[picodrive.git] / pico / cd / memory_arm.S

@*
@* Memory I/O handlers for Sega/Mega CD emulation
@* (C) notaz, 2007-2009
@*
@* This work is licensed under the terms of MAME license.
@* See COPYING file in the top-level directory.
@*

#include "../pico_int_o32.h"

.equiv PCM_STEP_SHIFT, 11

.text
.align 2

.global PicoRead8_mcd_io
.global PicoRead16_mcd_io
.global PicoWrite8_mcd_io
.global PicoWrite16_mcd_io

.global PicoReadS68k8_pr
.global PicoReadS68k16_pr
.global PicoWriteS68k8_pr
.global PicoWriteS68k16_pr

.global PicoReadM68k8_cell0
.global PicoReadM68k8_cell1
.global PicoReadM68k16_cell0
.global PicoReadM68k16_cell1
.global PicoWriteM68k8_cell0
.global PicoWriteM68k8_cell1
.global PicoWriteM68k16_cell0
.global PicoWriteM68k16_cell1

.global PicoReadS68k8_dec0
.global PicoReadS68k8_dec1
.global PicoReadS68k16_dec0
.global PicoReadS68k16_dec1
.global PicoWriteS68k8_dec_m0b0
.global PicoWriteS68k8_dec_m1b0
.global PicoWriteS68k8_dec_m2b0
.global PicoWriteS68k8_dec_m0b1
.global PicoWriteS68k8_dec_m1b1
.global PicoWriteS68k8_dec_m2b1
.global PicoWriteS68k16_dec_m0b0
.global PicoWriteS68k16_dec_m1b0
.global PicoWriteS68k16_dec_m2b0
.global PicoWriteS68k16_dec_m0b1
.global PicoWriteS68k16_dec_m1b1
.global PicoWriteS68k16_dec_m2b1

@ externs, just for reference
.extern Pico
.extern cdc_host_r
.extern m68k_reg_write8
.extern s68k_reg_read16
.extern s68k_reg_write8
.extern s68k_reg_write16
.extern s68k_poll_detect
.extern pcd_pcm_write
.extern pcd_pcm_read
.extern PicoRead8_io
.extern PicoRead16_io
.extern PicoWrite8_io
.extern PicoWrite16_io
.extern m68k_comm_check


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@ utilities

@ r0=addr[in,out], r1,r2=tmp
.macro cell_map
    ands    r1, r0, #0x01c000
    ldrne   pc, [pc, r1, lsr #12]
    beq     0f                          @ most common?
    .long   0f
    .long   0f
    .long   0f
    .long   0f
    .long   1f
    .long   1f
    .long   2f
    .long   3f
1: @ x16 cells
    and     r1, r0, #0x7e00             @ col
    and     r2, r0, #0x01fc             @ row
    orr     r2, r2, #0x0400
    orr     r1, r2, r1, ror #13
    b       9f
2: @ x8 cells
    and     r1, r0, #0x3f00             @ col
    and     r2, r0, #0x00fc             @ row
    orr     r2, r2, #0x0600
    orr     r1, r2, r1, ror #12
    b       9f
3: @ x4 cells
    and     r1, r0, #0x1f80             @ col
    and     r2, r0, #0x007c             @ row
    orr     r1, r2, r1, ror #11
    and     r2, r0,#0x1e000
    orr     r1, r1, r2, lsr #6
    b       9f
0: @ x32 cells
    and     r1, r0, #0xfc00             @ col
    and     r2, r0, #0x03fc             @ row
    orr     r1, r2, r1, ror #14
9:
    and     r0, r0, #3
    orr     r0, r0, r1, ror #26         @ rol 4+2
.endm


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


m_read_null:
    mov     r0, #0
    bx      lr


PicoReadM68k8_cell0:                    @ 0x220000 - 0x23ffff, cell arranged
    mov     r3, #0x0c0000
    b       0f

PicoReadM68k8_cell1:                    @ 0x220000 - 0x23ffff, cell arranged
    mov     r3, #0x0e0000
0:
    cell_map
    ldr     r1, =Pico
    add     r0, r0, r3
    ldr     r1, [r1, #OFS_Pico_rom]   @ Pico.mcd (used everywhere)
    eor     r0, r0, #1
    ldrb    r0, [r1, r0]
    bx      lr


PicoRead8_mcd_io:
    and     r1, r0, #0xff00
    cmp     r1, #0x2000	              @ a120xx?
    bne     PicoRead8_io

