From Lucho:
SYS 3.0 changes: added /L parameter to SYS to be able to change the kernel boot segment + a few boot sector changes to get the pointer at the same magic place for all boot sectors. git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@751 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman
parent
3819d769a7
commit
677bac3481
@ -139,10 +139,8 @@ Entry: jmp short real_start
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times 0x3E-$+$$ db 0
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%define loadsegoff_60 bp+0x3E
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dw 0
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%define loadseg_60 bp+0x40
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dw LOADSEG
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%define loadsegoff_60 bp+loadseg_off-Entry
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%define loadseg_60 bp+loadseg_seg-Entry
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;%define LBA_PACKET bp+0x42
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; db 10h ; size of packet
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@ -199,6 +197,9 @@ real_start:
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rep movsw
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jmp word 0x1FE0:cont
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loadseg_off dw 0
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loadseg_seg dw LOADSEG
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cont:
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mov ds, ax
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mov ss, ax
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@ -65,10 +65,8 @@ Entry: jmp short real_start
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%define fat_sector bp+0x48 ; last accessed sector of the FAT
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%define loadsegoff_60 bp+0x5a ; FAR pointer = 60:0
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dw 0
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%define loadseg_60 bp+0x5c
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dw LOADSEG
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%define loadsegoff_60 bp+loadseg_off-Entry ; FAR pointer = 60:0
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%define loadseg_60 bp+loadseg_seg-Entry
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%define fat_start bp+0x5e ; first FAT sector
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%define data_start bp+0x62 ; first data sector
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@ -93,6 +91,9 @@ real_start: cld
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rep movsw ; move boot code to the 0x1FE0:0x0000
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jmp word 0x1FE0:cont
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loadseg_off dw 0
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loadseg_seg dw LOADSEG
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cont: mov ds, ax
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mov ss, ax
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lea sp, [bp-0x20]
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@ -81,6 +81,7 @@ Entry: jmp short real_start
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; +0x32 dw -1 or sector number of boot sector backup
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; (+0x34 .. +0x3f reserved)
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%define drive bp+0x40 ; Drive number
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%define loadsegoff_60 bp+loadseg_off-Entry
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%define LOADSEG 0x0060
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@ -107,24 +108,27 @@ Entry: jmp short real_start
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;-----------------------------------------------------------------------
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real_start: cld
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cli
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sub ax, ax
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mov ds, ax
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lss sp, [mystack] ; initialize stack
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int 0x13 ; reset drive
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mov bp, 0x7c00
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mov ax, 0x1FE0
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mov es, ax
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mov si, sp
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mov di, sp
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mov bp, sp ; bp-relative parameter addresses used
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mov si, bp
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mov di, bp
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mov cx, 0x0100
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rep movsw ; move boot code to the 0x1FE0:0x0000
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jmp word 0x1FE0:cont
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loadseg_off dw 0, LOADSEG
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; -------------
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cont: mov ds, ax
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mov ss, ax ; stack and BP-relative moves up, too
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lea sp, [bp-0x20]
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sti
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mov [drive], dl ; BIOS passes drive number in DL
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mov si, msg_LoadFreeDOS
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@ -177,9 +181,7 @@ ff_next_clust: push eax ; save cluster
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jc boot_error ; EOC encountered
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; EDX is clust/sector, EAX is sector
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ff_next_sector: mov bx, LOADSEG
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mov es, bx
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sub bx, bx ; load to loadseg:0
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ff_next_sector: les bx, [loadsegoff_60] ; load to loadseg:0
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call readDisk
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;--- push eax ; save sector
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@ -233,7 +235,7 @@ rk_walk_fat: pop eax
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;-----------------------------------------------------------------------
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boot_success: mov bl, [drive]
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jmp word LOADSEG:0
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jmp far [loadsegoff_60]
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;-----------------------------------------------------------------------
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@ -389,9 +391,6 @@ no_incr_es: pop di
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msg_LoadFreeDOS db "Loading FreeDOS ",0
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mystack dw 0x7c00 ; the 0 for SS overlaps into pad bytes!
