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esp32: IRAM_DATA_ATTR and IRAM_BSS_ATTR introduced

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Using these attributes, .data and .bss can be placed in IRAM

Signed-off-by: Sachin Parekh <sachin.parekh@espressif.com>
This commit is contained in:
Sachin Parekh
2020-04-16 16:02:07 +05:30
parent f245a518be
commit 1e6c25992e
4 changed files with 55 additions and 3 deletions
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9
components/esp32/cpu_start.c
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@@ -98,6 +98,10 @@ extern int _bss_start;
extern int _bss_end;
extern int _rtc_bss_start;
extern int _rtc_bss_end;
#ifdef CONFIG_ESP32_IRAM_AS_8BIT_ACCESSIBLE_MEMORY
extern int _iram_bss_start;
extern int _iram_bss_end;
#endif
#if CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
extern int _ext_ram_bss_start;
extern int _ext_ram_bss_end;
@@ -157,6 +161,11 @@ void IRAM_ATTR call_start_cpu0(void)
//Clear BSS. Please do not attempt to do any complex stuff (like early logging) before this.
memset(&_bss_start, 0, (&_bss_end - &_bss_start) * sizeof(_bss_start));
#ifdef CONFIG_ESP32_IRAM_AS_8BIT_ACCESSIBLE_MEMORY
// Clear IRAM BSS
memset(&_iram_bss_start, 0, (&_iram_bss_end - &_iram_bss_start) * sizeof(_iram_bss_start));
#endif
/* Unless waking from deep sleep (implying RTC memory is intact), clear RTC bss */
if (rst_reas[0] != DEEPSLEEP_RESET) {
memset(&_rtc_bss_start, 0, (&_rtc_bss_end - &_rtc_bss_start) * sizeof(_rtc_bss_start));