[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.
@*

.equiv PCM_STEP_SHIFT, 11

.text
.align 2

.global PicoReadM68k8_io
.global PicoReadM68k16_io
.global PicoWriteM68k8_io
.global PicoWriteM68k16_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 Read_CDC_Host
.extern m68k_reg_write8
.extern s68k_reg_read16
.extern s68k_reg_write8
.extern s68k_poll_detect
.extern gfx_cd_read
.extern gfx_cd_write16
.extern PicoCpuCS68k
.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+0x22200)
    add     r0, r0, r3
    ldr     r1, [r1]
    eor     r0, r0, #1
    ldrb    r0, [r1, r0]
    bx      lr


PicoReadM68k8_io:
    and     r1, r0, #0xff00
    cmp     r1, #0x2000	              @ a120xx?
    bne     PicoRead8_io

    ldr     r1, =(Pico+0x22200)
    and     r0, r0, #0x3f
    ldr     r1, [r1]                  @ Pico.mcd (used everywhere)
    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      Read_CDC_Host             @ TODO: make it local
    mov     r0, r0, lsr #8
    bx      lr
m_m68k_read8_r09:
    mov     r0, #0
    b       Read_CDC_Host
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+0x22200)
    add     r0, r0, r3
    ldr     r1, [r1]
    bic     r0, r0, #1
    ldrh    r0, [r1, r0]
    bx      lr


PicoReadM68k16_io:
    and     r1, r0, #0xff00
    cmp     r1, #0x2000	              @ a120xx
    bne     PicoRead16_io

m_m68k_read16_m68k_regs:
    ldr     r1, =(Pico+0x22200)
    and     r0, r0, #0x3e
    ldr     r1, [r1]                  @ Pico.mcd (used everywhere)
    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       Read_CDC_Host
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+0x22200)
    add     r0, r0, r12
    ldr     r2, [r2]
    eor     r0, r0, #1
    strb    r3, [r2, r0]
    bx      lr


PicoWriteM68k8_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+0x22200)
    add     r0, r0, r12
    ldr     r1, [r1]
    bic     r0, r0, #1
    strh    r3, [r1, r0]
    bx      lr


PicoWriteM68k16_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+0x22200)
    eor     r0, r0, #2
    ldr     r2, [r2]
    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
    sub     r2, r0, #0x58
    cmp     r2, #0x10
    ldrlo   r2, =gfx_cd_read
    ldrhs   r2, =s68k_reg_read16
    stmfd   sp!,{r0,lr}
    bic     r0, r0, #1
    mov     lr, pc
    bx      r2
    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+0x22200)
    ldr     r1, [r1]
    add     r1, r1, #0x110000
    ldrb    r1, [r1, r0]
    b       s68k_poll_detect


m_s68k_read8_pcm:
    tst     r0, #0x8000
    bne     m_read_null

    @ must not trash r3 and r12
    ldr     r1, =(Pico+0x22200)
    bic     r0, r0, #0xff0000
@    bic     r0, r0, #0x008000
    ldr     r1, [r1]
    mov     r2, #0x110000
    orr     r2, r2, #0x002200
    cmp     r0, #0x2000
    bge     m_s68k_read8_pcm_ram
    cmp     r0, #0x20
    movlt   r0, #0
    bxlt    lr
    orr     r2, r2, #(0x48+8)           @ pcm.ch + addr_offset
    add     r1, r1, r2
    and     r2, r0, #0x1c
    ldr     r1, [r1, r2, lsl #2]
    tst     r0, #2
    moveq   r0, r1, lsr #PCM_STEP_SHIFT
    movne   r0, r1, lsr #(PCM_STEP_SHIFT+8)
    and     r0, r0, #0xff
    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+0x22200)
    eor     r0, r0, #2
    ldr     r2, [r2]
    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
    sub     r2, r0, #0x58
    cmp     r2, #0x10
    blo     gfx_cd_read
    cmp     r0, #8
    bne     s68k_reg_read16
    mov     r0, #1
    b       Read_CDC_Host


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


.macro m_s68k_write8_2M_decode
    ldr     r2, =(Pico+0x22200)
    eor     r0, r0, #2
    ldr     r2, [r2]			@ Pico.rom
    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, #0x58
    cmp     r2, #0x10
    bhs     s68k_reg_write8
    bic     r0, r0, #1
    orr     r1, r1, r1, lsl #8
    b       gfx_cd_write16