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; (so we can LSS SP to 0:7c00)
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times 0x01ee-$+$$ db 0
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msg_BootError db "No "
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25
sys/sys.c
25
sys/sys.c
@ -29,7 +29,7 @@
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#define DEBUG
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/* #define DDEBUG */
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#define SYS_VERSION "v2.9"
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#define SYS_VERSION "v3.0"
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#include <stdlib.h>
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#include <dos.h>
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@ -159,7 +159,7 @@ char *getenv(const char *name)
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BYTE pgm[] = "SYS";
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void put_boot(int, char *, char *, int);
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void put_boot(int, char *, char *, int, int);
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BOOL check_space(COUNT, ULONG);
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BOOL copy(COUNT drive, BYTE * srcPath, BYTE * rootPath, BYTE * file);
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@ -254,6 +254,7 @@ int main(int argc, char **argv)
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int bootonly = 0;
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int both = 0;
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char *kernel_name = "KERNEL.SYS";
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int load_segment = 0x60;
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printf("FreeDOS System Installer " SYS_VERSION ", " __DATE__ "\n\n");
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@ -278,6 +279,11 @@ int main(int argc, char **argv)
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argno++;
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kernel_name = argv[argno];
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}
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else if (argp[0] == '/' && toupper(argp[1]) == 'L' && argno + 1 < argc)
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{
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argno++;
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load_segment = (int)strtol(argv[argno], NULL, 16);
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}
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else if (memicmp(argp, "BOOTONLY", 8) == 0 && !bootonly)
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{
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bootonly = 1;
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@ -303,7 +309,7 @@ int main(int argc, char **argv)
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if (drivearg == 0)
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{
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printf(
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"Usage: %s [source] drive: [bootsect [BOTH]] [BOOTONLY] [/K name]\n"
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"Usage: %s [source] drive: [bootsect [BOTH]] [BOOTONLY] [/K name] [/L segm]\n"
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" source = A:,B:,C:\\KERNEL\\BIN\\,etc., or current directory if not given\n"
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" drive = A,B,etc.\n"
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" bootsect = name of 512-byte boot sector file image for drive:\n"
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@ -311,6 +317,7 @@ int main(int argc, char **argv)
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" BOTH : write to *both* the real boot sector and the image file\n"
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" BOOTONLY : do *not* copy kernel / shell, only update boot sector or image\n"
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" /K name : name of kernel to use instead of KERNEL.SYS\n"
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" /L segm : hex load segment to use instead of 60\n"
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"%s CONFIG /help\n", pgm, pgm);
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exit(1);
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}
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@ -362,7 +369,7 @@ int main(int argc, char **argv)
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sprintf(rootPath, "%c:\\", 'A' + srcDrive);
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printf("Processing boot sector...\n");
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put_boot(drive, bsFile, kernel_name, both);
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put_boot(drive, bsFile, kernel_name, load_segment, both);
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if (!bootonly)
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{
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@ -662,7 +669,7 @@ BOOL haveLBA(void)
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}
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#endif
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void put_boot(int drive, char *bsFile, char *kernel_name, int both)
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void put_boot(int drive, char *bsFile, char *kernel_name, int load_seg, int both)
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{
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#ifdef WITHFAT32
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struct bootsectortype32 *bs32;
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@ -756,6 +763,12 @@ void put_boot(int drive, char *bsFile, char *kernel_name, int both)
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bs32 = (struct bootsectortype32 *)&newboot;
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/* put 0 for A: or B: (force booting from A:), otherwise use DL */
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bs32->bsDriveNumber = drive < 2 ? 0 : 0xff;
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/* the location of the "0060" segment portion of the far pointer
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in the boot sector is just before cont: in boot*.asm.
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This happens to be offset 0x78 (=0x3c * 2) for FAT32 and
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offset 0x5c (=0x2e * 2) for FAT16 */
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/* i.e. BE CAREFUL WHEN YOU CHANGE THE BOOT SECTORS !!! */
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((int *)newboot)[0x3C] = load_seg;
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#ifdef DEBUG
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printf(" FAT starts at sector %lx + %x\n",
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bs32->bsHiddenSecs, bs32->bsResSectors);
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@ -766,6 +779,7 @@ void put_boot(int drive, char *bsFile, char *kernel_name, int both)
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{
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/* put 0 for A: or B: (force booting from A:), otherwise use DL */
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bs->bsDriveNumber = drive < 2 ? 0 : 0xff;
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((int *)newboot)[0x2E] = load_seg;
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}
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#ifdef DEBUG /* add an option to display this on user request? */
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@ -801,6 +815,7 @@ void put_boot(int drive, char *bsFile, char *kernel_name, int both)
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#ifdef DEBUG
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/* there's a zero past the kernel name in all boot sectors */
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printf("Boot sector kernel name set to %s\n", &newboot[0x1f1]);
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printf("Boot sector load segment set to %Xh\n", load_seg);
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#endif
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#ifdef DDEBUG
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