    ldr     r1, =Pico
    and     r0, r0, #0x3f
    ldr     r1, [r1, #OFS_Pico_rom]   @ Pico.mcd
    cmp     r0, #0x0e
    ldrlt   pc, [pc, r0, lsl #2]
    b       m_m68k_read8_hi
    .long   m_m68k_read8_r00
    .long   m_m68k_read8_r01
    .long   m_m68k_read8_r02
    .long   m_m68k_read8_r03
    .long   m_m68k_read8_r04
    .long   m_read_null               @ unused bits
    .long   m_m68k_read8_r06
    .long   m_m68k_read8_r07
    .long   m_m68k_read8_r08
    .long   m_m68k_read8_r09
    .long   m_read_null               @ reserved
    .long   m_read_null
    .long   m_m68k_read8_r0c
    .long   m_m68k_read8_r0d
m_m68k_read8_r00:
    add     r1, r1, #0x110000
    ldr     r0, [r1, #0x30]
    and     r0, r0, #0x04000000       @ we need irq2 mask state
    mov     r0, r0, lsr #19
    bx      lr
m_m68k_read8_r01:
    add     r1, r1, #0x110000
    add     r1, r1, #0x002200
    ldrb    r0, [r1, #2]              @ Pico_mcd->m.busreq
    bx      lr
m_m68k_read8_r02:
    add     r1, r1, #0x110000
    ldrb    r0, [r1, #2]
    bx      lr
m_m68k_read8_r03:
    add     r1, r1, #0x110000
    push    {r1, lr}
    bl      m68k_comm_check
    pop     {r1, lr}
    ldrb    r0, [r1, #3]
    and     r0, r0, #0xc7
    bx      lr
m_m68k_read8_r04:
    add     r1, r1, #0x110000
    ldrb    r0, [r1, #4]
    bx      lr
m_m68k_read8_r06:
    ldrb    r0, [r1, #0x73]           @ IRQ vector
    bx      lr
m_m68k_read8_r07:
    ldrb    r0, [r1, #0x72]
    bx      lr
m_m68k_read8_r08:
    mov     r0, #0
    bl      cdc_host_r
    mov     r0, r0, lsr #8
    bx      lr
m_m68k_read8_r09:
    mov     r0, #0
    b       cdc_host_r
m_m68k_read8_r0c:
    add     r1, r1, #0x110000
    add     r1, r1, #0x002200
    ldr     r0, [r1, #0x14]           @ Pico_mcd->m.timer_stopwatch
    mov     r0, r0, lsr #24
    bx      lr
m_m68k_read8_r0d:
    add     r1, r1, #0x110000
    add     r1, r1, #0x002200
    ldr     r0, [r1, #0x14]
    mov     r0, r0, lsr #16
    bx      lr
m_m68k_read8_hi:
    cmp     r0, #0x30
    add     r1, r1, #0x110000
    movge   r0, #0
    bxge    lr
    add     r1, r0
    push    {r1, lr}
    bl      m68k_comm_check
    pop     {r1, lr}
    ldrb    r0, [r1]
    bx      lr


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


PicoReadM68k16_cell0:                   @ 0x220000 - 0x23ffff, cell arranged
    mov     r3, #0x0c0000
    b       0f

PicoReadM68k16_cell1:                   @ 0x220000 - 0x23ffff, cell arranged
    mov     r3, #0x0e0000
0:
    cell_map
    ldr     r1, =Pico
    add     r0, r0, r3
    ldr     r1, [r1, #OFS_Pico_rom]   @ Pico.mcd
    bic     r0, r0, #1
    ldrh    r0, [r1, r0]
    bx      lr


PicoRead16_mcd_io:
    and     r1, r0, #0xff00
    cmp     r1, #0x2000	              @ a120xx
    bne     PicoRead16_io

m_m68k_read16_m68k_regs:
    ldr     r1, =Pico
    and     r0, r0, #0x3e
    ldr     r1, [r1, #OFS_Pico_rom]   @ Pico.mcd
    cmp     r0, #0x0e
    ldrlt   pc, [pc, r0, lsl #1]
    b       m_m68k_read16_hi
    .long   m_m68k_read16_r00
    .long   m_m68k_read16_r02
    .long   m_m68k_read16_r04
    .long   m_m68k_read16_r06
    .long   m_m68k_read16_r08
    .long   m_read_null               @ reserved
    .long   m_m68k_read16_r0c
m_m68k_read16_r00:
    add     r1, r1, #0x110000
    ldr     r0, [r1, #0x30]
    add     r1, r1, #0x002200
    ldrb    r1, [r1, #2]              @ Pico_mcd->m.busreq
    and     r0, r0, #0x04000000       @ we need irq2 mask state
    orr     r0, r1, r0, lsr #11
    bx      lr
m_m68k_read16_r02:
    add     r1, r1, #0x110000
    push    {r1, lr}
    bl      m68k_comm_check
    pop     {r1, lr}
    ldrb    r2, [r1, #3]
    ldrb    r0, [r1, #2]
    and     r2, r2, #0xc7
    orr     r0, r2, r0, lsl #8
    bx      lr
m_m68k_read16_r04:
    add     r1, r1, #0x110000
    ldrb    r0, [r1, #4]
    mov     r0, r0, lsl #8
    bx      lr
m_m68k_read16_r06:
    ldrh    r0, [r1, #0x72]           @ IRQ vector
    bx      lr
m_m68k_read16_r08:
    mov     r0, #0
    b       cdc_host_r
m_m68k_read16_r0c:
    add     r1, r1, #0x110000
    add     r1, r1, #0x002200
    ldr     r0, [r1, #0x14]
    mov     r0, r0, lsr #16
    bx      lr
m_m68k_read16_hi:
    cmp     r0, #0x30
    add     r1, r1, #0x110000
    movge   r0, #0
    bxge    lr

    add     r1, r0, r1
    push    {r1, lr}
    bl      m68k_comm_check
    pop     {r0, lr}
    ldrh    r0, [r0]
    mov     r1, r0, lsr #8
    and     r0, r0, #0xff
    orr     r0, r1, r0, lsl #8
    bx      lr


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


PicoWriteM68k8_cell0:                   @ 0x220000 - 0x23ffff, cell arranged
    mov     r12,#0x0c0000
    b       0f

PicoWriteM68k8_cell1:                   @ 0x220000 - 0x23ffff, cell arranged
    mov     r12,#0x0e0000
0:
    mov     r3, r1
    cell_map
    ldr     r2, =Pico
    add     r0, r0, r12
    ldr     r2, [r2, #OFS_Pico_rom]     @ Pico.mcd
    ldr     r2, [r2]
    eor     r0, r0, #1
    strb    r3, [r2, r0]
    bx      lr


PicoWrite8_mcd_io:
    and     r2, r0, #0xff00
    cmp     r2, #0x2000                 @ a120xx?
    beq     m68k_reg_write8
    b       PicoWrite8_io


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


PicoWriteM68k16_cell0:                   @ 0x220000 - 0x23ffff, cell arranged
    mov     r12, #0x0c0000
    b       0f

PicoWriteM68k16_cell1:                   @ 0x220000 - 0x23ffff, cell arranged
    mov     r12, #0x0e0000
0:
    mov     r3, r1
    cell_map
    ldr     r1, =Pico
    add     r0, r0, r12
    ldr     r1, [r1, #OFS_Pico_rom]     @ Pico.mcd
    bic     r0, r0, #1
    strh    r3, [r1, r0]
    bx      lr


