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      1 /*	$NetBSD: kloader_machdep.c,v 1.5 2008/04/28 20:23:16 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001, 2002, 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: kloader_machdep.c,v 1.5 2008/04/28 20:23:16 martin Exp $");
     31 
     32 #include "debug_kloader.h"
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 
     37 #include <sh3/mmu.h>
     38 #include <sh3/mmu_sh4.h>
     39 #include <sh3/cache.h>
     40 #include <sh3/cache_sh4.h>
     41 
     42 #include <machine/kloader.h>
     43 
     44 kloader_jumpfunc_t kloader_dreamcast_jump;
     45 kloader_bootfunc_t kloader_dreamcast_boot;
     46 
     47 struct kloader_ops kloader_dreamcast_ops = {
     48 	.jump = kloader_dreamcast_jump,
     49 	.boot = kloader_dreamcast_boot,
     50 };
     51 
     52 void
     53 kloader_reboot_setup(const char *filename)
     54 {
     55 
     56 	__kloader_reboot_setup(&kloader_dreamcast_ops, filename);
     57 }
     58 
     59 void
     60 kloader_dreamcast_jump(kloader_bootfunc_t func, vaddr_t sp,
     61     struct kloader_bootinfo *info, struct kloader_page_tag *tag)
     62 {
     63 
     64 	sh_icache_sync_all();	/* also flush d-cache */
     65 
     66 	__asm volatile(
     67 	    	"mov	%0, r4;"
     68 		"mov	%1, r5;"
     69 		"jmp	@%2;"
     70 		"mov	%3, sp"
     71 		: : "r"(info), "r"(tag), "r"(func), "r"(sp));
     72 	/* NOTREACHED */
     73 }
     74 
     75 /*
     76  * 2nd-bootloader. Make sure that PIC and its size is lower than page size.
     77  */
     78 void
     79 kloader_dreamcast_boot(struct kloader_bootinfo *kbi, struct kloader_page_tag *p)
     80 {
     81 	int tmp = 0;
     82 
     83 	/* Disable interrupt. block exception. */
     84 	__asm volatile(
     85 		"stc	sr, %1;"
     86 		"or	%0, %1;"
     87 		"ldc	%1, sr" : : "r"(0x500000f0), "r"(tmp));
     88 
     89 	/* Now I run on P1, TLB flush. and disable. */
     90 	SH4_TLB_DISABLE;
     91 
     92 	do {
     93 		uint32_t *dst =(uint32_t *)p->dst;
     94 		uint32_t *src =(uint32_t *)p->src;
     95 		uint32_t sz = p->sz / sizeof (int);
     96 		while (sz--)
     97 			*dst++ = *src++;
     98 	} while ((p = (struct kloader_page_tag *)p->next) != 0);
     99 
    100 	SH7750_CACHE_FLUSH();
    101 
    102 	/* jump to kernel entry. */
    103 	__asm volatile(
    104 		"jmp	@%0;"
    105 		"nop;"
    106 		: : "r"(kbi->entry));
    107 	/* NOTREACHED */
    108 }
    109