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Diffstat (limited to 'share/man/man9/arch.9')
| -rw-r--r-- | share/man/man9/arch.9 | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/share/man/man9/arch.9 b/share/man/man9/arch.9 index 6948e81..94ccd6a 100644 --- a/share/man/man9/arch.9 +++ b/share/man/man9/arch.9 @@ -48,16 +48,43 @@ struct which contains CPU specific fields. Example .Ft cpu_info -structure for x86_64 is shown below: +structure shown below: .Bd -literal struct cpu_info { + /* Per-arch fields */ void *pmap; /* Current pmap */ - volatile uint32_t lapic_freq; + uint32_t id; + struct spinlock lock; + /* AMD64 */ ... }; .Ed +There will be some per-architecture fields that, for the sake +of keeping things tidy, should remain at the top of the struct. +These fields will be described below. + +The +.Ft pmap +field points to the current virtual memory context +which shall be NULL if not used. + +The +.Ft id +field simply identifies the CPU with a specific "ID". + +The +.Ft lock +field is a spinlock to prevent race conditions +while accessing this structure. This must be acquired +when accessing a +.Ft cpu_info +instance. + +There are also some common helper macros that shall +be implemented, these are described below. + The macro .Ft this_cpu() calls an internal function that fetches the |