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

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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:
Alan Cox 2010-01-11 16:01:20 +00:00
parent 418f8af3a9
commit ac24a8ea24
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=202085
3 changed files with 6 additions and 13 deletions
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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);
}
/*