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/* $OpenBSD: srt0.s,v 1.2 2001/08/20 19:55:33 jason Exp $ */
/* $NetBSD: srt0.s,v 1.1 2000/08/20 14:58:42 mrg Exp $ */
/*
* 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 <machine/psl.h>
#include <machine/param.h>
#include <machine/frame.h>
#include <machine/asm.h>
/*
* Globals
*/
.globl _esym
.data
_esym: .word 0 /* end of symbol table */
.globl _C_LABEL(romp)
.align 8
_C_LABEL(romp): .xword 0 /* openfirmware entry point */
/*
* Startup entry
*/
.text
.globl _start, _C_LABEL(kernel_text)
_C_LABEL(kernel_text) = _start
_start:
nop ! For some reason this is needed to fixup the text section
/*
* Step 1: Save rom entry pointer -- NOTE this probably needs to change
*/
mov %o4, %g7 ! save prom vector pointer
set _C_LABEL(romp), %g1
stx %o4, [%g1] ! It's initialized data, I hope
/*
* Start by creating a stack for ourselves.
*/
#ifdef _LP64
/* 64-bit stack */
btst 1, %sp
set CC64FSZ, %g1 ! Frame Size (negative)
bnz 1f
set BIAS, %g2 ! Bias (negative)
andn %sp, 0x0f, %sp ! 16 byte align, per ELF spec.
add %g1, %g2, %g1 ! Frame + Bias
1:
sub %sp, %g1, %g1
save %g1, %g0, %sp
#else
/* 32-bit stack */
btst 1, %sp
set CC64FSZ, %g1 ! Frame Size (negative)
bz 1f
set BIAS, %g2
sub %g1, %g2, %g1
1:
sub %sp, %g1, %g1 ! This is so we properly sign-extend things
andn %g1, 0x7, %g1
save %g1, %g0, %sp
#endif
! mov %i0, %i4 ! Apparenty we get our CIF in i0
/*
* Set the psr into a known state:
* Set supervisor mode, interrupt level >= 13, traps enabled
*/
wrpr %g0, 0, %pil ! So I lied
wrpr %g0, PSTATE_PRIV+PSTATE_IE, %pstate
clr %g4 ! Point %g4 to start of data segment
! only problem is that apparently the
! start of the data segment is 0
/*
* XXXXXXXX Need to determine what params are passed
*/
call _C_LABEL(setup)
nop
mov %i1, %o1
call _C_LABEL(main)
mov %i2, %o0
call _C_LABEL(exit)
nop
call _C_LABEL(_rtt)
nop
/*
* void syncicache(void* start, int size)
*
* I$ flush. Really simple. Just flush over the whole range.
*/
.align 8
.globl _C_LABEL(syncicache)
_C_LABEL(syncicache):
dec 4, %o1
flush %o0
brgz,a,pt %o1, _C_LABEL(syncicache)
inc 4, %o0
retl
nop
/*
* openfirmware(cell* param);
*
* OpenFirmware entry point
*
* If we're running in 32-bit mode we need to convert to a 64-bit stack
* and 64-bit cells. The cells we'll allocate off the stack for simplicity.
*/
.align 8
.globl _C_LABEL(openfirmware)
.proc 1
FTYPE(openfirmware)
_C_LABEL(openfirmware):
andcc %sp, 1, %g0
bz,pt %icc, 1f
sethi %hi(_C_LABEL(romp)), %o1
ldx [%o1+%lo(_C_LABEL(romp))], %o4 ! v9 stack, just load the addr and callit
save %sp, -CC64FSZ, %sp
mov %i0, %o0 ! Copy over our parameter
mov %g1, %l1
mov %g2, %l2
mov %g3, %l3
mov %g4, %l4
mov %g5, %l5
mov %g6, %l6
mov %g7, %l7
rdpr %pstate, %l0
jmpl %i4, %o7
wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate
wrpr %l0, %g0, %pstate
mov %l1, %g1
mov %l2, %g2
mov %l3, %g3
mov %l4, %g4
mov %l5, %g5
mov %l6, %g6
mov %l7, %g7
ret
restore %o0, %g0, %o0
1: ! v8 -- need to screw with stack & params
save %sp, -CC64FSZ, %sp ! Get a new 64-bit stack frame
add %sp, -BIAS, %sp
sethi %hi(_C_LABEL(romp)), %o1
rdpr %pstate, %l0
ldx [%o1+%lo(_C_LABEL(romp))], %o1 ! Do the actual call
srl %sp, 0, %sp
mov %i0, %o0
mov %g1, %l1
mov %g2, %l2
mov %g3, %l3
mov %g4, %l4
mov %g5, %l5
mov %g6, %l6
mov %g7, %l7
jmpl %o1, %o7
wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate ! Enable 64-bit addresses for the prom
wrpr %l0, 0, %pstate
mov %l1, %g1
mov %l2, %g2
mov %l3, %g3
mov %l4, %g4
mov %l5, %g5
mov %l6, %g6
mov %l7, %g7
ret
restore %o0, %g0, %o0
#if 0
.data
.align 8
bootstack:
#define STACK_SIZE 0x14000
.skip STACK_SIZE
ebootstack: ! end (top) of boot stack
#endif
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