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paddr: add comments to mmap in init_mem #162

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Sep 6, 2023
Merged

paddr: add comments to mmap in init_mem #162

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4 changes: 4 additions & 0 deletions src/memory/paddr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,10 @@ void init_mem() {
#ifdef CONFIG_MULTICORE_DIFF
panic("Pmem must not use mmap during multi-core difftest");
#endif
// Note: we are using MAP_FIXED here, in the SHARED mode, even if
// init_mem may be called multiple times, the memory space will be
// allocated only once at the first time called.
// See https://man7.org/linux/man-pages/man2/mmap.2.html for details.
void *ret = mmap((void *)pmem, MEMORY_SIZE, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
if (ret != pmem) {
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