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/* $FreeBSD$ */
/* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */
/*-
* Copyright (C) 2001 Benno Rice
* 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.
*
* THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
* 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.
*/
/*-
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* 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.
*/
#include "assym.s"
#include <sys/syscall.h>
#include <machine/trap.h>
#include <machine/param.h>
#include <machine/spr.h>
#include <machine/asm.h>
/* 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
#define TMPSTKSZ 8192 /* 8K temporary stack */
#define OFWSTKSZ 4096 /* 4K Open Firmware stack */
/*
* Globals
*/
.data
.align 4
GLOBAL(tmpstk)
.space TMPSTKSZ
GLOBAL(ofwstk)
.space OFWSTKSZ
GLOBAL(esym)
.llong 0 /* end of symbol table */
GLOBAL(ofmsr)
.llong 0, 0, 0, 0, 0 /* msr/sprg0-3 used in Open Firmware */
#define INTRCNT_COUNT 256 /* max(HROWPIC_IRQMAX,OPENPIC_IRQMAX) */
GLOBAL(intrnames)
.space INTRCNT_COUNT * (MAXCOMLEN + 1) * 2
GLOBAL(eintrnames)
.align 4
GLOBAL(intrcnt)
.space INTRCNT_COUNT * 4 * 2
GLOBAL(eintrcnt)
/*
* File-scope for locore.S
*/
idle_u:
.llong 0 /* fake uarea during idle after exit */
openfirmware_entry:
.llong 0 /* Open Firmware entry point */
srsave:
.llong 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.text
.globl btext
btext:
/*
* This symbol is here for the benefit of kvm_mkdb, and is supposed to
* mark the start of kernel text.
*/
.globl kernel_text
kernel_text:
/*
* Startup entry. Note, this must be the first thing in the text
* segment!
*/
.text
ASENTRY(__start)
li 8,0
li 9,0x100
mtctr 9
1:
dcbf 0,8
icbi 0,8
addi 8,8,0x20
bdnz 1b
sync
isync
/* Save the argument pointer and length */
mr 20,6
mr 21,7
lis 8,openfirmware_entry@ha
std 5,openfirmware_entry@l(8) /* save client interface handler */
/* Set up the stack pointer */
lis 1,(tmpstk+TMPSTKSZ-48)@ha
addi 1,1,(tmpstk+TMPSTKSZ-48)@l
/* Set up the TOC pointer */
lis 2,tocbase@ha
ld 2,tocbase@l(2)
mfmsr 0
lis 9,ofmsr@ha
stdu 0,ofmsr@l(9)
mfsprg0 0 /* save SPRG0-3 */
std 0,8(9) /* ofmsr[1] = sprg0 */
mfsprg1 0
std 0,16(9) /* ofmsr[2] = sprg1 */
mfsprg2 0
std 0,24(9) /* ofmsr[3] = sprg2 */
mfsprg3 0
std 0,32(9) /* ofmsr[4] = sprg3 */
/* Switch to 64-bit mode */
mfmsr 9
li 8,1
insrdi 9,8,1,0
mtmsrd 9
bl .OF_initial_setup
nop
lis 4,end@ha
addi 4,4,end@l
mr 5,4
lis 3,kernbase@ha
addi 3,3,kernbase@l
/* Restore the argument pointer and length */
mr 6,20
mr 7,21
bl .powerpc_init
nop
mr %r1, %r3
li %r3, 0
std %r3, 0(%r1)
bl .mi_startup
nop
b .OF_exit
nop
/*
* PPC64 ABI TOC base
*/
.align 3
.globl tocbase
tocbase:
.llong .TOC.@tocbase
/*
* Open Firmware Real-mode Entry Point. This is a huge pain.
*/
ASENTRY(ofw_32bit_mode_entry)
mflr %r0
std %r0,16(%r1)
stdu %r1,-208(%r1)
/*
* We need to save the following, because OF's register save/
* restore code assumes that the contents of registers are
* at most 32 bits wide: lr, cr, r2, r13-r31, the old MSR. These
* get placed in that order in the stack.
