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Sweden-Number/msdos/devices.c

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/*
* DOS devices
*
* Copyright 1999 Ove Kåven
*/
#include <stdlib.h>
#include <string.h>
#include "wine/winbase16.h"
#include "msdos.h"
#include "miscemu.h"
#include "dosexe.h"
#include "callback.h"
#include "debugtools.h"
#include "pshpack1.h"
typedef struct {
BYTE ljmp1;
RMCBPROC strategy;
BYTE ljmp2;
RMCBPROC interrupt;
} WINEDEV_THUNK;
typedef struct {
BYTE size; /* length of header + data */
BYTE unit; /* unit (block devices only) */
BYTE command;
WORD status;
BYTE reserved[8];
} REQUEST_HEADER;
typedef struct {
REQUEST_HEADER hdr;
BYTE media; /* media descriptor from BPB */
SEGPTR buffer;
WORD count; /* byte/sector count */
WORD sector; /* starting sector (block devices) */
DWORD volume; /* volume ID (block devices) */
} REQ_IO;
typedef struct {
REQUEST_HEADER hdr;
BYTE data;
} REQ_SAFEINPUT;
#include "poppack.h"
#define CON_BUFFER 128
enum strategy { SYSTEM_STRATEGY_NUL, SYSTEM_STRATEGY_CON, NB_SYSTEM_STRATEGIES };
static void *strategy_data[NB_SYSTEM_STRATEGIES];
#define NONEXT ((DWORD)-1)
#define ATTR_STDIN 0x0001
#define ATTR_STDOUT 0x0002
#define ATTR_NUL 0x0004
#define ATTR_CLOCK 0x0008
#define ATTR_FASTCON 0x0010
#define ATTR_RAW 0x0020
#define ATTR_NOTEOF 0x0040
#define ATTR_DEVICE 0x0080
#define ATTR_REMOVABLE 0x0800
#define ATTR_NONIBM 0x2000 /* block devices */
#define ATTR_UNTILBUSY 0x2000 /* char devices */
#define ATTR_IOCTL 0x4000
#define ATTR_CHAR 0x8000
#define CMD_INIT 0
#define CMD_MEDIACHECK 1 /* block devices */
#define CMD_BUILDBPB 2 /* block devices */
#define CMD_INIOCTL 3
#define CMD_INPUT 4 /* read data */
#define CMD_SAFEINPUT 5 /* "non-destructive input no wait", char devices */
#define CMD_INSTATUS 6 /* char devices */
#define CMD_INFLUSH 7 /* char devices */
#define CMD_OUTPUT 8 /* write data */
#define CMD_SAFEOUTPUT 9 /* write data with verify */
#define CMD_OUTSTATUS 10 /* char devices */
#define CMD_OUTFLUSH 11 /* char devices */
#define CMD_OUTIOCTL 12
#define CMD_DEVOPEN 13
#define CMD_DEVCLOSE 14
#define CMD_REMOVABLE 15 /* block devices */
#define CMD_UNTILBUSY 16 /* output until busy */
#define STAT_MASK 0x00FF
#define STAT_DONE 0x0100
#define STAT_BUSY 0x0200
#define STAT_ERROR 0x8000
#define LJMP 0xea
/* prototypes */
static void WINAPI nul_strategy(CONTEXT86*ctx);
static void WINAPI nul_interrupt(CONTEXT86*ctx);
static void WINAPI con_strategy(CONTEXT86*ctx);
static void WINAPI con_interrupt(CONTEXT86*ctx);
/* devices */
typedef struct
{
char name[8];
WORD attr;
RMCBPROC strategy;
RMCBPROC interrupt;
} WINEDEV;
static WINEDEV devs[] =
{
{ "NUL ",
ATTR_CHAR|ATTR_NUL|ATTR_DEVICE,
nul_strategy, nul_interrupt },
{ "CON ",
ATTR_CHAR|ATTR_STDIN|ATTR_STDOUT|ATTR_FASTCON|ATTR_NOTEOF|ATTR_DEVICE,
con_strategy, con_interrupt }
};
#define NR_DEVS (sizeof(devs)/sizeof(WINEDEV))
/* DOS data segment */
typedef struct
{
DOS_LISTOFLISTS lol;
DOS_DEVICE_HEADER dev[NR_DEVS-1];
WINEDEV_THUNK thunk[NR_DEVS];
REQ_IO req;
BYTE buffer[CON_BUFFER];
} DOS_DATASEG;
#define DOS_DATASEG_OFF(xxx) FIELD_OFFSET(DOS_DATASEG, xxx)
DWORD DOS_LOLSeg;
