//
// Initialize the kernel virtual memory layout for environment e.
// Given a pointer to an allocated page directory, set the e->env_pgdir and e->env_cr3 accordingly,
// and initialize the kernel portion of the new environment's address space.
// Do NOT (yet) map anything into the user portion
// of the environment's virtual address space.
//
void initialize_environment(struct Env* e, uint32* ptr_user_page_directory)
{
// PROJECT 2008: Your code here.
panic("initialize_environment function is not completed yet") ;
// [1] initialize the kernel portion of the new environment's address space.
// [2] set e->env_pgdir and e->env_cr3 accordingly,
//Completes other environment initializations, (envID, status and most of registers)
complete_environment_initialization(e);
}
//
// Initialize the kernel virtual memory layout for environment e.
// Given a pointer to an allocated page directory, set the e->env_pgdir and e->env_cr3 accordingly,
// and initialize the kernel portion of the new environment's address space.
// Do NOT (yet) map anything into the user portion
// of the environment's virtual address space.
//
void initialize_environment(struct Env* e, uint32* ptr_user_page_directory
, unsigned int phys_user_page_directory)
{
//panic("initialize_environment function is not completed yet") ;
// [1] initialize the kernel portion of the new environment's address space.
// [2] set e->env_pgdir and e->env_cr3 accordingly,
int i;
e->env_page_directory = ptr_user_page_directory;
e->env_cr3 = phys_user_page_directory;
//[TODODONE]: copy the kernel area only (to avoid copying the currently shared objects)
for (i = 0 ; i < PDX(USER_TOP) ; i++)
{
e->env_page_directory[i] = 0 ;
}
for (i = PDX(USER_TOP) ; i < 1024 ; i++)
{
e->env_page_directory[i] = ptr_page_directory[i] ;
}
// Allocate the page working set for both kernel and user
#if USE_KHEAP == 1
{
e->__uptr_pws = (struct WorkingSetElement*) USER_PAGES_WS_START;
e->ptr_pageWorkingSet = create_user_page_WS(e->page_WS_max_size);
unsigned int sva = (unsigned int)e->ptr_pageWorkingSet;
uint32 nBytes = sizeof(struct WorkingSetElement) * e->page_WS_max_size;
unsigned int dva = (unsigned int) (e->__uptr_pws);
for(sva = (uint32)(e->ptr_pageWorkingSet); sva < ((uint32)(e->ptr_pageWorkingSet) + nBytes) ; sva+=PAGE_SIZE, dva+=PAGE_SIZE)
{
unsigned int pa = kheap_physical_address(sva);
map_frame(e->env_page_directory, to_frame_info(pa), (void*)dva, PERM_USER);
}
}
#else
{
uint32 env_index = (uint32)(e-envs);
e->__uptr_pws = (struct WorkingSetElement*)
( ((struct Env*)(UENVS+sizeof(struct Env)*env_index))->ptr_pageWorkingSet );
}
#endif
//initialize environment working set
for(i=0; i< (e->page_WS_max_size); i++)
{
e->ptr_pageWorkingSet[i].virtual_address = 0;
e->ptr_pageWorkingSet[i].empty = 1;
e->ptr_pageWorkingSet[i].time_stamp = 0 ;
}
e->page_last_WS_index = 0;
for(i=0; i< __TWS_MAX_SIZE; i++)
{
e->__ptr_tws[i].virtual_address = 0;
e->__ptr_tws[i].empty = 1;
e->__ptr_tws[i].time_stamp = 0 ;
}
e->table_last_WS_index = 0;
e->pageFaultsCounter=0;
e->tableFaultsCounter=0;
e->nModifiedPages=0;
e->nNotModifiedPages=0;
e->shared_free_address = USER_SHARED_MEM_START;
//Completes other environment initializations, (envID, status and most of registers)
complete_environment_initialization(e);
}
