From 7be1d47d247a47058fc945da0ad5962e729117e5 Mon Sep 17 00:00:00 2001 From: Ben Gras Date: Mon, 8 Jun 2009 15:59:29 +0000 Subject: [PATCH] don't always copy for i/o instructions. --- kernel/arch/i386/do_sdevio.c | 18 ++---------------- 1 file changed, 2 insertions(+), 16 deletions(-) diff --git a/kernel/arch/i386/do_sdevio.c b/kernel/arch/i386/do_sdevio.c index 65bfd7e49..2130bd653 100644 --- a/kernel/arch/i386/do_sdevio.c +++ b/kernel/arch/i386/do_sdevio.c @@ -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) { -- 2.44.0