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GPU/External Registers: Difference between revisions

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== Map ==
== Map ==
* 0x1EF00400 is the top screen
{| class="wikitable" border="1"
* 0x1EF00500 is the bottom screen
! User VA
! PA
! Length
! Name
! Comments
|-
| 0x1EF00004
| 0x14000004
| 4
| ?
|
|-
| 0x1EF00010
| 0x14000010
| 16
| MemoryFill1 (GX command 2)
|
|-
| 0x1EF00020
| 0x14000020
| 16
| MemoryFill2 (GX command 2)
|
|-
| 0x1EF00030
| 0x14000030
| 4
|
|
|-
| 0x1EF00400
| 0x14000400
| 0x100
| Top Screen Framebuffers
|
|-
| 0x1EF00500
| 0x14000500
| 0x100
| Bottom Screen Framebuffers
|
|}


== Init Values from nngxInitialize for Top Screen ==
== MemoryFill 0x1EF00010/0x1EF00020 ==
* 0x1EF00400 = 0x1C2
* 0x1EF00404 = 0xD1
* 0x1EF00408 = 0x1C1
* 0x1EF0040C = 0x1C1
* 0x1EF00410 = 0
* 0x1EF00414 = 0xCF
* 0x1EF00418 = 0xD1
* 0x1EF0041C = 0x1C501C1
* 0x1EF00420 = 0x10000
* 0x1EF00424 = 0x19D
* 0x1EF00428 = 2
* 0x1EF0042C = 0x1C2
* 0x1EF00430 = 0x1C2
* 0x1EF00434 = 0x1C2
* 0x1EF00438 = 1
* 0x1EF0043C = 2
* 0x1EF00440 = 0x1960192
* 0x1EF00444 = 0
* 0x1EF00448 = 0
* 0x1EF0045C = 0x19000F0
* 0x1EF00460 = 0x1c100d1
* 0x1EF00464 = 0x1920002
* 0x1EF00470 = 0x80340
* 0x1EF0049C = 0
 
== More Init Values from nngxInitialize for Top Screen ==
* 0x1EF00468 = 0x18300000, later changed by GSP module when updating state, framebuffer
* 0x1EF0046C = 0x18300000, later changed by GSP module when updating state, framebuffer
* 0x1EF00494 = 0x18300000
* 0x1EF00498 = 0x18300000
* 0x1EF00478 = 1, doesn't stay 1, read as 0
* 0x1EF00474 = 0x10501
 
== 0x1EF00010 ==
{| class="wikitable" border="1"
{| class="wikitable" border="1"
!  Register address
!  User VA
!  Description
!  Description
|-
|-
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These registers are used by [[GSP_Shared_Memory|GX command]] 2. 0x1EF00010 is used for the GX command buf0 parameters, while 0x1EF00020 is used for the GX command buf1 parameters.
These registers are used by [[GSP_Shared_Memory|GX command]] 2. 0x1EF00010 is used for the GX command buf0 parameters, while 0x1EF00020 is used for the GX command buf1 parameters.


== 0x1EF00X5C ==
== Screen 0x1EF00400/0x1EF00500 ==
{| class="wikitable" border="1"
{| class="wikitable" border="1"
! Bit
! Offset
! Description
! Length
! Name
! Comments
|-
|-
| 15-0
| 0x5C
| Framebuffer width
| 4
| Framebuffer width & height
| Lower 16 bits: width, upper 16 bits: height
|-
|-
| 31-16
| 0x68
| Framebuffer height
| 4
|}
| Framebuffer A first address
 
| For top screen, this is the left eye 3D framebuffer.
This controls the displayed LCD framebuffer dimensions.
|-
 
| 0x6C
== 0x1EF00X70 ==
| 4
{| class="wikitable" border="1"
| Framebuffer A second address
!  Bit
| For top screen, this is the left eye 3D framebuffer.
!  Description
|-
|-
| 15-0
| 0x70
| 4
| Framebuffer format
| Framebuffer format
| Bit0-15: framebuffer format, bit16-31: unknown
|-
| 0x78
| 4
| Framebuffer select
| Bit0: which framebuffer to display, bit1-7: unknown
|-
|-
| 31-16
| 0x90
| ?
| 4
| Framebuffer size
| Framebuffer width * pixel byte-size.
|-
| 0x94
| 4
| Framebuffer B first address
| For top screen, this is the left eye 3D framebuffer. Unused for bottom screen.
|-
| 0x98
| 4
| Framebuffer B second address
| For top screen, this is the left eye 3D framebuffer. Unused for bottom screen.
|}
|}


