--- /dev/null
+#*
+#* memory handlers with banking support
+#* (C) notaz, 2007-2008
+#*
+#* This work is licensed under the terms of MAME license.
+#* See COPYING file in the top-level directory.
+#*
+
+# OUT OF DATE
+
+#include "pico_int_o32.h"
+
+.set noreorder
+.set noat
+
+.text
+.align 4
+
+# default jump tables
+
+m_read8_def_table:
+ .long m_read8_rom0 # 0x000000 - 0x07FFFF
+ .long m_read8_rom1 # 0x080000 - 0x0FFFFF
+ .long m_read8_rom2 # 0x100000 - 0x17FFFF
+ .long m_read8_rom3 # 0x180000 - 0x1FFFFF
+ .long m_read8_rom4 # 0x200000 - 0x27FFFF
+ .long m_read8_rom5 # 0x280000 - 0x2FFFFF
+ .long m_read8_rom6 # 0x300000 - 0x37FFFF
+ .long m_read8_rom7 # 0x380000 - 0x3FFFFF
+ .long m_read8_rom8 # 0x400000 - 0x47FFFF - for all those large ROM hacks
+ .long m_read8_rom9 # 0x480000 - 0x4FFFFF
+ .long m_read8_romA # 0x500000 - 0x57FFFF
+ .long m_read8_romB # 0x580000 - 0x5FFFFF
+ .long m_read8_romC # 0x600000 - 0x67FFFF
+ .long m_read8_romD # 0x680000 - 0x6FFFFF
+ .long m_read8_romE # 0x700000 - 0x77FFFF
+ .long m_read8_romF # 0x780000 - 0x7FFFFF
+ .long m_read8_rom10 # 0x800000 - 0x87FFFF
+ .long m_read8_rom11 # 0x880000 - 0x8FFFFF
+ .long m_read8_rom12 # 0x900000 - 0x97FFFF
+ .long m_read8_rom13 # 0x980000 - 0x9FFFFF
+ .long m_read8_misc # 0xA00000 - 0xA7FFFF
+ .long m_read_null # 0xA80000 - 0xAFFFFF
+ .long m_read_null # 0xB00000 - 0xB7FFFF
+ .long m_read_null # 0xB80000 - 0xBFFFFF
+ .long m_read8_vdp # 0xC00000 - 0xC7FFFF
+ .long m_read8_vdp # 0xC80000 - 0xCFFFFF
+ .long m_read8_vdp # 0xD00000 - 0xD7FFFF
+ .long m_read8_vdp # 0xD80000 - 0xDFFFFF
+ .long m_read8_ram # 0xE00000 - 0xE7FFFF
+ .long m_read8_ram # 0xE80000 - 0xEFFFFF
+ .long m_read8_ram # 0xF00000 - 0xF7FFFF
+ .long m_read8_ram # 0xF80000 - 0xFFFFFF
+
+m_read16_def_table:
+ .long m_read16_rom0 # 0x000000 - 0x07FFFF
+ .long m_read16_rom1 # 0x080000 - 0x0FFFFF
+ .long m_read16_rom2 # 0x100000 - 0x17FFFF
+ .long m_read16_rom3 # 0x180000 - 0x1FFFFF
+ .long m_read16_rom4 # 0x200000 - 0x27FFFF
+ .long m_read16_rom5 # 0x280000 - 0x2FFFFF
+ .long m_read16_rom6 # 0x300000 - 0x37FFFF
+ .long m_read16_rom7 # 0x380000 - 0x3FFFFF
+ .long m_read16_rom8 # 0x400000 - 0x47FFFF
+ .long m_read16_rom9 # 0x480000 - 0x4FFFFF
+ .long m_read16_romA # 0x500000 - 0x57FFFF
+ .long m_read16_romB # 0x580000 - 0x5FFFFF
+ .long m_read16_romC # 0x600000 - 0x67FFFF
+ .long m_read16_romD # 0x680000 - 0x6FFFFF
+ .long m_read16_romE # 0x700000 - 0x77FFFF
+ .long m_read16_romF # 0x780000 - 0x7FFFFF
