120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/* The kernel call implemented in this file:
|
|
* m_type: SYS_UMAP
|
|
*
|
|
* The parameters for this kernel call are:
|
|
* m5_i1: CP_SRC_PROC_NR (process number)
|
|
* m5_s1: CP_SRC_SPACE (segment where address is: T, D, or S)
|
|
* m5_l1: CP_SRC_ADDR (virtual address)
|
|
* m5_l2: CP_DST_ADDR (returns physical address)
|
|
* m5_l3: CP_NR_BYTES (size of datastructure)
|
|
*/
|
|
|
|
#include "kernel/system.h"
|
|
|
|
#include <minix/endpoint.h>
|
|
|
|
#if USE_UMAP
|
|
|
|
/*==========================================================================*
|
|
* do_umap *
|
|
*==========================================================================*/
|
|
PUBLIC int do_umap(struct proc * caller, message * m_ptr)
|
|
{
|
|
/* Map virtual address to physical, for non-kernel processes. */
|
|
int seg_type = m_ptr->CP_SRC_SPACE & SEGMENT_TYPE;
|
|
int seg_index = m_ptr->CP_SRC_SPACE & SEGMENT_INDEX;
|
|
vir_bytes offset = m_ptr->CP_SRC_ADDR;
|
|
int count = m_ptr->CP_NR_BYTES;
|
|
int endpt = (int) m_ptr->CP_SRC_ENDPT;
|
|
int proc_nr, r;
|
|
int naughty = 0;
|
|
phys_bytes phys_addr = 0, lin_addr = 0;
|
|
struct proc *targetpr;
|
|
|
|
/* Verify process number. */
|
|
if (endpt == SELF)
|
|
proc_nr = _ENDPOINT_P(caller->p_endpoint);
|
|
else
|
|
if (! isokendpt(endpt, &proc_nr))
|
|
return(EINVAL);
|
|
targetpr = proc_addr(proc_nr);
|
|
|
|
/* See which mapping should be made. */
|
|
switch(seg_type) {
|
|
case LOCAL_SEG:
|
|
phys_addr = lin_addr = umap_local(targetpr, seg_index, offset, count);
|
|
if(!lin_addr) return EFAULT;
|
|
naughty = 1;
|
|
break;
|
|
case REMOTE_SEG:
|
|
phys_addr = lin_addr = umap_remote(targetpr, seg_index, offset, count);
|
|
if(!lin_addr) return EFAULT;
|
|
naughty = 1;
|
|
break;
|
|
case LOCAL_VM_SEG:
|
|
if(seg_index == MEM_GRANT) {
|
|
vir_bytes newoffset;
|
|
endpoint_t newep;
|
|
int new_proc_nr;
|
|
cp_grant_id_t grant = (cp_grant_id_t) offset;
|
|
|
|
if(verify_grant(targetpr->p_endpoint, ANY, grant, count, 0, 0,
|
|
&newoffset, &newep) != OK) {
|
|
printf("SYSTEM: do_umap: verify_grant in %s, grant %d, bytes 0x%lx, failed, caller %s\n", targetpr->p_name, offset, count, caller->p_name);
|
|
proc_stacktrace(caller);
|
|
return EFAULT;
|
|
}
|
|
|
|
if(!isokendpt(newep, &new_proc_nr)) {
|
|
printf("SYSTEM: do_umap: isokendpt failed\n");
|
|
return EFAULT;
|
|
}
|
|
|
|
/* New lookup. */
|
|
offset = newoffset;
|
|
targetpr = proc_addr(new_proc_nr);
|
|
seg_index = D;
|
|
}
|
|
|
|
if(seg_index == T || seg_index == D || seg_index == S) {
|
|
phys_addr = lin_addr = umap_local(targetpr, seg_index, offset, count);
|
|
} else {
|
|
printf("SYSTEM: bogus seg type 0x%lx\n", seg_index);
|
|
return EFAULT;
|
|
}
|
|
if(!lin_addr) {
|
|
printf("SYSTEM:do_umap: umap_local failed\n");
|
|
return EFAULT;
|
|
}
|
|
if(vm_lookup(targetpr, lin_addr, &phys_addr, NULL) != OK) {
|
|
printf("SYSTEM:do_umap: vm_lookup failed\n");
|
|
return EFAULT;
|
|
}
|
|
if(phys_addr == 0)
|
|
panic("vm_lookup returned zero physical address");
|
|
break;
|
|
default:
|
|
if((r=arch_umap(targetpr, offset, count, seg_type, &lin_addr))
|
|
!= OK)
|
|
return r;
|
|
phys_addr = lin_addr;
|
|
}
|
|
|
|
if(vm_running && !vm_contiguous(targetpr, lin_addr, count)) {
|
|
printf("SYSTEM:do_umap: not contiguous\n");
|
|
return EFAULT;
|
|
}
|
|
|
|
m_ptr->CP_DST_ADDR = phys_addr;
|
|
if(naughty || phys_addr == 0) {
|
|
printf("kernel: umap 0x%x done by %d / %s, pc 0x%lx, 0x%lx -> 0x%lx\n",
|
|
seg_type, caller->p_endpoint, caller->p_name,
|
|
caller->p_reg.pc, offset, phys_addr);
|
|
printf("caller stack: ");
|
|
proc_stacktrace(caller);
|
|
}
|
|
return (phys_addr == 0) ? EFAULT: OK;
|
|
}
|
|
|
|
#endif /* USE_UMAP */
|