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#
# Copyright (c) 2006 Martin Decky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# - 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.
# - The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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 "asm.h"
#include "regname.h"
.text
.global halt
.global memcpy
.global jump_to_kernel
halt:
b halt
memcpy:
srwi. r7, r5, 3
addi r6, r3, -4
addi r4, r4, -4
beq 2f
andi. r0, r6, 3
mtctr r7
bne 5f
1:
lwz r7, 4(r4)
lwzu r8, 8(r4)
stw r7, 4(r6)
stwu r8, 8(r6)
bdnz 1b
andi. r5, r5, 7
2:
cmplwi 0, r5, 4
blt 3f
lwzu r0, 4(r4)
addi r5, r5, -4
stwu r0, 4(r6)
3:
cmpwi 0, r5, 0
beqlr
mtctr r5
addi r4, r4, 3
addi r6, r6, 3
4:
lbzu r0, 1(r4)
stbu r0, 1(r6)
bdnz 4b
blr
5:
subfic r0, r0, 4
mtctr r0
6:
lbz r7, 4(r4)
addi r4, r4, 1
stb r7, 4(r6)
addi r6, r6, 1
bdnz 6b
subf r5, r0, r5
rlwinm. r7, r5, 32-3, 3, 31
beq 2b
mtctr r7
b 1b
jump_to_kernel:
# r3 = bootinfo (pa)
# r4 = bootinfo_size
# r5 = trans (pa)
# r6 = bytes to copy
# r7 = real_mode (pa)
# r8 = framebuffer (pa)
# r9 = scanline
# disable interrupts
mfmsr r31
rlwinm r31, r31, 0, 17, 15
mtmsr r31
# set real_mode meeting point address
mtspr srr0, r7
# jumps to real_mode
mfmsr r31
lis r30, ~0@h
ori r30, r30, ~(msr_ir | msr_dr | msr_ee)@l
and r31, r31, r30
mtspr srr1, r31
sync
isync
rfi
.section REALMODE, "ax"
.align PAGE_WIDTH
.global real_mode
real_mode:
# copy kernel to proper location
#
# r5 = trans (pa)
# r6 = bytes to copy
# r8 = framebuffer (pa)
# r9 = scanline
li r31, PAGE_SIZE >> 2
li r30, 0
page_copy:
cmpwi r6, 0
beq copy_end
# copy page
mtctr r31
lwz r29, 0(r5)
copy_loop:
lwz r28, 0(r29)
stw r28, 0(r30)
addi r29, r29, 4
addi r30, r30, 4
subi r6, r6, 4
cmpwi r6, 0
beq copy_end
bdnz copy_loop
addi r5, r5, 4
b page_copy
copy_end:
# initially fill segment registers
li r31, 0
li r29, 8
mtctr r29
li r30, 0 # ASID 0 (VSIDs 0 .. 7)
seg_fill_uspace:
mtsrin r30, r31
addi r30, r30, 1
addis r31, r31, 0x1000 # move to next SR
bdnz seg_fill_uspace
li r29, 8
mtctr r29
lis r30, 0x4000 # priviledged access only
ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15)
seg_fill_kernel:
mtsrin r30, r31
addi r30, r30, 1
addis r31, r31, 0x1000 # move to next SR
bdnz seg_fill_kernel
# invalidate block address translation registers
li r30, 0
mtspr ibat0u, r30
mtspr ibat0l, r30
mtspr ibat1u, r30
mtspr ibat1l, r30
mtspr ibat2u, r30
mtspr ibat2l, r30
mtspr ibat3u, r30
mtspr ibat3l, r30
mtspr dbat0u, r30
mtspr dbat0l, r30
mtspr dbat1u, r30
mtspr dbat1l, r30
mtspr dbat2u, r30
mtspr dbat2l, r30
mtspr dbat3u, r30
mtspr dbat3l, r30
# create empty Page Hash Table
# on top of memory, size 64 KB
lwz r31, 0(r3) # r31 = memory size
lis r30, 65536@h
ori r30, r30, 65536@l # r30 = 65536
subi r29, r30, 1 # r29 = 65535
sub r31, r31, r30
andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536)
mtsdr1 r31
li r29, 2
srw r30, r30, r29 # r30 = 16384
li r29, 0
pht_clear:
# write zeroes
stw r29, 0(r31)
addi r31, r31, 4
subi r30, r30, 4
cmpwi r30, 0
beq clear_end
bdnz pht_clear
clear_end:
#ifdef CONFIG_BAT
# create BAT identity mapping
lwz r31, 0(r3) # r31 = memory size
lis r29, 0x0002
cmpw r31, r29
blt no_bat # less than 128 KB -> no BAT
li r29, 18
srw r31, r31, r29 # r31 = total >> 18
# create Block Length mask by replicating
# the leading logical one 14 times
li r29, 14
mtctr r31
li r29, 1
bat_mask:
srw r30, r31, r29 # r30 = mask >> 1
or r31, r31, r30 # mask = mask | r30
bdnz bat_mask
andi. r31, r31, 0x07ff # mask = mask & 0x07ff (BAT can map up to 256 MB)
li r29, 2
slw r31, r31, r29 # mask = mask << 2
ori r31, r31, 0x0002 # mask = mask | 0x0002 (priviledged access only)
lis r29, 0x8000
or r29, r29, r31
lis r30, 0x0000
ori r30, r30, 0x0002
mtspr ibat0u, r29
mtspr ibat0l, r30
mtspr dbat0u, r29
mtspr dbat0l, r30
no_bat:
#endif
tlbia
tlbsync
# start the kernel
#
# pc = KERNEL_START_ADDR
# r3 = bootinfo (pa)
# sprg0 = KA2PA(KERNEL_START_ADDR)
# sprg3 = physical memory size
# sp = 0 (pa)
lis r31, KERNEL_START_ADDR@ha
addi r31, r31, KERNEL_START_ADDR@l
mtspr srr0, r31
subis r31, r31, 0x8000
mtsprg0 r31
lwz r31, 0(r3)
mtsprg3 r31
li sp, 0
mfmsr r31
ori r31, r31, (msr_ir | msr_dr)@l
mtspr srr1, r31
sync
isync
rfi
.align PAGE_WIDTH
.global trans
trans:
.space (TRANS_SIZE * TRANS_ITEM_SIZE)