78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2007-2009 H. Peter Anvin - All Rights Reserved
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* Copyright 2009 Intel Corporation; author: H. Peter Anvin
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* shuffle_pm.c
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*
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* Shuffle and boot to protected mode code
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*/
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#include <inttypes.h>
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#include <syslinux/movebits.h>
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#include <syslinux/bootpm.h>
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int syslinux_shuffle_boot_pm(struct syslinux_movelist *fraglist,
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struct syslinux_memmap *memmap,
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uint16_t bootflags, struct syslinux_pm_regs *regs)
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{
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uint8_t handoff_code[9 * 5], *p;
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const uint32_t *rp;
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int i, rv;
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struct syslinux_memmap *tmap;
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addr_t regstub, stublen;
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tmap = syslinux_target_memmap(fraglist, memmap);
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if (!tmap)
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return -1;
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regstub = 0x800; /* Locate anywhere above this point */
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stublen = sizeof handoff_code;
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rv = syslinux_memmap_find_type(tmap, SMT_FREE, ®stub, &stublen, 1);
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syslinux_free_memmap(tmap);
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if (rv)
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return -1;
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/* Build register-setting stub */
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p = handoff_code;
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rp = (const uint32_t *)regs;
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for (i = 0; i < 8; i++) {
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*p = 0xb8 + i; /* MOV gpr,imm32 */
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*(uint32_t *) (p + 1) = *rp++;
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p += 5;
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}
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*p = 0xe9; /* JMP */
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*(uint32_t *) (p + 1) = regs->eip - regstub - sizeof handoff_code;
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/* Add register-setting stub to shuffle list */
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if (syslinux_add_movelist(&fraglist, regstub, (addr_t) handoff_code,
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sizeof handoff_code))
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return -1;
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return syslinux_do_shuffle(fraglist, memmap, regstub, 1, bootflags);
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}
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