4.0.0: Difference between revisions

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==Kernel==

* Kernel startup code was updated:

** A new (unused?) function was added, this is roughly the same as the code which originally directly read a MC register (0x70019050) for [[Memory_layout|getting]] the DRAM size, except [[SMC]] ReadWriteRegister is used for the read instead.

** The code which originally read the above register directly was replaced with an inlined version of the above function.

* All RTTI symbols were removed, can no longer know official name of kernel objects. :(

* JIT syscalls were added.

** New MemoryType bit for "JIT allowed".

** New MemoryTypes for JitWritable and JitReadOnly.

* New synchronization syscalls 0x34, 0x35 added.

* New synchronization syscalls 0x34, 0x35 added: These ones allow implementation of synchronization primitives without a mutex+condvar pair. This is more efficient because when a thread wakes up from a condvar, the mutex is held and needs to perform a syscall to unlock it. If you have N threads blocking on a condvar, you need N-1 syscalls to wake all the threads. With the new syscalls, you can wake up all N with a single syscall.

* Added new syscall svcDumpInfoNew, but it's stubbed.

* The linked-list node for KAutoObjects was added to the struct itself instead of being a separate allocation.

* svcGetInfo now exposes the first and last process id for built-in modules.

** This is used by some services to make sure we can't connect to them from outside a privileged module.

* svcReadWriteRegister was updated, now always goes through TZ for both PMC and MC. Whitelist for MC remains the same.

* Support was added for loading non-KIP processes into the Secure pool via a flag in SvcCreateProcess.

** This is used by only for es, to prevent attackers from using GPU DMA to take over the es sysmodule to pirate games.

** Correspondingly, the KHeapArrange calculation of the secure pool size now has an extra 0x13A000 factored in (to ensure there is enough space for es).

===FIRM===

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The package1 entrypoint address specified by BCT was increased by 0x20-bytes, since there's now an additional 0x20-bytes at the start of package1. The additional data is identical to the 0x20-byte block before it.

In SafeMode Firmware the [[Bus_services|Bus]], [[PCV_services|PCV]] and [[PSC_services|psc]] sysmodules are now bundled with the kernel.

Sysmodules:

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** spl:es was added, supporting crypto commands used by the es sysmodule.

** spl:fs was added, supporting crypto commands used by the [[Filesystem services|fs]] FIRM sysmodule.

====Package1====

@@ Line 44: / Line 44: @@
 ==Kernel==
+* Kernel startup code was updated:
+** A new (unused?) function was added, this is roughly the same as the code which originally directly read a MC register (0x70019050) for [[Memory_layout|getting]] the DRAM size, except [[SMC]] ReadWriteRegister is used for the read instead.
+** The code which originally read the above register directly was replaced with an inlined version of the above function.
 * All RTTI symbols were removed, can no longer know official name of kernel objects. :(
 * JIT syscalls were added.
 ** New MemoryType bit for "JIT allowed".
 ** New MemoryTypes for JitWritable and JitReadOnly.
-* New synchronization syscalls 0x34, 0x35 added.
+* New synchronization syscalls 0x34, 0x35 added: These ones allow implementation of synchronization primitives without a mutex+condvar pair. This is more efficient because when a thread wakes up from a condvar, the mutex is held and needs to perform a syscall to unlock it. If you have N threads blocking on a condvar, you need N-1 syscalls to wake all the threads. With the new syscalls, you can wake up all N with a single syscall.
 * Added new syscall svcDumpInfoNew, but it's stubbed.
 * The linked-list node for KAutoObjects was added to the struct itself instead of being a separate allocation.
 * svcGetInfo now exposes the first and last process id for built-in modules.
 ** This is used by some services to make sure we can't connect to them from outside a privileged module.
+* svcReadWriteRegister was updated, now always goes through TZ for both PMC and MC. Whitelist for MC remains the same.
+* Support was added for loading non-KIP processes into the Secure pool via a flag in SvcCreateProcess.
+** This is used by only for es, to prevent attackers from using GPU DMA to take over the es sysmodule to pirate games.
+** Correspondingly, the KHeapArrange calculation of the secure pool size now has an extra 0x13A000 factored in (to ensure there is enough space for es).
 ===FIRM===
@@ Line 58: / Line 67: @@
 The package1 entrypoint address specified by BCT was increased by 0x20-bytes, since there's now an additional 0x20-bytes at the start of package1. The additional data is identical to the 0x20-byte block before it.
+In SafeMode Firmware the [[Bus_services|Bus]], [[PCV_services|PCV]] and [[PSC_services|psc]] sysmodules are now bundled with the kernel.
 Sysmodules:
@@ Line 66: / Line 77: @@
 ** spl:es was added, supporting crypto commands used by the es sysmodule.
 ** spl:fs was added, supporting crypto commands used by the [[Filesystem services|fs]] FIRM sysmodule.
 ====Package1====