Configuration Memory

2020-06-23T21:19:59Z

PSI: Add information on where the MAC address comes from.

= ARM11 Kernel Configuration Memory =
{| class="wikitable" border="1"
! NAME
! PROCESS VIRTUAL ADDRESS
! WIDTH
|-
| KERNEL_?
| 0x1FF80000
| 1
|-
| KERNEL_VERSIONREVISION
| 0x1FF80001
| 1
|-
| KERNEL_VERSIONMINOR
| 0x1FF80002
| 1
|-
| KERNEL_VERSIONMAJOR
| 0x1FF80003
| 1
|-
| UPDATEFLAG
| 0x1FF80004
| 4
|-
| NSTID
| 0x1FF80008
| 8
|-
| SYSCOREVER
| 0x1FF80010
| 4
|-
| ENVINFO
| 0x1FF80014
| 1
|-
| UNITINFO
| 0x1FF80015
| 1
|-
| PREV_FIRM
| 0x1FF80016
| 1
|-
| KERNEL_CTRSDKVERSION
| 0x1FF80018
| 4
|-
| FIRMLAUNCHFLAGS
| 0x1FF8001C
| 4
|-
| APPMEMTYPE
| 0x1FF80030
| 4
|-
| APPMEMALLOC
| 0x1FF80040
| 4
|-
| SYSMEMALLOC
| 0x1FF80044
| 4
|-
| BASEMEMALLOC
| 0x1FF80048
| 4
|-
| FIRM_?
| 0x1FF80060
| 1
|-
| FIRM_VERSIONREVISION
| 0x1FF80061
| 1
|-
| FIRM_VERSIONMINOR
| 0x1FF80062
| 1
|-
| FIRM_VERSIONMAJOR
| 0x1FF80063
| 1
|-
| FIRM_SYSCOREVER
| 0x1FF80064
| 4
|-
| FIRM_CTRSDKVERSION
| 0x1FF80068
| 4
|}

This memory page is mapped as "shared device" (it is thus uncached) and [[Memory_layout|read-only]] for ARM11 processes. This memory and the kernel code for it only exists under NATIVE_FIRM/SAFE_MODE_FIRM.

The FIRM_* fields are by default identical to the KERNEL_* fields. However, the FIRM_* fields can be overridden via FIRM-launch parameters, see [[FIRM|here]].

Besides mem-region related fields, the data written here by the old 3DS/new 3DS kernels is identical.

= Shared Memory Page For ARM11 Processes =
{| class="wikitable" border="1"
! NAME
! PROCESS VIRTUAL ADDRESS
! WIDTH
|-
| bit0 selects DATETIME_0 or DATETIME_1.
| 0x1FF81000
| 4
|-
| RUNNING_HW (1=product, 2=devboard, 3=debugger, 4=capture, 5=?)
| 0x1FF81004
| 1
|-
| MCU_HW_INFO
| 0x1FF81005
| 1
|-
| ? (Set by PTM) Possibe values are 2, 4, 6, 7, 8 and 9
| 0x1FF81006
| 1
|-
| DATETIME_0 {(u64)MillisecondsSinceFirstJan1900,(u64)SystemTickLastTimeThisWasUpdated,(u32)unk(set to 0xFFB0FF0 by PTM),(u32)Set to 0 by PTM,(u32)Set to 0 by PTM,(u32)set to 0 by PTM}
| 0x1FF81020
| 32
|-
| DATETIME_1
| 0x1FF81040
| 32
|-
| WIFI_MACADDR
| 0x1FF81060
| 6
|-
| WIFI_LINKLEVEL Ranges from 0-3; 0 stands for no or a poor network connection; 3 stands for a good connection. This corresponds with the number of wifi bars displayed by [[Home Menu]].
| 0x1FF81066
| 1
|-
| NETWORK_STATE The network state displayed by [[Home Menu]]. 2: Internet, 3/4/6: Local, 7: Disabled, Everything else: Enabled
| 0x1FF81067
| 1
|-
| 3D_SLIDERSTATE
| 0x1FF81080
| 4
|-
| 3D_LEDSTATE
| 0x1FF81084
| 1
|-
| BATTERY_LEDSTATE
| 0x1FF81085
| 1
|-
| On startup, and under certain conditions, NS will continuously call svcSleepThread(1000*1000) as long as bit0 of this field is clear. ptmInitialize() sets this after writing MCU unit info to sharedmem.
| 0x1FF81086
| 1
|-
| MENUTID
| 0x1FF810A0
| 8
|-
| ACTIVEMENUTID
| 0x1FF810A8
| 8
|-
| Signed? Headsets connected?
| 0x1FF810C0
| 1
|}