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

    cmp     r0, #0x2000
    bxlt    lr

m_s68k_write8_pcm_ram:
    ldr     r3, =(Pico+0x22200)
    bic     r0, r0, #0x00e000
    ldr     r3, [r3]
    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+0x22200)
    eor     r0, r0, #2
    ldr     r2, [r2]
    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
    beq     m_s68k_write16_regs_spec
    sub     r2, r0, #0x58
    cmp     r2, #0x10
    blo     gfx_cd_write16
    and     r3, r1, #0xff
    add     r2, r0, #1
    stmfd   sp!,{r2,r3,lr}
    mov     r1, r1, lsr #8
    bl      s68k_reg_write8
    ldmfd   sp!,{r0,r1,lr}
    b       s68k_reg_write8

m_s68k_write16_regs_spec:               @ special case
    ldr     r2, =(Pico+0x22200)
    mov     r0, #0x110000
    ldr     r2, [r2]
    add     r0, r0, #0x00000f
    strb    r1, [r2, r0]                @ if (a == 0xe) s68k_regs[0xf] = d;
    bx      lr

.pool

@ vim:filetype=armasm
Commit	Line	Data
cff531af	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	@*
4ff2d527	8
4ff2d527	9	.equiv PCM_STEP_SHIFT, 11
4ff2d527	10
4ff2d527	11	.text
0ace9b9a	12	.align 2
	13
	14	.global PicoReadM68k8_io
	15	.global PicoReadM68k16_io
	16	.global PicoWriteM68k8_io
	17	.global PicoWriteM68k16_io
	18
	19	.global PicoReadS68k8_pr
	20	.global PicoReadS68k16_pr
	21	.global PicoWriteS68k8_pr
	22	.global PicoWriteS68k16_pr
	23
	24	.global PicoReadM68k8_cell0
	25	.global PicoReadM68k8_cell1
	26	.global PicoReadM68k16_cell0
	27	.global PicoReadM68k16_cell1
	28	.global PicoWriteM68k8_cell0
	29	.global PicoWriteM68k8_cell1
	30	.global PicoWriteM68k16_cell0
	31	.global PicoWriteM68k16_cell1
	32
	33	.global PicoReadS68k8_dec0
	34	.global PicoReadS68k8_dec1
	35	.global PicoReadS68k16_dec0
	36	.global PicoReadS68k16_dec1
	37	.global PicoWriteS68k8_dec_m0b0
	38	.global PicoWriteS68k8_dec_m1b0
	39	.global PicoWriteS68k8_dec_m2b0
	40	.global PicoWriteS68k8_dec_m0b1
	41	.global PicoWriteS68k8_dec_m1b1
	42	.global PicoWriteS68k8_dec_m2b1
	43	.global PicoWriteS68k16_dec_m0b0
	44	.global PicoWriteS68k16_dec_m1b0
	45	.global PicoWriteS68k16_dec_m2b0
	46	.global PicoWriteS68k16_dec_m0b1
	47	.global PicoWriteS68k16_dec_m1b1
	48	.global PicoWriteS68k16_dec_m2b1
4ff2d527	49
	50	@ externs, just for reference
	51	.extern Pico
4ff2d527	52	.extern Read_CDC_Host
4ff2d527	53	.extern m68k_reg_write8
4ff2d527	54	.extern s68k_reg_read16
4ff2d527	55	.extern s68k_reg_write8
2433f409	56	.extern s68k_poll_detect
0ace9b9a	57	.extern gfx_cd_read
	58	.extern gfx_cd_write16
	59	.extern PicoCpuCS68k
	60	.extern PicoRead8_io
	61	.extern PicoRead16_io
	62	.extern PicoWrite8_io
	63	.extern PicoWrite16_io
08769494	64	.extern m68k_comm_check
