efDataDiscreteRateMining commandProcessing.c 李欣儒 commit at 2020-11-05

efDataDiscreteRateMining/externalListeningThread/commandProcessing.c

@@ -363,3 +363,131 @@ static void __init build_mem_type_table(void)
 
 	/*
 	 * Mark the device areas according to the CPU/architecture.
+	 */
+	if (cpu_is_xsc3() || (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP))) {
+		if (!cpu_is_xsc3()) {
+			/*
+			 * Mark device regions on ARMv6+ as execute-never
+			 * to prevent speculative instruction fetches.
+			 */
+			mem_types[MT_DEVICE].prot_sect |= PMD_SECT_XN;
+			mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_XN;
+			mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_XN;
+			mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_XN;
+		}
+		if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) {
+			/*
+			 * For ARMv7 with TEX remapping,
+			 * - shared device is SXCB=1100
+			 * - nonshared device is SXCB=0100
+			 * - write combine device mem is SXCB=0001
+			 * (Uncached Normal memory)
+			 */
+			mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1);
+			mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(1);
+			mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE;
+		} else if (cpu_is_xsc3()) {
+			/*
+			 * For Xscale3,
+			 * - shared device is TEXCB=00101
+			 * - nonshared device is TEXCB=01000
+			 * - write combine device mem is TEXCB=00100
+			 * (Inner/Outer Uncacheable in xsc3 parlance)
+			 */
+			mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1) | PMD_SECT_BUFFERED;
+			mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2);
+			mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
+		} else {
+			/*
+			 * For ARMv6 and ARMv7 without TEX remapping,
+			 * - shared device is TEXCB=00001
+			 * - nonshared device is TEXCB=01000
+			 * - write combine device mem is TEXCB=00100
+			 * (Uncached Normal in ARMv6 parlance).
+			 */
+			mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED;
+			mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2);
+			mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
+		}
+	} else {
+		/*
+		 * On others, write combining is "Uncached/Buffered"
+		 */
+		mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE;
+	}
+
+	/*
+	 * Now deal with the memory-type mappings
+	 */
+	cp = &cache_policies[cachepolicy];
+	vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;
+
+	/*
+	 * ARMv6 and above have extended page tables.
+	 */
+	if (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP)) {
+#ifndef CONFIG_ARM_LPAE
+		/*
+		 * Mark cache clean areas and XIP ROM read only
+		 * from SVC mode and no access from userspace.
+		 */
+		mem_types[MT_ROM].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
+		mem_types[MT_MINICLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
+		mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
+#endif
+
+		if (is_smp()) {
+			/*
+			 * Mark memory with the "shared" attribute
+			 * for SMP systems
+			 */
+			user_pgprot |= L_PTE_SHARED;
+			kern_pgprot |= L_PTE_SHARED;
+			vecs_pgprot |= L_PTE_SHARED;
+			mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_S;
+			mem_types[MT_DEVICE_WC].prot_pte |= L_PTE_SHARED;
+			mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_S;
+			mem_types[MT_DEVICE_CACHED].prot_pte |= L_PTE_SHARED;
+			mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
+			mem_types[MT_MEMORY].prot_pte |= L_PTE_SHARED;
+			mem_types[MT_MEMORY_DMA_READY].prot_pte |= L_PTE_SHARED;
+			mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_S;
+			mem_types[MT_MEMORY_NONCACHED].prot_pte |= L_PTE_SHARED;
+		}
+	}
+
+	/*
+	 * Non-cacheable Normal - intended for memory areas that must
+	 * not cause dirty cache line writebacks when used
+	 */
+	if (cpu_arch >= CPU_ARCH_ARMv6) {
+		if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) {
+			/* Non-cacheable Normal is XCB = 001 */
+			mem_types[MT_MEMORY_NONCACHED].prot_sect |=
+				PMD_SECT_BUFFERED;
+		} else {
+			/* For both ARMv6 and non-TEX-remapping ARMv7 */
+			mem_types[MT_MEMORY_NONCACHED].prot_sect |=
+				PMD_SECT_TEX(1);
+		}
+	} else {
+		mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_BUFFERABLE;
+	}
+
+#ifdef CONFIG_ARM_LPAE
+	/*
+	 * Do not generate access flag faults for the kernel mappings.
+	 */
+	for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
+		mem_types[i].prot_pte |= PTE_EXT_AF;
+		if (mem_types[i].prot_sect)
+			mem_types[i].prot_sect |= PMD_SECT_AF;
+	}
+	kern_pgprot |= PTE_EXT_AF;
+	vecs_pgprot |= PTE_EXT_AF;
+#endif
+
+	for (i = 0; i < 16; i++) {
+		pteval_t v = pgprot_val(protection_map[i]);
+		protection_map[i] = __pgprot(v | user_pgprot);
+	}