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69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
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* Copyright (C) 1998, 1999, 2002, 2003, 2005 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* Register stack engine related helper functions. This file may be
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* used in applications, so be careful about the name-space and give
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* some consideration to non-GNU C compilers (though __inline__ is
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* fine).
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*/
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#ifndef RSE_H
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#define RSE_H
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#include "internal.h"
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#include <inttypes.h>
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static inline uint64_t
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rse_slot_num (uint64_t addr)
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{
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return (addr >> 3) & 0x3f;
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}
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/*
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* Return TRUE if ADDR is the address of an RNAT slot.
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*/
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static inline uint64_t
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rse_is_rnat_slot (uint64_t addr)
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{
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return rse_slot_num (addr) == 0x3f;
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}
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/*
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* Returns the address of the RNAT slot that covers the slot at
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* address SLOT_ADDR.
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*/
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static inline uint64_t
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rse_rnat_addr (uint64_t slot_addr)
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{
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return slot_addr | (0x3f << 3);
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}
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/*
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* Calcuate the number of registers in the dirty partition starting at
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* BSPSTORE and ending at BSP. This isn't simply (BSP-BSPSTORE)/8
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* because every 64th slot stores ar.rnat.
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*/
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static inline uint64_t
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rse_num_regs (uint64_t bspstore, uint64_t bsp)
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{
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uint64_t slots = (bsp - bspstore) >> 3;
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return slots - (rse_slot_num(bspstore) + slots)/0x40;
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}
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/*
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* The inverse of the above: given bspstore and the number of
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* registers, calculate ar.bsp.
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*/
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static inline uint64_t
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rse_skip_regs (uint64_t addr, long num_regs)
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{
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long delta = rse_slot_num(addr) + num_regs;
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if (num_regs < 0)
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delta -= 0x3e;
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return addr + ((num_regs + delta/0x3f) << 3);
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}
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#endif /* RSE_H */
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