4ff2d527	65
4ff2d527	66
	67	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	68
	69	@ utilities
	70
	71	@ r0=addr[in,out], r1,r2=tmp
	72	.macro cell_map
	73	ands r1, r0, #0x01c000
	74	ldrne pc, [pc, r1, lsr #12]
	75	beq 0f @ most common?
	76	.long 0f
	77	.long 0f
	78	.long 0f
	79	.long 0f
	80	.long 1f
	81	.long 1f
	82	.long 2f
	83	.long 3f
	84	1: @ x16 cells
	85	and r1, r0, #0x7e00 @ col
	86	and r2, r0, #0x01fc @ row
	87	orr r2, r2, #0x0400
	88	orr r1, r2, r1, ror #13
	89	b 9f
	90	2: @ x8 cells
	91	and r1, r0, #0x3f00 @ col
	92	and r2, r0, #0x00fc @ row
	93	orr r2, r2, #0x0600
	94	orr r1, r2, r1, ror #12
	95	b 9f
	96	3: @ x4 cells
	97	and r1, r0, #0x1f80 @ col
	98	and r2, r0, #0x007c @ row
	99	orr r1, r2, r1, ror #11
	100	and r2, r0,#0x1e000
	101	orr r1, r1, r2, lsr #6
	102	b 9f
	103	0: @ x32 cells
	104	and r1, r0, #0xfc00 @ col
	105	and r2, r0, #0x03fc @ row
	106	orr r1, r2, r1, ror #14
	107	9:
	108	and r0, r0, #3
	109	orr r0, r0, r1, ror #26 @ rol 4+2
	110	.endm
	111
	112
4ff2d527	113	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	114
	115
	116	m_read_null:
	117	mov r0, #0
	118	bx lr
	119
	120
0ace9b9a	121	PicoReadM68k8_cell0: @ 0x220000 - 0x23ffff, cell arranged
	122	mov r3, #0x0c0000
	123	b 0f
4ff2d527	124
0ace9b9a	125	PicoReadM68k8_cell1: @ 0x220000 - 0x23ffff, cell arranged
	126	mov r3, #0x0e0000
	127	0:
4ff2d527	128	cell_map
4ff2d527	129	ldr r1, =(Pico+0x22200)
0ace9b9a	130	add r0, r0, r3
4ff2d527	131	ldr r1, [r1]
	132	eor r0, r0, #1
	133	ldrb r0, [r1, r0]
	134	bx lr
	135
	136
0ace9b9a	137	PicoReadM68k8_io:
	138	and r1, r0, #0xff00
	139	cmp r1, #0x2000 @ a120xx?
	140	bne PicoRead8_io
4ff2d527	141
	142	ldr r1, =(Pico+0x22200)
	143	and r0, r0, #0x3f
	144	ldr r1, [r1] @ Pico.mcd (used everywhere)
	145	cmp r0, #0x0e
	146	ldrlt pc, [pc, r0, lsl #2]
	147	b m_m68k_read8_hi
	148	.long m_m68k_read8_r00
	149	.long m_m68k_read8_r01
	150	.long m_m68k_read8_r02
	151	.long m_m68k_read8_r03
	152	.long m_m68k_read8_r04
	153	.long m_read_null @ unused bits
	154	.long m_m68k_read8_r06
	155	.long m_m68k_read8_r07
	156	.long m_m68k_read8_r08
	157	.long m_m68k_read8_r09
	158	.long m_read_null @ reserved
	159	.long m_read_null
	160	.long m_m68k_read8_r0c
	161	.long m_m68k_read8_r0d
	162	m_m68k_read8_r00:
	163	add r1, r1, #0x110000
00bd648e	164	ldr r0, [r1, #0x30]
4ff2d527	165	and r0, r0, #0x04000000 @ we need irq2 mask state
	166	mov r0, r0, lsr #19
	167	bx lr
	168	m_m68k_read8_r01:
	169	add r1, r1, #0x110000
	170	add r1, r1, #0x002200
	171	ldrb r0, [r1, #2] @ Pico_mcd->m.busreq
	172	bx lr
	173	m_m68k_read8_r02:
	174	add r1, r1, #0x110000
	175	ldrb r0, [r1, #2]
	176	bx lr
cc5ffc3c	177	m_m68k_read8_r03:
	178	add r1, r1, #0x110000
