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913 decky 1
#
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# Copyright (C) 2006 Martin Decky
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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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#
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# - 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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# - 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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# - The name of the author 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 THE AUTHOR ``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 THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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1058 decky 29
#include "asm.h"
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#include "regname.h"
1478 decky 31
#include "debug.inc"
913 decky 32
 
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.text
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1058 decky 35
.global halt
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.global memcpy
913 decky 37
.global jump_to_kernel
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1058 decky 39
halt:
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	b halt
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1075 decky 42
memcpy:
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	srwi. r7, r5, 3
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	addi r6, r3, -4
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	addi r4, r4, -4
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	beq	2f
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	andi. r0, r6, 3
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	mtctr r7
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	bne 5f
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	1:
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	lwz r7, 4(r4)
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	lwzu r8, 8(r4)
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	stw r7, 4(r6)
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	stwu r8, 8(r6)
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	bdnz 1b
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	andi. r5, r5, 7
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	2:
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	cmplwi 0, r5, 4
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	blt 3f
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	lwzu r0, 4(r4)
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	addi r5, r5, -4
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	stwu r0, 4(r6)
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	3:
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	cmpwi 0, r5, 0
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	beqlr
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	mtctr r5
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	addi r4, r4, 3
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	addi r6, r6, 3
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	4:
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	lbzu r0, 1(r4)
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	stbu r0, 1(r6)
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	bdnz 4b
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	blr
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	5:
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	subfic r0, r0, 4
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	mtctr r0
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	6:
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	lbz r7, 4(r4)
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	addi r4, r4, 1
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	stb r7, 4(r6)
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	addi r6, r6, 1
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	bdnz 6b
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	subf r5, r0, r5
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	rlwinm. r7, r5, 32-3, 3, 31
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	beq 2b
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	mtctr r7
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	b 1b
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913 decky 105
jump_to_kernel:
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	# r3 = bootinfo (pa)
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	# r4 = bootinfo_size
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	# r5 = trans (pa)
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	# r6 = bytes to copy
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	# r7 = real_mode (pa)
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	# r8 = framebuffer (pa)
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	# r9 = scanline
1022 decky 114
 
1216 decky 115
	# disable interrupts
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	mfmsr r31
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	rlwinm r31, r31, 0, 17, 15
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	mtmsr r31
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	# set real_mode meeting point address
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	mtspr srr0, r7
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	# jumps to real_mode
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1058 decky 127
	mfmsr r31
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	lis r30, ~0@h
1478 decky 129
	ori r30, r30, ~(msr_ir | msr_dr | msr_ee)@l
1058 decky 130
	and r31, r31, r30
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	mtspr srr1, r31
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	sync
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	isync
1022 decky 135
	rfi
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.section REALMODE, "ax"
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.align PAGE_WIDTH
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.global real_mode
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real_mode:
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	DEBUG_INIT
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	DEBUG_real_mode
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	# copy kernel to proper location
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	#
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	# r5 = trans (pa)
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	# r6 = bytes to copy
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	# r8 = framebuffer (pa)
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	# r9 = scanline
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	li r31, PAGE_SIZE >> 2
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	li r30, 0
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	page_copy:
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		cmpwi r6, 0
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		beq copy_end
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1068 decky 161
		# copy page
1058 decky 162
 
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		mtctr r31
1131 decky 164
		lwz r29, 0(r5)
1058 decky 165
 
1479 decky 166
		DEBUG_INIT
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		DEBUG_copy_loop
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1058 decky 169
		copy_loop:
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			lwz r28, 0(r29)
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			stw r28, 0(r30)
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			addi r29, r29, 4
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			addi r30, r30, 4
1131 decky 176
			subi r6, r6, 4
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			cmpwi r6, 0
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			beq copy_end
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1058 decky 181
			bdnz copy_loop
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			DEBUG_end_copy_loop
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		addi r5, r5, 4
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		b page_copy
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	copy_end:
1068 decky 189
 
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	DEBUG_segments
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	# initially fill segment registers
1728 decky 193
 
