Ramon van Handel wrote:
> >well, I imagine that if an "enduser" configures plex86 to have 16Mb
> >physical memory, he expects 16 Mb to be "available" and doesn't want to
> >be bothered with the fact that he "actually" will have 12 Mb available,
> >because our video driver allocates 4Mb physical memory
>
> This is a matter of good documentation. Don't worry about it :)
ok :)
> >register a callback for (IS it possible for multiple plugins to register
> >a callback on the SAME ports?) ->
>
> No, that isn't possible. That would be a bug, anyway (IO port conflicts are
> not allowed!). It would also mean lousy performance.
why? where is the performance "problem"?
> However, I guess we
> could reserve a range of I/O ports for plex86 use, but for now it's not so
> important which port you pick (make it a plugin command line option if you
> wish).
ok, I'll have a go at this tonight when I'm home.
To see if I understand things a bit I collected the information/semi
code that I'll probably end up using:
//TestVIDeo plugin information
#define TVID_PACKET_MAGIC 'TVID'
#define TVID_OUTPUT_PORT 0x2000
typedef enum
{
tvid_init,
tvid_deinit,
tvid_updatevideo
} tvid_action_t;
typedef struct _tvid_packet_t
{
int magic;
tvid_action_t action;
int xres; // x resolution in pixels
int yres; // y resolution in pixels
int *vid_memory_ptr; // pointer to an ARGB888 video screen
} tvid_packet_t;
// The output port handler for TVID_OUTPUT_PORT that receives a DWORD
pointer that points to a tvid_packet_t structure
int tvid_outp_handler(event_t event,int data, int op_size, int
count,void *loc)
{
tvid_packet_t packet;
// event (should be) EVT_OUTPORT
// data (should be) TVID_OUTPUT_PORT
// op_size (should be) 4
// count (should be) 1
// loc (should be) DWORD ptr to tvid_pachet_t structure
// use vm_read_physical(loc,sizeof(tvid_packet_t),&packet) to read the
packet contents
//
// verify tvid packet magic
//
// based upon (packet->action) perform one of the following actions:
//
// init gfx component
// deinit gfx component
// based upon resolution settings do a
vm_read_physical(packet->vid_memory_ptr,....) to gfx screen
}
int plugin_init(plugin_t *plugin, int argc, char *argv[])
{
// save plugin variable
// register tvid_outp_handler
plugin_alloc_outp(plugin,tvid_outp_handler,TVID_OUTPUT_PORT,4);
}
--
Best regards,
Jeroen Janssen
+++
It was hard enough to kill a vampire. You could stake them down and turn
them into dust and ten years later someone drops a drop of blood in the
wrong place and *guess who's back*? They returned more times than raw
broccoli.
-- (Terry Pratchett, Feet of Clay)
+++
