mirror of https://github.com/FDOS/kernel.git
initial BIOS disk int 13h wrapper, only passively detects and notes floppy disk change
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/branches/UNSTABLE@1154 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Kenneth J Davis
parent
9c7fd183f4
commit
b4d8701d5c
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@ -56,6 +56,8 @@ FarTabRetn:
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Int2f3:
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cmp ah,12h
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je IntDosCal ; Dos Internal calls
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cmp ah,13h
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je IntDosCal ; Install Int13h Hook
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cmp ah,16h
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je IntDosCal ; Win (Multitasking) Hook
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cmp ah,46h
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@ -41,7 +41,7 @@ BYTE *RcsId =
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#ifdef TSC
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STATIC VOID StartTrace(VOID);
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static bTraceNext = FALSE;
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STATIC bTraceNext = FALSE;
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#endif
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#if 0 /* Very suspicious, passing structure by value??
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@ -1703,6 +1703,9 @@ struct int2f12regs {
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xreg callerARG1; /* used if called from INT2F/12 */
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};
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extern intvec BIOSInt13, UserInt13, BIOSInt19;
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/* WARNING: modifications in `r' are used outside of int2F_12_handler()
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* On input r.AX==0x12xx, 0x4A01 or 0x4A02
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* also handle Windows' DOS notification hooks, r.AH==0x16
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@ -1733,6 +1736,17 @@ VOID ASMCFUNC int2F_12_handler(struct int2f12regs r)
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r.BX = size;
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return;
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}
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else if (r.AH == 0x13) /* set disk interrupt (13h) handler */
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{
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/* set new values for int13h calls, and must return old values */
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register intvec tmp = UserInt13;
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UserInt13 = MK_FP(r.ds, r.DX); /* int13h handler to use */
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r.ds = FP_SEG(tmp); r.DX = FP_OFF(tmp);
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tmp = BIOSInt13;
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BIOSInt13 = MK_FP(r.es, r.BX); /* int13h handler to restore on reboot */
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r.es = FP_SEG(tmp); r.BX = FP_OFF(tmp);
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return;
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}
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else if (r.AH == 0x16) /* Window/Multitasking hooks */
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{
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#ifdef WIN31SUPPORT /* See "DOS Internals" or RBIL under DOSMGR for details */
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@ -1915,9 +1929,8 @@ VOID ASMCFUNC int2F_12_handler(struct int2f12regs r)
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case 0x80: /* Win Release Time-slice */
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{
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/* This function is generally only called in idle loops */
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enable; /* enable interrupts */
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// __emit__(0xf4); /* halt */
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asm hlt;
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__emit__(0xfb); /* sti; enable interrupts */
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__emit__(0xf4); /* hlt; halt until interrupt */
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r.AX = 0;
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/* DebugPrintf(("Release Time Slice\n")); */
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break;
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@ -2259,6 +2272,91 @@ error_exit:
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r.FLAGS |= FLG_CARRY;
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}
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/* how registers pushed on stack prior to calling int wrapper function,
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when returns these are then popped off, so any changes to these
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will effectively set the returned value in these registers
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*/
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struct intXXregs {
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#ifdef I386
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/* preserved 386+ only registers, compiler specific */
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#endif
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UWORD es, ds;
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UWORD di, si, bp;
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xreg b, d, c, a;
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UWORD intreq; /* which interrupt filter request for */
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UWORD flags; /* flags duplicated, one pushed by int call ignored */
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xreg param;
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UWORD ip, cs , oflags;
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/* top item of int caller's stack, possibly additional params */
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};
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/* additional processing for various wrapped/filtered interrupts
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WARNING: this function also called during kernel init phase
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-- int 13h
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filter for BIOS int13h support, only called on int13h error
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for ms-dos compatibility this should at minimal
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watch for disk-change notification and set internal status
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(may be called multiple times in row when BIOS reports same
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change multiple times, ie delays clearing disk change status)
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TODO: move DMA bounday check from int25/26 to here
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Note: use stored user (usually BIOS) hooked int13 handler
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-- int 19h
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clean up prior to a warm reboot
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for ms compatibility this should at a minimal
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restore original (or indicated as original) BIOS int13h handler
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and any others that may be hooked (including this one)
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if himem loaded clear high memory area (clear vdisk signature so himem loads)
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*/
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VOID ASMCFUNC intXX_filter(struct intXXregs r)
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{
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DebugPrintf(("int %02xh filter\n", r.intreq));
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switch(r.intreq)
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{
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case 0x19: /* reboot via bootstrap */
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{
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setvec(0x13, BIOSInt13);
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setvec(0x19, BIOSInt19);
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/* clear vdisk signature if kernel loaded in hma */
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if (version_flags & 0x10)
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fmemset(MK_FP(0xffff, 0x0010),0,512);
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break;
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}
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case 0x13: /* error with disk handler */
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{
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DebugPrintf(("disk error %i [ah=%x] (drive %x)\n", r.a.b.h, r.param.b.h, r.param.b.l));
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DebugPrintf(("bx==(%x) cx==(%x) dx==(%x)\n", r.BX, r.CX, r.DX));
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/* currently just marks floppy as changed on disk change error */
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if ((r.a.b.h == 0x06) && (r.param.b.l < 0x80)) /* diskchange and is it a floppy? */
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{
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register int i;
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/* mark floppy as changed */
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for(i=0; i < blk_dev.dh_name[0]; i++)
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{
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ddt *pddt = getddt(i);
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if (pddt->ddt_driveno == r.param.b.l)
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{
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DebugPrintf(("ddt[%i] match, flags=%04x\n", i, pddt->ddt_descflags));
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if ((pddt->ddt_descflags & DF_CHANGELINE) && /* drive must have changeline support */
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(pddt->ddt_descflags & DF_CURBPBLOCK)) /* and BPB not currently locked (in-use) */
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pddt->ddt_descflags |= DF_DISKCHANGE;
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/* or get dpb pointer from ddt and set dpbp->dpb_flags = M_CHANGED; */
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}
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}
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}
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break;
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}
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default:
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DebugPrintf(("INT_ERROR!\n"));
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break;
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}
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}
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/*
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* 2000/09/04 Brian Reifsnyder
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* Modified interrupts 0x25 & 0x26 to return more accurate error codes.
