88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
#include <base.hpp>
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#include <blockdev.hpp>
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#include <io.h>
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#include <textDISP.hpp>
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#include <string.h>
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#define ATAPIO_ERR 0x01
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#define ATAPIO_DRQ 0x08
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#define ATAPIO_SRV 0x10
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#define ATAPIO_DF 0x20
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#define ATAPIO_RDY 0x40
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#define ATAPIO_BSY 0x80
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#define DATA 0
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#define ATAPI_RESV 1
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#define SECTOR_CNT 2
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#define LBAlo 3
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#define LBAmid 4
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#define LBAhi 5
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#define DRV 6
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#define CMD 7
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#define ALTCMD 0x206
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namespace MTGosHAL {
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IDE::IDE(uint16_t baseport, uint8_t num): baseport(baseport), num(num), existent(0), numDevices(0) {
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if(inb(baseport+CMD)!=0xFF) { //Does the ATA controller return floating bus?
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// Checking existence of the master
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outb(baseport+DRV, 0xE0);
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outb(baseport+LBAlo,0x55);
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if(inb(baseport+LBAlo)==0x55) {
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existent|=1;
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numDevices++;
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}
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// Checking existence of the slave
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outb(baseport+DRV, 0xF0);
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outb(baseport+LBAlo,0x55);
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if(inb(baseport+LBAlo)==0x55) {
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existent|=2;
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numDevices++;
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}
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} else {
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err << "ATA device could not be found!\n";
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}
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outb(baseport+ALTCMD,0x40);
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inb(baseport+CMD);
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inb(baseport+CMD);
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inb(baseport+CMD);
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outb(baseport+ALTCMD,0x00);
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}
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auto IDE::getDriveCnt() -> int32_t {return numDevices;}
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auto IDE::getDriveNumByName(const char* name) -> int32_t {
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if(strlen(name)!=5)
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return -1; //Format is ATA[0-3][sm] (regex)
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if((name[0]!=name[2])||(name[2]!='A'))
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return -1;
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if(name[1]!='T')
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return -1;
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int32_t drivenum=name[3]-0x30;
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if(drivenum!=num)
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return -1;
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if((name[4]!='s')&&(name[4]!='m'))
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return -1;
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drivenum<<=1;
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drivenum+=(name[4]=='s')?1:0;
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if(!(existent&(1<<drivenum)))
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return -1;
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return drivenum;
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}
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auto IDE::readSector(int32_t drive, uint64_t sectorNum, uint8_t *buf) -> void {
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if(drive<(num*2)||drive>(num*2+1))
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return;
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if(!(existent&(1<<(drive-num*2))))
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return;
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outb(baseport+DRV, 0x40 | (drive&1)<<4);
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outb(baseport+SECTOR_CNT, 0);
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outb(baseport+LBAlo, (uint8_t)(sectorNum>>24));
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outb(baseport+LBAmid, (uint8_t)(sectorNum>>32));
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outb(baseport+LBAhi, (uint8_t)(sectorNum>>40));
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outb(baseport+SECTOR_CNT, 1);
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outb(baseport+LBAlo, (uint8_t)(sectorNum));
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outb(baseport+LBAmid, (uint8_t)(sectorNum>>8));
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outb(baseport+LBAhi, (uint8_t)(sectorNum>>16));
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outb(baseport+CMD, 0x24);
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inb(baseport+CMD);
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inb(baseport+CMD);
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inb(baseport+CMD);
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while(inb(baseport+CMD)&0x80);
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uint16_t *bufw=(uint16_t *)buf;
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asm volatile ("rep insw" : : "D"((int)bufw),"d"(baseport),"c"(256));
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}
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}
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