PicoWrite16_mcd_io:
    and     r2, r0, #0xff00
    cmp     r2, #0x2000                 @ a120xx?
    bne     PicoWrite16_io

m_m68k_write16_regs:
    and     r0, r0, #0x3e
    cmp     r0, #0x0e
    beq     m_m68k_write16_regs_spec
    and     r3, r1, #0xff
    add     r2, r0, #1
    stmfd   sp!,{r2,r3,lr}
    mov     r1, r1, lsr #8
    bl      m68k_reg_write8
    ldmfd   sp!,{r0,r1,lr}
    b       m68k_reg_write8

m_m68k_write16_regs_spec:               @ special case
    mov     r1, r1, lsr #8
    b       m68k_reg_write8


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@                                   Sub 68k
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


PicoReadS68k8_dec0:                     @ 0x080000 - 0x0bffff
    mov     r3, #0x080000               @ + ^ / 2
    b       0f

PicoReadS68k8_dec1:
    mov     r3, #0x0a0000               @ + ^ / 2
0:
    ldr     r2, =Pico
    eor     r0, r0, #2
    ldr     r2, [r2, #OFS_Pico_rom]     @ Pico.mcd
    movs    r0, r0, lsr #1              @ +4-6 <<16
    add     r2, r2, r3                  @ map to our address
    ldrb    r0, [r2, r0]
    movcc   r0, r0, lsr #4
    andcs   r0, r0, #0xf
    bx      lr


PicoReadS68k8_pr:
    and     r2, r0, #0xfe00
    cmp     r2, #0x8000
    bne     m_s68k_read8_pcm

m_s68k_read8_regs:
    bic     r0, r0, #0xff0000
    bic     r0, r0, #0x008000
    sub     r2, r0, #0x0e
    cmp     r2, #(0x30-0x0e)
    blo     m_s68k_read8_comm
    stmfd   sp!,{r0,lr}
    bic     r0, r0, #1
    bl      s68k_reg_read16
    ldmfd   sp!,{r1,lr}
    tst     r1, #1
    moveq   r0, r0, lsr #8
    and     r0, r0, #0xff
    bx      lr

m_s68k_read8_comm:
    ldr     r1, =Pico
    ldr     r1, [r1, #OFS_Pico_rom]     @ Pico.mcd
    add     r1, r1, #0x110000
    ldrb    r1, [r1, r0]
    bic     r0, r0, #1
    b       s68k_poll_detect


m_s68k_read8_pcm:
    tst     r0, #0x8000
    bne     m_read_null

    @ must not trash r3 and r12
    ldr     r1, =Pico
    bic     r0, r0, #0xff0000
    ldr     r1, [r1, #OFS_Pico_rom]     @ Pico.mcd
    mov     r2, #0x110000
    orr     r2, r2, #0x002200
    cmp     r0, #0x2000
    bge     m_s68k_read8_pcm_ram
    cmp     r0, #0x20
    movge   r0, r0, lsr #1
    bge     pcd_pcm_read
    mov     r0, #0
    bx      lr

m_s68k_read8_pcm_ram:
    orr     r2, r2, #0x40
    ldr     r2, [r1, r2]
    add     r1, r1, #0x100000           @ pcm_ram
    and     r2, r2, #0x0f000000         @ bank
    add     r1, r1, r2, lsr #12
    bic     r0, r0, #0x00e000
    mov     r0, r0, lsr #1
    ldrb    r0, [r1, r0]
    bx      lr


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


PicoReadS68k16_dec0:                    @ 0x080000 - 0x0bffff
    mov     r3, #0x080000               @ + ^ / 2
    b       0f

PicoReadS68k16_dec1:
    mov     r3, #0x0a0000               @ + ^ / 2
0:
    ldr     r2, =Pico
    eor     r0, r0, #2
    ldr     r2, [r2, #OFS_Pico_rom]     @ Pico.mcd
    mov     r0, r0, lsr #1              @ +4-6 <<16
    add     r2, r2, r3                  @ map to our address
    ldrb    r0, [r2, r0]
    orr     r0, r0, r0, lsl #4
    bic     r0, r0, #0xf0
    bx      lr


PicoReadS68k16_pr:
    and     r2, r0, #0xfe00
    cmp     r2, #0x8000
    @ pcm is on 8-bit bus, would this be same as byte access?
    bne     m_s68k_read8_pcm

m_s68k_read16_regs:
    bic     r0, r0, #0xff0000
    bic     r0, r0, #0x008000
    bic     r0, r0, #0x000001
    cmp     r0, #8
    bne     s68k_reg_read16
    mov     r0, #1
    b       cdc_host_r


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


.macro m_s68k_write8_2M_decode
    ldr     r2, =Pico
    eor     r0, r0, #2
    ldr     r2, [r2, #OFS_Pico_rom]     @ Pico.mcd
    movs    r0, r0, lsr #1              @ +4-6 <<16
    add     r2, r2, r3                  @ map to our address
.endm

PicoWriteS68k8_dec_m2b0:                @ overwrite
    ands    r1, r1, #0x0f
    bxeq    lr

PicoWriteS68k8_dec_m0b0:
    mov     r3, #0x080000
    b       0f

PicoWriteS68k8_dec_m2b1:                @ overwrite
    ands    r1, r1, #0x0f
    bxeq    lr

PicoWriteS68k8_dec_m0b1:
    mov     r3, #0x0a0000
0:
    m_s68k_write8_2M_decode
    ldrb    r0, [r2, r0]!
    and     r1, r1, #0x0f
    movcc   r1, r1, lsl #4
    andcc   r3, r0, #0x0f
    andcs   r3, r0, #0xf0
    orr     r3, r3, r1
    strneb  r3, [r2]
    bx      lr

PicoWriteS68k8_dec_m1b0:                @ underwrite
    mov     r3, #0x080000
    b       0f

