/**
* <Ring 1> This routine is called when a device is opened. It reads the
* partition table(s) and fills the hd_info struct.
*
* @param device Device nr.
* @param style P_PRIMARY or P_EXTENDED.
*****************************************************************************/
PRIVATE void partition(int device, int style)
{
int i;
int drive = DRV_OF_DEV(device);
struct hd_info * hdi = &hd_info[drive];
struct part_ent part_tbl[NR_SUB_PER_DRIVE];
if (style == P_PRIMARY) {
get_part_table(drive, drive, part_tbl);
int nr_prim_parts = 0;
for (i = 0; i < NR_PART_PER_DRIVE; i++) { /* 0~3 */
if (part_tbl[i].sys_id == NO_PART)
continue;
nr_prim_parts++;
//dev_nr從1開始，因為0是整個hd, 見P346
int dev_nr = i + 1; /* 1~4 */
hdi->primary[dev_nr].base = part_tbl[i].start_sect;
hdi->primary[dev_nr].size = part_tbl[i].nr_sects;
// 如果是extend的話，還要再往下分析是否有其他logic partition
if (part_tbl[i].sys_id == EXT_PART) /* extended */
partition(device + dev_nr, P_EXTENDED);
}
assert(nr_prim_parts != 0);
}
else if (style == P_EXTENDED) {
int j = device % NR_PRIM_PER_DRIVE; /* 1~4 */
int ext_start_sect = hdi->primary[j].base;
int s = ext_start_sect;
int nr_1st_sub = (j - 1) * NR_SUB_PER_PART; /* 0/16/32/48 */
for (i = 0; i < NR_SUB_PER_PART; i++) {
int dev_nr = nr_1st_sub + i;/* 0~15/16~31/32~47/48~63 */
get_part_table(drive, s, part_tbl);
hdi->logical[dev_nr].base = s + part_tbl[0].start_sect;
hdi->logical[dev_nr].size = part_tbl[0].nr_sects;
s = ext_start_sect + part_tbl[1].start_sect;
/* no more logical partitions
in this extended partition */
if (part_tbl[1].sys_id == NO_PART)
break;
}
}
else {
assert(0);
}
}
/**
* <Ring 1> This routine handles DEV_CLOSE message.
*
* @param device The device to be opened.
*****************************************************************************/
PRIVATE void hd_close(int device)
{
int drive = DRV_OF_DEV(device);
assert(drive == 0); /* only one drive */
hd_info[drive].open_cnt--;
}
/*
* <ring 1> this routine handles DEV_CLOSE message.
*
* @param device - the device to be close.
*/
static void hd_close(int device)
{
int drive = DRV_OF_DEV(device);
assert(drive == 0);
hd_info[drive].open_cnt--;
}
/*
* <ring 1> this routine is called when a device is opened. It reads the
* partition table and fills the hd_info struct.
*
* @param device - device number.
* @param style - P_PRIMARY or P_EXTENDED.
*/
static void partition(int device, int style)
{
int i;
int drive = DRV_OF_DEV(device);
struct hd_info *hdi = &hd_info[drive];
struct part_ent part_tbl[NR_SUB_PER_DRIVE];
if (style == P_PRIMARY)
{
get_part_table(drive, drive, part_tbl);
int nr_prim_parts = 0;
for (i = 0; i< NR_PART_PER_DRIVE; i++)
{
if (part_tbl[i].sys_id == NO_PART)
{
continue;
}
nr_prim_parts++;
int dev_nr = i + 1;
hdi->primary[dev_nr].base = part_tbl[i].start_sect;
hdi->primary[dev_nr].size = part_tbl[i].nr_sects;
if (part_tbl[i].sys_id == EXT_PART)
partition(device + dev_nr, P_EXTENDED);
}
assert(nr_prim_parts != 0);
}
else if (style == P_EXTENDED)
{
int j = device % NR_PRIM_PER_DRIVE;
int ext_start_sect = hdi->primary[j].base;
int s = ext_start_sect;
int nr_1st_sub = (j - 1) * NR_SUB_PER_PART;
for (i = 0; i < NR_SUB_PER_PART; i++)
{
int dev_nr = nr_1st_sub + i;
get_part_table(drive, s, part_tbl);
hdi->logical[dev_nr].base = s + part_tbl[0].start_sect;
hdi->logical[dev_nr].size = part_tbl[0].nr_sects;
s = ext_start_sect + part_tbl[1].start_sect;
if (part_tbl[1].sys_id == NO_PART)
{
break;
}
}
}
else
{
assert(0);
}
}
/**
* <Ring 1> This routine handles DEV_READ and DEV_WRITE message.
