[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_adclk
.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


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

@ 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
    ldrb    r0, [r1, #3]
    add     r1, r1, #0x002200
    ldr     r1, [r1, #4]
    and     r0, r0, #0xc7
    tst     r1, #2                    @ DMNA pending?
    bxeq    lr
    bic     r0, r0, #1
    orr     r0, r0, #2
    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:
    push    {r0,r1,lr}
    bl      m68k_comm_check
    pop     {r0,r1,lr}
    cmp     r0, #0x30
    movge   r0, #0
    bxeq    lr
    add     r1, r1, #0x110000
    ldrb    r0, [r1, r0]
    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
    ldrb    r0, [r1, #2]
    ldrb    r2, [r1, #3]
    add     r1, r1, #0x002200
    ldr     r1, [r1, #4]
    and     r2, r2, #0xc7
    orr     r0, r2, r0, lsl #8
    tst     r1, #2                    @ DMNA pending?
    bxeq    lr
    bic     r0, r0, #1
    orr     r0, r0, #2
    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
    addlt   r1, r1, #0x110000
    ldrlth  r1, [r1, r0]
    movge   r0, #0
    bxge    lr
    mov     r0, r1, lsr #8
    and     r1, r1, #0xff
    orr     r0, r0, r1, 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
    ldr     r2, =(Pico+0x22200)
    ldr     r3, =s68k_poll_adclk
    mov     r0, #0x110000
    ldr     r2, [r2]
    add     r0, r0, #0x00000e
    mov     r1, r1, lsr #8
    strb    r1, [r2, r0]                @ if (a == 0xe) s68k_regs[0x0e] = d >> 8;
    ldr     r2, [r3]
    mov     r1, #0
    and     r2, r2, #0xfe
    cmp     r2, #0x0e
    bxne    lr
    ldr     r0, =PicoCpuCS68k
    str     r1, [r0, #0x58]             @ push s68k out of stopped state
    str     r1, [r3]
    bx      lr


@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@                                   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
7a1f6e45	56	.extern s68k_poll_adclk
2433f409	57	.extern s68k_poll_detect
0ace9b9a	58	.extern gfx_cd_read
	59	.extern gfx_cd_write16
	60	.extern PicoCpuCS68k
	61	.extern PicoRead8_io
	62	.extern PicoRead16_io
	63	.extern PicoWrite8_io
	64	.extern PicoWrite16_io
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
	177	m_m68k_read8_r03:
	178	add r1, r1, #0x110000
	179	ldrb r0, [r1, #3]
c008977e	180	add r1, r1, #0x002200
c008977e	181	ldr r1, [r1, #4]
4ff2d527	182	and r0, r0, #0xc7
c008977e	183	tst r1, #2 @ DMNA pending?
	184	bxeq lr
	185	bic r0, r0, #1
	186	orr r0, r0, #2
4ff2d527	187	bx lr
	188	m_m68k_read8_r04:
	189	add r1, r1, #0x110000
	190	ldrb r0, [r1, #4]
	191	bx lr
	192	m_m68k_read8_r06:
	193	ldrb r0, [r1, #0x73] @ IRQ vector
	194	bx lr
	195	m_m68k_read8_r07:
	196	ldrb r0, [r1, #0x72]
	197	bx lr
	198	m_m68k_read8_r08:
	199	mov r0, #0
	200	bl Read_CDC_Host @ TODO: make it local
	201	mov r0, r0, lsr #8
	202	bx lr
	203	m_m68k_read8_r09:
	204	mov r0, #0
