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esp-idf/components/spi_flash/flash_mmap.c

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <freertos/semphr.h>
#include <soc/soc.h>
#include <soc/dport_reg.h>
#include <soc/soc_memory_layout.h>
#include "sdkconfig.h"
#include "esp_attr.h"
#include "esp_spi_flash.h"
#include "esp_flash_encrypt.h"
#include "esp_log.h"
#include "cache_utils.h"
#if CONFIG_IDF_TARGET_ESP32
#include "esp32/rom/spi_flash.h"
#include "esp32/rom/cache.h"
#include "esp32/spiram.h"
#elif CONFIG_IDF_TARGET_ESP32S2
#include "esp32s2/rom/spi_flash.h"
#include "esp32s2/rom/cache.h"
#include "esp32s2/spiram.h"
#include "soc/extmem_reg.h"
#include "soc/cache_memory.h"
#endif
#ifndef NDEBUG
// Enable built-in checks in queue.h in debug builds
#define INVARIANTS
#endif
#include "sys/queue.h"
#ifdef CONFIG_IDF_TARGET_ESP32
#define REGIONS_COUNT 4
#define IROM0_PAGES_START 64
#define IROM0_PAGES_END 256
#define DROM0_PAGES_START 0
#define DROM0_PAGES_END 64
#define PAGE_IN_FLASH(page) (page)
#define INVALID_ENTRY_VAL DPORT_FLASH_MMU_TABLE_INVALID_VAL
#define MMU_ADDR_MASK DPORT_MMU_ADDRESS_MASK
#elif CONFIG_IDF_TARGET_ESP32S2
#define REGIONS_COUNT 6
#define IROM0_PAGES_START (PRO_CACHE_IBUS0_MMU_START / sizeof(uint32_t))
#define IROM0_PAGES_END (PRO_CACHE_IBUS1_MMU_END / sizeof(uint32_t))
#define DROM0_PAGES_START (PRO_CACHE_IBUS2_MMU_START / sizeof(uint32_t))
#define DROM0_PAGES_END (PRO_CACHE_IBUS2_MMU_END / sizeof(uint32_t))
#define DPORT_PRO_FLASH_MMU_TABLE FLASH_MMU_TABLE
#define INVALID_ENTRY_VAL MMU_TABLE_INVALID_VAL
#define MMU_ADDR_MASK MMU_ADDRESS_MASK
#define PAGE_IN_FLASH(page) ((page) | MMU_ACCESS_FLASH)
#endif
#define PAGES_PER_REGION 64
#define IROM0_PAGES_NUM (IROM0_PAGES_END - IROM0_PAGES_START)
#define DROM0_PAGES_NUM (DROM0_PAGES_END - DROM0_PAGES_START)
#define PAGES_LIMIT (IROM0_PAGES_END > DROM0_PAGES_END ? IROM0_PAGES_END:DROM0_PAGES_END)
#define VADDR0_START_ADDR SOC_DROM_LOW
#define VADDR1_START_ADDR 0x40000000
#define VADDR1_FIRST_USABLE_ADDR SOC_IROM_LOW
#define PRO_IRAM0_FIRST_USABLE_PAGE ((VADDR1_FIRST_USABLE_ADDR - VADDR1_START_ADDR) / SPI_FLASH_MMU_PAGE_SIZE + IROM0_PAGES_START)
typedef struct mmap_entry_{
uint32_t handle;
int page;
int count;
LIST_ENTRY(mmap_entry_) entries;
} mmap_entry_t;
static LIST_HEAD(mmap_entries_head, mmap_entry_) s_mmap_entries_head =
LIST_HEAD_INITIALIZER(s_mmap_entries_head);
static uint8_t s_mmap_page_refcnt[REGIONS_COUNT * PAGES_PER_REGION] = {0};
static uint32_t s_mmap_last_handle = 0;
static void IRAM_ATTR spi_flash_mmap_init(void)
{
if (s_mmap_page_refcnt[DROM0_PAGES_START] != 0) {
return; /* mmap data already initialised */
}
DPORT_INTERRUPT_DISABLE();
for (int i = 0; i < REGIONS_COUNT * PAGES_PER_REGION; ++i) {
uint32_t entry_pro = DPORT_SEQUENCE_REG_READ((uint32_t)&DPORT_PRO_FLASH_MMU_TABLE[i]);
#if !CONFIG_FREERTOS_UNICORE
uint32_t entry_app = DPORT_SEQUENCE_REG_READ((uint32_t)&DPORT_APP_FLASH_MMU_TABLE[i]);
