[PATCH v4 01/13] mmu: explicitly map executable non-SDRAM regions with MAP_CODE

[Ahmad Fatoum]

So far we have been setting eXecute Never on MAP_UNCACHED regions and
left it out for the default MAP_CACHED region.

We have at least three places, which depend on this to remap non-SDRAM
regions executable, so ROM code or newly uploaded code can be run.

Switch them over to use a new MAP_CODE mapping type. For now, this is
equivalent to MAP_CACHED, but with the addition of W^X support in
barebox, this will be required to avoid a prefetch abort when MMU
attributes are used.

Signed-off-by: Ahmad Fatoum <a.fat...@barebox.org>
Signed-off-by: Sascha Hauer <s.ha...@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fat...@barebox.org>
---
 arch/arm/mach-imx/romapi.c | 3 ++-
 drivers/firmware/socfpga.c | 4 ++++
 drivers/hab/habv4.c        | 2 +-
 include/mmu.h              | 1 +
 4 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-imx/romapi.c b/arch/arm/mach-imx/romapi.c
index 10af42f28a76..a4143d372ae8 100644
--- a/arch/arm/mach-imx/romapi.c
+++ b/arch/arm/mach-imx/romapi.c
@@ -299,7 +299,8 @@ void imx93_bootsource(void)
                goto out;
        }
 
-       arch_remap_range((void *)rom.start, rom.start, resource_size(&rom), 
MAP_CACHED);
+       /* TODO: restore uncached mapping once we no longer need this? */
+       arch_remap_range((void *)rom.start, rom.start, resource_size(&rom), 
MAP_CODE);
 
        OPTIMIZER_HIDE_VAR(rom_api);
 
diff --git a/drivers/firmware/socfpga.c b/drivers/firmware/socfpga.c
index 0f7d11abb588..13ddbe32c30c 100644
--- a/drivers/firmware/socfpga.c
+++ b/drivers/firmware/socfpga.c
@@ -361,11 +361,15 @@ static int socfpga_fpgamgr_program_finish(struct 
firmware_handler *fh)
                           &socfpga_sdram_apply_static_cfg,
                           socfpga_sdram_apply_static_cfg_sz);
 
+       remap_range((void *)CYCLONE5_OCRAM_ADDRESS, PAGE_SIZE, MAP_CODE);
+
        sync_caches_for_execution();
 
        ocram_func((void __iomem *) (CYCLONE5_SDR_ADDRESS +
                                     SDR_CTRLGRP_STATICCFG_ADDRESS));
 
+       remap_range((void *)CYCLONE5_OCRAM_ADDRESS, PAGE_SIZE, MAP_UNCACHED);
+
        return 0;
 }
 
diff --git a/drivers/hab/habv4.c b/drivers/hab/habv4.c
index 4945e8930acb..83ee06a6aa46 100644
--- a/drivers/hab/habv4.c
+++ b/drivers/hab/habv4.c
@@ -689,7 +689,7 @@ int imx8m_hab_print_status(void)
 
 int imx6_hab_print_status(void)
 {
-       remap_range(0x0, SZ_1M, MAP_CACHED);
+       remap_range(0x0, SZ_1M, MAP_CODE);
 
        imx6_hab_get_status();
 
diff --git a/include/mmu.h b/include/mmu.h
index 84ec6c5efb3e..669959050194 100644
--- a/include/mmu.h
+++ b/include/mmu.h
@@ -8,6 +8,7 @@
 #define MAP_UNCACHED   0
 #define MAP_CACHED     1
 #define MAP_FAULT      2
+#define MAP_CODE       MAP_CACHED      /* until support added */
 
 /*
  * Depending on the architecture the default mapping can be
-- 
2.39.5