	205	b Read_CDC_Host
	206	m_m68k_read8_r0c:
	207	add r1, r1, #0x110000
	208	add r1, r1, #0x002200
	209	ldr r0, [r1, #0x14] @ Pico_mcd->m.timer_stopwatch
	210	mov r0, r0, lsr #24
	211	bx lr
	212	m_m68k_read8_r0d:
	213	add r1, r1, #0x110000
	214	add r1, r1, #0x002200
	215	ldr r0, [r1, #0x14]
	216	mov r0, r0, lsr #16
	217	bx lr
	218	m_m68k_read8_hi:
bc3c13d3	219	push {r0,r1,lr}
	220	bl m68k_comm_check
	221	pop {r0,r1,lr}
4ff2d527	222	cmp r0, #0x30
	223	movge r0, #0
	224	bxeq lr
	225	add r1, r1, #0x110000
	226	ldrb r0, [r1, r0]
	227	bx lr
	228
4ff2d527	229
	230	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	231
	232
0ace9b9a	233	PicoReadM68k16_cell0: @ 0x220000 - 0x23ffff, cell arranged
	234	mov r3, #0x0c0000
	235	b 0f
4ff2d527	236
0ace9b9a	237	PicoReadM68k16_cell1: @ 0x220000 - 0x23ffff, cell arranged
	238	mov r3, #0x0e0000
	239	0:
4ff2d527	240	cell_map
4ff2d527	241	ldr r1, =(Pico+0x22200)
0ace9b9a	242	add r0, r0, r3
4ff2d527	243	ldr r1, [r1]
	244	bic r0, r0, #1
	245	ldrh r0, [r1, r0]
	246	bx lr
	247
	248
0ace9b9a	249	PicoReadM68k16_io:
	250	and r1, r0, #0xff00
	251	cmp r1, #0x2000 @ a120xx
	252	bne PicoRead16_io
4ff2d527	253
	254	m_m68k_read16_m68k_regs:
	255	ldr r1, =(Pico+0x22200)
	256	and r0, r0, #0x3e
	257	ldr r1, [r1] @ Pico.mcd (used everywhere)
	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
7a1f6e45	270	ldr r0, [r1, #0x30]
4ff2d527	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	ldrb r0, [r1, #2]
c008977e	279	ldrb r2, [r1, #3]
	280	add r1, r1, #0x002200
	281	ldr r1, [r1, #4]
	282	and r2, r2, #0xc7
	283	orr r0, r2, r0, lsl #8
	284	tst r1, #2 @ DMNA pending?
	285	bxeq lr
	286	bic r0, r0, #1
	287	orr r0, r0, #2
4ff2d527	288	bx lr
	289	m_m68k_read16_r04:
	290	add r1, r1, #0x110000
	291	ldrb r0, [r1, #4]
	292	mov r0, r0, lsl #8
	293	bx lr
	294	m_m68k_read16_r06:
	295	ldrh r0, [r1, #0x72] @ IRQ vector
	296	bx lr
	297	m_m68k_read16_r08:
	298	mov r0, #0
	299	b Read_CDC_Host
	300	m_m68k_read16_r0c:
	301	add r1, r1, #0x110000
	302	add r1, r1, #0x002200
	303	ldr r0, [r1, #0x14]
	304	mov r0, r0, lsr #16
	305	bx lr
	306	m_m68k_read16_hi:
	307	cmp r0, #0x30
	308	addlt r1, r1, #0x110000
	309	ldrlth r1, [r1, r0]
	310	movge r0, #0
	311	bxge lr
	312	mov r0, r1, lsr #8
	313	and r1, r1, #0xff
	314	orr r0, r0, r1, lsl #8
	315	bx lr
	316
	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
	383	ldr r2, =(Pico+0x22200)
	384	ldr r3, =s68k_poll_adclk
	385	mov r0, #0x110000
	386	ldr r2, [r2]
	387	add r0, r0, #0x00000e
	388	mov r1, r1, lsr #8
	389	strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0x0e] = d >> 8;
	390	ldr r2, [r3]
	391	mov r1, #0
	392	and r2, r2, #0xfe
	393	cmp r2, #0x0e
	394	bxne lr
	395	ldr r0, =PicoCpuCS68k
	396	str r1, [r0, #0x58] @ push s68k out of stopped state
	397	str r1, [r3]
4ff2d527	398	bx lr
	399
	400
0ace9b9a	401	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	402	@ Sub 68k
	403	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
