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Some optimizations.

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This commit is contained in:
Matthieu Bucchianeri
2025-02-04 00:59:26 -08:00
committed by Ted Fried
parent 69647a6f9e
commit 9398846c13
2 changed files with 119 additions and 122 deletions
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45
XTMax/Drivers/BootROM/bootrom.asm
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@@ -276,7 +276,7 @@ int13h_entry:
mov TEMP1, dx ; save dx
pushf ; setup for iret from INT 13h handler
push cs ; setup for iret from INT 13h handler
mov ax, .return_from_int13h
mov ax, .return_common
push ax ; setup for iret from INT 13h handler
.simulate_int13h:
;
@@ -300,8 +300,7 @@ int13h_entry:
mov ax, TEMP0 ; restore ax
mov dx, TEMP1 ; restore dx
iret ; call the INT 13h handler
.return_from_int13h:
jmp .return_common
; will return at .return_common
;
; This is an operation for the SD Card. Use our own INT 13h logic.
@@ -327,19 +326,18 @@ int13h_entry:
mov TEMP1, .return
.call:
push TEMP1 ; setup for ret from the handler
push bx
mov TEMP1, bx ; save bx
mov bl, ah
xor bh, bh
shl bl, 1
mov TEMP1, bx
pop bx
xchg TEMP1, bx ; restore bx
jmp [cs:TEMP1+func_table]
.update_bda:
push es
mov TEMP0, es ; save es
mov TEMP1, 0x40 ; BIOS data area
mov es, TEMP1
mov es:[0x74], ah ; store HDSTAT
pop es
mov es, TEMP0 ; restore es
.return:
%ifdef DEBUG
push ax
@@ -365,12 +363,15 @@ int13h_entry:
.return_common:
mov TEMP0, sp
mov TEMP1, [TEMP0+8] ; grab the flags for iret
pushf
and TEMP1, 0xfffe ; clear carry
popf
adc TEMP1, 0 ; propagate carry
push TEMP1
jnc .return_success
popf
stc
jmp .return_with_flags
.return_success:
popf
clc
.return_with_flags:
pop TEMP1
pop TEMP0
%ifdef EXTRA_DEBUG
@@ -1200,18 +1201,14 @@ send_sd_read_write_cmd:
out dx, al
.send_cmd:
mov al, cl ; command byte
out dx, al
mov al, bh ; address byte 1
out dx, al
mov al, bl ; address byte 2
out dx, al
pop ax
xchg al, ah ; address byte 3
out dx, al
xchg al, ah ; address byte 4
out dx, al
mov al, 0x1 ; crc (dummy)
out dx, al
mov ah, bh ; address byte 1
out dx, ax
pop ax ; address byte 3
xchg al, bl ; address byte 2
out dx, ax
xchg al, bl ; address byte 4
mov ah, 0x1 ; crc (dummy)
out dx, ax
mov cx, 8 ; retries
.receive_r1:
in al, dx