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kernel: app_smem: allowing pinning memory partitions

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This allows memory partitions to be put into the pinned
section so they are available during boot. For example,
the stack guard (in libc partition) is needed during boot
but before the paging mechanism is initialized. Without
pinning it in physical memory, it would fault in early
boot process.

A new cmake property app_smem,pinned_partitions is
introduced so that additional partitions can be pinned
if needed.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2021-07-12 13:33:32 -07:00 • committed by Christopher Friedt
commit 2117a2a44b
10 changed files with 216 additions and 26 deletions
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7
include/linker/linker-defs.h
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@ -197,6 +197,13 @@ extern char _app_smem_size[];
extern char _app_smem_rom_start[];
extern char _app_smem_num_words[];
#ifdef CONFIG_LINKER_USE_PINNED_SECTION
extern char _app_smem_pinned_start[];
extern char _app_smem_pinned_end[];
extern char _app_smem_pinned_size[];
extern char _app_smem_pinned_num_words[];
#endif
/* Memory owned by the kernel. Start and end will be aligned for memory
* management/protection hardware for the target architecture.
*