Changeset 100 for trunk/hal/x86_64/drivers/soclib_tty.c

Timestamp:

Jun 29, 2017, 3:49:52 PM (7 years ago)

Author:

max@…

Message:

add a part of the tty driver; not tested yet (due to a NULL deref earlier
in the MI code), but mostly fine

File:

• trunk/hal/x86_64/drivers/soclib_tty.c (modified) (2 diffs)

trunk/hal/x86_64/drivers/soclib_tty.c

@@ -29 +29 @@
 #include <hal_special.h>
 
+#include <hal_internal.h> // XXX
+
 void soclib_tty_init( chdev_t * chdev )
 {
-
+        // nothing to do
 }
 
+// Pour le write: tout en sync, ça part direct sur le VGA/série
+// Pour le read: là on attend l'ISR
 void __attribute__ ((noinline)) soclib_tty_cmd( xptr_t th_xp )
 {
-        // Pour le write: tout en sync, ça part direct sur le VGA/série
-        // Pour le read: là on attend l'ISR
+        // get client thread cluster and local pointer
+        cxy_t      th_cxy = GET_CXY( th_xp );
+        thread_t * th_ptr = (thread_t *)GET_PTR( th_xp );
+
+        // get command type and extended pointer on TXT device
+        uint32_t type   =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.txt.type ) );
+        xptr_t   dev_xp = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->command.txt.dev_xp ) );
+
+        // get TXT device cluster and local pointer
+        cxy_t     dev_cxy = GET_CXY( dev_xp );
+        chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
+
+        // get extended pointer on SOCLIB_TTY base segment
+        xptr_t tty_xp = (xptr_t)hal_remote_lwd( XPTR( dev_cxy , &dev_ptr->base ) );
+
+        // get SOCLIB_TTY base segment cluster and local pointer
+        cxy_t      tty_cxy = GET_CXY( tty_xp );
+        uint32_t * tty_ptr = (uint32_t *)GET_PTR( tty_xp );
+
+        // get TTY channel index
+        uint32_t   channel = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->channel ) );
+
+        // for now, only channel zero
+        if (channel != 0) {
+                x86_panic("should have been channel zero");
+        }
+
+        if (type == TXT_READ)              // descheduling strategy for calling thread
+        {
+                x86_panic("TXT_READ not handled");
+        }
+        else if (type == TXT_WRITE || type == TXT_SYNC_WRITE) // busy waiting strategy for calling thread
+        {
+                uint32_t   i;
+
+                // get source buffer extended pointer & bytes count
+                uint32_t count  = hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.txt.count ) );
+                xptr_t   buf_xp = hal_remote_lwd( XPTR( th_cxy , &th_ptr->command.txt.buf_xp ) );
+
+                // loop on characters
+                for (i = 0; i < count; i++)
+                {
+                        // get one byte from command buffer in client cluster
+                        char byte = (char)hal_remote_lb( buf_xp + i );
+
+                        // VGA output (for now)
+                        x86_putc(byte);
+                }
+        }
 }
 
@@ -44 +95 @@
         // Cette ISR est juste utile pour le clavier; on arrive ici quand une touche
         // est pressée
+        x86_panic("soclib_tty_isr not handled");
 }