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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 "opt_ddb.h"
#include "opt_ipkdb.h"
#include "assym.s"
#include <sys/syscall.h>
#include <machine/trap.h>
#include <machine/param.h>
#include <machine/sr.h>
#include <machine/spr.h>
#include <machine/psl.h>
#include <machine/asm.h>
/*
* Some instructions gas doesn't understand (yet?)
*/
#define bdneq bdnzf 2,
/*
* Globals
*/
.data
GLOBAL(tmpstk)
.space 8208
GLOBAL(esym)
.long 0 /* end of symbol table */
GLOBAL(proc0paddr)
.long 0 /* proc0 p_addr */
GLOBAL(PTmap)
.long 0 /* PTmap */
GLOBAL(decrnest)
.long 0
GLOBAL(intrnames)
.asciz "irq0", "irq1", "irq2", "irq3"
.asciz "irq4", "irq5", "irq6", "irq7"
.asciz "irq8", "irq9", "irq10", "irq11"
.asciz "irq12", "irq13", "irq14", "irq15"
.asciz "irq16", "irq17", "irq18", "irq19"
.asciz "irq20", "irq21", "irq22", "irq23"
.asciz "irq24", "irq25", "irq26", "irq27"
.asciz "irq28", "irq29", "irq30", "irq31"
.asciz "irq32", "irq33", "irq34", "irq35"
.asciz "irq36", "irq37", "irq38", "irq39"
.asciz "irq40", "irq41", "irq42", "irq43"
.asciz "irq44", "irq45", "irq46", "irq47"
.asciz "irq48", "irq49", "irq50", "irq51"
.asciz "irq52", "irq53", "irq54", "irq55"
.asciz "irq56", "irq57", "irq58", "irq59"
.asciz "irq60", "irq61", "irq62", "irq63"
.asciz "clock", "softclock", "softnet", "softserial"
GLOBAL(eintrnames)
.align 4
GLOBAL(intrcnt)
.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.long 0,0,0,0
GLOBAL(eintrcnt)
GLOBAL(ofmsr)
.long 0 /* msr used in Open Firmware */
GLOBAL(powersave)
.long 0
#define INTSTK 8192 /* 8K interrupt stack */
#define SPILLSTK 4096 /* 4K spill stack */
/*
* File-scope for locore.S
*/
idle_u:
.long 0 /* fake uarea during idle after exit */
openfirmware_entry:
.long 0 /* openfirmware entry point */
srsave:
.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
/*
* This symbol is here for the benefit of kvm_mkdb, and is supposed to
* mark the start of kernel text.
*/
.text
.globl kernel_text
kernel_text:
/*
* Startup entry. Note, this must be the first thing in the text
* segment!
*/
.text
.globl __start
__start:
#ifdef FIRMWORKSBUGS
mfmsr 0
andi. 0,0,PSL_IR|PSL_DR
beq 1f
bl ofwr_init
1:
#endif
li 8,0
li 9,0x100
mtctr 9
1:
dcbf 0,8
icbi 0,8
addi 8,8,0x20
bdnz 1b
sync
isync
mtibatu 0,0
mtibatu 1,0
mtibatu 2,0
mtibatu 3,0
mtdbatu 0,0
mtdbatu 1,0
mtdbatu 2,0
mtdbatu 3,0
li 9,0x12
mtibatl 0,9
mtdbatl 0,9
li 9,0x1ffe
mtibatu 0,9
mtdbatu 0,9
isync
lis 8,openfirmware_entry@ha
stw 5,openfirmware_entry@l(8) /* save client interface handler */
mr 3,5
lis 1,tmpstk@ha
addi 1,1,tmpstk@l
addi 1,1,8192
mfmsr 0
lis 9,ofmsr@ha
stw 0,ofmsr@l(9)
bl OF_init
lis 4,end@ha
addi 4,4,end@l
mr 5,4
li 9,PAGE_MASK
add 4,4,9
andc 4,4,9
lis 9,OF_buf@ha
stw 4,OF_buf@l(9)
addi 4,4,PAGE_SIZE
lis 9,proc0paddr@ha
stw 4,proc0paddr@l(9)
addi 4,4,USPACE-FRAMELEN
