diff options
Diffstat (limited to 'contrib/syslinux/syslinux-4.03/com32/lib/syslinux/shuffle_rm.c')
| -rw-r--r-- | contrib/syslinux/syslinux-4.03/com32/lib/syslinux/shuffle_rm.c | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/contrib/syslinux/syslinux-4.03/com32/lib/syslinux/shuffle_rm.c b/contrib/syslinux/syslinux-4.03/com32/lib/syslinux/shuffle_rm.c deleted file mode 100644 index a7d16d6..0000000 --- a/contrib/syslinux/syslinux-4.03/com32/lib/syslinux/shuffle_rm.c +++ /dev/null @@ -1,171 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 2007-2009 H. Peter Anvin - All Rights Reserved - * Copyright 2009 Intel Corporation; author: H. Peter Anvin - * - * 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. - * - * ----------------------------------------------------------------------- */ - -/* - * shuffle_rm.c - * - * Shuffle and boot to protected mode code - */ - -#include <stdlib.h> -#include <inttypes.h> -#include <com32.h> -#include <string.h> -#include <syslinux/movebits.h> -#include <syslinux/bootrm.h> - -enum gpr_index { R_AX, R_CX, R_DX, R_BX, R_SP, R_BP, R_SI, R_DI }; -enum seg_index { R_ES, R_CS, R_SS, R_DS, R_FS, R_GS }; - -#define ST8(P,V) \ - do { \ - uint8_t *_p = (void *)(P); \ - *_p++ = (V); \ - (P) = (void *)_p; \ - } while (0); -#define ST16(P,V) \ - do { \ - uint16_t *_p = (void *)(P); \ - *_p++ = (V); \ - (P) = (void *)_p; \ - } while (0) -#define ST32(P,V) \ - do { \ - uint32_t *_p = (void *)(P); \ - *_p++ = (V); \ - (P) = (void *)_p; \ - } while (0) - -#define MOV_TO_SEG(P,S,R) \ - ST16(P, 0xc08e + ((R) << 8) + ((S) << 11)) -#define MOV_TO_R16(P,R,V) \ - do { \ - ST8(P, 0xb8 + (R)); \ - ST16(P, V); \ - } while (0) -#define MOV_TO_R32(P,R,V) \ - do { \ - ST16(P, 0xb866 + ((R) << 8)); \ - ST32(P, V); \ - } while (0) - -int syslinux_shuffle_boot_rm(struct syslinux_movelist *fraglist, - struct syslinux_memmap *memmap, - uint16_t bootflags, struct syslinux_rm_regs *regs) -{ - const struct syslinux_rm_regs_alt { - uint16_t seg[6]; - uint32_t gpr[8]; - uint32_t csip; - bool sti; - } *rp; - int i, rv; - uint8_t handoff_code[8 + 5 * 5 + 8 * 6 + 1 + 5], *p; - uint16_t off; - struct syslinux_memmap *tmap; - addr_t regstub, stublen; - /* Assign GPRs for each sreg, don't use AX and SP */ - static const uint8_t gpr_for_seg[6] = - { R_CX, R_DX, R_BX, R_BP, R_SI, R_DI }; - - tmap = syslinux_target_memmap(fraglist, memmap); - if (!tmap) - return -1; - - /* - * Search for a good place to put the real-mode register stub. - * We prefer it as low as possible above 0x800. KVM barfs horribly - * if we're not aligned to a paragraph boundary, so set the alignment - * appropriately. - */ - regstub = 0x800; - stublen = sizeof handoff_code; - rv = syslinux_memmap_find(tmap, SMT_FREE, ®stub, &stublen, 16); - - if (rv || (regstub > 0x100000 - sizeof handoff_code)) { - /* - * Uh-oh. This isn't real-mode accessible memory. - * It might be possible to do something insane here like - * putting the stub in the IRQ vectors, or in the 0x5xx segment. - * This code tries the 0x510-0x7ff range and hopes for the best. - */ - regstub = 0x510; /* Try the 0x5xx segment... */ - stublen = sizeof handoff_code; - rv = syslinux_memmap_find(tmap, SMT_FREE, ®stub, &stublen, 16); - - if (!rv && (regstub > 0x100000 - sizeof handoff_code)) - rv = -1; /* No acceptable memory found */ - } - - syslinux_free_memmap(tmap); - if (rv) - return -1; - - /* Build register-setting stub */ - p = handoff_code; - rp = (const struct syslinux_rm_regs_alt *)regs; - - /* Set up GPRs with segment registers - don't use AX */ - for (i = 0; i < 6; i++) { - if (i != R_CS) - MOV_TO_R16(p, gpr_for_seg[i], rp->seg[i]); - } - - /* Actual transition to real mode */ - ST32(p, 0xeac0220f); /* MOV CR0,EAX; JMP FAR */ - off = (p - handoff_code) + 4; - ST16(p, off); /* Offset */ - ST16(p, regstub >> 4); /* Segment */ - - /* Load SS and ESP immediately */ - MOV_TO_SEG(p, R_SS, R_BX); - MOV_TO_R32(p, R_SP, rp->gpr[R_SP]); - - /* Load the other segments */ - MOV_TO_SEG(p, R_ES, R_CX); - MOV_TO_SEG(p, R_DS, R_BP); - MOV_TO_SEG(p, R_FS, R_SI); - MOV_TO_SEG(p, R_GS, R_DI); - - for (i = 0; i < 8; i++) { - if (i != R_SP) - MOV_TO_R32(p, i, rp->gpr[i]); - } - - ST8(p, rp->sti ? 0xfb : 0xfa); /* STI/CLI */ - - ST8(p, 0xea); /* JMP FAR */ - ST32(p, rp->csip); - - /* Add register-setting stub to shuffle list */ - if (syslinux_add_movelist(&fraglist, regstub, (addr_t) handoff_code, - sizeof handoff_code)) - return -1; - - return syslinux_do_shuffle(fraglist, memmap, regstub, 0, bootflags); -} |