This memory page is normally read-only for ARM11 processes, write-access is [[Memory_layout|determined]] by the process exheader kernel "shared page writing" flag. It is mapped as "shared device" (it is thus uncached) in both cases.

This memory only exists under NATIVE_FIRM/SAFE_MODE_FIRM.

= ARM11 Kernel Config Fields =

== 0x1FF80000 / 0x1FF80060 ==
Unknown, this is normally value 0.

== KERNEL_VERSIONREVISION / FIRM_VERSIONREVISION ==
This is the version-revision for the currently running [[FIRM]].

== KERNEL_VERSIONMINOR ==
This is the version-minor from ((title-version & 0x3FF) >> 4), for the currently running [[FIRM]]. The values from KERNEL_VERSIONMINOR and KERNEL_VERSIONMAJOR can be stored in applications' [[NCCH#CXI|CXI]] exheader.

== FIRM_VERSIONMINOR ==
This is the same as KERNEL_VERSIONMINOR. After [[AM:InstallNATIVEFIRM]] checks FIRM_SYSCOREVER, [[AM:InstallNATIVEFIRM]] then compares FIRM_VERSIONMINOR with the NATIVE_FIRM ((title-version & 0x3FF) >> 4), when the latter is larger than FIRM_VERSIONMINOR [[AM:InstallNATIVEFIRM]] will trigger a [[FIRM]] install.

== KERNEL_VERSIONMAJOR / FIRM_VERSIONMAJOR ==
This is the version-major for the currently running [[FIRM]].

The kernel initializes KERNEL_VERSIONMAJOR and SYSCOREVER with the same constant value.

== UPDATEFLAG ==
Normally this flag is zero. When the ARM11 kernel is booting on non-factory FIRM it will set this flag to 1, when bit0 from the data which field 0x1FF80016 is loaded from is clear, if the following [[PAD]] buttons are pressed: L, R, A, Up. When this flag is set, [[NS]] will launch the [[System_Settings#System_Updater|System Updater]] title instead of [[Home Menu]].

== NSTID ==
This field contains the titleID of the first title to launch from CTR-NAND after the [[FIRM]] system processes are loaded. The [[Process_Manager_Services|PM]] module launches this title. If this field titleID is all-zero, the system will not attempt to launch the title. The regular ARM11 kernel sets this to the regular [[NS]] titleID, while the SAFE_MODE ARM11 kernel sets this to the SAFE_MODE NS titleID. The factory FIRM ARM11-kernel sets this to the NS TID from [[Factory_Setup|here]].

== SYSCOREVER ==
This field is initialized by the ARM11 kernel, this is the programID-low of the running FIRM. When launching [[NCCH#CXI|CXIs]], the value stored here must match the core version field stored in the CXI exheader. If they do not match, the [[Process_Manager_Services|PM]] module will refuse to launch the ARM11 process.

With [[Factory_Setup|factory]] NATIVE_FIRM, this is set to 0x0, even though the FIRM programID-low is 0x2. However, the factory system-titles have core-version set to 0x2. Hence, this config-mem SYSCOREVER field might not be used by factory system processes?

== FIRM_SYSCOREVER ==
Normally this is the same as SYSCOREVER. This used by [[AM:InstallNATIVEFIRM]] for comparing with the NATIVE_FIRM titleID-low. When the low u8 from the NATIVE_FIRM titleID-low is larger than FIRMSYSCOREVER, [[AM:InstallNATIVEFIRM]] will trigger FIRM installing. When that u8 is not larger than FIRM_SYSCOREVER, and these two values don't match, [[AM:InstallNATIVEFIRM]] will return an error.

