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