arm:make no assumptions about TRE and AFE

The bootloader can leave the system control register
in at state that doesn't match our setup. make no assumptions
and configure TRE and AFE.

diff --git a/kernel/arch/earm/pg_utils.c b/kernel/arch/earm/pg_utils.c
index eb2403ab646ade6e5985bbca5c9b3773d34570ad..2895aa314cc3376873cc340afb4423a45648a351 100644 (file)
--- a/kernel/arch/earm/pg_utils.c
+++ b/kernel/arch/earm/pg_utils.c
@@ -159,6 +159,7 @@ void pg_identity(kinfo_t *cbi)
         for(i = 0; i < ARM_VM_DIR_ENTRIES; i++) {
                u32_t flags = ARM_VM_SECTION
                        | ARM_VM_SECTION_USER
+                       | ARM_VM_SECTION_DEVICE
                        | ARM_VM_SECTION_DOMAIN;
                phys = i * ARM_SECTION_SIZE;
                pagedir[i] =  phys | flags;
@@ -201,6 +202,10 @@ void vm_enable_paging(void)
 
        /* AFE set to zero (default reset value): not using simplified model. */
        /* TRE set to zero (default reset value): TEX[2:0] are used, plus C and B bits.*/
+       sctlr &= ~SCTLR_TRE;
+
+       /* AFE set to zero (default reset value): not using simplified model. */
+       sctlr &= ~SCTLR_AFE;
 
        /* Enable instruction and data cache */
        sctlr |= SCTLR_C;