+ .long m_read16_rom10 # 0x800000 - 0x87FFFF
+ .long m_read16_rom11 # 0x880000 - 0x8FFFFF
+ .long m_read16_rom12 # 0x900000 - 0x97FFFF
+ .long m_read16_rom13 # 0x980000 - 0x9FFFFF
+ .long m_read16_misc # 0xA00000 - 0xA7FFFF
+ .long m_read_null # 0xA80000 - 0xAFFFFF
+ .long m_read_null # 0xB00000 - 0xB7FFFF
+ .long m_read_null # 0xB80000 - 0xBFFFFF
+ .long m_read16_vdp # 0xC00000 - 0xC7FFFF
+ .long m_read16_vdp # 0xC80000 - 0xCFFFFF
+ .long m_read16_vdp # 0xD00000 - 0xD7FFFF
+ .long m_read16_vdp # 0xD80000 - 0xDFFFFF
+ .long m_read16_ram # 0xE00000 - 0xE7FFFF
+ .long m_read16_ram # 0xE80000 - 0xEFFFFF
+ .long m_read16_ram # 0xF00000 - 0xF7FFFF
+ .long m_read16_ram # 0xF80000 - 0xFFFFFF
+
+m_read32_def_table:
+ .long m_read32_rom0 # 0x000000 - 0x07FFFF
+ .long m_read32_rom1 # 0x080000 - 0x0FFFFF
+ .long m_read32_rom2 # 0x100000 - 0x17FFFF
+ .long m_read32_rom3 # 0x180000 - 0x1FFFFF
+ .long m_read32_rom4 # 0x200000 - 0x27FFFF
+ .long m_read32_rom5 # 0x280000 - 0x2FFFFF
+ .long m_read32_rom6 # 0x300000 - 0x37FFFF
+ .long m_read32_rom7 # 0x380000 - 0x3FFFFF
+ .long m_read32_rom8 # 0x400000 - 0x47FFFF
+ .long m_read32_rom9 # 0x480000 - 0x4FFFFF
+ .long m_read32_romA # 0x500000 - 0x57FFFF
+ .long m_read32_romB # 0x580000 - 0x5FFFFF
+ .long m_read32_romC # 0x600000 - 0x67FFFF
+ .long m_read32_romD # 0x680000 - 0x6FFFFF
+ .long m_read32_romE # 0x700000 - 0x77FFFF
+ .long m_read32_romF # 0x780000 - 0x7FFFFF
+ .long m_read32_rom10 # 0x800000 - 0x87FFFF
+ .long m_read32_rom11 # 0x880000 - 0x8FFFFF
+ .long m_read32_rom12 # 0x900000 - 0x97FFFF
+ .long m_read32_rom13 # 0x980000 - 0x9FFFFF
+ .long m_read32_misc # 0xA00000 - 0xA7FFFF
+ .long m_read_null # 0xA80000 - 0xAFFFFF
+ .long m_read_null # 0xB00000 - 0xB7FFFF
+ .long m_read_null # 0xB80000 - 0xBFFFFF
+ .long m_read32_vdp # 0xC00000 - 0xC7FFFF
+ .long m_read32_vdp # 0xC80000 - 0xCFFFFF
+ .long m_read32_vdp # 0xD00000 - 0xD7FFFF
+ .long m_read32_vdp # 0xD80000 - 0xDFFFFF
+ .long m_read32_ram # 0xE00000 - 0xE7FFFF
+ .long m_read32_ram # 0xE80000 - 0xEFFFFF
+ .long m_read32_ram # 0xF00000 - 0xF7FFFF
+ .long m_read32_ram # 0xF80000 - 0xFFFFFF
+
+
+# #############################################################################
+
+.bss
+.align 4
+
+# used tables
+m_read8_table:
+ .skip 32*4
+
+m_read16_table:
+ .skip 32*4
+
+m_read32_table:
+ .skip 32*4
+
+
+# #############################################################################
+
+.text
+.align 4
+
+.global PicoMemReset
+.global PicoRead8
