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federicogramosfedericogramos
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vesa2uefi nueva fun
1 parent 090ce1a commit 38186d4

5 files changed

Lines changed: 118 additions & 47 deletions

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‎asm/bios/mbr.asm‎

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@@ -323,53 +323,6 @@ a20_check:
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ret
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;;==============================================================================
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;; vesa |
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;;==============================================================================
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;; No me gusta esta fun definida aqui y llamada en start. Luego veo que hacer.
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;; Esto es transitorio por cuestiones de espacio.
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;;==============================================================================
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vesa:
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mov cx, 0x4000 - 1 ; Start looking from here
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.vbe_search:
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inc cx
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mov bx, cx ; Mode is saved to BX for the set command later
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cmp cx, 0x5000
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;;TO-DO: falta load mensaje error.
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je failure
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mov edi, VBEModeInfoBlock ; VBE data will be stored at this address
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mov ax, 0x4F01 ; VESA SuperVGA BIOS - GET SuperVGA MODE INFORMATION - http://www.ctyme.com/intr/rb-0274.htm
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int 0x10
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cmp ax, 0x004F ; Return value in AX should equal 0x004F if command supported and successful
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jne .vbe_search ; Try next mode
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cmp byte [VBEModeInfoBlock.BitsPerPixel], 32 ; Desired bit depth
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jne .vbe_search ; If not equal, try next mode
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cmp word [VBEModeInfoBlock.XResolution], Horizontal_Resolution ; Desired XRes here
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jne .vbe_search
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cmp word [VBEModeInfoBlock.YResolution], Vertical_Resolution ; Desired YRes here
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jne .vbe_search
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or bx, 0x4000 ; Use linear/flat frame buffer model (set bit 14)
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mov ax, 0x4F02 ; VESA SuperVGA BIOS - SET SuperVGA VIDEO MODE - http://www.ctyme.com/intr/rb-0275.htm
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int 0x10
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cmp ax, 0x004F ; Return value in AX should equal 0x004F if supported and successful
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;;TO-DO: falta load mensaje error.
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jne failure
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ret
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;;==============================================================================
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;; section .data
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;;==============================================================================

‎asm/bios/start16.asm‎

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@@ -35,6 +35,10 @@ extern tmpGDTR64 ;; Only for bios boot. See tsl.asm 1178 TO-DO.
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extern SYS64_CODE_SEL
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;;==============================================================================
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;;
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;;==============================================================================
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BITS 16
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start16:

‎asm/lib/bios.asm‎

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Original file line numberDiff line numberDiff line change
@@ -5,3 +5,117 @@
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;;==============================================================================
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;; vesa |
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;;==============================================================================
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;; No me gusta esta fun definida aqui y llamada en start. Luego veo que hacer.
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;; Esto es transitorio por cuestiones de espacio.
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;;==============================================================================
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vesa:
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mov cx, 0x4000 - 1 ; Start looking from here
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.vbe_search:
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inc cx
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mov bx, cx ; Mode is saved to BX for the set command later
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cmp cx, 0x5000
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;;TO-DO: falta load mensaje error.
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je failure
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mov edi, VBEModeInfoBlock ; VBE data will be stored at this address
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mov ax, 0x4F01 ; VESA SuperVGA BIOS - GET SuperVGA MODE INFORMATION - http://www.ctyme.com/intr/rb-0274.htm
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int 0x10
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cmp ax, 0x004F ; Return value in AX should equal 0x004F if command supported and successful
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jne .vbe_search ; Try next mode
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cmp byte [VBEModeInfoBlock.BitsPerPixel], 32 ; Desired bit depth
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jne .vbe_search ; If not equal, try next mode
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cmp word [VBEModeInfoBlock.XResolution], Horizontal_Resolution ; Desired XRes here
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jne .vbe_search
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cmp word [VBEModeInfoBlock.YResolution], Vertical_Resolution ; Desired YRes here
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jne .vbe_search
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or bx, 0x4000 ; Use linear/flat frame buffer model (set bit 14)
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mov ax, 0x4F02 ; VESA SuperVGA BIOS - SET SuperVGA VIDEO MODE - http://www.ctyme.com/intr/rb-0275.htm
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int 0x10
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cmp ax, 0x004F ; Return value in AX should equal 0x004F if supported and successful
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;;TO-DO: falta load mensaje error.
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jne failure
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ret
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;;==============================================================================
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;; vesa2uefi | pasa info de vesa a tabla para compatibilidad con uefi
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;;==============================================================================
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;; Video info pasado de bios. Difiere de uefi, por lo que se formatea para dejar
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;; las igual.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;==============================================================================
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vesa2uefi:
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; Save the frame buffer address, size (after its calculated), and the screen x,y
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xor eax, eax
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xor ebx, ebx
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mov ax, [0x5F00 + 16] ; BytesPerScanLine (modo vesa)
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push eax
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mov bx, [0x5F00 + 16 + 2 * 2] ; YResolution (vesa)
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push ebx
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mov ax, [0x5F00 + 16 + 2] ; XResolution (vesa)
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push eax
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mul ebx
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mov ecx, eax
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shl ecx, 2 ; Quick multiply by 4
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;; aqui en bios, deja las cosas en el mismo orden que uefi
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;[0x00005F00] ; Frame buffer base
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;;;[0x00005F08] ; Frame buffer size (bytes)
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;;;[0x00005F10] ; Screen X
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;;;;[0x00005F12] ; Screen Y
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;;;;[0x00005F14] ; PixelsPerScanLine
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;;;;; recontramega importante (para bios, no uefi), aqui va a colocar
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mov edi, 0x5F00
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mov eax, [0x5F00 + 40];;;; ya que para bios, el vbeinfoblock tiene esta estructura (framebuffer en +40)
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stosd ; 64-bit Frame Buffer Base (low)
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;;;;;;;; y pasandolo aqui 0x5f00 esta unificando un vbeInfoblock con estructura nueva tanto
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;;;;;;;; para efi como para bios
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xor eax, eax
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stosd ; 64-bit Frame Buffer Base (high) completa qword
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mov eax, ecx
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stosd ; 64-bit Frame Buffer Size in bytes (low)
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xor eax, eax
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stosd ; 64-bit Frame Buffer Size in bytes (high)
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pop eax
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stosw ; 16-bit Screen X
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pop eax
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stosw ; 16-bit Screen Y
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pop eax
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shr eax, 2 ; 4 bytes / px => bpsl/4
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stosw ; PixelsPerScanLine
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mov eax, 32
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stosw ; BitsPerPixel
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; Clear memory for the Page Descriptor Entries (0x10000 - 0x5FFFF)
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mov edi, 0x00210000
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mov ecx, 81920
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rep stosd ; Write 320KiB
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ret
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‎obj/mbr.o‎

32 Bytes
Binary file not shown.

‎out/mbr.sys‎

9 Bytes
Binary file not shown.

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