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do_safecopy split

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- removes dependency of do_safecopy() on the m_type field of the kcall
  messages.

- instead of do_safecopy() figuring out what action is requested, the
  correct safecopy method is called right away.
This commit is contained in:
Tomas Hruby
2010-06-01 08:51:37 +00:00
parent 8bca982581
commit ebbd319ac0
4 changed files with 33 additions and 37 deletions
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32
kernel/system/do_safecopy.c
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@@ -335,27 +335,25 @@ int access; /* CPF_READ for a copy from granter to grantee, CPF_WRITE
}
/*===========================================================================*
* do_safecopy *
* do_safecopy_to *
*===========================================================================*/
PUBLIC int do_safecopy(struct proc * caller, message * m_ptr)
PUBLIC int do_safecopy_to(struct proc * caller, message * m_ptr)
{
static int access, src_seg, dst_seg;
/* Set src and dst parameters. */
if(m_ptr->m_type == SYS_SAFECOPYFROM) {
src_seg = D;
dst_seg = m_ptr->SCP_SEG;
access = CPF_READ;
} else if(m_ptr->m_type == SYS_SAFECOPYTO) {
src_seg = m_ptr->SCP_SEG;
dst_seg = D;
access = CPF_WRITE;
} else panic("Impossible system call nr.: %d", m_ptr->m_type);
return safecopy(caller, m_ptr->SCP_FROM_TO, caller->p_endpoint,
(cp_grant_id_t) m_ptr->SCP_GID, src_seg, dst_seg,
(cp_grant_id_t) m_ptr->SCP_GID, m_ptr->SCP_SEG, D,
m_ptr->SCP_BYTES, m_ptr->SCP_OFFSET,
(vir_bytes) m_ptr->SCP_ADDRESS, access);
(vir_bytes) m_ptr->SCP_ADDRESS, CPF_WRITE);
}
/*===========================================================================*
* do_safecopy_from *
*===========================================================================*/
PUBLIC int do_safecopy_from(struct proc * caller, message * m_ptr)
{
return safecopy(caller, m_ptr->SCP_FROM_TO, caller->p_endpoint,
(cp_grant_id_t) m_ptr->SCP_GID, D, m_ptr->SCP_SEG,
m_ptr->SCP_BYTES, m_ptr->SCP_OFFSET,
(vir_bytes) m_ptr->SCP_ADDRESS, CPF_READ);
}
/*===========================================================================*