	179	push {r1, lr}
	180	bl m68k_comm_check
	181	pop {r1, lr}
	182	ldrb r0, [r1, #3]
	183	and r0, r0, #0xc7
	184	bx lr
4ff2d527	185	m_m68k_read8_r04:
	186	add r1, r1, #0x110000
	187	ldrb r0, [r1, #4]
	188	bx lr
	189	m_m68k_read8_r06:
	190	ldrb r0, [r1, #0x73] @ IRQ vector
	191	bx lr
	192	m_m68k_read8_r07:
	193	ldrb r0, [r1, #0x72]
	194	bx lr
	195	m_m68k_read8_r08:
	196	mov r0, #0
	197	bl Read_CDC_Host @ TODO: make it local
	198	mov r0, r0, lsr #8
	199	bx lr
	200	m_m68k_read8_r09:
	201	mov r0, #0
	202	b Read_CDC_Host
	203	m_m68k_read8_r0c:
	204	add r1, r1, #0x110000
	205	add r1, r1, #0x002200
	206	ldr r0, [r1, #0x14] @ Pico_mcd->m.timer_stopwatch
	207	mov r0, r0, lsr #24
	208	bx lr
	209	m_m68k_read8_r0d:
	210	add r1, r1, #0x110000
	211	add r1, r1, #0x002200
	212	ldr r0, [r1, #0x14]
	213	mov r0, r0, lsr #16
	214	bx lr
	215	m_m68k_read8_hi:
	216	cmp r0, #0x30
4ff2d527	217	add r1, r1, #0x110000
cc5ffc3c	218	movge r0, #0
	219	bxge lr
	220	add r1, r0
	221	push {r1, lr}
	222	bl m68k_comm_check
	223	pop {r1, lr}
	224	ldrb r0, [r1]
	225	bx lr
4ff2d527	226
4ff2d527	227
	228	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	229
	230
0ace9b9a	231	PicoReadM68k16_cell0: @ 0x220000 - 0x23ffff, cell arranged
	232	mov r3, #0x0c0000
	233	b 0f
4ff2d527	234
0ace9b9a	235	PicoReadM68k16_cell1: @ 0x220000 - 0x23ffff, cell arranged
	236	mov r3, #0x0e0000
	237	0:
4ff2d527	238	cell_map
4ff2d527	239	ldr r1, =(Pico+0x22200)
0ace9b9a	240	add r0, r0, r3
4ff2d527	241	ldr r1, [r1]
	242	bic r0, r0, #1
	243	ldrh r0, [r1, r0]
	244	bx lr
	245
	246
0ace9b9a	247	PicoReadM68k16_io:
	248	and r1, r0, #0xff00
	249	cmp r1, #0x2000 @ a120xx
	250	bne PicoRead16_io
4ff2d527	251
	252	m_m68k_read16_m68k_regs:
	253	ldr r1, =(Pico+0x22200)
	254	and r0, r0, #0x3e
	255	ldr r1, [r1] @ Pico.mcd (used everywhere)
	256	cmp r0, #0x0e
	257	ldrlt pc, [pc, r0, lsl #1]
	258	b m_m68k_read16_hi
	259	.long m_m68k_read16_r00
	260	.long m_m68k_read16_r02
	261	.long m_m68k_read16_r04
	262	.long m_m68k_read16_r06
	263	.long m_m68k_read16_r08
	264	.long m_read_null @ reserved
	265	.long m_m68k_read16_r0c
	266	m_m68k_read16_r00:
	267	add r1, r1, #0x110000
7a1f6e45	268	ldr r0, [r1, #0x30]
4ff2d527	269	add r1, r1, #0x002200
	270	ldrb r1, [r1, #2] @ Pico_mcd->m.busreq
	271	and r0, r0, #0x04000000 @ we need irq2 mask state
	272	orr r0, r1, r0, lsr #11
	273	bx lr
cc5ffc3c	274	m_m68k_read16_r02:
	275	add r1, r1, #0x110000
	276	push {r1, lr}
	277	bl m68k_comm_check
	278	pop {r1, lr}
	279	ldrb r2, [r1, #3]
	280	ldrb r0, [r1, #2]
c008977e	281	and r2, r2, #0xc7
cc5ffc3c	282	orr r0, r2, r0, lsl #8
cc5ffc3c	283	bx lr
4ff2d527	284	m_m68k_read16_r04:
	285	add r1, r1, #0x110000
	286	ldrb r0, [r1, #4]
