sys_proc_elevate

Added sys_proc_elevate to allow for a user mode program to go to supervisor mode.

src/include/syscalls.h

@@ -87,6 +87,7 @@
 #define KFN_RUN                 0x40    /* Load an execute a binary file */
 #define KFN_MEM_GET_RAMTOP      0x41    /* Get the upper limit of the top of system RAM */
 #define KFN_MEM_RESERVE         0x42    /* Reserve a block of memory at the top of system RAM */
+#define KFN_ELEVATE             0x43    /* Switch the user process to a full privilege */
 
 /* Misc calls */
 

src/m68040/startup_m68040.s

@@ -371,6 +371,9 @@ _syscall:
 ; TRAP#15 handler... transfer control to the C dispatcher
 ;
 h_trap_15:
+            cmp.w #$43,d1               ; Is this a sys_proc_elevate call?
+            beq h_trap_elev             ; Yes, just handle it here
+
             move.l d6,-(sp)             ; Push the parameters to the stack for the C call
             move.l d5,-(sp)
             move.l d4,-(sp)
@@ -386,6 +389,9 @@ h_trap_15:
 
             rte                         ; Return to the caller
 
+h_trap_elev ori #$2000,(a7)             ; Change the caller's privilege to supervisor
+            rte                         ; And return to it
+
 ;
 ; Jump into a user mode code
 ;

src/version.h

@@ -6,7 +6,7 @@
 #define __VERSION_H
 
 #define VER_MAJOR 0
-#define VER_MINOR 51
-#define VER_BUILD 7
+#define VER_MINOR 52
+#define VER_BUILD 1
 
 #endif