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# =============================================================================
# * Copyright (c) 2004, 2005 IBM Corporation
# * All rights reserved.
# * This program and the accompanying materials
# * are made available under the terms of the BSD License
# * which accompanies this distribution, and is available at
# * http://www.opensource.org/licenses/bsd-license.php
# *
# * Contributors:
# * IBM Corporation - initial implementation
# =============================================================================
#
# The entry points into the engine, as well as everything else in low memory.
#
.section ".slof.vectors","ax"
. = 0
.asciz "SLOF, the SlimLine Open Firmware"
#
# The reset exception.
#
. = 0x0100
mtsprg 0,0
li 0,0x0100
b handler
#
# All other exceptions.
#
.irp i, 0x0200,0x0300,0x0380,0x0400,0x0480,0x0500,0x0600,0x0700, \
0x0800,0x0900,0x0a00,0x0b00,0x0c00,0x0d00,0x0e00,0x0f00, \
0x1000,0x1100,0x1200,0x1300,0x1400,0x1500,0x1600,0x1700, \
0x1800,0x1900,0x1a00,0x1b00,0x1c00,0x1d00,0x1e00,0x1f00, \
0x2000,0x2100,0x2200,0x2300,0x2400,0x2500,0x2600,0x2700, \
0x2800,0x2900,0x2a00,0x2b00,0x2c00,0x2d00,0x2e00,0x2f00
. = \i
mtsprg 0,0 ; li 0,\i ; b handler
.endr
#
# The generic exception code.
#
# Enter with GPR0 = vector, SPRG0 = saved GPR0.
#
. = 0x3000
handler:
mtsprg 1,1 # SPRG1 = saved GPR1
lis 1,0x0110 # GPR1 = address of register save area
.irp i, 2,3,4,5,6,7,8,9,10,11,12,13,14,15, \
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
std \i,\i*8(1)
.endr # save GPR2..GPR31
mr 3,0 # GPR3 = vector
mfsprg 0,0 ; std 0,0(1) # save GPR0
mfsprg 0,1 ; std 0,8(1) # save GPR1
mfcr 0 ; std 0,0x100(1)
mfxer 0 ; std 0,0x108(1)
mflr 0 ; std 0,0x110(1)
mfctr 0 ; std 0,0x118(1)
mfsrr0 0 ; std 0,0x120(1)
mfsrr1 0 ; std 0,0x128(1)
mfdar 0 ; std 0,0x130(1)
mfdsisr 0 ; std 0,0x138(1) # save special regs
addi 1,1,0x7000 ; li 0,0 ; stdu 0,-16(1) # set up stack
lis 2,engine@ha ; ld 2,8+engine@l(2) # set up TOC pointer
b .engine # ...and go!
#
# Swap non-volatile client interface regs, plus GPR3..GPR7.
#
swap_ci_regs:
lis 8,0x0110
addi 8,8,0x0400
.irp i, 1,2,3,4,5,6,7, \
13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
ld 0,\i*8(8)
std \i,\i*8(8)
mr \i,0
.endr # swap GPR1..7, GPR13..31
ld 0,0x100(8) ; mfcr 9 ; mtcrf 0xff,0 ; std 9,0x100(8) # swap CR
ld 0,0x128(8) ; mfmsr 9 ; mtmsrd 0 ; sync ; isync ; std 9,0x128(8)
# swap MSR
blr
#
# Entry point for the OF client interface.
#
.globl client_entry_point
.section ".opd","aw"
.align 3
client_entry_point:
.quad .client_entry_point,.TOC.@tocbase,0
.previous
.type .client_entry_point,@function
.globl .client_entry_point
.client_entry_point:
mflr 4 ; bl swap_ci_regs ; mtlr 4 ; li 3,0 ; blr
#
# Start the client.
#
.globl call_client
.section ".opd","aw"
.align 3
call_client:
.quad .call_client,.TOC.@tocbase,0
.previous
.type .call_client,@function
.globl .call_client
.call_client: # called with GPR3 = address, returns GPR3
mflr 4 ; mtctr 3 ; bl swap_ci_regs ; bctrl
bl swap_ci_regs ; mtlr 4 ; li 3,-1 ; blr
.globl flush_cache
.section ".opd","aw"
.align 3
flush_cache:
.quad .flush_cache,.TOC.@tocbase,0
.previous
.type .flush_cache,@function
.globl .flush_cache
.flush_cache: # flush at GPR3 size GPR4
add 4,4,3
addi 4,4,127
rlwinm 3,3,0,0,24
rlwinm 4,4,0,0,24
sub 4,4,3
srwi 4,4,7
mtctr 4
0:
dcbst 0,3
sync
icbi 0,3
sync
isync
addi 3,3,128
bdnz 0b
blr
#
# This is where the secondary CPUs sit and wait.
#
. = 0x3f00
slaveloop:
lis 0,10
mtctr 0
bdnz $ # do some waiting, to prevent flooding the buses
lwz 0,0x3f40(0)
and. 0,0,0
beq $-20 # wait for our flag
lwz 0,0x3f80(0)
lwz 3,0x3fc0(0)
mtctr 0
bctr # jump to specified address, with specified GPR3
. = 0x3fff
.byte 0x36 # to fill out to exactly 16kB
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