| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _ASM_IA64_RSE_H |
| 2 | #define _ASM_IA64_RSE_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1998, 1999 Hewlett-Packard Co |
| 6 | * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com> |
| 7 | * |
| 8 | * Register stack engine related helper functions. This file may be |
| 9 | * used in applications, so be careful about the name-space and give |
| 10 | * some consideration to non-GNU C compilers (though __inline__ is |
| 11 | * fine). |
| 12 | */ |
| 13 | |
| 14 | static __inline__ unsigned long |
| 15 | ia64_rse_slot_num (unsigned long *addr) |
| 16 | { |
| 17 | return (((unsigned long) addr) >> 3) & 0x3f; |
| 18 | } |
| 19 | |
| 20 | /* |
| 21 | * Return TRUE if ADDR is the address of an RNAT slot. |
| 22 | */ |
| 23 | static __inline__ unsigned long |
| 24 | ia64_rse_is_rnat_slot (unsigned long *addr) |
| 25 | { |
| 26 | return ia64_rse_slot_num(addr) == 0x3f; |
| 27 | } |
| 28 | |
| 29 | /* |
| 30 | * Returns the address of the RNAT slot that covers the slot at |
| 31 | * address SLOT_ADDR. |
| 32 | */ |
| 33 | static __inline__ unsigned long * |
| 34 | ia64_rse_rnat_addr (unsigned long *slot_addr) |
| 35 | { |
| 36 | return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3)); |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * Calculate the number of registers in the dirty partition starting at BSPSTORE and |
| 41 | * ending at BSP. This isn't simply (BSP-BSPSTORE)/8 because every 64th slot stores |
| 42 | * ar.rnat. |
| 43 | */ |
| 44 | static __inline__ unsigned long |
| 45 | ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp) |
| 46 | { |
| 47 | unsigned long slots = (bsp - bspstore); |
| 48 | |
| 49 | return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40; |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | * The inverse of the above: given bspstore and the number of |
| 54 | * registers, calculate ar.bsp. |
| 55 | */ |
| 56 | static __inline__ unsigned long * |
| 57 | ia64_rse_skip_regs (unsigned long *addr, long num_regs) |
| 58 | { |
| 59 | long delta = ia64_rse_slot_num(addr) + num_regs; |
| 60 | |
| 61 | if (num_regs < 0) |
| 62 | delta -= 0x3e; |
| 63 | return addr + num_regs + delta/0x3f; |
| 64 | } |
| 65 | |
| 66 | #endif /* _ASM_IA64_RSE_H */ |