76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
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#include <k/atapi.h>
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#include <string.h>
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#include "atapi.h"
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#include "io.h"
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static struct atapi_drive drives[4] = { 0 };
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static void select_drive(uint16_t bus, uint8_t slave)
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{
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outb(ATA_REG_DRIVE(bus), slave);
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}
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static void busy_wait(uint16_t drive)
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{
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int res = 0;
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while (res & BSY)
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res = inb(ATA_REG_STATUS(drive));
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}
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static void wait_device_selection(uint16_t drive)
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{
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for (int i = 0; i < 4; ++i)
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inb(drive);
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}
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static uint8_t is_atapi_driver(uint16_t bus, uint8_t slave)
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{
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static uint8_t atapi_sig[] = { ATAPI_SIG_SC, ATAPI_SIG_LBA_LO,
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ATAPI_SIG_LBA_MI, ATAPI_SIG_LBA_HI };
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uint8_t sig[4];
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sig[0] = inb(ATA_REG_SECTOR_COUNT(bus));
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sig[1] = inb(ATA_REG_LBA_LO(bus));
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sig[2] = inb(ATA_REG_LBA_MI(bus));
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sig[3] = inb(ATA_REG_LBA_HI(bus));
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if (!memcmp(sig, atapi_sig, 4))
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{
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struct atapi_drive d = { bus, slave };
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if (bus == PRIMARY_REG)
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{
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if (slave)
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drives[1] = d;
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else
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drives[0] = d;
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}
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else
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{
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if (slave)
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drives[3] = d;
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else
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drives[2] = d;
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}
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return 1;
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}
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return 0;
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}
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void discover_atapi_drive(void)
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{
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// primary_reg
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outb(PRIMARY_DCR, SRST);
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outb(PRIMARY_DCR, INTERRUPT_DISABLE);
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select_drive(PRIMARY_REG, ATA_PORT_MASTER);
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wait_device_selection(PRIMARY_REG);
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is_atapi_driver(PRIMARY_REG, ATA_PORT_MASTER);
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// secondary_reg
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outb(SECONDARY_DCR, SRST);
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outb(SECONDARY_DCR, INTERRUPT_DISABLE);
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}
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