PicoWriteS68k8_dec_m1b1:
    mov     r3, #0x0a0000
0:
    ands    r1, r1, #0x0f
    bxeq    lr
    m_s68k_write8_2M_decode
    ldrb    r0, [r2, r0]!
    movcc   r1, r1, lsl #4
    andcc   r3, r0, #0x0f
    andcs   r3, r0, #0xf0
    teq     r3, r0
    bxne    lr
    orr     r3, r3, r1
    strneb  r3, [r2]
    bx      lr


PicoWriteS68k8_pr:
    and     r2, r0, #0xfe00
    cmp     r2, #0x8000
    bne     m_s68k_write8_pcm

m_s68k_write8_regs:
    bic     r0, r0, #0xff0000
    bic     r0, r0, #0x008000
    tst     r0, #0x7e00
    movne   r0, #0
    bxne    lr
    sub     r2, r0, #0x59
    cmp     r2, #0x0f
    bhs     s68k_reg_write8
    bic     r0, r0, #1
    orr     r1, r1, r1, lsl #8
    b       s68k_reg_write16


m_s68k_write8_pcm:
    tst     r0, #0x8000
    bxne    lr
    bic     r0, r0, #0xff0000
    cmp     r0, #0x12
    movlt   r0, r0, lsr #1
    blt     pcd_pcm_write

    cmp     r0, #0x2000
    bxlt    lr

m_s68k_write8_pcm_ram:
    ldr     r3, =Pico
    bic     r0, r0, #0x00e000
    ldr     r3, [r3, #OFS_Pico_rom]     @ Pico.mcd
    mov     r0, r0, lsr #1
    add     r2, r3, #0x110000
    add     r2, r2, #0x002200
    add     r2, r2, #0x000040
    ldr     r2, [r2]
    add     r3, r3, #0x100000           @ pcm_ram
    and     r2, r2, #0x0f000000         @ bank
    add     r3, r3, r2, lsr #12
    strb    r1, [r3, r0]
    bx      lr


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


.macro m_s68k_write16_2M_decode
    ldr     r2, =Pico
    eor     r0, r0, #2
    ldr     r2, [r2, #OFS_Pico_rom]     @ Pico.mcd
    mov     r0, r0, lsr #1              @ +4-6 <<16
    add     r2, r2, r3                  @ map to our address
.endm

PicoWriteS68k16_dec_m0b0:
    mov     r3, #0x080000
    b       0f

PicoWriteS68k16_dec_m0b1:
    mov     r3, #0x0a0000
0:
    m_s68k_write16_2M_decode
    bic     r1, r1, #0xf0
    orr     r1, r1, r1, lsr #4
    strb    r1, [r2, r0]
    bx      lr

PicoWriteS68k16_dec_m1b0:               @ underwrite
    mov     r3, #0x080000
    b       0f

PicoWriteS68k16_dec_m1b1:
    mov     r3, #0x0a0000
0:
    bics    r1, r1, #0xf000
    bicnes  r1, r1, #0x00f0
    bxeq    lr
    orr     r1, r1, r1, lsr #4
    m_s68k_write16_2M_decode
    ldrb    r0, [r2, r0]!
    and     r3, r1, #0x0f
    and     r1, r1, #0xf0
    tst     r0, #0x0f
    orreq   r0, r0, r3
    tst     r0, #0xf0
    orreq   r0, r0, r1
    strb    r0, [r2]
    bx      lr

PicoWriteS68k16_dec_m2b0:               @ overwrite
    mov     r3, #0x080000
    b       0f

PicoWriteS68k16_dec_m2b1:
    mov     r3, #0x0a0000
0:
    bics    r1, r1, #0xf000
    bicnes  r1, r1, #0x00f0
    bxeq    lr
    orr     r1, r1, r1, lsr #4
    m_s68k_write16_2M_decode
    ldrb    r0, [r2, r0]!
    ands    r3, r1, #0x0f
    andne   r0, r0, #0xf0
    orrne   r0, r0, r3
    ands    r1, r1, #0xf0
    andne   r0, r0, #0x0f
    orrne   r0, r0, r1
    strb    r0, [r2]
    bx      lr


PicoWriteS68k16_pr:
    and     r2, r0, #0xfe00
    cmp     r2, #0x8000
    bne     m_s68k_write8_pcm

m_s68k_write16_regs:
    bic     r0, r0, #0xff0000
    bic     r0, r0, #0x008000
    bic     r0, r0, #1
    tst     r0, #0x7e00
    movne   r0, #0
    bxne    lr
    cmp     r0, #0x0e
    bne     s68k_reg_write16

m_s68k_write16_regs_spec:               @ special case
    ldr     r2, =Pico
    mov     r0, #0x110000
    ldr     r2, [r2, #OFS_Pico_rom]     @ Pico.mcd
    add     r0, r0, #0x00000f
    strb    r1, [r2, r0]                @ if (a == 0xe) s68k_regs[0xf] = d;
    bx      lr