	287	mov r0, r0, lsl #8
	288	bx lr
	289	m_m68k_read16_r06:
	290	ldrh r0, [r1, #0x72] @ IRQ vector
	291	bx lr
	292	m_m68k_read16_r08:
	293	mov r0, #0
	294	b Read_CDC_Host
	295	m_m68k_read16_r0c:
	296	add r1, r1, #0x110000
	297	add r1, r1, #0x002200
	298	ldr r0, [r1, #0x14]
	299	mov r0, r0, lsr #16
	300	bx lr
	301	m_m68k_read16_hi:
	302	cmp r0, #0x30
cc5ffc3c	303	add r1, r1, #0x110000
4ff2d527	304	movge r0, #0
4ff2d527	305	bxge lr
cc5ffc3c	306
	307	add r1, r0, r1
	308	push {r1, lr}
	309	bl m68k_comm_check
	310	pop {r0, lr}
	311	ldrh r0, [r0]
	312	mov r1, r0, lsr #8
	313	and r0, r0, #0xff
	314	orr r0, r1, r0, lsl #8
	315	bx lr
4ff2d527	316
4ff2d527	317
0ace9b9a	318	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
4ff2d527	319
4ff2d527	320
0ace9b9a	321	PicoWriteM68k8_cell0: @ 0x220000 - 0x23ffff, cell arranged
	322	mov r12,#0x0c0000
	323	b 0f
4ff2d527	324
0ace9b9a	325	PicoWriteM68k8_cell1: @ 0x220000 - 0x23ffff, cell arranged
	326	mov r12,#0x0e0000
	327	0:
	328	mov r3, r1
	329	cell_map
	330	ldr r2, =(Pico+0x22200)
	331	add r0, r0, r12
	332	ldr r2, [r2]
	333	eor r0, r0, #1
	334	strb r3, [r2, r0]
4ff2d527	335	bx lr
	336
	337
0ace9b9a	338	PicoWriteM68k8_io:
	339	and r2, r0, #0xff00
	340	cmp r2, #0x2000 @ a120xx?
	341	beq m68k_reg_write8
	342	b PicoWrite8_io
	343
	344
4ff2d527	345	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	346
	347
0ace9b9a	348	PicoWriteM68k16_cell0: @ 0x220000 - 0x23ffff, cell arranged
	349	mov r12, #0x0c0000
	350	b 0f
	351
	352	PicoWriteM68k16_cell1: @ 0x220000 - 0x23ffff, cell arranged
	353	mov r12, #0x0e0000
	354	0:
	355	mov r3, r1
	356	cell_map
4ff2d527	357	ldr r1, =(Pico+0x22200)
0ace9b9a	358	add r0, r0, r12
4ff2d527	359	ldr r1, [r1]
4ff2d527	360	bic r0, r0, #1
0ace9b9a	361	strh r3, [r1, r0]
4ff2d527	362	bx lr
	363
	364
0ace9b9a	365	PicoWriteM68k16_io:
	366	and r2, r0, #0xff00
	367	cmp r2, #0x2000 @ a120xx?
	368	bne PicoWrite16_io
4ff2d527	369
0ace9b9a	370	m_m68k_write16_regs:
	371	and r0, r0, #0x3e
	372	cmp r0, #0x0e
	373	beq m_m68k_write16_regs_spec
	374	and r3, r1, #0xff
	375	add r2, r0, #1
	376	stmfd sp!,{r2,r3,lr}
	377	mov r1, r1, lsr #8
	378	bl m68k_reg_write8
	379	ldmfd sp!,{r0,r1,lr}
	380	b m68k_reg_write8
4ff2d527	381
0ace9b9a	382	m_m68k_write16_regs_spec: @ special case
0ace9b9a	383	mov r1, r1, lsr #8
08769494	384	b m68k_reg_write8
4ff2d527	385
4ff2d527	386
0ace9b9a	387	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	388	@ Sub 68k
	389	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
4ff2d527	390
4ff2d527	391
0ace9b9a	392	PicoReadS68k8_dec0: @ 0x080000 - 0x0bffff
	393	mov r3, #0x080000 @ + ^ / 2
	394	b 0f
4ff2d527	395
0ace9b9a	396	PicoReadS68k8_dec1:
	397	mov r3, #0x0a0000 @ + ^ / 2
