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https://github.com/edk2-porting/linux-next.git
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b920de1b77
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
122 lines
2.3 KiB
ArmAsm
122 lines
2.3 KiB
ArmAsm
/* Optimised simple memory fill
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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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 Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <asm/cache.h>
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.section .text
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.balign L1_CACHE_BYTES
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###############################################################################
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#
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# void *memset(void *dst, int c, size_t n)
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#
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###############################################################################
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.globl memset
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.type memset,@function
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memset:
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movm [d2,d3],(sp)
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mov d0,(12,sp)
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mov d1,(16,sp)
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mov (20,sp),d2 # count
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mov d0,a0 # dst
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mov d0,e3 # the return value
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cmp +0,d2
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beq memset_done # return if zero-length fill
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# see if the region parameters are four-byte aligned
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or d0,d2,d3
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and +3,d3
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bne memset_1 # jump if not
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extbu d1
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mov_asl d1,d3,8,d1
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or_asl d1,d3,8,d1
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or_asl d1,d3,8,d1
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or d3,d1
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# we want to transfer as much as we can in chunks of 32 bytes
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cmp +31,d2
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bls memset_4_remainder # 4-byte aligned remainder
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add -32,d2
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mov +32,d3
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memset_4_loop:
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mov d1,(a0+)
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mov d1,(a0+)
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mov d1,(a0+)
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mov d1,(a0+)
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mov d1,(a0+)
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mov d1,(a0+)
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mov d1,(a0+)
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mov d1,(a0+)
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sub d3,d2
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bcc memset_4_loop
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add d3,d2
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beq memset_4_no_remainder
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memset_4_remainder:
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# cut 4-7 words down to 0-3
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cmp +16,d2
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bcs memset_4_three_or_fewer_words
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mov d1,(a0+)
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mov d1,(a0+)
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mov d1,(a0+)
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mov d1,(a0+)
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add -16,d2
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beq memset_4_no_remainder
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# copy the remaining 1, 2 or 3 words
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memset_4_three_or_fewer_words:
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cmp +8,d2
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bcs memset_4_one_word
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beq memset_4_two_words
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mov d1,(a0+)
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memset_4_two_words:
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mov d1,(a0+)
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memset_4_one_word:
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mov d1,(a0+)
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memset_4_no_remainder:
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# check we set the correct amount
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# TODO: REMOVE CHECK
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sub e3,a0,d2
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mov (20,sp),d1
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cmp d2,d1
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beq memset_done
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break
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break
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break
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memset_done:
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mov e3,a0
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ret [d2,d3],8
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# handle misaligned copying
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memset_1:
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add -1,d2
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mov +1,d3
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setlb # setlb requires the next insns
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# to occupy exactly 4 bytes
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sub d3,d2
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movbu d1,(a0)
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inc a0
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lcc
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mov e3,a0
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ret [d2,d3],8
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memset_end:
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.size memset, memset_end-memset
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