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author | luigi <luigi@FreeBSD.org> | 2008-12-30 09:40:50 +0000 |
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committer | luigi <luigi@FreeBSD.org> | 2008-12-30 09:40:50 +0000 |
commit | 9b90a7e39ef854e7eab5756d2072da1010aee5d7 (patch) | |
tree | 1d3b9f03b4fa55a1a88a45dc77a421e68b6a22eb /sys | |
parent | 4dc7d8d63bb23b504db5b2fed51db445b5b94532 (diff) | |
download | FreeBSD-src-9b90a7e39ef854e7eab5756d2072da1010aee5d7.zip FreeBSD-src-9b90a7e39ef854e7eab5756d2072da1010aee5d7.tar.gz |
A number of small changes to make the 'save choice to disk' safer,
and re-enable it as default.
In particular:
+ re-enable the 'update' flag in the Makefile (of course!);
+ commit Warner's patch "orb $NOUPDATE,_FLAGS(%bp)"
to avoid writing to disk in case of a timeout/default choice;
+ fix an off-by-one count in the partition scan code that would
print the wrong name for unknown partitions;
+ unconditionally change the boot prompt to 'Boot:' instead of 'Default:'
to make room for the extra code/checks/messages. Some of the changes
listed below are also made to save space;
+ rearrange and fix comments for known partition types. Right now we
explicitly recognise *BSD, Linux, FAT16 (type 6, used on many USB keys),
NTFS (type 7), FAT32 (type 11).
Depending on other options we also recognise Extended (type 5),
FAT12 (type 1) and FAT16 < 32MB (type 4).
+ Add an entry "F6 PXE" when the code is built with -DPXE (which is
a default now). Technically, F6 boots through INT18, so the prompt 'PXE'
is a bit misleading. Unfortunately the name INT18
is too long and does not fit in - we could use ROM perhaps.
The reason I picked 'PXE' is that on many (I believe) new systems
INT18 calls PXE.
Apart from the choice of the name for PXE/ROM/INT18, this should close
pending issues on the 1-sector boot0 code and we should be able to
move the code to RELENG_7 when it reopens.
No boot0cfg changes are necessary.
MFC after: 3 weeks
Diffstat (limited to 'sys')
-rw-r--r-- | sys/boot/i386/boot0/Makefile | 2 | ||||
-rw-r--r-- | sys/boot/i386/boot0/boot0.S | 53 |
2 files changed, 27 insertions, 28 deletions
diff --git a/sys/boot/i386/boot0/Makefile b/sys/boot/i386/boot0/Makefile index 27f66d5..3b3bb52 100644 --- a/sys/boot/i386/boot0/Makefile +++ b/sys/boot/i386/boot0/Makefile @@ -30,7 +30,7 @@ CFLAGS += ${OPTS} # with the one in the boot sector. # Default boot flags: -BOOT_BOOT0_FLAGS?= 0xcf +BOOT_BOOT0_FLAGS?= 0x8f # The number of timer ticks to wait for a keypress before assuming the default # selection. Since there are 18.2 ticks per second, the default value of diff --git a/sys/boot/i386/boot0/boot0.S b/sys/boot/i386/boot0/boot0.S index 3baf0e6..2950124 100644 --- a/sys/boot/i386/boot0/boot0.S +++ b/sys/boot/i386/boot0/boot0.S @@ -22,6 +22,7 @@ #endif #ifdef PXE /* enable PXE/INT18 booting with F6 */ +#define SAVE_MORE_MEMORY #endif #ifdef CHECK_DRIVE /* make sure we boot from a HD. */ @@ -274,10 +275,11 @@ read_entry: movb %ch,-0x4(%bx) # Zero active flag (ch == 0) * Scan the table of bootable ids, which starts at %di and has * length TLEN. On a match, %di points to the element following the * match; the corresponding