4ff2d527	404
4ff2d527	405
0ace9b9a	406	PicoReadS68k8_dec0: @ 0x080000 - 0x0bffff
	407	mov r3, #0x080000 @ + ^ / 2
	408	b 0f
4ff2d527	409
0ace9b9a	410	PicoReadS68k8_dec1:
	411	mov r3, #0x0a0000 @ + ^ / 2
	412	0:
5c69a605	413	ldr r2, =(Pico+0x22200)
	414	eor r0, r0, #2
	415	ldr r2, [r2]
	416	movs r0, r0, lsr #1 @ +4-6 <<16
0ace9b9a	417	add r2, r2, r3 @ map to our address
5c69a605	418	ldrb r0, [r2, r0]
	419	movcc r0, r0, lsr #4
	420	andcs r0, r0, #0xf
	421	bx lr
5c69a605	422
4ff2d527	423
0ace9b9a	424	PicoReadS68k8_pr:
	425	and r2, r0, #0xfe00
	426	cmp r2, #0x8000
	427	bne m_s68k_read8_pcm
4ff2d527	428
	429	m_s68k_read8_regs:
	430	bic r0, r0, #0xff0000
	431	bic r0, r0, #0x008000
2433f409	432	sub r2, r0, #0x0e
	433	cmp r2, #(0x30-0x0e)
	434	blo m_s68k_read8_comm
4ff2d527	435	sub r2, r0, #0x58
	436	cmp r2, #0x10
	437	ldrlo r2, =gfx_cd_read
	438	ldrhs r2, =s68k_reg_read16
	439	stmfd sp!,{r0,lr}
	440	bic r0, r0, #1
	441	mov lr, pc
	442	bx r2
	443	ldmfd sp!,{r1,lr}
	444	tst r1, #1
	445	moveq r0, r0, lsr #8
	446	and r0, r0, #0xff
	447	bx lr
	448
2433f409	449	m_s68k_read8_comm:
	450	ldr r1, =(Pico+0x22200)
	451	ldr r1, [r1]
	452	add r1, r1, #0x110000
	453	ldrb r1, [r1, r0]
	454	b s68k_poll_detect
	455
4ff2d527	456
0ace9b9a	457	m_s68k_read8_pcm:
	458	tst r0, #0x8000
	459	bne m_read_null
4ff2d527	460
0ace9b9a	461	@ must not trash r3 and r12
4ff2d527	462	ldr r1, =(Pico+0x22200)
0ace9b9a	463	bic r0, r0, #0xff0000
0ace9b9a	464	@ bic r0, r0, #0x008000
4ff2d527	465	ldr r1, [r1]
0ace9b9a	466	mov r2, #0x110000
	467	orr r2, r2, #0x002200
	468	cmp r0, #0x2000
	469	bge m_s68k_read8_pcm_ram
	470	cmp r0, #0x20
	471	movlt r0, #0
	472	bxlt lr
	473	orr r2, r2, #(0x48+8) @ pcm.ch + addr_offset
	474	add r1, r1, r2
	475	and r2, r0, #0x1c
	476	ldr r1, [r1, r2, lsl #2]
	477	tst r0, #2
	478	moveq r0, r1, lsr #PCM_STEP_SHIFT
	479	movne r0, r1, lsr #(PCM_STEP_SHIFT+8)
	480	and r0, r0, #0xff
5c69a605	481	bx lr
4ff2d527	482
0ace9b9a	483	m_s68k_read8_pcm_ram:
	484	orr r2, r2, #0x40
	485	ldr r2, [r1, r2]
	486	add r1, r1, #0x100000 @ pcm_ram
	487	and r2, r2, #0x0f000000 @ bank
	488	add r1, r1, r2, lsr #12
	489	bic r0, r0, #0x00e000
	490	mov r0, r0, lsr #1
	491	ldrb r0, [r1, r0]
	492	bx lr
4ff2d527	493
	494
	495	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	496
	497
0ace9b9a	498	PicoReadS68k16_dec0: @ 0x080000 - 0x0bffff
	499	mov r3, #0x080000 @ + ^ / 2
	500	b 0f
5c69a605	501
0ace9b9a	502	PicoReadS68k16_dec1:
	503	mov r3, #0x0a0000 @ + ^ / 2
	504	0:
5c69a605	505	ldr r2, =(Pico+0x22200)
	506	eor r0, r0, #2
	507	ldr r2, [r2]
	508	mov r0, r0, lsr #1 @ +4-6 <<16
0ace9b9a	509	add r2, r2, r3 @ map to our address
0ace9b9a	510	ldrb r0, [r2, r0]
5c69a605	511	orr r0, r0, r0, lsl #4
5c69a605	512	bic r0, r0, #0xf0
5c69a605	513	bx lr
4ff2d527	514
4ff2d527	515
0ace9b9a	516	PicoReadS68k16_pr:
	517	and r2, r0, #0xfe00
	518	cmp r2, #0x8000
	519	@ pcm is on 8-bit bus, would this be same as byte access?
