d929c32b7f
Most of the effect of setting MSR[SF] is that the CPU will stop ignoring the high 32 bits of registers containing addresses in load/store instructions. As such, the kernel was setting it only when it began to need access to high memory. MSR[SF] also affects the operation of some conditional instructions, however, and so setting it at late times could subtly break code at very early times. This fixes use of the FDT mode in loader, and FDT boot more generally, on 64-bit PowerPC systems. Hardware provided by: IBM LTC Approved by: re (kib)
140 lines
3.2 KiB
ArmAsm
140 lines
3.2 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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*/
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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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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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/* 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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