/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #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)); } /* * Calculate the number of registers in the dirty partition starting at BSPSTORE and * ending at BSP. This isn't simply (BSP-BSPSTORE)/8 because every 64th slot stores * 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 */