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Add lock/unlock drive to SYS (from Lucho).

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git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@658 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2003-08-28 20:36:16 +00:00
parent b0d2219a4c
commit fa11f8e0c5
1 changed files with 45 additions and 4 deletions
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49
sys/sys.c
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@ -57,6 +57,7 @@
/* These definitions deliberately put here instead of
* #including <stdio.h> to make executable MUCH smaller
* using [s]printf from prf.c!
*/
extern WORD CDECL printf(CONST BYTE * fmt, ...);
extern WORD CDECL sprintf(BYTE * buff, CONST BYTE * fmt, ...);
@ -306,7 +307,7 @@ int main(int argc, char **argv)
if (argc > drivearg + 1 && memicmp(argv[drivearg + 1], "BOOTONLY", 8) != 0)
bsFile = argv[drivearg + 1]; /* don't write to file "BOOTONLY" */
printf("\nWriting boot sector...\n");
printf("Processing boot sector...\n");
put_boot(drive, bsFile,
(argc > drivearg + 2)
&& memicmp(argv[drivearg + 2], "BOTH", 4) == 0);
@ -413,6 +414,23 @@ void reset_drive(int DosDrive);
parm [dx] \
modify [ax bx];
void lock_drive(int DosDrive);
#pragma aux lock_drive = \
"mov ax,0x440d" \
"mov cx,0x84a" \
"xor dx,dx" \
"inc bx" \
"int 0x21" \
parm [bx];
void unlock_drive(int DosDrive);
#pragma aux unlock_drive = \
"mov ax,0x440d" \
"mov cx,0x86a" \
"inc bx" \
"int 0x21" \
parm [bx];
void truename(char far *dest, const char *src);
#pragma aux truename = \
"mov ah,0x60" \
@ -435,10 +453,10 @@ int2526readwrite(int DosDrive, void *diskReadPacket, unsigned intno)
return regs.x.cflag;
}
#define absread(int DosDrive, int foo, int cx, void *diskReadPacket) \
#define absread(DosDrive, foo, cx, diskReadPacket) \
int2526readwrite(DosDrive, diskReadPacket, 0x25)
#define abswrite(int DosDrive, int foo, int cx, void *diskReadPacket) \
#define abswrite(DosDrive, foo, cx, diskReadPacket) \
int2526readwrite(DosDrive, diskReadPacket, 0x26)
#endif
@ -468,6 +486,27 @@ void reset_drive(int DosDrive)
intdos(&regs, &regs);
} /* reset_drive */
void lock_drive(int DosDrive)
{
union REGS regs;
regs.x.ax = 0x440d;
regs.x.cx = 0x84a;
regs.x.dx = 0;
regs.h.bl = DosDrive + 1;
intdos(&regs, &regs);
} /* lock_drive */
void unlock_drive(int DosDrive)
{
union REGS regs;
regs.x.ax = 0x440d;
regs.x.cx = 0x86a;
regs.h.bl = DosDrive + 1;
intdos(&regs, &regs);
} /* unlock_drive */
void truename(char *dest, const char *src)
{
union REGS regs;
@ -479,7 +518,7 @@ void truename(char *dest, const char *src)
sregs.ds = FP_SEG(src);
regs.x.si = FP_OFF(src);
intdosx(&regs, &regs, &sregs);
} /* reset_drive */
} /* truename */
#endif
@ -585,6 +624,7 @@ VOID put_boot(COUNT drive, BYTE * bsFile, BOOL both)
printf("Reading old bootsector from drive %c:\n", drive + 'A');
#endif
lock_drive(drive);
reset_drive(drive);
/* suggestion: allow reading from a boot sector or image file here */
if (MyAbsReadWrite(drive, 1, 0, oldboot, 0) != 0)
@ -733,6 +773,7 @@ VOID put_boot(COUNT drive, BYTE * bsFile, BOOL both)
close(fd);
} /* if write boot sector file */
reset_drive(drive);
unlock_drive(drive);
} /* put_boot */