Hardware/Espresso Registers: Difference between revisions

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OSScreen reverse engineering
Add framebuffer registers
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{{Infobox MMIO
{{Infobox MMIO
| arm = ??
| arm = Full
| ppc = ??
| ppc = Full
| base = 0x0C000000
| base = 0x0C000000
| len = 0x400000
| len = 0x400000
Line 14: Line 14:
{{reglist|Espresso Registers}}
{{reglist|Espresso Registers}}
{{rld|0x0C206084|32|FB0_STATE|Controls TV framebuffer state.|drs=1}}
{{rld|0x0C206084|32|FB0_STATE|Controls TV framebuffer state.|drs=1}}
{{rld|0x0C206100|32|FB0_MODE_UPDATE|Update flag for TV framebuffer mode register.|drs=1}}
{{rld|0x0C206100|32|FB0_MODE_UPDATE|Update flag for TV framebuffer mode register.{{check}}|drs=1}}
{{rld|0x0C206104|32|FB0_MODE|Controls TV framebuffer mode.|drs=1}}
{{rld|0x0C206104|32|FB0_MODE|Controls TV framebuffer mode.|drs=1}}
{{rld|0x0C206110|32|FB0_ADDR|Physical memory location of TV framebuffer.|drs=1}}
{{rld|0x0C206110|32|FB0_ADDR|Physical memory location of TV framebuffer.|drs=1}}
{{rld|0x0C206120|32|FB0_WIDTH1|Width of TV framebuffer.|drs=2}}
{{rld|0x0C206120|32|FB0_WIDTH1|Width of TV framebuffer.|drs=2}}
{{rld|0x0C206198|32|FB0_WIDTH2}}
{{rld|0x0C206198|32|FB0_WIDTH2}}
{{rld|0x0C206914|32|FB0_ADDR_UPDATE|Update flag for TV framebuffer (contested)|drs=1}}
{{rld|0x0C206914|32|FB0_ADDR_UPDATE|Update flag for TV framebuffer.{{check}}|drs=1}}
{{rld|0x0C207084|32|FB1_STATE|Controls TV framebuffer state.|drs=1}}
{{rld|0x0C207100|32|FB1_MODE_UPDATE|Update flag for TV framebuffer mode register.{{check}}|drs=1}}
{{rld|0x0C207104|32|FB1_MODE|Controls TV framebuffer mode.|drs=1}}
{{rld|0x0C207110|32|FB1_ADDR|Physical memory location of TV framebuffer.|drs=1}}
{{rld|0x0C207120|32|FB1_WIDTH1|Width of TV framebuffer.|drs=2}}
{{rld|0x0C207198|32|FB1_WIDTH2}}
{{rld|0x0C207914|32|FB1_ADDR_UPDATE|Update flag for TV framebuffer.{{check}}|drs=1}}
|}
|}
==Framebuffer Registers==
{{reg32|FB''x''_STATE|addr=0x0C206084/0x0C207084|hifields=1|lofields=3|
|16      |
|U      |
|        ||
|7|1  |8|
|U|RW  |U|
| |DSBL| |
}}
{{regdesc
|DSBL|Set to ''disable'' the buffer, and clear to ''enable'' it.
}}
{{reg32|FB''x''_MODE_UPDATE|addr=0x0C206100/0x0C207100|hifields=1|lofields=2|
|16    |
|U    |
|      ||
|15|1  |
|U |W  |
|  |UPD|
}}
{{regdesc
|UPD|Must be set directly after '''FB''x''_MODE''' changes.{{check}}
}}
This register is assumed to be an update flag{{check}} due to its proximity to '''FB''x''_MODE''' writes.
{{reg32|FB''x''_MODE|addr=0x0C206104/0x0C207104|hifields=3|lofields=4|
|8  |4    |4  |
|U  |RW  |U  |
|  |UNK1 |  ||
|5|3  |6|2  |
|U|RW  |U|RW  |
| |UNK2| |UNK3|
}}
{{regdesc
|UNK1|Unknown. Bit 20 (0x100000) set during OSScreen initialisation.
|UNK2|Unknown. All bits cleared during OSScreen initialisation.
|UNK3|Unknown. Bit 1 (0x2) set during OSScreen initialisation.
}}
A simplified view of how OSScreen sets up this register is as follows:
<syntaxhighlight lang="c">
*FBx_MODE = (*FBx_MODE & 0xFF0FF8FC) | 0x100002;
</syntaxhighlight>
{{reg32|FB''x''_ADDR|addr=0x0C206110/0x0C207110|hifields=1|lofields=3|
|16        |
|W        |
|ADDR      ||
|8  |7|1  |
|W  |U|W  |
|ADDR| |UNK|
}}
{{regdesc
|ADDR|High 24 bits of physical address for displayed framebuffer.
|UNK |Unknown. Set during OSScreen initialisation.
}}
{{reg32|FB''x''_WIDTH''x''|addr=0x0C206120/0x0C206198/0x0C207120/0x0C207198|hifields=1|lofields=2|
|16  |
|U  |
|    ||
|2|14|
|U|W |
| |PX|
}}
{{regdesc
|PX|Target width of framebuffer in pixels.
}}
It's not known why there appears to be two of these registers for each framebuffer. OSScreen writes an identical value to each.
{{reg32|FB''x''_ADDR_UPDATE|addr=0x0C206914/0x0C207914|hifields=1|lofields=1|
|16    |
|U    |
|      ||
|16    |
|U    |
|      |
}}
{{regdesc
|FB''x''_ADDR_UPDATE|All bits cleared during OSScreen initialisation.
}}
This register is assumed to be an update flag{{check}} due to its proximity to '''FB''x''_ADDR''' writes.