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@ -652,6 +652,22 @@ _ext_open_action dw 0 ;2DD - extended open action
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_ext_open_attrib dw 0 ;2DF - extended open attrib
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_ext_open_mode dw 0 ;2E1 - extended open mode
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; these 3 placed here so init code and int wrapper can easily access
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; holds pointers to actual disk handler routines and interrupt
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; vectors that we try to restore before a warm reboot
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global _SAVEDIVLST
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_SAVEDIVLST:
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; used by int13 handler and get/set via int 2f/13h
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global _BIOSInt13
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global _UserInt13
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_BIOSInt13 dd 0 ; used to restore int13 on reboot (see int19 wrapper)
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_UserInt13 dd 0 ; actual disk handler used by kernel
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global _BIOSInt19
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_BIOSInt19 dd 0 ; original int19
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; Pad to 0620h
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times (300h - ($ - _internal_data)) db 0
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global _szNames
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@ -846,6 +862,18 @@ initforceEnableA20:
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global __HMARelocationTableStart
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__HMARelocationTableStart:
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global _int13_handler
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extern reloc_call_int13_handler
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_int13_handler: jmp 0:reloc_call_int13_handler
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call near forceEnableA20
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#if 0
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global _int19_handler
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extern reloc_call_int19_handler
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_int19_handler: jmp 0:reloc_call_int19_handler
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call near forceEnableA20
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#endif
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global _int2f_handler
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extern reloc_call_int2f_handler
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_int2f_handler: jmp 0:reloc_call_int2f_handler
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@ -30,6 +30,7 @@
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#include "portab.h"
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#include "init-mod.h"
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#include "dyndata.h"
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#include "debug.h"
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#ifdef VERSION_STRINGS
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static BYTE *mainRcsId =
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@ -48,6 +49,7 @@ STATIC VOID init_internal_devices(void);
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STATIC VOID update_dcb(struct dhdr FAR *);
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STATIC VOID init_kernel(VOID);
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STATIC VOID do_fixup(VOID);
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STATIC VOID signon(VOID);
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STATIC VOID init_shell(VOID);
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STATIC VOID FsConfig(VOID);
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@ -55,6 +57,11 @@ STATIC VOID InitPrinters(VOID);
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STATIC VOID InitSerialPorts(VOID);
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STATIC void CheckContinueBootFromHarddisk(void);
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STATIC void setup_int_vectors(void);
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#define setup_fastprint_hook() setvec(0x29, int29_handler) /* required for printf! */
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void setvec(unsigned char intno, intvec vector);
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#ifdef _MSC_VER
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BYTE _acrtused = 0;
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@ -67,6 +74,7 @@ __segment DosTextSeg = 0;
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#endif
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struct lol FAR * const LoL = &DATASTART;
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intvec FAR * const savedIVs = &SAVEDIVLST;
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void ASMCFUNC FreeDOSmain(void)
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{
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@ -120,14 +128,25 @@ void ASMCFUNC FreeDOSmain(void)
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fmemcpy(&InitKernelConfig, p, sizeof InitKernelConfig);
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}
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setup_int_vectors();
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/* printfs won't work until int29, fast console output hook is installed */
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setup_fastprint_hook();
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/* check if booting from CD before we hook too many interrupts */
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CheckContinueBootFromHarddisk();
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/* display copyright info and kernel emulation status */
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signon();
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init_kernel();
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init_shell();
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/* finish initial HMA segment relocation (move up until DOS=HIGH known) */
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do_fixup();
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/* install DOS API and other interrupt service routines, basic kernel functionality works */
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setup_int_vectors();
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/* initialize all internal variables, process CONFIG.SYS, load drivers, etc */
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init_kernel();
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init_shell();
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init_call_p_0(&Config); /* execute process 0 (the shell) */
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}
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@ -195,6 +214,30 @@ void setvec(unsigned char intno, intvec vector)
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}
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#endif
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/* ensures int vectors we may need to restore are saved */
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STATIC VOID save_int_vectors(VOID)
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{
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/* we create far pointers otherwise compiler sets value
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in initial data segment (IDATA) which does us no good.
