From b28fd807eb6e6ec74964715e0bfd3c32b0dbb449 Mon Sep 17 00:00:00 2001 From: Vladimir 'phcoder' Serbinenko Date: Sun, 26 Dec 2010 00:38:20 +0100 Subject: [PATCH 1/2] freedos support --- docs/grub.texi | 4 + grub-core/Makefile.core.def | 6 ++ grub-core/lib/i386/relocator.c | 2 + grub-core/lib/i386/relocator16.S | 7 +- grub-core/loader/i386/pc/freedos.c | 136 +++++++++++++++++++++++++++++ include/grub/i386/relocator.h | 1 + 6 files changed, 155 insertions(+), 1 deletion(-) create mode 100644 grub-core/loader/i386/pc/freedos.c diff --git a/docs/grub.texi b/docs/grub.texi index 54a2d8791..d9500fb52 100644 --- a/docs/grub.texi +++ b/docs/grub.texi @@ -3305,6 +3305,7 @@ X86 support is summarised in the following table. ``Yes'' means that the kernel @item @tab BIOS @tab Coreboot @item BIOS chainloading @tab yes @tab no (1) @item NTLDR @tab yes @tab no (1) +@item Freedos @tab yes @tab no (1) @item FreeBSD bootloader @tab yes @tab crashes (1) @item 32-bit kFreeBSD @tab yes @tab crashes (2,6) @item 64-bit kFreeBSD @tab yes @tab crashes (2,6) @@ -3329,6 +3330,7 @@ X86 support is summarised in the following table. ``Yes'' means that the kernel @item @tab Multiboot @tab Qemu @item BIOS chainloading @tab no (1) @tab no (1) @item NTLDR @tab no (1) @tab no (1) +@item FreeDOS @tab no (1) @tab no (1) @item FreeBSD bootloader @tab crashes (1) @tab crashes (1) @item 32-bit kFreeBSD @tab crashes (6) @tab crashes (6) @item 64-bit kFreeBSD @tab crashes (6) @tab crashes (6) @@ -3353,6 +3355,7 @@ X86 support is summarised in the following table. ``Yes'' means that the kernel @item @tab 32-bit EFI @tab 64-bit EFI @item BIOS chainloading @tab no (1) @tab no (1) @item NTLDR @tab no (1) @tab no (1) +@item FreeDOS @tab no (1) @tab no (1) @item FreeBSD bootloader @tab crashes (1) @tab crashes (1) @item 32-bit kFreeBSD @tab headless @tab headless @item 64-bit kFreeBSD @tab headless @tab headless @@ -3377,6 +3380,7 @@ X86 support is summarised in the following table. ``Yes'' means that the kernel @item @tab IEEE1275 @item BIOS chainloading @tab no (1) @item NTLDR @tab no (1) +@item FreeDOS @tab no (1) @item FreeBSD bootloader @tab crashes (1) @item 32-bit kFreeBSD @tab crashes (6) @item 64-bit kFreeBSD @tab crashes (6) diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def index 37c0ce970..da309d6d9 100644 --- a/grub-core/Makefile.core.def +++ b/grub-core/Makefile.core.def @@ -1158,6 +1158,12 @@ module = { enable = i386_pc; }; +module = { + name = freedos; + i386_pc = loader/i386/pc/freedos.c; + enable = i386_pc; +}; + module = { name = multiboot2; cppflags = "-DGRUB_USE_MULTIBOOT2"; diff --git a/grub-core/lib/i386/relocator.c b/grub-core/lib/i386/relocator.c index 1bc4240c3..2f10feb5e 100644 --- a/grub-core/lib/i386/relocator.c +++ b/grub-core/lib/i386/relocator.c @@ -50,6 +50,7 @@ extern grub_uint16_t grub_relocator16_gs; extern grub_uint16_t grub_relocator16_ss; extern grub_uint16_t grub_relocator16_sp; extern grub_uint32_t grub_relocator16_edx; +extern grub_uint32_t grub_relocator16_ebx; extern grub_uint8_t grub_relocator32_start; extern grub_uint8_t grub_relocator32_end; @@ -212,6 +213,7 @@ grub_relocator16_boot (struct grub_relocator *rel, grub_relocator16_ss = state.ss; grub_relocator16_sp = state.sp; + grub_relocator16_ebx = state.ebx; grub_relocator16_edx = state.edx; grub_memmove (get_virtual_current_address (ch), &grub_relocator16_start, diff --git a/grub-core/lib/i386/relocator16.S b/grub-core/lib/i386/relocator16.S index c3768f4eb..c6d38eba4 100644 --- a/grub-core/lib/i386/relocator16.S +++ b/grub-core/lib/i386/relocator16.S @@ -136,7 +136,12 @@ VARIABLE(grub_relocator16_sp) .byte 0x66, 0xba VARIABLE(grub_relocator16_edx) .long 0 - + + /* movw imm32, %ebx. */ + .byte 0x66, 0xbb +VARIABLE(grub_relocator16_ebx) + .long 0 + /* Cleared direction flag is of no problem with any current payload and makes this implementation easier. */ cld diff --git