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Added comment about the use of some special purpose registers.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15880 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2006-01-09 03:11:31 +00:00
parent e525ca0a4d
commit c9eb843c35
1 changed files with 11 additions and 0 deletions
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11
headers/private/kernel/arch/ppc/arch_cpu.h
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@ -159,4 +159,15 @@ enum ppc_processor_version {
MPC8245 = 0x8081,
};
/*
Use of (some) special purpose registers.
SPRG0: per CPU physical address pointer to an ppc_cpu_exception_context
structure
SPRG1: scratch
SPRG2: current struct thread*
SPRG3: TLS base pointer (only for userland threads)
*/
#endif /* _KERNEL_ARCH_PPC_CPU_H */