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authorH. Peter Anvin <hpa@zytor.com>2007-09-21 16:52:35 -0700
committerH. Peter Anvin <hpa@zytor.com>2007-09-21 16:52:35 -0700
commit5a16eeb519c87fa4c437e838af81731b8d355052 (patch)
treef59258a720429d5ad8beaf2070f73cab6a187077 /memdump/memset.S
parent31daeb2ddb972dc70b929da1c93288e821c87ed7 (diff)
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memdump: a debugging utility to dump memory over a serial port
A memory-dumping utility which runs in real mode. Thus, it can be used to get memory dumps from a relatively pristine system.
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+#
+# memset.S
+#
+# Minimal 16-bit memset() implementation
+#
+
+ .text
+ .code16gcc
+ .globl memset
+ .type memset, @function
+memset:
+ cld
+ pushw %di
+ movw %ax,%di
+ movb %dl,%al
+ # The third argument is already in %cx
+ rep ; stosb
+ popw %di
+ retl
+
+ .size memset,.-memset