	520	bne m_s68k_read8_pcm
4ff2d527	521
0ace9b9a	522	m_s68k_read16_regs:
4ff2d527	523	bic r0, r0, #0xff0000
	524	bic r0, r0, #0x008000
	525	bic r0, r0, #0x000001
4ff2d527	526	sub r2, r0, #0x58
4ff2d527	527	cmp r2, #0x10
0ace9b9a	528	blo gfx_cd_read
	529	cmp r0, #8
	530	bne s68k_reg_read16
	531	mov r0, #1
	532	b Read_CDC_Host
4ff2d527	533
4ff2d527	534
	535	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	536
	537
0ace9b9a	538	.macro m_s68k_write8_2M_decode
48e8482f	539	ldr r2, =(Pico+0x22200)
48e8482f	540	eor r0, r0, #2
0ace9b9a	541	ldr r2, [r2] @ Pico.rom
48e8482f	542	movs r0, r0, lsr #1 @ +4-6 <<16
0ace9b9a	543	add r2, r2, r3 @ map to our address
48e8482f	544	.endm
48e8482f	545
0ace9b9a	546	PicoWriteS68k8_dec_m2b0: @ overwrite
	547	ands r1, r1, #0x0f
	548	bxeq lr
	549
	550	PicoWriteS68k8_dec_m0b0:
	551	mov r3, #0x080000
	552	b 0f
	553
	554	PicoWriteS68k8_dec_m2b1: @ overwrite
	555	ands r1, r1, #0x0f
	556	bxeq lr
	557
	558	PicoWriteS68k8_dec_m0b1:
	559	mov r3, #0x0a0000
	560	0:
	561	m_s68k_write8_2M_decode
48e8482f	562	ldrb r0, [r2, r0]!
	563	and r1, r1, #0x0f
	564	movcc r1, r1, lsl #4
	565	andcc r3, r0, #0x0f
	566	andcs r3, r0, #0xf0
	567	orr r3, r3, r1
48e8482f	568	strneb r3, [r2]
48e8482f	569	bx lr
48e8482f	570
0ace9b9a	571	PicoWriteS68k8_dec_m1b0: @ underwrite
	572	mov r3, #0x080000
	573	b 0f
	574
	575	PicoWriteS68k8_dec_m1b1:
	576	mov r3, #0x0a0000
	577	0:
48e8482f	578	ands r1, r1, #0x0f
48e8482f	579	bxeq lr
0ace9b9a	580	m_s68k_write8_2M_decode
48e8482f	581	ldrb r0, [r2, r0]!
	582	movcc r1, r1, lsl #4
	583	andcc r3, r0, #0x0f
	584	andcs r3, r0, #0xf0
0ace9b9a	585	teq r3, r0
0ace9b9a	586	bxne lr
48e8482f	587	orr r3, r3, r1
48e8482f	588	strneb r3, [r2]
48e8482f	589	bx lr
48e8482f	590
48e8482f	591
0ace9b9a	592	PicoWriteS68k8_pr:
	593	and r2, r0, #0xfe00
	594	cmp r2, #0x8000
	595	bne m_s68k_write8_pcm
48e8482f	596
0ace9b9a	597	m_s68k_write8_regs:
4ff2d527	598	bic r0, r0, #0xff0000
0ace9b9a	599	bic r0, r0, #0x008000
	600	tst r0, #0x7e00
	601	movne r0, #0
	602	bxne lr
	603	sub r2, r0, #0x58
	604	cmp r2, #0x10
	605	bhs s68k_reg_write8
	606	bic r0, r0, #1
	607	orr r1, r1, r1, lsl #8
	608	b gfx_cd_write16
4ff2d527	609
	610
	611	m_s68k_write8_pcm:
0ace9b9a	612	tst r0, #0x8000
0ace9b9a	613	bxne lr
4ff2d527	614	bic r0, r0, #0xff0000
	615	cmp r0, #0x12
	616	movlt r0, r0, lsr #1
	617	blt pcm_write
	618
	619	cmp r0, #0x2000
	620	bxlt lr
	621
	622	m_s68k_write8_pcm_ram:
	623	ldr r3, =(Pico+0x22200)
	624	bic r0, r0, #0x00e000
	625	ldr r3, [r3]
	626	mov r0, r0, lsr #1
	627	add r2, r3, #0x110000
	628	add r2, r2, #0x002200
	629	add r2, r2, #0x000040
	630	ldr r2, [r2]
	631	add r3, r3, #0x100000 @ pcm_ram
	632	and r2, r2, #0x0f000000 @ bank
