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Revise KStart16 framebuffer acquire logic.

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This commit is contained in:
TomAwezome 2022-08-26 20:55:55 -04:00
parent aa167cdb22
commit 33bf00ea5c
1 changed files with 28 additions and 14 deletions
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42
src/Kernel/KStart16.ZC
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@ -60,14 +60,13 @@ SYS_SMBIOS_ENTRY:: DU64 0;
#assert $$ - SYS_KERNEL == sizeof(CKernel) - sizeof(CZXE)
TEMP_VBE_MODE: DU8 sizeof(CVBEMode) DUP(0);
MAX_VBE_MODE: DU8 sizeof(CVBEModeShort) DUP(0);
MAX_SCREEN_HEIGHT: DU16 0;
VBE_INFO: DU8 sizeof(CVBEInfo) DUP(0);
VBE_MODES: DU8 sizeof(CVBEModeShort) * VBE_MODES_NUM DUP(0);
VBE_FINAL_MODE: DU8 sizeof(CVBEMode) DUP(0);
VBE_FINAL_MODE_NUM: DU16 0; //mode number of final mode set
REQUESTED_SCREEN_WIDTH: DU16 1920;
REQUESTED_SCREEN_HEIGHT: DU16 1080;
VBE_TEMP_MODE: DU8 sizeof(CVBEMode) DUP(0);
VBE_INFO: DU8 sizeof(CVBEInfo) DUP(0);
VBE_FINAL_MODE_NUM: DU16 0; // gets set to final result mode number
VBE_STD_MODE_NUM: DU16 0; // gets set to mode number for standard 1024x768
//************************************
CORE0_16BIT_INIT::
@ -114,7 +113,6 @@ GET_IP: POP BX
/*Loop variables:
DI <- Temporary storage for mode information
CX <- Mode number
DX <- mode array
GS <- Segment for video modes list
SI <- Offset for video modes list
*/
@ -122,8 +120,7 @@ GET_IP: POP BX
MOV AX, VBE_INFO
MOV SI, CVBEInfo.video_modes[AX]
MOV GS, CVBEInfo.video_modes+2[AX]
MOV DI, TEMP_VBE_MODE
MOV DX, VBE_MODES
MOV DI, VBE_TEMP_MODE
@@15: //Loop through all the mode numbers
MOV AX, GS:[SI]
@ -144,7 +141,7 @@ GET_IP: POP BX
CMP AX, 0x004F
JNE @@15 //if call to get mode information failed
//filter everything but 32-bit color
//Filter everything but 32-bit color
MOV AL, CVBEMode.bpp[DI]
CMP AL, 32
JNE @@15
@ -167,9 +164,17 @@ GET_IP: POP BX
@@20: MOV AX, CVBEMode.width[DI]
//Check if width and height match standard 1024x768
//If they match, set VBE_STD_MODE_NUM to this mode num
CMP AX, 1024
JNE @@15
JNE @@23
CMP BX, 768
JNE @@23
MOV [VBE_STD_MODE_NUM], CX
//Check if width and height match requested resolution
@@23: CMP AX, [REQUESTED_SCREEN_WIDTH]
JNE @@15
CMP BX, [REQUESTED_SCREEN_HEIGHT]
JNE @@15
//If we've made it here we have our mode
@ -178,11 +183,20 @@ GET_IP: POP BX
@@25: //End of loop
//If requested resolution wasn't found in VBE mode list,
//use the standard 1024x768 mode as fallback
MOV AX, [VBE_FINAL_MODE_NUM]
CMP AX, 0
JNE @@30
MOV CX, [VBE_STD_MODE_NUM]
MOV [VBE_FINAL_MODE_NUM], CX
@@30: PUSH ES
PUSH DS
POP ES
//Get mode infomration for the mode we want
MOV DI, VBE_FINAL_MODE
//Get mode information for the mode we want
MOV DI, VBE_TEMP_MODE
MOV CX, [VBE_FINAL_MODE_NUM]
MOV AX, 0x4F01
INT 0x10