diff options
| author | Paul Mackerras <paulus@samba.org> | 2005-10-27 22:44:39 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2005-10-27 22:44:39 +1000 |
| commit | 6316222ea050d469c3155881d9dee2c7671d9fef (patch) | |
| tree | 2a075cbdab11e10efc868a31e378dffae90f06da /include/asm-powerpc/ppc_asm.h | |
| parent | 80579e1f4a6b5f5dec92faa6c3e0645961c99091 (diff) | |
powerpc: Introduce toreal/fromreal assembly macros
On 32-bit platforms, these convert from kernel virtual addresses
to real (physical addresses), like tophys/tovirt but they use
the same register for the source and destination. On 64-bit
platforms, they do nothing because the hardware ignores the top
two bits of the address in real mode.
These new macros are used in fpu.S now.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/asm-powerpc/ppc_asm.h')
| -rw-r--r-- | include/asm-powerpc/ppc_asm.h | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/include/asm-powerpc/ppc_asm.h b/include/asm-powerpc/ppc_asm.h index f8ad5df6ebef..470d7400ac59 100644 --- a/include/asm-powerpc/ppc_asm.h +++ b/include/asm-powerpc/ppc_asm.h @@ -154,7 +154,7 @@ n: * loads the address of 'name' into 'rn' * * LOADBASE( rn, name ) - * loads the address (less the low 16 bits) of 'name' into 'rn' + * loads the address (possibly without the low 16 bits) of 'name' into 'rn' * suitable for base+disp addressing */ #ifdef __powerpc64__ @@ -166,10 +166,7 @@ n: ori rn,rn,name##@l #define LOADBASE(rn,name) \ - .section .toc,"aw"; \ -1: .tc name[TC],name; \ - .previous; \ - ld rn,1b@toc(r2) + ld rn,name@got(r2) #define OFF(name) 0 @@ -278,6 +275,9 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601) #if defined(CONFIG_BOOKE) +#define toreal(rd) +#define fromreal(rd) + #define tophys(rd,rs) \ addis rd,rs,0 @@ -285,23 +285,24 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601) addis rd,rs,0 #elif defined(CONFIG_PPC64) -/* PPPBBB - DRENG If KERNELBASE is always 0xC0..., - * Then we can easily do this with one asm insn. -Peter - */ +#define toreal(rd) /* we can access c000... in real mode */ +#define fromreal(rd) + #define tophys(rd,rs) \ - lis rd,((KERNELBASE>>48)&0xFFFF); \ - rldicr rd,rd,32,31; \ - sub rd,rs,rd + clrldi rd,rs,2 #define tovirt(rd,rs) \ - lis rd,((KERNELBASE>>48)&0xFFFF); \ - rldicr rd,rd,32,31; \ - add rd,rs,rd + rotldi rd,rs,16; \ + ori rd,rd,((KERNELBASE>>48)&0xFFFF);\ + rotldi rd,rd,48 #else /* * On APUS (Amiga PowerPC cpu upgrade board), we don't know the * physical base address of RAM at compile time. */ +#define toreal(rd) tophys(rd,rd) +#define fromreal(rd) tovirt(rd,rd) + #define tophys(rd,rs) \ 0: addis rd,rs,-KERNELBASE@h; \ .section ".vtop_fixup","aw"; \ |