#include <klibc/extern.h>
#include <stddef.h>
+#include <syslinux/advconst.h>
__extern void *__syslinux_adv_ptr;
__extern size_t __syslinux_adv_size;
__extern int syslinux_adv_write(void);
+__extern int syslinux_setadv(int, size_t, const void *);
+__extern const void *syslinux_getadv(int, size_t *);
+
#endif /* _SYSLINUX_ADV_H */
--- /dev/null
+/* ----------------------------------------------------------------------- *
+ *
+ * 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/advconst.h
+ *
+ * ADV defined constants
+ *
+ * Defined in a separate file so it can be used by non-COM32 code.
+ * Some of these constants are also defined in adv.inc, they better match...
+ */
+
+#ifndef _SYSLINUX_ADVCONST_H
+#define _SYSLINUX_ADVCONST_H
+
+#define ADV_END 0
+#define ADV_BOOTONCE 1
+
+#endif /* _SYSLINUX_ADVCONST_H */
\
syslinux/pxe_get_cached.o \
\
- syslinux/adv.o syslinux/advwrite.o
+ syslinux/adv.o syslinux/advwrite.o syslinux/getadv.o \
+ syslinux/setadv.o
BINDIR = /usr/bin
LIBDIR = /usr/lib
* ----------------------------------------------------------------------- */
/*
- * syslinux/adv.h
+ * syslinux/adv.c
*
* Access the syslinux auxilliary data vector
*/
--- /dev/null
+/* ----------------------------------------------------------------------- *
+ *
+ * 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/getadv.c
+ *
+ * Get a data item from the auxilliary data vector. Returns a pointer
+ * and sets *size on success; NULL on failure.
+ */
+
+#include <syslinux/adv.h>
+#include <klibc/compiler.h>
+#include <inttypes.h>
+
+const void *syslinux_getadv(int tag, size_t *size)
+{
+ const uint8_t *p;
+ size_t left, len;
+
+ p = syslinux_adv_ptr();
+ left = syslinux_adv_size();
+
+ while (left >= 2) {
+ uint8_t ptag = *p++;
+ size_t plen = *p++;
+ left -= 2;
+
+ if (ptag == ADV_END)
+ return NULL; /* Not found */
+
+ if (left < plen)
+ return NULL; /* Item overrun */
+
+ if (ptag == tag) {
+ *size = plen;
+ return p;
+ }
+
+ p += plen;
+ left -= plen;
+ }
+
+ return NULL;
+}
--- /dev/null
+/* ----------------------------------------------------------------------- *
+ *
+ * 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/setadv.c
+ *
+ * (Over)write a data item in the auxilliary data vector. To
+ * delete an item, set its length to zero.
+ *
+ * Return 0 on success, -1 on error, and set errno.
+ *
+ * NOTE: Data is not written to disk unless
+ * syslinux_adv_write() is called.
+ */
+
+#include <syslinux/adv.h>
+#include <klibc/compiler.h>
+#include <inttypes.h>
+#include <string.h>
+#include <errno.h>
+#include <alloca.h>
+
+int syslinux_setadv(int tag, size_t size, const void *data)
+{
+ uint8_t *p, *advtmp;
+ size_t left;
+
+ if ((unsigned)tag-1 > 254) {
+ errno = EINVAL;
+ return -1; /* Impossible tag value */
+ }
+
+ left = syslinux_adv_size();
+ p = advtmp = alloca(left);
+ memcpy(p, syslinux_adv_ptr(), left); /* Make working copy */
+
+ while (left >= 2) {
+ uint8_t ptag = p[0];
+ size_t plen = p[1]+2;
+
+ if (ptag == ADV_END)
+ break;
+
+ if (ptag == tag) {
+ /* Found our tag. Delete it. */
+
+ if (plen >= left) {
+ /* Entire remainder is our tag */
+ break;
+ }
+ memmove(p, p+plen, left-plen);
+ } else {
+ /* Not our tag */
+ if (plen > left)
+ break; /* Corrupt tag (overrun) - overwrite it */
+
+ left -= plen;
+ p += plen;
+ }
+ }
+
+ /* Now (p, left) reflects the position to write in and how much space
+ we have for our data. */
+
+ if (left < size+2) {
+ errno = ENOSPC; /* Not enough space for data */
+ return -1;
+ }
+
+ *p++ = tag;
+ *p++ = size;
+ memcpy(p, data, size);
+ left -= size+2;
+
+ memset(p, 0, left);
+
+ /* If we got here, everything went OK, commit the write to low memory */
+ memcpy(syslinux_adv_ptr(), advtmp, syslinux_adv_size());
+
+ return 0;
+}
+
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