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53 lines
1.3 KiB
ArmAsm
53 lines
1.3 KiB
ArmAsm
# Copyright 2008-2009 Segher Boessenkool <segher@kernel.crashing.org>
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# This code is licensed to you under the terms of the GNU GPL, version 2;
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# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
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.globl _start
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_start:
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# Disable interrupts, enable FP.
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mfmsr 3 ; rlwinm 3,3,0,17,15 ; ori 3,3,0x2000 ; mtmsr 3 ; isync
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# Setup stack.
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lis 1,_stack_top@ha ; addi 1,1,_stack_top@l ; li 0,0 ; stwu 0,-64(1)
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# Clear BSS.
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lis 3,__bss_start@ha ; addi 3,3,__bss_start@l
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li 4,0
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lis 5,__bss_end@ha ; addi 5,5,__bss_end@l ; sub 5,5,3
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bl memset
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# set [DI]BAT0 for 256MB@80000000,
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# real 00000000, WIMG=0000, R/W
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li 3,2 ; lis 4,0x8000 ; ori 4,4,0x1fff
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mtspr 529,3 ; mtspr 528,4 ; mtspr 537,3 ; mtspr 536,4 ; isync
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# set [DI]BAT4 for 256MB@90000000,
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# real 10000000, WIMG=0000, R/W
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addis 3,3,0x1000 ; addis 4,4,0x1000
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mtspr 561,3 ; mtspr 560,4 ; mtspr 569,3 ; mtspr 568,4 ; isync
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# set DBAT1 for 256MB@c0000000,
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# real 00000000, WIMG=0101, R/W
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li 3,0x2a ; lis 4,0xc000 ; ori 4,4,0x1fff
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mtspr 539,3 ; mtspr 538,4 ; isync
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# set DBAT5 for 256MB@d0000000,
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# real 10000000, WIMG=0101, R/W
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addis 3,3,0x1000 ; addis 4,4,0x1000
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mtspr 571,3 ; mtspr 570,4 ; isync
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# enable [DI]BAT4-7 in HID4
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lis 3, 0x8200
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mtspr 1011,3
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# Go!
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bl main
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# If it returns, hang. Shouldn't happen.
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b .
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