*
* @param p Message ptr.
*****************************************************************************/
PRIVATE void hd_rdwt(MESSAGE * p)
{
// p->DEVICE 為 0x20，也就是 hd2a
int pDev = p->DEVICE;
int drive = DRV_OF_DEV(p->DEVICE);
u64 pos = p->POSITION;
assert((pos >> SECTOR_SIZE_SHIFT) < (1 << 31));
/**
* We only allow to R/W from a SECTOR boundary:
*/
assert((pos & 0x1FF) == 0);
u32 sect_nr = (u32)(pos >> SECTOR_SIZE_SHIFT); /* pos / SECTOR_SIZE */
//取出logic index
int logidx = (p->DEVICE - MINOR_hd1a) % NR_SUB_PER_DRIVE;
// 找出某個partition的LBA,
// MAX_PRIM=9，代表Hd0~Hd9為primary的編號，超過9以上的編號都是logic
sect_nr += p->DEVICE < MAX_PRIM ?
hd_info[drive].primary[p->DEVICE].base :
hd_info[drive].logical[logidx].base;
ERIC_HD("\nHDRW=%x", sect_nr);
struct hd_cmd cmd;
cmd.features = 0;
cmd.count = (p->CNT + SECTOR_SIZE - 1) / SECTOR_SIZE;
cmd.lba_low = sect_nr & 0xFF;
cmd.lba_mid = (sect_nr >> 8) & 0xFF;
cmd.lba_high= (sect_nr >> 16) & 0xFF;
cmd.device = MAKE_DEVICE_REG(1, drive, (sect_nr >> 24) & 0xF);
cmd.command = (p->type == DEV_READ) ? ATA_READ : ATA_WRITE;
hd_cmd_out(&cmd);
int bytes_left = p->CNT;
void * la = (void*)va2la(p->PROC_NR, p->BUF);
while (bytes_left) {
//一次只讀512 byte
int bytes = min(SECTOR_SIZE, bytes_left);
if (p->type == DEV_READ) {
interrupt_wait();
port_read(REG_DATA, hdbuf, SECTOR_SIZE);
phys_copy(la, (void*)va2la(TASK_HD, hdbuf), bytes);
}
else {
if (!waitfor(STATUS_DRQ, STATUS_DRQ, HD_TIMEOUT))
panic("hd writing error.");
port_write(REG_DATA, la, bytes);
interrupt_wait();
}
bytes_left -= SECTOR_SIZE;
la += SECTOR_SIZE;
}
}
PUBLIC void kernelHdClose(u32 device)
{
int drive = DRV_OF_DEV(device);
if(drive != 0)
disp_str("drive != 0");
hd_info[drive].open_cnt--;
}
PRIVATE void hd_open(int device)
{
int drive = DRV_OF_DEV(device);
hd_identify(drive);
if (hd_info[drive].open_cnt++ == 0) {
partition(drive * (NR_PART_PER_DRIVE + 1), P_PRIMARY);
print_hdinfo(&hd_info[drive]);
}
}
/*
* <ring 1> this routine handles DEV_READ and DEV_WRITE message.
