diff options
Diffstat (limited to 'include/runtime_svc.h')
| -rw-r--r-- | include/runtime_svc.h | 156 |
1 files changed, 151 insertions, 5 deletions
diff --git a/include/runtime_svc.h b/include/runtime_svc.h index e5bfcf3..db8fd29 100644 --- a/include/runtime_svc.h +++ b/include/runtime_svc.h @@ -38,20 +38,47 @@ ******************************************************************************/ #define FUNCID_TYPE_SHIFT 31 #define FUNCID_CC_SHIFT 30 -#define FUNCID_OWNER_SHIFT 24 +#define FUNCID_OEN_SHIFT 24 #define FUNCID_NUM_SHIFT 0 #define FUNCID_TYPE_MASK 0x1 #define FUNCID_CC_MASK 0x1 -#define FUNCID_OWNER_MASK 0x3f +#define FUNCID_OEN_MASK 0x3f #define FUNCID_NUM_MASK 0xffff +#define FUNCID_TYPE_WIDTH 1 +#define FUNCID_CC_WIDTH 1 +#define FUNCID_OEN_WIDTH 6 +#define FUNCID_NUM_WIDTH 16 + #define GET_SMC_CC(id) ((id >> FUNCID_CC_SHIFT) & \ FUNCID_CC_MASK) #define SMC_64 1 #define SMC_32 0 #define SMC_UNK 0xffffffff +#define SMC_TYPE_FAST 1 +#define SMC_TYPE_STD 0 + +/******************************************************************************* + * Owning entity number definitions inside the function id as per the SMC + * calling convention + ******************************************************************************/ +#define OEN_ARM_START 0 +#define OEN_ARM_END 0 +#define OEN_CPU_START 1 +#define OEN_CPU_END 1 +#define OEN_SIP_START 2 +#define OEN_SIP_END 2 +#define OEN_OEM_START 3 +#define OEN_OEM_END 3 +#define OEN_STD_START 4 /* Standard Calls */ +#define OEN_STD_END 4 +#define OEN_TAP_START 48 /* Trusted Applications */ +#define OEN_TAP_END 49 +#define OEN_TOS_START 50 /* Trusted OS */ +#define OEN_TOS_END 63 +#define OEN_LIMIT 64 /******************************************************************************* * Constants to indicate type of exception to the common exception handler. @@ -112,8 +139,77 @@ #define GPREGS_FP_OFF 0x100 #define GPREGS_LR_OFF 0x108 +/* + * Constants to allow the assembler access a runtime service + * descriptor + */ +#define SIZEOF_RT_SVC_DESC 32 +#define RT_SVC_DESC_INIT 16 +#define RT_SVC_DESC_HANDLE 24 + +/* + * The function identifier has 6 bits for the owning entity number and + * single bit for the type of smc call. When taken together these + * values limit the maximum number of runtime services to 128. + */ +#define MAX_RT_SVCS 128 + #ifndef __ASSEMBLY__ +/* Prototype for runtime service initializing function */ +typedef int32_t (*rt_svc_init)(void); + +/* Convenience macros to return from SMC handler */ +#define SMC_RET1(_h, _x0) { \ + write_ctx_reg(get_gpregs_ctx(_h), CTX_GPREG_X0, (_x0)); \ + return _x0; \ +} +#define SMC_RET2(_h, _x0, _x1) { \ + write_ctx_reg(get_gpregs_ctx(_h), CTX_GPREG_X1, (_x1)); \ + SMC_RET1(_h, (_x0)); \ +} +#define SMC_RET3(_h, _x0, _x1, _x2) { \ + write_ctx_reg(get_gpregs_ctx(_h), CTX_GPREG_X2, (_x2)); \ + SMC_RET2(_h, (_x0), (_x1)); \ +} +#define SMC_RET4(_h, _x0, _x1, _x2, _x3) { \ + write_ctx_reg(get_gpregs_ctx(_h), CTX_GPREG_X3, (_x3)); \ + SMC_RET3(_h, (_x0), (_x1), (_x2)); \ +} + + +/* + * Convenience macros to access general purpose registers using handle provided + * to SMC handler. These takes the offset values defined in context.h + */ +#define SMC_GET_GP(_h, _g) \ + read_ctx_reg(get_gpregs_ctx(_h), (_g)); +#define SMC_SET_GP(_h, _g, _v) \ + write_ctx_reg(get_gpregs_ctx(_h), (_g), (_v)); + +/* + * Convenience macros to access EL3 context registers using handle provided