On 13 Aug 2008, at 11:59, Vinzent Höfler wrote:
leledumbo wrote:Since no one answers on message board, I'll post it here. C struct: typedef unsigned int u32int; typedef struct page { u32int present : 1; // Page present in memory u32int rw : 1; // Read-only if clear, readwrite if set u32int user : 1; // Supervisor level only if clear u32int accessed : 1; // Has the page been accessed since last refresh? u32int dirty : 1; // Has the page been written to since last refresh? u32int unused : 7; // Amalgamation of unused and reserved bits u32int frame : 20; // Frame address (shifted right 12 bits) } page_t;Hmm. That's nasty. ;)w > Pascal record please... Should be something like that: type Unsigned_7 = 0 .. (1 shl 7) - 1; Unsigned_20 = 0 .. (1 shl 20) - 1; type page_t = bitpacked record
Yes and no: the layout of bitpacked records is by no means guaranteed to be the same as that of a C record, regardless of the definition of the C record. The internal format of bitpacked records is opaque and must not be used in any case where data has to be interchanged or where a particular layout is desired.
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