t_status architecture_environment_kernel(i_as id)
{
struct
{
at_pdei start;
at_pdei end;
at_pdei index;
} pde;
struct
{
at_ptei start;
at_ptei end;
at_ptei index;
} pte;
i_region useless;
at_cr3 pdbr;
o_as* as;
at_pd pd;
at_pt pt;
o_region* r;
t_uint32 i;
/*
* 1)
*/
if (as_get(id, &as) != STATUS_OK)
MACHINE_ESCAPE("unable to retrieve the address space object");
/*
* 2)
*/
as->machine.pd = _init->machine.pd;
/*
* 3)
*/
if (architecture_paging_pdbr(as->machine.pd,
ARCHITECTURE_REGISTER_CR3_PCE |
ARCHITECTURE_REGISTER_CR3_PWB,
&pdbr) != STATUS_OK)
MACHINE_ESCAPE("unable to build the CR3 register's content");
/*
* 4)
*/
pd = (at_pd)as->machine.pd;
/*
* 5)
*/
if (architecture_paging_import(pd,
pdbr) != STATUS_OK)
MACHINE_ESCAPE("unable to import the kernel page directory");
/*
* 6)
*/
if (architecture_pd_insert(pd,
ARCHITECTURE_PD_MIRROR,
as->machine.pd,
ARCHITECTURE_PDE_PRESENT |
ARCHITECTURE_PDE_RW |
ARCHITECTURE_PDE_SUPERVISOR |
ARCHITECTURE_PDE_PWB |
ARCHITECTURE_PDE_PCE) != STATUS_OK)
MACHINE_ESCAPE("unable to insert the mirroring directory entry");
/*
* 7)
*/
if ((r = malloc(sizeof (o_region))) == NULL)
MACHINE_ESCAPE("unable to allocate memory for the region object");
r->address = ARCHITECTURE_PAGING_ADDRESS(ARCHITECTURE_PD_MIRROR, 0);
r->segment = ID_UNUSED;
r->offset = 0x0;
r->size = ARCHITECTURE_PT_SIZE * ___kaneton$pagesz;
r->options = REGION_OPTION_NONE;
if (region_inject(as->id, r, &useless) != STATUS_OK)
MACHINE_ESCAPE("unable to inject the mirroring region");
/*
* 8)
*/
pde.start = 0;
pte.start = 0;
for (i = 0; i < (_init->nregions + 1); i++)
{
/*
* a)
*/
if (i != _init->nregions)
{
pde.end = ARCHITECTURE_PD_INDEX(_init->regions[i].address);
pte.end = ARCHITECTURE_PT_INDEX(_init->regions[i].address);
}
else
{
pde.end = ARCHITECTURE_PD_SIZE - 1;
pte.end = ARCHITECTURE_PT_SIZE;
}
/*
* b)
*/
for (pde.index = pde.start;
pde.index <= pde.end;
pde.index++)
{
/*
* i)
*/
if ((pde.index != ARCHITECTURE_PD_MIRROR) &&
(pd[pde.index] & ARCHITECTURE_PDE_PRESENT))
{
/*
* #1)
*/
pt = (at_pt)ARCHITECTURE_PDE_ADDRESS(pd[pde.index]);
/*
* #2)
*/
for (pte.index = (pde.index == pde.start ? pte.start : 0);
pte.index < (pde.index == pde.end ?
pte.end : ARCHITECTURE_PT_SIZE);
pte.index++)
{
/*
* #a)
*/
if (pt[pte.index] & ARCHITECTURE_PTE_PRESENT)
{
if (architecture_pt_delete(pt, pte.index) != STATUS_OK)
MACHINE_ESCAPE("unable to delete the page "
"table entry");
}
}
}
}
/*
* c)
*/
if (i != _init->nregions)
{
pde.start = ARCHITECTURE_PD_INDEX(_init->regions[i].address +
_init->regions[i].size);
pte.start = ARCHITECTURE_PT_INDEX(_init->regions[i].address +
_init->regions[i].size);
}
}
/*
* 9)
*/
if (architecture_tlb_flush() != STATUS_OK)
MACHINE_ESCAPE("unable to flush the TLB");
/*
* 10)
*/
_architecture.kernel.pdbr = pdbr;
MACHINE_LEAVE();
}
// FIXME: lot of code has been removed here
t_error map_page(t_paddr paddr, t_vaddr *vaddr)
{
o_as* kas;
t_ia32_pde pde;
t_ia32_pde pte;
t_ia32_directory dir;
t_ia32_table table;
t_ia32_page page;
o_region* oreg;
i_segment segid;
o_segment* segment;
int clear = 0;
REGION_ENTER(region);
if (as_get(kasid, &kas) != ERROR_NONE)
REGION_LEAVE(region, ERROR_UNKNOWN);
if (region_space(kas, PAGESZ, vaddr) != ERROR_NONE)
REGION_LEAVE(region, ERROR_UNKNOWN);
if ((oreg = malloc(sizeof(o_region))) == NULL)
REGION_LEAVE(region, ERROR_UNKNOWN);
oreg->address = *vaddr;
oreg->regid = (i_region)oreg->address;
oreg->opts = REGION_OPT_PRIVILEGED;
oreg->size = PAGESZ;
oreg->offset = 0;
oreg->segid = (i_segment) paddr;
if (region_inject(kasid, oreg) != ERROR_NONE)
REGION_LEAVE(region, ERROR_UNKNOWN);
// Page Dir
dir = kas->machdep.pd;
pde = PDE_ENTRY(*vaddr);
if (pd_get_table(&dir, pde, &table) == ERROR_UNKNOWN)
{
segment_reserve(kasid, PAGESZ, PERM_READ | PERM_WRITE, &segid);
if (segment_get(segid, &segment) != ERROR_NONE)
REGION_LEAVE(region, ERROR_UNKNOWN);
table.rw = PT_WRITABLE;
pt_build(segment->address, &table, 0);
pd_add_table(&dir, pde, table);
clear = 1;
}
table.entries = ENTRY_ADDR(PD_MIRROR, pde);
//fixme
if (clear)
memset((void *)ENTRY_ADDR(PD_MIRROR, pde), '\0', PAGESZ);
// Page Table
pte = PTE_ENTRY(*vaddr);
page.present = 1;
page.addr = paddr;
page.rw = PG_WRITABLE;
pt_add_page(&table, pte, page);
tlb_invalidate(*vaddr);
REGION_LEAVE(region, ERROR_NONE);
}
