tests: kernel: App to validate boot time page table

tests/kernel/boot_page_table/CMakeLists.txt

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+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(NONE)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/kernel/boot_page_table/README.txt

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+Title: x86 boot time page table validation
+
+Description:
+
+This test is for x86 to validate boot time page table faults.
+Testcase outputs to console, for corresponding result, on validating
+boot page table.
+
+The checks are for param of the interested memory region
+that are value->p, value->us and value->rw. These are permissoin associated
+with the interested memory regions.
+
+--------------------------------------------------------------------------------
+
+Build and Run:
+
+This testcase will output to console.  It can be built and executed
+on QEMU as follows:
+
+    mkdir build && cd build
+    cmake -DBOARD=qemu_x86 ..
+    make run
+
+--------------------------------------------------------------------------------
+
+Troubleshooting/Problem Solving:
+
+Issues will occur if the object files and other related files generated from
+previous build are not discarded. In that scenario below step can be followed
+
+   make pristine	# remove old outdir directory
+			# discard results/files generated from previous build
+
+--------------------------------------------------------------------------------
+
+Sample Output:
+
+Running test suite boot_page_table_validate
+===================================================================
+starting test - test_boot_page_table
+PASS - test_boot_page_table.
+===================================================================
+===================================================================
+PROJECT EXECUTION SUCCESSFUL

tests/kernel/boot_page_table/prj.conf

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+CONFIG_ZTEST=y

tests/kernel/boot_page_table/src/boot_page_table.c

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+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <misc/printk.h>
+#include <mmustructs.h>
+#include <ztest.h>
+#include "boot_page_table.h"
+
+#define MEMORY_REG_NUM 4
+
+MMU_BOOT_REGION(START_ADDR_RANGE1, ADDR_SIZE, REGION_PERM);
+MMU_BOOT_REGION(START_ADDR_RANGE2, ADDR_SIZE, REGION_PERM);
+MMU_BOOT_REGION(START_ADDR_RANGE3, ADDR_SIZE, REGION_PERM);
+MMU_BOOT_REGION(START_ADDR_RANGE4, ADDR_SIZE, REGION_PERM);
+
+static int check_param(union x86_mmu_pae_pte *value, uint32_t perm)
+{
+	u32_t status = (value->rw  == ((perm & MMU_PTE_RW_MASK) >> 0x1));
+
+	status &= (value->us == ((perm & MMU_PTE_US_MASK) >> 0x2));
+	status &= value->p;
+	return status;
+}
+
+static int check_param_nonset_region(union x86_mmu_pae_pte *value,
+				     uint32_t perm)
+{
+	u32_t status = (value->rw  == 0);
+
+	status &= (value->us == 0);
+	status &= (value->p == 0);
+	return status;
+}
+
+static int  starting_addr_range(u32_t start_addr_range)
+{
+
+	u32_t addr_range, status = true;
+	union x86_mmu_pae_pte *value;
+
+	for (addr_range = start_addr_range; addr_range <=
+	     (start_addr_range + STARTING_ADDR_RANGE_LMT);
+	       addr_range += 0x1000) {
+		value = X86_MMU_GET_PTE(addr_range);
+		status &= check_param(value, REGION_PERM);
+		if (status == 0) {
+			printk("error at %d permissions %d\n",
+				addr_range, REGION_PERM);
+			TC_PRINT("%s failed\n", __func__);
+			return TC_FAIL;
+		}
+	}
+	return TC_PASS;
+}
+
+static int before_start_addr_range(u32_t start_addr_range)
+{
+	u32_t addr_range, status = true;
+	union x86_mmu_pae_pte *value;
+
+	for (addr_range = start_addr_range - 0x7000;
+	     addr_range < (start_addr_range); addr_range += 0x1000) {
+
+		value = X86_MMU_GET_PTE(addr_range);
+		status &= check_param_nonset_region(value,
+						    REGION_PERM);
+		if (status == 0) {
+			TC_PRINT("%s failed\n", __func__);
+			printk("error at %d permissions %d\n",
+				addr_range, REGION_PERM);
+			return TC_FAIL;
+
+		}
+	}
+	return TC_PASS;
+}
+
+static int ending_start_addr_range(u32_t start_addr_range)
+{
+	u32_t addr_range, status = true;
+	union x86_mmu_pae_pte *value;
+
+	for (addr_range = start_addr_range + ADDR_SIZE; addr_range <
+	     (start_addr_range + ADDR_SIZE + 0x10000);
+	       addr_range += 0x1000) {
+		value = X86_MMU_GET_PTE(addr_range);
+		status &= check_param_nonset_region(value, REGION_PERM);
+		if (status == 0) {
+			TC_PRINT("%s failed\n", __func__);
+			printk("error at %d permissions %d\n",
+				addr_range, REGION_PERM);
+			return TC_FAIL;
+
+		}
+	}
+	return TC_PASS;
+}
+
+int boot_page_table(void)
+{
+	u32_t start_addr_range;
+	int iterator = 0, check = 0;
+
+	for (iterator = 0; iterator < MEMORY_REG_NUM; iterator++) {
+		switch (iterator) {
+
+		case 0:
+			start_addr_range = START_ADDR_RANGE1;
+			break;
+
+		case 1:
+			start_addr_range = START_ADDR_RANGE2;
+			break;
+
+		case 2:
+			start_addr_range = START_ADDR_RANGE3;
+			break;
+
+		case 3:
+			start_addr_range = START_ADDR_RANGE4;
+			break;
+		default:
+			break;
+		}
+		check = starting_addr_range(start_addr_range);
+		if (check == TC_FAIL)
+			return TC_FAIL;
+		check = before_start_addr_range(start_addr_range);
+		if (check == TC_FAIL)
+			return TC_FAIL;
+		check = ending_start_addr_range(start_addr_range);
+		if (check == TC_FAIL)
+			return TC_FAIL;
+
+	}
+	return TC_PASS;
+}
+
+void test_boot_page_table(void)
+{
+	zassert_true(boot_page_table() == TC_PASS, NULL);
+}

