211 lines
5.3 KiB
ArmAsm
211 lines
5.3 KiB
ArmAsm
/* $NetBSD: srt0.s,v 1.1 2000/08/20 14:58:42 mrg Exp $ */
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/*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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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#include <machine/psl.h>
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#include <machine/param.h>
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#include <machine/frame.h>
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#include <machine/asm.h>
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/*
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* Globals
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*/
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.globl _esym
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.data
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_esym: .word 0 /* end of symbol table */
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.globl _C_LABEL(romp)
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.align 8
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_C_LABEL(romp): .xword 0 /* openfirmware entry point */
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/*
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* Startup entry
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*/
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.text
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.globl _start, _C_LABEL(kernel_text)
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_C_LABEL(kernel_text) = _start
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_start:
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nop ! For some reason this is needed to fixup the text section
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/*
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* Step 1: Save rom entry pointer -- NOTE this probably needs to change
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*/
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mov %o4, %g7 ! save prom vector pointer
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set _C_LABEL(romp), %g1
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stx %o4, [%g1] ! It's initialized data, I hope
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/*
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* Start by creating a stack for ourselves.
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*/
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#ifdef _LP64
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/* 64-bit stack */
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btst 1, %sp
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set CC64FSZ, %g1 ! Frame Size (negative)
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bnz 1f
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set BIAS, %g2 ! Bias (negative)
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andn %sp, 0x0f, %sp ! 16 byte align, per ELF spec.
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add %g1, %g2, %g1 ! Frame + Bias
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1:
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sub %sp, %g1, %g1
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save %g1, %g0, %sp
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#else
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/* 32-bit stack */
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btst 1, %sp
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set CC64FSZ, %g1 ! Frame Size (negative)
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bz 1f
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set BIAS, %g2
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sub %g1, %g2, %g1
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1:
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sub %sp, %g1, %g1 ! This is so we properly sign-extend things
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andn %g1, 0x7, %g1
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save %g1, %g0, %sp
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#endif
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! mov %i0, %i4 ! Apparenty we get our CIF in i0
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/*
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* Set the psr into a known state:
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* Set supervisor mode, interrupt level >= 13, traps enabled
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*/
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wrpr %g0, 0, %pil ! So I lied
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wrpr %g0, PSTATE_PRIV+PSTATE_IE, %pstate
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clr %g4 ! Point %g4 to start of data segment
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! only problem is that apparently the
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! start of the data segment is 0
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/*
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* XXXXXXXX Need to determine what params are passed
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*/
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call _C_LABEL(setup)
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nop
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mov %i1, %o1
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call _C_LABEL(main)
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mov %i2, %o0
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call _C_LABEL(exit)
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nop
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call _C_LABEL(_rtt)
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nop
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/*
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* void syncicache(void* start, int size)
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*
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* I$ flush. Really simple. Just flush over the whole range.
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*/
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.align 8
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.globl _C_LABEL(syncicache)
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_C_LABEL(syncicache):
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dec 4, %o1
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flush %o0
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brgz,a,pt %o1, _C_LABEL(syncicache)
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inc 4, %o0
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retl
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nop
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/*
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* openfirmware(cell* param);
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*
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* OpenFirmware entry point
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*
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* If we're running in 32-bit mode we need to convert to a 64-bit stack
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* and 64-bit cells. The cells we'll allocate off the stack for simplicity.
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*/
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.align 8
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.globl _C_LABEL(openfirmware)
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.proc 1
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FTYPE(openfirmware)
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_C_LABEL(openfirmware):
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andcc %sp, 1, %g0
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bz,pt %icc, 1f
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sethi %hi(_C_LABEL(romp)), %o1
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ldx [%o1+%lo(_C_LABEL(romp))], %o4 ! v9 stack, just load the addr and callit
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save %sp, -CC64FSZ, %sp
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mov %i0, %o0 ! Copy over our parameter
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mov %g1, %l1
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mov %g2, %l2
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mov %g3, %l3
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mov %g4, %l4
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mov %g5, %l5
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mov %g6, %l6
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mov %g7, %l7
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rdpr %pstate, %l0
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jmpl %i4, %o7
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wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate
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wrpr %l0, %g0, %pstate
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mov %l1, %g1
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mov %l2, %g2
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mov %l3, %g3
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mov %l4, %g4
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mov %l5, %g5
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mov %l6, %g6
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mov %l7, %g7
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ret
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restore %o0, %g0, %o0
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1: ! v8 -- need to screw with stack & params
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save %sp, -CC64FSZ, %sp ! Get a new 64-bit stack frame
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add %sp, -BIAS, %sp
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sethi %hi(_C_LABEL(romp)), %o1
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rdpr %pstate, %l0
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ldx [%o1+%lo(_C_LABEL(romp))], %o1 ! Do the actual call
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srl %sp, 0, %sp
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mov %i0, %o0
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mov %g1, %l1
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mov %g2, %l2
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mov %g3, %l3
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mov %g4, %l4
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mov %g5, %l5
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mov %g6, %l6
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mov %g7, %l7
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jmpl %o1, %o7
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wrpr %g0, PSTATE_PROM|PSTATE_IE, %pstate ! Enable 64-bit addresses for the prom
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wrpr %l0, 0, %pstate
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mov %l1, %g1
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mov %l2, %g2
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mov %l3, %g3
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mov %l4, %g4
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mov %l5, %g5
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mov %l6, %g6
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mov %l7, %g7
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ret
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restore %o0, %g0, %o0
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#if 0
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.data
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.align 8
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bootstack:
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#define STACK_SIZE 0x14000
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.skip STACK_SIZE
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ebootstack: ! end (top) of boot stack
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#endif
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