Move MIPS cache management functions to IRAM

Previously these were placed in DRAM, which is overwritten by RoLo
when it loads a new image, but RoLo must call commit_discard_idcache()
after loading the image.

Change-Id: I5dcc4ca711b774166f83c668695edbcabfab2604

1 files changed, 14 insertions, 6 deletions

diff --git a/firmware/target/mips/mmu-mips.h b/firmware/target/mips/mmu-mips.h
index f96ddcc28d..b54807f060 100644
--- a/firmware/target/mips/mmu-mips.h
+++ b/firmware/target/mips/mmu-mips.h
@@ -24,29 +24,37 @@
 
 #include "system-target.h"
 
+/* By default the cache management functions go in .icode so they can be
+ * called safely eg. by the bootloader or RoLo, which need to flush the
+ * cache before jumping to the loaded binary.
+ */
+#ifndef MIPS_CACHEFUNC_ATTR
+# define MIPS_CACHEFUNC_ATTR  __attribute__((section(".icode")))
+#endif
+
 void map_address(unsigned long virtual, unsigned long physical,
                  unsigned long length, unsigned int cache_flags);
 void mmu_init(void);
 
 /* Commits entire DCache */
-void commit_dcache(void);
+void commit_dcache(void) MIPS_CACHEFUNC_ATTR;
 /* Commit and discard entire DCache, will do writeback */
-void commit_discard_dcache(void);
+void commit_discard_dcache(void) MIPS_CACHEFUNC_ATTR;
 
 /* Write DCache back to RAM for the given range and remove cache lines
  * from DCache afterwards */
-void commit_discard_dcache_range(const void *base, unsigned int size);
+void commit_discard_dcache_range(const void *base, unsigned int size) MIPS_CACHEFUNC_ATTR;
 
 /* Write DCache back to RAM for the given range */
-void commit_dcache_range(const void *base, unsigned int size);
+void commit_dcache_range(const void *base, unsigned int size) MIPS_CACHEFUNC_ATTR;
 
 /*
  * Remove cache lines for the given range from DCache
  * will *NOT* do write back except for buffer edges not on a line boundary
  */
-void discard_dcache_range(const void *base, unsigned int size);
+void discard_dcache_range(const void *base, unsigned int size) MIPS_CACHEFUNC_ATTR;
 
 /* Discards the entire ICache, and commit+discards the entire DCache */
-void commit_discard_idcache(void);
+void commit_discard_idcache(void) MIPS_CACHEFUNC_ATTR;
 
 #endif /* __MMU_MIPS_INCLUDE_H */