1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _ASM_IA64_RSE_H 3 #define _ASM_IA64_RSE_H 4 5 /* 6 * Copyright (C) 1998, 1999 Hewlett-Packard Co 7 * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com> 8 * 9 * Register stack engine related helper functions. This file may be 10 * used in applications, so be careful about the name-space and give 11 * some consideration to non-GNU C compilers (though __inline__ is 12 * fine). 13 */ 14 15 static __inline__ unsigned long ia64_rse_slot_num(unsigned long * addr)16ia64_rse_slot_num (unsigned long *addr) 17 { 18 return (((unsigned long) addr) >> 3) & 0x3f; 19 } 20 21 /* 22 * Return TRUE if ADDR is the address of an RNAT slot. 23 */ 24 static __inline__ unsigned long ia64_rse_is_rnat_slot(unsigned long * addr)25ia64_rse_is_rnat_slot (unsigned long *addr) 26 { 27 return ia64_rse_slot_num(addr) == 0x3f; 28 } 29 30 /* 31 * Returns the address of the RNAT slot that covers the slot at 32 * address SLOT_ADDR. 33 */ 34 static __inline__ unsigned long * ia64_rse_rnat_addr(unsigned long * slot_addr)35ia64_rse_rnat_addr (unsigned long *slot_addr) 36 { 37 return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3)); 38 } 39 40 /* 41 * Calculate the number of registers in the dirty partition starting at BSPSTORE and 42 * ending at BSP. This isn't simply (BSP-BSPSTORE)/8 because every 64th slot stores 43 * ar.rnat. 44 */ 45 static __inline__ unsigned long ia64_rse_num_regs(unsigned long * bspstore,unsigned long * bsp)46ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp) 47 { 48 unsigned long slots = (bsp - bspstore); 49 50 return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40; 51 } 52 53 /* 54 * The inverse of the above: given bspstore and the number of 55 * registers, calculate ar.bsp. 56 */ 57 static __inline__ unsigned long * ia64_rse_skip_regs(unsigned long * addr,long num_regs)58ia64_rse_skip_regs (unsigned long *addr, long num_regs) 59 { 60 long delta = ia64_rse_slot_num(addr) + num_regs; 61 62 if (num_regs < 0) 63 delta -= 0x3e; 64 return addr + num_regs + delta/0x3f; 65 } 66 67 #endif /* _ASM_IA64_RSE_H */ 68