*
* @param msg - message
*/
static void hd_rdwt(MESSAGE *msg)
{
int drive = DRV_OF_DEV(msg->DEVICE);
u64 pos = msg->POSITION;
assert((pos >> SECTOR_SIZE_SHIFT) < (1 << 31));
assert((pos & 0x1ff) == 0);
u32 sect_nr = (u32)(pos >> SECTOR_SIZE_SHIFT);
int logidx = (msg->DEVICE - MINOR_hd1a) % NR_SUB_PER_DRIVE;
sect_nr += msg->DEVICE < MAX_PRIM ?
hd_info[drive].primary[msg->DEVICE].base :
hd_info[drive].logical[logidx].base;
struct hd_cmd cmd;
cmd.features = 0;
cmd.count = (msg->CNT + SECTOR_SIZE - 1) / SECTOR_SIZE;
cmd.lba_low = sect_nr & 0xff;
cmd.lba_mid = (sect_nr >> 8) & 0xff;
cmd.lba_high = (sect_nr >> 16) & 0xff;
cmd.device = MAKE_DEVICE_REG(1, drive, (sect_nr >> 24) & 0xf);
cmd.command = (msg->type == DEV_READ) ? ATA_READ : ATA_WRITE;
hd_cmd_out(&cmd);
int bytes_left = msg->CNT;
void *la = (void*)va2la(msg->PROC_NR, msg->BUF);
while (bytes_left > 0)
{
int bytes = min(SECTOR_SIZE, bytes_left);
if (msg->type == DEV_READ)
{
interrupt_wait();
port_read(REG_DATA, hdbuf, SECTOR_SIZE);
phys_copy(la, (void*)va2la(TASK_HD, hdbuf), bytes);
}
else
{
if (!waitfor(STATUS_DRQ, STATUS_DRQ, HD_TIMEOUT))
{
panic("hd writing error.");
}
port_write(REG_DATA, la, bytes);
interrupt_wait();
}
bytes_left -= SECTOR_SIZE;
la += SECTOR_SIZE;
}
}
/* identify hard drive and print partition table */
PRIVATE void hd_open(int device) {
int drive = DRV_OF_DEV(device);
assert(drive == 0); /* 系统上只有一个硬盘 */
hd_identify(drive);
if (hd_info[drive].open_cnt++ == 0) {
/* 第一次打开硬盘 */
partition(drive * (NR_PART_PER_DRIVE + 1), P_PRIMARY);
/* print_hdinfo(&hd_info[drive]); */
}
}
PUBLIC void kernelHdIoctl(u32 device, u32 request, char* buf)
{
int drive = DRV_OF_DEV(device);
struct hd_info * hdi = &hd_info[drive];
if(request == DIOCTL_GET_GEO){
memcpy(buf,
device < MAX_PRIM ? &hdi->primary[device] : &hdi->logical[(device - MINOR_hd1a) % NR_SUB_PER_DRIVE],
sizeof(struct part_info));
}
else
disp_str("no such command\n");
}
PRIVATE void hd_ioctl(MESSAGE* p_msg) {
int device = p_msg -> DEVICE;
int drive = DRV_OF_DEV(device);
HD_INFO* hdi = &hd_info[drive];
if (p_msg -> REQUEST == DIOCTL_GET_GEO) {
void* dst = va2la(p_msg -> PROC_NR, p_msg -> BUF);
void* src = va2la(TASK_HD, device < MAX_PRIM ? &hdi->primary[drive] : &hdi->logical[(device - MINOR_hd1a) % NR_SUB_PER_DRIVE]);
memcpy(dst, src, sizeof(PART_ENT));
} else {
spin("HD No IO CTL");
}
}
/*
* @param device Device number
* @param style Primary or extended
*/
PRIVATE void partition(int device, int style) {
int drive = DRV_OF_DEV(device);
HD_INFO *hdi = &hd_info[drive];
PART_ENT part_tbl[NR_SUB_PER_DRIVE];
if (style == P_PRIMARY) {
/* 如果是主分区 */
get_part_table(drive, drive, part_tbl);
int nr_prim_parts = 0;
for (int i=0; i<NR_PART_PER_DRIVE; i++) {
if (part_tbl[i].sys_id == NO_PART) {
continue;
}
nr_prim_parts++;
int dev_nr = i+1;
hdi -> primary[dev_nr].base = part_tbl[i].start_sect;
hdi -> primary[dev_nr].size = part_tbl[i].nr_sects;
if (part_tbl[i].sys_id == EXT_PART) {
partition(device + dev_nr, P_EXTENDED);
}
}
assert(nr_prim_parts);
} else if (style == P_EXTENDED) {
/* 如果是扩展分区 */
int j = device % NR_PRIM_PER_DRIVE; /* drive number */
int ext_start_sect = hdi -> primary[j].base;
int start = ext_start_sect;
int nr_1st_sub = (j-1)*NR_SUB_PER_PART; /* 第一个逻辑分区号 */
for(int i=0; i<NR_SUB_PER_PART; i++) {
int dev_nr = nr_1st_sub + i; /* 逻辑分区次设备号 */
get_part_table(drive, start, part_tbl);
hdi -> logical[dev_nr].base = start + part_tbl[0].start_sect;
hdi -> logical[dev_nr].size = part_tbl[0].nr_sects;
start = ext_start_sect + part_tbl[1].start_sect;
if (part_tbl[1].sys_id == NO_PART)
break;
}
} else {
assert(0);
}
}
/*****************************************************************************
* partition
*****************************************************************************
* <Ring 1> This routine is called when a device is opened. It reads the
* partition table(s) and fills the hd_info struct.