.pool

@ vim:filetype=armasm
Commit	Line	Data
	1	@*
	2	@* Memory I/O handlers for Sega/Mega CD emulation
	3	@* (C) notaz, 2007-2009
	4	@*
	5	@* This work is licensed under the terms of MAME license.
	6	@* See COPYING file in the top-level directory.
	7	@*
	8
	9	#include "../pico_int_o32.h"
	10
	11	.equiv PCM_STEP_SHIFT, 11
	12
	13	.text
	14	.align 2
	15
	16	.global PicoRead8_mcd_io
	17	.global PicoRead16_mcd_io
	18	.global PicoWrite8_mcd_io
	19	.global PicoWrite16_mcd_io
	20
	21	.global PicoReadS68k8_pr
	22	.global PicoReadS68k16_pr
	23	.global PicoWriteS68k8_pr
	24	.global PicoWriteS68k16_pr
	25
	26	.global PicoReadM68k8_cell0
	27	.global PicoReadM68k8_cell1
	28	.global PicoReadM68k16_cell0
	29	.global PicoReadM68k16_cell1
	30	.global PicoWriteM68k8_cell0
	31	.global PicoWriteM68k8_cell1
	32	.global PicoWriteM68k16_cell0
	33	.global PicoWriteM68k16_cell1
	34
	35	.global PicoReadS68k8_dec0
	36	.global PicoReadS68k8_dec1
	37	.global PicoReadS68k16_dec0
	38	.global PicoReadS68k16_dec1
	39	.global PicoWriteS68k8_dec_m0b0
	40	.global PicoWriteS68k8_dec_m1b0
	41	.global PicoWriteS68k8_dec_m2b0
	42	.global PicoWriteS68k8_dec_m0b1
	43	.global PicoWriteS68k8_dec_m1b1
	44	.global PicoWriteS68k8_dec_m2b1
	45	.global PicoWriteS68k16_dec_m0b0
	46	.global PicoWriteS68k16_dec_m1b0
	47	.global PicoWriteS68k16_dec_m2b0
	48	.global PicoWriteS68k16_dec_m0b1
	49	.global PicoWriteS68k16_dec_m1b1
	50	.global PicoWriteS68k16_dec_m2b1
	51
	52	@ externs, just for reference
	53	.extern Pico
	54	.extern cdc_host_r
	55	.extern m68k_reg_write8
	56	.extern s68k_reg_read16
	57	.extern s68k_reg_write8
	58	.extern s68k_reg_write16
	59	.extern s68k_poll_detect
	60	.extern pcd_pcm_write
	61	.extern pcd_pcm_read
	62	.extern PicoRead8_io
	63	.extern PicoRead16_io
	64	.extern PicoWrite8_io
	65	.extern PicoWrite16_io
	66	.extern m68k_comm_check
	67
	68
	69	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	70
	71	@ utilities
	72
	73	@ r0=addr[in,out], r1,r2=tmp
	74	.macro cell_map
	75	ands r1, r0, #0x01c000
	76	ldrne pc, [pc, r1, lsr #12]
	77	beq 0f @ most common?
	78	.long 0f
	79	.long 0f
	80	.long 0f
	81	.long 0f
	82	.long 1f
	83	.long 1f
	84	.long 2f
	85	.long 3f
	86	1: @ x16 cells
	87	and r1, r0, #0x7e00 @ col
	88	and r2, r0, #0x01fc @ row
	89	orr r2, r2, #0x0400
	90	orr r1, r2, r1, ror #13
	91	b 9f
	92	2: @ x8 cells
	93	and r1, r0, #0x3f00 @ col
	94	and r2, r0, #0x00fc @ row
	95	orr r2, r2, #0x0600
	96	orr r1, r2, r1, ror #12
	97	b 9f
	98	3: @ x4 cells
	99	and r1, r0, #0x1f80 @ col
	100	and r2, r0, #0x007c @ row
	101	orr r1, r2, r1, ror #11
	102	and r2, r0,#0x1e000
	103	orr r1, r1, r2, lsr #6
	104	b 9f
	105	0: @ x32 cells
	106	and r1, r0, #0xfc00 @ col
	107	and r2, r0, #0x03fc @ row
	108	orr r1, r2, r1, ror #14
	109	9:
	110	and r0, r0, #3
	111	orr r0, r0, r1, ror #26 @ rol 4+2
	112	.endm
	113
	114
	115	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	116
	117
	118	m_read_null:
	119	mov r0, #0
	120	bx lr
	121
	122
	123	PicoReadM68k8_cell0: @ 0x220000 - 0x23ffff, cell arranged
	124	mov r3, #0x0c0000
	125	b 0f
	126
	127	PicoReadM68k8_cell1: @ 0x220000 - 0x23ffff, cell arranged
	128	mov r3, #0x0e0000
	129	0:
	130	cell_map
	131	ldr r1, =Pico
	132	add r0, r0, r3
	133	ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd (used everywhere)
	134	eor r0, r0, #1
	135	ldrb r0, [r1, r0]
	136	bx lr
	137
	138
	139	PicoRead8_mcd_io:
	140	and r1, r0, #0xff00
	141	cmp r1, #0x2000 @ a120xx?
	142	bne PicoRead8_io
	143
	144	ldr r1, =Pico
	145	and r0, r0, #0x3f
	146	ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd
	147	cmp r0, #0x0e
	148	ldrlt pc, [pc, r0, lsl #2]
	149	b m_m68k_read8_hi
	150	.long m_m68k_read8_r00
	151	.long m_m68k_read8_r01
	152	.long m_m68k_read8_r02
	153	.long m_m68k_read8_r03
	154	.long m_m68k_read8_r04
	155	.long m_read_null @ unused bits
	156	.long m_m68k_read8_r06
	157	.long m_m68k_read8_r07
	158	.long m_m68k_read8_r08
	159	.long m_m68k_read8_r09
	160	.long m_read_null @ reserved
	161	.long m_read_null
	162	.long m_m68k_read8_r0c
	163	.long m_m68k_read8_r0d
	164	m_m68k_read8_r00:
