bsps: Move start files to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

bsps/bfin/shared/start/start.S

@@ -0,0 +1,95 @@
+
+#include <rtems/bfin/bfin.h>
+
+#include <bsp.h>
+#include <bspopts.h>
+
+#ifndef LO
+#define LO(con32) ((con32) & 0xFFFF)
+#endif
+#ifndef HI
+#define HI(con32) (((con32) >> 16) & 0xFFFF)
+#endif
+
+#if (BFIN_ON_SKYEYE)
+    .section .init
+#else
+    .section .l1code
+#endif
+    .align  4
+
+    .global __start
+__start:
+
+    /* Start by setting up a stack */
+    sp.h = 0xFFB0;
+    sp.l = 0x0F00;
+
+    /* Maybe we should zero the memory in the .bss section.  */
+
+    /* This changes to the supervisor mode */
+    p0.l = START;
+    p0.h = START;
+    p1.l = LO(EVT15);
+    p1.h = HI(EVT15);
+
+    [P1] = P0;
+
+    P0.h = HI(IMASK);
+    P0.l = LO(IMASK);
+    R0 = [P0];
+    /* R1.l = EVT_IVG15 & 0xFFFF; */
+    R1.l = 0x8000;
+
+    R0 = R0 | R1;
+
+    [P0] = R0;
+
+    RAISE 15;
+
+    P0.l = WAIT;
+    P0.h = WAIT;
+
+    RETI = P0;
+    RTI;
+
+    /* endless loop to wait */
+    WAIT:
+    jump WAIT;
+
+    START:
+    [--SP] = RETI;
+
+    p0.h = _bss_start;
+    p0.l = _bss_start;
+    p1.h = _end;
+    p1.l = _end;
+    r0 = p0;
+    r1 = p1;
+    r1 = r1 - r0;
+    p1 = r1;
+    r0 = 0;
+
+    /* Set _bss_start until _end to zero */
+    lsetup(loop1,loop2) LC0 = p1;
+    loop1:     b[p0] = r0;
+    loop2:  p0 +=1;
+
+    /* call boot_card( 0, 0 ) */
+    r0 = 0;
+    r1 = 0;
+    p0.l = _boot_card;
+    p0.h = _boot_card;
+
+    call (p0);
+
+    HLT
+    p0.l = _exit;
+    p0.h = _exit;
+    P3 = P4;
+    jump    (p0)        /* Should not return.  */
+
+.global _bfin_null_isr
+_bfin_null_isr:
+    rti;
+