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Kernel: introduce vm_check_range

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David van Moolenbroek 2012-01-09 00:38:29 +01:00
parent 08af3f672b
commit 2a395dd8b4
2 changed files with 30 additions and 0 deletions
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28
kernel/arch/i386/memory.c
View file

@ -531,6 +531,34 @@ PRIVATE void vm_suspend(struct proc *caller, const struct proc *target,
vmrequest = caller;
}
/*===========================================================================*
* vm_check_range *
*===========================================================================*/
PUBLIC int vm_check_range(struct proc *caller, struct proc *target,
vir_bytes vir_addr, size_t bytes)
{
/* Public interface to vm_suspend(), for use by kernel calls. On behalf
* of 'caller', call into VM to check linear virtual address range of
* process 'target', starting at 'vir_addr', for 'bytes' bytes. This
* function assumes that it will called twice if VM returned an error
* the first time (since nothing has changed in that case), and will
* then return the error code resulting from the first call. Upon the
* first call, a non-success error code is returned as well.
*/
int r;
if (!vm_running)
return EFAULT;
if ((caller->p_misc_flags & MF_KCALL_RESUME) &&
(r = caller->p_vmrequest.vmresult) != OK)
return r;
vm_suspend(caller, target, vir_addr, bytes, VMSTYPE_KERNELCALL);
return VMSUSPEND;
}
/*===========================================================================*
* delivermsg *
*===========================================================================*/

2
kernel/proto.h
View file

@ -211,6 +211,8 @@ _PROTOTYPE( void proc_stacktrace, (struct proc *proc) );
_PROTOTYPE( int vm_lookup, (const struct proc *proc, vir_bytes virtual, phys_bytes *result, u32_t *ptent));
_PROTOTYPE( size_t vm_lookup_range, (const struct proc *proc,
vir_bytes vir_addr, phys_bytes *phys_addr, size_t bytes) );
_PROTOTYPE( int vm_check_range, (struct proc *caller,
struct proc *target, vir_bytes vir_addr, size_t bytes) );
_PROTOTYPE( void delivermsg, (struct proc *target));
_PROTOTYPE( void arch_do_syscall, (struct proc *proc) );
_PROTOTYPE( int arch_phys_map, (int index, phys_bytes *addr,