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This commit is contained in:
Bahadir Balban
2008-01-13 13:53:52 +00:00
commit e2b791a3d8
789 changed files with 95825 additions and 0 deletions
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55
tasks/mm0/src/arch-arm/mm.c Normal file
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/*
* Copyright (C) 2007 Bahadir Balban
*/
#include <arch/mm.h>
/* Extracts generic protection flags from architecture-specific pte */
unsigned int vm_prot_flags(pte_t pte)
{
unsigned int vm_prot_flags = 0;
unsigned int rw_flags = __MAP_USR_RW_FLAGS & PTE_PROT_MASK;
unsigned int ro_flags = __MAP_USR_RO_FLAGS & PTE_PROT_MASK;
/* Clear non-protection flags */
pte &= PTE_PROT_MASK;;
if (pte == ro_flags)
vm_prot_flags = VM_READ | VM_EXEC;
else if (pte == rw_flags)
vm_prot_flags = VM_READ | VM_WRITE | VM_EXEC;
else
vm_prot_flags = VM_NONE;
return vm_prot_flags;
}
/*
* PTE STATES:
* PTE type field: 00 (Translation fault)
* PTE type field correct, AP bits: None (Read or Write access fault)
* PTE type field correct, AP bits: RO (Write access fault)
*/
/* Extracts arch-specific fault parameters and puts them into generic format */
void set_generic_fault_params(struct fault_data *fault)
{
unsigned int prot_flags = vm_prot_flags(fault->kdata->pte);
fault->reason = 0;
if (is_prefetch_abort(fault->kdata->fsr)) {
fault->reason |= VM_READ;
fault->address = fault->kdata->faulty_pc;
} else {
fault->address = fault->kdata->far;
/* Always assume read fault first */
if (prot_flags & VM_NONE)
fault->reason |= VM_READ;
else if (prot_flags & VM_READ)
fault->reason |= VM_WRITE;
else
BUG();
}
}