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68 lines
1.3 KiB
68 lines
1.3 KiB
20 years ago
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/*
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* Copyright (C) Paul Mackerras 1997.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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.text
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/*
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* Use the BAT2 & 3 registers to map the 1st 16MB of RAM to
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* the address given as the 1st argument.
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*/
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.globl setup_bats
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setup_bats:
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mfpvr 5
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rlwinm 5,5,16,16,31 /* r3 = 1 for 601, 4 for 604 */
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cmpwi 0,5,1
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li 0,0
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bne 4f
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mtibatl 3,0 /* invalidate BAT first */
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ori 3,3,4 /* set up BAT registers for 601 */
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li 4,0x7f
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mtibatu 2,3
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mtibatl 2,4
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oris 3,3,0x80
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oris 4,4,0x80
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mtibatu 3,3
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mtibatl 3,4
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b 5f
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4: mtdbatu 3,0 /* invalidate BATs first */
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mtibatu 3,0
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ori 3,3,0xff /* set up BAT registers for 604 */
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li 4,2
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mtdbatl 2,4
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mtdbatu 2,3
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mtibatl 2,4
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mtibatu 2,3
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oris 3,3,0x80
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oris 4,4,0x80
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mtdbatl 3,4
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mtdbatu 3,3
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mtibatl 3,4
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mtibatu 3,3
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5: sync
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isync
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blr
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/*
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* Flush the dcache and invalidate the icache for a range of addresses.
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*
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* flush_cache(addr, len)
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*/
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.global flush_cache
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flush_cache:
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addi 4,4,0x1f /* len = (len + 0x1f) / 0x20 */
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rlwinm. 4,4,27,5,31
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mtctr 4
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beqlr
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1: dcbf 0,3
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icbi 0,3
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addi 3,3,0x20
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bdnz 1b
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sync
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isync
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blr
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