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// license:BSD-3-Clause
// copyright-holders: Olivier Galibert
// Generic ST ROM cartridge
#include "emu.h"
#include "rom.h"
namespace {
class st_rom_device : public device_t, public device_stcart_interface, public device_image_interface
{
public:
st_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
virtual ~st_rom_device();
virtual void map(address_space_installer &space) override;
protected:
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
virtual bool is_readable() const noexcept override { return true; }
virtual bool is_writeable() const noexcept override { return false; }
virtual bool is_creatable() const noexcept override { return false; }
virtual bool is_reset_on_load() const noexcept override { return true; }
virtual const char *file_extensions() const noexcept override { return "bin,rom,stc"; }
virtual const char *image_interface() const noexcept override { return "st_cart"; }
virtual const char *image_type_name() const noexcept override { return "romimage"; }
virtual const char *image_brief_type_name() const noexcept override { return "rom"; }
virtual std::pair<std::error_condition, std::string> call_load() override;
private:
std::vector<u16> m_romdata;
};
st_rom_device::st_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, ST_ROM, tag, owner, clock),
device_stcart_interface(mconfig, *this),
device_image_interface(mconfig, *this)
{
}
st_rom_device::~st_rom_device()
{
}
void st_rom_device::map(address_space_installer &space)
{
if(m_romdata.empty())
return;
space.install_rom(0xfa0000, 0xfa0000 + m_romdata.size()*2 - 1, 0x20000 - m_romdata.size()*2, m_romdata.data());
}
void st_rom_device::device_start()
{
}
void st_rom_device::device_reset()
{
}
std::pair<std::error_condition, std::string> st_rom_device::call_load()
{
u32 size = length();
u32 p2;
for(p2 = 0; size >= 1<<p2; p2++);
u32 size2 = 1 << (p2-1);
if((size2 != size && size2 != size-4) || size2 < 256 || size2 > 128*1024)
return std::make_pair(std::error_condition(image_error::INVALIDLENGTH), std::string("Invalid file size"));
if(size != size2)
fseek(4, SEEK_SET);
m_romdata.resize(size2/2);
fread(m_romdata.data(), size2);
#ifdef LSB_FIRST
for(u16 &c : m_romdata)
c = (c >> 8) | (c << 8);
#endif
return std::make_pair(std::error_condition(), std::string());
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(ST_ROM, device_stcart_interface, st_rom_device, "st_rom", "ST Rom cartridge")
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