u-boot调用wince关键代码

最新推荐文章于 2022-07-27 10:37:33 发布

原创最新推荐文章于 2022-07-27 10:37:33 发布 · 712 阅读

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本文介绍了一个从U-Boot环境启动Windows CE (WinCE) 的过程。通过一个函数`call_wince`，文章详细展示了如何设置并调用WinCE内核地址，包括直接跳转到指定地址前的准备步骤，如缓存清理和MMU禁用等。

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Cpu.c (z:\item_XXXX210\u-boot_XXXX210_1.3.4_ce\cpu\s5pv210)

extern void launch_CE(unsigned int);


void  call_wince(unsigned int a0)
{
	void	(*theKernel)(void);
	theKernel = (void (*)(void))a0;
	printf("wince launch=0x%x\n", a0);
//	cleanup_before_linux();


#if 0
printf("---1----0x%08X\n", theKernel);
__asm__(
	"mov	ip, #0\n"
	"mcr	p15, 0, ip, c13, c0, 0\n"	/* zero PID */
	"mcr	p15, 0, ip, c7, c7, 0\n"	/* invalidate I,D caches */
	"mcr	p15, 0, ip, c7, c10, 4\n"	/* drain write buffer */
	"mcr	p15, 0, ip, c8, c7, 0\n"	/* invalidate I,D TLBs */
	"mrc	p15, 0, ip, c1, c0, 0\n"	/* get control register */
	"bic	ip, ip, #0x0001\n"		/* disable MMU */
	"mcr	p15, 0, ip, c1, c0, 0\n"	/* write control register */
	"nop\n"
	"nop\n"
	);
	theKernel ();
#elif 0
printf("---2----\n");
	launch_CE(a0);
#elif 1
printf("---3----\n");
__asm__(
	"mov	r0, %0\n"
//	"mov	r1, %1\n"
//	"mov	r2, %2\n"
#if 1
	"mov	ip, #0\n"
	"mcr	p15, 0, ip, c13, c0, 0\n"	/* zero PID */
	"mcr	p15, 0, ip, c7, c7, 0\n"	/* invalidate I,D caches */
	"mcr	p15, 0, ip, c7, c10, 4\n"	/* drain write buffer */
	"mcr	p15, 0, ip, c8, c7, 0\n"	/* invalidate I,D TLBs */
	"mrc	p15, 0, ip, c1, c0, 0\n"	/* get control register */
	"bic	ip, ip, #0x0001\n"		/* disable MMU */
	"mcr	p15, 0, ip, c1, c0, 0\n"	/* write control register */
#endif
	"mov	pc, r0\n"
	"nop\n"
	"nop\n"
	: /* no outpus */
	: "r" (a0)
	: "r0","ip"
	);
#endif
}