1 /* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2007-2009 H. Peter Anvin - All Rights Reserved 4 * Copyright 2009 Intel Corporation; author: H. Peter Anvin 5 * 6 * Permission is hereby granted, free of charge, to any person 7 * obtaining a copy of this software and associated documentation 8 * files (the "Software"), to deal in the Software without 9 * restriction, including without limitation the rights to use, 10 * copy, modify, merge, publish, distribute, sublicense, and/or 11 * sell copies of the Software, and to permit persons to whom 12 * the Software is furnished to do so, subject to the following 13 * conditions: 14 * 15 * The above copyright notice and this permission notice shall 16 * be included in all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 20 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 22 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 23 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 25 * OTHER DEALINGS IN THE SOFTWARE. 26 * 27 * ----------------------------------------------------------------------- */ 28 29 /* 30 * shuffle_pm.c 31 * 32 * Shuffle and boot to protected mode code 33 */ 34 35 #include <inttypes.h> 36 #include <syslinux/movebits.h> 37 #include <syslinux/bootpm.h> 38 39 int syslinux_shuffle_boot_pm(struct syslinux_movelist *fraglist, 40 struct syslinux_memmap *memmap, 41 uint16_t bootflags, struct syslinux_pm_regs *regs) 42 { 43 uint8_t handoff_code[9 * 5], *p; 44 const uint32_t *rp; 45 int i, rv; 46 struct syslinux_memmap *tmap; 47 addr_t regstub, stublen; 48 49 tmap = syslinux_target_memmap(fraglist, memmap); 50 if (!tmap) 51 return -1; 52 53 regstub = 0x800; /* Locate anywhere above this point */ 54 stublen = sizeof handoff_code; 55 rv = syslinux_memmap_find_type(tmap, SMT_FREE, ®stub, &stublen, 1); 56 syslinux_free_memmap(tmap); 57 if (rv) 58 return -1; 59 60 /* Build register-setting stub */ 61 p = handoff_code; 62 rp = (const uint32_t *)regs; 63 for (i = 0; i < 8; i++) { 64 *p = 0xb8 + i; /* MOV gpr,imm32 */ 65 *(uint32_t *) (p + 1) = *rp++; 66 p += 5; 67 } 68 *p = 0xe9; /* JMP */ 69 *(uint32_t *) (p + 1) = regs->eip - regstub - sizeof handoff_code; 70 71 /* Add register-setting stub to shuffle list */ 72 if (syslinux_add_movelist(&fraglist, regstub, (addr_t) handoff_code, 73 sizeof handoff_code)) 74 return -1; 75 76 return syslinux_do_shuffle(fraglist, memmap, regstub, 1, bootflags); 77 } 78
