+ asm volatile("" : : : "memory");
+}
+
+/* to activate the MMU we need to set up virtual memory: use 1M areas in bss */
+static inline void mmu_setup(void)
+{
+ static u32 __attribute__((aligned(16384))) page_table[4096];
+ bd_t *bd = gd->bd;
+ int i, j;
+ u32 reg;
+
+ /* Set up an identity-mapping for all 4GB, rw for everyone */
+ for (i = 0; i < 4096; i++)
+ page_table[i] = i << 20 | (3 << 10) | 0x12;
+ /* Then, enable cacheable and bufferable for RAM only */
+ for (j = 0; j < CONFIG_NR_DRAM_BANKS; j++) {
+ for (i = bd->bi_dram[j].start >> 20;
+ i < (bd->bi_dram[j].start + bd->bi_dram[j].size) >> 20;
+ i++) {
+ page_table[i] = i << 20 | (3 << 10) | CACHE_SETUP;
+ }
+ }
+
+ /* Copy the page table address to cp15 */
+ asm volatile("mcr p15, 0, %0, c2, c0, 0"
+ : : "r" (page_table) : "memory");
+ /* Set the access control to all-supervisor */
+ asm volatile("mcr p15, 0, %0, c3, c0, 0"
+ : : "r" (~0));
+ /* and enable the mmu */
+ reg = get_cr(); /* get control reg. */
+ cp_delay();
+ set_cr(reg | CR_M);
+