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-rw-r--r--arch/m68k/platform/68328/head-rom.S110
1 files changed, 110 insertions, 0 deletions
diff --git a/arch/m68k/platform/68328/head-rom.S b/arch/m68k/platform/68328/head-rom.S
new file mode 100644
index 0000000..6ec77d3
--- /dev/null
+++ b/arch/m68k/platform/68328/head-rom.S
@@ -0,0 +1,110 @@
+
+ .global _start
+ .global _stext
+
+ .global _rambase
+ .global _ramvec
+ .global _ramstart
+ .global _ramend
+
+#ifdef CONFIG_INIT_LCD
+ .global splash_bits
+#endif
+
+ .data
+
+/*
+ * Set up the usable of RAM stuff. Size of RAM is determined then
+ * an initial stack set up at the end.
+ */
+.align 4
+_ramvec:
+.long 0
+_rambase:
+.long 0
+_ramstart:
+.long 0
+_ramend:
+.long 0
+
+#define RAMEND (CONFIG_RAMBASE + CONFIG_RAMSIZE)
+
+#ifdef CONFIG_INIT_LCD
+splash_bits:
+#include "bootlogo.rh"
+#endif
+
+ .text
+_start:
+_stext: movew #0x2700,%sr
+#ifdef CONFIG_INIT_LCD
+ movel #splash_bits, 0xfffffA00 /* LSSA */
+ moveb #0x28, 0xfffffA05 /* LVPW */
+ movew #0x280, 0xFFFFFa08 /* LXMAX */
+ movew #0x1df, 0xFFFFFa0a /* LYMAX */
+ moveb #0, 0xfffffa29 /* LBAR */
+ moveb #0, 0xfffffa25 /* LPXCD */
+ moveb #0x08, 0xFFFFFa20 /* LPICF */
+ moveb #0x01, 0xFFFFFA21 /* -ve pol */
+ moveb #0x81, 0xfffffA27 /* LCKCON */
+ movew #0xff00, 0xfffff412 /* LCD pins */
+#endif
+ moveal #RAMEND-CONFIG_MEMORY_RESERVE*0x100000 - 0x10, %sp
+ movew #32767, %d0 /* PLL settle wait loop */
+1: subq #1, %d0
+ bne 1b
+
+ /* Copy data segment from ROM to RAM */
+ moveal #_etext, %a0
+ moveal #_sdata, %a1
+ moveal #_edata, %a2
+
+ /* Copy %a0 to %a1 until %a1 == %a2 */
+1: movel %a0@+, %a1@+
+ cmpal %a1, %a2
+ bhi 1b
+
+ moveal #_sbss, %a0
+ moveal #_ebss, %a1
+ /* Copy 0 to %a0 until %a0 == %a1 */
+
+1:
+ clrl %a0@+
+ cmpal %a0, %a1
+ bhi 1b
+
+ movel #_sdata, %d0
+ movel %d0, _rambase
+ movel #_ebss, %d0
+ movel %d0, _ramstart
+ movel #RAMEND-CONFIG_MEMORY_RESERVE*0x100000, %d0
+ movel %d0, _ramend
+ movel #CONFIG_VECTORBASE, %d0
+ movel %d0, _ramvec
+
+/*
+ * load the current task pointer and stack
+ */
+ lea init_thread_union, %a0
+ lea 0x2000(%a0), %sp
+
+1: jsr start_kernel
+ bra 1b
+_exit:
+
+ jmp _exit
+
+
+putc:
+ moveb %d7,0xfffff907
+1:
+ movew 0xfffff906, %d7
+ andw #0x2000, %d7
+ beq 1b
+ rts
+
+ .data
+env:
+ .long 0
+ .text
+
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