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/*
* 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 <arch.h>
#include <arch_helpers.h>
#include <assert.h>
#include <platform_def.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)
static 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_t mmap[MAX_MMAP_REGIONS + 1];
static void print_mmap(void)
{
#if DEBUG_XLAT_TABLE
debug_print("mmap:\n");
mmap_region_t *mm = mmap;
while (mm->size) {
debug_print(" %010lx %010lx %10lx %x\n", mm->base_va,
mm->base_pa, mm->size, mm->attr);
++mm;
};
debug_print("\n");
#endif
}
void mmap_add_region(unsigned long base_pa, unsigned long base_va,
unsigned long size, unsigned attr)
{
mmap_region_t *mm = mmap;
mmap_region_t *mm_last = mm + sizeof(mmap) / sizeof(mmap[0]) - 1;
assert(IS_PAGE_ALIGNED(base_pa));
assert(IS_PAGE_ALIGNED(base_va));
assert(IS_PAGE_ALIGNED(size));
if (!size)
return;
/* Find correct place in mmap to insert new region */
while (mm->base_va < base_va && 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_pa = base_pa;
mm->base_va = base_va;
mm->size = size;
mm->attr = attr;
}
void mmap_add(const mmap_region_t *mm)
{
while (mm->size) {
mmap_add_region(mm->base_pa, mm->base_va, mm->size, mm->attr);
++mm;
}
}
static unsigned long mmap_desc(unsigned attr, unsigned long addr_pa,
unsigned level)
{
unsigned long desc = addr_pa;
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_t *mm, unsigned long base_va,
unsigned long size)
{
int attr = mm->attr;
for (;;) {
++mm;
if (!mm->size)
return attr; /* Reached end of list */
if (mm->base_va >= base_va + size)
return attr; /* Next region is after area so end */
if (mm->base_va + mm->size <= base_va)
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_va > base_va ||
mm->base_va + mm->size < base_va + size)
return -1; /* Region doesn't fully cover our area */
}
}
static mmap_region_t *init_xlation_table(mmap_region_t *mm,
unsigned long base_va,
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 long 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_va + mm->size <= base_va) {
/* Area now after the region so skip it */
++mm;
continue;
}
debug_print(" %010lx %8lx " + 6 - 2 * level, base_va,
level_size);
if (mm->base_va >= base_va + level_size) {
/* Next region is after area so nothing to map yet */
desc = INVALID_DESC;
} else if (mm->base_va <= base_va && mm->base_va + mm->size >=
base_va + level_size) {
/* Next region covers all of area */
int attr = mmap_region_attr(mm, base_va, level_size);
if (attr >= 0)
desc = mmap_desc(attr,
base_va - mm->base_va + mm->base_pa,
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_va,
new_table, level+1);
}
debug_print("\n");
*table++ = desc;
base_va += level_size;
} while (mm->size && (base_va & level_index_mask));
return mm;
}
void init_xlat_tables(void)
{
print_mmap();
init_xlation_table(mmap, 0, l1_xlation_table, 1);
}
/*******************************************************************************
* Macro generating the code for the function enabling the MMU in the given
* exception level, assuming that the pagetables have already been created.
*
* _el: Exception level at which the function will run
* _tcr_extra: Extra bits to set in the TCR register. This mask will
* be OR'ed with the default TCR value.
* _tlbi_fct: Function to invalidate the TLBs at the current
* exception level
******************************************************************************/
#define DEFINE_ENABLE_MMU_EL(_el, _tcr_extra, _tlbi_fct) \
void enable_mmu_el##_el(void) \
{ \
uint64_t mair, tcr, ttbr; \
uint32_t sctlr; \
\
assert(IS_IN_EL(_el)); \
assert((read_sctlr_el##_el() & SCTLR_M_BIT) == 0); \
\
/* Set attributes in the right indices of the MAIR */ \
mair = MAIR_ATTR_SET(ATTR_DEVICE, ATTR_DEVICE_INDEX); \
mair |= MAIR_ATTR_SET(ATTR_IWBWA_OWBWA_NTR, \
ATTR_IWBWA_OWBWA_NTR_INDEX); \
write_mair_el##_el(mair); \
\
/* Invalidate TLBs at the current exception level */ \
_tlbi_fct(); \
\
/* Set TCR bits as well. */ \
/* Inner & outer WBWA & shareable + T0SZ = 32 */ \
tcr = TCR_SH_INNER_SHAREABLE | TCR_RGN_OUTER_WBA | \
TCR_RGN_INNER_WBA | TCR_T0SZ_4GB; \
tcr |= _tcr_extra; \
write_tcr_el##_el(tcr); \
\
/* Set TTBR bits as well */ \
ttbr = (uint64_t) l1_xlation_table; \
write_ttbr0_el##_el(ttbr); \
\
/* Ensure all translation table writes have drained */ \
/* into memory, the TLB invalidation is complete, */ \
/* and translation register writes are committed */ \
/* before enabling the MMU */ \
dsb(); \
isb(); \
\
sctlr = read_sctlr_el##_el(); \
sctlr |= SCTLR_WXN_BIT | SCTLR_M_BIT | SCTLR_I_BIT; \
sctlr |= SCTLR_A_BIT | SCTLR_C_BIT; \
write_sctlr_el##_el(sctlr); \
\
/* Ensure the MMU enable takes effect immediately */ \
isb(); \
}
/* Define EL1 and EL3 variants of the function enabling the MMU */
DEFINE_ENABLE_MMU_EL(1, 0, tlbivmalle1)
DEFINE_ENABLE_MMU_EL(3, TCR_EL3_RES1, tlbialle3)