diff options
Diffstat (limited to 'cpu/arm920t/cpu.c')
| -rw-r--r-- | cpu/arm920t/cpu.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/cpu/arm920t/cpu.c b/cpu/arm920t/cpu.c index 718f253..2f7963d 100644 --- a/cpu/arm920t/cpu.c +++ b/cpu/arm920t/cpu.c @@ -39,7 +39,7 @@ static unsigned long read_p15_c1 (void) unsigned long value; __asm__ __volatile__( - "mrc p15, 0, %0, c1, c0, 0 @ read control reg\n" + "mrc p15, 0, %0, c1, c0, 0 @ read control reg\n" : "=r" (value) : : "memory"); @@ -57,7 +57,7 @@ static void write_p15_c1 (unsigned long value) printf ("write %08lx to p15/c1\n", value); #endif __asm__ __volatile__( - "mcr p15, 0, %0, c1, c0, 0 @ write it back\n" + "mcr p15, 0, %0, c1, c0, 0 @ write it back\n" : : "r" (value) : "memory"); @@ -73,16 +73,17 @@ static void cp_delay (void) for (i = 0; i < 100; i++); } -/* See also ARM Ref. Man. */ +/* See also ARM920T Technical reference Manual */ #define C1_MMU (1<<0) /* mmu off/on */ #define C1_ALIGN (1<<1) /* alignment faults off/on */ #define C1_DC (1<<2) /* dcache off/on */ -#define C1_BIG_ENDIAN (1<<7) /* big endian off/on */ + +#define C1_BIG_ENDIAN (1<<7) /* big endian off/on */ #define C1_SYS_PROT (1<<8) /* system protection */ #define C1_ROM_PROT (1<<9) /* ROM protection */ #define C1_IC (1<<12) /* icache off/on */ -#define C1_HIGH_VECTORS (1<<13) /* location of vectors: low/high addresses */ -#define RESERVED_1 (0xf << 3) /* must be 111b for R/W */ +#define C1_HIGH_VECTORS (1<<13) /* location of vectors: low/high addresses */ + int cpu_init (void) { @@ -119,6 +120,7 @@ int cleanup_before_linux (void) /* flush I/D-cache */ i = 0; asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i)); + return (0); } @@ -134,7 +136,7 @@ void icache_enable (void) { ulong reg; - reg = read_p15_c1 (); + reg = read_p15_c1 (); /* get control reg. */ cp_delay (); write_p15_c1 (reg | C1_IC); } |