if (entry_pro != entry_app) {
// clean up entries used by boot loader
entry_pro = INVALID_ENTRY_VAL;
DPORT_PRO_FLASH_MMU_TABLE[i] = INVALID_ENTRY_VAL;
}
#endif
if ((entry_pro & INVALID_ENTRY_VAL) == 0 && (i == DROM0_PAGES_START || i == PRO_IRAM0_FIRST_USABLE_PAGE || entry_pro != 0)) {
s_mmap_page_refcnt[i] = 1;
} else {
DPORT_PRO_FLASH_MMU_TABLE[i] = INVALID_ENTRY_VAL;
#if !CONFIG_FREERTOS_UNICORE
DPORT_APP_FLASH_MMU_TABLE[i] = INVALID_ENTRY_VAL;
#endif
}
}
DPORT_INTERRUPT_RESTORE();
}
static void IRAM_ATTR get_mmu_region(spi_flash_mmap_memory_t memory, int* out_begin, int* out_size,uint32_t* region_addr)
{
if (memory == SPI_FLASH_MMAP_DATA) {
// Vaddr0
*out_begin = DROM0_PAGES_START;
*out_size = DROM0_PAGES_NUM;
*region_addr = VADDR0_START_ADDR;
} else {
// only part of VAddr1 is usable, so adjust for that
*out_begin = PRO_IRAM0_FIRST_USABLE_PAGE;
*out_size = IROM0_PAGES_END - *out_begin;
*region_addr = VADDR1_FIRST_USABLE_ADDR;
}
}
esp_err_t IRAM_ATTR spi_flash_mmap(size_t src_addr, size_t size, spi_flash_mmap_memory_t memory,
const void** out_ptr, spi_flash_mmap_handle_t* out_handle)
{
esp_err_t ret;
if (src_addr & 0xffff) {
return ESP_ERR_INVALID_ARG;
}
if (src_addr + size > g_rom_flashchip.chip_size) {
return ESP_ERR_INVALID_ARG;
}
// region which should be mapped
int phys_page = src_addr / SPI_FLASH_MMU_PAGE_SIZE;
int page_count = (size + SPI_FLASH_MMU_PAGE_SIZE - 1) / SPI_FLASH_MMU_PAGE_SIZE;
// prepare a linear pages array to feed into spi_flash_mmap_pages
int *pages = heap_caps_malloc(sizeof(int)*page_count, MALLOC_CAP_INTERNAL);
if (pages == NULL) {
return ESP_ERR_NO_MEM;
}
for (int i = 0; i < page_count; i++) {
pages[i] = (phys_page+i);
}
ret = spi_flash_mmap_pages(pages, page_count, memory, out_ptr, out_handle);
free(pages);
return ret;
}
esp_err_t IRAM_ATTR spi_flash_mmap_pages(const int *pages, size_t page_count, spi_flash_mmap_memory_t memory,
const void** out_ptr, spi_flash_mmap_handle_t* out_handle)
{
esp_err_t ret;
bool need_flush = false;
if (!page_count) {
return ESP_ERR_INVALID_ARG;
}
if (!esp_ptr_internal(pages)) {
return ESP_ERR_INVALID_ARG;
}
for (int i = 0; i < page_count; i++) {
if (pages[i] < 0 || pages[i]*SPI_FLASH_MMU_PAGE_SIZE >= g_rom_flashchip.chip_size) {
return ESP_ERR_INVALID_ARG;
}
}
mmap_entry_t* new_entry = (mmap_entry_t*) heap_caps_malloc(sizeof(mmap_entry_t), MALLOC_CAP_INTERNAL|MALLOC_CAP_8BIT);
if (new_entry == 0) {
return ESP_ERR_NO_MEM;
}
spi_flash_disable_interrupts_caches_and_other_cpu();
spi_flash_mmap_init();
// figure out the memory region where we should look for pages
int region_begin; // first page to check
int region_size; // number of pages to check
uint32_t region_addr; // base address of memory region
get_mmu_region(memory,&region_begin,&region_size,&region_addr);
if (region_size < page_count) {
spi_flash_enable_interrupts_caches_and_other_cpu();
return ESP_ERR_NO_MEM;
}
// The following part searches for a range of MMU entries which can be used.
