diff options
author | H. Peter Anvin <hpa@zytor.com> | 2007-10-11 16:03:30 -0700 |
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committer | H. Peter Anvin <hpa@zytor.com> | 2007-12-13 13:55:54 -0800 |
commit | 8d8ec4ae593354aacb796308b4e6c4d6bd466242 (patch) | |
tree | 99a81b0d6bc305a2035ff75b87dabf3551513e8c /com32/lib/syslinux | |
parent | 47b318940041cb713958d469a88b1859e14808b0 (diff) | |
download | syslinux-8d8ec4ae593354aacb796308b4e6c4d6bd466242.tar.gz |
Initial support for auxilliary data vector
Initial support for the auxillary data vector, a storage mechanism
intended to support boot-once and similar features.
Diffstat (limited to 'com32/lib/syslinux')
-rw-r--r-- | com32/lib/syslinux/adv.c | 49 | ||||
-rw-r--r-- | com32/lib/syslinux/advwrite.c | 45 |
2 files changed, 94 insertions, 0 deletions
diff --git a/com32/lib/syslinux/adv.c b/com32/lib/syslinux/adv.c new file mode 100644 index 00000000..75aab2cf --- /dev/null +++ b/com32/lib/syslinux/adv.c @@ -0,0 +1,49 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 2007 H. Peter Anvin - All Rights Reserved + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom + * the Software is furnished to do so, subject to the following + * conditions: + * + * The above copyright notice and this permission notice shall + * be included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * ----------------------------------------------------------------------- */ + +/* + * syslinux/adv.h + * + * Access the syslinux auxilliary data vector + */ + +#include <syslinux/adv.h> +#include <klibc/compiler.h> +#include <com32.h> + +void *__syslinux_adv_ptr; +size_t __syslinux_adv_size; + +void __constructor __syslinux_get_adv(void) +{ + static com32sys_t reg; + + reg.eax.w[0] = 0x001c; + __intcall(0x22, ®, ®); + __syslinux_adv_ptr = MK_PTR(reg.es, reg.ebx.w[0]); + __syslinux_adv_size = reg.ecx.w[0]; +} diff --git a/com32/lib/syslinux/advwrite.c b/com32/lib/syslinux/advwrite.c new file mode 100644 index 00000000..1fe26b4e --- /dev/null +++ b/com32/lib/syslinux/advwrite.c @@ -0,0 +1,45 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 2007 H. Peter Anvin - All Rights Reserved + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom + * the Software is furnished to do so, subject to the following + * conditions: + * + * The above copyright notice and this permission notice shall + * be included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * ----------------------------------------------------------------------- */ + +/* + * syslinux/advwrite.c + * + * Write back the ADV + */ + +#include <syslinux/adv.h> +#include <klibc/compiler.h> +#include <com32.h> + +int syslinux_adv_write(void) +{ + static com32sys_t reg; + + reg.eax.w[0] = 0x001d; + __intcall(0x22, ®, ®); + return (reg.eflags.l & EFLAGS_CF) ? -1 : 0; +} |