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*/
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extern intvec BIOSInt13, UserInt13, BIOSInt19; /* in kernel.asm */
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intvec FAR *pBIOSInt13, FAR *pUserInt13, FAR *pBIOSInt19;
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pBIOSInt13 = MK_FP(FP_SEG(savedIVs), FP_OFF(savedIVs));
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pUserInt13 = pBIOSInt13 + 1;
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pBIOSInt19 = pBIOSInt13 + 2;
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/* store for later use by our replacement int13handler */
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*pBIOSInt13 = getvec(0x13); /* save original BIOS int 0x13 handler */
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*pUserInt13 = *pBIOSInt13; /* default to it for user int 0x13 handler */
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*pBIOSInt19 = getvec(0x19); /* save reboot handler so we can clean up a little */
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DDebugPrintf(("\n")); /* force anything printed to start on next line after BS */
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DDebugPrintf(("BIOSInt13(at %p) is %p\n", pBIOSInt13, *pBIOSInt13));
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DDebugPrintf(("BIOSInt19(at %p) is %p\n", pBIOSInt19, *pBIOSInt19));
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}
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STATIC void setup_int_vectors(void)
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{
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static struct vec
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@ -208,20 +251,27 @@ STATIC void setup_int_vectors(void)
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{ 0x1, FP_OFF(empty_handler) }, /* single step */
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{ 0x3, FP_OFF(empty_handler) }, /* debug breakpoint */
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{ 0x6, FP_OFF(int6_handler) }, /* invalid opcode */
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{ 0x13, FP_OFF(int13_handler) }, /* BIOS disk filter */
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#if 0
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{ 0x19, FP_OFF(int19_handler) }, /* BIOS bootstrap loader, vdisk */
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#endif
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{ 0x20, FP_OFF(int20_handler) },
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{ 0x21, FP_OFF(int21_handler) },
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{ 0x21, FP_OFF(int21_handler) }, /* primary DOS API */
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{ 0x22, FP_OFF(int22_handler) },
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{ 0x24, FP_OFF(int24_handler) },
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{ 0x25, FP_OFF(low_int25_handler) },
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{ 0x25, FP_OFF(low_int25_handler) }, /* DOS abs read/write calls */
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{ 0x26, FP_OFF(low_int26_handler) },
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{ 0x27, FP_OFF(int27_handler) },
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{ 0x28, FP_OFF(int28_handler) },
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{ 0x2a, FP_OFF(int2a_handler) },
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{ 0x2f, FP_OFF(int2f_handler) }
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{ 0x2f, FP_OFF(int2f_handler) } /* multiplex int */
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};
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struct vec *pvec;
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int i;
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save_int_vectors();
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/* install default handlers */
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for (i = 0x23; i <= 0x3f; i++)
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setvec(i, empty_handler);
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for (pvec = vectors; pvec < ENDOF(vectors); pvec++)
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@ -229,7 +279,7 @@ STATIC void setup_int_vectors(void)
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pokeb(0, 0x30 * 4, 0xea);
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pokel(0, 0x30 * 4 + 1, (ULONG)cpm_entry);
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/* these two are in the device driver area LOWTEXT (0x70) */
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/* handlers for int 0x1b and 0x29 are in the device driver area LOWTEXT (0x70) */
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setvec(0x1b, got_cbreak);
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setvec(0x29, int29_handler); /* required for printf! */
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}
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@ -251,14 +301,8 @@ STATIC void printIRQvectors(void)
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}
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#endif
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STATIC void init_kernel(void)
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STATIC void do_fixup(void)
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{
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COUNT i;
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LoL->os_setver_major = LoL->os_major = MAJOR_RELEASE;
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LoL->os_setver_minor = LoL->os_minor = MINOR_RELEASE;
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LoL->rev_number = REVISION_SEQ;
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/* move kernel to high conventional RAM, just below the init code */
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/* Note: kernel.asm actually moves and jumps here, but MoveKernel
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must still be called to do the necessary segment fixups */
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@ -275,6 +319,15 @@ STATIC void init_kernel(void)
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chunk allocated, lpTop. I.e. lpTop is top of free conv memory
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*/
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lpTop = MK_FP(FP_SEG(lpTop) - 0xfff, 0xfff0);
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}
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STATIC void init_kernel(void)
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{
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COUNT i;
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LoL->os_setver_major = LoL->os_major = MAJOR_RELEASE;
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LoL->os_setver_minor = LoL->os_minor = MINOR_RELEASE;
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LoL->rev_number = REVISION_SEQ;
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/* Initialize IO subsystem */
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init_internal_devices();
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