*
* @param device Device nr.
* @param style P_PRIMARY or P_EXTENDED.
*****************************************************************************/
PRIVATE void partition(int device, int style)
{
int i;
int drive = DRV_OF_DEV(device);
struct hd_info* hdi = &hd_info[drive];
struct part_ent part_table[NR_SUB_PER_DRIVE];
if(style == P_PRIMARY){
get_part_table(drive, drive, part_table);
int nr_prim_parts = 0;
for(i = 0; i < NR_PART_PER_DRIVE; i++){
if(part_table[i].sys_id == NO_PART)
continue;
nr_prim_parts++;
int dev_nr = i + 1; /* 1~4*/
hdi->primary[dev_nr].base = part_table[i].start_sect;
hdi->primary[dev_nr].size = part_table[i].nr_sects;
if(part_table[i].sys_id == EXT_PART) /* extended */
partition(device + dev_nr, P_EXTENDED);
}
}
else if(style == P_EXTENDED){
int j = device % NR_PRIM_PER_DRIVE; /* 1~4 */
int ext_start_sect = hdi->primary[j].base;
int s = ext_start_sect;
int nr_1st_sub = (j - 1) * NR_SUB_PER_PART; /* 0/16/32/48 */
for(i = 0; i < NR_SUB_PER_PART; i++){
int dev_nr = nr_1st_sub + i;/* 0~15/16~31/32~47/48~63 */
get_part_table(drive, s, part_table);
hdi->logical[dev_nr].base = s + part_table[0].start_sect;
hdi->logical[dev_nr].size = part_table[0].nr_sects;
s = ext_start_sect + part_table[1].start_sect;
if(part_table[1].sys_id == NO_PART)
break;
}
}
else
disp_str("con't hadle such TYPE of partition\n");
}
PUBLIC struct hd_info* kernelHdOpen(int device)
{
int drive = DRV_OF_DEV(device);
if(drive != 0)
{
disp_str("hd open error\n");
}
kernelHdIdentify(drive);
if(hd_info[drive].open_cnt++ == 0){
partition(drive * (NR_PART_PER_DRIVE + 1), P_PRIMARY);
//print_hdinfo(&hd_info[drive]);
}
return &(hd_info[0]);
}
/**
* <Ring 1> This routine handles DEV_OPEN message. It identify the drive
* of the given device and read the partition table of the drive if it
* has not been read.
*
* @param device The device to be opened.
*****************************************************************************/
PRIVATE void hd_open(int device)
{
int drive = DRV_OF_DEV(device);
ERIC_HD("\nHD_open=%x",drive);
assert(drive == 0); /* only one drive */
hd_identify(drive);
// ++的優先權很高, 而 == 號優先權約在中間，所以要小心
if (hd_info[drive].open_cnt++ == 0) {
//列印主分區，每個hd都只有4個主分區
partition(drive * (NR_PART_PER_DRIVE + 1), P_PRIMARY);
print_hdinfo(&hd_info[drive]);
}
}
PRIVATE void hd_ioctl(MESSAGE *p)
{
int device = p->DEVICE;
int drive = DRV_OF_DEV(device);
struct hd_info *hdi = &hdinfo[drive];
if (p->REQUEST == DIOCTL_GET_GEO) {
void *dst = va2la(p->PROC_NR, p->BUF);
void *src = va2la(TASK_HD,
device < MAX_PRIM ?
