d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Simplify pmap_init(). Additionally, correct a harmless misbehavior on i386.

Browse Source 
Specifically, where locore had created large page mappings for the kernel,
the wrong vm page array entries were being initialized.  The vm page array
entries for the pages containing the kernel were being initialized instead
of the vm page array entries for page table pages.

MFC after:	1 week
This commit is contained in:
alc 2010-01-11 16:01:20 +00:00
parent b71264af8e
commit cd3015a67b
3 changed files with 6 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sys/amd64/amd64/pmap.c
View File

@ -664,7 +664,6 @@ pmap_page_init(vm_page_t m)
void
pmap_init(void)
{
pd_entry_t *pd;
vm_page_t mpte;
vm_size_t s;
int i, pv_npg;
@ -673,18 +672,13 @@ pmap_init(void)
* Initialize the vm page array entries for the kernel pmap's
* page table pages.
*/
pd = pmap_pde(kernel_pmap, KERNBASE);
for (i = 0; i < NKPT; i++) {
if ((pd[i] & (PG_PS | PG_V)) == (PG_PS | PG_V))
continue;
KASSERT((pd[i] & PG_V) != 0,
("pmap_init: page table page is missing"));
mpte = PHYS_TO_VM_PAGE(pd[i] & PG_FRAME);
mpte = PHYS_TO_VM_PAGE(KPTphys + (i << PAGE_SHIFT));
KASSERT(mpte >= vm_page_array &&
mpte < &vm_page_array[vm_page_array_size],
("pmap_init: page table page is out of range"));
mpte->pindex = pmap_pde_pindex(KERNBASE) + i;
mpte->phys_addr = pd[i] & PG_FRAME;
mpte->phys_addr = KPTphys + (i << PAGE_SHIFT);
}
/*

2
sys/i386/i386/locore.s
View File

@ -104,9 +104,7 @@ IdlePTD: .long 0 /* phys addr of kernel PTD */
IdlePDPT: .long 0 /* phys addr of kernel PDPT */
#endif
#ifdef SMP
.globl KPTphys
#endif
KPTphys: .long 0 /* phys addr of kernel page tables */
.globl proc0kstack

7
sys/i386/i386/pmap.c
View File

@ -206,6 +206,7 @@ int pseflag = 0; /* PG_PS or-in */
static int nkpt;
vm_offset_t kernel_vm_end;
extern u_int32_t KERNend;
extern u_int32_t KPTphys;
#ifdef PAE
pt_entry_t pg_nx;
@ -659,13 +660,13 @@ pmap_init(void)
* Initialize the vm page array entries for the kernel pmap's
* page table pages.
*/
for (i = 0; i < nkpt; i++) {
mpte = PHYS_TO_VM_PAGE(PTD[i + KPTDI] & PG_FRAME);
for (i = 0; i < NKPT; i++) {
mpte = PHYS_TO_VM_PAGE(KPTphys + (i << PAGE_SHIFT));
KASSERT(mpte >= vm_page_array &&
mpte < &vm_page_array[vm_page_array_size],
("pmap_init: page table page is out of range"));
mpte->pindex = i + KPTDI;
mpte->phys_addr = PTD[i + KPTDI] & PG_FRAME;
mpte->phys_addr = KPTphys + (i << PAGE_SHIFT);
}
/*