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Safe I/O and ioctl functions

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This commit is contained in:
Ben Gras 2006-06-20 08:56:15 +00:00
parent 60bbcab13f
commit 5350645c86
2 changed files with 77 additions and 23 deletions
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2
drivers/memory/Makefile
View file

@ -14,7 +14,7 @@ MAKE = exec make
CC = exec cc
CFLAGS = -I$i
LDFLAGS = -i
LIBS = -lsys -lsysutil
LIBS = -lsysutil -lsys
# imgrd_s.s is the ACK assembler version of the ramdisk. For more portability,
# use the C version imgrd.c. However, the C compiler takes too much memory

98
drivers/memory/memory.c
View file

@ -40,10 +40,10 @@ extern int errno; /* error number for PM calls */
FORWARD _PROTOTYPE( char *m_name, (void) );
FORWARD _PROTOTYPE( struct device *m_prepare, (int device) );
FORWARD _PROTOTYPE( int m_transfer, (int proc_nr, int opcode, off_t position,
iovec_t *iov, unsigned nr_req) );
iovec_t *iov, unsigned nr_req, int safe));
FORWARD _PROTOTYPE( int m_do_open, (struct driver *dp, message *m_ptr) );
FORWARD _PROTOTYPE( void m_init, (void) );
FORWARD _PROTOTYPE( int m_ioctl, (struct driver *dp, message *m_ptr) );
FORWARD _PROTOTYPE( int m_ioctl, (struct driver *dp, message *m_ptr, int safe));
FORWARD _PROTOTYPE( void m_geometry, (struct partition *entry) );
/* Entry points to this driver. */
@ -115,21 +115,25 @@ int device;
/*===========================================================================*
* m_transfer *
*===========================================================================*/
PRIVATE int m_transfer(proc_nr, opcode, position, iov, nr_req)
PRIVATE int m_transfer(proc_nr, opcode, position, iov, nr_req, safe)
int proc_nr; /* process doing the request */
int opcode; /* DEV_GATHER or DEV_SCATTER */
off_t position; /* offset on device to read or write */
iovec_t *iov; /* pointer to read or write request vector */
unsigned nr_req; /* length of request vector */
int safe; /* safe copies */
{
/* Read or write one the driver's minor devices. */
phys_bytes mem_phys;
int seg;
unsigned count, left, chunk;
vir_bytes user_vir;
vir_bytes user_vir, vir_offset = 0;
phys_bytes user_phys;
struct device *dv;
unsigned long dv_size;
int s;
int s, r;
static int n = 0;
/* Get minor device number and check for /dev/null. */
dv = &m_geom[m_device];
@ -157,9 +161,24 @@ unsigned nr_req; /* length of request vector */
seg = m_seg[m_device];
if (opcode == DEV_GATHER) { /* copy actual data */
sys_vircopy(SELF,seg,position, proc_nr,D,user_vir, count);
if(safe) {
r=sys_safecopyto(proc_nr, user_vir, vir_offset,
position, count, seg);
} else {
r=sys_vircopy(SELF,seg,position,
proc_nr,D,user_vir+vir_offset, count);
}
} else {
sys_vircopy(proc_nr,D,user_vir, SELF,seg,position, count);
if(safe) {
r=sys_safecopyfrom(proc_nr, user_vir, vir_offset,
position, count, seg);
} else {
r=sys_vircopy(proc_nr,D,user_vir+vir_offset,
SELF,seg,position, count);
}
}
if(r != OK) {
panic("MEM","I/O copy failed",r);
}
break;
@ -168,12 +187,16 @@ unsigned nr_req; /* length of request vector */
if (position >= dv_size) return(OK); /* check for EOF */
if (position + count > dv_size) count = dv_size - position;
mem_phys = cv64ul(dv->dv_base) + position;
if((r=sys_umap(proc_nr, safe ? GRANT_SEG : D, user_vir,
count + vir_offset, &user_phys)) != OK) {
panic("MEM","sys_umap failed in m_transfer",r);
}
if (opcode == DEV_GATHER) { /* copy data */
sys_physcopy(NONE, PHYS_SEG, mem_phys,
proc_nr, D, user_vir, count);
NONE, PHYS_SEG, user_phys + vir_offset, count);
} else {
sys_physcopy(proc_nr, D, user_vir,
sys_physcopy(NONE, PHYS_SEG, user_phys + vir_offset,
NONE, PHYS_SEG, mem_phys, count);
}
break;
@ -181,14 +204,22 @@ unsigned nr_req; /* length of request vector */
/* Null byte stream generator. */
case ZERO_DEV:
if (opcode == DEV_GATHER) {
size_t suboffset = 0;
left = count;
while (left > 0) {
chunk = (left > ZERO_BUF_SIZE) ? ZERO_BUF_SIZE : left;
if (OK != (s=sys_vircopy(SELF, D, (vir_bytes) dev_zero,
proc_nr, D, user_vir, chunk)))
if(safe) {
s=sys_safecopyto(proc_nr, user_vir,
vir_offset+suboffset, (vir_bytes) dev_zero, chunk, D);
} else {
s=sys_vircopy(SELF, D, (vir_bytes) dev_zero,
proc_nr, D, user_vir + vir_offset+suboffset,
chunk);
}
if(s != OK)
report("MEM","sys_vircopy failed", s);
left -= chunk;
user_vir += chunk;
suboffset += chunk;
}
}
break;
@ -198,11 +229,21 @@ unsigned nr_req; /* length of request vector */
if (position + count > dv_size) count = dv_size - position;
if (opcode == DEV_GATHER) { /* copy actual data */
sys_vircopy(SELF, D, (vir_bytes)&imgrd[position],
proc_nr, D, user_vir, count);
if(safe) {
s=sys_safecopyto(proc_nr, user_vir, vir_offset,
(vir_bytes)&imgrd[position], count, D);
} else {
s=sys_vircopy(SELF, D, (vir_bytes)&imgrd[position],
proc_nr, D, user_vir+vir_offset, count);
}
} else {
sys_vircopy(proc_nr, D, user_vir,
if(safe) {
s=sys_safecopyfrom(proc_nr, user_vir, vir_offset,
(vir_bytes)&imgrd[position], count, D);
} else {
s=sys_vircopy(proc_nr, D, user_vir+vir_offset,
SELF, D, (vir_bytes)&imgrd[position], count);
}
}
break;
@ -213,8 +254,8 @@ unsigned nr_req; /* length of request vector */
/* Book the number of bytes transferred. */
position += count;
iov->iov_addr += count;
if ((iov->iov_size -= count) == 0) { iov++; nr_req--; }
vir_offset += count;
if ((iov->iov_size -= count) == 0) { iov++; nr_req--; vir_offset = 0; }
}
return(OK);
@ -307,7 +348,7 @@ PRIVATE void m_init()
if (OK != (s=sys_getmachine(&machine))) {
panic("MEM","Couldn't get machine information.",s);
}
if (! machine.protected) {
if (! machine.prot) {
m_geom[MEM_DEV].dv_size = cvul64(0x100000); /* 1M for 8086 systems */
} else {
#if _WORD_SIZE == 2
@ -328,9 +369,10 @@ PRIVATE void m_init()
/*===========================================================================*
* m_ioctl *
*===========================================================================*/
PRIVATE int m_ioctl(dp, m_ptr)
PRIVATE int m_ioctl(dp, m_ptr, safe)
struct driver *dp; /* pointer to driver structure */
message *m_ptr; /* pointer to control message */
int safe;
{
/* I/O controls for the memory driver. Currently there is one I/O control:
* - MIOCRAMSIZE: to set the size of the RAM disk.
@ -356,8 +398,14 @@ message *m_ptr; /* pointer to control message */
ramdev_size= m_ptr->POSITION;
#else
/* Get request structure */
s= sys_vircopy(m_ptr->IO_ENDPT, D, (vir_bytes)m_ptr->ADDRESS,
if(safe) {
s= sys_safecopyfrom(m_ptr->IO_ENDPT, (vir_bytes)m_ptr->IO_GRANT,
0, (vir_bytes)&ramdev_size, sizeof(ramdev_size), D);
} else {
s= sys_vircopy(m_ptr->IO_ENDPT, D, (vir_bytes)m_ptr->ADDRESS,
SELF, D, (vir_bytes)&ramdev_size, sizeof(ramdev_size));
}
if (s != OK)
return s;
#endif
@ -408,8 +456,14 @@ message *m_ptr; /* pointer to control message */
do_map= (m_ptr->REQUEST == MIOCMAP); /* else unmap */
/* Get request structure */
r= sys_vircopy(m_ptr->IO_ENDPT, D, (vir_bytes)m_ptr->ADDRESS,
if(safe) {
r= sys_safecopyfrom(m_ptr->IO_ENDPT, (vir_bytes)m_ptr->IO_GRANT,
0, (vir_bytes)&mapreq, sizeof(mapreq), D);
} else {
r= sys_vircopy(m_ptr->IO_ENDPT, D, (vir_bytes)m_ptr->ADDRESS,
SELF, D, (vir_bytes)&mapreq, sizeof(mapreq));
}
if (r != OK)
return r;
r= sys_vm_map(m_ptr->IO_ENDPT, do_map,
@ -418,7 +472,7 @@ message *m_ptr; /* pointer to control message */
}
default:
return(do_diocntl(&m_dtab, m_ptr));
return(do_diocntl(&m_dtab, m_ptr, safe));
}
return(OK);
}