&hdi->primary[device] :
&hdi->logical[(device - MINOR_hd1a) % NR_SUB_PER_DRIVE]);
phys_copy(dst, src, sizeof (struct part_info));
} else {
kprintf("[KERNEL ERROR]error ioctl cmd\n");
}
}
PRIVAATE void hd_rdwt(MESSAGE *p)
{
int drive = DRV_OF_DEV(p->DEVICE);
u64_t pos = p->POSITION;
u32_t sect_nr = (u32_t)(pos >> SECTOR_SIZE_SHIFT);
int logidx = (p->DEVICE - MINOR_HD1a) % NR_SUB_PER_DRIVE;
sect_nr += p->DEVICE < MAX_PRIM ?
hd_info[drive].primary[p->DEVICE].base :
hd_info[drive].logical[logidx].base;
struct hd_cmd cmd;
cmd.features = 0;
cmd.count = (p->CNT + SECTOR_SIZE - 1) / SECTOR_SIZE;
cmd.lba_low = sect_nr & 0xff;
cmd.lba_mid = (sect_nr >> 8) & 0xff;
cmd.lba_high = (sect_nr >> 16) & 0xff;
cmd.device = MAKE_DEVICE_REG(1, drive, (sect_nr >> 24) & 0xf);
cmd.command = (p->type == DEV_READ) ? ATA_READ : ATA_WRITE;
hd_cmd_out(&cmd);
int bytes_left = p->CNT;
void *la = (void*)va2la(p->PROC_NR, p->BUF);
while (bytes_left) {
int bytes = min(SECTOR_SIZE, bytes_left);
if (p->type == DEV_READ) {
interrupt_wait();
port_read(REG_DATA, hdbuf, SECTOR_SIZE);
phys_copy(la, (void*)va2la(TASK_HD, hdbuf), bytes);
} else {
if (!waitfor(STATUS_DRQ, STATUS_DRQ, HD_TIMEOUT)) {
kprintf("[KERNEL ERROR]hd writing error.\n");
break;
}
port_write(REG_DATA, la, bytes);
interrupt_wait();
}
bytes_left -= SECTOR_SIZE;
la += SECTOR_SIZE;
}
}
/*
* <ring 1> this routine handles the DEV_IOCTL messge.
*
* @param msg - message.
*/
static void hd_ioctl(MESSAGE *msg)
{
int device = msg->DEVICE;
int drive = DRV_OF_DEV(device);
struct hd_info *hdi = &hd_info[drive];
if (msg->REQUEST == DIOCTL_GET_GEO)
{
void *dst = va2la(msg->PROC_NR, msg->BUF);
void *src = va2la(TASK_HD, device < MAX_PRIM ?
