ARC: Boot #2: Verbose Boot reporting / feature verification
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c
index e96030c..9b9ce23 100644
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c
@@ -463,8 +463,46 @@
mmu->num_tlb = mmu->sets * mmu->ways;
}
+char *arc_mmu_mumbojumbo(int cpu_id, char *buf, int len)
+{
+ int n = 0;
+ struct cpuinfo_arc_mmu *p_mmu = &cpuinfo_arc700[smp_processor_id()].mmu;
+
+ n += scnprintf(buf + n, len - n, "ARC700 MMU [v%x]\t: %dk PAGE, ",
+ p_mmu->ver, TO_KB(p_mmu->pg_sz));
+
+ n += scnprintf(buf + n, len - n,
+ "J-TLB %d (%dx%d), uDTLB %d, uITLB %d, %s\n",
+ p_mmu->num_tlb, p_mmu->sets, p_mmu->ways,
+ p_mmu->u_dtlb, p_mmu->u_itlb,
+ __CONFIG_ARC_MMU_SASID_VAL ? "SASID" : "");
+
+ return buf;
+}
+
void __init arc_mmu_init(void)
{
+ char str[256];
+ struct cpuinfo_arc_mmu *mmu = &cpuinfo_arc700[smp_processor_id()].mmu;
+
+ printk(arc_mmu_mumbojumbo(0, str, sizeof(str)));
+
+ /* For efficiency sake, kernel is compile time built for a MMU ver
+ * This must match the hardware it is running on.
+ * Linux built for MMU V2, if run on MMU V1 will break down because V1
+ * hardware doesn't understand cmds such as WriteNI, or IVUTLB
+ * On the other hand, Linux built for V1 if run on MMU V2 will do
+ * un-needed workarounds to prevent memcpy thrashing.
+ * Similarly MMU V3 has new features which won't work on older MMU
+ */
+ if (mmu->ver != CONFIG_ARC_MMU_VER) {
+ panic("MMU ver %d doesn't match kernel built for %d...\n",
+ mmu->ver, CONFIG_ARC_MMU_VER);
+ }
+
+ if (mmu->pg_sz != PAGE_SIZE)
+ panic("MMU pg size != PAGE_SIZE (%luk)\n", TO_KB(PAGE_SIZE));
+
/*
* ASID mgmt data structures are compile time init
* asid_cache = FIRST_ASID and asid_mm_map[] all zeroes