135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/* The kernel call implemented in this file:
|
|
* m_type: SYS_VUMAP
|
|
*
|
|
* The parameters for this kernel call are:
|
|
* m10_i1: VUMAP_ENDPT (grant owner, or SELF for local addresses)
|
|
* m10_l1: VUMAP_VADDR (address of virtual (input) vector)
|
|
* m10_i2: VUMAP_VCOUNT (number of elements in virtual vector)
|
|
* m10_l2: VUMAP_OFFSET (offset into first entry of input vector)
|
|
* m10_i3: VUMAP_ACCESS (safecopy access requested for input)
|
|
* m10_l3: VUMAP_PADDR (address of physical (output) vector)
|
|
* m10_i4: VUMAP_PMAX (maximum number of physical vector elements)
|
|
* m10_i1: VUMAP_PCOUNT (upon return: number of elements filled)
|
|
*/
|
|
|
|
#include "kernel/system.h"
|
|
|
|
#include <assert.h>
|
|
|
|
/*===========================================================================*
|
|
* do_vumap *
|
|
*===========================================================================*/
|
|
int do_vumap(struct proc *caller, message *m_ptr)
|
|
{
|
|
/* Map a vector of grants or local virtual addresses to physical addresses.
|
|
* Designed to be used by drivers to perform an efficient lookup of physical
|
|
* addresses for the purpose of direct DMA from/to a remote process.
|
|
*/
|
|
endpoint_t endpt, source, granter;
|
|
struct proc *procp;
|
|
struct vumap_vir vvec[MAPVEC_NR];
|
|
struct vumap_phys pvec[MAPVEC_NR];
|
|
vir_bytes vaddr, paddr, vir_addr, lin_addr;
|
|
phys_bytes phys_addr;
|
|
int i, r, proc_nr, vcount, pcount, pmax, access;
|
|
size_t size, chunk, offset;
|
|
|
|
endpt = caller->p_endpoint;
|
|
|
|
/* Retrieve and check input parameters. */
|
|
source = m_ptr->VUMAP_ENDPT;
|
|
vaddr = (vir_bytes) m_ptr->VUMAP_VADDR;
|
|
vcount = m_ptr->VUMAP_VCOUNT;
|
|
offset = m_ptr->VUMAP_OFFSET;
|
|
access = m_ptr->VUMAP_ACCESS;
|
|
paddr = (vir_bytes) m_ptr->VUMAP_PADDR;
|
|
pmax = m_ptr->VUMAP_PMAX;
|
|
|
|
if (vcount <= 0 || pmax <= 0)
|
|
return EINVAL;
|
|
|
|
if (vcount > MAPVEC_NR) vcount = MAPVEC_NR;
|
|
if (pmax > MAPVEC_NR) pmax = MAPVEC_NR;
|
|
|
|
/* Convert access to safecopy access flags. */
|
|
switch (access) {
|
|
case VUA_READ: access = CPF_READ; break;
|
|
case VUA_WRITE: access = CPF_WRITE; break;
|
|
case VUA_READ|VUA_WRITE: access = CPF_READ|CPF_WRITE; break;
|
|
default: return EINVAL;
|
|
}
|
|
|
|
/* Copy in the vector of virtual addresses. */
|
|
size = vcount * sizeof(vvec[0]);
|
|
|
|
if (data_copy(endpt, vaddr, KERNEL, (vir_bytes) vvec, size) != OK)
|
|
return EFAULT;
|
|
|
|
pcount = 0;
|
|
|
|
/* Go through the input entries, one at a time. Stop early in case the output
|
|
* vector has filled up.
|
|
*/
|
|
for (i = 0; i < vcount && pcount < pmax; i++) {
|
|
size = vvec[i].vv_size;
|
|
if (size <= offset)
|
|
return EINVAL;
|
|
size -= offset;
|
|
|
|
if (source != SELF) {
|
|
r = verify_grant(source, endpt, vvec[i].vv_grant, size, access,
|
|
offset, &vir_addr, &granter);
|
|
if (r != OK)
|
|
return r;
|
|
} else {
|
|
vir_addr = vvec[i].vv_addr + offset;
|
|
granter = endpt;
|
|
}
|
|
|
|
okendpt(granter, &proc_nr);
|
|
procp = proc_addr(proc_nr);
|
|
|
|
lin_addr = umap_local(procp, D, vir_addr, size);
|
|
if (!lin_addr)
|
|
return EFAULT;
|
|
|
|
/* Each virtual range is made up of one or more physical ranges. */
|
|
while (size > 0 && pcount < pmax) {
|
|
chunk = vm_lookup_range(procp, lin_addr, &phys_addr, size);
|
|
|
|
if (!chunk) {
|
|
/* Try to get the memory allocated, unless the memory
|
|
* is supposed to be there to be read from.
|
|
*/
|
|
if (access & CPF_READ)
|
|
return EFAULT;
|
|
|
|
/* This call may suspend the current call, or return an
|
|
* error for a previous invocation.
|
|
*/
|
|
return vm_check_range(caller, procp, lin_addr, size);
|
|
}
|
|
|
|
pvec[pcount].vp_addr = phys_addr;
|
|
pvec[pcount].vp_size = chunk;
|
|
pcount++;
|
|
|
|
lin_addr += chunk;
|
|
size -= chunk;
|
|
}
|
|
|
|
offset = 0;
|
|
}
|
|
|
|
/* Copy out the resulting vector of physical addresses. */
|
|
assert(pcount > 0);
|
|
|
|
size = pcount * sizeof(pvec[0]);
|
|
|
|
r = data_copy_vmcheck(caller, KERNEL, (vir_bytes) pvec, endpt, paddr, size);
|
|
|
|
if (r == OK)
|
|
m_ptr->VUMAP_PCOUNT = pcount;
|
|
|
|
return r;
|
|
}
|