+.global PicoRead16
+.global PicoRead32
+.global PicoWriteRomHW_SSF2
+
+.global m_read8_def_table
+.global m_read8_table
+
+.macro PicoMemResetCopyDef dst_table src_table
+ lui $t0, %hi(\dst_table)
+ addiu $t0, %lo(\dst_table)
+ lui $t1, %hi(\src_table)
+ addiu $t1, %lo(\src_table)
+ li $t2, 32
+1:
+ lw $t3, 0($t1)
+ sw $t3, 0($t0)
+ addiu $t2, -1
+ addiu $t1, 4
+ bnez $t2, 1b
+ addiu $t0, 4
+.endm
+
+# $t4 = 4
+.macro PicoMemResetRomArea dst_table ar_label
+ lui $t0, %hi(\dst_table)
+ addiu $t0, %lo(\dst_table)
+ lui $t1, %hi(\ar_label)
+ addiu $t1, %lo(\ar_label)
+ li $t2, 20
+1:
+ beq $t2, $v1, 2f
+ addiu $t2, -1
+ sll $t3, $t2, 2
+ beq $t2, $t4, 1b # do not touch the SRAM area
+ addu $t3, $t0
+ j 1b
+ sw $t1, 0($t3)
+2:
+.endm
+
+
+PicoMemReset:
+ lui $v1, %hi(Pico+OFS_Pico_romsize)
+ lw $v1, %lo(Pico+OFS_Pico_romsize)($v1) # romsize
+ lui $t0, 8
+ addu $v1, $t0
+ addiu $v1, -1
+ srl $v1, 19
+
+ PicoMemResetCopyDef m_read8_table m_read8_def_table
+ PicoMemResetCopyDef m_read16_table m_read16_def_table
+ PicoMemResetCopyDef m_read32_table m_read32_def_table
+
+ # update memhandlers according to ROM size
+ li $t4, 4
+ PicoMemResetRomArea m_read8_table m_read8_above_rom
+ PicoMemResetRomArea m_read16_table m_read16_above_rom
+ PicoMemResetRomArea m_read32_table m_read32_above_rom
+
+ jr $ra
+ nop
+
+# #############################################################################
+
+.macro PicoReadJump table
+ lui $t0, %hi(\table)
+ srl $t1, $a0, 19
+ ins $t0, $t1, 2, 5
+ lw $t0, %lo(\table)($t0)
+ ins $a0, $0, 24, 8
+ jr $t0
+ nop
+.endm
+
+PicoRead8: # u32 a
+ PicoReadJump m_read8_table
+
+PicoRead16: # u32 a
+ PicoReadJump m_read16_table
+
+PicoRead32: # u32 a
+ PicoReadJump m_read32_table
+
+# #############################################################################
+
+m_read_null:
+ jr $ra
+ li $v0, 0
+
+m_read_neg1:
+ jr $ra
+ addiu $v0, $0, 0xffff
+
+# loads &Pico to $t3
+.macro m_read_rom_try_sram is200000 size
+ lui $t2, %hi(Pico)
+ addiu $t2, %lo(Pico)
+ lw $t1, OFS_Pico_sv_end($t2)
+.if \is200000
+ ins $a0, $0, 19, 13
+ lui $t4, 0x20
+ or $a0, $t4
+.endif
+ subu $t4, $a0, $t1
+ bgtz $t4, 1f
+ lw $t1, OFS_Pico_sv_start($t2)
+ subu $t4, $t1, $a0
+ bgtz $t4, 1f
+ nop
+ lb $t1, OFS_Pico_m_sram_reg($t2)
+ andi $t4, $t1, 5
+ beqz $t4, 1f
+ nop
+.if \size == 8
+ j SRAMRead
+ nop
+.elseif \size == 16
+ sw $ra, -4($sp)
+ jal SRAMRead16
+ addiu $sp, -4
+ lw $ra, 0($sp)
+ jr $ra
+ addiu $sp, 4
+.else
+ addiu $sp, -8
