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freebsd-skq/sys/powerpc/aim/locore32.S

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MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
/* $FreeBSD$ */
/*-
Remove dead code and dead comments, most notably the implemenation of the now-obsolete setfault(). No NetBSD code exists in the AIM locore files, so update the copyrights there.
2016-01-10 18:00:01 +00:00
* Copyright (C) 2010-2016 Nathan Whitehorn
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
Remove dead code and dead comments, most notably the implemenation of the now-obsolete setfault(). No NetBSD code exists in the AIM locore files, so update the copyrights there.
2016-01-10 18:00:01 +00:00
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
Rename assym.s to assym.inc assym is only to be included by other .s files, and should never actually be assembled by itself. Reviewed by: imp, bdrewery (earlier) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D14180
2018-03-20 17:58:51 +00:00
#include "assym.inc"
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
#include <sys/syscall.h>
#include <machine/trap.h>
#include <machine/param.h>
#include <machine/spr.h>
#include <machine/asm.h>
Setup BAT0 and BAT1 on the Wii. This is the missing piece for FreeBSD/Wii, but there's still a lot of work ahead. We have to reset the MMU in locore before continuing the boot process because we don't know how the boot loaders might have setup the BATs. We also disable the PCI BAT because there's no PCI bus on the Wii. Thanks to Nathan Whitehorn and Peter Grenhan for their help. Submitted by: Margarida Gouveia
2012-11-21 08:04:21 +00:00
#include "opt_platform.h"
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
/* Locate the per-CPU data structure */
#define GET_CPUINFO(r) \
mfsprg0 r
/*
* Compiled KERNBASE location and the kernel load address
*/
.globl kernbase
.set kernbase, KERNBASE
/*
* Globals
*/
.data
Refactor PowerPC (especially AIM) init sequence to be less baroque. MFC after: 2 months
2015-01-18 18:32:43 +00:00
.align 3
GLOBAL(__startkernel)
.long begin
GLOBAL(__endkernel)
.long end
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
.align 4
Refactor PowerPC (especially AIM) init sequence to be less baroque. MFC after: 2 months
2015-01-18 18:32:43 +00:00
#define TMPSTKSZ 8192 /* 8K temporary stack */
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
GLOBAL(tmpstk)
.space TMPSTKSZ
.text
.globl btext
btext:
/*
Remove dead code and dead comments, most notably the implemenation of the now-obsolete setfault(). No NetBSD code exists in the AIM locore files, so update the copyrights there.
2016-01-10 18:00:01 +00:00
* Main kernel entry point.
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
*/
.text
.globl __start
__start:
Make 32-bit PowerPC kernels, like 64-bit PowerPC kernels, position-independent executables. The goal here, not yet accomplished, is to let the e500 kernel run under QEMU by setting KERNBASE to something that fits in low memory and then having the kernel relocate itself at runtime.
2015-03-07 20:14:46 +00:00
/* Figure out where we are */
bl 1f
.long _DYNAMIC-.
.long _GLOBAL_OFFSET_TABLE_-.
.long tmpstk-.
1: mflr %r30
/* Set up temporary stack pointer */
lwz %r1,8(%r30)
add %r1,%r1,%r30
Use the cookie now set by loader to determine whether the value passed to 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
2017-11-26 03:53:20 +00:00
addi %r1,%r1,(8+TMPSTKSZ-40)
Make 32-bit PowerPC kernels, like 64-bit PowerPC kernels, position-independent executables. The goal here, not yet accomplished, is to let the e500 kernel run under QEMU by setting KERNBASE to something that fits in low memory and then having the kernel relocate itself at runtime.
2015-03-07 20:14:46 +00:00
/* Relocate self */
stw %r3,16(%r1)
stw %r4,20(%r1)
stw %r5,24(%r1)
stw %r6,28(%r1)
Use the cookie now set by loader to determine whether the value passed to 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
2017-11-26 03:53:20 +00:00
stw %r7,32(%r1)
Make 32-bit PowerPC kernels, like 64-bit PowerPC kernels, position-independent executables. The goal here, not yet accomplished, is to let the e500 kernel run under QEMU by setting KERNBASE to something that fits in low memory and then having the kernel relocate itself at runtime.
2015-03-07 20:14:46 +00:00
lwz %r3,0(%r30) /* _DYNAMIC in %r3 */
add %r3,%r3,%r30
lwz %r4,4(%r30) /* GOT pointer */
add %r4,%r4,%r30
lwz %r4,4(%r4) /* got[0] is _DYNAMIC link addr */
subf %r4,%r4,%r3 /* subtract to calculate relocbase */
bl elf_reloc_self
Zero BSS on start, in case the ELF loader that started the kernel did not do this for us. This can happen on some embedded systems. Submitted by: rpaulo
2011-12-16 23:40:56 +00:00
Make 32-bit PowerPC kernels, like 64-bit PowerPC kernels, position-independent executables. The goal here, not yet accomplished, is to let the e500 kernel run under QEMU by setting KERNBASE to something that fits in low memory and then having the kernel relocate itself at runtime.
2015-03-07 20:14:46 +00:00
lwz %r3,16(%r1)
lwz %r4,20(%r1)
lwz %r5,24(%r1)
lwz %r6,28(%r1)
Use the cookie now set by loader to determine whether the value passed to 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
2017-11-26 03:53:20 +00:00
lwz %r7,32(%r1)
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
Make 32-bit PowerPC kernels, like 64-bit PowerPC kernels, position-independent executables. The goal here, not yet accomplished, is to let the e500 kernel run under QEMU by setting KERNBASE to something that fits in low memory and then having the kernel relocate itself at runtime.
2015-03-07 20:14:46 +00:00
/* MD setup */
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
bl powerpc_init
Make 32-bit PowerPC kernels, like 64-bit PowerPC kernels, position-independent executables. The goal here, not yet accomplished, is to let the e500 kernel run under QEMU by setting KERNBASE to something that fits in low memory and then having the kernel relocate itself at runtime.
2015-03-07 20:14:46 +00:00
/* Set stack pointer to new value and branch to mi_startup */
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
mr %r1, %r3
li %r3, 0
stw %r3, 0(%r1)
bl mi_startup
Make 32-bit PowerPC kernels, like 64-bit PowerPC kernels, position-independent executables. The goal here, not yet accomplished, is to let the e500 kernel run under QEMU by setting KERNBASE to something that fits in low memory and then having the kernel relocate itself at runtime.
2015-03-07 20:14:46 +00:00
Remove dead code and dead comments, most notably the implemenation of the now-obsolete setfault(). No NetBSD code exists in the AIM locore files, so update the copyrights there.
2016-01-10 18:00:01 +00:00
/* mi_startup() does not return */
b .
MFppc64: Kernel sources for 64-bit PowerPC, along with build-system changes to keep 32-bit kernels compiling (build system changes for 64-bit kernels are coming later). Existing 32-bit PowerPC kernel configurations must be updated after this change to specify their architecture.
2010-07-13 05:32:19 +00:00
#include <powerpc/aim/trap_subr32.S>
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