	398	0:
5c69a605	399	ldr r2, =(Pico+0x22200)
	400	eor r0, r0, #2
	401	ldr r2, [r2]
	402	movs r0, r0, lsr #1 @ +4-6 <<16
0ace9b9a	403	add r2, r2, r3 @ map to our address
5c69a605	404	ldrb r0, [r2, r0]
	405	movcc r0, r0, lsr #4
	406	andcs r0, r0, #0xf
	407	bx lr
5c69a605	408
4ff2d527	409
0ace9b9a	410	PicoReadS68k8_pr:
	411	and r2, r0, #0xfe00
	412	cmp r2, #0x8000
	413	bne m_s68k_read8_pcm
4ff2d527	414
	415	m_s68k_read8_regs:
	416	bic r0, r0, #0xff0000
	417	bic r0, r0, #0x008000
2433f409	418	sub r2, r0, #0x0e
	419	cmp r2, #(0x30-0x0e)
	420	blo m_s68k_read8_comm
4ff2d527	421	sub r2, r0, #0x58
	422	cmp r2, #0x10
	423	ldrlo r2, =gfx_cd_read
	424	ldrhs r2, =s68k_reg_read16
	425	stmfd sp!,{r0,lr}
	426	bic r0, r0, #1
	427	mov lr, pc
	428	bx r2
	429	ldmfd sp!,{r1,lr}
	430	tst r1, #1
	431	moveq r0, r0, lsr #8
	432	and r0, r0, #0xff
	433	bx lr
	434
2433f409	435	m_s68k_read8_comm:
	436	ldr r1, =(Pico+0x22200)
	437	ldr r1, [r1]
	438	add r1, r1, #0x110000
	439	ldrb r1, [r1, r0]
	440	b s68k_poll_detect
	441
4ff2d527	442
0ace9b9a	443	m_s68k_read8_pcm:
	444	tst r0, #0x8000
	445	bne m_read_null
4ff2d527	446
0ace9b9a	447	@ must not trash r3 and r12
4ff2d527	448	ldr r1, =(Pico+0x22200)
0ace9b9a	449	bic r0, r0, #0xff0000
0ace9b9a	450	@ bic r0, r0, #0x008000
4ff2d527	451	ldr r1, [r1]
0ace9b9a	452	mov r2, #0x110000
	453	orr r2, r2, #0x002200
	454	cmp r0, #0x2000
	455	bge m_s68k_read8_pcm_ram
	456	cmp r0, #0x20
	457	movlt r0, #0
	458	bxlt lr
	459	orr r2, r2, #(0x48+8) @ pcm.ch + addr_offset
	460	add r1, r1, r2
	461	and r2, r0, #0x1c
	462	ldr r1, [r1, r2, lsl #2]
	463	tst r0, #2
	464	moveq r0, r1, lsr #PCM_STEP_SHIFT
	465	movne r0, r1, lsr #(PCM_STEP_SHIFT+8)
	466	and r0, r0, #0xff
5c69a605	467	bx lr
4ff2d527	468
0ace9b9a	469	m_s68k_read8_pcm_ram:
	470	orr r2, r2, #0x40
	471	ldr r2, [r1, r2]
	472	add r1, r1, #0x100000 @ pcm_ram
	473	and r2, r2, #0x0f000000 @ bank
	474	add r1, r1, r2, lsr #12
	475	bic r0, r0, #0x00e000
	476	mov r0, r0, lsr #1
	477	ldrb r0, [r1, r0]
	478	bx lr
4ff2d527	479
	480
	481	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	482
	483
0ace9b9a	484	PicoReadS68k16_dec0: @ 0x080000 - 0x0bffff
	485	mov r3, #0x080000 @ + ^ / 2
	486	b 0f
5c69a605	487
0ace9b9a	488	PicoReadS68k16_dec1:
	489	mov r3, #0x0a0000 @ + ^ / 2
	490	0:
5c69a605	491	ldr r2, =(Pico+0x22200)
	492	eor r0, r0, #2
	493	ldr r2, [r2]
	494	mov r0, r0, lsr #1 @ +4-6 <<16
0ace9b9a	495	add r2, r2, r3 @ map to our address
0ace9b9a	496	ldrb r0, [r2, r0]
5c69a605	497	orr r0, r0, r0, lsl #4
5c69a605	498	bic r0, r0, #0xf0
5c69a605	499	bx lr
4ff2d527	500
4ff2d527	501
0ace9b9a	502	PicoReadS68k16_pr:
	503	and r2, r0, #0xfe00
	504	cmp r2, #0x8000
