diff options
| -rw-r--r-- | include/aarch64/arch.h | 21 | ||||
| -rw-r--r-- | include/aarch64/xlat_tables.h | 66 | ||||
| -rw-r--r-- | lib/arch/aarch64/xlat_tables.c | 228 |
3 files changed, 314 insertions, 1 deletions
diff --git a/include/aarch64/arch.h b/include/aarch64/arch.h index 6630a1a..3e67282 100644 --- a/include/aarch64/arch.h +++ b/include/aarch64/arch.h @@ -259,7 +259,26 @@ #define OSH (0x2 << 6) #define ISH (0x3 << 6) -#define IS_PAGE_ALIGNED(addr) (((addr) & 0xFFF) == 0) +#define PAGE_SIZE_SHIFT FOUR_KB_SHIFT +#define PAGE_SIZE (1 << PAGE_SIZE_SHIFT) +#define PAGE_SIZE_MASK (PAGE_SIZE - 1) +#define IS_PAGE_ALIGNED(addr) (((addr) & PAGE_SIZE_MASK) == 0) + +#define XLAT_ENTRY_SIZE_SHIFT 3 /* Each MMU table entry is 8 bytes (1 << 3) */ +#define XLAT_ENTRY_SIZE (1 << XLAT_ENTRY_SIZE_SHIFT) + +#define XLAT_TABLE_SIZE_SHIFT PAGE_SIZE_SHIFT +#define XLAT_TABLE_SIZE (1 << XLAT_TABLE_SIZE_SHIFT) + +/* Values for number of entries in each MMU translation table */ +#define XLAT_TABLE_ENTRIES_SHIFT (XLAT_TABLE_SIZE_SHIFT - XLAT_ENTRY_SIZE_SHIFT) +#define XLAT_TABLE_ENTRIES (1 << XLAT_TABLE_ENTRIES_SHIFT) +#define XLAT_TABLE_ENTRIES_MASK (XLAT_TABLE_ENTRIES - 1) + +/* Values to convert a memory address to an index into a translation table */ +#define L3_XLAT_ADDRESS_SHIFT PAGE_SIZE_SHIFT +#define L2_XLAT_ADDRESS_SHIFT (L3_XLAT_ADDRESS_SHIFT + XLAT_TABLE_ENTRIES_SHIFT) +#define L1_XLAT_ADDRESS_SHIFT (L2_XLAT_ADDRESS_SHIFT + XLAT_TABLE_ENTRIES_SHIFT) /* * AP[1] bit is ignored by hardware and is diff --git a/include/aarch64/xlat_tables.h b/include/aarch64/xlat_tables.h new file mode 100644 index 0000000..f7b7740 --- /dev/null +++ b/include/aarch64/xlat_tables.h @@ -0,0 +1,66 @@ +/* + * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <stdint.h> + +/* + * Flags for building up memory mapping attributes. + * These are organised so that a clear bit gives a more restrictive mapping + * that a set bit, that way a bitwise-and two sets of attributes will never give + * an attribute which has greater access rights that any of the original + * attributes. + */ +typedef enum { + MT_DEVICE = 0 << 0, + MT_MEMORY = 1 << 0, + + MT_RO = 0 << 1, + MT_RW = 1 << 1, + + MT_SECURE = 0 << 2, + MT_NS = 1 << 2 +} mmap_attr; + +/* + * Structure for specifying a single region of memory. + */ +typedef struct { + unsigned long base; + unsigned long size; + mmap_attr attr; +} mmap_region; + +extern void mmap_add_region(unsigned long base, unsigned long size, + unsigned attr); +extern void mmap_add(const mmap_region *mm); + +extern void init_xlat_tables(void); + +extern uint64_t l1_xlation_table[]; diff --git a/lib/arch/aarch64/xlat_tables.c b/lib/arch/aarch64/xlat_tables.c new file mode 100644 index 0000000..33a8b6d --- /dev/null +++ b/lib/arch/aarch64/xlat_tables.c @@ -0,0 +1,228 @@ +/* + * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <assert.h> +#include <platform.h> +#include <string.h> +#include <xlat_tables.h> + + +#ifndef DEBUG_XLAT_TABLE +#define DEBUG_XLAT_TABLE 0 +#endif + +#if DEBUG_XLAT_TABLE +#define debug_print(...) printf(__VA_ARGS__) +#else +#define debug_print(...) ((void)0) +#endif + + +#define UNSET_DESC ~0ul + +#define NUM_L1_ENTRIES (ADDR_SPACE_SIZE >> L1_XLAT_ADDRESS_SHIFT) + +uint64_t l1_xlation_table[NUM_L1_ENTRIES] +__aligned(NUM_L1_ENTRIES * sizeof(uint64_t)); + +static uint64_t xlat_tables[MAX_XLAT_TABLES][XLAT_TABLE_ENTRIES] +__aligned(XLAT_TABLE_SIZE) __attribute__((section("xlat_table"))); + +static unsigned next_xlat; + +/* + * Array of all memory regions stored in order of ascending base address. + * The list is terminated by the first entry with size == 0. + */ +static mmap_region mmap[MAX_MMAP_REGIONS + 1]; + + +static void print_mmap(void) +{ +#if DEBUG_XLAT_TABLE + debug_print("mmap:\n"); + mmap_region *mm = mmap; + while (mm->size) { + debug_print(" %010lx %10lx %x\n", mm->base, mm->size, mm->attr); + ++mm; + }; + debug_print("\n"); +#endif +} + +void mmap_add_region(unsigned long base, unsigned long size, unsigned attr) +{ + mmap_region *mm = mmap; + mmap_region *mm_last = mm + sizeof(mmap) / sizeof(mmap[0]) - 1; + + assert(IS_PAGE_ALIGNED(base)); + assert(IS_PAGE_ALIGNED(size)); + + if (!size) + return; + + /* Find correct place in mmap to insert new region */ + while (mm->base < base && mm->size) + ++mm; + + /* Make room for new region by moving other regions up by one place */ + memmove(mm + 1, mm, (uintptr_t)mm_last - (uintptr_t)mm); + + /* Check we haven't lost the empty sentinal from the end of the array */ + assert(mm_last->size == 0); + + mm->base = base; + mm->size = size; + mm->attr = attr; +} + +void mmap_add(const mmap_region *mm) +{ + while (mm->size) { + mmap_add_region(mm->base, mm->size, mm->attr); + ++mm; + } +} + +static unsigned long mmap_desc(unsigned attr, unsigned long addr, + unsigned level) +{ + unsigned long desc = addr; + + desc |= level == 3 ? TABLE_DESC : BLOCK_DESC; + + desc |= attr & MT_NS ? LOWER_ATTRS(NS) : 0; + + desc |= attr & MT_RW ? LOWER_ATTRS(AP_RW) : LOWER_ATTRS(AP_RO); + + desc |= LOWER_ATTRS(ACCESS_FLAG); + + if (attr & MT_MEMORY) { + desc |= LOWER_ATTRS(ATTR_IWBWA_OWBWA_NTR_INDEX | ISH); + if (attr & MT_RW) + desc |= UPPER_ATTRS(XN); + } else { + desc |= LOWER_ATTRS(ATTR_DEVICE_INDEX | OSH); + desc |= UPPER_ATTRS(XN); + } + + debug_print(attr & MT_MEMORY ? "MEM" : "DEV"); + debug_print(attr & MT_RW ? "-RW" : "-RO"); + debug_print(attr & MT_NS ? "-NS" : "-S"); + + return desc; +} + +static int mmap_region_attr(mmap_region *mm, unsigned long base, + unsigned long size) +{ + int attr = mm->attr; + + for (;;) { + ++mm; + + if (!mm->size) + return attr; /* Reached end of list */ + + if (mm->base >= base + size) + return attr; /* Next region is after area so end */ + + if (mm->base + mm->size <= base) + continue; /* Next region has already been overtaken */ + + if ((mm->attr & attr) == attr) + continue; /* Region doesn't override attribs so skip */ + + attr &= mm->attr; + + if (mm->base > base || mm->base + mm->size < base + size) + return -1; /* Region doesn't fully cover our area */ + } +} + +static mmap_region *init_xlation_table(mmap_region *mm, unsigned long base, + unsigned long *table, unsigned level) +{ + unsigned level_size_shift = L1_XLAT_ADDRESS_SHIFT - (level - 1) * + XLAT_TABLE_ENTRIES_SHIFT; + unsigned level_size = 1 << level_size_shift; + unsigned level_index_mask = XLAT_TABLE_ENTRIES_MASK << level_size_shift; + + assert(level <= 3); + + debug_print("New xlat table:\n"); + + do { + unsigned long desc = UNSET_DESC; + + if (mm->base + mm->size <= base) { + /* Area now after the region so skip it */ + ++mm; + continue; + } + + debug_print(" %010lx %8lx " + 6 - 2 * level, base, level_size); + + if (mm->base >= base + level_size) { + /* Next region is after area so nothing to map yet */ + desc = INVALID_DESC; + } else if (mm->base <= base && + mm->base + mm->size >= base + level_size) { + /* Next region covers all of area */ + int attr = mmap_region_attr(mm, base, level_size); + if (attr >= 0) + desc = mmap_desc(attr, base, level); + } + /* else Next region only partially covers area, so need */ + + if (desc == UNSET_DESC) { + /* Area not covered by a region so need finer table */ + unsigned long *new_table = xlat_tables[next_xlat++]; + assert(next_xlat <= MAX_XLAT_TABLES); + desc = TABLE_DESC | (unsigned long)new_table; + + /* Recurse to fill in new table */ + mm = init_xlation_table(mm, base, new_table, level+1); + } + + debug_print("\n"); + + *table++ = desc; + base += level_size; + } while (mm->size && (base & level_index_mask)); + + return mm; +} + +void init_xlat_tables(void) +{ + print_mmap(); + init_xlation_table(mmap, 0, l1_xlation_table, 1); +} |