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67 lines
1.7 KiB
67 lines
1.7 KiB
/* 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 <[email protected]> |
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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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