	505	@ pcm is on 8-bit bus, would this be same as byte access?
	506	bne m_s68k_read8_pcm
4ff2d527	507
0ace9b9a	508	m_s68k_read16_regs:
4ff2d527	509	bic r0, r0, #0xff0000
	510	bic r0, r0, #0x008000
	511	bic r0, r0, #0x000001
4ff2d527	512	sub r2, r0, #0x58
4ff2d527	513	cmp r2, #0x10
0ace9b9a	514	blo gfx_cd_read
	515	cmp r0, #8
	516	bne s68k_reg_read16
	517	mov r0, #1
	518	b Read_CDC_Host
4ff2d527	519
4ff2d527	520
	521	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	522
	523
0ace9b9a	524	.macro m_s68k_write8_2M_decode
48e8482f	525	ldr r2, =(Pico+0x22200)
48e8482f	526	eor r0, r0, #2
0ace9b9a	527	ldr r2, [r2] @ Pico.rom
48e8482f	528	movs r0, r0, lsr #1 @ +4-6 <<16
0ace9b9a	529	add r2, r2, r3 @ map to our address
48e8482f	530	.endm
48e8482f	531
0ace9b9a	532	PicoWriteS68k8_dec_m2b0: @ overwrite
	533	ands r1, r1, #0x0f
	534	bxeq lr
	535
	536	PicoWriteS68k8_dec_m0b0:
	537	mov r3, #0x080000
	538	b 0f
	539
	540	PicoWriteS68k8_dec_m2b1: @ overwrite
	541	ands r1, r1, #0x0f
	542	bxeq lr
	543
	544	PicoWriteS68k8_dec_m0b1:
	545	mov r3, #0x0a0000
	546	0:
	547	m_s68k_write8_2M_decode
48e8482f	548	ldrb r0, [r2, r0]!
	549	and r1, r1, #0x0f
	550	movcc r1, r1, lsl #4
	551	andcc r3, r0, #0x0f
	552	andcs r3, r0, #0xf0
	553	orr r3, r3, r1
48e8482f	554	strneb r3, [r2]
48e8482f	555	bx lr
48e8482f	556
0ace9b9a	557	PicoWriteS68k8_dec_m1b0: @ underwrite
	558	mov r3, #0x080000
	559	b 0f
	560
	561	PicoWriteS68k8_dec_m1b1:
	562	mov r3, #0x0a0000
	563	0:
48e8482f	564	ands r1, r1, #0x0f
48e8482f	565	bxeq lr
0ace9b9a	566	m_s68k_write8_2M_decode
48e8482f	567	ldrb r0, [r2, r0]!
	568	movcc r1, r1, lsl #4
	569	andcc r3, r0, #0x0f
	570	andcs r3, r0, #0xf0
0ace9b9a	571	teq r3, r0
0ace9b9a	572	bxne lr
48e8482f	573	orr r3, r3, r1
48e8482f	574	strneb r3, [r2]
48e8482f	575	bx lr
48e8482f	576
48e8482f	577
0ace9b9a	578	PicoWriteS68k8_pr:
	579	and r2, r0, #0xfe00
	580	cmp r2, #0x8000
	581	bne m_s68k_write8_pcm
48e8482f	582
0ace9b9a	583	m_s68k_write8_regs:
4ff2d527	584	bic r0, r0, #0xff0000
0ace9b9a	585	bic r0, r0, #0x008000
	586	tst r0, #0x7e00
	587	movne r0, #0
	588	bxne lr
	589	sub r2, r0, #0x58
	590	cmp r2, #0x10
	591	bhs s68k_reg_write8
	592	bic r0, r0, #1
	593	orr r1, r1, r1, lsl #8
	594	b gfx_cd_write16
4ff2d527	595
	596
	597	m_s68k_write8_pcm:
0ace9b9a	598	tst r0, #0x8000
0ace9b9a	599	bxne lr
4ff2d527	600	bic r0, r0, #0xff0000
	601	cmp r0, #0x12
	602	movlt r0, r0, lsr #1
	603	blt pcm_write
	604
	605	cmp r0, #0x2000
	606	bxlt lr
	607
	608	m_s68k_write8_pcm_ram:
	609	ldr r3, =(Pico+0x22200)
	610	bic r0, r0, #0x00e000
	611	ldr r3, [r3]
	612	mov r0, r0, lsr #1
	613	add r2, r3, #0x110000
	614	add r2, r2, #0x002200
	615	add r2, r2, #0x000040
	616	ldr r2, [r2]
	617	add r3, r3, #0x100000 @ pcm_ram