+ sw $ra, 0($sp)
+ sw $a0, 4($sp)
+ jal SRAMRead16
+ nop
+ lw $a0, 4($sp)
+ sw $v0, 4($sp)
+ jal SRAMRead16
+ addiu $a0, 2
+ lw $v1, 4($sp)
+ lw $ra, 0($sp)
+ addiu $sp, 8
+ jr $ra
+ ins $v0, $v1, 16, 16
+.endif
+# m_read_nosram:
+1:
+.endm
+
+.macro m_read8_rom sect
+ lui $t0, %hi(Pico+OFS_Pico_rom)
+ lw $t0, %lo(Pico+OFS_Pico_rom)($t0) # rom
+ xori $a0, 1
+ ins $a0, $0, 19, 13
+.if \sect
+ lui $t1, 8*\sect
+ addu $a0, $t1
+.endif
+ addu $t0, $a0
+ jr $ra
+ lb $v0, 0($t0)
+.endm
+
+
+m_read8_rom0: # 0x000000 - 0x07ffff
+ m_read8_rom 0
+
+m_read8_rom1: # 0x080000 - 0x0fffff
+ m_read8_rom 1
+
+m_read8_rom2: # 0x100000 - 0x17ffff
+ m_read8_rom 2
+
+m_read8_rom3: # 0x180000 - 0x1fffff
+ m_read8_rom 3
+
+m_read8_rom4: # 0x200000 - 0x27ffff, SRAM area
+ m_read_rom_try_sram 1 8
+ lw $t1, 4($t3) # romsize
+ subu $t4, $t1, $a0
+ blez $t4, m_read_null
+ lw $t1, 0($t3) # rom
+ xori $a0, 1
+ addu $t1, $a0
+ jr $ra
+ lb $v0, 0($t1)
+
+m_read8_rom5: # 0x280000 - 0x2fffff
+ m_read8_rom 5
+
+m_read8_rom6: # 0x300000 - 0x37ffff
+ m_read8_rom 6
+
+m_read8_rom7: # 0x380000 - 0x3fffff
+ m_read8_rom 7
+
+m_read8_rom8: # 0x400000 - 0x47ffff
+ m_read8_rom 8
+
+m_read8_rom9: # 0x480000 - 0x4fffff
+ m_read8_rom 9
+
+m_read8_romA: # 0x500000 - 0x57ffff
+ m_read8_rom 0xA
+
+m_read8_romB: # 0x580000 - 0x5fffff
+ m_read8_rom 0xB
+
+m_read8_romC: # 0x600000 - 0x67ffff
+ m_read8_rom 0xC
+
+m_read8_romD: # 0x680000 - 0x6fffff
+ m_read8_rom 0xD
+
+m_read8_romE: # 0x700000 - 0x77ffff
+ m_read8_rom 0xE
+
+m_read8_romF: # 0x780000 - 0x7fffff
+ m_read8_rom 0xF
+
+m_read8_rom10: # 0x800000 - 0x87ffff
+ m_read8_rom 0x10
+
+m_read8_rom11: # 0x880000 - 0x8fffff
+ m_read8_rom 0x11
+
+m_read8_rom12: # 0x900000 - 0x97ffff
+ m_read8_rom 0x12
+
+m_read8_rom13: # 0x980000 - 0x9fffff
+ m_read8_rom 0x13
+
+
+m_read8_misc:
+ srl $t0, $a0, 5
+ sll $t0, $t0, 5
+ lui $t1, 0xa1
+ bne $t0, $t1, m_read8_misc2
+ andi $t0, $a0, 0x1e
+m_read8_misc_io:
+ beqz $t0, m_read8_misc_hwreg
+ sub $t1, $t0, 4
+ bgtz $t1, m_read8_misc_ioports
+ nop
+ slti $a0, $t0, 4
+ xori $a0, 1
+ j PadRead
+ nop
+
+m_read8_misc_hwreg:
+ lui $v0, %hi(Pico+OFS_Pico_m_hardware)
+ jr $ra
+ lb $v0, %lo(Pico+OFS_Pico_m_hardware)($v0)
+
+m_read8_misc_ioports:
+ lui $v0, %hi(PicoMem+0x22000)
+ ins $v0, $t0, 0, 5
+ jr $ra
+ lb $v0, %lo(PicoMem+0x22000)($v0)
+
+m_read8_misc2:
+ lui $t0, 0xa1
+ ori $t0, 0x1100
+ bne $a0, $t0, m_read8_misc3
+ srl $t0, $a0, 16
+ j z80ReadBusReq
+
+m_read8_misc3:
