tools/kvm/framebuffer.c

   1 #include "kvm/framebuffer.h"
   2
   3 #include <linux/kernel.h>
   4 #include <linux/list.h>
   5 #include <stdlib.h>
   6 #include <sys/mman.h>
   7
   8 static LIST_HEAD(framebuffers);
   9
  10 struct framebuffer *fb__register(struct framebuffer *fb)
  11 {
  12         INIT_LIST_HEAD(&fb->node);
  13         list_add(&fb->node, &framebuffers);
  14
  15         return fb;
  16 }
  17
  18 int fb__attach(struct framebuffer *fb, struct fb_target_operations *ops)
  19 {
  20         if (fb->nr_targets >= FB_MAX_TARGETS)
  21                 return -1;
  22
  23         fb->targets[fb->nr_targets++] = ops;
  24
  25         return 0;
  26 }
  27
  28 static int start_targets(struct framebuffer *fb)
  29 {
  30         unsigned long i;
  31
  32         for (i = 0; i < fb->nr_targets; i++) {
  33                 struct fb_target_operations *ops = fb->targets[i];
  34                 int err = 0;
  35
  36                 if (ops->start)
  37                         err = ops->start(fb);
  38
  39                 if (err)
  40                         return err;
  41         }
  42
  43         return 0;
  44 }
  45
  46 int fb__start(void)
  47 {
  48         struct framebuffer *fb;
  49
  50         list_for_each_entry(fb, &framebuffers, node) {
  51                 int err;
  52
  53                 err = start_targets(fb);
  54                 if (err)
  55                         return err;
  56         }
  57
  58         return 0;
  59 }
  60
  61 void fb__stop(void)
  62 {
  63         struct framebuffer *fb;
  64
  65         list_for_each_entry(fb, &framebuffers, node) {
  66                 munmap(fb->mem, fb->mem_size);
  67         }
  68 }