diff options
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/i386/pmap.c | 9 | ||||
| -rw-r--r-- | sys/i386/include/vmparam.h | 8 |
2 files changed, 16 insertions, 1 deletions
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c index 851372430e0f..68b44e955a11 100644 --- a/sys/i386/i386/pmap.c +++ b/sys/i386/i386/pmap.c @@ -375,6 +375,15 @@ pmap_bootstrap(vm_paddr_t firstaddr) int i; /* + * Add a physical memory segment (vm_phys_seg) corresponding to the + * preallocated kernel page table pages so that vm_page structures + * representing these pages will be created. The vm_page structures + * are required for promotion of the corresponding kernel virtual + * addresses to superpage mappings. + */ + vm_phys_add_seg(KPTphys, KPTphys + ptoa(nkpt)); + + /* * Initialize the first available kernel virtual address. However, * using "firstaddr" may waste a few pages of the kernel virtual * address space, because locore may not have mapped every physical diff --git a/sys/i386/include/vmparam.h b/sys/i386/include/vmparam.h index 975b30231b62..5dc56692adc8 100644 --- a/sys/i386/include/vmparam.h +++ b/sys/i386/include/vmparam.h @@ -64,9 +64,15 @@ #endif /* - * The physical address space is densely populated. + * Choose between DENSE and SPARSE based on whether lower execution time or + * lower kernel address space consumption is desired. Under PAE, kernel + * address space is often in short supply. */ +#ifdef PAE +#define VM_PHYSSEG_SPARSE +#else #define VM_PHYSSEG_DENSE +#endif /* * The number of PHYSSEG entries must be one greater than the number |