+ addiu $t0, 0xff60 # expecting 0xa0 to get 0
+ bnez $t0, m_read8_misc4
+
+ # z80 area
+ andi $t0, $a0, 0x4000
+ bnez $t0, m_read8_z80_misc
+ andi $t0, $a0, 0x6000
+ j z80Read8 # z80 RAM
+
+m_read8_z80_misc:
+ addiu $t0, 0xc000 # expecting 0x4000 to get 0
+ bnez $t0, m_read_neg1 # invalid
+ nop
+ j ym2612_read_local_68k
+ nop
+
+m_read8_fake_ym2612:
+ lb $v0, %lo(Pico+OFS_Pico_m_rotate)($t0)
+ addiu $t1, $v0, 1
+ jr $ra
+ sb $t1, %lo(Pico+OFS_Pico_m_rotate)($t0)
+
+# delay slot friendly
+.macro m_read8_call16 funcname is_func_ptr=0
+.if \is_func_ptr
+ lui $t1, %hi(\funcname)
+ lw $t1, %lo(\funcname)($t1)
+.endif
+ andi $t0, $a0, 1
+ beqz $t0, 1f
+ li $a1, 8 # not always needed, but shouln't cause problems
+.if \is_func_ptr
+ jr $t1
+.else
+ j \funcname # odd address
+.endif
+ nop
+1:
+ addiu $sp, -4
+ sw $ra, 0($sp)
+.if \is_func_ptr
+ jalr $t1
+.else
+ jal \funcname
+.endif
+ xori $a0, 1
+ lw $ra, 0($sp)
+ addiu $sp, 4
+ jr $ra
+ srl $v0, 8
+.endm
+
+m_read8_misc4:
+ # if everything else fails, use generic handler
+ m_read8_call16 OtherRead16
+
+m_read8_vdp:
+ ext $t0, $a0, 16, 3
+ andi $t1, $a0, 0xe0
+ or $t0, $t1
+ bnez $t0, m_read_null # invalid address
+ nop
+ j PicoRead8_vdp
+ nop
+
+m_read8_ram:
+ lui $t0, %hi(PicoMem)
+ ins $t0, $a0, 0, 16
+ xori $t0, 1
+ jr $ra
+ lb $v0, %lo(PicoMem)($t0)
+
+m_read8_above_rom:
+ # might still be SRam (Micro Machines, HardBall '95)
+ m_read_rom_try_sram 0 8
+ m_read8_call16 PicoRead16Hook 1
+
+# #############################################################################
+
+.macro m_read16_rom sect
+ lui $t0, %hi(Pico+OFS_Pico_rom)
+ lw $t0, %lo(Pico+OFS_Pico_rom)($t0) # rom
+ ins $a0, $0, 0, 1
+ ins $a0, $0, 19, 13
+.if \sect
+ lui $t1, 8*\sect
+ addu $a0, $t1
+.endif
+ addu $t0, $a0
+ jr $ra
+ lh $v0, 0($t0)
+.endm
+
+
+m_read16_rom0: # 0x000000 - 0x07ffff
+ m_read16_rom 0
+
+m_read16_rom1: # 0x080000 - 0x0fffff
+ m_read16_rom 1
+
+m_read16_rom2: # 0x100000 - 0x17ffff
+ m_read16_rom 2
+
+m_read16_rom3: # 0x180000 - 0x1fffff
+ m_read16_rom 3
+
+m_read16_rom4: # 0x200000 - 0x27ffff, SRAM area
+ m_read_rom_try_sram 1 16
+ lw $t1, 4($t3) # romsize
+ subu $t4, $t1, $a0
+ blez $t4, m_read_null
+ lw $t1, 0($t3) # rom
+ ins $a0, $0, 0, 1
+ addu $t1, $a0
+ jr $ra
+ lh $v0, 0($t1)
+
+m_read16_rom5: # 0x280000 - 0x2fffff
+ m_read16_rom 5
+
+m_read16_rom6: # 0x300000 - 0x37ffff
+ m_read16_rom 6
+
+m_read16_rom7: # 0x380000 - 0x3fffff
+ m_read16_rom 7
+
+m_read16_rom8: # 0x400000 - 0x47ffff
+ m_read16_rom 8
+