offset to the description is $(TLEN-1) - * bytes ahead. If we don't find a match, we hit the 'unknown' entry. + * bytes ahead. We use a count of TLEN+1 so if we don't find a match + * within the first TLEN entries, we hit the 'unknown' entry. */ movw $bootable_ids,%di # Lookup tables - movb $(TLEN),%cl # Number of entries + movb $(TLEN+1),%cl # Number of entries repne # Locate scasb # type /* @@ -324,7 +326,7 @@ print_drive: addb $'0'|0x80,%al # Save next callw putx # item /* * Menu is complete, display a prompt followed by current selection. - * 'decw %si' makes the register point to the space after 'Default: ' + * 'decw %si' makes the register point to the space after 'Boot: ' * so we do not see an extra CRLF on the screen. */ print_prompt: movw $prompt,%si # Display @@ -371,6 +373,7 @@ read_key: * Timed out or default selection */ use_default: movb _OPT(%bp),%al # Load default + orb $NOUPDATE,_FLAGS(%bp) # Disable updates jmp check_selection # Join common code /* @@ -585,13 +588,12 @@ intx13: # Prepare CHS parameters * Various menu strings. 'item' goes after 'prompt' to save space. * Also use shorter versions to make room for the PXE/INT18 code. */ +prompt: #ifdef PXE -prompt: .ascii "\nBoot:" -item: .ascii " "; .byte ' '|0x80 -#else -prompt: .ascii "\nDefault:" -item: .ascii " "; .byte ' '|0x80 + .ascii "\nF6 PXE\r" #endif + .ascii "\nBoot:" +item: .ascii " "; .byte ' '|0x80 crlf: .ascii "\r"; .byte '\n'|0x80 /* Partition type tables */ @@ -602,13 +604,13 @@ bootable_ids: * Corresponding descriptions are at desc_ofs: * Entries don't need to be sorted. */ - .byte 0x1, 0x6, 0x7, 0xb, 0xc -#ifndef SAVE_MEMORY - .byte 0xe -#endif - .byte 0x83, 0xa5, 0xa6, 0xa9, 0x4 + .byte 0x83, 0xa5, 0xa6, 0xa9, 0x06, 0x07, 0x0b #ifndef SAVE_MORE_MEMORY - .byte 0x5, 0xf + .byte 0x05 # extended partition +#endif +#ifndef SAVE_MEMORY /* other DOS partitions */ + .byte 0x01 # FAT12 + .byte 0x04 # FAT16 < 32M #endif desc_ofs: @@ -617,24 +619,21 @@ desc_ofs: * actual partition name. The last entry must point to os_misc, * which is used for non-matching names. */ - .byte os_dos-. # 1, FAT12 DOS - .byte os_dos-. # 6, FAT16 <32M, DOS/WIN - .byte os_win-. # 7, FAT16 >=32M Windows - .byte os_win-. # 11, FAT32 - .byte os_win-. # 12, FAT32-LBA -#ifndef SAVE_MEMORY - .byte os_win-. # 14, FAT16-LBA -#endif .byte os_linux-. # 131, Linux .byte os_freebsd-. # 165, FreeBSD .byte os_bsd-. # 166, OpenBSD .byte os_bsd-. # 169, NetBSD - .byte os_dos-. # 4, FAT16 < 32M + .byte os_dos-. # 6, FAT16 >= 32M + .byte os_win-. # 7, NTFS + .byte os_win-. # 11, FAT32 + #ifndef SAVE_MORE_MEMORY .byte os_ext-. # 5, DOS Ext - .byte os_ext-. # 15, DOS Ext-LBA #endif - +#ifndef SAVE_MEMORY + .byte os_dos-. # 1, FAT12 DOS + .byte os_dos-. # 4, FAT16 <32M +#endif .byte os_misc-. # Unknown /* @@ -643,10 +642,10 @@ desc_ofs: */ os_misc: .byte '?'|0x80 os_dos: -#ifndef SAVE_MEMORY /* DOS string only if room */ +#ifndef SAVE_MORE_MEMORY /* 'DOS' remapped to 'WIN' if no room */ .ascii "DO"; .byte 'S'|0x80 #endif -os_win: .ascii "WI"; .byte 'N'|0x80 +os_win: .ascii "Wi"; .byte 'n'|0x80 os_linux: .ascii "Linu"; .byte 'x'|0x80 os_freebsd: .ascii "Free" os_bsd: .ascii "BS"; .byte 'D'|0x80 |