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kernel
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From Eric Luttmann: 

fix for multi-segment device drivers; preserve rq_endaddr between init
calls for the same driver.


git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@722 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2003-10-30 12:22:06 +00:00
parent 8db46073f9
commit a0f4465045
3 changed files with 22 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
kernel/config.c
View File

@ -1384,8 +1384,15 @@ STATIC BOOL LoadDevice(BYTE * pLine, char FAR *top, COUNT mode)
dhp = MK_FP(base, 0);
/* NOTE - Modification for multisegmented device drivers: */
/* In order to emulate the functionallity experienced with other */
/* DOS operating systems, the original 'top' end address is */
/* updated with the end address returned from the INIT request. */
/* The updated end address is then used when issuing the next */
/* INIT request for the following device driver within the file */
for (next_dhp = NULL; FP_OFF(next_dhp) != 0xffff &&
(result = init_device(dhp, szBuf, mode, top)) == SUCCESS;
(result = init_device(dhp, szBuf, mode, &top)) == SUCCESS;
dhp = next_dhp)
{
next_dhp = MK_FP(FP_SEG(dhp), FP_OFF(dhp->dh_next));

2
kernel/init-mod.h
View File

@ -188,7 +188,7 @@ VOID ASMCFUNC FAR cpm_entry(void);
/* main.c */
VOID ASMCFUNC FreeDOSmain(void);
BOOL init_device(struct dhdr FAR * dhp, char * cmdLine,
COUNT mode, char FAR *top);
COUNT mode, char FAR **top);
VOID init_fatal(BYTE * err_msg);
/* prf.c */

17
kernel/main.c
View File

@ -230,7 +230,7 @@ STATIC void init_kernel(void)
/* we can read config.sys later. */
LoL->lastdrive = Config.cfgLastdrive;
/* init_device((struct dhdr FAR *)&blk_dev, NULL, 0, ram_top); */
/* init_device((struct dhdr FAR *)&blk_dev, NULL, 0, &ram_top); */
blk_dev.dh_name[0] = dsk_init();
PreConfig();
@ -485,7 +485,7 @@ STATIC VOID update_dcb(struct dhdr FAR * dhp)
/* If cmdLine is NULL, this is an internal driver */
BOOL init_device(struct dhdr FAR * dhp, char *cmdLine, COUNT mode,
char FAR *r_top)
char FAR **r_top)
{
request rq;
char name[8];
@ -517,7 +517,7 @@ BOOL init_device(struct dhdr FAR * dhp, char *cmdLine, COUNT mode,
rq.r_status = 0;
rq.r_command = C_INIT;
rq.r_length = sizeof(request);
rq.r_endaddr = r_top;
rq.r_endaddr = *r_top;
rq.r_bpbptr = (void FAR *)(cmdLine ? cmdLine : "\n");
rq.r_firstunit = LoL->nblkdev;
@ -546,6 +546,15 @@ BOOL init_device(struct dhdr FAR * dhp, char *cmdLine, COUNT mode,
KernelAllocPara(FP_SEG(rq.r_endaddr) + (FP_OFF(rq.r_endaddr) + 15)/16
- FP_SEG(dhp), 'D', name, mode);
}
/* Another fix for multisegmented device drivers: */
/* To help emulate the functionallity experienced with other DOS */
/* operating systems when calling multiple device drivers in a */
/* single driver file, save the end address returned from the */
/* last INIT call which will then be passed as the end address */
/* for the next INIT call. */
*r_top = (char FAR *)rq.r_endaddr;
}
if (!(dhp->dh_attr & ATTR_CHAR) && (rq.r_nunits != 0))
@ -569,7 +578,7 @@ STATIC void InitIO(void)
/* Initialize driver chain */
setvec(0x29, int29_handler); /* Requires Fast Con Driver */
do {
init_device(device, NULL, 0, lpTop);
init_device(device, NULL, 0, &lpTop);
device = device->dh_next;
}
while (FP_OFF(device) != 0xffff);