== ENVINFO ==
{| class="wikitable" border="1"
! Bit
! Description
|-
| 0
| Clear for developer unit, set for retail.(See 0x1FF80015)
|-
| 1
| IsJtagConnected
|-
| 2-7
|?
|}

Bit1 in this field is set by the ARM11 kernel when ARM debug CP14 DSCR bit14 is set (halting debug-mode enabled). [[NS]] loads the menu TID from MENUTID when bits 1-7 of this field are clear. [[ErrDisp]] will display development error info when bit0 is clear.

== UNITINFO ==
{| class="wikitable" border="1"
! Value
! Boot Env
|-
| 0
| Prod
|-
| 1
| Dev
|-
| 2
| Debugger
|-
| 3
| Firm
|}

The ARM11 loads the value of [[CONFIG_Registers#CFG_UNITINFO|CFG_UNITINFO]] from 0x1FFFFFF0+1 during startup, which is written by the ARM9 during ARM9<>ARM11 kernel sync.

When this field is zero, bit0 for ENVINFO is set for retail. When this field is non-zero, bit0 for ENVINFO is clear for dev/debug units, and an ARM11 kernel state flag which enables debugging is set. JTAG is only enabled for debugger and "firm" modes (bit1).

== PREV_FIRM ==
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| Cold Boot
|-
| 1
| Reset from CTR mode
|-
| 3
| Reset from TWL mode
|-
| 5
| Reset from NTR mode
|-
| 7
| Reset from AGB mode
|}

The ARM11 loads this value from 0x1FFFFFF0+2 during startup, which is written by the ARM9 during ARM9<>ARM11 kernel sync.

This originates from the low 8-bits of register [[CONFIG|0x10010000]]. When bit0 is set, the ARM11 kernel will not set the UPDATEFLAG to value 1.

== KERNEL_CTRSDKVERSION / FIRM_CTRSDKVERSION ==
This is the CTR-SDK version which was used to build the currently running [[FIRM]].

== APPMEMTYPE ==
The value of this field determines the size for APPMEMALLOC. The retail type(value0) is used when the type is not values 2-5. See [[Memory_layout]] for the table of values for this and the mem-region sizes.

== APPMEMALLOC ==
This contains the total size of the memory that can be allocated with the APPLICATION [[SVC|memory-region]], see [[Memory_layout|here]].

== SYSMEMALLOC ==
Same as APPMEMALLOC except for the SYSTEM mem-region, see [[Memory_layout|here]].

== BASEMEMALLOC ==
Same as APPMEMALLOC except for the BASE mem-region, see [[Memory_layout|here]].

= Shared Memory Page Fields =

== WIFI_MACADDR ==
This is the WiFi MAC address for the 3DS. This is initialized by the [[NWM_Services|NWM]] module and is loaded from the WiFi card's EEPROM.

== 3D_SLIDERSTATE ==
This float contains the state of the 3D slider. The range of this float is value 0.0f for "off", and 1.0f for max.

This is written/updated by [[HID_Services|HID]] module.

== 3D_LEDSTATE ==
When non-zero, the 3D LED is disabled. See [[GSPGPU:SetLedForceOff]].

== BATTERY_LEDSTATE ==
Bit[0] is set when the adapter is connected. Bit[1] is set when the battery is charging. Bit[2:4] is the value of [[PTM:GetBatteryLevel|battery level]]. If the connection bit is set but the charging bit is clear, it means the battery is already fully charged but still with adapter connected.

== MENUTID ==
Unknown, contains the menu TID (used by [[NS]])

== ACTIVEMENUTID ==
This contains the titleID of the currently running menu launched by [[NS]].

= NATIVE_FIRM Versions =

See [[FIRM#NATIVE_FIRM|FIRM]].

3dbrew - User contributions [en]

Configuration Memory