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authorGreg Hartman <ghartman@google.com>2016-11-23 15:51:27 -0800
committerGreg Hartman <ghartman@google.com>2016-11-23 15:52:24 -0800
commit76d05dc695b06c4e987bb8078f78032441e1430c (patch)
tree7b567ae0c1fde3fd699b8839ca39b54aa1c10046 /core/bcopy32.inc
parent49db3fec5f3681cf8fafd57c8987fcff2d40bc89 (diff)
downloadsyslinux-security-oc-release.tar.gz
Clean checkin of the 6.03 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BUG: 32495852 Change-Id: I5038a3bb41e217380c1188463daec07b1e9b6b48
Diffstat (limited to 'core/bcopy32.inc')
-rw-r--r--core/bcopy32.inc77
1 files changed, 77 insertions, 0 deletions
diff --git a/core/bcopy32.inc b/core/bcopy32.inc
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--- /dev/null
+++ b/core/bcopy32.inc
@@ -0,0 +1,77 @@
+;; -----------------------------------------------------------------------
+;;
+;; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved
+;; Copyright 2009 Intel Corporation; author: H. Peter Anvin
+;;
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+;; Boston MA 02111-1307, USA; either version 2 of the License, or
+;; (at your option) any later version; incorporated herein by reference.
+;;
+;; -----------------------------------------------------------------------
+
+;;
+;; bcopy32.inc
+;;
+;; 32-bit bcopy routine for real mode
+;;
+
+;
+; 32-bit bcopy routine for real mode
+;
+; We enter protected mode, set up a flat 32-bit environment, run rep movsd
+; and then exit. IMPORTANT: This code assumes cs == 0.
+;
+; This code is probably excessively anal-retentive in its handling of
+; segments, but this stuff is painful enough as it is without having to rely
+; on everything happening "as it ought to."
+;
+
+ bits 16
+ section .text16
+
+;
+; bcopy:
+; 32-bit copy, overlap safe
+;
+; Inputs:
+; ESI - source pointer (-1 means do bzero rather than bcopy)
+; EDI - target pointer
+; ECX - byte count
+;
+; Outputs:
+; ESI - first byte after source (garbage if ESI == -1 on entry)
+; EDI - first byte after target
+;
+bcopy: jecxz .ret
+ pm_call pm_bcopy
+ add edi,ecx
+ add esi,ecx
+.ret: ret
+
+;
+; shuffle_and_boot_raw:
+; The new version of shuffle and boot.
+; Inputs:
+; ESI -> Pointer to list of (dst, src, len) pairs(*)
+; EDI -> Pointer to safe area for list + shuffler
+; (must not overlap this code nor the RM stack)
+; ECX -> Byte count of list area (for initial copy)
+;
+; If src == -1: then the memory pointed to by (dst, len) is bzeroed;
+; this is handled inside the bcopy routine.
+;
+; If len == 0: this marks the end of the list; dst indicates
+; the entry point and src the mode (0 = pm, 1 = rm)
+;
+; (*) dst, src, and len are four bytes each
+;
+shuffle_and_boot_raw:
+ mov bx,pm_shuffle
+ jmp enter_pm
+
+;
+; The 32-bit copy and shuffle code is "special", so it is in its own file
+;
+%include "bcopyxx.inc"