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

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+/*
+ * Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <platform_def.h>
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <lib/utils.h>
+#include <lib/xlat_tables/xlat_tables_arch.h>
+#include <lib/xlat_tables/xlat_tables.h>
+
+#include "../xlat_tables_private.h"
+
+#if (ARM_ARCH_MAJOR == 7) && !defined(ARMV7_SUPPORTS_LARGE_PAGE_ADDRESSING)
+#error ARMv7 target does not support LPAE MMU descriptors
+#endif
+
+#define XLAT_TABLE_LEVEL_BASE	\
+       GET_XLAT_TABLE_LEVEL_BASE(PLAT_VIRT_ADDR_SPACE_SIZE)
+
+#define NUM_BASE_LEVEL_ENTRIES	\
+       GET_NUM_BASE_LEVEL_ENTRIES(PLAT_VIRT_ADDR_SPACE_SIZE)
+
+static uint64_t base_xlation_table[NUM_BASE_LEVEL_ENTRIES]
+		__aligned(NUM_BASE_LEVEL_ENTRIES * sizeof(uint64_t));
+
+#if ENABLE_ASSERTIONS
+static unsigned long long get_max_supported_pa(void)
+{
+	/* Physical address space size for long descriptor format. */
+	return (1ULL << 40) - 1ULL;
+}
+#endif /* ENABLE_ASSERTIONS */
+
+unsigned int xlat_arch_current_el(void)
+{
+	/*
+	 * If EL3 is in AArch32 mode, all secure PL1 modes (Monitor, System,
+	 * SVC, Abort, UND, IRQ and FIQ modes) execute at EL3.
+	 */
+	return 3U;
+}
+
+uint64_t xlat_arch_get_xn_desc(unsigned int el __unused)
+{
+	return UPPER_ATTRS(XN);
+}
+
+void init_xlat_tables(void)
+{
+	unsigned long long max_pa;
+	uintptr_t max_va;
+
+	assert(PLAT_VIRT_ADDR_SPACE_SIZE >= MIN_VIRT_ADDR_SPACE_SIZE);
+	assert(PLAT_VIRT_ADDR_SPACE_SIZE <= MAX_VIRT_ADDR_SPACE_SIZE);
+	assert(IS_POWER_OF_TWO(PLAT_VIRT_ADDR_SPACE_SIZE));
+
+	print_mmap();
+	init_xlation_table(0U, base_xlation_table, XLAT_TABLE_LEVEL_BASE,
+						&max_va, &max_pa);
+
+	assert(max_va <= (PLAT_VIRT_ADDR_SPACE_SIZE - 1U));
+	assert(max_pa <= (PLAT_PHY_ADDR_SPACE_SIZE - 1U));
+	assert((PLAT_PHY_ADDR_SPACE_SIZE - 1U) <= get_max_supported_pa());
+}
+
+void enable_mmu_svc_mon(unsigned int flags)
+{
+	unsigned int mair0, ttbcr, sctlr;
+	uint64_t ttbr0;
+
+	assert(IS_IN_SECURE());
+	assert((read_sctlr() & SCTLR_M_BIT) == 0U);
+
+	/* Set attributes in the right indices of the MAIR */
+	mair0 = MAIR0_ATTR_SET(ATTR_DEVICE, ATTR_DEVICE_INDEX);
+	mair0 |= MAIR0_ATTR_SET(ATTR_IWBWA_OWBWA_NTR,
+			ATTR_IWBWA_OWBWA_NTR_INDEX);
+	mair0 |= MAIR0_ATTR_SET(ATTR_NON_CACHEABLE,
+			ATTR_NON_CACHEABLE_INDEX);
+	write_mair0(mair0);
+
+	/* Invalidate TLBs at the current exception level */
+	tlbiall();
+
+	/*
+	 * Set TTBCR bits as well. Set TTBR0 table properties. Disable TTBR1.
+	 */
+	int t0sz = 32 - __builtin_ctzll(PLAT_VIRT_ADDR_SPACE_SIZE);
+
+	if ((flags & XLAT_TABLE_NC) != 0U) {
+		/* Inner & outer non-cacheable non-shareable. */
+		ttbcr = TTBCR_EAE_BIT |
+			TTBCR_SH0_NON_SHAREABLE | TTBCR_RGN0_OUTER_NC |
+			TTBCR_RGN0_INNER_NC | (uint32_t) t0sz;
+	} else {
+		/* Inner & outer WBWA & shareable. */
+		ttbcr = TTBCR_EAE_BIT |
+			TTBCR_SH0_INNER_SHAREABLE | TTBCR_RGN0_OUTER_WBA |
+			TTBCR_RGN0_INNER_WBA | (uint32_t) t0sz;
+	}
+	ttbcr |= TTBCR_EPD1_BIT;
+	write_ttbcr(ttbcr);
+
+	/* Set TTBR0 bits as well */
+	ttbr0 = (uintptr_t) base_xlation_table;
+	write64_ttbr0(ttbr0);
+	write64_ttbr1(0U);
+
+	/*
+	 * Ensure all translation table writes have drained
+	 * into memory, the TLB invalidation is complete,
+	 * and translation register writes are committed
+	 * before enabling the MMU
+	 */
+	dsbish();
+	isb();
+
+	sctlr = read_sctlr();
+	sctlr |= SCTLR_WXN_BIT | SCTLR_M_BIT;
+
+	if ((flags & DISABLE_DCACHE) != 0U)
+		sctlr &= ~SCTLR_C_BIT;
+	else
+		sctlr |= SCTLR_C_BIT;
+
+	write_sctlr(sctlr);
+
+	/* Ensure the MMU enable takes effect immediately */
+	isb();
+}
+
+void enable_mmu_direct_svc_mon(unsigned int flags)
+{
+	enable_mmu_svc_mon(flags);
+}