1 /* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * All advertising materials mentioning features or use of this software 10 * must display the following acknowledgement: 11 * This product includes software developed by the University of 12 * California, Lawrence Berkeley Laboratory. 13 * 14 * %sccs.include.redist.c% 15 * 16 * @(#)asm.h 8.1 (Berkeley) 06/11/93 17 * 18 * from: $Header: asm.h,v 1.5 92/11/26 03:04:42 torek Exp $ 19 */ 20 21 /* 22 * GCC __asm constructs for doing assembly stuff. 23 */ 24 25 /* 26 * ``Routines'' to load and store from/to alternate address space. 27 * The location can be a variable, the asi value (address space indicator) 28 * must be a constant. 29 * 30 * N.B.: You can put as many special functions here as you like, since 31 * they cost no kernel space or time if they are not used. 32 * 33 * These were static inline functions, but gcc screws up the constraints 34 * on the address space identifiers (the "n"umeric value part) because 35 * it inlines too late, so we have to use the funny valued-macro syntax. 36 */ 37 38 /* load byte from alternate address space */ 39 #define lduba(loc, asi) ({ \ 40 register int _lduba_v; \ 41 __asm __volatile("lduba [%1]%2,%0" : "=r" (_lduba_v) : \ 42 "r" ((int)(loc)), "n" (asi)); \ 43 _lduba_v; \ 44 }) 45 46 /* load int from alternate address space */ 47 #define lda(loc, asi) ({ \ 48 register int _lda_v; \ 49 __asm __volatile("lda [%1]%2,%0" : "=r" (_lda_v) : \ 50 "r" ((int)(loc)), "n" (asi)); \ 51 _lda_v; \ 52 }) 53 54 /* store byte to alternate address space */ 55 #define stba(loc, asi, value) ({ \ 56 __asm __volatile("stba %0,[%1]%2" : : \ 57 "r" ((int)(value)), "r" ((int)(loc)), "n" (asi)); \ 58 }) 59 60 /* store int to alternate address space */ 61 #define sta(loc, asi, value) ({ \ 62 __asm __volatile("sta %0,[%1]%2" : : \ 63 "r" ((int)(value)), "r" ((int)(loc)), "n" (asi)); \ 64 }) 65