// TODO: Error codes
int usart_putc(char data, FILE *unused) {
if (usart_is_initialized) {
while (!(UCSRA & (1 << UDRE))) os_delay(os_get_current_process(), 1000);
UDR = data;
}
return 0;
}
// TODO: Error codes
int usart_getc(FILE *unused) {
if (usart_is_initialized) {
while (!(UCSRA & (1 << RXC))) os_delay(os_get_current_process(), 1000);
return UDR;
}
return 0;
}
/*
* (see above for additional information)
*
* If the 'at' usage count drops to zero with the updated logic, the
* VMA's file pointer is saved; nv_kern_close() uses it to find
* these allocations when the parent file descriptor is closed. This
* will typically happen when the process exits.
*
* Since this is technically a workaround to handle possible fallout
* from misbehaving clients, we addtionally print a warning.
*/
static void
nv_kern_vma_release(struct vm_area_struct *vma)
{
NV_PRINT_VMA(NV_DBG_MEMINFO, vma);
if (NV_VMA_PRIVATE(vma))
{
nv_alloc_t *at = (nv_alloc_t *) NV_VMA_PRIVATE(vma);
if (NV_ATOMIC_DEC_AND_TEST(at->usage_count))
{
static int count = 0;
if ((at->pid == os_get_current_process()) &&
(count++ < NV_MAX_RECURRING_WARNING_MESSAGES))
{
nv_printf(NV_DBG_MEMINFO,
"NVRM: VM: %s: late unmap, comm: %s, 0x%p\n",
__FUNCTION__, current->comm, at);
}
at->file = NV_VMA_FILE(vma);
}
if (!NV_ALLOC_MAPPING_AGP(at->flags))
{
NV_PRINT_AT(NV_DBG_MEMINFO, at);
nv_vm_list_page_count(at->page_table, at->num_pages);
}
}
}
