1 files changed, 113 insertions, 0 deletions
diff --git a/arch/arm26/kernel/head.S b/arch/arm26/kernel/head.S
new file mode 100644
index 000000000000..8bfc62539ba6
--- /dev/null
+++ b/arch/arm26/kernel/head.S
@@ -0,0 +1,113 @@
+/*
+ *  linux/arch/arm26/kernel/head.S
+ *
+ *  Copyright (C) 1994-2000 Russell King
+ *  Copyright (C) 2003 Ian Molton
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  26-bit kernel startup code
+ */
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <asm/mach-types.h>
+
+		.globl	swapper_pg_dir
+		.equ	swapper_pg_dir,	0x0207d000
+
+/*
+ * Entry point.
+ */
+		.section ".init.text",#alloc,#execinstr
+ENTRY(stext)
+
+__entry:
+		cmp	pc, #0x02000000
+		ldrlt	pc, LC0			@ if 0x01800000, call at 0x02080000
+		teq	r0, #0                  @ Check for old calling method
+		blne	oldparams		@ Move page if old
+
+		adr	r0, LC0
+		ldmib	r0, {r2-r5, sp}		@ Setup stack (and fetch other values)
+
+		mov	r0, #0			@ Clear BSS
+1:		cmp	r2, r3
+		strcc	r0, [r2], #4
+		bcc	1b
+
+		bl	detect_proc_type
+		str	r0, [r4]
+		bl	detect_arch_type
+		str	r0, [r5]
+
+#ifdef CONFIG_XIP_KERNEL
+               ldr     r3, ETEXT                       @ data section copy
+               ldr     r4, SDATA
+               ldr     r5, EDATA
+1:
+               ldr     r6, [r3], #4
+               str     r6, [r4], #4
+               cmp     r4, r5
+               blt     1b
+#endif
+		mov	fp, #0
+		b	start_kernel
+
+LC0:		.word	_stext
+		.word	__bss_start		@ r2
+		.word	_end			@ r3
+		.word	processor_id		@ r4
+		.word	__machine_arch_type	@ r5
+		.word	init_thread_union+8192	@ sp
+#ifdef CONFIG_XIP_KERNEL
+ETEXT:		.word   _endtext
+SDATA:		.word   _sdata
+EDATA:		.word   __bss_start
+#endif
+
+arm2_id:	.long	0x41560200  @ ARM2 and 250 dont have a CPUID
+arm250_id:	.long	0x41560250  @ So we create some after probing for them
+		.align
+
+oldparams:	mov     r4, #0x02000000
+		add	r3, r4, #0x00080000
+		add	r4, r4, #0x0007c000
+1:		ldmia	r0!, {r5 - r12}
+		stmia	r4!, {r5 - r12}
+		cmp	r4, r3
+		blt	1b
+		mov	pc, lr
+
+/*
+ * We need some way to automatically detect the difference between
+ * these two machines.  Unfortunately, it is not possible to detect
+ * the presence of the SuperIO chip, because that will hang the old
+ * Archimedes machines solid.
+ */
+/* DAG: Outdated, these have been combined !!!!!!! */
+detect_arch_type:
+#if defined(CONFIG_ARCH_ARC)
+		mov	r0, #MACH_TYPE_ARCHIMEDES
+#elif defined(CONFIG_ARCH_A5K)
+		mov	r0, #MACH_TYPE_A5K
+#endif
+		mov	pc, lr
+
+detect_proc_type:
+		mov	ip, lr
+		mov	r2, #0xea000000		@ Point undef instr to continuation
+		adr	r0, continue - 12
+		orr	r0, r2, r0, lsr #2
+		mov	r1, #0
+		str	r0, [r1, #4]
+		ldr	r0, arm2_id
+		swp	r2, r2, [r1]		@ check for swp (ARM2 cant)
+		ldr	r0, arm250_id
+		mrc	15, 0, r3, c0, c0	@ check for CP#15 (ARM250 cant)
+		mov	r0, r3
+continue:	mov	r2, #0xeb000000		@ Make undef vector loop
+		sub	r2, r2, #2
+		str	r2, [r1, #4]
+		mov	pc, ip