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-rw-r--r--cmd/x86/mtrr.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/cmd/x86/mtrr.c b/cmd/x86/mtrr.c
new file mode 100644
index 00000000000..f632f495ede
--- /dev/null
+++ b/cmd/x86/mtrr.c
@@ -0,0 +1,139 @@
+/*
+ * (C) Copyright 2014 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/msr.h>
+#include <asm/mtrr.h>
+
+static const char *const mtrr_type_name[MTRR_TYPE_COUNT] = {
+ "Uncacheable",
+ "Combine",
+ "2",
+ "3",
+ "Through",
+ "Protect",
+ "Back",
+};
+
+static int do_mtrr_list(void)
+{
+ int i;
+
+ printf("Reg Valid Write-type %-16s %-16s %-16s\n", "Base ||",
+ "Mask ||", "Size ||");
+ for (i = 0; i < MTRR_COUNT; i++) {
+ const char *type = "Invalid";
+ uint64_t base, mask, size;
+ bool valid;
+
+ base = native_read_msr(MTRR_PHYS_BASE_MSR(i));
+ mask = native_read_msr(MTRR_PHYS_MASK_MSR(i));
+ size = ~mask & ((1ULL << CONFIG_CPU_ADDR_BITS) - 1);
+ size |= (1 << 12) - 1;
+ size += 1;
+ valid = mask & MTRR_PHYS_MASK_VALID;
+ type = mtrr_type_name[base & MTRR_BASE_TYPE_MASK];
+ printf("%d %-5s %-12s %016llx %016llx %016llx\n", i,
+ valid ? "Y" : "N", type, base & ~MTRR_BASE_TYPE_MASK,
+ mask & ~MTRR_PHYS_MASK_VALID, size);
+ }
+
+ return 0;
+}
+
+static int do_mtrr_set(uint reg, int argc, char * const argv[])
+{
+ const char *typename = argv[0];
+ struct mtrr_state state;
+ uint32_t start, size;
+ uint64_t base, mask;
+ int i, type = -1;
+ bool valid;
+
+ if (argc < 3)
+ return CMD_RET_USAGE;
+ for (i = 0; i < MTRR_TYPE_COUNT; i++) {
+ if (*typename == *mtrr_type_name[i])
+ type = i;
+ }
+ if (type == -1) {
+ printf("Invalid type name %s\n", typename);
+ return CMD_RET_USAGE;
+ }
+ start = simple_strtoul(argv[1], NULL, 16);
+ size = simple_strtoul(argv[2], NULL, 16);
+
+ base = start | type;
+ valid = native_read_msr(MTRR_PHYS_MASK_MSR(reg)) & MTRR_PHYS_MASK_VALID;
+ mask = ~((uint64_t)size - 1);
+ mask &= (1ULL << CONFIG_CPU_ADDR_BITS) - 1;
+ if (valid)
+ mask |= MTRR_PHYS_MASK_VALID;
+
+ printf("base=%llx, mask=%llx\n", base, mask);
+ mtrr_open(&state);
+ wrmsrl(MTRR_PHYS_BASE_MSR(reg), base);
+ wrmsrl(MTRR_PHYS_MASK_MSR(reg), mask);
+ mtrr_close(&state);
+
+ return 0;
+}
+
+static int mtrr_set_valid(int reg, bool valid)
+{
+ struct mtrr_state state;
+ uint64_t mask;
+
+ mtrr_open(&state);
+ mask = native_read_msr(MTRR_PHYS_MASK_MSR(reg));
+ if (valid)
+ mask |= MTRR_PHYS_MASK_VALID;
+ else
+ mask &= ~MTRR_PHYS_MASK_VALID;
+ wrmsrl(MTRR_PHYS_MASK_MSR(reg), mask);
+ mtrr_close(&state);
+
+ return 0;
+}
+
+static int do_mtrr(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ const char *cmd;
+ uint reg;
+
+ cmd = argv[1];
+ if (argc < 2 || *cmd == 'l')
+ return do_mtrr_list();
+ argc -= 2;
+ argv += 2;
+ if (argc <= 0)
+ return CMD_RET_USAGE;
+ reg = simple_strtoul(argv[0], NULL, 16);
+ if (reg >= MTRR_COUNT) {
+ printf("Invalid register number\n");
+ return CMD_RET_USAGE;
+ }
+ if (*cmd == 'e')
+ return mtrr_set_valid(reg, true);
+ else if (*cmd == 'd')
+ return mtrr_set_valid(reg, false);
+ else if (*cmd == 's')
+ return do_mtrr_set(reg, argc - 1, argv + 1);
+ else
+ return CMD_RET_USAGE;
+
+ return 0;
+}
+
+U_BOOT_CMD(
+ mtrr, 6, 1, do_mtrr,
+ "Use x86 memory type range registers (32-bit only)",
+ "[list] - list current registers\n"
+ "set <reg> <type> <start> <size> - set a register\n"
+ "\t<type> is Uncacheable, Combine, Through, Protect, Back\n"
+ "disable <reg> - disable a register\n"
+ "ensable <reg> - enable a register"
+);