// Algorithm is essentially naïve strstr algorithm, except that unused MMU
// entries are treated as wildcards.
int start;
// the " + 1" is a fix when loop the MMU table pages, because the last MMU page
// is valid as well if it have not been used
int end = region_begin + region_size - page_count + 1;
for (start = region_begin; start < end; ++start) {
int pageno = 0;
int pos;
DPORT_INTERRUPT_DISABLE();
for (pos = start; pos < start + page_count; ++pos, ++pageno) {
int table_val = (int) DPORT_SEQUENCE_REG_READ((uint32_t)&DPORT_PRO_FLASH_MMU_TABLE[pos]);
uint8_t refcnt = s_mmap_page_refcnt[pos];
if (refcnt != 0 && table_val != PAGE_IN_FLASH(pages[pageno])) {
break;
}
}
DPORT_INTERRUPT_RESTORE();
// whole mapping range matched, bail out
if (pos - start == page_count) {
break;
}
}
// checked all the region(s) and haven't found anything?
if (start == end) {
*out_handle = 0;
*out_ptr = NULL;
ret = ESP_ERR_NO_MEM;
} else {
// set up mapping using pages
uint32_t pageno = 0;
DPORT_INTERRUPT_DISABLE();
for (int i = start; i != start + page_count; ++i, ++pageno) {
// sanity check: we won't reconfigure entries with non-zero reference count
uint32_t entry_pro = DPORT_SEQUENCE_REG_READ((uint32_t)&DPORT_PRO_FLASH_MMU_TABLE[i]);
#if !CONFIG_FREERTOS_UNICORE
uint32_t entry_app = DPORT_SEQUENCE_REG_READ((uint32_t)&DPORT_APP_FLASH_MMU_TABLE[i]);
#endif
assert(s_mmap_page_refcnt[i] == 0 ||
(entry_pro == PAGE_IN_FLASH(pages[pageno])
#if !CONFIG_FREERTOS_UNICORE
&& entry_app == PAGE_IN_FLASH(pages[pageno])
#endif
));
if (s_mmap_page_refcnt[i] == 0) {
if (entry_pro != PAGE_IN_FLASH(pages[pageno])
#if !CONFIG_FREERTOS_UNICORE
|| entry_app != PAGE_IN_FLASH(pages[pageno])
#endif
) {
DPORT_PRO_FLASH_MMU_TABLE[i] = PAGE_IN_FLASH(pages[pageno]);
#if !CONFIG_FREERTOS_UNICORE
DPORT_APP_FLASH_MMU_TABLE[i] = pages[pageno];
#endif
#if CONFIG_IDF_TARGET_ESP32S2
Cache_Invalidate_Addr(region_addr + (i - region_begin) * SPI_FLASH_MMU_PAGE_SIZE, SPI_FLASH_MMU_PAGE_SIZE);
#endif
need_flush = true;
}
}
++s_mmap_page_refcnt[i];
}
DPORT_INTERRUPT_RESTORE();
LIST_INSERT_HEAD(&s_mmap_entries_head, new_entry, entries);
new_entry->page = start;
new_entry->count = page_count;
new_entry->handle = ++s_mmap_last_handle;
*out_handle = new_entry->handle;
*out_ptr = (void*) (region_addr + (start - region_begin) * SPI_FLASH_MMU_PAGE_SIZE);
ret = ESP_OK;
}
/* This is a temporary fix for an issue where some
cache reads may see stale data.