/* the device implementations */
static void do_lret(CONTEXT86*ctx)
{
WORD *stack = CTX_SEG_OFF_TO_LIN(ctx, ctx->SegSs, ctx->Esp);
ctx->Eip = *(stack++);
ctx->SegCs = *(stack++);
ctx->Esp += 2*sizeof(WORD);
}
static void do_strategy(CONTEXT86*ctx, int id, int extra)
{
REQUEST_HEADER *hdr = CTX_SEG_OFF_TO_LIN(ctx, ctx->SegEs, ctx->Ebx);
void **hdr_ptr = strategy_data[id];
if (!hdr_ptr) {
hdr_ptr = calloc(1,sizeof(void *)+extra);
strategy_data[id] = hdr_ptr;
}
*hdr_ptr = hdr;
do_lret(ctx);
}
static REQUEST_HEADER * get_hdr(int id, void**extra)
{
void **hdr_ptr = strategy_data[id];
if (extra)
*extra = hdr_ptr ? (void*)(hdr_ptr+1) : (void *)NULL;
return hdr_ptr ? *hdr_ptr : (void *)NULL;
}
static void WINAPI nul_strategy(CONTEXT86*ctx)
{
do_strategy(ctx, SYSTEM_STRATEGY_NUL, 0);
}
static void WINAPI nul_interrupt(CONTEXT86*ctx)
{
REQUEST_HEADER *hdr = get_hdr(SYSTEM_STRATEGY_NUL, NULL);
/* eat everything and recycle nothing */
switch (hdr->command) {
case CMD_INPUT:
((REQ_IO*)hdr)->count = 0;
hdr->status = STAT_DONE;
break;
case CMD_SAFEINPUT:
hdr->status = STAT_DONE|STAT_BUSY;
break;
default:
hdr->status = STAT_DONE;
}
do_lret(ctx);
}
static void WINAPI con_strategy(CONTEXT86*ctx)
{
do_strategy(ctx, SYSTEM_STRATEGY_CON, sizeof(int));
}
static void WINAPI con_interrupt(CONTEXT86*ctx)
{
int *scan;
REQUEST_HEADER *hdr = get_hdr(SYSTEM_STRATEGY_CON,(void **)&scan);
BIOSDATA *bios = DOSMEM_BiosData();
WORD CurOfs = bios->NextKbdCharPtr;
DOS_LISTOFLISTS *lol = DOSMEM_LOL();
DOS_DATASEG *dataseg = (DOS_DATASEG *)lol;
BYTE *linebuffer = dataseg->buffer;
BYTE *curbuffer = (lol->offs_unread_CON) ?
(((BYTE*)dataseg) + lol->offs_unread_CON) : (BYTE*)NULL;
DOS_DEVICE_HEADER *con = dataseg->dev;
switch (hdr->command) {
case CMD_INPUT:
{
REQ_IO *io = (REQ_IO *)hdr;
WORD count = io->count, len = 0;
BYTE *buffer = CTX_SEG_OFF_TO_LIN(ctx,
SELECTOROF(io->buffer),
(DWORD)OFFSETOF(io->buffer));
hdr->status = STAT_BUSY;
/* first, check whether we already have data in line buffer */
if (curbuffer) {
/* yep, copy as much as we can */
BYTE data = 0;
while ((len<count) && (data != '\r')) {
data = *curbuffer++;
buffer[len++] = data;
}
if (data == '\r') {
/* line buffer emptied */
lol->offs_unread_CON = 0;
curbuffer = NULL;
/* if we're not in raw mode, call it a day*/
if (!(con->attr & ATTR_RAW)) {
hdr->status = STAT_DONE;
io->count = len;
break;
}
} else {
/* still some data left */
lol->offs_unread_CON = curbuffer - (BYTE*)lol;
/* but buffer was filled, we're done */
hdr->status = STAT_DONE;
io->count = len;
break;
}
}
/* if we're in raw mode, we just need to fill the buffer */
if (con->attr & ATTR_RAW) {
while (len<count) {
WORD data;
/* do we have a waiting scancode? */
if (*scan) {
/* yes, store scancode in buffer */
buffer[len++] = *scan;
*scan = 0;
if (len==count) break;
}
/* check for new keyboard input */
while (CurOfs == bios->FirstKbdCharPtr) {
/* no input available yet, so wait... */
Dosvm.Wait( -1, 0 );
}
/* read from keyboard queue (call int16?) */
data = ((WORD*)bios)[CurOfs];
CurOfs += 2;
if (CurOfs >= bios->KbdBufferEnd) CurOfs = bios->KbdBufferStart;
bios->NextKbdCharPtr = CurOfs;
/* if it's an extended key, save scancode */