mr 1,4
xor 0,0,0
stwu 0,-16(1)
lis 3,kernel_text@ha
addi 3,3,kernel_text@l
#if 0
mr 5,6
#endif
bl powerpc_init
bl mi_startup
b OF_exit
#if 0 /* XXX: We may switch back to this in the future. */
/*
* OpenFirmware entry point
*/
ENTRY(openfirmware)
mflr 0 /* save return address */
stw 0,4(1)
stwu 1,-16(1) /* setup stack frame */
mfmsr 4 /* save msr */
stw 4,8(1)
lis 4,openfirmware_entry@ha /* get firmware entry point */
lwz 4,openfirmware_entry@l(4)
mtlr 4
li 0,0 /* clear battable translations */
mtdbatu 2,0
mtdbatu 3,0
mtibatu 2,0
mtibatu 3,0
lis 4,ofmsr@ha /* Open Firmware msr */
lwz 4,ofmsr@l(4)
mtmsr 4
isync
lis 4,srsave@ha /* save old SR */
addi 4,4,srsave@l
li 5,0
1: mfsrin 0,5
stw 0,0(4)
addi 4,4,4
addis 5,5,0x10000000@h
cmpwi 5,0
bne 1b
lis 4,ofw_pmap@ha /* load OFW SR */
addi 4,4,ofw_pmap@l
lwz 0,PM_KERNELSR(4)
cmpwi 0,0 /* pm_sr[KERNEL_SR] == 0? */
beq 2f /* then skip (not initialized yet) */
li 5,0
1: lwz 0,0(4)
mtsrin 0,5
addi 4,4,4
addis 5,5,0x10000000@h
cmpwi 5,0
bne 1b
2:
blrl /* call Open Firmware */
mfmsr 4
li 5,PSL_IR|PSL_DR
andc 4,4,5
mtmsr 4
isync
lis 4,srsave@ha /* restore saved SR */
addi 4,4,srsave@l
li 5,0
1: lwz 0,0(4)
mtsrin 0,5
addi 4,4,4
addis 5,5,0x10000000@h
cmpwi 5,0
bne 1b
lwz 4,8(1) /* restore msr */
mtmsr 4
isync
lwz 1,0(1) /* and return */
lwz 0,4(1)
mtlr 0
blr
#endif
/*
* Switch to/from OpenFirmware real mode stack
*
* Note: has to be called as the very first thing in OpenFirmware interface
* routines.
* E.g.:
* int
* OF_xxx(arg1, arg2)
* type arg1, arg2;
* {
* static struct {
* char *name;
* int nargs;
* int nreturns;
* char *method;
* int arg1;
* int arg2;
* int ret;
* } args = {
* "xxx",
* 2,
* 1,
* };
*
* ofw_stack();
* args.arg1 = arg1;
* args.arg2 = arg2;
* if (openfirmware(&args) < 0)
* return -1;
* return args.ret;
* }
*/
.local firmstk
.comm firmstk,PAGE_SIZE,8
ENTRY(ofw_stack)
mfmsr 8 /* turn off interrupts */
andi. 0,8,~(PSL_EE|PSL_RI)@l
mtmsr 0
stw 8,4(1) /* abuse return address slot */
lwz 5,0(1) /* get length of stack frame */
subf 5,1,5
lis 7,firmstk+PAGE_SIZE-8@ha
addi 7,7,firmstk+PAGE_SIZE-8@l
lis 6,ofw_back@ha
addi 6,6,ofw_back@l
subf 4,5,7 /* make room for stack frame on
new stack */
stw 6,-4(7) /* setup return pointer */
stwu 1,-8(7)
stw 7,-8(4)
addi 3,1,8
addi 1,4,-8
subi 5,5,8
cmpw 3,4
beqlr
mr 0,5
addi 5,5,-1
cmpwi 0,0
beqlr
1: lwz 0,0(3)
stw 0,0(4)
addi 3,3,1
addi 4,4,1
mr 0,5
addi 5,5,-1
cmpwi 0,0
bne 1b
blr
ofw_back:
lwz 1,0(1) /* get callers original stack pointer */
lwz 0,4(1) /* get saved msr from abused slot */
mtmsr 0
lwz 1,0(1) /* return */
lwz 0,4(1)
mtlr 0
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.
*/
.globl setfault
setfault:
mflr 0
mfcr 12
mfsprg 4,0
lwz 4,PC_CURTHREAD(4)
lwz 4,TD_PCB(4)
stw 3,PCB_ONFAULT(4)
stw 0,0(3)
stw 1,4(3)
stw 2,8(3)
stmw 12,12(3)
xor 3,3,3
blr
#include <powerpc/powerpc/trap_subr.S>
|