	165	add r1, r1, #0x110000
	166	ldr r0, [r1, #0x30]
	167	and r0, r0, #0x04000000 @ we need irq2 mask state
	168	mov r0, r0, lsr #19
	169	bx lr
	170	m_m68k_read8_r01:
	171	add r1, r1, #0x110000
	172	add r1, r1, #0x002200
	173	ldrb r0, [r1, #2] @ Pico_mcd->m.busreq
	174	bx lr
	175	m_m68k_read8_r02:
	176	add r1, r1, #0x110000
	177	ldrb r0, [r1, #2]
	178	bx lr
	179	m_m68k_read8_r03:
	180	add r1, r1, #0x110000
	181	push {r1, lr}
	182	bl m68k_comm_check
	183	pop {r1, lr}
	184	ldrb r0, [r1, #3]
	185	and r0, r0, #0xc7
	186	bx lr
	187	m_m68k_read8_r04:
	188	add r1, r1, #0x110000
	189	ldrb r0, [r1, #4]
	190	bx lr
	191	m_m68k_read8_r06:
	192	ldrb r0, [r1, #0x73] @ IRQ vector
	193	bx lr
	194	m_m68k_read8_r07:
	195	ldrb r0, [r1, #0x72]
	196	bx lr
	197	m_m68k_read8_r08:
	198	mov r0, #0
	199	bl cdc_host_r
	200	mov r0, r0, lsr #8
	201	bx lr
	202	m_m68k_read8_r09:
	203	mov r0, #0
	204	b cdc_host_r
	205	m_m68k_read8_r0c:
	206	add r1, r1, #0x110000
	207	add r1, r1, #0x002200
	208	ldr r0, [r1, #0x14] @ Pico_mcd->m.timer_stopwatch
	209	mov r0, r0, lsr #24
	210	bx lr
	211	m_m68k_read8_r0d:
	212	add r1, r1, #0x110000
	213	add r1, r1, #0x002200
	214	ldr r0, [r1, #0x14]
	215	mov r0, r0, lsr #16
	216	bx lr
	217	m_m68k_read8_hi:
	218	cmp r0, #0x30
	219	add r1, r1, #0x110000
	220	movge r0, #0
	221	bxge lr
	222	add r1, r0
	223	push {r1, lr}
	224	bl m68k_comm_check
	225	pop {r1, lr}
	226	ldrb r0, [r1]
	227	bx lr
	228
	229
	230	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	231
	232
	233	PicoReadM68k16_cell0: @ 0x220000 - 0x23ffff, cell arranged
	234	mov r3, #0x0c0000
	235	b 0f
	236
	237	PicoReadM68k16_cell1: @ 0x220000 - 0x23ffff, cell arranged
	238	mov r3, #0x0e0000
	239	0:
	240	cell_map
	241	ldr r1, =Pico
	242	add r0, r0, r3
	243	ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd
	244	bic r0, r0, #1
	245	ldrh r0, [r1, r0]
	246	bx lr
	247
	248
	249	PicoRead16_mcd_io:
	250	and r1, r0, #0xff00
	251	cmp r1, #0x2000 @ a120xx
	252	bne PicoRead16_io
	253
	254	m_m68k_read16_m68k_regs:
	255	ldr r1, =Pico
	256	and r0, r0, #0x3e
	257	ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd
	258	cmp r0, #0x0e
	259	ldrlt pc, [pc, r0, lsl #1]
	260	b m_m68k_read16_hi
	261	.long m_m68k_read16_r00
	262	.long m_m68k_read16_r02
	263	.long m_m68k_read16_r04
	264	.long m_m68k_read16_r06
	265	.long m_m68k_read16_r08
	266	.long m_read_null @ reserved
	267	.long m_m68k_read16_r0c
	268	m_m68k_read16_r00:
	269	add r1, r1, #0x110000
	270	ldr r0, [r1, #0x30]
	271	add r1, r1, #0x002200
	272	ldrb r1, [r1, #2] @ Pico_mcd->m.busreq
	273	and r0, r0, #0x04000000 @ we need irq2 mask state
	274	orr r0, r1, r0, lsr #11
	275	bx lr
	276	m_m68k_read16_r02:
	277	add r1, r1, #0x110000
	278	push {r1, lr}
	279	bl m68k_comm_check
	280	pop {r1, lr}
	281	ldrb r2, [r1, #3]
	282	ldrb r0, [r1, #2]
	283	and r2, r2, #0xc7
	284	orr r0, r2, r0, lsl #8
	285	bx lr
	286	m_m68k_read16_r04:
	287	add r1, r1, #0x110000
	288	ldrb r0, [r1, #4]
	289	mov r0, r0, lsl #8
	290	bx lr
	291	m_m68k_read16_r06:
	292	ldrh r0, [r1, #0x72] @ IRQ vector
	293	bx lr
	294	m_m68k_read16_r08:
	295	mov r0, #0
	296	b cdc_host_r
	297	m_m68k_read16_r0c:
	298	add r1, r1, #0x110000
	299	add r1, r1, #0x002200
	300	ldr r0, [r1, #0x14]
	301	mov r0, r0, lsr #16
	302	bx lr
	303	m_m68k_read16_hi:
	304	cmp r0, #0x30
	305	add r1, r1, #0x110000
	306	movge r0, #0
	307	bxge lr
	308
	309	add r1, r0, r1
	310	push {r1, lr}
	311	bl m68k_comm_check
	312	pop {r0, lr}
	313	ldrh r0, [r0]
	314	mov r1, r0, lsr #8
	315	and r0, r0, #0xff
	316	orr r0, r1, r0, lsl #8
	317	bx lr
	318
	319
	320	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	321
	322
	323	PicoWriteM68k8_cell0: @ 0x220000 - 0x23ffff, cell arranged
	324	mov r12,#0x0c0000
	325	b 0f
	326
	327	PicoWriteM68k8_cell1: @ 0x220000 - 0x23ffff, cell arranged
	328	mov r12,#0x0e0000
	329	0:
	330	mov r3, r1
	331	cell_map
	332	ldr r2, =Pico
	333	add r0, r0, r12
	334	ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd
	335	ldr r2, [r2]
	336	eor r0, r0, #1
	337	strb r3, [r2, r0]
	338	bx lr
	339
	340
	341	PicoWrite8_mcd_io:
