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/*
* Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <stdint.h>
#include <platform_def.h>
#include <arch.h>
#include <arch_features.h>
#include <common/bl_common.h>
#include <lib/utils.h>
#include <lib/xlat_tables/xlat_tables.h>
#include <lib/xlat_tables/xlat_tables_arch.h>
#include <plat/common/common_def.h>
#include "../xlat_tables_private.h"
#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));
static unsigned long long tcr_ps_bits;
static unsigned long long calc_physical_addr_size_bits(
unsigned long long max_addr)
{
/* Physical address can't exceed 48 bits */
assert((max_addr & ADDR_MASK_48_TO_63) == 0U);
/* 48 bits address */
if ((max_addr & ADDR_MASK_44_TO_47) != 0U)
return TCR_PS_BITS_256TB;
/* 44 bits address */
if ((max_addr & ADDR_MASK_42_TO_43) != 0U)
return TCR_PS_BITS_16TB;
/* 42 bits address */
if ((max_addr & ADDR_MASK_40_TO_41) != 0U)
return TCR_PS_BITS_4TB;
/* 40 bits address */
if ((max_addr & ADDR_MASK_36_TO_39) != 0U)
return TCR_PS_BITS_1TB;
/* 36 bits address */
if ((max_addr & ADDR_MASK_32_TO_35) != 0U)
return TCR_PS_BITS_64GB;
return TCR_PS_BITS_4GB;
}
#if ENABLE_ASSERTIONS
/*
* Physical Address ranges supported in the AArch64 Memory Model. Value 0b110 is
* supported in ARMv8.2 onwards.
*/
static const unsigned int pa_range_bits_arr[] = {
PARANGE_0000, PARANGE_0001, PARANGE_0010, PARANGE_0011, PARANGE_0100,
PARANGE_0101, PARANGE_0110
};
static unsigned long long get_max_supported_pa(void)
{
u_register_t pa_range = read_id_aa64mmfr0_el1() &
ID_AA64MMFR0_EL1_PARANGE_MASK;
/* All other values are reserved */
assert(pa_range < ARRAY_SIZE(pa_range_bits_arr));
return (1ULL << pa_range_bits_arr[pa_range]) - 1ULL;
}
/*
* Return minimum virtual address space size supported by the architecture
*/
static uintptr_t xlat_get_min_virt_addr_space_size(void)
{
uintptr_t ret;
if (is_armv8_4_ttst_present())
ret = MIN_VIRT_ADDR_SPACE_SIZE_TTST;
else
ret = MIN_VIRT_ADDR_SPACE_SIZE;
return ret;
}
#endif /* ENABLE_ASSERTIONS */
unsigned int xlat_arch_current_el(void)
{
unsigned int el = (unsigned int)GET_EL(read_CurrentEl());
assert(el > 0U);
return el;
}
uint64_t xlat_arch_get_xn_desc(unsigned int el)
{
if (el == 3U) {
return UPPER_ATTRS(XN);
} else {
assert(el == 1U);
return UPPER_ATTRS(PXN);
}
}
void init_xlat_tables(void)
{
unsigned long long max_pa;
uintptr_t max_va;
assert(PLAT_VIRT_ADDR_SPACE_SIZE >=
(xlat_get_min_virt_addr_space_size() - 1U));
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());
tcr_ps_bits = calc_physical_addr_size_bits(max_pa);
}
/*******************************************************************************
* 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(unsigned int flags) \
{ \
uint64_t mair, tcr, ttbr; \
uint32_t sctlr; \
\
assert(IS_IN_EL(_el)); \
assert((read_sctlr_el##_el() & SCTLR_M_BIT) == 0U); \
\
/* 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); \
mair |= MAIR_ATTR_SET(ATTR_NON_CACHEABLE, \
ATTR_NON_CACHEABLE_INDEX); \
write_mair_el##_el(mair); \
\
/* Invalidate TLBs at the current exception level */ \
_tlbi_fct(); \
\
/* Set TCR bits as well. */ \
/* Set T0SZ to (64 - width of virtual address space) */ \
int t0sz = 64 - __builtin_ctzll(PLAT_VIRT_ADDR_SPACE_SIZE);\
\
if ((flags & XLAT_TABLE_NC) != 0U) { \
/* Inner & outer non-cacheable non-shareable. */\
tcr = TCR_SH_NON_SHAREABLE | \
TCR_RGN_OUTER_NC | TCR_RGN_INNER_NC | \
(uint64_t) t0sz; \
} else { \
/* Inner & outer WBWA & shareable. */ \
tcr = TCR_SH_INNER_SHAREABLE | \
TCR_RGN_OUTER_WBA | TCR_RGN_INNER_WBA | \
(uint64_t) t0sz; \
} \
tcr |= _tcr_extra; \
write_tcr_el##_el(tcr); \
\
/* Set TTBR bits as well */ \
ttbr = (uint64_t) base_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 */ \
dsbish(); \
isb(); \
\
sctlr = read_sctlr_el##_el(); \
sctlr |= SCTLR_WXN_BIT | SCTLR_M_BIT; \
\
if ((flags & DISABLE_DCACHE) != 0U) \
sctlr &= ~SCTLR_C_BIT; \
else \
sctlr |= SCTLR_C_BIT; \
\
write_sctlr_el##_el(sctlr); \
\
/* Ensure the MMU enable takes effect immediately */ \
isb(); \
} \
\
void enable_mmu_direct_el##_el(unsigned int flags) \
{ \
enable_mmu_el##_el(flags); \
}
/* Define EL1 and EL3 variants of the function enabling the MMU */
DEFINE_ENABLE_MMU_EL(1,
/*
* TCR_EL1.EPD1: Disable translation table walk for addresses
* that are translated using TTBR1_EL1.
*/
TCR_EPD1_BIT | (tcr_ps_bits << TCR_EL1_IPS_SHIFT),
tlbivmalle1)
DEFINE_ENABLE_MMU_EL(3,
TCR_EL3_RES1 | (tcr_ps_bits << TCR_EL3_PS_SHIFT),
tlbialle3)