	618	and r2, r2, #0x0f000000 @ bank
	619	add r3, r3, r2, lsr #12
	620	strb r1, [r3, r0]
	621	bx lr
	622
	623
4ff2d527	624	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	625
	626
0ace9b9a	627	.macro m_s68k_write16_2M_decode
48e8482f	628	ldr r2, =(Pico+0x22200)
	629	eor r0, r0, #2
	630	ldr r2, [r2]
	631	mov r0, r0, lsr #1 @ +4-6 <<16
0ace9b9a	632	add r2, r2, r3 @ map to our address
48e8482f	633	.endm
48e8482f	634
0ace9b9a	635	PicoWriteS68k16_dec_m0b0:
	636	mov r3, #0x080000
	637	b 0f
	638
	639	PicoWriteS68k16_dec_m0b1:
	640	mov r3, #0x0a0000
	641	0:
	642	m_s68k_write16_2M_decode
48e8482f	643	bic r1, r1, #0xf0
	644	orr r1, r1, r1, lsr #4
	645	strb r1, [r2, r0]
	646	bx lr
48e8482f	647
0ace9b9a	648	PicoWriteS68k16_dec_m1b0: @ underwrite
	649	mov r3, #0x080000
	650	b 0f
	651
	652	PicoWriteS68k16_dec_m1b1:
	653	mov r3, #0x0a0000
	654	0:
48e8482f	655	bics r1, r1, #0xf000
	656	bicnes r1, r1, #0x00f0
	657	bxeq lr
	658	orr r1, r1, r1, lsr #4
0ace9b9a	659	m_s68k_write16_2M_decode
48e8482f	660	ldrb r0, [r2, r0]!
	661	and r3, r1, #0x0f
	662	and r1, r1, #0xf0
	663	tst r0, #0x0f
	664	orreq r0, r0, r3
	665	tst r0, #0xf0
	666	orreq r0, r0, r1
	667	strb r0, [r2]
	668	bx lr
48e8482f	669
0ace9b9a	670	PicoWriteS68k16_dec_m2b0: @ overwrite
	671	mov r3, #0x080000
	672	b 0f
	673
	674	PicoWriteS68k16_dec_m2b1:
	675	mov r3, #0x0a0000
	676	0:
48e8482f	677	bics r1, r1, #0xf000
	678	bicnes r1, r1, #0x00f0
	679	bxeq lr
	680	orr r1, r1, r1, lsr #4
0ace9b9a	681	m_s68k_write16_2M_decode
48e8482f	682	ldrb r0, [r2, r0]!
	683	ands r3, r1, #0x0f
	684	andne r0, r0, #0xf0
	685	orrne r0, r0, r3
	686	ands r1, r1, #0xf0
	687	andne r0, r0, #0x0f
	688	orrne r0, r0, r1
	689	strb r0, [r2]
	690	bx lr
48e8482f	691
4ff2d527	692
0ace9b9a	693	PicoWriteS68k16_pr:
	694	and r2, r0, #0xfe00
	695	cmp r2, #0x8000
	696	bne m_s68k_write8_pcm
4ff2d527	697
	698	m_s68k_write16_regs:
	699	bic r0, r0, #0xff0000
	700	bic r0, r0, #0x008000
5c69a605	701	bic r0, r0, #1
4ff2d527	702	tst r0, #0x7e00
	703	movne r0, #0
	704	bxne lr
5c69a605	705	cmp r0, #0x0e
5c69a605	706	beq m_s68k_write16_regs_spec
4ff2d527	707	sub r2, r0, #0x58
4ff2d527	708	cmp r2, #0x10
5c69a605	709	blo gfx_cd_write16
4ff2d527	710	and r3, r1, #0xff
4ff2d527	711	add r2, r0, #1
4ff2d527	712	stmfd sp!,{r2,r3,lr}
	713	mov r1, r1, lsr #8
	714	bl s68k_reg_write8
	715	ldmfd sp!,{r0,r1,lr}
	716	b s68k_reg_write8
	717
5c69a605	718	m_s68k_write16_regs_spec: @ special case
	719	ldr r2, =(Pico+0x22200)
	720	mov r0, #0x110000
	721	ldr r2, [r2]
	722	add r0, r0, #0x00000f
	723	strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0xf] = d;
48e8482f	724	bx lr
4ff2d527	725
0ace9b9a	726	.pool
6cadc2da	727
cff531af	728	@ vim:filetype=armasm