Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-04-25 08:00:24 +00:00
Code Issues Projects Releases Packages Wiki Activity

[FREELDR:PC98] Don't do the HighRes check everytime a character is written with writechr (#4359)

Browse source 
And bring similar simplifications to the PC98 FAT12 bootsector.

Co-authored-by: Dmitry Borisov <di.sean@protonmail.com>
This commit is contained in:
Hermès Bélusca-Maïto 2022-02-12 15:59:27 +01:00
parent 94a650cdf7
commit a3899d8151
No known key found for this signature in database
GPG key ID: 3B2539C65E7B93D0
2 changed files with 34 additions and 25 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
boot/freeldr/bootsect/pc98/fat12fdd.S
View file

@ -145,11 +145,9 @@ relocated:
mov ds, ax
test byte ptr ds:[HEX(501)], HEX(08) // High-resolution mode check
jz VideoTestNormalMode
mov ax, HEX(0E000)
jmp short VideoTestDone
VideoTestNormalMode:
mov ax, HEX(0A000)
mov ax, HEX(0A000) // Suppose normal mode
jz short VideoTestDone
mov ah, HEX(E0) // Change 0xA000 to 0xE000, use hi-res mode
VideoTestDone:
mov word ptr BP_REL(VramSegment), ax
@ -360,14 +358,11 @@ PutChar:
push di
push es
push word ptr BP_REL(VramSegment)
pop es
mov di, word ptr BP_REL(VramOffset) // ES:DI = VramSegment:VramOffset
les di, dword ptr BP_REL(VramSegOff) // Load the VRAM segment and offset (ES:DI)
.PutCharWrite:
xor ah, ah
stosw // Write ASCII directly to the VRAM
mov word ptr BP_REL(VramOffset), di
xor ah, ah // Write ASCII directly to the VRAM
stosw // (two bytes per character)
mov word ptr BP_REL(VramOffset), di // Update the start position
pop es
pop di
@ -470,10 +465,12 @@ Reboot:
Halt:
jmp short Halt // Spin
VramSegment:
.word 0
VramSegOff:
VramOffset:
.word 0
VramSegment:
.word 0
msgDiskError:
.ascii "ERR", CR, LF, NUL
msgNotFoundError:

34
boot/freeldr/freeldr/arch/realmode/helpers_pc98.inc
View file

@ -56,12 +56,12 @@ writestr:
jmp short .writestr_loop
.writestr_cr:
mov ax, word ptr VramOffset
mov ax, word ptr ds:[VramOffset]
mov dl, 80 * 2
div dl
inc ax
mul dl
mov word ptr VramOffset, ax
mov word ptr ds:[VramOffset], ax
/* Skip the next LF character */
inc si
@ -80,27 +80,39 @@ writechr:
pushf
pusha
/* Check if the VRAM segment was initialized */
mov dx, word ptr ds:[VramSegment]
test dx, dx
jnz short .writechr_write
/* High-resolution mode check */
test byte ptr ds:[HEX(501)], HEX(08)
jz .writechr_normal
push HEX(0E000)
jmp short .writechr_test_done
.writechr_normal:
push HEX(0A000)
mov dx, HEX(0A000) // Suppose normal mode
jz short .writechr_test_done
mov dh, HEX(E0) // Change 0xA000 to 0xE000, use hi-res mode
.writechr_test_done:
pop es
mov di, word ptr VramOffset
mov word ptr ds:[VramSegment], dx
.writechr_write:
/* Load the VRAM segment and offset (ES:DI) */
les di, dword ptr ds:[VramSegOff]
/* Write ASCII directly to the VRAM (two bytes per character) */
xor ah, ah
stosw
mov word ptr VramOffset, di
/* Update the start position */
mov word ptr ds:[VramOffset], di
popa
popf
ret
VramSegOff:
VramOffset:
.word 0
VramSegment:
.word 0
/*
* Writes a hex number in (AL, AX, EAX) to the console