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use logical operations instead of / and % to increase the performance

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This commit is contained in:
Stefan Lankes 2011-04-19 20:01:18 +02:00
parent a62b4949ee
commit 3fea08710d
2 changed files with 9 additions and 8 deletions
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16
arch/x86/mm/page.c
View file

@ -640,8 +640,8 @@ int arch_paging_init(void)
* Set the page table and page directory entries for the kernel. We map the kernel's physical address
* to the same virtual address.
*/
npages = ((size_t) &kernel_end - (size_t) &kernel_start) / PAGE_SIZE;
if ((size_t)&kernel_end % PAGE_SIZE)
npages = ((size_t) &kernel_end - (size_t) &kernel_start) >> PAGE_SHIFT;
if ((size_t)&kernel_end & (PAGE_SIZE-1))
npages++;
map_region((size_t)&kernel_start, (size_t)&kernel_start, npages, MAP_KERNEL_SPACE);
@ -686,8 +686,8 @@ int arch_paging_init(void)
for(i=0; i<mb_info->mods_count; i++, mmodule++) {
// map physical address to the same virtual address
npages = (mmodule->mod_end - mmodule->mod_start) / PAGE_SIZE;
if (mmodule->mod_end % PAGE_SIZE)
npages = (mmodule->mod_end - mmodule->mod_start) >> PAGE_SHIFT;
if (mmodule->mod_end & (PAGE_SIZE-1))
npages++;
map_region((size_t) (mmodule->mod_start), (size_t) (mmodule->mod_start), npages, MAP_KERNEL_SPACE);
}
@ -699,17 +699,17 @@ int arch_paging_init(void)
map_region(SCC_BOOTINFO, SCC_BOOTINFO, 1, MAP_KERNEL_SPACE);
// map the initial ramdisk
npages = bootinfo->size / PAGE_SIZE;
if (bootinfo->size % PAGE_SIZE)
npages = bootinfo->size >> PAGE_SHIFT;
if (bootinfo->size & (PAGE_SIZE-1))
npages++;
map_region(bootinfo->addr, bootinfo->addr, npages, MAP_KERNEL_SPACE);
// map SCC's configuration registers
viraddr = map_region(CRB_X0_Y0, CRB_X0_Y0, (CRB_OWN-CRB_X0_Y0+16*1024*1024)/PAGE_SIZE, MAP_KERNEL_SPACE|MAP_NO_CACHE);
viraddr = map_region(CRB_X0_Y0, CRB_X0_Y0, (CRB_OWN-CRB_X0_Y0+16*1024*1024) >> PAGE_SHIFT, MAP_KERNEL_SPACE|MAP_NO_CACHE);
kprintf("Map configuration registers at 0x%x\n", viraddr);
// map SCC's message passing buffers
viraddr = map_region(MPB_X0_Y0, MPB_X0_Y0, (MPB_OWN-MPB_X0_Y0+16*1024*1024)/PAGE_SIZE, MAP_KERNEL_SPACE|MAP_MPE);
viraddr = map_region(MPB_X0_Y0, MPB_X0_Y0, (MPB_OWN-MPB_X0_Y0+16*1024*1024) >> PAGE_SHIFT, MAP_KERNEL_SPACE|MAP_MPE);
kprintf("Map message passing buffers at 0x%x\n", viraddr);
#endif

1
include/metalsvm/config.h.example
View file

@ -32,6 +32,7 @@ extern "C" {
#define KERNEL_STACK_SIZE 8192
#define KMSG_SIZE (128*1024)
#define PAGE_SIZE 4096
#define PAGE_SHIFT 12
#define CACHE_LINE 64
#define MAILBOX_SIZE 8
#define TIMER_FREQ 100 /* in HZ */