1 files changed, 124 insertions, 0 deletions

diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S
new file mode 100644
index 000000000000..d67d7ed09f22
--- /dev/null
+++ b/arch/sh/kernel/head_32.S
@@ -0,0 +1,124 @@
+/* $Id: head.S,v 1.7 2003/09/01 17:58:19 lethal Exp $
+ *
+ *  arch/sh/kernel/head.S
+ *
+ *  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Head.S contains the SH exception handlers and startup code.
+ */
+#include <linux/linkage.h>
+#include <asm/thread_info.h>
+
+#ifdef CONFIG_CPU_SH4A
+#define SYNCO()         synco
+
+#define PREFI(label, reg)       \
+        mov.l   label, reg;     \
+        prefi   @reg
+#else
+#define SYNCO()
+#define PREFI(label, reg)
+#endif
+
+        .section        .empty_zero_page, "aw"
+ENTRY(empty_zero_page)
+        .long   1               /* MOUNT_ROOT_RDONLY */
+        .long   0               /* RAMDISK_FLAGS */
+        .long   0x0200          /* ORIG_ROOT_DEV */
+        .long   1               /* LOADER_TYPE */
+        .long   0x00360000      /* INITRD_START */
+        .long   0x000a0000      /* INITRD_SIZE */
+#ifdef CONFIG_32BIT
+        .long   0x53453f00 + 32 /* "SE?" = 32 bit */
+#else
+        .long   0x53453f00 + 29 /* "SE?" = 29 bit */
+#endif
+1:
+        .skip   PAGE_SIZE - empty_zero_page - 1b
+
+        .section        .text.head, "ax"
+
+/*
+ * Condition at the entry of _stext:
+ *
+ *   BSC has already been initialized.
+ *   INTC may or may not be initialized.
+ *   VBR may or may not be initialized.
+ *   MMU may or may not be initialized.
+ *   Cache may or may not be initialized.
+ *   Hardware (including on-chip modules) may or may not be initialized. 
+ *
+ */
+ENTRY(_stext)
+        !                       Initialize Status Register
+        mov.l   1f, r0          ! MD=1, RB=0, BL=0, IMASK=0xF
+        ldc     r0, sr
+        !                       Initialize global interrupt mask
+#ifdef CONFIG_CPU_HAS_SR_RB
+        mov     #0, r0
+        ldc     r0, r6_bank
+#endif
+        
+        /*
+         * Prefetch if possible to reduce cache miss penalty.
+         *
+         * We do this early on for SH-4A as a micro-optimization,
+         * as later on we will have speculative execution enabled
+         * and this will become less of an issue.
+         */
+        PREFI(5f, r0)
+        PREFI(6f, r0)
+
+        !
+        mov.l   2f, r0
+        mov     r0, r15         ! Set initial r15 (stack pointer)
+#ifdef CONFIG_CPU_HAS_SR_RB
+        mov.l   7f, r0
+        ldc     r0, r7_bank     ! ... and initial thread_info
+#endif
+        
+        !                       Clear BSS area
+#ifdef CONFIG_SMP       
+        mov.l   3f, r0
+        cmp/eq  #0, r0          ! skip clear if set to zero
+        bt      10f
+#endif
+        
+        mov.l   3f, r1
+        add     #4, r1
+        mov.l   4f, r2
+        mov     #0, r0
+9:      cmp/hs  r2, r1
+        bf/s    9b              ! while (r1 < r2)
+         mov.l  r0,@-r2
+
+10:             
+        !                       Additional CPU initialization
+        mov.l   6f, r0
+        jsr     @r0
+         nop
+
+        SYNCO()                 ! Wait for pending instructions..
+        
+        !                       Start kernel
+        mov.l   5f, r0
+        jmp     @r0
+         nop
+
+        .balign 4
+#if defined(CONFIG_CPU_SH2)
+1:      .long   0x000000F0              ! IMASK=0xF
+#else
+1:      .long   0x400080F0              ! MD=1, RB=0, BL=0, FD=1, IMASK=0xF
+#endif
+ENTRY(stack_start)
+2:      .long   init_thread_union+THREAD_SIZE
+3:      .long   __bss_start
+4:      .long   _end
+5:      .long   start_kernel
+6:      .long   sh_cpu_init
+7:      .long   init_thread_union