	633	add r3, r3, r2, lsr #12
	634	strb r1, [r3, r0]
	635	bx lr
	636
	637
4ff2d527	638	@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
	639
	640
0ace9b9a	641	.macro m_s68k_write16_2M_decode
48e8482f	642	ldr r2, =(Pico+0x22200)
	643	eor r0, r0, #2
	644	ldr r2, [r2]
	645	mov r0, r0, lsr #1 @ +4-6 <<16
0ace9b9a	646	add r2, r2, r3 @ map to our address
48e8482f	647	.endm
48e8482f	648
0ace9b9a	649	PicoWriteS68k16_dec_m0b0:
	650	mov r3, #0x080000
	651	b 0f
	652
	653	PicoWriteS68k16_dec_m0b1:
	654	mov r3, #0x0a0000
	655	0:
	656	m_s68k_write16_2M_decode
48e8482f	657	bic r1, r1, #0xf0
	658	orr r1, r1, r1, lsr #4
	659	strb r1, [r2, r0]
	660	bx lr
48e8482f	661
0ace9b9a	662	PicoWriteS68k16_dec_m1b0: @ underwrite
	663	mov r3, #0x080000
	664	b 0f
	665
	666	PicoWriteS68k16_dec_m1b1:
	667	mov r3, #0x0a0000
	668	0:
48e8482f	669	bics r1, r1, #0xf000
	670	bicnes r1, r1, #0x00f0
	671	bxeq lr
	672	orr r1, r1, r1, lsr #4
0ace9b9a	673	m_s68k_write16_2M_decode
48e8482f	674	ldrb r0, [r2, r0]!
	675	and r3, r1, #0x0f
	676	and r1, r1, #0xf0
	677	tst r0, #0x0f
	678	orreq r0, r0, r3
	679	tst r0, #0xf0
	680	orreq r0, r0, r1
	681	strb r0, [r2]
	682	bx lr
48e8482f	683
0ace9b9a	684	PicoWriteS68k16_dec_m2b0: @ overwrite
	685	mov r3, #0x080000
	686	b 0f
	687
	688	PicoWriteS68k16_dec_m2b1:
	689	mov r3, #0x0a0000
	690	0:
48e8482f	691	bics r1, r1, #0xf000
	692	bicnes r1, r1, #0x00f0
	693	bxeq lr
	694	orr r1, r1, r1, lsr #4
0ace9b9a	695	m_s68k_write16_2M_decode
48e8482f	696	ldrb r0, [r2, r0]!
	697	ands r3, r1, #0x0f
	698	andne r0, r0, #0xf0
	699	orrne r0, r0, r3
	700	ands r1, r1, #0xf0
	701	andne r0, r0, #0x0f
	702	orrne r0, r0, r1
	703	strb r0, [r2]
	704	bx lr
48e8482f	705
4ff2d527	706
0ace9b9a	707	PicoWriteS68k16_pr:
	708	and r2, r0, #0xfe00
	709	cmp r2, #0x8000
	710	bne m_s68k_write8_pcm
4ff2d527	711
	712	m_s68k_write16_regs:
	713	bic r0, r0, #0xff0000
	714	bic r0, r0, #0x008000
5c69a605	715	bic r0, r0, #1
4ff2d527	716	tst r0, #0x7e00
	717	movne r0, #0
	718	bxne lr
5c69a605	719	cmp r0, #0x0e
5c69a605	720	beq m_s68k_write16_regs_spec
4ff2d527	721	sub r2, r0, #0x58
4ff2d527	722	cmp r2, #0x10
5c69a605	723	blo gfx_cd_write16
4ff2d527	724	and r3, r1, #0xff
4ff2d527	725	add r2, r0, #1
4ff2d527	726	stmfd sp!,{r2,r3,lr}
	727	mov r1, r1, lsr #8
	728	bl s68k_reg_write8
	729	ldmfd sp!,{r0,r1,lr}
	730	b s68k_reg_write8
	731
5c69a605	732	m_s68k_write16_regs_spec: @ special case
	733	ldr r2, =(Pico+0x22200)
	734	mov r0, #0x110000
	735	ldr r2, [r2]
	736	add r0, r0, #0x00000f
	737	strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0xf] = d;
48e8482f	738	bx lr
4ff2d527	739
0ace9b9a	740	.pool
6cadc2da	741
cff531af	742	@ vim:filetype=armasm