arch/arm64/cache: Implement helpers to obtain CPU cache details
This is required for compliant ACPI/SMBIOS implementations on AArch64,
and can optionally be displayed to the user.
Change-Id: I7022fc3c0035208bc3fdc716fc33f6b78d8e74fc
Signed-off-by: Benjamin Doron <benjamin.doron@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78042
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
diff --git a/src/arch/arm64/armv8/cache.c b/src/arch/arm64/armv8/cache.c
index ae0729e..dbaedec 100644
--- a/src/arch/arm64/armv8/cache.c
+++ b/src/arch/arm64/armv8/cache.c
@@ -11,6 +11,64 @@
#include <arch/lib_helpers.h>
#include <program_loading.h>
+enum cache_type cpu_get_cache_type(enum cache_level level)
+{
+ uint32_t ctype_bitshift = (level - 1) * 3;
+
+ if (level < CACHE_L1 || level > CACHE_L7)
+ return NO_CACHE;
+
+ /* 3-bits per cache-level */
+ return (raw_read_clidr_el1() >> ctype_bitshift) & 0x7;
+}
+
+static uint64_t get_ccsidr_el1_assoc(uint64_t ccsidr_el1)
+{
+ /* [23:20] - CCIDX support enables 64-bit CCSIDR_EL1 */
+ if ((raw_read_id_aa64mmfr2_el1() & 0xF00000) == 0x100000) {
+ /* [23:3] */
+ return (ccsidr_el1 & 0xFFFFF8) >> 3;
+ } else {
+ /* [12:3] */
+ return (ccsidr_el1 & 0x1FF8) >> 3;
+ }
+}
+
+static uint64_t get_ccsidr_el1_numsets(uint64_t ccsidr_el1)
+{
+ /* [23:20] - CCIDX support enables 64-bit CCSIDR_EL1 */
+ if ((raw_read_id_aa64mmfr2_el1() & 0xF00000) == 0x100000) {
+ /* [55:32] */
+ return (ccsidr_el1 & 0xFFFFFF00000000) >> 32;
+ } else {
+ /* [27:13] */
+ return (ccsidr_el1 & 0xFFFE000) >> 13;
+ }
+}
+
+void cpu_get_cache_info(enum cache_level level, enum cache_type type, size_t *cache_size, size_t *assoc)
+{
+ uint64_t ccsidr_el1;
+
+ if (cache_size == NULL || assoc == NULL)
+ return;
+
+ if (level < CACHE_L1 || level > CACHE_L7)
+ return;
+
+ /* [0] - Indicates instruction cache; [3:1] - Indicates cache level */
+ raw_write_csselr_el1(((level - 1) << 1) | (type == CACHE_INSTRUCTION));
+ ccsidr_el1 = raw_read_ccsidr_el1();
+
+ /* [2:0] - Indicates (Log2(Number of bytes in cache line) - 4) */
+ uint8_t line_length = 1 << ((ccsidr_el1 & 0x7) + 4);
+ /* (Number of sets in cache) - 1 */
+ uint64_t num_sets = get_ccsidr_el1_numsets(ccsidr_el1) + 1;
+ /* (Associativity of cache) - 1 */
+ *assoc = get_ccsidr_el1_assoc(ccsidr_el1) + 1;
+ *cache_size = line_length * *assoc * num_sets;
+}
+
unsigned int dcache_line_bytes(void)
{
uint32_t ctr_el0;
diff --git a/src/arch/arm64/include/armv8/arch/cache.h b/src/arch/arm64/include/armv8/arch/cache.h
index bb9d6fe..3a72d40 100644
--- a/src/arch/arm64/include/armv8/arch/cache.h
+++ b/src/arch/arm64/include/armv8/arch/cache.h
@@ -13,6 +13,27 @@
#include <stddef.h>
#include <arch/barrier.h>
+enum cache_level {
+ CACHE_L1 = 1,
+ CACHE_L2 = 2,
+ CACHE_L3 = 3,
+ CACHE_L4 = 4,
+ CACHE_L5 = 5,
+ CACHE_L6 = 6,
+ CACHE_L7 = 7,
+};
+
+enum cache_type {
+ NO_CACHE = 0,
+ CACHE_INSTRUCTION = 1,
+ CACHE_DATA = 2,
+ CACHE_SEPARATE = 3,
+ CACHE_UNIFIED = 4,
+};
+
+enum cache_type cpu_get_cache_type(enum cache_level level);
+void cpu_get_cache_info(enum cache_level level, enum cache_type, size_t *cache_size, size_t *assoc);
+
/* dcache clean by virtual address to PoC */
void dcache_clean_by_mva(void const *addr, size_t len);
diff --git a/src/arch/arm64/include/armv8/arch/lib_helpers.h b/src/arch/arm64/include/armv8/arch/lib_helpers.h
index 4b3730f..ff3459a 100644
--- a/src/arch/arm64/include/armv8/arch/lib_helpers.h
+++ b/src/arch/arm64/include/armv8/arch/lib_helpers.h
@@ -162,6 +162,7 @@
MAKE_REGISTER_ACCESSORS(hcr_el2)
MAKE_REGISTER_ACCESSORS(hpfar_el2)
MAKE_REGISTER_ACCESSORS(hstr_el2)
+MAKE_REGISTER_ACCESSORS(id_aa64mmfr2_el1)
MAKE_REGISTER_ACCESSORS(isr_el1)
MAKE_REGISTER_ACCESSORS_EL123(mair)
MAKE_REGISTER_ACCESSORS_EL123(mdcr)