Difference between revisions of "RO services"

From Nintendo Switch Brew
Jump to navigation Jump to search
(Fixed capitalisation)
(No difference)

Revision as of 09:17, 22 April 2019

Prior to 3.0.0, ro was included as part of Loader services. Despite the separation, the service name ldr:ro is retained to maintain compatibility with old games.

ldr:ro, ro:1

[1.0.0-2.3.0] This is "nn::ldr::detail::IRoInterface"

[3.0.0+] This is "nn::ro::detail::IRoInterface".

[7.0.0+] ro:1 was added, and also creates nn::ro::detail::IRoInterface objects.

Cmd Name
0 #LoadNro
1 UnloadNro
2 #LoadNrr
3 UnloadNrr
4 #Initialize
10 [7.0.0+] #LoadNrrEx


Word Value
0 0x00000004
1 0x80000012
2 0x00000001
0-1 Pid
0 "SCFI"
1 0x00000000
2 Always 0.
3 Nro heap address
4 Nro size
5 Bss backing heap address
6 Bss size


[7.0.0+] A new 8-bit field at NRR + 0x33C (previously padding) must be 0 for this function to succeed.

Word Value
0 0x00000004
1 0x8000000E
2 0x00000001
0-1 Pid
0 "SFCI"
1 0x00000002
2 Always 0.
3 Nrr address
4 Nrr size


Word Value
0 0x00000004
1 0x8000000A
2 0x00000003
0-1 Pid
2 Process handle (0xFFFF8001)
0 "SFCI"
1 0x00000004
2 Always 0.


Takes in a u64 nrr_address, a u64 nrr_size, a pid descriptor, and a process handle.

First, this validates that the pid descriptor matches the pid for the process handle sent to this->Initialize() earlier.

Then, this calls the same function as LoadNrr, except using the passed process handle instead of the one sent to Initialize.

When called from an ro:1 session, the field at NRR header + 0x33C must be 0x1. When called from ldr:ro session, the field at NRR header + 0x33C must be 0x0.