大佬們！！！ 求程式的流程圖！！！！！
#include "def.h"
#include "nand.h"
#include "244x_lib.h"
#include "s3c2440.h"
#include "parameters.h"
static inline void MMU_EnableICache(void)
{
asm (
"mrc p15,0,r0,c1,c0,0\n"
"orr r0,r0,#(1<<12)\n"
"mcr p15,0,r0,c1,c0,0\n"
);
}
static inline void MMU_EnableDCache(void)
{
asm (
"mrc p15,0,r0,c1,c0,0\n"
"orr r0,r0,#(1<<2)\n"
"mcr p15,0,r0,c1,c0,0\n"
);
}
static void CallLinux(void)
{
struct param_struct {
union {
struct {
unsigned long page_size; /* 0 */
unsigned long nr_pages; /* 4 */
unsigned long ramdisk_size; /* 8 */
unsigned long flags; /* 12 */
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[1024];
};
struct param_struct *p = (struct param_struct *)0x30000100;
memset(p, 0, sizeof(*p));
memcpy(p->commandline, g_linux_cmd_line, sizeof(g_linux_cmd_line));
p->u1.s.page_size = 4 * 1024;
p->u1.s.nr_pages = 64 * 1024 * 1024 / (4 * 1024);
{
unsigned int *pp = (unsigned int *)(0x30008024);
if (pp[0] == 0x016f2818) { // Magic number of zImage
//Uart_SendString("\n\rOk\n\r");
} else {
Uart_SendString("\n\rWrong Linux Kernel\n\r");
for (;;) ;
}
}
asm (
"mov r5, %2\n"
"mov r0, %0\n"
"mov r1, %1\n"
"mov ip, #0\n"
"mov pc, r5\n"
"nop\n" "nop\n": /* no outpus */
:"r"(0), "r"(1999), "r"(g_os_ram_start)
);
}
void ReadImageFromNand(void)
{
unsigned int Length;
U8 *RAM;
unsigned BlockNum;
unsigned pos;
Length = g_os_length;
Length = (Length + BLOCK_SIZE - 1) >> (BYTE_SECTOR_SHIFT + SECTOR_BLOCK_SHIFT) << (BYTE_SECTOR_SHIFT + SECTOR_BLOCK_SHIFT); // align to Block Size
BlockNum = g_os_start >> (BYTE_SECTOR_SHIFT + SECTOR_BLOCK_SHIFT);
RAM = (U8 *) g_os_ram_start;
for (pos = 0; pos < Length; pos += BLOCK_SIZE) {
unsigned int i;
// skip badblock
for (;;) {
if (NandIsGoodBlock
(BlockNum <<
(BYTE_SECTOR_SHIFT + SECTOR_BLOCK_SHIFT))) {
break;
}
BlockNum++; //try next
}
for (i = 0; i < BLOCK_SIZE; i += SECTOR_SIZE) {
int ret =
NandReadOneSector(RAM,
(BlockNum <<
(BYTE_SECTOR_SHIFT +
SECTOR_BLOCK_SHIFT)) + i);
RAM += SECTOR_SIZE;
ret = 0;
}
BlockNum++;
}
CallLinux();
}
static inline void GetParameters(void)
{
U32 Buf[2048];
g_os_type = OS_LINUX;
g_os_start = 0x60000;
g_os_length = 0x500000;
g_os_ram_start = 0x30008000;
// vivi LINUX CMD LINE
NandReadOneSector((U8 *)Buf, 0x48000);
if (Buf[0] == 0x49564956 && Buf[1] == 0x4C444D43) {
memcpy(g_linux_cmd_line, (char *)&(Buf[2]), sizeof g_linux_cmd_line);
}
}
void Main(void)
{
MMU_EnableICache();
MMU_EnableDCache();
Port_Init();
NandInit();
if (g_page_type == PAGE_UNKNOWN) {
Uart_SendString("\r\nunsupport NAND\r\n");
for(;;);
}
GetParameters();
Uart_SendString("load Image of Linux...\n\r");
ReadImageFromNand();
}
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