diff options
| author | Ian Campbell | 2015-04-21 07:18:36 +0200 |
|---|---|---|
| committer | Tom Warren | 2015-05-13 09:24:15 -0700 |
| commit | 73169874a2867cb8ee5ec79eb9f2b176d3af34b2 (patch) | |
| tree | c54e48fe526faa9ef81f58de7460013646706d5b /arch/arm/mach-tegra | |
| parent | ffdf9f9ae057131375534df5f1e798d1e64785e9 (diff) | |
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/mach-tegra')
| -rw-r--r-- | arch/arm/mach-tegra/ap.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/ap.c b/arch/arm/mach-tegra/ap.c index a17dfd1e225..869a2ed6bc3 100644 --- a/arch/arm/mach-tegra/ap.c +++ b/arch/arm/mach-tegra/ap.c @@ -10,6 +10,7 @@ #include <common.h> #include <asm/io.h> #include <asm/arch/gp_padctrl.h> +#include <asm/arch/mc.h> #include <asm/arch-tegra/ap.h> #include <asm/arch-tegra/clock.h> #include <asm/arch-tegra/fuse.h> @@ -154,6 +155,20 @@ static void init_pmc_scratch(void) writel(odmdata, &pmc->pmc_scratch20); } +#ifdef CONFIG_ARMV7_SECURE_RESERVE_SIZE +void protect_secure_section(void) +{ + struct mc_ctlr *mc = (struct mc_ctlr *)NV_PA_MC_BASE; + + /* Must be MB aligned */ + BUILD_BUG_ON(CONFIG_ARMV7_SECURE_BASE & 0xFFFFF); + BUILD_BUG_ON(CONFIG_ARMV7_SECURE_RESERVE_SIZE & 0xFFFFF); + + writel(CONFIG_ARMV7_SECURE_BASE, &mc->mc_security_cfg0); + writel(CONFIG_ARMV7_SECURE_RESERVE_SIZE >> 20, &mc->mc_security_cfg1); +} +#endif + void s_init(void) { /* Init PMC scratch memory */ |