diff options
Diffstat (limited to 'nuttx/arch/z80/src/z8/z8_head.S')
| -rwxr-xr-x | nuttx/arch/z80/src/z8/z8_head.S | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/nuttx/arch/z80/src/z8/z8_head.S b/nuttx/arch/z80/src/z8/z8_head.S new file mode 100755 index 000000000..0e3153a8e --- /dev/null +++ b/nuttx/arch/z80/src/z8/z8_head.S @@ -0,0 +1,252 @@ +/**************************************************************************
+ * arch/z80/src/z8/z8_head.S
+ * ez8 Reset Entry Point
+ *
+ * Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS or IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER or CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, or CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS or SERVICES; LOSS
+ * OF USE, DATA, or PROFITS; or BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, or TORT (INCLUDING NEGLIGENCE or OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ **************************************************************************/
+
+/**************************************************************************
+ * Included Files
+ **************************************************************************/
+
+#include <nuttx/config.h>
+#include <ez8.inc>
+#include <configl.inc>
+
+/**************************************************************************
+ * Definitions
+ **************************************************************************/
+
+/* Assuem the large model */
+
+#if !defined(CONFIG_Z8_MODEL_LARGE) && !defined(CONFIG_Z8_MODEL_SMALL)
+# define CONFIG_Z8_MODEL_LARGE 1
+# undef CONFIG_Z8_MODEL_SMALL
+#endif
+
+#ifdef __Z8F1680
+# define CONFIG_Z8_COPYPRAM
+#else
+# undef CONFIG_Z8_COPYPRAM
+#endif
+
+
+/**************************************************************************
+ * External References / External Definitions
+ **************************************************************************/
+
+ xref _z16f_clkinit:ROM
+ xref _z16f_lowinit:ROM
+#ifdef CONFIG_ARCH_LEDS
+ xref _up_ledinit:ROM
+#endif
+#if defined(CONFIG_USE_LOWUARTINIT)
+ xref _z16f_lowuartinit:ROM
+#elif defined(CONFIG_USE_EARLYSERIALINIT)
+ xref _up_earlyserialinit:ROM
+#endif
+ xref _os_start:ROM
+ xref _up_doirq:ROM
+ xref _low_nearbss
+ xref _len_nearbss
+ xref _low_farbss
+ xref _len_farbss
+ xref _low_neardata
+ xref _len_neardata
+ xref _low_near_romdata
+ xref _low_fardata
+ xref _len_fardata
+ xref _low_far_romdata
+#ifdef CONFIG_Z8_COPYPRAM
+ xref _low_pramseg
+ xref _len_pramseg
+ xref _low_pram_romdata
+#endif
+ xref _far_stack
+ xref _near_stack
+ xdef _z8_reset
+ xdef __intrp
+
+/**************************************************************************
+ * Code
+ **************************************************************************/
+
+ /* Vector table space allocation */
+
+ include "vect.inc"
+
+ /* Reset vector */
+
+ vector reset=_z8_reset
+
+/**************************************************************************
+ * Name: _z16f_reset
+ *
+ * Description:
+ * Reset entry point
+ *
+ **************************************************************************/
+
+ define startup, space=rom
+ segment startup
+_z8_reset:
+ /* Set the register pointer for working registers e0-ef */
+
+ srp #%e0
+
+ /* Initialize the stack pointer */
+
+ ldx spl, #low(_far_stack+1)
+ ldx sph, #high(_far_stack+1)
+
+ /* Clear internal register ram area (c_nearbss) */
+
+ ld r0, #_low_nearbss
+ ld r2, #_len_nearbss
+ cp r2, #0
+ jr z, _z8_reset2
+
+_z8_reset1:
+ clr @r0
+ inc r0
+ djnz r2, _z8_reset1
+
+ /* Clear extended ram area (c_farbss) */
+
+_z8_reset2:
+ ld r2, #high(_low_farbss)
+ ld r3, #low(_low_farbss)
+ ld r0, #high(_len_farbss)
+ ld r1, #low(_len_farbss)
+
+ ld r4, r0
+ or r4, r1
+ jr z, _z8_reset4
+ clr r4
+
+_z8_reset3:
+ ldx @rr2,r4
+ incw rr2
+ decw rr0
+ jr nz, _z8_reset3
+
+ /* Copy ROM data into internal RAM */
+
+_z8_reset4:
+ ld r0, #high(_low_near_romdata)
+ ld r1, #low(_low_near_romdata)
+ ld r3, #_len_neardata
+ ld r4, #_low_neardata
+ or r3, r3
+
+_z8_reset5:
+ ldci @r4, @rr0
+ djnz r3, _z8_reset5
+
+ /* Copy ROM data into extended RAM */
+
+ ld r0, #high(_low_fardata)
+ ld r1, #low(_low_fardata)
+ ld r2, #high(_low_far_romdata)
+ ld r3, #low(_low_far_romdata)
+ ld r4, #high(_len_fardata)
+ ld r5, #low(_len_fardata)
+
+ ld r6, r4
+ or r6, r5
+ jr z, _z8_reset7
+
+_z8_reset6:
+ ldc r6, @rr2
+ ldx @rr0, r6
+ incw rr0
+ incw rr2
+ decw rr4
+ jr nz, _z8_reset6
+
+ /* Copy ROM copy of code into Program RAM */
+
+_z8_reset7:
+#ifdef CONFIG_Z8_COPYPRAM
+ ld r0, #high(_low_pramseg)
+ ld r1, #low(_low_pramseg)
+ ld r2, #high(_low_pram_romdata)
+ ld r3, #low(_low_pram_romdata)
+ ld r4, #high(_len_pramseg)
+ ld r5, #low(_len_pramseg)
+
+ ld r6, r4
+ or r6, r5
+ jr z, _z8_reset9
+
+_z8_reset8:
+ ldc r6, @rr2
+ ldc @rr0, r6
+ incw rr0
+ incw rr2
+ decw rr4
+ jr nz, _z8_reset8
+
+_z8_reset9:
+#endif
+
+ /* Start NuttX */
+
+ ldx __intrp,#0
+ xor r15, r15
+ xor r14, r14
+ call _os_start
+
+ /* We should never get here */
+
+_z8_reset_halt:
+ jr _z8_reset_halt
+
+/**************************************************************************
+ * Code
+ **************************************************************************/
+
+#ifdef CONFIG_Z8_MODEL_LARGE
+ segment FAR_BSS
+__intrp ds 1
+#else
+ segment NEAR_BSS
+__intrp ds 1
+#endif
+
+ /* Set aside area for working registers */
+
+ define workingreg, space=rdata, org=%E0
+ segment workingreg
+ ds %10
+
+ end _z8_reset
|