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heap: Prevent alloc from IRAM to call dram_alloc_to_iram() on esp32c6 target

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Since DRAM and IRAM are superposed on esp32c6 it is not necessary to convert a freshly allocated
DRAM addr to its IRAM equivalent when MALLOC_CAP_EXEC is passed to heap_caps_malloc(). Instead,
proceed with a default allocation since the address returned by multi_heap_malloc() already belongs
to the IRAM region.

Applies for esp32c6 and every boards with superposed DRAM and IRAM addresses.
This commit is contained in:
Guillaume Souchere
2023-01-18 11:19:15 +01:00
parent 8db02b36ac
commit a5d6f62e7e
3 changed files with 23 additions and 1 deletions
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4
components/heap/heap_caps.c
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@@ -131,7 +131,9 @@ IRAM_ATTR static void *heap_caps_malloc_base( size_t size, uint32_t caps)
//doesn't cover, see if they're available in other prios.
if ((get_all_caps(heap) & caps) == caps) {
//This heap can satisfy all the requested capabilities. See if we can grab some memory using it.
if ((caps & MALLOC_CAP_EXEC) && esp_ptr_in_diram_dram((void *)heap->start)) {
// If MALLOC_CAP_EXEC is requested but the DRAM and IRAM are on the same addresses (like on esp32c6)
// proceed as for a default allocation.
if ((caps & MALLOC_CAP_EXEC) && !esp_dram_match_iram() && esp_ptr_in_diram_dram((void *)heap->start)) {
//This is special, insofar that what we're going to get back is a DRAM address. If so,
//we need to 'invert' it (lowest address in DRAM == highest address in IRAM and vice-versa) and
//add a pointer to the DRAM equivalent before the address we're going to return.