Working on a long term fix that doesn't require invalidating
entire cache.
*/
if (need_flush) {
#if CONFIG_IDF_TARGET_ESP32
# if CONFIG_SPIRAM
esp_spiram_writeback_cache();
# endif
Cache_Flush(0);
# if !CONFIG_FREERTOS_UNICORE
Cache_Flush(1);
# endif
#endif
}
spi_flash_enable_interrupts_caches_and_other_cpu();
if (*out_ptr == NULL) {
free(new_entry);
}
return ret;
}
void IRAM_ATTR spi_flash_munmap(spi_flash_mmap_handle_t handle)
{
spi_flash_disable_interrupts_caches_and_other_cpu();
mmap_entry_t* it;
// look for handle in linked list
for (it = LIST_FIRST(&s_mmap_entries_head); it != NULL; it = LIST_NEXT(it, entries)) {
if (it->handle == handle) {
// for each page, decrement reference counter
// if reference count is zero, disable MMU table entry to
// facilitate debugging of use-after-free conditions
for (int i = it->page; i < it->page + it->count; ++i) {
assert(s_mmap_page_refcnt[i] > 0);
if (--s_mmap_page_refcnt[i] == 0) {
DPORT_PRO_FLASH_MMU_TABLE[i] = INVALID_ENTRY_VAL;
#if !CONFIG_FREERTOS_UNICORE
DPORT_APP_FLASH_MMU_TABLE[i] = INVALID_ENTRY_VAL;
#endif
}
}
LIST_REMOVE(it, entries);
break;
}
}
spi_flash_enable_interrupts_caches_and_other_cpu();
if (it == NULL) {
assert(0 && "invalid handle, or handle already unmapped");
}
free(it);
}
static void IRAM_ATTR NOINLINE_ATTR spi_flash_protected_mmap_init(void)
{
spi_flash_disable_interrupts_caches_and_other_cpu();
spi_flash_mmap_init();
spi_flash_enable_interrupts_caches_and_other_cpu();
}
static uint32_t IRAM_ATTR NOINLINE_ATTR spi_flash_protected_read_mmu_entry(int index)
{
uint32_t value;
spi_flash_disable_interrupts_caches_and_other_cpu();
value = DPORT_REG_READ((uint32_t)&DPORT_PRO_FLASH_MMU_TABLE[index]);
spi_flash_enable_interrupts_caches_and_other_cpu();
return value;
}
void spi_flash_mmap_dump(void)
{
spi_flash_protected_mmap_init();
mmap_entry_t* it;
for (it = LIST_FIRST(&s_mmap_entries_head); it != NULL; it = LIST_NEXT(it, entries)) {
printf("handle=%d page=%d count=%d\n", it->handle, it->page, it->count);
}
for (int i = 0; i < REGIONS_COUNT * PAGES_PER_REGION; ++i) {
if (s_mmap_page_refcnt[i] != 0) {
uint32_t paddr = spi_flash_protected_read_mmu_entry(i);
printf("page %d: refcnt=%d paddr=%d\n", i, (int) s_mmap_page_refcnt[i], paddr);
}
}
}
uint32_t IRAM_ATTR spi_flash_mmap_get_free_pages(spi_flash_mmap_memory_t memory)
{
spi_flash_disable_interrupts_caches_and_other_cpu();
spi_flash_mmap_init();
int count = 0;
int region_begin; // first page to check
int region_size; // number of pages to check
uint32_t region_addr; // base address of memory region
get_mmu_region(memory,&region_begin,&region_size,&region_addr);
DPORT_INTERRUPT_DISABLE();