	342	and r2, r0, #0xff00
	343	cmp r2, #0x2000 @ a120xx?
	344	beq m68k_reg_write8
	345	b PicoWrite8_io
	346
	347
	348	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	349
	350
	351	PicoWriteM68k16_cell0: @ 0x220000 - 0x23ffff, cell arranged
	352	mov r12, #0x0c0000
	353	b 0f
	354
	355	PicoWriteM68k16_cell1: @ 0x220000 - 0x23ffff, cell arranged
	356	mov r12, #0x0e0000
	357	0:
	358	mov r3, r1
	359	cell_map
	360	ldr r1, =Pico
	361	add r0, r0, r12
	362	ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd
	363	bic r0, r0, #1
	364	strh r3, [r1, r0]
	365	bx lr
	366
	367
	368	PicoWrite16_mcd_io:
	369	and r2, r0, #0xff00
	370	cmp r2, #0x2000 @ a120xx?
	371	bne PicoWrite16_io
	372
	373	m_m68k_write16_regs:
	374	and r0, r0, #0x3e
	375	cmp r0, #0x0e
	376	beq m_m68k_write16_regs_spec
	377	and r3, r1, #0xff
	378	add r2, r0, #1
	379	stmfd sp!,{r2,r3,lr}
	380	mov r1, r1, lsr #8
	381	bl m68k_reg_write8
	382	ldmfd sp!,{r0,r1,lr}
	383	b m68k_reg_write8
	384
	385	m_m68k_write16_regs_spec: @ special case
	386	mov r1, r1, lsr #8
	387	b m68k_reg_write8
	388
	389
	390	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	391	@ Sub 68k
	392	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	393
	394
	395	PicoReadS68k8_dec0: @ 0x080000 - 0x0bffff
	396	mov r3, #0x080000 @ + ^ / 2
	397	b 0f
	398
	399	PicoReadS68k8_dec1:
	400	mov r3, #0x0a0000 @ + ^ / 2
	401	0:
	402	ldr r2, =Pico
	403	eor r0, r0, #2
	404	ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd
	405	movs r0, r0, lsr #1 @ +4-6 <<16
	406	add r2, r2, r3 @ map to our address
	407	ldrb r0, [r2, r0]
	408	movcc r0, r0, lsr #4
	409	andcs r0, r0, #0xf
	410	bx lr
	411
	412
	413	PicoReadS68k8_pr:
	414	and r2, r0, #0xfe00
	415	cmp r2, #0x8000
	416	bne m_s68k_read8_pcm
	417
	418	m_s68k_read8_regs:
	419	bic r0, r0, #0xff0000
	420	bic r0, r0, #0x008000
	421	sub r2, r0, #0x0e
	422	cmp r2, #(0x30-0x0e)
	423	blo m_s68k_read8_comm
	424	stmfd sp!,{r0,lr}
	425	bic r0, r0, #1
	426	bl s68k_reg_read16
	427	ldmfd sp!,{r1,lr}
	428	tst r1, #1
	429	moveq r0, r0, lsr #8
	430	and r0, r0, #0xff
	431	bx lr
	432
	433	m_s68k_read8_comm:
	434	ldr r1, =Pico
	435	ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd
	436	add r1, r1, #0x110000
	437	ldrb r1, [r1, r0]
	438	bic r0, r0, #1
	439	b s68k_poll_detect
	440
	441
	442	m_s68k_read8_pcm:
	443	tst r0, #0x8000
	444	bne m_read_null
	445
	446	@ must not trash r3 and r12
	447	ldr r1, =Pico
	448	bic r0, r0, #0xff0000
	449	ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd
	450	mov r2, #0x110000
	451	orr r2, r2, #0x002200
	452	cmp r0, #0x2000
	453	bge m_s68k_read8_pcm_ram
	454	cmp r0, #0x20
	455	movge r0, r0, lsr #1
	456	bge pcd_pcm_read
	457	mov r0, #0
	458	bx lr
	459
	460	m_s68k_read8_pcm_ram:
	461	orr r2, r2, #0x40
	462	ldr r2, [r1, r2]
	463	add r1, r1, #0x100000 @ pcm_ram
	464	and r2, r2, #0x0f000000 @ bank
	465	add r1, r1, r2, lsr #12
	466	bic r0, r0, #0x00e000
	467	mov r0, r0, lsr #1
	468	ldrb r0, [r1, r0]
	469	bx lr
	470
	471
	472	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	473
	474
	475	PicoReadS68k16_dec0: @ 0x080000 - 0x0bffff
	476	mov r3, #0x080000 @ + ^ / 2
	477	b 0f
	478
	479	PicoReadS68k16_dec1:
	480	mov r3, #0x0a0000 @ + ^ / 2
	481	0:
	482	ldr r2, =Pico
	483	eor r0, r0, #2
	484	ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd
	485	mov r0, r0, lsr #1 @ +4-6 <<16
	486	add r2, r2, r3 @ map to our address
	487	ldrb r0, [r2, r0]
	488	orr r0, r0, r0, lsl #4
	489	bic r0, r0, #0xf0
	490	bx lr
	491
	492
	493	PicoReadS68k16_pr:
	494	and r2, r0, #0xfe00
	495	cmp r2, #0x8000
	496	@ pcm is on 8-bit bus, would this be same as byte access?
	497	bne m_s68k_read8_pcm
	498
	499	m_s68k_read16_regs:
	500	bic r0, r0, #0xff0000
	501	bic r0, r0, #0x008000
	502	bic r0, r0, #0x000001
	503	cmp r0, #8
	504	bne s68k_reg_read16
	505	mov r0, #1
	506	b cdc_host_r
	507
	508
	509	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	510
	511
	512	.macro m_s68k_write8_2M_decode
	513	ldr r2, =Pico
	514	eor r0, r0, #2
	515	ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd
	516	movs r0, r0, lsr #1 @ +4-6 <<16
