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bsps/arm: Add support for small pages MMU

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The small page MMU support reduces the granularity for memory settings
through the MMU from 1MiB sections to 4KiB small pages.

Enable it by default on the realview_pbx_a9_qemu BSP.
This commit is contained in:
Sebastian Huber
2019-10-31 09:48:05 +01:00
parent 3fb72b0f1e
commit f9648baf65
4 changed files with 103 additions and 30 deletions
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bsps/arm/include/bsp/arm-cp15-start.h
+48 -9
View File
@@ -9,7 +9,7 @@
/*
* Copyright (c) 2013 Hesham AL-Matary.
* Copyright (c) 2009-2014 embedded brains GmbH. All rights reserved.
* Copyright (c) 2009-2019 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
@@ -28,6 +28,7 @@
#include <libcpu/arm-cp15.h>
#include <bsp/start.h>
#include <bsp/linker-symbols.h>
#include <bspopts.h>
#ifdef __cplusplus
extern "C" {
@@ -106,16 +107,35 @@ arm_cp15_start_set_translation_table_entries(
const arm_cp15_start_section_config *config
)
{
uint32_t i = ARM_MMU_SECT_GET_INDEX(config->begin);
uint32_t iend =
ARM_MMU_SECT_GET_INDEX(ARM_MMU_SECT_MVA_ALIGN_UP(config->end));
uint32_t index_mask = (1U << (32 - ARM_MMU_SECT_BASE_SHIFT)) - 1U;
if (config->begin != config->end) {
uint32_t i;
uint32_t iend;
uint32_t index_mask;
uint32_t flags;
#ifdef ARM_MMU_USE_SMALL_PAGES
uint32_t *pt;
pt = &ttb[ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT];
i = ARM_MMU_SMALL_PAGE_GET_INDEX(config->begin);
iend = ARM_MMU_SMALL_PAGE_GET_INDEX(ARM_MMU_SECT_MVA_ALIGN_UP(config->end));
index_mask = (1U << (32 - ARM_MMU_SMALL_PAGE_BASE_SHIFT)) - 1U;
flags = ARM_MMU_SECT_FLAGS_TO_SMALL_PAGE(config->flags);
while (i != iend) {
ttb [i] = (i << ARM_MMU_SECT_BASE_SHIFT) | config->flags;
pt[i] = (i << ARM_MMU_SMALL_PAGE_BASE_SHIFT) | flags;
i = (i + 1U) & index_mask;
}
#else
i = ARM_MMU_SECT_GET_INDEX(config->begin);
iend = ARM_MMU_SECT_GET_INDEX(ARM_MMU_SECT_MVA_ALIGN_UP(config->end));
index_mask = (1U << (32 - ARM_MMU_SECT_BASE_SHIFT)) - 1U;
flags = config->flags;
while (i != iend) {
ttb[i] = (i << ARM_MMU_SECT_BASE_SHIFT) | flags;
i = (i + 1U) & index_mask;
}
#endif
}
}
@@ -127,16 +147,35 @@ arm_cp15_start_setup_translation_table(
size_t config_count
)
{
uint32_t dac = ARM_CP15_DAC_DOMAIN(client_domain, ARM_CP15_DAC_CLIENT);
#ifdef ARM_MMU_USE_SMALL_PAGES
uint32_t *pt;
#endif
uint32_t dac;
size_t i;
dac = ARM_CP15_DAC_DOMAIN(client_domain, ARM_CP15_DAC_CLIENT);
arm_cp15_set_domain_access_control(dac);
arm_cp15_set_translation_table_base(ttb);
/* Initialize translation table with invalid entries */
#ifdef ARM_MMU_USE_SMALL_PAGES
pt = &ttb[ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT];
for (i = 0; i < ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT; ++i) {
ttb [i] = 0;
size_t j;
for (j = 0; j < ARM_MMU_SMALL_PAGE_TABLE_ENTRY_COUNT; ++j) {
pt[j] = 0;
}
ttb[i] = (uint32_t) pt | (client_domain << ARM_MMU_SECT_DOMAIN_SHIFT)
| ARM_MMU_PAGE_TABLE_DEFAULT;
pt += ARM_MMU_SMALL_PAGE_TABLE_ENTRY_COUNT;
}
#else
for (i = 0; i < ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT; ++i) {
ttb[i] = 0;
}
#endif
for (i = 0; i < config_count; ++i) {
arm_cp15_start_set_translation_table_entries(ttb, &config_table [i]);