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Bahadir Balban
2008-01-13 13:53:52 +00:00
commit e2b791a3d8
789 changed files with 95825 additions and 0 deletions
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65
src/api/space.c Normal file
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/*
* Space-related system calls.
*
* Copyright (C) 2007 Bahadir Balban
*/
#include <l4/generic/tcb.h>
#include INC_API(syscall.h)
#include INC_SUBARCH(mm.h)
#include <l4/api/errno.h>
/* NOTE:
* For lazy mm switching, a list of newly created mappings that are common to
* all tasks (e.g. any mapping done in the kernel) can be kept here so that when
* a new task is scheduled, the same mappings are copied to its page tables as
* well. struct list_head new_mappings;
*/
int sys_map(struct syscall_args *regs)
{
unsigned long phys = regs->r0;
unsigned long virt = regs->r1;
unsigned long npages = regs->r2;
unsigned long flags = regs->r3;
unsigned int tid = regs->r4;
struct ktcb *target;
if (tid == current->tid) { /* The easiest case */
target = current;
goto found;
} else /* else search the tcb from its hash list */
if ((target = find_task(tid)))
goto found;
BUG();
return -EINVAL;
found:
add_mapping_pgd(phys, virt, npages << PAGE_BITS, flags, target->pgd);
return 0;
}
int sys_unmap(struct syscall_args *regs)
{
unsigned long virt = regs->r0;
unsigned long npages = regs->r1;
unsigned int tid = regs->r2;
struct ktcb *target;
if (tid == current->tid) { /* The easiest case */
target = current;
goto found;
} else /* else search the tcb from its hash list */
if ((target = find_task(tid)))
goto found;
BUG();
return -EINVAL;
found:
for (int i = 0; i < npages; i++)
remove_mapping_pgd(virt, target->pgd);
return 0;
}