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don't always copy for i/o instructions.

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This commit is contained in:
Ben Gras 2009-06-08 15:59:29 +00:00
parent 3765538c76
commit 7be1d47d24
1 changed files with 2 additions and 16 deletions
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18
kernel/arch/i386/do_sdevio.c
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@ -24,6 +24,8 @@
PUBLIC int do_sdevio(m_ptr)
register message *m_ptr; /* pointer to request message */
{
vir_bytes newoffset;
endpoint_t newep;
int proc_nr, proc_nr_e = m_ptr->DIO_VEC_ENDPT;
int count = m_ptr->DIO_VEC_SIZE;
long port = m_ptr->DIO_PORT;
@ -33,7 +35,6 @@ register message *m_ptr; /* pointer to request message */
struct priv *privp;
struct io_range *iorp;
int rem;
static char zero[4096];
vir_bytes addr;
struct proc *destproc;
@ -67,8 +68,6 @@ register message *m_ptr; /* pointer to request message */
/* Check for 'safe' variants. */
if((m_ptr->DIO_REQUEST & _DIO_SAFEMASK) == _DIO_SAFE) {
vir_bytes newoffset;
endpoint_t newep;
/* Map grant address to physical address. */
if(verify_grant(proc_nr_e, who_e,
(vir_bytes) m_ptr->DIO_VEC_ADDR,
@ -103,19 +102,6 @@ register message *m_ptr; /* pointer to request message */
/* current process must be target for phys_* to be OK */
vm_set_cr3(destproc);
rem = count;
addr = m_ptr->DIO_VEC_ADDR;
while(rem > 0) {
int r;
int chunk;
chunk = rem > sizeof(zero) ? sizeof(zero) : rem;
if((r=data_copy_vmcheck(SYSTEM, zero, destproc->p_endpoint,
addr, chunk)) != OK) {
return r;
}
addr += chunk;
rem -= chunk;
}
switch (io_type)
{