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kernel
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Function 30h (Get DOS Version): Get DOS version from PSP 

- Upon creation, initialize the PSP version field
    to os_setver_minor / os_setver_major.
  - When calling Function 30h, return the contents
    of the current PSP's version field to the caller.
This commit is contained in:
Mondgestein 2019-11-22 12:19:34 +01:00 committed by Kenneth J Davis
parent 61499ae6aa
commit a2ad348ed8
2 changed files with 8 additions and 3 deletions
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9
kernel/inthndlr.c
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@ -726,12 +726,14 @@ dispatch:
/* Get (editable) DOS Version */
case 0x30:
{
psp FAR *p = MK_FP(cu_psp, 0);
if (lr.AL == 1) /* from RBIL, if AL=1 then return version_flags */
lr.BH = version_flags;
else
lr.BH = OEM_ID;
lr.AL = os_setver_major;
lr.AH = os_setver_minor;
lr.AX = p->ps_retdosver;
lr.BL = REVISION_SEQ;
lr.CX = 0; /* do not set this to a serial number!
32RTM won't like non-zero values */
@ -761,8 +763,9 @@ dispatch:
}
}
}
break;
break;
/* Keep Program (Terminate and stay resident) */
case 0x31:

2
kernel/task.c
View File

@ -188,6 +188,8 @@ void new_psp(seg para, seg cur_psp)
p->ps_isv24 = getvec(0x24);
/* parent psp segment set to 0 (see RBIL int21/ah=26) */
p->ps_parent = 0;
/* default system version for int21/ah=30 */
p->ps_retdosver = (os_setver_minor << 8) + os_setver_major;
}
void child_psp(seg para, seg cur_psp, int psize)