Nigel
dea8ab7d71
Added new entries to .gitignore Moved away from source directory as central spot for all source code
146 lines
3.2 KiB
C++
146 lines
3.2 KiB
C++
#include "atapiDevice.h"
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#define IS_BIT_SET(x, bit) ((x >> bit & 0x1) == 1)
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bool isPacketDevice(){
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uint8_t LBAmid = inb(0x174);
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uint8_t LBAhi = inb(0x175);
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printf(" LBAmid: 0x%x, LBAhi: 0x%x");
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return LBAmid == 0x14 && LBAhi == 0xEB;
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}
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void ATAPI_DEVICE::Identify(uint8_t DEVICE_CHANNEL,DEVICE_DRIVE drive ){
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// lets ignore which port we actually want to check for now !
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/* THE STEPS INVOLVED
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1. Select the target drive by sending master (0x0A) or slave (0x0B) to the
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drive select IO port
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2. Set the Sectorcount, LBAlo, LBAmid and LBAhi IO ports to 0
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3. Send the identify command (0xEC) to the command IO port
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4. Read the status port
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4.2 If the value is 0x0 the drive does not exist
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4.3 If it has any other value continue
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5. poll the status port until bit 7 is clear.
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6. Check if the LBAmid and LBAhi ports are non-zero
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6.2. If non-zero stop polling this is not an ATA device
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6.3 If zero continue
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7. poll status port until bit 3 is set or bit 0 is set
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8. if err is clear, read the data from the data port
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*/
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// Select the target drive
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outb(0x176, 0xA0); // on the secondary bus select the master drive
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outb(0x170 + 0x206 , 0x0); // write 0 to the controlport for some reason
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outb(0x176, 0xA0);
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// read the status port
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uint8_t status = inb(0x177);
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printf("status after drive select: 0x%x\n",status);
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if( status == 0x00){
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printf("No drive\n");
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return;
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}
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outb(0x176, 0xA0);
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// Set the Sectorcount, LBAlo, LBAmid and LBAhi IO ports to 0
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outb(0x172, 0);
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outb(0x173, 0);
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outb(0x174, 0);
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outb(0x175, 0);
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// send the identify command;
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printf("command sent!\n");
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outb(0x177, 0xA1);
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// read the status port
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uint8_t status2 = inb(0x177);
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if( status2 == 0x00){
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printf("No drive\n");
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return;
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}
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printf("Waiting until ready...\n");
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while(((status2 & 0x80 == 0x80)
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&& (status2 & 0x01) != 0x01)
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) status2 = inb(0x177);
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if(status2 & 0x01){
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printf("Error!");
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return;
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}
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// READ DATA
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uint16_t deviceIdentify [256] ={0};
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for (int i= 0; i < 256; i++){
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uint16_t data;
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asm volatile ( "in %1, %0"
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: "=a"(data)
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: "Nd"(0x170) );
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deviceIdentify[i] = data ;
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}
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printf("Model-label (ASCII hex):\n");
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for(int i = 27; i < 47; i++){
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printf(" %x ",deviceIdentify[i]);
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}
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printf("\nSerial number (ASCII hex):\n");
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for (int i = 10; i < 19; i++){
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printf(" %x ", deviceIdentify[i]);
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}
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printf("\nFirmware revision (ASCII hex):\n");
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for (int i = 23; i < 26; i++){
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printf(" %x ", deviceIdentify[i]);
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}
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printf("\nConfiguration: %x\n", deviceIdentify[0]);
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printf("\nData received!\n");
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}
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void ATAPI_DEVICE::Read(uint8_t DEVICE_CHANNEL, DEVICE_DRIVE drive) {
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printf("Not implemented");
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}
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void ATAPI_DEVICE::Write(uint8_t DEVICE_CHANNEL, DEVICE_DRIVE drive) {
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printf("Not implemented");
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}
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