#include <command.h>
#include <arm920t.h>
+#ifdef CONFIG_USE_IRQ
+DECLARE_GLOBAL_DATA_PTR;
+#endif
+
/* read co-processor 15, register #1 (control register) */
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");
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");
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)
{
* setup up stacks if necessary
*/
#ifdef CONFIG_USE_IRQ
- DECLARE_GLOBAL_DATA_PTR;
-
IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4;
FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
#endif
/* flush I/D-cache */
i = 0;
asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
+
return (0);
}
{
ulong reg;
- reg = read_p15_c1 ();
+ reg = read_p15_c1 (); /* get control reg. */
cp_delay ();
write_p15_c1 (reg | C1_IC);
}