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Change create_pagetables() and pmap_init() so that many fewer page table

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pages have to be preallocated by create_pagetables().
This commit is contained in:
Alan Cox 2008-07-06 22:36:28 +00:00
parent 4d9ac6c76f
commit 4a7c66163b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=180333
2 changed files with 12 additions and 10 deletions
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18
sys/amd64/amd64/pmap.c
View File

@ -440,16 +440,16 @@ create_pagetables(vm_paddr_t *firstaddr)
/* Read-only from zero to physfree */
/* XXX not fully used, underneath 2M pages */
for (i = 0; (i << PAGE_SHIFT) < *firstaddr; i++) {
((pt_entry_t *)KPTphys)[(KERNBASE - VM_MIN_KERNEL_ADDRESS) /
PAGE_SIZE + i] = i << PAGE_SHIFT;
((pt_entry_t *)KPTphys)[(KERNBASE - VM_MIN_KERNEL_ADDRESS) /
PAGE_SIZE + i] |= PG_RW | PG_V | PG_G;
((pt_entry_t *)KPTphys)[i] = i << PAGE_SHIFT;
((pt_entry_t *)KPTphys)[i] |= PG_RW | PG_V | PG_G;
}
/* Now map the page tables at their location within PTmap */
for (i = 0; i < NKPT; i++) {
((pd_entry_t *)KPDphys)[i] = KPTphys + (i << PAGE_SHIFT);
((pd_entry_t *)KPDphys)[i] |= PG_RW | PG_V;
((pd_entry_t *)KPDphys)[(KERNBASE - VM_MIN_KERNEL_ADDRESS) /
NBPDR + i] = KPTphys + (i << PAGE_SHIFT);
((pd_entry_t *)KPDphys)[(KERNBASE - VM_MIN_KERNEL_ADDRESS) /
NBPDR + i] |= PG_RW | PG_V;
}
/* Map from zero to end of allocations under 2M pages */
@ -647,15 +647,17 @@ pmap_init(void)
* Initialize the vm page array entries for the kernel pmap's
* page table pages.
*/
pd = pmap_pde(kernel_pmap, VM_MIN_KERNEL_ADDRESS);
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);
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(VM_MIN_KERNEL_ADDRESS) + i;
mpte->pindex = pmap_pde_pindex(KERNBASE) + i;
mpte->phys_addr = pd[i] & PG_FRAME;
}

4
sys/amd64/include/pmap.h
View File

@ -111,11 +111,11 @@
/* Initial number of kernel page tables. */
#ifndef NKPT
#define NKPT 2688
#define NKPT 32
#endif
#define NKPML4E 1 /* number of kernel PML4 slots */
#define NKPDPE howmany(NKPT, NPDEPG)/* number of kernel PDP slots */
#define NKPDPE 6 /* number of kernel PDP slots */
#define NUPML4E (NPML4EPG/2) /* number of userland PML4 pages */
#define NUPDPE (NUPML4E*NPDPEPG)/* number of userland PDP pages */