+m_read16_rom9: # 0x480000 - 0x4fffff
+ m_read16_rom 9
+
+m_read16_romA: # 0x500000 - 0x57ffff
+ m_read16_rom 0xA
+
+m_read16_romB: # 0x580000 - 0x5fffff
+ m_read16_rom 0xB
+
+m_read16_romC: # 0x600000 - 0x67ffff
+ m_read16_rom 0xC
+
+m_read16_romD: # 0x680000 - 0x6fffff
+ m_read16_rom 0xD
+
+m_read16_romE: # 0x700000 - 0x77ffff
+ m_read16_rom 0xE
+
+m_read16_romF: # 0x780000 - 0x7fffff
+ m_read16_rom 0xF
+
+m_read16_rom10: # 0x800000 - 0x87ffff
+ m_read16_rom 0x10
+
+m_read16_rom11: # 0x880000 - 0x8fffff
+ m_read16_rom 0x11
+
+m_read16_rom12: # 0x900000 - 0x97ffff
+ m_read16_rom 0x12
+
+m_read16_rom13: # 0x980000 - 0x9fffff
+ m_read16_rom 0x13
+
+m_read16_misc:
+ ins $a0, $0, 0, 1
+ j OtherRead16
+ li $a1, 16
+
+m_read16_vdp:
+ ext $t0, $a0, 16, 3
+ andi $t1, $a0, 0xe0
+ or $t0, $t1
+ bnez $t0, m_read_null # invalid address
+ ins $a0, $0, 0, 1
+ j PicoVideoRead
+ nop
+
+m_read16_ram:
+ lui $t0, %hi(PicoMem)
+ ins $a0, $0, 0, 1
+ ins $t0, $a0, 0, 16
+ jr $ra
+ lh $v0, %lo(PicoMem)($t0)
+
+m_read16_above_rom:
+ # might still be SRam
+ m_read_rom_try_sram 0 16
+ lui $t1, %hi(PicoRead16Hook)
+ lw $t1, %lo(PicoRead16Hook)($t1)
+ jr $t1
+ ins $a0, $0, 0, 1
+
+# #############################################################################
+
+.macro m_read32_rom sect
+ lui $t0, %hi(Pico+OFS_Pico_rom)
+ lw $t0, %lo(Pico+OFS_Pico_rom)($t0) # rom
+ ins $a0, $0, 0, 1
+ ins $a0, $0, 19, 13
+.if \sect
+ lui $t1, 8*\sect
+ addu $a0, $t1
+.endif
+ addu $t0, $a0
+ lh $v1, 0($t0)
+ lh $v0, 2($t0)
+ jr $ra
+ ins $v0, $v1, 16, 16
+.endm
+
+
+m_read32_rom0: # 0x000000 - 0x07ffff
+ m_read32_rom 0
+
+m_read32_rom1: # 0x080000 - 0x0fffff
+ m_read32_rom 1
+
+m_read32_rom2: # 0x100000 - 0x17ffff
+ m_read32_rom 2
+
+m_read32_rom3: # 0x180000 - 0x1fffff
+ m_read32_rom 3
+
+m_read32_rom4: # 0x200000 - 0x27ffff, SRAM area
+ m_read_rom_try_sram 1 32
+ lw $t1, 4($t3) # romsize
+ subu $t4, $t1, $a0
+ blez $t4, m_read_null
+ lw $t1, 0($t3) # rom
+ ins $a0, $0, 0, 1
+ addu $t1, $a0
+ lh $v1, 0($t1)
+ lh $v0, 2($t1)
+ jr $ra
+ ins $v0, $v1, 16, 16
+
+m_read32_rom5: # 0x280000 - 0x2fffff
+ m_read32_rom 5
+
+m_read32_rom6: # 0x300000 - 0x37ffff
+ m_read32_rom 6
+
+m_read32_rom7: # 0x380000 - 0x3fffff
+ m_read32_rom 7
+
+m_read32_rom8: # 0x400000 - 0x47ffff
+ m_read32_rom 8
+
+m_read32_rom9: # 0x480000 - 0x4fffff
+ m_read32_rom 9
+
+m_read32_romA: # 0x500000 - 0x57ffff
+ m_read32_rom 0xA
+
+m_read32_romB: # 0x580000 - 0x5fffff
+ m_read32_rom 0xB
+
