diff options
Diffstat (limited to 'common/runtime_svc.c')
-rw-r--r-- | common/runtime_svc.c | 101 |
1 files changed, 97 insertions, 4 deletions
diff --git a/common/runtime_svc.c b/common/runtime_svc.c index 1bda151..c059078 100644 --- a/common/runtime_svc.c +++ b/common/runtime_svc.c @@ -39,13 +39,106 @@ #include <bl_common.h> #include <psci.h> #include <runtime_svc.h> +#include <debug.h> /******************************************************************************* - * Perform initialization of runtime services possibly across exception levels - * in the secure address space e.g. psci & interrupt handling. + * The 'rt_svc_descs' array holds the runtime service descriptors exported by + * services by placing them in the 'rt_svc_descs' linker section. + * The 'rt_svc_descs_indices' array holds the index of a descriptor in the + * 'rt_svc_descs' array. When an SMC arrives, the OEN[29:24] bits and the call + * type[31] bit in the function id are combined to get an index into the + * 'rt_svc_descs_indices' array. This gives the index of the descriptor in the + * 'rt_svc_descs' array which contains the SMC handler. ******************************************************************************/ -void runtime_svc_init(unsigned long mpidr) +#define RT_SVC_DESCS_START ((uint64_t) (&__RT_SVC_DESCS_START__)) +#define RT_SVC_DESCS_END ((uint64_t) (&__RT_SVC_DESCS_END__)) +uint8_t rt_svc_descs_indices[MAX_RT_SVCS]; +static rt_svc_desc *rt_svc_descs; + +/******************************************************************************* + * Simple routine to sanity check a runtime service descriptor before using it + ******************************************************************************/ +static int32_t validate_rt_svc_desc(rt_svc_desc *desc) +{ + if (desc == NULL) + return -EINVAL; + + if (desc->start_oen > desc->end_oen) + return -EINVAL; + + if (desc->end_oen >= OEN_LIMIT) + return -EINVAL; + + if (desc->call_type != SMC_TYPE_FAST && desc->call_type != SMC_TYPE_STD) + return -EINVAL; + + /* A runtime service having no init or handle function doesn't make sense */ + if (desc->init == NULL && desc->handle == NULL) + return -EINVAL; + + return 0; +} + +/******************************************************************************* + * This function calls the initialisation routine in the descriptor exported by + * a runtime service. Once a descriptor has been validated, its start & end + * owning entity numbers and the call type are combined to form a unique oen. + * The unique oen is used as an index into the 'rt_svc_descs_indices' array. + * The index of the runtime service descriptor is stored at this index. + ******************************************************************************/ +void runtime_svc_init() { - psci_setup(mpidr); + int32_t rc = 0; + uint32_t index, start_idx, end_idx; + uint64_t rt_svc_descs_num; + + /* If no runtime services are implemented then simply bail out */ + rt_svc_descs_num = RT_SVC_DESCS_END - RT_SVC_DESCS_START; + rt_svc_descs_num /= sizeof(rt_svc_desc); + if (rt_svc_descs_num == 0) + return; + + /* Initialise internal variables to invalid state */ + memset(rt_svc_descs_indices, -1, sizeof(rt_svc_descs_indices)); + + rt_svc_descs = (rt_svc_desc *) RT_SVC_DESCS_START; + for (index = 0; index < rt_svc_descs_num; index++) { + + /* + * An invalid descriptor is an error condition since it is + * difficult to predict the system behaviour in the absence + * of this service. + */ + rc = validate_rt_svc_desc(&rt_svc_descs[index]); + if (rc) { + ERROR("Invalid runtime service descriptor 0x%x (%s)\n", + &rt_svc_descs[index], + rt_svc_descs[index].name); + goto error; + } + + /* + * Fill the indices corresponding to the start and end owning + * entity numbers with the index of the descriptor which will + * handle the SMCs for this owning entity range. + */ + start_idx = get_unique_oen(rt_svc_descs[index].start_oen, + rt_svc_descs[index].call_type); + end_idx = get_unique_oen(rt_svc_descs[index].end_oen, + rt_svc_descs[index].call_type); + for (; start_idx <= end_idx; start_idx++) + rt_svc_descs_indices[start_idx] = index; + + /* Call the initialisation routine for this runtime service */ + rc = rt_svc_descs[index].init(); + if (rc) { + ERROR("Error initializing runtime service %s\n", + rt_svc_descs[index].name); + goto error; + } + } + return; +error: + panic(); } |