void enable_paging()
{
PAGE *addr;
PAGE_DIR[0] = make_pde(((uint32_t)KERNEL_PT) >> 12, 0, 1);
for(addr = 0; addr < &_START_OF_TEXT_; ++addr)
KERNEL_PT[PT_NUM_ADDR(addr)] = make_pte(PT_NUM_ADDR(addr), 1, 0, 1);
for(addr = &_START_OF_TEXT_; addr < &_END_OF_RODATA_; ++addr)
KERNEL_PT[PT_NUM_ADDR(addr)] = make_pte(PT_NUM_ADDR(addr), 1, 0, 0);
for(addr = &_START_OF_DATA_; addr < &_END_OF_BSS_STACK_; ++addr)
KERNEL_PT[PT_NUM_ADDR(addr)] = make_pte(PT_NUM_ADDR(addr), 1, 0, 1);
__asm__(
".intel_syntax noprefix;"
"mov cr3, %0;"
"mov eax, cr0;"
"or eax, 0x80010000;"
"mov cr0, eax;"
".att_syntax;"
:
:"r"(PAGE_DIR)
:"eax"
);
}
void map_page(uint32_t *page_dir, uint32_t virt_page_num, uint32_t phy_page_num,
bool global, bool user, bool read_write)
{
uint16_t pd_idx = PD_IDX(virt_page_num),
pt_idx = PT_IDX(virt_page_num);
uint32_t *page_table;
if(!(page_dir[pd_idx] & 0x1)) {
uint32_t pt_page_num = alloc_phy_page(0, 1023);
map_kernel_page(pt_page_num, pt_page_num, true, false, true);
memset((void *)(pt_page_num << 12), 0, 4096);
page_dir[pd_idx] = make_pde(pt_page_num, user, read_write);
}
page_table = (uint32_t *)(page_dir[pd_idx] & 0xfffff000);
page_table[pt_idx] = make_pte(phy_page_num, global, user, read_write);
++phy_mem_rc[phy_page_num];
__asm__ volatile(
".intel_syntax noprefix;"
"mov eax, cr3;"
"mov cr3, eax;"
".att_syntax;"
:::"eax"
);
}
static inline void
create_pte_mapping(unsigned long start, unsigned long end,
unsigned long mode, unsigned long mask, int large)
{
unsigned long addr;
HPTE *htab = (HPTE *)__v2a(htab_data.htab);
unsigned int step;
if (large)
step = 16*MB;
else
step = 4*KB;
for (addr = start; addr < end; addr += step) {
unsigned long vsid = get_kernel_vsid(addr);
unsigned long va = (vsid << 28) | (addr & 0xfffffff);
make_pte(htab, va, (unsigned long)__v2a(addr),
mode, mask, large);
}
}
/*
* Bolt the kernel addr space into the HPT
*/
static void __init iSeries_bolt_kernel(unsigned long saddr, unsigned long eaddr)
{
unsigned long pa;
unsigned long mode_rw = _PAGE_ACCESSED | _PAGE_COHERENT | PP_RWXX;
HPTE hpte;
for (pa=saddr; pa < eaddr ;pa+=PAGE_SIZE) {
unsigned long ea = (unsigned long)__va(pa);
unsigned long vsid = get_kernel_vsid( ea );
unsigned long va = ( vsid << 28 ) | ( pa & 0xfffffff );
unsigned long vpn = va >> PAGE_SHIFT;
unsigned long slot = HvCallHpt_findValid( &hpte, vpn );
if (hpte.dw0.dw0.v) {
/* HPTE exists, so just bolt it */
HvCallHpt_setSwBits(slot, 0x10, 0);
} else {
/* No HPTE exists, so create a new bolted one */
make_pte(NULL, va, (unsigned long)__v2a(ea),
mode_rw, 0, 0);
}
}
}
/* Build a page table for the kernel */
void
init_page(void) {
CR0 cr0;
CR3 cr3;
PDE *pdir = (PDE *)va_to_pa(kpdir);
PTE *ptable = (PTE *)va_to_pa(kptable);
uint32_t pdir_idx, ptable_idx, pframe_idx;
for (pdir_idx = 0; pdir_idx < NR_PDE; pdir_idx ++) {
make_invalid_pde(&pdir[pdir_idx]);
}
pframe_idx = 0;
for (pdir_idx = 0; pdir_idx < PHY_MEM / PD_SIZE; pdir_idx ++) {
make_pde(&pdir[pdir_idx], ptable);
make_pde(&pdir[pdir_idx + KOFFSET / PD_SIZE], ptable);
for (ptable_idx = 0; ptable_idx < NR_PTE; ptable_idx ++) {
make_pte(ptable, (void*)(pframe_idx << 12));
pframe_idx ++;
ptable ++;
}
}
/* make CR3 to be the entry of page directory */
cr3.val = 0;
cr3.page_directory_base = ((uint32_t)pdir) >> 12;
write_cr3(&cr3);
/* set PG bit in CR0 to enable paging */
cr0.val = read_cr0();
cr0.paging = 1;
write_cr0(&cr0);
/* Now we can access global variables!
* Store CR3 in the global variable for future use. */
kcr3.val = cr3.val;
}
void create_video_mapping() {
/* TODO: create an identical mapping from virtual memory area
* [0xa0000, 0xa0000 + SCR_SIZE) to physical memory area
* [0xa0000, 0xa0000 + SCR_SIZE) for user program. You may define
* some page tables to create this mapping.
*/
PDE *pdir = (PDE *)get_updir();
PTE *ptable = (PTE *)va_to_pa(vdtable);
// ptable += (SCR_SIZE / PAGE_SIZE + 1) * PAGE_SIZE;
pdir->val = make_pde(vdtable);
// pdir[0 + KOFFSET / PT_SIZE].val = make_pde(vdtable);
// ptable --;
uint32_t pframe_addr = VMEM_ADDR;
int i=0;
for(; i<=0xf; i++) {
ptable[i+0xa0].val = make_pte(pframe_addr);
pframe_addr += PAGE_SIZE;
}
// panic("please implement me");
}