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Reorganized GetBiosKey a bit -- inlining GetBiosTime saves a slight amount 

of code, converted timeout < 0 to a blocking read instead of polling.


git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@958 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2004-05-24 18:39:49 +00:00
parent c0f1c45d1f
commit b3a2d6bfde
1 changed files with 10 additions and 20 deletions
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30
kernel/config.c
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@ -741,10 +741,7 @@ STATIC struct table * LookUp(struct table *p, BYTE * token)
0x..LL : asciicode in lower half
*/
STATIC ULONG GetBiosTime(VOID)
{
return *(ULONG FAR *) (MK_FP(0x40, 0x6c));
}
#define GetBiosTime() peekl(0, 0x46c)
UWORD GetBiosKey(int timeout)
{
@ -752,26 +749,19 @@ UWORD GetBiosKey(int timeout)
ULONG startTime = GetBiosTime();
for (;;)
if (timeout >= 0) do
{
r.a.x = 0x0100; /* are there keys available ? */
init_call_intr(0x16, &r);
if ((r.flags & 0x40) == 0) /* yes - fetch and return */
{
r.a.x = 0x0000;
init_call_intr(0x16, &r);
return r.a.x;
}
if (timeout < 0)
continue;
if (GetBiosTime() - startTime >= (unsigned)timeout * 18)
break;
if ((unsigned)(GetBiosTime() - startTime) >= timeout * 18u)
return 0xffff;
}
return 0xffff;
while (r.flags & FLG_ZERO);
/* key available or blocking wait (timeout < 0): fetch it */
r.a.x = 0x0000;
init_call_intr(0x16, &r);
return r.a.x;
}
STATIC BOOL SkipLine(char *pLine)