Revision as of 12:54, 11 July 2017

This Hardware-related article is a stub. You can help WiiUBrew by expanding it.
Espresso Registers
Access
EspressoFull
StarbuckFull
Registers
Base0x0C000000
Length0x400000
Access size32 bits
Byte orderBig Endian
IRQs
Espresso??
Latte??
This box: view • talk • edit

Register List

Espresso Registers
Address Bits Name Description
0x0C206084 32 FB0_STATE Controls TV framebuffer state.
0x0C206100 32 FB0_MODE_UPDATE Update flag for TV framebuffer mode register.[check]
0x0C206104 32 FB0_MODE Controls TV framebuffer mode.
0x0C206110 32 FB0_ADDR Physical memory location of TV framebuffer.
0x0C206120 32 FB0_WIDTH1 Width of TV framebuffer.
0x0C206198 32 FB0_WIDTH2
0x0C206914 32 FB0_ADDR_UPDATE Update flag for TV framebuffer.[check]
0x0C207084 32 FB1_STATE Controls TV framebuffer state.
0x0C207100 32 FB1_MODE_UPDATE Update flag for TV framebuffer mode register.[check]
0x0C207104 32 FB1_MODE Controls TV framebuffer mode.
0x0C207110 32 FB1_ADDR Physical memory location of TV framebuffer.
0x0C207120 32 FB1_WIDTH1 Width of TV framebuffer.
0x0C207198 32 FB1_WIDTH2
0x0C207914 32 FB1_ADDR_UPDATE Update flag for TV framebuffer.[check]

Framebuffer Registers

FBx_STATE (0x0C206084/0x0C207084)
  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Access U
Field
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U RW U
Field DSBL
Field Description
DSBL Set to disable the buffer, and clear to enable it.


FBx_MODE_UPDATE (0x0C206100/0x0C207100)
  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Access U
Field
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U W
Field UPD
Field Description
UPD Must be set directly after FBx_MODE changes.[check]

This register is assumed to be an update flag[check] due to its proximity to FBx_MODE writes.


FBx_MODE (0x0C206104/0x0C207104)
  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Access U RW U
Field UNK1
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U RW U RW
Field UNK2 UNK3
Field Description
UNK1 Unknown. Bit 20 (0x100000) set during OSScreen initialisation.
UNK2 Unknown. All bits cleared during OSScreen initialisation.
UNK3 Unknown. Bit 1 (0x2) set during OSScreen initialisation.

A simplified view of how OSScreen sets up this register is as follows: 

*FBx_MODE = (*FBx_MODE & 0xFF0FF8FC) | 0x100002;


FBx_ADDR (0x0C206110/0x0C207110)
  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Access W
Field ADDR
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access W U W
Field ADDR UNK
Field Description
ADDR High 24 bits of physical address for displayed framebuffer.
UNK Unknown. Set during OSScreen initialisation.


FBx_WIDTHx (0x0C206120/0x0C206198/0x0C207120/0x0C207198)
  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Access U
Field
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U W
Field PX
Field Description
PX Target width of framebuffer in pixels.

It's not known why there appears to be two of these registers for each framebuffer. OSScreen writes an identical value to each.


FBx_ADDR_UPDATE (0x0C206914/0x0C207914)
  31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Access U
Field
  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access U
Field
Field Description
FBx_ADDR_UPDATE All bits cleared during OSScreen initialisation.

This register is assumed to be an update flag[check] due to its proximity to FBx_ADDR writes.

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