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Make the IO port base a define.

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This commit is contained in:
Matthieu Bucchianeri
2025-02-10 18:37:59 -08:00
parent 38438e7d8b
commit c768ae500d
1 changed files with 26 additions and 21 deletions
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47
XTMax/Drivers/BootROM/bootrom.asm
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@@ -11,6 +11,11 @@ cpu 8086 ; ensure we remain compatible with 8086
;%define DEBUG_IO
;%define EXTRA_DEBUG
;
; The base I/O port for the XTMAX SD Card.
;
%define XTMAX_IO_BASE (0x280)
%define FIXED_DISK_0 (0)
%define FIXED_DISK_1 (1)
@@ -105,9 +110,9 @@ entry:
mov ax, string_io_msg
call print_string
.store_string_io:
mov ax, 0x283 ; scratch register 0
mov ax, XTMAX_IO_BASE+3 ; scratch register 0
xchg ax, dx
out dx, al ; save capability
out dx, al ; save capability
%ifndef AS_COM_PROGRAM
;
@@ -121,13 +126,13 @@ entry:
mov es, ax
mov ax, es:[0x13*4+2]
mov dx, 0x284 ; scratch register 1-2
mov dx, XTMAX_IO_BASE+4 ; scratch register 1-2
out dx, ax ; save segment
call print_hex
mov ax, colon
call print_string
mov ax, es:[0x13*4]
mov dx, 0x286 ; scratch register 3-4
mov dx, XTMAX_IO_BASE+6 ; scratch register 3-4
out dx, ax ; save offset
call print_hex
mov ax, newline
@@ -232,14 +237,14 @@ int13h_entry:
; Simulate INT 13h with the original vector.
;
pushf ; setup for iret below
mov dx, 0x284 ; scratch register 1-2
mov dx, XTMAX_IO_BASE+4 ; scratch register 1-2
%ifndef AS_COM_PROGRAM
in ax, dx
%else
mov ax, cs
%endif
push ax ; setup for iret below
mov dx, 0x286 ; scratch register 3-4
mov dx, XTMAX_IO_BASE+6 ; scratch register 3-4
%ifndef AS_COM_PROGRAM
in ax, dx
%else
@@ -449,7 +454,7 @@ func_02_read_sector:
xor ch, ch
mov di, bx ; setup use of stosw
.assert_cs:
mov dx, 0x282 ; chip select port
mov dx, XTMAX_IO_BASE+2 ; chip select port
mov al, 0 ; assert chip select
out dx, al
.cmd17:
@@ -468,7 +473,7 @@ func_02_read_sector:
mov ax, wait_msg
call print_string
%endif
mov dx, 0x280 ; data port
mov dx, XTMAX_IO_BASE+0 ; data port
mov cx, 50000 ; timeout (50ms)
jmp .receive_token_no_delay
.receive_token:
@@ -484,7 +489,7 @@ func_02_read_sector:
%endif
mov cx, 256 ; block size (in words)
push dx
mov dx, 0x283 ; scratch register 0
mov dx, XTMAX_IO_BASE+3 ; scratch register 0
in al, dx
pop dx
test al, al ; supports insw?
@@ -507,7 +512,7 @@ cpu 8086
loop .cmd17
.success:
.deassert_cs1:
mov dx, 0x282 ; chip select port
mov dx, XTMAX_IO_BASE+2 ; chip select port
mov al, 1 ; deassert chip select
out dx, al
.return1:
@@ -519,7 +524,7 @@ cpu 8086
jmp succeeded
.error:
.deassert_cs2:
mov dx, 0x282 ; chip select port
mov dx, XTMAX_IO_BASE+2 ; chip select port
mov al, 1 ; deassert chip select
out dx, al
.return2:
@@ -578,7 +583,7 @@ func_03_write_sector:
mov ax, es
mov ds, ax
.assert_cs:
mov dx, 0x282 ; chip select port
mov dx, XTMAX_IO_BASE+2 ; chip select port
mov al, 0 ; assert chip select
out dx, al
.cmd24:
@@ -593,13 +598,13 @@ func_03_write_sector:
mov cl, 0x58 ; CMD24
call send_sd_read_write_cmd
jc .error
mov dx, 0x280 ; data port
mov dx, XTMAX_IO_BASE+0 ; data port
mov al, 0xfe ; send token
out dx, al
mov cx, 256 ; block size (in words)
xchg di, si ; save si (aka TEMP1)
push dx
mov dx, 0x283 ; scratch register 0
mov dx, XTMAX_IO_BASE+3 ; scratch register 0
in al, dx
pop dx
test al, al ; supports outsw?
@@ -671,7 +676,7 @@ cpu 8086
%endif
.success:
.deassert_cs1:
mov dx, 0x282 ; chip select port
mov dx, XTMAX_IO_BASE+2 ; chip select port
mov al, 1 ; deassert chip select
out dx, al
.return1:
@@ -684,7 +689,7 @@ cpu 8086
jmp succeeded
.error:
.deassert_cs2:
mov dx, 0x282 ; chip select port
mov dx, XTMAX_IO_BASE+2 ; chip select port
mov al, 1 ; deassert chip select
out dx, al
.return2:
@@ -940,21 +945,21 @@ init_sd:
mov ax, ROM_SEGMENT
mov ds, ax
%endif
mov dx, 0x282 ; chip select port
mov dx, XTMAX_IO_BASE+2 ; chip select port
mov al, 1 ; deassert chip select
out dx, al
xor cx, cx
mov dx, 1000 ; microseconds
mov ah, 0x86 ; wait
int 0x15
mov dx, 0x280 ; data port
mov dx, XTMAX_IO_BASE+0 ; data port
mov al, 0xff
mov cx, 80 ; send 80 clock cycles
.synchronize:
out dx, al
loop .synchronize
.assert_cs:
mov dx, 0x282 ; chip select port
mov dx, XTMAX_IO_BASE+2 ; chip select port
mov al, 0 ; assert chip select
out dx, al
.cmd0:
@@ -1034,7 +1039,7 @@ init_sd:
; FL = <TRASH>
;
send_sd_init_cmd:
mov dx, 0x280 ; data port
mov dx, XTMAX_IO_BASE+0 ; data port
.settle_before:
mov al, 0xff
out dx, al
@@ -1083,7 +1088,7 @@ acmd41 db 0x69, 0x40, 0x00, 0x00, 0x00, 0x01
; FL = <TRASH>
;
send_sd_read_write_cmd:
mov dx, 0x280 ; data port
mov dx, XTMAX_IO_BASE+0 ; data port
push ax
.settle_before:
mov al, 0xff