runnandprog.c

arm9.rar

#define LINUX_PAGE_SHIFT	12
#define LINUX_PAGE_SIZE		(1<<LINUX_PAGE_SHIFT)
#define COMMAND_LINE_SIZE 	1024

struct param_struct {
    union {
	struct {
	    unsigned long page_size;			/*  0 */
	    unsigned long nr_pages;				/*  4 */
	    unsigned long ramdisk_size;			/*  8 */
	    unsigned long flags;				/* 12 */
#define FLAG_READONLY	1
#define FLAG_RDLOAD		4
#define FLAG_RDPROMPT	8
	    unsigned long rootdev;				/* 16 */
	    unsigned long video_num_cols;		/* 20 */
	    unsigned long video_num_rows;		/* 24 */
	    unsigned long video_x;				/* 28 */
	    unsigned long video_y;				/* 32 */
	    unsigned long memc_control_reg;		/* 36 */
	    unsigned char sounddefault;			/* 40 */
	    unsigned char adfsdrives;			/* 41 */
	    unsigned char bytes_per_char_h;		/* 42 */
	    unsigned char bytes_per_char_v;		/* 43 */
	    unsigned long pages_in_bank[4];		/* 44 */
	    unsigned long pages_in_vram;		/* 60 */
	    unsigned long initrd_start;			/* 64 */
	    unsigned long initrd_size;			/* 68 */
	    unsigned long rd_start;				/* 72 */
	    unsigned long system_rev;			/* 76 */
	    unsigned long system_serial_low;	/* 80 */
	    unsigned long system_serial_high;	/* 84 */
	    unsigned long mem_fclk_21285;       /* 88 */
	} s;
	char unused[256];
    } u1;
    union {
	char paths[8][128];
	struct {
	    unsigned long magic;
	    char n[1024 - sizeof(unsigned long)];
	} s;
    } u2;
    char commandline[COMMAND_LINE_SIZE];
};

/*************************************************************/
static __inline void cpu_arm920_cache_clean_invalidate_all(void)
{
	__asm{
		mov	r1, #0		
		mov	r1, #7 << 5			  	/* 8 segments */
cache_clean_loop1:		
		orr	r3, r1, #63UL << 26	  	/* 64 entries */
cache_clean_loop2:	
		mcr	p15, 0, r3, c7, c14, 2	/* clean & invalidate D index */
		subs	r3, r3, #1 << 26
		bcs	cache_clean_loop2		/* entries 64 to 0 */
		subs	r1, r1, #1 << 5
		bcs	cache_clean_loop1		/* segments 7 to 0 */
		mcr	p15, 0, r1, c7, c5, 0	/* invalidate I cache */
		mcr	p15, 0, r1, c7, c10, 4	/* drain WB */
	}
}
void cache_clean_invalidate(void)
{
	cpu_arm920_cache_clean_invalidate_all();
}

static __inline void cpu_arm920_tlb_invalidate_all(void)
{
	__asm{
		mov	r0, #0
		mcr	p15, 0, r0, c7, c10, 4	/* drain WB */
		mcr	p15, 0, r0, c8, c7, 0	/* invalidate I & D TLBs */
	}
}

void tlb_invalidate(void)
{
	cpu_arm920_tlb_invalidate_all();
}

void call_linux(U32 a0, U32 a1, U32 a2)
{
	void (*goto_start)(U32, U32);
	cache_clean_invalidate();
	tlb_invalidate();	

	__asm{
//		mov	r0, a0//%0
//		mov	r1, a1//%1
//		mov	r2, a2//%2
		mov	ip, #0
		mcr	p15, 0, ip, c13, c0, 0	/* zero PID */
		mcr	p15, 0, ip, c7, c7, 0	/* invalidate I,D caches */
		mcr	p15, 0, ip, c7, c10, 4	/* drain write buffer */
		mcr	p15, 0, ip, c8, c7, 0	/* invalidate I,D TLBs */
		mrc	p15, 0, ip, c1, c0, 0	/* get control register */
		bic	ip, ip, #0x0001			/* disable MMU */
		mcr	p15, 0, ip, c1, c0, 0	/* write control register */
		//mov	pc, r2
		//nop
		//nop
		/* no outpus */
		//: "r" (a0), "r" (a1), "r" (a2)
	}
	SetClockDivider(1, 1);
	SetSysFclk(FCLK_200M);		//start kernel, use 200M
	Delay(1000);
//	disable_irq();
	goto_start = (void (*)(U32, U32))a2;
	(*goto_start)(a0, a1);	
}

static void LoadRun(void)
{
	U32 i, ram_addr, buf = 0x30400000;
	struct param_struct *params = (struct param_struct *)0x30000100;
	int size;
	char *linux_params = "root=/dev/mtdblock2 load_ramdisk=0 init=/linuxrc console=ttyS0 mem=64M devfs=mount";
	
	StartPage = NandPart[1].offset>>9;
	size = NandPart[1].size;
	ram_addr = buf;	
	
	for(i=0; size>0; ) {
		if(!(i&0x1f)) {
			if(CheckBadBlk(i+StartPage)) {
				printf("Skipped bad block at 0x%x\n", i+StartPage);
				i += 32;
				size -= 32<<9;
				continue;
			}
		}
		ReadPage((i+StartPage), (U8 *)ram_addr);
		i++;
		size -= 512;
		ram_addr += 512;
	}
	DsNandFlash();

	for(i=0; i<(sizeof(struct param_struct)>>2); i++)
		((U32 *)params)[i] = 0;
	params->u1.s.page_size = LINUX_PAGE_SIZE;
	params->u1.s.nr_pages = (0x04000000 >> LINUX_PAGE_SHIFT);
	for(i=0; linux_params[i]; i++)
		params->commandline[i] = linux_params[i];
	
	puts("Set boot params = ");
	puts(linux_params);
	putch('\n');
	call_linux(0, 193, buf);
}