if (LOBYTE(data) == 0) *scan = HIBYTE(data);
/* store ASCII char in buffer */
buffer[len++] = LOBYTE(data);
}
} else {
/* we're not in raw mode, so we need to do line input... */
while (TRUE) {
WORD data;
/* check for new keyboard input */
while (CurOfs == bios->FirstKbdCharPtr) {
/* no input available yet, so wait... */
Dosvm.Wait( -1, 0 );
}
/* read from keyboard queue (call int16?) */
data = ((WORD*)bios)[CurOfs];
CurOfs += 2;
if (CurOfs >= bios->KbdBufferEnd) CurOfs = bios->KbdBufferStart;
bios->NextKbdCharPtr = CurOfs;
if (LOBYTE(data) == '\r') {
/* it's the return key, we're done */
linebuffer[len++] = LOBYTE(data);
break;
}
else if (LOBYTE(data) >= ' ') {
/* a character */
if ((len+1)<CON_BUFFER) {
linebuffer[len] = LOBYTE(data);
WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), &linebuffer[len++], 1, NULL, NULL);
}
/* else beep, but I don't like noise */
}
else switch (LOBYTE(data)) {
case '\b':
if (len>0) {
len--;
WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), "\b \b", 3, NULL, NULL);
}
break;
}
}
if (len > count) {
/* save rest of line for later */
lol->offs_unread_CON = linebuffer - (BYTE*)lol + count;
len = count;
}
memcpy(buffer, linebuffer, len);
}
hdr->status = STAT_DONE;
io->count = len;
}
break;
case CMD_SAFEINPUT:
if (curbuffer) {
/* some line input waiting */
hdr->status = STAT_DONE;
((REQ_SAFEINPUT*)hdr)->data = *curbuffer;
}
else if (con->attr & ATTR_RAW) {
if (CurOfs == bios->FirstKbdCharPtr) {
/* no input */
hdr->status = STAT_DONE|STAT_BUSY;
} else {
/* some keyboard input waiting */
hdr->status = STAT_DONE;
((REQ_SAFEINPUT*)hdr)->data = ((BYTE*)bios)[CurOfs];
}
} else {
/* no line input */
hdr->status = STAT_DONE|STAT_BUSY;
}
break;
case CMD_INSTATUS:
if (curbuffer) {
/* we have data */
hdr->status = STAT_DONE;
}
else if (con->attr & ATTR_RAW) {
if (CurOfs == bios->FirstKbdCharPtr) {
/* no input */
hdr->status = STAT_DONE|STAT_BUSY;
} else {
/* some keyboard input waiting */
hdr->status = STAT_DONE;
}
} else {
/* no line input */
hdr->status = STAT_DONE|STAT_BUSY;
}
break;
case CMD_INFLUSH:
/* flush line and keyboard queue */
lol->offs_unread_CON = 0;
bios->NextKbdCharPtr = bios->FirstKbdCharPtr;
break;
case CMD_OUTPUT:
case CMD_SAFEOUTPUT:
{
REQ_IO *io = (REQ_IO *)hdr;
BYTE *buffer = CTX_SEG_OFF_TO_LIN(ctx,
SELECTOROF(io->buffer),
(DWORD)OFFSETOF(io->buffer));
DWORD result = 0;
WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), buffer, io->count, &result, NULL);
io->count = result;
hdr->status = STAT_DONE;
}
break;
default:
hdr->status = STAT_DONE;
}
do_lret(ctx);
}
static void InitListOfLists(DOS_LISTOFLISTS *DOS_LOL)
{
/*
Output of DOS 6.22:
0133:0020 6A 13-33 01 CC 00 33 01 59 00 j.3...3.Y.
0133:0030 70 00 00 00 72 02 00 02-6D 00 33 01 00 00 2E 05 p...r...m.3.....
0133:0040 00 00 FC 04 00 00 03 08-92 21 11 E0 04 80 C6 0D .........!......
0133:0050 CC 0D 4E 55 4C 20 20 20-20 20 00 00 00 00 00 00 ..NUL ......
0133:0060 00 4B BA C1 06 14 00 00-00 03 01 00 04 70 CE FF .K...........p..
0133:0070 FF 00 00 00 00 00 00 00-00 01 00 00 0D 05 00 00 ................
0133:0080 00 FF FF 00 00 00 00 FE-00 00 F8 03 FF 9F 70 02 ..............p.
