void l4x_pte_check_empty(struct mm_struct *mm)
{
struct unmap_log_t *log;
int i;
WARN_ON(!irqs_disabled()); // otherwise we need to go non-preemtible
log = this_cpu_ptr(&unmap_log);
if (likely(this_cpu_read(unmap_log.cnt) == 0))
return;
for (i = 0; i < log->cnt; ++i) {
if (mm != log->log[i].mm)
continue;
l4x_printf("L4x: exiting with non-flushed entry: %lx:%lx[sz=%d,r=%x,from=%lx,cpu=%d,num=%d]\n",
log->log[i].mm->context.task,
log->log[i].addr, log->log[i].size,
log->log[i].rights,
log->log[i].dbg1, raw_smp_processor_id(), i);
}
l4x_unmap_log_flush();
}
void l4x_unmap_log_flush(void)
{
unsigned i;
struct unmap_log_t *log;
unsigned long flags;
local_irq_save(flags);
log = this_cpu_ptr(&unmap_log);
for (i = 0; i < log->cnt; ++i) {
l4_msgtag_t tag;
struct mm_struct *mm = log->log[i].mm;
if (unlikely(l4_is_invalid_cap(mm->context.task)))
continue;
tag = L4XV_FN(l4_msgtag_t,
l4_task_unmap(mm->context.task,
l4_fpage(log->log[i].addr,
log->log[i].size,
log->log[i].rights),
L4_FP_ALL_SPACES));
if (unlikely(l4_error(tag))) {
l4x_printf("l4_task_unmap error %ld: t=%lx\n",
l4_error(tag), mm->context.task);
WARN_ON(1);
} else if (0)
l4x_printf("flushing(%d) %lx:%08lx[%d,%x]\n",
i, mm->context.task,
log->log[i].addr, log->log[i].size,
log->log[i].rights);
}
log->cnt = 0;
local_irq_restore(flags);
}
void l4x_pte_check_empty(struct mm_struct *mm)
{
if (this_cpu_read(unmap_log.cnt)) {
struct unmap_log_t *log = &__get_cpu_var(unmap_log);
int i;
for (i = 0; i < log->cnt; ++i) {
if (mm != log->log[i].mm)
continue;
l4x_printf("L4x: exiting with non-flushed entry: %lx:%lx[%d,%x]\n",
log->log[i].mm->context.task,
log->log[i].addr, log->log[i].size,
log->log[i].rights);
}
}
}
static void l4x_flush_page(struct mm_struct *mm,
unsigned long address,
unsigned long vaddr,
int size,
unsigned long flush_rights, unsigned long caller)
{
l4_msgtag_t tag;
if (IS_ENABLED(CONFIG_ARM))
return;
if (mm && mm->context.l4x_unmap_mode == L4X_UNMAP_MODE_SKIP)
return;
if ((address & PAGE_MASK) == 0)
address = PAGE0_PAGE_ADDRESS;
if (likely(mm)) {
unmap_log_add(mm, vaddr, size, flush_rights, caller);
return;
}
/* do the real flush */
if (mm && !l4_is_invalid_cap(mm->context.task)) {
/* Direct flush in the child, use virtual address in the
* child address space */
tag = L4XV_FN(l4_msgtag_t,
l4_task_unmap(mm->context.task,
l4_fpage(vaddr & PAGE_MASK, size,
flush_rights),
L4_FP_ALL_SPACES));
} else {
/* Flush all pages in all childs using the 'physical'
* address known in the Linux server */
tag = L4XV_FN(l4_msgtag_t,
l4_task_unmap(L4RE_THIS_TASK_CAP,
l4_fpage(address & PAGE_MASK, size,
flush_rights),
L4_FP_OTHER_SPACES));
}
if (l4_error(tag))
l4x_printf("l4_task_unmap error %ld\n", l4_error(tag));
}
static int __init l4x_module_init(void)
{
printk("Hi from the sample module\n");
l4x_printf("sample module: Also a warm welcome to the console\n");
return 0;
}
static void __exit l4x_module_exit(void)
{
l4x_printf("Bye from sample module\n");
}
static void l4x_flush_page(struct mm_struct *mm,
unsigned long address,
unsigned long vaddr,
int size,
unsigned long flush_rights)
{
l4_msgtag_t tag;
if (mm && mm->context.l4x_unmap_mode == L4X_UNMAP_MODE_SKIP)
return;
/* some checks: */
if (address > 0x80000000UL) {
unsigned long remap;
remap = find_ioremap_entry(address);
/* VU: it may happen, that memory is not remapped but mapped in
* user space, if a task mmaps /dev/mem but never accesses it.
* Therefore, we fail silently...
*/
if (!remap)
return;
address = remap;
} else if ((address & PAGE_MASK) == 0)
address = PAGE0_PAGE_ADDRESS;
#if 0
/* only for debugging */
else {
if ((address >= (unsigned long)high_memory)
&& (address < 0x80000000UL)) {
printk("flushing non physical page (0x%lx)\n",
address);
enter_kdebug("flush_page: non physical page");
}
}
#endif
/* do the real flush */
if (mm && !l4_is_invalid_cap(mm->context.task)) {
L4XV_V(f);
if (!mm->context.task)
l4x_printf("%s: Ups, task == 0\n", __func__);
/* Direct flush in the child, use virtual address in the
* child address space */
L4XV_L(f);
tag = l4_task_unmap(mm->context.task,
l4_fpage(vaddr & PAGE_MASK, size, flush_rights),
L4_FP_ALL_SPACES);
L4XV_U(f);
} else {
L4XV_V(f);
/* Flush all pages in all childs using the 'physical'
* address known in the Linux server */
L4XV_L(f);
tag = l4_task_unmap(L4RE_THIS_TASK_CAP,
l4_fpage(address & PAGE_MASK, size, flush_rights),
L4_FP_OTHER_SPACES);
L4XV_U(f);
}
if (l4_error(tag))
l4x_printf("l4_task_unmap error %ld\n", l4_error(tag));
}