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netbsd: Force the use of ev56 instructions for register access on ev56. 

This avoids 32-bit access which might affect other registers.  The linux code
uses gcc flags to get this to happen, but this seems like more of a sure thing.
This commit is contained in:
Manuel Bouyer 2009-02-01 09:14:19 -08:00 committed by Eric Anholt
parent 1375c1b07d
commit 0055fe66d5
1 changed files with 15 additions and 6 deletions
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21
hw/xfree86/os-support/bsd/bsd_ev56.c
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@ -13,6 +13,15 @@
#include "xf86_OSlib.h" #include "xf86_OSlib.h"
#include "xf86OSpriv.h" #include "xf86OSpriv.h"
#include <machine/bwx.h>
/*
* The following functions are used only on EV56 and greater CPUs,
* and the assembler requires going to EV56 mode in order to emit
* these instructions.
*/
__asm(".arch ev56");
int readDense8(pointer Base, register unsigned long Offset); int readDense8(pointer Base, register unsigned long Offset);
int readDense16(pointer Base, register unsigned long Offset); int readDense16(pointer Base, register unsigned long Offset);
int readDense32(pointer Base, register unsigned long Offset); int readDense32(pointer Base, register unsigned long Offset);
@ -33,14 +42,14 @@ int
readDense8(pointer Base, register unsigned long Offset) readDense8(pointer Base, register unsigned long Offset)
{ {
mem_barrier(); mem_barrier();
return *(volatile CARD8*) ((unsigned long)Base+(Offset)); return (alpha_ldbu((pointer)((unsigned long)Base+(Offset))));
} }
int int
readDense16(pointer Base, register unsigned long Offset) readDense16(pointer Base, register unsigned long Offset)
{ {
mem_barrier(); mem_barrier();
return *(volatile CARD16*) ((unsigned long)Base+(Offset)); return (alpha_ldwu((pointer)((unsigned long)Base+(Offset))));
} }
int int
@ -53,13 +62,13 @@ readDense32(pointer Base, register unsigned long Offset)
void void
writeDenseNB8(int Value, pointer Base, register unsigned long Offset) writeDenseNB8(int Value, pointer Base, register unsigned long Offset)
{ {
*(volatile CARD8*)((unsigned long)Base+(Offset)) = Value; alpha_stb((pointer)((unsigned long)Base+(Offset)), Value);
} }
void void
writeDenseNB16(int Value, pointer Base, register unsigned long Offset) writeDenseNB16(int Value, pointer Base, register unsigned long Offset)
{ {
*(volatile CARD16*)((unsigned long)Base + (Offset)) = Value; alpha_stw((pointer)((unsigned long)Base + (Offset)), Value);
} }
void void
@ -72,14 +81,14 @@ void
writeDense8(int Value, pointer Base, register unsigned long Offset) writeDense8(int Value, pointer Base, register unsigned long Offset)
{ {
write_mem_barrier(); write_mem_barrier();
*(volatile CARD8 *)((unsigned long)Base+(Offset)) = Value; alpha_stb((pointer)((unsigned long)Base+(Offset)), Value);
} }
void void
writeDense16(int Value, pointer Base, register unsigned long Offset) writeDense16(int Value, pointer Base, register unsigned long Offset)
{ {
write_mem_barrier(); write_mem_barrier();
*(volatile CARD16 *)((unsigned long)Base+(Offset)) = Value; alpha_stw((pointer)((unsigned long)Base + (Offset)), Value);
} }
void void