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video/pc_vga_tseng: stub ACL/MMU infrastracture

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This commit is contained in:
angelosa 2024-11-17 14:49:13 +01:00
parent 40d8c5c343
commit 2950b39bc7
3 changed files with 109 additions and 3 deletions
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8
src/devices/bus/isa/svga_tseng.cpp
View File

@ -201,16 +201,20 @@ void isa16_svga_et4k_w32i_device::remap(int space_id, offs_t start, offs_t end)
if (space_id == AS_PROGRAM)
{
m_isa->install_memory(0xa0000, 0xbffff, read8sm_delegate(*m_vga, FUNC(tseng_vga_device::mem_r)), write8sm_delegate(*m_vga, FUNC(tseng_vga_device::mem_w)));
// TODO: can be disabled or narrowed thru TS Auxiliary Mode
m_isa->install_rom(this, 0xc0000, 0xc7fff, "vga_rom");
}
else if (space_id == AS_IO)
{
m_isa->install_device(0x03b0, 0x03df, *this, &isa16_svga_et4k_w32i_device::io_isa_map);
m_isa->install_device(0x0000, 0xffff, *this, &isa16_svga_et4k_w32i_device::io_isa_map);
}
}
void isa16_svga_et4k_w32i_device::io_isa_map(address_map &map)
{
map(0x00, 0x2f).m(m_vga, FUNC(tseng_vga_device::io_map));
map(0x03b0, 0x03df).m(m_vga, FUNC(et4kw32i_vga_device::io_map));
// IOD controls mirroring
map(0x210a, 0x210a).mirror(0x70).rw(m_vga, FUNC(et4kw32i_vga_device::acl_index_r), FUNC(et4kw32i_vga_device::acl_index_w));
map(0x210b, 0x210b).mirror(0x70).rw(m_vga, FUNC(et4kw32i_vga_device::acl_data_r), FUNC(et4kw32i_vga_device::acl_data_w));
}

85
src/devices/video/pc_vga_tseng.cpp
View File

@ -220,7 +220,7 @@ void tseng_vga_device::crtc_map(address_map &map)
})
);
// Horizontal overflow
// NOTE: undocumented in ET4000AX
// NOTE: undocumented in ET4000AX, may apply to w32i only
map(0x3f, 0x3f).lrw8(
NAME([this] (offs_t offset) {
return et4k.horz_overflow;
@ -229,6 +229,7 @@ void tseng_vga_device::crtc_map(address_map &map)
et4k.horz_overflow = data;
vga.crtc.horz_total = (vga.crtc.horz_total & 0xff) | ((data & 1) << 8);
vga.crtc.offset = (vga.crtc.offset & 0x00ff) | ((data & 0x80) << 1);
// TODO: bits 4 & 2 (horizontal sync and blank start, bit 8)
recompute_params();
})
);
@ -379,6 +380,18 @@ uint32_t tseng_vga_device::latch_start_addr()
et4kw32i_vga_device::et4kw32i_vga_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: tseng_vga_device(mconfig, tag, ET4KW32I_VGA, owner, clock)
{
m_acl_space_config = address_space_config("acl_regs", ENDIANNESS_LITTLE, 8, 8, 0, address_map_constructor(FUNC(et4kw32i_vga_device::acl_map), this));
m_mmu_space_config = address_space_config("mmu_regs", ENDIANNESS_LITTLE, 8, 15, 0, address_map_constructor(FUNC(et4kw32i_vga_device::mmu_map), this));
m_acl_idx = 0;
}
device_memory_interface::space_config_vector et4kw32i_vga_device::memory_space_config() const
{
auto r = svga_device::memory_space_config();
r.emplace_back(std::make_pair(EXT_REG, &m_acl_space_config));
r.emplace_back(std::make_pair(EXT_REG + 1, &m_mmu_space_config));
return r;
}
void et4kw32i_vga_device::crtc_map(address_map &map)
@ -434,3 +447,73 @@ void et4kw32i_vga_device::io_3cx_map(address_map &map)
);
}
u8 et4kw32i_vga_device::acl_index_r(offs_t offset)
{
return m_acl_idx;
}
void et4kw32i_vga_device::acl_index_w(offs_t offset, u8 data)
{
m_acl_idx = data;
}
u8 et4kw32i_vga_device::acl_data_r(offs_t offset)
{
return space(EXT_REG).read_byte(m_acl_idx);
}
void et4kw32i_vga_device::acl_data_w(offs_t offset, u8 data)
{
space(EXT_REG).write_byte(m_acl_idx, data);
}
void et4kw32i_vga_device::acl_map(address_map &map)
{
}
uint8_t et4kw32i_vga_device::mem_r(offs_t offset)
{
if(svga.rgb8_en || svga.rgb15_en || svga.rgb16_en || svga.rgb24_en)
{
if (et4k.vsconf1 & 0x28 && vga.gc.memory_map_sel)
{
const u32 mmu_address = vga.gc.memory_map_sel & 2 ? 0x08000 : 0x18000;
if ((offset & 0x18000) == mmu_address)
return space(EXT_REG + 1).read_byte(offset & 0x7fff);
}
offset &= 0xffff;
return svga_device::mem_linear_r(offset + svga.bank_r * 0x10000);
}
return vga_device::mem_r(offset);
}
void et4kw32i_vga_device::mem_w(offs_t offset, uint8_t data)
{
if(svga.rgb8_en || svga.rgb15_en || svga.rgb16_en || svga.rgb24_en)
{
if (et4k.vsconf1 & 0x28 && vga.gc.memory_map_sel)
{
const u32 mmu_address = vga.gc.memory_map_sel & 2 ? 0x08000 : 0x18000;
if ((offset & 0x18000) == mmu_address)
{
space(EXT_REG + 1).write_byte(offset & 0x7fff, data);
return;
}
}
offset &= 0xffff;
svga_device::mem_linear_w(offset + svga.bank_w * 0x10000, data);
return;
}
vga_device::mem_w(offset,data);
}
void et4kw32i_vga_device::mmu_map(address_map &map)
{
}

19
src/devices/video/pc_vga_tseng.h
View File

@ -69,9 +69,28 @@ public:
// construction/destruction
et4kw32i_vga_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
u8 acl_index_r(offs_t offset);
void acl_index_w(offs_t offset, u8 data);
u8 acl_data_r(offs_t offset);
void acl_data_w(offs_t offset, u8 data);
virtual uint8_t mem_r(offs_t offset) override;
virtual void mem_w(offs_t offset, uint8_t data) override;
protected:
virtual void crtc_map(address_map &map) override ATTR_COLD;
virtual void io_3cx_map(address_map &map) override ATTR_COLD;
private:
virtual space_config_vector memory_space_config() const override;
address_space_config m_acl_space_config;
address_space_config m_mmu_space_config;
void acl_map(address_map &map) ATTR_COLD;
void mmu_map(address_map &map) ATTR_COLD;
u8 m_acl_idx;
};