Changeset bad1f53 in mainline for kernel/arch/arm32/src/cpu/cpu.c

Timestamp:

2013-01-19T16:35:17Z (13 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

827aae5

Parents:

5fcd537

Message:

arm32: Detect caches on armv7

File:

• kernel/arch/arm32/src/cpu/cpu.c (modified) (3 diffs)

kernel/arch/arm32/src/cpu/cpu.c

@@ -34 +34 @@
  */
 
+#include <arch/cache.h>
 #include <arch/cpu.h>
+#include <arch/cp15.h>
 #include <cpu.h>
 #include <arch.h>
 #include <print.h>
+
+static inline unsigned log2(unsigned val)
+{
+        unsigned log = 0;
+        --val;
+        while (val) {
+                ++log;
+                val >>= 1;
+        }
+        return log;
+}
+
+static unsigned dcache_ways(unsigned level);
+static unsigned dcache_sets(unsigned level);
+static unsigned dcache_linesize_log(unsigned level);
+
 
 /** Implementers (vendor) names */
@@ -93 +111 @@
         cpu->rev_num = (ident << 28) >> 28;
         // TODO CPUs with arch_num == 0xf use CPUID scheme for identification
+        cpu->dcache_levels = dcache_levels();
+
+        for (unsigned i = 0; i < cpu->dcache_levels; ++i) {
+                cpu->dcache[i].ways = dcache_ways(i);
+                cpu->dcache[i].sets = dcache_sets(i);
+                cpu->dcache[i].way_shift = 31 - log2(cpu->dcache[i].ways);
+                cpu->dcache[i].set_shift = dcache_linesize_log(i);
+                cpu->dcache[i].line_size = 1 << dcache_linesize_log(i);
+                printf("Found DCache L%u: %u-way, %u sets, %u byte lines "
+                    "(shifts: w%u, s%u)\n", i + 1, cpu->dcache[i].ways,
+                    cpu->dcache[i].sets, cpu->dcache[i].line_size,
+                    cpu->dcache[i].way_shift, cpu->dcache[i].set_shift);
+        }
 }
 
@@ -170 +201 @@
 }
 
+/** See chapter B4.1.19 of ARM Architecture Reference Manual */
+static unsigned dcache_linesize_log(unsigned level)
+{
+#ifdef PROCESSOR_ARCH_armv7_a
+        CSSELR_write((level & CCSELR_LEVEL_MASK) << CCSELR_LEVEL_SHIFT);
+        const unsigned ls_log = 2 +
+            ((CCSIDR_read() >> CCSIDR_LINESIZE_SHIFT) & CCSIDR_LINESIZE_MASK);
+        return ls_log + 2; //return log2(bytes)
+#endif
+        return 0;
+
+}
+
+/** See chapter B4.1.19 of ARM Architecture Reference Manual */
+static unsigned dcache_ways(unsigned level)
+{
+#ifdef PROCESSOR_ARCH_armv7_a
+        CSSELR_write((level & CCSELR_LEVEL_MASK) << CCSELR_LEVEL_SHIFT);
+        const unsigned ways = 1 +
+            ((CCSIDR_read() >> CCSIDR_ASSOC_SHIFT) & CCSIDR_ASSOC_MASK);
+        return ways;
+#endif
+        return 0;
+}
+
+/** See chapter B4.1.19 of ARM Architecture Reference Manual */
+static unsigned dcache_sets(unsigned level)
+{
+#ifdef PROCESSOR_ARCH_armv7_a
+        CSSELR_write((level & CCSELR_LEVEL_MASK) << CCSELR_LEVEL_SHIFT);
+        const unsigned sets = 1 +
+            ((CCSIDR_read() >> CCSIDR_NUMSETS_SHIFT) & CCSIDR_NUMSETS_MASK);
+        return sets;
+#endif
+        return 0;
+}
+
+unsigned dcache_levels(void)
+{
+        const uint32_t val = CLIDR_read();
+        unsigned levels = 0;
+        for (unsigned i = 1; i <= 7; ++i) {
+                const unsigned ctype = CLIDR_CACHE(i, val);
+                switch (ctype) {
+                case CLIDR_DCACHE_ONLY:
+                case CLIDR_SEP_CACHE:
+                case CLIDR_UNI_CACHE:
+                        ++levels;
+                default:
+                        (void)0;
+                }
+        }
+        return levels;
+}
+
+static void dcache_clean_manual(unsigned level, bool invalidate,
+    unsigned ways, unsigned sets, unsigned way_shift, unsigned set_shift)
+{
+
+        for (unsigned i = 0; i < ways; ++i) {
+                for (unsigned j = 0; j < sets; ++j) {
+                        const uint32_t val =
+                            ((level & 0x7) << 1) |
+                            (j << set_shift) | (i << way_shift);
+                        if (invalidate)
+                                DCCISW_write(val);
+                        else
+                                DCCSW_write(val);
+                }
+        }
+}
+
+void dcache_flush(void)
+{
+        /* See ARM Architecture Reference Manual ch. B4.2.1 p. B4-1724 */
+        const unsigned levels = dcache_levels();
+        for (unsigned i = 0; i < levels; ++i) {
+                const unsigned ways = dcache_ways(i);
+                const unsigned sets = dcache_sets(i);
+                const unsigned way_shift =  31 - log2(ways);
+                const unsigned set_shift = dcache_linesize_log(i);
+                dcache_clean_manual(i, false, ways, sets, way_shift, set_shift);
+        }
+}
+
+void dcache_flush_invalidate(void)
+{
+        /* See ARM Architecture Reference Manual ch. B4.2.1 p. B4-1724 */
+        const unsigned levels = dcache_levels();
+        for (unsigned i = 0; i < levels; ++i) {
+                const unsigned ways = dcache_ways(i);
+                const unsigned sets = dcache_sets(i);
+                const unsigned way_shift =  31 - log2(ways);
+                const unsigned set_shift = dcache_linesize_log(i);
+                dcache_clean_manual(i, true, ways, sets, way_shift, set_shift);
+        }
+}
+
+
+void cpu_dcache_flush(void)
+{
+        for (unsigned i = 0; i < CPU->arch.dcache_levels; ++i)
+                dcache_clean_manual(i, false,
+                    CPU->arch.dcache[i].ways, CPU->arch.dcache[i].sets,
+                    CPU->arch.dcache[i].way_shift, CPU->arch.dcache[i].set_shift);
+}
+
+void cpu_dcache_flush_invalidate(void)
+{
+        const unsigned levels =  dcache_levels();
+        for (unsigned i = 0; i < levels; ++i)
+                dcache_clean_manual(i, true,
+                    CPU->arch.dcache[i].ways, CPU->arch.dcache[i].sets,
+                    CPU->arch.dcache[i].way_shift, CPU->arch.dcache[i].set_shift);
+}
+
+void icache_invalidate(void)
+{
+        ICIALLU_write(0);
+}
+
 /** @}
  */