Changeset 1496f87 in mainline for kernel/arch/ia32/src/boot/vesa_real.inc

Timestamp:

2009-03-18T16:26:01Z (15 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

eada065e

Parents:

7dfc120a

Message:

properly detect VESA 16 bpp modes with 5:5:5 colors

File:

• kernel/arch/ia32/src/boot/vesa_real.inc (modified) (2 diffs)

kernel/arch/ia32/src/boot/vesa_real.inc

@@ -5 +5 @@
 #define VESA_INFO_SIZE 1024
 
-#define VESA_MODE_ATTRIBUTES_OFFSET 0
-#define VESA_MODE_LIST_PTR_OFFSET 14
-#define VESA_MODE_SCANLINE_OFFSET 16
-#define VESA_MODE_WIDTH_OFFSET 18
-#define VESA_MODE_HEIGHT_OFFSET 20
-#define VESA_MODE_BPP_OFFSET 25
-#define VESA_MODE_PHADDR_OFFSET 40
-
-#define VESA_END_OF_MODES 0xffff
-
-#define VESA_OK 0x4f
-
-#define VESA_GET_INFO 0x4f00
-#define VESA_GET_MODE_INFO 0x4f01
-#define VESA_SET_MODE 0x4f02
-#define VESA_SET_PALETTE 0x4f09
+#define VESA_MODE_ATTRIBUTES_OFFSET  0
+#define VESA_MODE_LIST_PTR_OFFSET    14
+#define VESA_MODE_SCANLINE_OFFSET    16
+#define VESA_MODE_WIDTH_OFFSET       18
+#define VESA_MODE_HEIGHT_OFFSET      20
+#define VESA_MODE_BPP_OFFSET         25
+#define VESA_MODE_RED_MASK_OFFSET    31
+#define VESA_MODE_RED_POS_OFFSET     32
+#define VESA_MODE_GREEN_MASK_OFFSET  33
+#define VESA_MODE_GREEN_POS_OFFSET   34
+#define VESA_MODE_BLUE_MASK_OFFSET   35
+#define VESA_MODE_BLUE_POS_OFFSET    36
+#define VESA_MODE_PHADDR_OFFSET      40
+
+#define VESA_END_OF_MODES  0xffff
+
+#define VESA_OK  0x4f
+
+#define VESA_GET_INFO       0x4f00
+#define VESA_GET_MODE_INFO  0x4f01
+#define VESA_SET_MODE       0x4f02
+#define VESA_SET_PALETTE    0x4f09
 
 .code32
@@ -278 +284 @@
                 vga_not_set:
                 
-                mov VESA_MODE_PHADDR_OFFSET(%di), %esi
-                mov VESA_MODE_WIDTH_OFFSET(%di), %ax
+                # store mode parameters
+                #  eax = bpp[8] scanline[16]
+                #  ebx = width[16]  height[16]
+                #  edx = red_mask[8] red_pos[8] green_mask[8] green_pos[8]
+                #  esi = blue_mask[8] blue_pos[8]
+                #  edi = linear frame buffer
+                
+                mov VESA_MODE_BPP_OFFSET(%di), %al
+                xor %ah, %ah
                 shl $16, %eax
-                mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
-                mov VESA_MODE_BPP_OFFSET(%di), %bl
-                xor %bh, %bh
+                mov VESA_MODE_SCANLINE_OFFSET(%di), %ax
+                
+                mov VESA_MODE_WIDTH_OFFSET(%di), %bx
                 shl $16, %ebx
-                mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
-                mov %eax, %edi
+                mov VESA_MODE_HEIGHT_OFFSET(%di), %bx
+                
+                mov VESA_MODE_BLUE_MASK_OFFSET(%di), %dl
+                shl $8, %edx
+                mov VESA_MODE_BLUE_POS_OFFSET(%di), %dl
+                mov %edx, %esi
+                
+                mov VESA_MODE_RED_MASK_OFFSET(%di), %dl
+                shl $8, %edx
+                mov VESA_MODE_RED_POS_OFFSET(%di), %dl
+                shl $8, %edx
+                mov VESA_MODE_GREEN_MASK_OFFSET(%di), %dl
+                shl $8, %edx
+                mov VESA_MODE_GREEN_POS_OFFSET(%di), %dl
+                
+                mov VESA_MODE_PHADDR_OFFSET(%di), %edi
                 
                 vesa_leave_real:
                 
-                        mov %cr0, %eax
-                        or $1, %eax
-                        mov %eax, %cr0
+                        mov %cr0, %ecx
+                        or $1, %ecx
+                        mov %ecx, %cr0
                         
                         jmp vesa_leave_real2