0133:0090 D0 44 C8 FD D4 44 C8 FD-D4 44 C8 FD D0 44 C8 FD .D...D...D...D..
0133:00A0 D0 44 C8 FD D0 44 .D...D
*/
DOS_LOL->CX_Int21_5e01 = 0x0;
DOS_LOL->LRU_count_FCB_cache = 0x0;
DOS_LOL->LRU_count_FCB_open = 0x0;
DOS_LOL->OEM_func_handler = -1; /* not available */
DOS_LOL->INT21_offset = 0x0;
DOS_LOL->sharing_retry_count = 3;
DOS_LOL->sharing_retry_delay = 1;
DOS_LOL->ptr_disk_buf = 0x0;
DOS_LOL->offs_unread_CON = 0x0;
DOS_LOL->seg_first_MCB = 0x0;
DOS_LOL->ptr_first_DPB = 0x0;
DOS_LOL->ptr_first_SysFileTable = 0x0;
DOS_LOL->ptr_clock_dev_hdr = 0x0;
DOS_LOL->ptr_CON_dev_hdr = 0x0;
DOS_LOL->max_byte_per_sec = 512;
DOS_LOL->ptr_disk_buf_info = 0x0;
DOS_LOL->ptr_array_CDS = 0x0;
DOS_LOL->ptr_sys_FCB = 0x0;
DOS_LOL->nr_protect_FCB = 0x0;
DOS_LOL->nr_block_dev = 0x0;
DOS_LOL->nr_avail_drive_letters = 26; /* A - Z */
DOS_LOL->nr_drives_JOINed = 0x0;
DOS_LOL->ptr_spec_prg_names = 0x0;
DOS_LOL->ptr_SETVER_prg_list = 0x0; /* no SETVER list */
DOS_LOL->DOS_HIGH_A20_func_offs = 0x0;
DOS_LOL->PSP_last_exec = 0x0;
DOS_LOL->BUFFERS_val = 99; /* maximum: 99 */
DOS_LOL->BUFFERS_nr_lookahead = 8; /* maximum: 8 */
DOS_LOL->boot_drive = 3; /* C: */
DOS_LOL->flag_DWORD_moves = 0x01; /* i386+ */
DOS_LOL->size_extended_mem = 0xf000; /* very high value */
}
void DOSDEV_InstallDOSDevices(void)
{
DOS_DATASEG *dataseg;
UINT16 seg;
unsigned int n;
/* allocate DOS data segment or something */
DOS_LOLSeg = GlobalDOSAlloc16(sizeof(DOS_DATASEG));
seg = HIWORD(DOS_LOLSeg);
dataseg = MapSL( MAKESEGPTR(LOWORD(DOS_LOLSeg), 0) );
/* initialize the magnificent List Of Lists */
InitListOfLists(&dataseg->lol);
/* Set up first device (NUL) */
dataseg->lol.NUL_dev.next_dev = MAKESEGPTR(seg, DOS_DATASEG_OFF(dev[0]));
dataseg->lol.NUL_dev.attr = devs[0].attr;
dataseg->lol.NUL_dev.strategy = DOS_DATASEG_OFF(thunk[0].ljmp1);
dataseg->lol.NUL_dev.interrupt = DOS_DATASEG_OFF(thunk[0].ljmp2);
memcpy(dataseg->lol.NUL_dev.name, devs[0].name, 8);
/* Set up the remaining devices */
for (n = 1; n < NR_DEVS; n++)
{
dataseg->dev[n-1].next_dev = (n+1) == NR_DEVS ? NONEXT :
MAKESEGPTR(seg, DOS_DATASEG_OFF(dev[n]));
dataseg->dev[n-1].attr = devs[n].attr;
dataseg->dev[n-1].strategy = DOS_DATASEG_OFF(thunk[n].ljmp1);
dataseg->dev[n-1].interrupt = DOS_DATASEG_OFF(thunk[n].ljmp2);
memcpy(dataseg->dev[n-1].name, devs[n].name, 8);
}
/* Set up thunks */
for (n = 0; n < NR_DEVS; n++)
{
dataseg->thunk[n].ljmp1 = LJMP;
dataseg->thunk[n].strategy = (RMCBPROC)DPMI_AllocInternalRMCB(devs[n].strategy);
dataseg->thunk[n].ljmp2 = LJMP;
dataseg->thunk[n].interrupt = (RMCBPROC)DPMI_AllocInternalRMCB(devs[n].interrupt);
}
/* CON is device 1 */
dataseg->lol.ptr_CON_dev_hdr = MAKESEGPTR(seg, DOS_DATASEG_OFF(dev[0]));
}
DWORD DOSDEV_Console(void)
{
return DOSMEM_LOL()->ptr_CON_dev_hdr;
}
DWORD DOSDEV_FindCharDevice(char*name)
{
