diff options
Diffstat (limited to 'src/kernel/fs/ata_pio.c')
| -rw-r--r-- | src/kernel/fs/ata_pio.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/src/kernel/fs/ata_pio.c b/src/kernel/fs/ata_pio.c new file mode 100644 index 0000000..d577ea1 --- /dev/null +++ b/src/kernel/fs/ata_pio.c @@ -0,0 +1,125 @@ +#include <kernel/io/io.h> +#include <kernel/lib/alloc.h> +#include <kernel/fs/ata_pio.h> +#include <kernel/interrupts/interrupts.h> + +struct ATA_INTERFACE *new_ATA(uint8_t master, uint16_t portBase) { + struct ATA_INTERFACE *ret = kmalloc(sizeof(struct ATA_INTERFACE)); + + ret->master = master; + ret->dataPort = portBase; + ret->errorPort = portBase + 0x1; + ret->sectorCountPort = portBase + 0x2; + ret->lbaLowPort = portBase + 0x3; + ret->lbaMidPort = portBase + 0x4; + ret->lbaHiPort = portBase + 0x5; + ret->devicePort = portBase + 0x6; + ret->commandPort = portBase + 0x7; + ret->controlPort = portBase + 0x206; + + // isr_ignore(0x06); + // isr_ignore(0x2E); + // isr_ignore(0x2F); + + return ret; +} + +uint8_t ATA_identify(struct ATA_INTERFACE *iface, uint16_t *retdata) { + send_b(iface->devicePort, iface->master ? 0xA0 : 0xB0); + send_b(iface->controlPort, 0); + + send_b(iface->devicePort, 0xA0); + uint8_t status = receive_b(iface->commandPort); + if (status == 0xFF) return 1; + + send_b(iface->devicePort, iface->master ? 0xA0 : 0xB0); + send_b(iface->sectorCountPort, 0); + send_b(iface->lbaLowPort, 0); + send_b(iface->lbaMidPort, 0); + send_b(iface->lbaHiPort, 0); + send_b(iface->commandPort, 0xEC); // Identify command + + status = receive_b(iface->commandPort); + if (!status) return 1; + + while (((status & 0x80) == 0x80) && ((status & 0x01) != 0x01)) { + status = receive_b(iface->commandPort); + } + + if (status & 0x01) return 1; + + for (int i = 0; i < 256; i++) retdata[i] = receive_w(iface->dataPort); + return 0; +} + +uint8_t *ATA_read28(struct ATA_INTERFACE *iface, uint32_t sector) { + if (sector > 0x0FFFFFFF) return 0; + + send_b(iface->devicePort, (iface->master ? 0xE0 : 0xF0) | ((sector & 0x0F000000) >> 24)); + + uint8_t status; + for (int i = 0; i < 5; i++) status = receive_b(iface->commandPort); + if (status == 0xFF) return 0; + + send_b(iface->errorPort, 0); + send_b(iface->sectorCountPort, 1); + send_b(iface->lbaLowPort, sector & 0x000000FF); + send_b(iface->lbaMidPort, (sector & 0x0000FF00) >> 8); + send_b(iface->lbaHiPort, (sector & 0x00FF0000) >> 16); + send_b(iface->commandPort, 0x20); // Read command + + status = receive_b(iface->commandPort); + while ((status & 0x80) && !(status & 0x01)) status = receive_b(iface->commandPort); + + uint8_t *ret = kmalloc(BYTES_PER_SECTOR); + for (int i = 0; i < BYTES_PER_SECTOR; i += 2) { + uint16_t data = receive_w(iface->dataPort); + ret[i] = data & 0xFF; + ret[i + 1] = (data >> 8) & 0xFF; + } + return ret; +} + +uint8_t ATA_write28(struct ATA_INTERFACE *iface, uint32_t sector, uint8_t *contents) { + if (sector > 0x0FFFFFFF) return 1; + asm volatile ("cli"); + + send_b(iface->devicePort, (iface->master ? 0xE0 : 0xF0) | ((sector & 0x0F000000) >> 24)); + + uint8_t status; + for (int i = 0; i < 5; i++) status = receive_b(iface->commandPort); + if (status == 0xFF) return 1; + + send_b(iface->errorPort, 0); + send_b(iface->sectorCountPort, 1); + send_b(iface->lbaLowPort, sector & 0x000000FF); + send_b(iface->lbaMidPort, (sector & 0x0000FF00) >> 8); + send_b(iface->lbaHiPort, (sector & 0x00FF0000) >> 16); + send_b(iface->commandPort, 0x30); // Write command + + while ((status & 0x80) || !(status & 0x08)) status = receive_b(iface->commandPort); + + if (status & (0x01 || 0x20)) return 2; + + for (int i = 0; i < BYTES_PER_SECTOR; i += 2) { + uint16_t data = contents[i]; + data |= ((uint16_t) contents[i + 1]) << 8; + send_w(iface->dataPort, data); + } + + send_b(iface->commandPort, 0xE7); // Flush command + + for (int i = 0; i < 5; i++) status = receive_b(iface->commandPort); + if (!status) return 3; + + while ((status & 0x80) && !(status & 0x01)) { + status = receive_b(iface->commandPort); + } + + return 0; +} + +uint8_t ATA_clear28(struct ATA_INTERFACE *iface, uint32_t sector) { + uint8_t emptysector[512] = {0}; + return ATA_write28(iface, sector, emptysector); +}
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