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atahd: report correct CHS parameters & capacity.

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This is required for Open Firmware 2.x to boot Mac OS X
and OpenDarwin.
This commit is contained in:
Maxim Poliakovski 2024-03-18 11:12:51 +01:00
parent fc6a4872d6
commit a9cb0cfb2a
2 changed files with 59 additions and 7 deletions
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62
devices/common/ata/atahd.cpp
View File

@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-23 divingkatae and maximum
Copyright (C) 2018-24 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -67,6 +67,7 @@ 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;
this->calc_chs_params();
}
int AtaHardDisk::perform_command() {
@ -171,12 +172,14 @@ 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[49] = 0x200; // report LBA support
buf_ptr[49] = 0x0200; // 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;
buf_ptr[ 1] = this->cylinders;
buf_ptr[ 3] = this->heads;
buf_ptr[ 6] = this->sectors;
buf_ptr[57] = this->total_sectors & 0xFFFFU;
buf_ptr[58] = (this->total_sectors >> 16) & 0xFFFFU;
// report LBA capacity
WRITE_WORD_LE_A(&buf_ptr[60], (this->total_sectors & 0xFFFFU));
@ -200,6 +203,53 @@ uint64_t AtaHardDisk::get_lba() {
}
}
void AtaHardDisk::calc_chs_params() {
unsigned num_blocks, heads, sectors, max_sectors;
LOG_F(INFO, "%s: total sectors %d", this->name.c_str(), this->total_sectors);
// use PC BIOS limit to keep number of sectors small for smaller disks
if (this->total_sectors >= ATA_BIOS_LIMIT)
max_sectors = 255;
else
max_sectors = 63;
num_blocks = this->total_sectors;
for (heads = 16; heads > 0; heads--)
if (!(num_blocks % heads))
break;
this->heads = heads;
if (!heads) {
LOG_F(WARNING, "%s: could not find a suitable number of heads",
this->name.c_str());
return;
}
num_blocks /= heads;
for (sectors = max_sectors; sectors > 0; sectors--) {
if (!(num_blocks % sectors)) {
if (num_blocks / sectors < 65536)
break;
}
}
this->sectors = sectors;
if (!sectors) {
LOG_F(WARNING, "%s: could not find a suitable CHS translation",
this->name.c_str());
return;
}
this->cylinders = num_blocks / sectors;
LOG_F(INFO, "%s: C=%d, H=%d, S=%d", this->name.c_str(), this->cylinders,
this->heads, this->sectors);
}
static const PropMap AtaHardDiskProperties = {
{"hdd_img", new StrProperty("")},
};

4
devices/common/ata/atahd.h
View File

@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-23 divingkatae and maximum
Copyright (C) 2018-24 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -30,6 +30,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
#include <string>
#define ATA_HD_SEC_SIZE 512
#define ATA_BIOS_LIMIT 16514064
class AtaHardDisk : public AtaBaseDevice
{
@ -49,6 +50,7 @@ public:
protected:
void prepare_identify_info();
uint64_t get_lba();
void calc_chs_params();
private:
ImgFile hdd_img;