rse.h
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上传日期:2013-04-10
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- #ifndef _ASM_IA64_RSE_H
- #define _ASM_IA64_RSE_H
- /*
- * Copyright (C) 1998, 1999 Hewlett-Packard Co
- * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
- *
- * Register stack engine related helper functions. This file may be
- * used in applications, so be careful about the name-space and give
- * some consideration to non-GNU C compilers (though __inline__ is
- * fine).
- */
- static __inline__ unsigned long
- ia64_rse_slot_num (unsigned long *addr)
- {
- return (((unsigned long) addr) >> 3) & 0x3f;
- }
- /*
- * Return TRUE if ADDR is the address of an RNAT slot.
- */
- static __inline__ unsigned long
- ia64_rse_is_rnat_slot (unsigned long *addr)
- {
- return ia64_rse_slot_num(addr) == 0x3f;
- }
- /*
- * Returns the address of the RNAT slot that covers the slot at
- * address SLOT_ADDR.
- */
- static __inline__ unsigned long *
- ia64_rse_rnat_addr (unsigned long *slot_addr)
- {
- return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
- }
- /*
- * Calcuate the number of registers in the dirty partition starting at
- * BSPSTORE with a size of DIRTY bytes. This isn't simply DIRTY
- * divided by eight because the 64th slot is used to store ar.rnat.
- */
- static __inline__ unsigned long
- ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
- {
- unsigned long slots = (bsp - bspstore);
- return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
- }
- /*
- * The inverse of the above: given bspstore and the number of
- * registers, calculate ar.bsp.
- */
- static __inline__ unsigned long *
- ia64_rse_skip_regs (unsigned long *addr, long num_regs)
- {
- long delta = ia64_rse_slot_num(addr) + num_regs;
- if (num_regs < 0)
- delta -= 0x3e;
- return addr + num_regs + delta/0x3f;
- }
- #endif /* _ASM_IA64_RSE_H */