gh0s7/mckernel
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

add nocache for mmap. usage: void *va = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS | 0x40, -1, 0);

Browse Source
This commit is contained in:
simin
2012-11-11 22:31:32 +09:00
committed by Masamichi Takagi m-takagi@ab.jp.nec.com
parent 06003ec2e2
commit 31098d3d75
3 changed files with 113 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
kernel/syscall.c
View File

@@ -25,7 +25,7 @@
#define SYSCALL_BY_IKC
#define DEBUG_PRINT_SC
//#define DEBUG_PRINT_SC
#ifdef DEBUG_PRINT_SC
#define dkprintf kprintf
@@ -435,12 +435,27 @@ SYSCALL_DECLARE(mmap)
kprintf("syscall.c,!MAP_FIXED,MAP_ANONYMOUS\n");
unsigned long flags = aal_mc_spinlock_lock(&cpu_local_var(current)->vm->memory_range_lock);
unsigned long s = (region->map_end + PAGE_SIZE - 1) & PAGE_MASK;
unsigned long map_end_aligned = region->map_end;
unsigned long len = (aal_mc_syscall_arg1(ctx) + PAGE_SIZE - 1) & PAGE_MASK;
region->map_end =
extend_process_region(cpu_local_var(current),
region->map_start,
region->map_end,
s + len);
dkprintf("SC(%d),syscall.c,mmap,len=%lx", cpuid, len);
#ifdef USE_NOCACHE_MMAP
if ((aal_mc_syscall_arg3(ctx) & 0x40) == 0x40) {
dkprintf("SC(%d),syscall.c,mmap,nocache,len=%lx\n", cpuid, len);
region->map_end = extend_process_nocache_region(
cpu_local_var(current), region->map_start, map_end_aligned,
s + len);
}
else
#endif
{
region->map_end =
extend_process_region(cpu_local_var(current),
region->map_start,
map_end_aligned,
s + len);
}
aal_mc_spinlock_unlock(&cpu_local_var(current)->vm->memory_range_lock, flags);
dkprintf("syscall.c,mmap,map_end=%lx,s+len=%lx\n", region->map_end, s+len);
#ifdef USE_LARGE_PAGES