GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/mips/mach-mscc/include/mach/tlb.h

@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * Copyright (c) 2018 Microsemi Corporation
+ */
+
+#ifndef __ASM_MACH_TLB_H
+#define __ASM_MACH_TLB_H
+
+#include <asm/mipsregs.h>
+#include <mach/common.h>
+#include <linux/sizes.h>
+
+#define TLB_HI_MASK      0xffffe000
+#define TLB_LO_MASK      0x3fffffff	/* Masks off Fill bits */
+#define TLB_LO_SHIFT     6	/* PFN Start bit */
+
+#define PAGEMASK_SHIFT   13
+
+#define MMU_PAGE_CACHED   (3 << 3)	/* C(5:3) Cache Coherency Attributes */
+#define MMU_PAGE_UNCACHED (2 << 3)	/* C(5:3) Cache Coherency Attributes */
+#define MMU_PAGE_DIRTY    BIT(2)	/* = Writeable */
+#define MMU_PAGE_VALID    BIT(1)
+#define MMU_PAGE_GLOBAL   BIT(0)
+#define MMU_REGIO_RO_C    (MMU_PAGE_CACHED | MMU_PAGE_VALID | MMU_PAGE_GLOBAL)
+#define MMU_REGIO_RO      (MMU_PAGE_UNCACHED | MMU_PAGE_VALID | MMU_PAGE_GLOBAL)
+#define MMU_REGIO_RW      (MMU_PAGE_DIRTY | MMU_REGIO_RO)
+#define MMU_REGIO_INVAL   (MMU_PAGE_GLOBAL)
+
+#define TLB_COUNT_MASK	  GENMASK(5, 0)
+#define TLB_COUNT_OFF	  25
+
+static inline u32 get_tlb_count(void)
+{
+	register u32 config1;
+
+	config1 = read_c0_config1();
+	config1 >>= TLB_COUNT_OFF;
+	config1 &= TLB_COUNT_MASK;
+
+	return 1 + config1;
+}
+
+static inline void create_tlb(int index, u32 offset, u32 size, u32 tlb_attrib1,
+			      u32 tlb_attrib2)
+{
+	register u32 tlb_mask, tlb_lo0, tlb_lo1;
+
+	tlb_mask = ((size >> 12) - 1) << PAGEMASK_SHIFT;
+	tlb_lo0 = tlb_attrib1 | (offset >> TLB_LO_SHIFT);
+	tlb_lo1 = tlb_attrib2 | ((offset + size) >> TLB_LO_SHIFT);
+
+	write_one_tlb(index, tlb_mask, offset & TLB_HI_MASK,
+		      tlb_lo0 & TLB_LO_MASK, tlb_lo1 & TLB_LO_MASK);
+}
+#endif				/* __ASM_MACH_TLB_H */