&hdi->primary[device] :
&hdi->logical[(device - MINOR_hd1a) % NR_SUB_PER_DRIVE]);
phys_copy(dst, src, sizeof(struct part_info));
}
else
{
assert(0);
}
}
PRIVATE void hd_rdwt(MESSAGE* p_msg) {
int drive = DRV_OF_DEV(p_msg -> DEVICE);
u64 pos = p_msg -> POSITION;
assert((pos & 0x1FF) == 0); /* 只允许从扇区边界开始读 */
u32 sect_nr = (u32)(pos >> SECTOR_SIZE_SHIFT);
int logidx = (p_msg -> DEVICE - MINOR_hd1a) % NR_SUB_PER_DRIVE;
sect_nr += p_msg -> DEVICE < MAX_PRIM ? hd_info[drive].primary[p_msg -> DEVICE].base : hd_info[drive].logical[logidx].base;
HD_CMD cmd;
cmd.features = 0;
cmd.count = (p_msg -> CNT + SECTOR_SIZE - 1) / SECTOR_SIZE;
cmd.lba_low = sect_nr & 0xFF;
cmd.lba_mid = (sect_nr >> 8) & 0xFF;
cmd.lba_high = (sect_nr >> 16) & 0xFF;
cmd.device = MAKE_DEVICE_REG(1, drive, (sect_nr >> 24) & 0xF);
cmd.command = (p_msg -> type == DEV_READ) ? ATA_READ : ATA_WRITE;
hd_cmd_out(&cmd);
int bytes_left = p_msg -> CNT;
void* la = (void*)va2la(p_msg -> PROC_NR, p_msg -> BUF);
while (bytes_left > 0) {
int bytes = min(bytes_left, SECTOR_SIZE);
if (p_msg -> type == DEV_READ) {
/* 一次中断一个扇区 */
interrupt_wait();
port_read(REG_DATA, hdbuf, SECTOR_SIZE);
memcpy(la, (void*)va2la(TASK_HD, hdbuf), bytes);
} else {
if (!waitfor(STATUS_DRQ, STATUS_DRQ, HD_TIMEOUT))
panic("HD writing error");
port_write(REG_DATA, la, bytes);
interrupt_wait();
}
la += bytes;
bytes_left -= bytes;
}
}
/* 关闭硬盘 */
PRIVATE void hd_close(int device) {
int drive = DRV_OF_DEV(device);
assert(drive == 0); /* 只有一块硬盘 */
hd_info[drive].open_cnt--; /* 打开次数减一 */
}
PRIVATE void hd_close(int device)
{
int drive = DRV_OF_DEV(device);
hd_info[drive].open_cnt--;
}
PUBLIC void kernelHdWrite(u32 device, u64 position, u32 count, char* buf)
{
// disp_int((void*) kernelHdWrite);
// hd_status = hd_status & 0xf7;
// disp_str("after hd_status=");
// disp_int(hd_status);
// disp_str("\n");
// out_byte(REG_STATUS, hd_status);
// hd_status = in_byte(REG_STATUS);
// int drive = DRV_OF_DEV(device);
//
//
// if((position & 0x1FF) != 0)
// {
// disp_str("we only allow to R/W from a SECTOR boundary\n");
// }
//
// u32 sect_nr = (u32)(position >> SECTOR_SIZE_SHIFT);
// int logidx = (device - MINOR_hd1a) % NR_SUB_PER_DRIVE;
// sect_nr += device < MAX_PRIM ?
// hd_info[drive].primary[device].base :
// hd_info[drive].logical[logidx].base;
//
// struct hd_cmd cmd;
// cmd.features = 0;
// cmd.count = (count + SECTOR_SIZE - 1) / SECTOR_SIZE;
// disp_str("count: ");
// disp_int(cmd.count);
// cmd.lba_low = sect_nr & 0xFF;
// disp_str("\nlba_low: ");
// disp_int(cmd.lba_low);
// cmd.lba_mid = (sect_nr >> 8) & 0xFF;
// disp_str("\nlba_mid: ");
// disp_int(cmd.lba_mid);
// cmd.lba_high = (sect_nr >> 16) & 0xFF;
// disp_str("\nlba_high: ");
// disp_int(cmd.lba_high);
// cmd.device = MAKE_DEVICE_REG(1, drive, (sect_nr >> 24) & 0xF);
// disp_str("\ndevice: ");
// disp_int(cmd.device);
// cmd.command = ATA_WRITE;
// disp_str("\ncommand: ");
// disp_int(cmd.command);
// disp_str("\n");
// hd_cmd_out(&cmd);
// asm("sti");
//
// disp_str("cmd out");
// int bytes_left = count;
// while(bytes_left > 0){
// int bytes = (SECTOR_SIZE < bytes_left) ? SECTOR_SIZE : bytes_left;
//
// if(!waitfor(STATUS_DRQ, STATUS_DRQ, HD_TIMEOUT))
// disp_str("hd writing error.\n");
//
// port_write(REG_DATA, buf, bytes);
// hdIdentifyBlockEip = p_proc_running - proc_table;
// disp_int(hdIdentifyBlockEip);
// disp_str("before block!\n");
// asm("cli");
// kernelBlock();
// asm("sti");
// disp_str("after block!\n");
// bytes_left -= bytes;
// buf += bytes;
// }
int drive = DRV_OF_DEV(device);
u64 pos = position;
u32 sect_nr = (u32)(pos >> SECTOR_SIZE_SHIFT);
int logidx = (device - MINOR_hd1a) % NR_SUB_PER_DRIVE;
sect_nr += device < MAX_PRIM ?
