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fdtdec: optionally add property no-map to created reserved memory node

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Add boolean input argument @no_map to helper function
fdtdec_add_reserved_memory() to add or not "no-map" property
for an added reserved memory node.

Property no-map is used by the Linux kernel to not not map memory
in its static memory mapping. It is needed for example for the|
consistency of system non-cached memory and to prevent speculative
accesses to some firewalled memory.

No functional change. A later change will update to OPTEE library to
add no-map property to OP-TEE reserved memory nodes.

Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Etienne Carriere
2020-09-10 10:49:59 +02:00
committed by Simon Glass
parent 68de0679c9
commit ccaa5747bd
5 changed files with 16 additions and 9 deletions
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5
include/fdtdec.h
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@@ -1029,7 +1029,7 @@ static inline int fdtdec_set_phandle(void *blob, int node, uint32_t phandle)
* };
* uint32_t phandle;
*
* fdtdec_add_reserved_memory(fdt, "framebuffer", &fb, &phandle);
* fdtdec_add_reserved_memory(fdt, "framebuffer", &fb, &phandle, false);
*
* This results in the following subnode being added to the top-level
* /reserved-memory node:
@@ -1056,11 +1056,12 @@ static inline int fdtdec_set_phandle(void *blob, int node, uint32_t phandle)
* @param carveout information about the carveout region
* @param phandlep return location for the phandle of the carveout region
* can be NULL if no phandle should be added
* @param no_map add "no-map" property if true
* @return 0 on success or a negative error code on failure
*/
int fdtdec_add_reserved_memory(void *blob, const char *basename,
const struct fdt_memory *carveout,
uint32_t *phandlep);
uint32_t *phandlep, bool no_map);
/**
* fdtdec_get_carveout() - reads a carveout from an FDT