pussuw commented on code in PR #6069:
URL: https://github.com/apache/incubator-nuttx/pull/6069#discussion_r851733040
##########
arch/risc-v/src/common/riscv_addrenv.c:
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@@ -187,6 +193,38 @@ static int create_spgtables(group_addrenv_t *addrenv)
return i;
}
+/****************************************************************************
+ * Name: copy_kernel_mappings
+ *
+ * Description:
+ * Copy kernel mappings to address environment. Expects that the user page
+ * table does not contain any mappings yet (as they will be wiped).
+ *
+ * Input Parameters:
+ * addrenv - Describes the address environment. The page tables must exist
+ * at this point.
+ *
+ * Returned value:
+ * OK on success, ERROR on failure
+ *
+ ****************************************************************************/
+
+static int copy_kernel_mappings(group_addrenv_t *addrenv)
+{
+ uintptr_t user_mappings = addrenv->spgtables[0];
+
+ /* Copy the L1 references */
+
+ if (user_mappings == 0)
+ {
+ return ERROR;
+ }
+
+ memcpy((void *)user_mappings, (void *)g_kernel_mappings, ENTRIES_PER_PGT);
Review Comment:
Of course, the entire table needs to be copied.
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