/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _ASM_IA64_RSE_H
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#define _ASM_IA64_RSE_H
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/*
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* Copyright (C) 1998, 1999 Hewlett-Packard Co
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* Copyright (C) 1998, 1999 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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static __inline__ unsigned long
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ia64_rse_slot_num (unsigned long *addr)
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{
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return (((unsigned long) 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__ unsigned long
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ia64_rse_is_rnat_slot (unsigned long *addr)
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{
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return ia64_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__ unsigned long *
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ia64_rse_rnat_addr (unsigned long *slot_addr)
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{
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return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
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}
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/*
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* Calculate the number of registers in the dirty partition starting at BSPSTORE and
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* ending at BSP. This isn't simply (BSP-BSPSTORE)/8 because every 64th slot stores
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* ar.rnat.
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*/
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static __inline__ unsigned long
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ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
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{
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unsigned long slots = (bsp - bspstore);
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return slots - (ia64_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__ unsigned long *
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ia64_rse_skip_regs (unsigned long *addr, long num_regs)
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{
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long delta = ia64_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;
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}
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#endif /* _ASM_IA64_RSE_H */
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