Secure Monitor

Secure Monitor Calls

The secure monitor provides two top level handlers of which each provides a range of sub handlers.

Secure Monitor Calls follow the ARM SMC calling convention up to a small change:

Bit number	Bit mask	Description
31	0x80000000	Set to 0 means Yielding Call; Set to 1 means Fast Call.
30	0x40000000	Set to 0 means SMC32 convention; Set to 1 means SMC64.
29-24	0x3F000000	Service Call ranges.
23-16	0x00FF0000	Must be zero.
15-8	0x0000FF00	Argument type. This is different from the ARM SMC calling convention.
7-0	0x000000FF	Function number within the range call type.

If bit n is set in the argument type then parameter Xn is treated as a pointer and the kernel will setup address translation for it in svcCallSecureMonitor.

Id 0

Functions exposed to user-mode processes using svcCallSecureMonitor.

Sub-Id	Name	In	Out
0xC3000401	SetConfig
0xC3000002	GetConfig (Same as Id 1 Sub-Id 4.)
0xC3000003	CheckStatus_5_9_F_10
0xC3000404	GetResult_5_9_F_10
0xC3000E05	ExpMod
0xC3000006	PrngX931 (Same as Id 1 Sub-Id 5.)
0xC3000007	KeygenAndSealX
0xC3000008	SetKeyslotFromXY
0xC3000009	SymmetricCrypto
0xC300000A	KeygenA
0xC300040B	CMAC
0xC300100C	ImportParamsFor10WithXY
0xC300100D	DecryptExpModParamsWithXY
0xC300100E	ImportParamsForFWithXY
0xC300060F	ExpMod
0xC3000610	ExpModAndKeygenAndSealZ
0xC3000011	SetKeyslotFromZ
0xC3000012	[2.0.0+] KeygenAndSealZ

Id 1

Functions exposed to the kernel internally.

Sub-Id	Name	In	Out
0xC4000001	CpuSuspend (oyasumi)
0x84000002	CpuOff
0xC4000003	CpuOn
0xC3000004	GetConfig (Same as Id 0 Sub-Id 2.)
0xC3000005	PrngX931 (Same as Id 0 Sub-Id 6.)
0xC3000006	Panic
0xC3000007	[2.0.0+] ProtectKernelRegion
0xC3000008	[2.0.0+] ReadWriteRegister