tests/kernel/boot_page_table/src/boot_page_table.h

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+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef __BOOT_PAGE_TABLE_H__
+#define __BOOT_PAGE_TABLE_H__
+
+#ifndef X86_MMU_GET_PT_ADDR
+
+/* Helper macros to ease the usage of the MMU page table structures.
+ * Returns the Page table address for the particular address.
+ * Page Table address(returned value) is always 4KBytes aligned.
+ */
+#define X86_MMU_GET_PT_ADDR(addr) \
+	((struct x86_mmu_page_table *)\
+	 (X86_MMU_GET_PDE(addr)->page_table << MMU_PAGE_SHIFT))
+
+#endif
+
+#ifndef X86_MMU_GET_PTE
+/* Returns the page table entry for the addr
+ * use the union to extract page entry related information.
+ */
+
+#define X86_MMU_GET_PTE(addr)\
+	((union x86_mmu_pae_pte *)\
+	 (&X86_MMU_GET_PT_ADDR(addr)->entry[MMU_PAGE_NUM(addr)]))
+#endif
+
+#define MMU_READ                  0x00
+#define MMU_WRITE                 0x01
+#define MMU_READ_WRITE             (MMU_READ | MMU_WRITE)
+#define MMU_PAGE_USER             0x02
+#define START_ADDR_RANGE1         0x12300000
+#define START_ADDR_RANGE2         0x12340000
+#define START_ADDR_RANGE3         0x12400000
+#define START_ADDR_RANGE4         0x12460000
+#define ADDR_SIZE                 0x1000
+#define STARTING_ADDR_RANGE_LMT   0x0009ff
+#define START_ADR_RANGE_OVRLP_LMT 0x001000
+#define REGION_PERM                (MMU_READ_WRITE | MMU_PAGE_USER)
+#endif

tests/kernel/boot_page_table/src/main.c

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+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <ztest.h>
+extern void test_boot_page_table(void);
+
+void test_main(void)
+{
+	ztest_test_suite(boot_page_table_validate,
+			ztest_unit_test(test_boot_page_table));
+	ztest_run_test_suite(boot_page_table_validate);
+}

tests/kernel/boot_page_table/testcase.yaml

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+tests:
+-   test:
+        platform_whitelist: qemu_x86
+        platform_exclude: qemu_x86_nommu
+        tags: kernel