This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / arm26 / kernel / head.S

diff --git a/arch/arm26/kernel/head.S b/arch/arm26/kernel/head.S
new file mode 100644 (file)
index 0000000..8bfc625
--- /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