+m_read32_romC: # 0x600000 - 0x67ffff
+ m_read32_rom 0xC
+
+m_read32_romD: # 0x680000 - 0x6fffff
+ m_read32_rom 0xD
+
+m_read32_romE: # 0x700000 - 0x77ffff
+ m_read32_rom 0xE
+
+m_read32_romF: # 0x780000 - 0x7fffff
+ m_read32_rom 0xF
+
+m_read32_rom10: # 0x800000 - 0x87ffff
+ m_read32_rom 0x10
+
+m_read32_rom11: # 0x880000 - 0x8fffff
+ m_read32_rom 0x11
+
+m_read32_rom12: # 0x900000 - 0x97ffff
+ m_read32_rom 0x12
+
+m_read32_rom13: # 0x980000 - 0x9fffff
+ m_read32_rom 0x13
+
+.macro m_read32_call16 func need_a1=0
+ addiu $sp, -8
+ sw $ra, 0($sp)
+ sw $s0, 4($sp)
+.if \need_a1
+ li $a1, 16
+.endif
+ jal \func
+ move $s0, $a0
+
+ addu $a0, $s0, 2
+.if \need_a1
+ li $a1, 16
+.endif
+ jal \func
+ move $s0, $v0
+
+ ins $v0, $s0, 16, 16
+ lw $ra, 0($sp)
+ lw $s0, 4($sp)
+ jr $ra
+ addiu $sp, 8
+.endm
+
+m_read32_misc:
+ ins $a0, $0, 0, 1
+ m_read32_call16 OtherRead16, 1
+
+m_read32_vdp:
+ ext $t0, $a0, 16, 3
+ andi $t1, $a0, 0xe0
+ or $t0, $t1
+ bnez $t0, m_read_null # invalid address
+ ins $a0, $0, 0, 1
+ m_read32_call16 PicoVideoRead
+
+m_read32_ram:
+ lui $t0, %hi(PicoMem)
+ ins $a0, $0, 0, 1
+ ins $t0, $a0, 0, 16
+ lh $v1, %lo(PicoMem)($t0)
+ lh $v0, %lo(PicoMem+2)($t0)
+ jr $ra
+ ins $v0, $v1, 16, 16
+
+m_read32_above_rom:
+ # might still be SRam
+ m_read_rom_try_sram 0 32
+ ins $a0, $0, 0, 1
+ lui $t1, %hi(PicoRead16Hook)
+ lw $t1, %lo(PicoRead16Hook)($t1)
+ addiu $sp, -4*3
+ sw $ra, 0($sp)
+ sw $s0, 4($sp)
+ sw $t1, 8($sp)
+ jalr $t1
+ move $s0, $a0
+
+ lw $t1, 8($sp)
+ addu $a0, $s0, 2
+ jalr $t1
+ move $s0, $v0
+
+ ins $v0, $s0, 16, 16
+ lw $ra, 0($sp)
+ lw $s0, 4($sp)
+ jr $ra
+ addiu $sp, 4*3
+
+# #############################################################################
+
+.macro PicoWriteRomHW_SSF2_ls def_table table
+ lui $t3, %hi(\def_table)
+ ins $t3, $a1, 2, 5
+ lw $t0, %lo(\def_table)($t3)
+ lui $t2, %hi(\table)
+ ins $t2, $a0, 2, 3
+ sw $t0, %lo(\table)($t2)
+.endm
+
+PicoWriteRomHW_SSF2: # u32 a, u32 d
+ ext $a0, $a0, 1, 3
+ bnez $a0, pwr_banking
+
+ # sram register
+ lui $t0, %hi(Pico+OFS_Pico_m_sram_reg)
+ lb $t1, %lo(Pico+OFS_Pico_m_sram_reg)($t0) # Pico.m.sram_reg
+ ins $t1, $a1, 0, 2
+ jr $ra
+ sb $t1, %lo(Pico+OFS_Pico_m_sram_reg)($t0)
+
+pwr_banking:
+ andi $a1, 0x1f
+
+ PicoWriteRomHW_SSF2_ls m_read8_def_table m_read8_table
+ PicoWriteRomHW_SSF2_ls m_read16_def_table m_read16_table
+ PicoWriteRomHW_SSF2_ls m_read32_def_table m_read32_table
+
+ jr $ra
+ nop
+
+# vim:filetype=mips
notaz.gp2x.de / picodrive.git / blobdiff