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/*
RCC-Project
Copyright (C) 2026 Richard Qin
This file is part of RCC-Project.
RCC-Project is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your option) any
later version.
RCC-Project is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
RCC-Project; see the file COPYING. If not see
<http://www.gnu.org/licenses/>.
*/
#include "bios.h"
#include "regs.h"
#define BIOS_CF 0x0001u
struct edd_packet
{
u8 size;
u8 reserved;
u16 count;
u16 buffer_offset;
u16 buffer_segment;
u32 lba_low;
u32 lba_high;
} __attribute__ ((packed));
struct edd_parameters
{
u16 size;
u16 flags;
u32 cylinders_low;
u32 cylinders_high;
u32 heads;
u32 sectors_per_track;
u32 total_sectors_low;
u32 total_sectors_high;
u16 bytes_per_sector;
} __attribute__ ((packed));
static void
int13_fail (struct bios_regs *regs)
{
regs->eax = 0x0100u;
regs->flags |= BIOS_CF;
}
static struct edd_packet *
get_edd_packet (struct bios_regs *regs)
{
u32 address;
address = ((u32)regs->ds << 4) + (u16)regs->esi;
return (struct edd_packet *)address;
}
static struct edd_parameters *
get_edd_parameters (struct bios_regs *regs)
{
u32 address;
address = ((u32)regs->ds << 4) + (u16)regs->esi;
return (struct edd_parameters *)address;
}
void
int13_service (struct bios_regs *regs)
{
u8 function;
struct edd_packet *packet;
u32 buffer_address;
function = (u8)(regs->eax >> 8);
if (function == 0x41u)
{
if (regs->ebx != 0x55AAu)
{
int13_fail (regs);
return;
}
regs->eax = 0x3000u;
regs->ebx = 0xAA55u;
regs->ecx |= 0x0001u;
regs->flags &= (u16)~BIOS_CF;
return;
}
if (function == 0x42u)
{
packet = get_edd_packet (regs);
if (packet->size != 0x10u || packet->count == 0u || packet->count > 127u
|| packet->lba_high != 0u
|| packet->lba_low > 0x10000000u - (u32)packet->count)
{
int13_fail (regs);
return;
}
buffer_address
= ((u32)packet->buffer_segment << 4) + packet->buffer_offset;
if (ata_read_sectors28 (packet->lba_low, (u16 *)buffer_address,
packet->count)
!= 0)
{
int13_fail (regs);
return;
}
regs->eax = 0;
regs->flags &= (u16)~BIOS_CF;
return;
}
if (function == 0x48u)
{
struct edd_parameters *parameters;
u16 cylinders;
u16 heads;
u16 sectors_per_track;
u32 total_sectors_low;
u32 total_sectors_high;
parameters = get_edd_parameters (regs);
if (parameters->size < 0x001Eu
|| ata_identify (&cylinders, &heads, §ors_per_track,
&total_sectors_low, &total_sectors_high)
!= 0)
{
int13_fail (regs);
return;
}
parameters->size = 0x001Eu;
parameters->flags = 0;
parameters->cylinders_low = cylinders;
parameters->cylinders_high = 0;
parameters->heads = heads;
parameters->sectors_per_track = sectors_per_track;
parameters->total_sectors_low = total_sectors_low;
parameters->total_sectors_high = total_sectors_high;
parameters->bytes_per_sector = 512;
regs->eax = 0;
regs->flags &= (u16)~BIOS_CF;
return;
}
int13_fail (regs);
}
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