start writing new VBE routines

[dosdemo] / src / dos / vbe.c

diff --git a/src/dos/vbe.c b/src/dos/vbe.c
new file mode 100644 (file)
index 0000000..d5d75df
--- /dev/null
+++ b/src/dos/vbe.c
@@ -0,0 +1,28 @@
+#include "vbe.h"
+#include "cdpmi.h"
+
+int vbe_getinfo(struct vbe_info *info)
+{
+       void *lowbuf;
+       uint16_t seg, sel;
+       struct dpmi_regs regs = {0};
+
+       if(!(seg = dpmi_alloc(512 / 16, &sel))) {
+               return -1;
+       }
+
+       regs.eax = 0x4f00;
+       regs.es = seg;
+       regs.edi = 0;
+       dpmi_int(0x10, &regs);
+
+       if(regs.eax & 0xff00) {
+               dpmi_free(sel);
+               return -1;
+       }
+
+       lowbuf = (void*)((uint32_t)seg << 4);
+       memcpy(info, lowbuf, sizeof info);
+       dpmi_free(sel);
+       return 0;
+}