to + * SMC handler. These takes the offset values defined in context.h + */ +#define SMC_GET_EL3(_h, _e) \ + read_ctx_reg(get_el3state_ctx(_h), (_e)); +#define SMC_SET_EL3(_h, _e, _v) \ + write_ctx_reg(get_el3state_ctx(_h), (_e), (_v)); + +/* + * Prototype for runtime service SMC handler function. x0 (SMC Function ID) to + * x4 are as passed by the caller. Rest of the arguments to SMC and the context + * can be accessed using the handle pointer. The cookie parameter is reserved + * for future use + */ +typedef uint64_t (*rt_svc_handle)(uint32_t smc_fid, + uint64_t x1, + uint64_t x2, + uint64_t x3, + uint64_t x4, + void *cookie, + void *handle, + uint64_t flags); typedef struct { uint64_t x0; uint64_t x1; @@ -150,9 +246,31 @@ typedef struct { * Alignment constraint which allows save & restore of fp & lr on the * stack during exception handling */ - uint64_t fp __attribute__((__aligned__(16))); + uint64_t fp __aligned(16); uint64_t lr; -} __attribute__((__aligned__(16))) gp_regs; +} __aligned(16) gp_regs; + +typedef struct { + uint8_t start_oen; + uint8_t end_oen; + uint8_t call_type; + const char *name; + rt_svc_init init; + rt_svc_handle handle; +} rt_svc_desc; + +/* + * Convenience macro to declare a service descriptor + */ +#define DECLARE_RT_SVC(_name, _start, _end, _type, _setup, _smch) \ + static const rt_svc_desc __svc_desc_ ## _name \ + __attribute__ ((section("rt_svc_descs"), used)) = { \ + _start, \ + _end, \ + _type, \ + #_name, \ + _setup, \ + _smch } /******************************************************************************* * Compile time assertions to ensure that: @@ -164,11 +282,39 @@ typedef struct { CASSERT((sizeof(gp_regs) == SIZEOF_GPREGS), assert_sizeof_gpregs_mismatch); CASSERT(GPREGS_FP_OFF == __builtin_offsetof(gp_regs, fp), \ assert_gpregs_fp_offset_mismatch); +/* + * Compile time assertions related to the 'rt_svc_desc' structure to: + * 1. ensure that the assembler and the compiler view of the size + * of the structure are the same. + * 2. ensure that the assembler and the compiler see the initialisation + * routine at the same offset. + * 2. ensure that the assembler and the compiler see the handler + * routine at the same offset. + */ +CASSERT((sizeof(rt_svc_desc) == SIZEOF_RT_SVC_DESC), \ + assert_sizeof_rt_svc_desc_mismatch); +CASSERT(RT_SVC_DESC_INIT == __builtin_offsetof(rt_svc_desc, init), \ + assert_rt_svc_desc_init_offset_mismatch); +CASSERT(RT_SVC_DESC_HANDLE == __builtin_offsetof(rt_svc_desc, handle), \ + assert_rt_svc_desc_handle_offset_mismatch); + + +/* + * This macro combines the call type and the owning entity number corresponding + * to a runtime service to generate a unique owning entity number. This unique + * oen is used to access an entry in the 'rt_svc_descs_indices' array. The entry + * contains the index of the service descriptor in the 'rt_svc_descs' array. + */ +#define get_unique_oen(oen, call_type) ((oen & FUNCID_OEN_MASK) | \ + ((call_type & FUNCID_TYPE_MASK) \ + << FUNCID_OEN_WIDTH)) /******************************************************************************* * Function & variable prototypes ******************************************************************************/ -extern void runtime_svc_init(unsigned long mpidr); +extern void runtime_svc_init(); +extern uint64_t __RT_SVC_DESCS_START__; +extern uint64_t __RT_SVC_DESCS_END__; #endif /*__ASSEMBLY__*/ #endif /* __RUNTIME_SVC_H__ */ |