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Simplify pmap_growkernel(), making the i386 version more like the amd64

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version.

MFC after:	3 weeks
This commit is contained in:
Alan Cox 2010-03-27 18:24:27 +00:00
parent 0d9014f354
commit a57d0d8e1d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=205773
1 changed files with 5 additions and 18 deletions
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23
sys/i386/i386/pmap.c
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@ -207,8 +207,8 @@ vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */
int pgeflag = 0; /* PG_G or-in */
int pseflag = 0; /* PG_PS or-in */
static int nkpt;
vm_offset_t kernel_vm_end;
static int nkpt = NKPT;
vm_offset_t kernel_vm_end = KERNBASE + NKPT * NBPDR;
extern u_int32_t KERNend;
extern u_int32_t KPTphys;
@ -395,7 +395,6 @@ pmap_bootstrap(vm_paddr_t firstaddr)
mtx_lock_spin(&allpmaps_lock);
LIST_INSERT_HEAD(&allpmaps, kernel_pmap, pm_list);
mtx_unlock_spin(&allpmaps_lock);
nkpt = NKPT;
/*
* Reserve some special page table entries/VA space for temporary
@ -2032,24 +2031,12 @@ pmap_growkernel(vm_offset_t addr)
pd_entry_t newpdir;
mtx_assert(&kernel_map->system_mtx, MA_OWNED);
if (kernel_vm_end == 0) {
kernel_vm_end = KERNBASE;
nkpt = 0;
while (pdir_pde(PTD, kernel_vm_end)) {
kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1);
nkpt++;
if (kernel_vm_end - 1 >= kernel_map->max_offset) {
kernel_vm_end = kernel_map->max_offset;
break;
}
}
}
addr = roundup2(addr, PAGE_SIZE * NPTEPG);
addr = roundup2(addr, NBPDR);
if (addr - 1 >= kernel_map->max_offset)
addr = kernel_map->max_offset;
while (kernel_vm_end < addr) {
if (pdir_pde(PTD, kernel_vm_end)) {
kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1);
kernel_vm_end = (kernel_vm_end + NBPDR) & ~PDRMASK;
if (kernel_vm_end - 1 >= kernel_map->max_offset) {
kernel_vm_end = kernel_map->max_offset;
break;
@ -2072,7 +2059,7 @@ pmap_growkernel(vm_offset_t addr)
pdir_pde(KPTD, kernel_vm_end) = pgeflag | newpdir;
pmap_kenter_pde(kernel_vm_end, newpdir);
kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1);
kernel_vm_end = (kernel_vm_end + NBPDR) & ~PDRMASK;
if (kernel_vm_end - 1 >= kernel_map->max_offset) {
kernel_vm_end = kernel_map->max_offset;
break;