diff options
author | Ian Campbell <ijc@hellion.org.uk> | 2015-04-21 08:18:36 +0300 |
---|---|---|
committer | Tom Warren <twarren@nvidia.com> | 2015-05-13 19:24:15 +0300 |
commit | 73169874a2867cb8ee5ec79eb9f2b176d3af34b2 (patch) | |
tree | c54e48fe526faa9ef81f58de7460013646706d5b /arch/arm/cpu/armv7/virt-v7.c | |
parent | ffdf9f9ae057131375534df5f1e798d1e64785e9 (diff) | |
download | u-boot-73169874a2867cb8ee5ec79eb9f2b176d3af34b2.tar.xz |
tegra124: Reserve secure RAM using MC_SECURITY_CFG{0, 1}_0
These registers can be used to prevent non-secure world from accessing a
megabyte aligned region of RAM, use them to protect the u-boot secure monitor
code.
At first I tried to do this from s_init(), however this inexplicably causes
u-boot's networking (e.g. DHCP) to fail, while networking under Linux was fine.
So instead I have added a new weak arch function protect_secure_section()
called from relocate_secure_section() and reserved the region there. This is
better overall since it defers the reservation until after the sec vs. non-sec
decision (which can be influenced by an envvar) has been made when booting the
os.
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
[Jan: tiny style adjustment]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/cpu/armv7/virt-v7.c')
-rw-r--r-- | arch/arm/cpu/armv7/virt-v7.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/virt-v7.c b/arch/arm/cpu/armv7/virt-v7.c index db4f6ad679..9c533060b8 100644 --- a/arch/arm/cpu/armv7/virt-v7.c +++ b/arch/arm/cpu/armv7/virt-v7.c @@ -46,6 +46,10 @@ static unsigned long get_gicd_base_address(void) #endif } +/* Define a specific version of this function to enable any available + * hardware protections for the reserved region */ +void __weak protect_secure_section(void) {} + static void relocate_secure_section(void) { #ifdef CONFIG_ARMV7_SECURE_BASE @@ -54,6 +58,7 @@ static void relocate_secure_section(void) memcpy((void *)CONFIG_ARMV7_SECURE_BASE, __secure_start, sz); flush_dcache_range(CONFIG_ARMV7_SECURE_BASE, CONFIG_ARMV7_SECURE_BASE + sz + 1); + protect_secure_section(); invalidate_icache_all(); #endif } |