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authorAlex Elder <elder@linaro.org>2014-04-21 16:53:10 -0500
committerMatt Porter <mporter@linaro.org>2014-04-25 08:51:37 -0400
commited24f446ab82e3f39c4a45357186ca76368301e4 (patch)
tree7c9e49408f5a9e9c9cf9d3475632acf531972924 /arch/arm/mach-bcm/bcm_kona_smc.c
parent8b9c550e37ff4e4d0de2890a835f44a7813e3423 (diff)
ARM: bcm: rewrite commentary for bcm_kona_do_smc()
The block of comments in bcm_kona_do_smc() are somewhat confusing. This patch attempts to clarify what's going on. Signed-off-by: Alex Elder <elder@linaro.org> Reviewed-by: Tim Kryger <tim.kryger@linaro.org> Reviewed-by: Markus Mayer <markus.mayer@linaro.org> Reviewed-by: Matt Porter <mporter@linaro.org> Signed-off-by: Matt Porter <mporter@linaro.org>
Diffstat (limited to 'arch/arm/mach-bcm/bcm_kona_smc.c')
-rw-r--r--arch/arm/mach-bcm/bcm_kona_smc.c38
1 files changed, 28 insertions, 10 deletions
diff --git a/arch/arm/mach-bcm/bcm_kona_smc.c b/arch/arm/mach-bcm/bcm_kona_smc.c
index cc81c86f24b5..a55a7ecf146a 100644
--- a/arch/arm/mach-bcm/bcm_kona_smc.c
+++ b/arch/arm/mach-bcm/bcm_kona_smc.c
@@ -77,16 +77,34 @@ int __init bcm_kona_smc_init(void)
}
/*
- * Since interrupts are disabled in the open mode, we must keep
- * interrupts disabled in secure mode by setting R5=0x3. If interrupts
- * are enabled in open mode, we can set R5=0x0 to allow interrupts in
- * secure mode. If we did this, the secure monitor would return back
- * control to the open mode to handle the interrupt prior to completing
- * the secure service. If this happened, R12 would not be
- * SEC_EXIT_NORMAL and we would need to call SMC again after resetting
- * R5 (it gets clobbered by the secure monitor) and setting R4 to
- * SSAPI_RET_FROM_INT_SERV to indicate that we want the secure monitor
- * to finish up the previous uncompleted secure service.
+ * int bcm_kona_do_smc(u32 service_id, u32 buffer_addr)
+ *
+ * Only core 0 can run the secure monitor code. If an "smc" request
+ * is initiated on a different core it must be redirected to core 0
+ * for execution. We rely on the caller to handle this.
+ *
+ * Each "smc" request supplies a service id and the address of a
+ * buffer containing parameters related to the service to be
+ * performed. A flags value defines the behavior of the level 2
+ * cache and interrupt handling while the secure monitor executes.
+ *
+ * Parameters to the "smc" request are passed in r4-r6 as follows:
+ * r4 service id
+ * r5 flags (SEC_ROM_*)
+ * r6 physical address of buffer with other parameters
+ *
+ * Execution of an "smc" request produces two distinct results.
+ *
+ * First, the secure monitor call itself (regardless of the specific
+ * service request) can succeed, or can produce an error. When an
+ * "smc" request completes this value is found in r12; it should
+ * always be SEC_EXIT_NORMAL.
+ *
+ * In addition, the particular service performed produces a result.
+ * The values that should be expected depend on the service. We
+ * therefore return this value to the caller, so it can handle the
+ * request result appropriately. This result value is found in r0
+ * when the "smc" request completes.
*/
static int bcm_kona_do_smc(u32 service_id, u32 buffer_phys)
{