for (int i = region_begin; i < region_begin + region_size; ++i) {
if (s_mmap_page_refcnt[i] == 0 && DPORT_SEQUENCE_REG_READ((uint32_t)&DPORT_PRO_FLASH_MMU_TABLE[i]) == INVALID_ENTRY_VAL) {
count++;
}
}
DPORT_INTERRUPT_RESTORE();
spi_flash_enable_interrupts_caches_and_other_cpu();
return count;
}
uint32_t spi_flash_cache2phys(const void *cached)
{
intptr_t c = (intptr_t)cached;
size_t cache_page;
int offset = 0;
if (c >= VADDR1_START_ADDR && c < VADDR1_FIRST_USABLE_ADDR) {
/* IRAM address, doesn't map to flash */
return SPI_FLASH_CACHE2PHYS_FAIL;
} else if (c < VADDR1_FIRST_USABLE_ADDR) {
/* expect cache is in DROM */
cache_page = (c - VADDR0_START_ADDR) / SPI_FLASH_MMU_PAGE_SIZE + DROM0_PAGES_START;
#if CONFIG_SPIRAM_RODATA
if (c >= (uint32_t)&_rodata_reserved_start && c <= (uint32_t)&_rodata_reserved_end) {
offset = rodata_flash2spiram_offset();
}
#endif
} else {
/* expect cache is in IROM */
cache_page = (c - VADDR1_START_ADDR) / SPI_FLASH_MMU_PAGE_SIZE + IROM0_PAGES_START;
#if CONFIG_SPIRAM_FETCH_INSTRUCTIONS
if (c >= (uint32_t)&_instruction_reserved_start && c <= (uint32_t)&_instruction_reserved_end) {
offset = instruction_flash2spiram_offset();
}
#endif
}
if (cache_page >= PAGES_LIMIT) {
/* cached address was not in IROM or DROM */
return SPI_FLASH_CACHE2PHYS_FAIL;
}
uint32_t phys_page = spi_flash_protected_read_mmu_entry(cache_page);
if (phys_page == INVALID_ENTRY_VAL) {
/* page is not mapped */
return SPI_FLASH_CACHE2PHYS_FAIL;
}
uint32_t phys_offs = ((phys_page & MMU_ADDR_MASK) + offset) * SPI_FLASH_MMU_PAGE_SIZE;
return phys_offs | (c & (SPI_FLASH_MMU_PAGE_SIZE-1));
}
const void *IRAM_ATTR spi_flash_phys2cache(uint32_t phys_offs, spi_flash_mmap_memory_t memory)
{
uint32_t phys_page = phys_offs / SPI_FLASH_MMU_PAGE_SIZE;
int start, end, page_delta;
intptr_t base;
if (memory == SPI_FLASH_MMAP_DATA) {
start = DROM0_PAGES_START;
end = DROM0_PAGES_END;
base = VADDR0_START_ADDR;
page_delta = DROM0_PAGES_START > IROM0_PAGES_START ? DROM0_PAGES_START : 0;
} else {
start = PRO_IRAM0_FIRST_USABLE_PAGE;
end = IROM0_PAGES_END;
base = VADDR1_START_ADDR;
page_delta = DROM0_PAGES_START > IROM0_PAGES_START ? 0: IROM0_PAGES_START;
}
spi_flash_disable_interrupts_caches_and_other_cpu();
DPORT_INTERRUPT_DISABLE();
for (int i = start; i < end; i++) {
uint32_t mmu_value = DPORT_SEQUENCE_REG_READ((uint32_t)&DPORT_PRO_FLASH_MMU_TABLE[i]);
#if CONFIG_SPIRAM_FETCH_INSTRUCTIONS
if (phys_page >= instruction_flash_start_page_get() && phys_page <= instruction_flash_end_page_get()) {
if (mmu_value & MMU_ACCESS_SPIRAM) {
mmu_value += instruction_flash2spiram_offset();
mmu_value = (mmu_value & MMU_ADDR_MASK) | MMU_ACCESS_FLASH;
}
}