*/
mfcr %r4
std %r4,48(%r1)
std %r13,56(%r1)
std %r14,64(%r1)
std %r15,72(%r1)
std %r16,80(%r1)
std %r17,88(%r1)
std %r18,96(%r1)
std %r19,104(%r1)
std %r20,112(%r1)
std %r21,120(%r1)
std %r22,128(%r1)
std %r23,136(%r1)
std %r24,144(%r1)
std %r25,152(%r1)
std %r26,160(%r1)
std %r27,168(%r1)
std %r28,176(%r1)
std %r29,184(%r1)
std %r30,192(%r1)
std %r31,200(%r1)
/* Record the old MSR */
mfmsr %r6
/* read client interface handler */
lis %r4,openfirmware_entry@ha
ld %r4,openfirmware_entry@l(%r4)
/*
* Set the MSR to the OF value. This has the side effect of disabling
* exceptions, which is important for the next few steps.
*/
lis %r5,ofmsr@ha
ld %r5,ofmsr@l(%r5)
mtmsrd %r5
isync
/*
* Set up OF stack. This needs to be accessible in real mode and
* use the 32-bit ABI stack frame format. The pointer to the current
* kernel stack is placed at the very top of the stack along with
* the old MSR so we can get them back later.
*/
mr %r5,%r1
lis %r1,(ofwstk+OFWSTKSZ-32)@ha
addi %r1,%r1,(ofwstk+OFWSTKSZ-32)@l
std %r5,8(%r1) /* Save real stack pointer */
std %r2,16(%r1) /* Save old TOC */
std %r6,24(%r1) /* Save old MSR */
li %r5,0
stw %r5,4(%r1)
stw %r5,0(%r1)
/* Finally, branch to OF */
mtctr %r4
bctrl
/* Reload stack pointer and MSR from the OFW stack */
ld %r6,24(%r1)
ld %r2,16(%r1)
ld %r1,8(%r1)
/* Now set the real MSR */
mtmsrd %r6
isync
/* Sign-extend the return value from OF */
extsw %r3,%r3
/* Restore all the non-volatile registers */
ld %r5,48(%r1)
mtcr %r5
ld %r13,56(%r1)
ld %r14,64(%r1)
ld %r15,72(%r1)
ld %r16,80(%r1)
ld %r17,88(%r1)
ld %r18,96(%r1)
ld %r19,104(%r1)
ld %r20,112(%r1)
ld %r21,120(%r1)
ld %r22,128(%r1)
ld %r23,136(%r1)
ld %r24,144(%r1)
ld %r25,152(%r1)
ld %r26,160(%r1)
ld %r27,168(%r1)
ld %r28,176(%r1)
ld %r29,184(%r1)
ld %r30,192(%r1)
ld %r31,200(%r1)
/* Restore the stack and link register */
ld %r1,0(%r1)
ld %r0,16(%r1)
mtlr %r0
blr
/*
* int setfault()
*
* Similar to setjmp to setup for handling faults on accesses to user memory.
* Any routine using this may only call bcopy, either the form below,
* or the (currently used) C code optimized, so it doesn't use any non-volatile
* registers.
*/
ASENTRY(setfault)
mflr 0
mfcr 12
mfsprg 4,0
ld 4,PC_CURTHREAD(4)
ld 4,TD_PCB(4)
std 3,PCB_ONFAULT(4)
std 0,0(3)
std 1,8(3)
std 2,16(3)
std %r12,24(%r3) /* Save the non-volatile GP regs. */
std %r13,24+1*8(%r3)
std %r14,24+2*8(%r3)
std %r15,24+3*8(%r3)
std %r16,24+4*8(%r3)
std %r17,24+5*8(%r3)
std %r18,24+6*8(%r3)
std %r19,24+7*8(%r3)
std %r20,24+8*8(%r3)
std %r21,24+9*8(%r3)
std %r22,24+10*8(%r3)
std %r23,24+11*8(%r3)
std %r24,24+12*8(%r3)
std %r25,24+13*8(%r3)
std %r26,24+14*8(%r3)
std %r27,24+15*8(%r3)
std %r28,24+16*8(%r3)
std %r29,24+17*8(%r3)
std %r30,24+18*8(%r3)
std %r31,24+19*8(%r3)
xor 3,3,3
blr
#include <powerpc/aim/trap_subr64.S>
|