SEGPTR cur_ptr = MAKESEGPTR(HIWORD(DOS_LOLSeg), FIELD_OFFSET(DOS_LISTOFLISTS,NUL_dev));
DOS_DEVICE_HEADER *cur = DOSMEM_MapRealToLinear(cur_ptr);
char dname[8];
int cnt;
/* get first 8 characters */
strncpy(dname,name,8);
/* if less than 8 characters, pad with spaces */
for (cnt=0; cnt<8; cnt++)
if (!dname[cnt]) dname[cnt]=' ';
/* search for char devices with the right name */
while (cur &&
((!(cur->attr & ATTR_CHAR)) ||
memcmp(cur->name,dname,8))) {
cur_ptr = cur->next_dev;
if (cur_ptr == NONEXT) cur=NULL;
else cur = DOSMEM_MapRealToLinear(cur_ptr);
}
return cur_ptr;
}
static void DOSDEV_DoReq(void*req, DWORD dev)
{
REQUEST_HEADER *hdr = (REQUEST_HEADER *)req;
DOS_DEVICE_HEADER *dhdr;
CONTEXT86 ctx;
char *phdr;
dhdr = DOSMEM_MapRealToLinear(dev);
phdr = ((char*)DOSMEM_LOL()) + DOS_DATASEG_OFF(req);
/* copy request to request scratch area */
memcpy(phdr, req, hdr->size);
/* prepare to call device driver */
memset(&ctx, 0, sizeof(ctx));
/* ES:BX points to request for strategy routine */
ctx.SegEs = HIWORD(DOS_LOLSeg);
ctx.Ebx = DOS_DATASEG_OFF(req);
/* call strategy routine */
ctx.SegCs = SELECTOROF(dev);
ctx.Eip = dhdr->strategy;
DPMI_CallRMProc(&ctx, 0, 0, 0);
/* call interrupt routine */
ctx.SegCs = SELECTOROF(dev);
ctx.Eip = dhdr->interrupt;
DPMI_CallRMProc(&ctx, 0, 0, 0);
/* completed, copy request back */
memcpy(req, phdr, hdr->size);
if (hdr->status & STAT_ERROR) {
switch (hdr->status & STAT_MASK) {
case 0x0F: /* invalid disk change */
/* this error seems to fit the bill */
SetLastError(ER_NotSameDevice);
break;
default:
SetLastError((hdr->status & STAT_MASK) + 0x13);
break;
}
}
}
static int DOSDEV_IO(unsigned cmd, DWORD dev, DWORD buf, int buflen)
{
REQ_IO req;
req.hdr.size=sizeof(req);
req.hdr.unit=0; /* not dealing with block devices yet */
req.hdr.command=cmd;
req.hdr.status=STAT_BUSY;
req.media=0; /* not dealing with block devices yet */
req.buffer=buf;
req.count=buflen;
req.sector=0; /* block devices */
req.volume=0; /* block devices */
DOSDEV_DoReq(&req, dev);
return req.count;
}
int DOSDEV_Peek(DWORD dev, BYTE*data)
{
REQ_SAFEINPUT req;
req.hdr.size=sizeof(req);
req.hdr.unit=0; /* not dealing with block devices yet */
req.hdr.command=CMD_SAFEINPUT;
req.hdr.status=STAT_BUSY;
req.data=0;
DOSDEV_DoReq(&req, dev);
if (req.hdr.status & STAT_BUSY) return 0;
*data = req.data;
return 1;
}
int DOSDEV_Read(DWORD dev, DWORD buf, int buflen)
{
return DOSDEV_IO(CMD_INPUT, dev, buf, buflen);
}
int DOSDEV_Write(DWORD dev, DWORD buf, int buflen, int verify)
{
return DOSDEV_IO(verify?CMD_SAFEOUTPUT:CMD_OUTPUT, dev, buf, buflen);
}
int DOSDEV_IoctlRead(DWORD dev, DWORD buf, int buflen)
{
return DOSDEV_IO(CMD_INIOCTL, dev, buf, buflen);
}
int DOSDEV_IoctlWrite(DWORD dev, DWORD buf, int buflen)
{
return DOSDEV_IO(CMD_OUTIOCTL, dev, buf, buflen);
}
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