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| GL_RGBA4_OES
| GL_RGBA4_OES
|  
|  
|}
== 0x1EF00X78 ==
{| class="wikitable" border="1"
!  Bit
!  Description
|-
| 0
| LCD framebuffer to display (0=first, 1=second)
|-
| 7-1
| ?
|-
| 31-8
| Unused
|}
== 0x1EF00X90 ==
{| class="wikitable" border="1"
!  Bit
!  Description
|-
| 31-0
| Framebuffer width * pixel byte-size.
|}
|}


== Framebuffers ==
== Framebuffers ==
{| class="wikitable" border="1"
!  Process Virtual Address
!  Physical Address
!  Description
|-
| 0x1EF00468
| 0x10400468
| Main LCD, first framebuffer for 3D left
|-
| 0x1EF0046C
| 0x1040046C
| Main LCD, second framebuffer for 3D left
|-
| 0x1EF00494
| 0x10400494
| Main LCD, first framebuffer for 3D right
|-
| 0x1EF00498
| 0x10400498
| Main LCD, second framebuffer for 3D right
|-
| 0x1EF00568
| 0x10400568
| Sub LCD, first framebuffer
|-
| 0x1EF0056C
| 0x1040056C
| Sub LCD, second framebuffer
|-
| 0x1EF00594
| 0x10400594
| Sub LCD, unused first framebuffer
|-
| 0x1EF00598
| 0x10400598
| Sub LCD, unused second framebuffer
|}
The above framebuffer registers contains the physical address for each framebuffer, normally located in FCRAM in the application's GSP heap. When other processes use GSP as well, the framebuffers for the process is stored in VRAM instead.
The above framebuffer registers contains the physical address for each framebuffer, normally located in FCRAM in the application's GSP heap. When other processes use GSP as well, the framebuffers for the process is stored in VRAM instead.


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These 3 registers are used by [[GSP_Shared_Memory|GX command]] 1. This is used for [[GPU_Commands|GPU commands]].
These 3 registers are used by [[GSP_Shared_Memory|GX command]] 1. This is used for [[GPU_Commands|GPU commands]].
==== Init Values from nngxInitialize for Top Screen ====
* 0x1EF00400 = 0x1C2
* 0x1EF00404 = 0xD1
* 0x1EF00408 = 0x1C1
* 0x1EF0040C = 0x1C1
* 0x1EF00410 = 0
* 0x1EF00414 = 0xCF
* 0x1EF00418 = 0xD1
* 0x1EF0041C = 0x1C501C1
* 0x1EF00420 = 0x10000
* 0x1EF00424 = 0x19D
* 0x1EF00428 = 2
* 0x1EF0042C = 0x1C2
* 0x1EF00430 = 0x1C2
* 0x1EF00434 = 0x1C2
* 0x1EF00438 = 1
* 0x1EF0043C = 2
* 0x1EF00440 = 0x1960192
* 0x1EF00444 = 0
* 0x1EF00448 = 0
* 0x1EF0045C = 0x19000F0
* 0x1EF00460 = 0x1c100d1
* 0x1EF00464 = 0x1920002
* 0x1EF00470 = 0x80340
* 0x1EF0049C = 0
==== More Init Values from nngxInitialize for Top Screen ====
* 0x1EF00468 = 0x18300000, later changed by GSP module when updating state, framebuffer
* 0x1EF0046C = 0x18300000, later changed by GSP module when updating state, framebuffer
* 0x1EF00494 = 0x18300000
* 0x1EF00498 = 0x18300000
* 0x1EF00478 = 1, doesn't stay 1, read as 0
* 0x1EF00474 = 0x10501
Retrieved from "https://www.3dbrew.org/wiki/GPU/External_Registers"