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Add a dumb syscall to force an address+size to be mapped in userspace

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This commit is contained in:
Kevin Lange 2016-12-01 23:23:31 +09:00
parent 5e39becfce
commit f57be44604
1 changed files with 26 additions and 0 deletions
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26
kernel/sys/syscall.c
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@ -581,6 +581,32 @@ static int sys_sysfunc(int fn, char ** args) {
invalidate_tables_at(proc->image.heap_actual);
}
spin_unlock(proc->image.lock);
return 0;
}
case 10:
{
/* Load pages to fit region. */
uintptr_t address = (uintptr_t)args[0];
size_t size = (size_t)args[1];
/* TODO: Other arguments for read/write? */
if (address & 0xFFF) {
size += address & 0xFFF;
address &= 0xFFFFF000;
}
process_t * proc = (process_t *)current_process;
if (proc->group != 0) {
proc = process_from_pid(proc->group);
}
spin_lock(proc->image.lock);
for (size_t x = 0; x < size; x += 0x1000) {
alloc_frame(get_page(address + x, 1, current_directory), 0, 1);
invalidate_tables_at(address + x);
}
spin_unlock(proc->image.lock);
return 0;
}
default: