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sun/sun3.cpp: Add DIAG/NORMAL switch (#12734)

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Adds a DIAG/NORMAL switch that affects how a Sun-3/60 (and other models)
are configured at boot.
This commit is contained in:
Chris Hanson 2024-09-19 18:20:35 -07:00 committed by GitHub
parent 2de274c1a2
commit d49d4e00c2
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GPG Key ID: B5690EEEBB952194
1 changed files with 18 additions and 3 deletions
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21
src/mame/sun/sun3.cpp
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@ -246,7 +246,8 @@ public:
m_rom(*this, "user1"),
m_idprom(*this, "idprom"),
m_ram(*this, RAM_TAG),
m_lance(*this, "lance")
m_lance(*this, "lance"),
m_diagsw(*this, "diagsw")
{ }
void sun3(machine_config &config);
@ -274,6 +275,7 @@ private:
required_memory_region m_rom, m_idprom;
required_device<ram_device> m_ram;
required_device<am79c90_device> m_lance;
required_ioport m_diagsw;
uint32_t tl_mmu_r(offs_t offset, uint32_t mem_mask = ~0);
void tl_mmu_w(offs_t offset, uint32_t data, uint32_t mem_mask = ~0);
@ -303,6 +305,8 @@ private:
void vmetype2space_map(address_map &map);
void vmetype3space_map(address_map &map);
uint32_t enable_r();
uint32_t *m_rom_ptr, *m_ram_ptr;
uint8_t *m_idprom_ptr;
uint32_t m_enable, m_diag, m_dvma_enable, m_parregs[8], m_irqctrl, m_ecc[4];
@ -474,7 +478,7 @@ uint32_t sun3_state::tl_mmu_r(offs_t offset, uint32_t mem_mask)
return m_context<<24;
case 4: // enable reg
return m_enable;
return enable_r();
case 5: // DVMA enable
return m_dvma_enable<<24;
@ -509,7 +513,7 @@ uint32_t sun3_state::tl_mmu_r(offs_t offset, uint32_t mem_mask)
}
// boot mode?
if ((fc == M68K_FC_SUPERVISOR_PROGRAM) && !(m_enable & 0x80))
if ((fc == M68K_FC_SUPERVISOR_PROGRAM) && !(enable_r() & 0x80))
{
return m_rom_ptr[offset & 0x3fff];
}
@ -811,6 +815,13 @@ void sun3_state::vmetype3space_map(address_map &map)
{
}
uint32_t sun3_state::enable_r()
{
// Incorporate diag switch value.
const uint32_t diagsw = m_diagsw->read() << 24;
return (m_enable & ~(u32(1) << 24)) | diagsw;
}
uint32_t sun3_state::irqctrl_r()
{
return m_irqctrl;
@ -978,6 +989,10 @@ uint32_t sun3_state::bw2_350_update(screen_device &screen, bitmap_rgb32 &bitmap,
/* Input ports */
static INPUT_PORTS_START( sun3 )
PORT_START("diagsw")
PORT_CONFNAME(1, 0, "Diagnostic Switch")
PORT_CONFSETTING(0, "Normal")
PORT_CONFSETTING(1, "Diagnostic")
INPUT_PORTS_END
void sun3_state::machine_start()