095d277cd8
PowerPC kernels in r6 is actually metadata from loader(8) or gibberish left in r6, which is not required to be anything under the PAPR/ePAPR/CHRP/OF standards, by another boot loader. Note that, as a result, systems need a new boot loader to boot PPC kernels after this revision without ending up at a mountroot prompt. New boot loaders are backwards compatible and can boot older kernels. Reviewed by: jhibbits MFC after: 2 months
144 lines
3.3 KiB
ArmAsm
144 lines
3.3 KiB
ArmAsm
/* $FreeBSD$ */
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/*-
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* Copyright (C) 2010-2016 Nathan Whitehorn
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "assym.s"
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#include <sys/syscall.h>
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#include <machine/trap.h>
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#include <machine/param.h>
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#include <machine/spr.h>
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#include <machine/asm.h>
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#ifdef _CALL_ELF
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.abiversion _CALL_ELF
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#endif
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/* Glue for linker script */
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.globl kernbase
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.set kernbase, KERNBASE
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/*
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* Globals
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*/
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.data
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.align 3
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GLOBAL(__startkernel)
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.llong begin
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GLOBAL(__endkernel)
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.llong end
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.align 4
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#define TMPSTKSZ 16384 /* 16K temporary stack */
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GLOBAL(tmpstk)
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.space TMPSTKSZ
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TOC_ENTRY(tmpstk)
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.text
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.globl btext
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btext:
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/*
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* Main kernel entry point.
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*
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* Calling convention:
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* r3: Flattened Device Tree pointer (or zero)
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* r4: ignored
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* r5: OF client interface pointer (or zero)
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* r6: Loader metadata pointer (or zero)
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* r7: Magic cookie (0xfb5d104d) to indicate that r6 has loader metadata
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*/
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.text
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ASENTRY_NOPROF(__start)
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/* Set 64-bit mode if not yet set before branching to C */
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mfmsr %r20
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li %r21,1
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insrdi %r20,%r21,1,0
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mtmsrd %r20
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isync
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nop /* Make this block a multiple of 8 bytes */
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/* Set up the TOC pointer */
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b 0f
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.align 3
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0: nop
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bl 1f
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.llong __tocbase + 0x8000 - .
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1: mflr %r2
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ld %r1,0(%r2)
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add %r2,%r1,%r2
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/* Get load offset */
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ld %r31,-0x8000(%r2) /* First TOC entry is TOC base */
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subf %r31,%r31,%r2 /* Subtract from real TOC base to get base */
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/* Set up the stack pointer */
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ld %r1,TOC_REF(tmpstk)(%r2)
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addi %r1,%r1,TMPSTKSZ-96
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add %r1,%r1,%r31
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/* Relocate kernel */
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std %r3,48(%r1)
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std %r4,56(%r1)
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std %r5,64(%r1)
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std %r6,72(%r1)
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std %r7,80(%r1)
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bl 1f
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.llong _DYNAMIC-.
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1: mflr %r3
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ld %r4,0(%r3)
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add %r3,%r4,%r3
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mr %r4,%r31
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bl elf_reloc_self
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nop
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ld %r3,48(%r1)
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ld %r4,56(%r1)
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ld %r5,64(%r1)
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ld %r6,72(%r1)
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ld %r7,80(%r1)
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/* Begin CPU init */
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mr %r4,%r2 /* Replace ignored r4 with tocbase for trap handlers */
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bl powerpc_init
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nop
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/* Set stack pointer to new value and branch to mi_startup */
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mr %r1, %r3
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li %r3, 0
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std %r3, 0(%r1)
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bl mi_startup
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nop
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/* Unreachable */
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b .
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#include <powerpc/aim/trap_subr64.S>
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