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atahd: basic commands for disk I/O.

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This commit is contained in:
Maxim Poliakovski 2023-12-19 14:49:54 +01:00
parent ebdefb5acd
commit 679e80a7c3
3 changed files with 81 additions and 32 deletions
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3
devices/common/ata/atadefs.h
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@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
Copyright (C) 2018-23 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -139,6 +139,7 @@ enum ATA_Cmd : uint8_t {
WRITE_MULTIPLE = 0xC5,
READ_DMA = 0xC8,
WRITE_DMA = 0xCA,
FLUSH_CACHE = 0xE7, // ATA-5
WRITE_BUFFER_DMA = 0xE9,
READ_BUFFER_DMA = 0xEB,
IDENTIFY_DEVICE = 0xEC,

104
devices/common/ata/atahd.cpp
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@ -24,12 +24,13 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
#include <devices/common/ata/atahd.h>
#include <devices/deviceregistry.h>
#include <devices/common/ata/idechannel.h>
#include <loguru.hpp>
#include <machines/machinebase.h>
#include <memaccess.h>
#include <cstring>
#include <fstream>
#include <string>
#include <loguru.hpp>
using namespace ata_interface;
@ -65,12 +66,12 @@ void AtaHardDisk::insert_image(std::string filename) {
}
this->img_size = this->hdd_img.size();
this->total_sectors = this->hdd_img.size() / ATA_HD_SEC_SIZE;
}
int AtaHardDisk::perform_command()
{
LOG_F(INFO, "%s: command 0x%x requested", this->name.c_str(), this->r_command);
int AtaHardDisk::perform_command() {
this->r_status |= BSY;
this->r_error = 0;
switch (this->r_command) {
case NOP:
@ -82,21 +83,31 @@ int AtaHardDisk::perform_command()
break;
case READ_SECTOR:
case READ_SECTOR_NR: {
uint16_t sec_count = this->r_sect_count ? this->r_sect_count : 256;
this->xfer_cnt = sec_count * ATA_HD_SEC_SIZE;
uint64_t offset = this->get_lba() * ATA_HD_SEC_SIZE;
hdd_img.read(buffer, offset, this->xfer_cnt);
this->data_ptr = (uint16_t *)this->buffer;
this->signal_data_ready();
}
break;
uint16_t sec_count = this->r_sect_count ? this->r_sect_count : 256;
int xfer_size = sec_count * ATA_HD_SEC_SIZE;
uint64_t offset = this->get_lba() * ATA_HD_SEC_SIZE;
hdd_img.read(buffer, offset, xfer_size);
this->data_ptr = (uint16_t *)this->buffer;
// those commands should generate IRQ for each sector
this->prepare_xfer(xfer_size, ATA_HD_SEC_SIZE);
this->signal_data_ready();
}
break;
case WRITE_SECTOR:
case WRITE_SECTOR_NR: {
uint16_t sec_count = this->r_sect_count ? this->r_sect_count : 256;
uint64_t offset = this->get_lba() * ATA_HD_SEC_SIZE;
hdd_img.write(buffer, offset, sec_count * ATA_HD_SEC_SIZE);
}
break;
uint16_t sec_count = this->r_sect_count ? this->r_sect_count : 256;
this->cur_fpos = this->get_lba() * ATA_HD_SEC_SIZE;
this->data_ptr = (uint16_t *)this->buffer;
this->cur_data_ptr = this->data_ptr;
this->prepare_xfer(sec_count * ATA_HD_SEC_SIZE, ATA_HD_SEC_SIZE);
this->post_xfer_action = [this]() {
this->hdd_img.write(this->data_ptr, this->cur_fpos, this->chunk_size);
this->cur_fpos += this->chunk_size;
};
this->r_status |= DRQ;
this->r_status &= ~BSY;
}
break;
case INIT_DEV_PARAM:
// update fictive disk geometry with parameters from host
this->sectors = this->r_sect_count;
@ -104,19 +115,47 @@ int AtaHardDisk::perform_command()
this->r_status &= ~BSY;
this->update_intrq(1);
break;
case DIAGNOSTICS: {
this->r_status |= DRQ;
int ret_code = this->r_error;
this->r_status &= ~DRQ;
return ret_code;
}
break;
case DIAGNOSTICS:
this->r_error = 1;
this->device_set_signature();
break;
case FLUSH_CACHE: // used by the XNU kernel driver
this->r_status &= ~(BSY | DRQ | ERR);
this->update_intrq(1);
break;
case IDENTIFY_DEVICE:
this->prepare_identify_info();
this->data_ptr = (uint16_t *)this->data_buf;
this->xfer_cnt = ATA_HD_SEC_SIZE;
this->prepare_xfer(ATA_HD_SEC_SIZE, ATA_HD_SEC_SIZE);
this->signal_data_ready();
break;
case SET_FEATURES:
if (this->r_features == 3) {
switch(this->r_sect_count >> 3) {
case 0:
LOG_F(INFO, "%s: default transfer mode requested", this->name.c_str());
break;
case 1:
LOG_F(INFO, "%s: PIO transfer mode set to 0x%X", this->name.c_str(),
this->r_sect_count & 7);
break;
case 4:
LOG_F(INFO, "%s: Multiword DMA mode set to 0x%X", this->name.c_str(),
this->r_sect_count & 7);
break;
default:
LOG_F(ERROR, "%s: unsupported transfer mode 0x%X", this->name.c_str(),
this->r_sect_count);
this->r_error |= ATA_Error::ABRT;
this->r_status |= ATA_Status::ERR;
}
} else {
LOG_F(WARNING, "%s: unsupported SET_FEATURES subcommand code 0x%X",
this->name.c_str(), this->r_features);
}
this->r_status &= ~BSY;
this->update_intrq(1);
break;
default:
LOG_F(ERROR, "%s: unknown ATA command 0x%x", this->name.c_str(), this->r_command);
this->r_status &= ~BSY;
@ -131,10 +170,17 @@ void AtaHardDisk::prepare_identify_info() {
std::memset(this->data_buf, 0, sizeof(this->data_buf));
buf_ptr[0] = 0x0040; // ATA device, non-removable media, non-removable drive
buf_ptr[1] = 965;
buf_ptr[3] = 5;
buf_ptr[6] = 17;
buf_ptr[ 0] = 0x0040; // ATA device, non-removable media, non-removable drive
buf_ptr[49] = 0x200; // report LBA support
// TODO: replace this fictive CHS geometry with the proper one
buf_ptr[ 1] = 965;
buf_ptr[ 3] = 5;
buf_ptr[ 6] = 17;
// report LBA capacity
WRITE_WORD_LE_A(&buf_ptr[60], (this->total_sectors & 0xFFFFU));
WRITE_WORD_LE_A(&buf_ptr[61], (this->total_sectors >> 16) & 0xFFFFU);
}
uint64_t AtaHardDisk::get_lba() {

6
devices/common/ata/atahd.h
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@ -51,8 +51,10 @@ protected:
uint64_t get_lba();
private:
ImgFile hdd_img;
uint64_t img_size;
ImgFile hdd_img;
uint64_t img_size = 0;
uint32_t total_sectors = 0;
uint64_t cur_fpos = 0;
// fictive disk geometry for CHS-to-LBA translation
uint16_t cylinders;