#endif
#if CONFIG_SPIRAM_RODATA
if (phys_page >= rodata_flash_start_page_get() && phys_page <= rodata_flash_start_page_get()) {
if (mmu_value & MMU_ACCESS_SPIRAM) {
mmu_value += rodata_flash2spiram_offset();
mmu_value = (mmu_value & MMU_ADDR_MASK) | MMU_ACCESS_FLASH;
}
}
#endif
if (mmu_value == PAGE_IN_FLASH(phys_page)) {
i -= page_delta;
intptr_t cache_page = base + (SPI_FLASH_MMU_PAGE_SIZE * i);
DPORT_INTERRUPT_RESTORE();
spi_flash_enable_interrupts_caches_and_other_cpu();
return (const void *) (cache_page | (phys_offs & (SPI_FLASH_MMU_PAGE_SIZE-1)));
}
}
DPORT_INTERRUPT_RESTORE();
spi_flash_enable_interrupts_caches_and_other_cpu();
return NULL;
}
static bool IRAM_ATTR is_page_mapped_in_cache(uint32_t phys_page, const void **out_ptr)
{
int start[2], end[2];
*out_ptr = NULL;
/* SPI_FLASH_MMAP_DATA */
start[0] = DROM0_PAGES_START;
end[0] = DROM0_PAGES_END;
/* SPI_FLASH_MMAP_INST */
start[1] = PRO_IRAM0_FIRST_USABLE_PAGE;
end[1] = IROM0_PAGES_END;
DPORT_INTERRUPT_DISABLE();
for (int j = 0; j < 2; j++) {
for (int i = start[j]; i < end[j]; i++) {
if (DPORT_SEQUENCE_REG_READ((uint32_t)&DPORT_PRO_FLASH_MMU_TABLE[i]) == PAGE_IN_FLASH(phys_page)) {
#if CONFIG_IDF_TARGET_ESP32S2
if (j == 0) { /* SPI_FLASH_MMAP_DATA */
*out_ptr = (const void *)(VADDR0_START_ADDR + SPI_FLASH_MMU_PAGE_SIZE * (i - start[0]));
} else { /* SPI_FLASH_MMAP_INST */
*out_ptr = (const void *)(VADDR1_FIRST_USABLE_ADDR + SPI_FLASH_MMU_PAGE_SIZE * (i - start[1]));
}
#endif
DPORT_INTERRUPT_RESTORE();
return true;
}
}
}
DPORT_INTERRUPT_RESTORE();
return false;
}
/* Validates if given flash address has corresponding cache mapping, if yes, flushes cache memories */
IRAM_ATTR bool spi_flash_check_and_flush_cache(size_t start_addr, size_t length)
{
bool ret = false;
/* align start_addr & length to full MMU pages */
uint32_t page_start_addr = start_addr & ~(SPI_FLASH_MMU_PAGE_SIZE-1);
length += (start_addr - page_start_addr);
length = (length + SPI_FLASH_MMU_PAGE_SIZE - 1) & ~(SPI_FLASH_MMU_PAGE_SIZE-1);
for (uint32_t addr = page_start_addr; addr < page_start_addr + length; addr += SPI_FLASH_MMU_PAGE_SIZE) {
uint32_t page = addr / SPI_FLASH_MMU_PAGE_SIZE;
if (page >= 256) {
return false; /* invalid address */
}
const void *vaddr = NULL;
if (is_page_mapped_in_cache(page, &vaddr)) {
#if CONFIG_IDF_TARGET_ESP32
#if CONFIG_SPIRAM
esp_spiram_writeback_cache();
#endif
Cache_Flush(0);
#ifndef CONFIG_FREERTOS_UNICORE
Cache_Flush(1);
#endif
return true;
#elif CONFIG_IDF_TARGET_ESP32S2
if (vaddr != NULL) {
Cache_Invalidate_Addr((uint32_t)vaddr, SPI_FLASH_MMU_PAGE_SIZE);
ret = true;
}
#endif
}
}
return ret;
}
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