + REST_NVGPR(r20) + REST_NVGPR(r21) + REST_NVGPR(r22) + REST_NVGPR(r23) + REST_NVGPR(r24) + REST_NVGPR(r25) + REST_NVGPR(r26) + REST_NVGPR(r27) + REST_NVGPR(r28) + REST_NVGPR(r29) + REST_NVGPR(r30) + REST_NVGPR(r31) + + addi r1,r1,STACK_FRAME_SIZE + ld r0,16(r1) + mtlr r0 + blr +FUNC_END(ieee1275_call_entry_fn) diff --git a/include/grub/powerpc/ieee1275/ieee1275.h b/include/grub/powerpc/ieee1275/ieee1275.h index 3c7683f..14bdc43 100644 --- a/include/grub/powerpc/ieee1275/ieee1275.h +++ b/include/grub/powerpc/ieee1275/ieee1275.h @@ -25,4 +25,10 @@ #define GRUB_IEEE1275_CELL_SIZEOF 4 typedef grub_uint32_t grub_ieee1275_cell_t; +#ifdef __powerpc64__ +int EXPORT_FUNC(ieee1275_call_entry_fn)(void *args, void *entry); +#define IEEE1275_CALL_ENTRY_FN(args) \ + ieee1275_call_entry_fn((args), grub_ieee1275_entry_fn) +#endif + #endif /* ! GRUB_IEEE1275_MACHINE_HEADER */ -- 1.8.3.1
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