a/grub-core/loader/i386/pc/freedos.c b/grub-core/loader/i386/pc/freedos.c new file mode 100644 index 000000000..67d97e246 --- /dev/null +++ b/grub-core/loader/i386/pc/freedos.c @@ -0,0 +1,136 @@ +/* chainloader.c - boot another boot loader */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2004,2007,2009,2010 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static grub_dl_t my_mod; +static struct grub_relocator *rel; +static grub_uint32_t ebx = 0xffffffff; + +#define GRUB_FREEDOS_SEGMENT 0x60 +#define GRUB_FREEDOS_STACK_SEGMENT 0x1fe0 +#define GRUB_FREEDOS_STACK_POINTER 0x8000 + +static grub_err_t +grub_freedos_boot (void) +{ + struct grub_relocator16_state state = { + .cs = GRUB_FREEDOS_SEGMENT, + .ip = 0, + .ds = 0, + .es = 0, + .fs = 0, + .gs = 0, + .ss = GRUB_FREEDOS_STACK_SEGMENT, + .sp = GRUB_FREEDOS_STACK_POINTER, + .ebx = ebx, + .edx = 0 + }; + grub_video_set_mode ("text", 0, 0); + + return grub_relocator16_boot (rel, state); +} + +static grub_err_t +grub_freedos_unload (void) +{ + grub_relocator_unload (rel); + rel = NULL; + grub_dl_unref (my_mod); + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_cmd_freedos (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_file_t file = 0; + grub_err_t err; + void *kernelsys; + grub_size_t kernelsyssize; + + if (argc == 0) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified"); + + grub_dl_ref (my_mod); + + rel = grub_relocator_new (); + if (!rel) + goto fail; + + file = grub_file_open (argv[0]); + if (! file) + goto fail; + + ebx = grub_get_root_biosnumber (); + + kernelsyssize = grub_file_size (file); + { + grub_relocator_chunk_t ch; + err = grub_relocator_alloc_chunk_addr (rel, &ch, GRUB_NTLDR_SEGMENT << 4, + kernelsyssize); + if (err) + goto fail; + kernelsys = get_virtual_current_address (ch); + } + + if (grub_file_read (file, kernelsys, kernelsyssize) + != (grub_ssize_t) ntldrsize) + goto fail; + + grub_loader_set (grub_freedos_boot, grub_freedos_unload, 1); + return GRUB_ERR_NONE; + + fail: + + if (file) + grub_file_close (file); + + grub_ntldr_unload (); + + return grub_errno; +} + +static grub_command_t cmd; + +GRUB_MOD_INIT(freedos) +{ + cmd = grub_register_command ("freedos", grub_cmd_freedos, + 0, N_("Load FreeDOS kernel.sys.")); + my_mod = mod; +} + +GRUB_MOD_FINI(freedos) +{ + grub_unregister_command (cmd); +} diff --git a/include/grub/i386/relocator.h b/include/grub/i386/relocator.h index 6ff5c6631..778049eef 100644 --- a/include/grub/i386/relocator.h +++ b/include/grub/i386/relocator.h @@ -46,6 +46,7 @@ struct grub_relocator16_state grub_uint16_t ss; grub_uint16_t sp; grub_uint16_t ip; + grub_uint32_t ebx; grub_uint32_t edx; }; From af36812f5cf8d15cdb00a80681a2918bd07a9765 Mon Sep 17 00:00:00 2001 From: Vladimir 'phcoder' Serbinenko Date: Sun, 26 Dec 2010 00:57:03 +0100 Subject: [PATCH 2/2] fix a compilation error --- grub-core/loader/i386/pc/freedos.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/grub-core/loader/i386/pc/freedos.c b/grub-core/loader/i386/pc/freedos.c index 67d97e246..0ae815490 100644 --- a/grub-core/loader/i386/pc/freedos.c +++ b/grub-core/loader/i386/pc/freedos.c @@ -97,7 +97,7 @@ grub_cmd_freedos (grub_command_t cmd __attribute__ ((unused)), kernelsyssize = grub_file_size (file); { grub_relocator_chunk_t ch; - err = grub_relocator_alloc_chunk_addr (rel, &ch, GRUB_NTLDR_SEGMENT << 4, + err = grub_relocator_alloc_chunk_addr (rel, &ch, GRUB_FREEDOS_SEGMENT << 4, kernelsyssize); if (err) goto fail; @@ -105,7 +105,7 @@ grub_cmd_freedos (grub_command_t cmd __attribute__ ((unused)), } if (grub_file_read (file, kernelsys, kernelsyssize) - != (grub_ssize_t) ntldrsize) + != (grub_ssize_t) kernelsyssize) goto fail; grub_loader_set (grub_freedos_boot, grub_freedos_unload, 1); @@ -116,7 +116,7 @@ grub_cmd_freedos (grub_command_t cmd __attribute__ ((unused)), if (file) grub_file_close (file); - grub_ntldr_unload (); + grub_freedos_unload (); return grub_errno; }