	517	add r2, r2, r3 @ map to our address
	518	.endm
	519
	520	PicoWriteS68k8_dec_m2b0: @ overwrite
	521	ands r1, r1, #0x0f
	522	bxeq lr
	523
	524	PicoWriteS68k8_dec_m0b0:
	525	mov r3, #0x080000
	526	b 0f
	527
	528	PicoWriteS68k8_dec_m2b1: @ overwrite
	529	ands r1, r1, #0x0f
	530	bxeq lr
	531
	532	PicoWriteS68k8_dec_m0b1:
	533	mov r3, #0x0a0000
	534	0:
	535	m_s68k_write8_2M_decode
	536	ldrb r0, [r2, r0]!
	537	and r1, r1, #0x0f
	538	movcc r1, r1, lsl #4
	539	andcc r3, r0, #0x0f
	540	andcs r3, r0, #0xf0
	541	orr r3, r3, r1
	542	strneb r3, [r2]
	543	bx lr
	544
	545	PicoWriteS68k8_dec_m1b0: @ underwrite
	546	mov r3, #0x080000
	547	b 0f
	548
	549	PicoWriteS68k8_dec_m1b1:
	550	mov r3, #0x0a0000
	551	0:
	552	ands r1, r1, #0x0f
	553	bxeq lr
	554	m_s68k_write8_2M_decode
	555	ldrb r0, [r2, r0]!
	556	movcc r1, r1, lsl #4
	557	andcc r3, r0, #0x0f
	558	andcs r3, r0, #0xf0
	559	teq r3, r0
	560	bxne lr
	561	orr r3, r3, r1
	562	strneb r3, [r2]
	563	bx lr
	564
	565
	566	PicoWriteS68k8_pr:
	567	and r2, r0, #0xfe00
	568	cmp r2, #0x8000
	569	bne m_s68k_write8_pcm
	570
	571	m_s68k_write8_regs:
	572	bic r0, r0, #0xff0000
	573	bic r0, r0, #0x008000
	574	tst r0, #0x7e00
	575	movne r0, #0
	576	bxne lr
	577	sub r2, r0, #0x59
	578	cmp r2, #0x0f
	579	bhs s68k_reg_write8
	580	bic r0, r0, #1
	581	orr r1, r1, r1, lsl #8
	582	b s68k_reg_write16
	583
	584
	585	m_s68k_write8_pcm:
	586	tst r0, #0x8000
	587	bxne lr
	588	bic r0, r0, #0xff0000
	589	cmp r0, #0x12
	590	movlt r0, r0, lsr #1
	591	blt pcd_pcm_write
	592
	593	cmp r0, #0x2000
	594	bxlt lr
	595
	596	m_s68k_write8_pcm_ram:
	597	ldr r3, =Pico
	598	bic r0, r0, #0x00e000
	599	ldr r3, [r3, #OFS_Pico_rom] @ Pico.mcd
	600	mov r0, r0, lsr #1
	601	add r2, r3, #0x110000
	602	add r2, r2, #0x002200
	603	add r2, r2, #0x000040
	604	ldr r2, [r2]
	605	add r3, r3, #0x100000 @ pcm_ram
	606	and r2, r2, #0x0f000000 @ bank
	607	add r3, r3, r2, lsr #12
	608	strb r1, [r3, r0]
	609	bx lr
	610
	611
	612	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	613
	614
	615	.macro m_s68k_write16_2M_decode
	616	ldr r2, =Pico
	617	eor r0, r0, #2
	618	ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd
	619	mov r0, r0, lsr #1 @ +4-6 <<16
	620	add r2, r2, r3 @ map to our address
	621	.endm
	622
	623	PicoWriteS68k16_dec_m0b0:
	624	mov r3, #0x080000
	625	b 0f
	626
	627	PicoWriteS68k16_dec_m0b1:
	628	mov r3, #0x0a0000
	629	0:
	630	m_s68k_write16_2M_decode
	631	bic r1, r1, #0xf0
	632	orr r1, r1, r1, lsr #4
	633	strb r1, [r2, r0]
	634	bx lr
	635
	636	PicoWriteS68k16_dec_m1b0: @ underwrite
	637	mov r3, #0x080000
	638	b 0f
	639
	640	PicoWriteS68k16_dec_m1b1:
	641	mov r3, #0x0a0000
	642	0:
	643	bics r1, r1, #0xf000
	644	bicnes r1, r1, #0x00f0
	645	bxeq lr
	646	orr r1, r1, r1, lsr #4
	647	m_s68k_write16_2M_decode
	648	ldrb r0, [r2, r0]!
	649	and r3, r1, #0x0f
	650	and r1, r1, #0xf0
	651	tst r0, #0x0f
	652	orreq r0, r0, r3
	653	tst r0, #0xf0
	654	orreq r0, r0, r1
	655	strb r0, [r2]
	656	bx lr
	657
	658	PicoWriteS68k16_dec_m2b0: @ overwrite
	659	mov r3, #0x080000
	660	b 0f
	661
	662	PicoWriteS68k16_dec_m2b1:
	663	mov r3, #0x0a0000
	664	0:
	665	bics r1, r1, #0xf000
	666	bicnes r1, r1, #0x00f0
	667	bxeq lr
	668	orr r1, r1, r1, lsr #4
	669	m_s68k_write16_2M_decode
	670	ldrb r0, [r2, r0]!
	671	ands r3, r1, #0x0f
	672	andne r0, r0, #0xf0
	673	orrne r0, r0, r3
	674	ands r1, r1, #0xf0
	675	andne r0, r0, #0x0f
	676	orrne r0, r0, r1
	677	strb r0, [r2]
	678	bx lr
	679
	680
	681	PicoWriteS68k16_pr:
	682	and r2, r0, #0xfe00
	683	cmp r2, #0x8000
	684	bne m_s68k_write8_pcm
	685
	686	m_s68k_write16_regs:
	687	bic r0, r0, #0xff0000
	688	bic r0, r0, #0x008000
	689	bic r0, r0, #1
	690	tst r0, #0x7e00
	691	movne r0, #0
	692	bxne lr
	693	cmp r0, #0x0e
	694	bne s68k_reg_write16
	695
	696	m_s68k_write16_regs_spec: @ special case
	697	ldr r2, =Pico
	698	mov r0, #0x110000
	699	ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd
	700	add r0, r0, #0x00000f
	701	strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0xf] = d;
	702	bx lr
	703
	704	.pool
	705
	706	@ vim:filetype=armasm