hd_info[drive].primary[device].base :
hd_info[drive].logical[logidx].base;
struct hd_cmd cmd;
cmd.features = 0;
cmd.count = (count + SECTOR_SIZE - 1) / SECTOR_SIZE;
cmd.lba_low = sect_nr & 0xFF;
cmd.lba_mid = (sect_nr >> 8) & 0xFF;
cmd.lba_high = (sect_nr >> 16) & 0xFF;
cmd.device = MAKE_DEVICE_REG(1, drive, (sect_nr >> 24) & 0xF);
cmd.command = ATA_WRITE;
hd_cmd_out(&cmd);
int bytes_left = count;
while(bytes_left > 0){
int bytes = (SECTOR_SIZE < bytes_left) ? SECTOR_SIZE : bytes_left;
if(!waitfor(STATUS_DRQ, STATUS_DRQ, HD_TIMEOUT))
disp_str("hd writing error.\n");
port_write(REG_DATA, buf, bytes);
hdIdentifyBlockEip = p_proc_running - proc_table;
kernelBlock();
bytes_left -= bytes;
buf += bytes;
}
}
PUBLIC void kernelHdRead(u32 device, u64 position, u32 count, char* buf)
{
// hd_status = in_byte(REG_STATUS);
// disp_str("before hd_status=");
// disp_int(hd_status);
// disp_str("\n");
device = 0;
int drive = DRV_OF_DEV(device);
// disp_str("hdRead position: ");
// disp_int(position);
// if((position & 0x1FF) != 0)
// disp_str("we only allow to R/W from a SECTOR boundary\n");
int offset_in_block = position & 0x1FF;
u32 sect_nr = (u32)(position >> SECTOR_SIZE_SHIFT);
int logidx = (device - MINOR_hd1a) % NR_SUB_PER_DRIVE;
sect_nr += device < MAX_PRIM ?
hd_info[drive].primary[device].base :
hd_info[drive].logical[logidx].base;
struct hd_cmd cmd;
cmd.features = 0;
cmd.count = (offset_in_block + count + SECTOR_SIZE - 1) / SECTOR_SIZE;
cmd.lba_low = sect_nr & 0xFF;
cmd.lba_mid = (sect_nr >> 8) & 0xFF;
cmd.lba_high = (sect_nr >> 16) & 0xFF;
cmd.device = MAKE_DEVICE_REG(1, drive, (sect_nr >> 24) & 0xF);
cmd.command = ATA_READ;
hd_cmd_out(&cmd);
asm("cli");
int bytes_left = count;
// disp_int(count);
char** pbuf = &buf;
char blockBuf[SECTOR_SIZE] = {'\0'};
int firstFlag = 1;
while(bytes_left > 0){
// disp_str("in hd loop@@@");
// disp_str("hd, byte_lefs=");
// disp_int(bytes_left);
int bytes = ((SECTOR_SIZE - offset_in_block) < bytes_left )? (SECTOR_SIZE - offset_in_block) : bytes_left;
// disp_str("hd loop,bytes=");
// disp_int(bytes);
//
// disp_str("hd loop,beytes_left=");
// disp_int(bytes_left);
hdIdentifyBlockEip = p_proc_running - proc_table;
kernelBlock();
port_read(REG_DATA, blockBuf, SECTOR_SIZE);
if(!firstFlag)
offset_in_block = 0;
else
firstFlag = 0;
memcpy(*pbuf, &(blockBuf[offset_in_block]), bytes);
bytes_left -= bytes;
*pbuf += bytes;
// disp_str("hd loop,beytes_left=");
// disp_int(bytes_left);
}
}