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	li r31, 0
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196
	li r29, 8
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	mtctr r29
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	li r30, 0
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	seg_fill_uspace:
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		mtsrin r30, r31
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		addi r30, r30, 1
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		addis r31, r31, 0x1000    # move to next SR
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		bdnz seg_fill_uspace
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1728 decky 208
	li r29, 8
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	mtctr r29
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	lis r30, 0x4000
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	ori r30, r30, 8
1728 decky 212
 
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	seg_fill_kernel:
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215
		mtsrin r30, r31
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		addi r30, r30, 1
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		addis r31, r31, 0x1000    # move to next SR
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219
		bdnz seg_fill_kernel
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	# invalidate block address translation registers
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1479 decky 223
	DEBUG_bat
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1373 decky 225
	li r30, 0
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1068 decky 227
	mtspr ibat0u, r30
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	mtspr ibat0l, r30
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230
	mtspr ibat1u, r30
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	mtspr ibat1l, r30
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	mtspr ibat2u, r30
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	mtspr ibat2l, r30
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	mtspr ibat3u, r30
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	mtspr ibat3l, r30
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	mtspr dbat0u, r30
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	mtspr dbat0l, r30
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	mtspr dbat1u, r30
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	mtspr dbat1l, r30
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	mtspr dbat2u, r30
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	mtspr dbat2l, r30
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	mtspr dbat3u, r30
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	mtspr dbat3l, r30
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	# create empty page hash table FIXME
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253
	DEBUG_pht
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255
	lis r31, 0x07ff
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	ori r31, r31, 0x0000
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1728 decky 258
	li r30, 0x4000
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	li r29, 0
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261
	pht_clear:
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263
		stw r29, 0(r31)
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265
		addi r31, r31, 4
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		subi r30, r30, 4
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268
		cmpwi r30, 0
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		beq clear_end
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271
		bdnz pht_clear
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273
		DEBUG_end_pht_clear
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275
	clear_end:
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277
	lis r31, 0x07ff
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	ori r31, r31, 0x0000
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1725 decky 280
	mtsdr1 r31
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1058 decky 282
	# create identity mapping
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1728 decky 284
#ifdef CONFIG_BAT
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1479 decky 286
	DEBUG_mapping
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1068 decky 288
	# FIXME: map exactly the size of RAM
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290
	lis r31, 0x8000
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	ori r31, r31, 0x0ffe
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293
	lis r30, 0x0000
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	ori r30, r30, 0x0002
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296
	mtspr ibat0u, r31
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	mtspr ibat0l, r30
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299
	mtspr dbat0u, r31
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	mtspr dbat0l, r30
1728 decky 301
 
302
#endif
1068 decky 303
 
1479 decky 304
	DEBUG_tlb
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1058 decky 306
	tlbia
1381 decky 307
	tlbsync
1058 decky 308
 
1479 decky 309
	DEBUG_prepare
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1058 decky 311
	# start the kernel
1022 decky 312
	#
1728 decky 313
	# pc = KERNEL_START_ADDR
1131 decky 314
	# r3 = bootinfo (pa)
1728 decky 315
	# sprg0 = KA2PA(KERNEL_START_ADDR)
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	# sprg3 = physical memory size
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	# sp = 0 (pa)
1022 decky 318
 
1058 decky 319
	lis r31, KERNEL_START_ADDR@ha
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	addi r31, r31, KERNEL_START_ADDR@l
1022 decky 321
 
1058 decky 322
	mtspr srr0, r31
1022 decky 323
 
1728 decky 324
	subis r31, r31, 0x8000
325
	mtsprg0 r31
326
 
327
	lwz r31, 0(r3)
328
	mtsprg3 r31
329
 
330
	li sp, 0
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1058 decky 332
	mfmsr r31
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	ori r31, r31, (msr_ir | msr_dr)@l
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	mtspr srr1, r31
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1146 decky 336
	sync
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	isync
1478 decky 338
 
339
	DEBUG_rfi
1022 decky 340
	rfi
1058 decky 341
 
342
.align PAGE_WIDTH
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.global trans
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trans:
345
	.space (TRANS_SIZE * TRANS_ITEM_SIZE)