1 /* 2 * Copyright (c) 2023, Linaro Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 9 #include <common/fdt_wrappers.h> 10 #include <common/runtime_svc.h> 11 #include <libfdt.h> 12 #include <smccc_helpers.h> 13 14 /* default platform version is 0.0 */ 15 static int platform_version_major; 16 static int platform_version_minor; 17 18 #define SMC_FASTCALL 0x80000000 19 #define SMC64_FUNCTION (SMC_FASTCALL | 0x40000000) 20 #define SIP_FUNCTION (SMC64_FUNCTION | 0x02000000) 21 #define SIP_FUNCTION_ID(n) (SIP_FUNCTION | (n)) 22 23 /* 24 * We do not use SMCCC_ARCH_SOC_ID here because qemu_sbsa is virtual platform 25 * which uses SoC present in QEMU. And they can change on their own while we 26 * need version of whole 'virtual hardware platform'. 27 */ 28 #define SIP_SVC_VERSION SIP_FUNCTION_ID(1) 29 30 #define SIP_SVC_GET_GIC SIP_FUNCTION_ID(100) 31 32 void sbsa_set_gic_bases(const uintptr_t gicd_base, const uintptr_t gicr_base); 33 uintptr_t sbsa_get_gicd(void); 34 uintptr_t sbsa_get_gicr(void); 35 36 void read_platform_config_from_dt(void *dtb) 37 { 38 int node; 39 const fdt64_t *data; 40 int err; 41 uintptr_t gicd_base; 42 uintptr_t gicr_base; 43 44 /* 45 * QEMU gives us this DeviceTree node: 46 * 47 * intc { 48 reg = < 0x00 0x40060000 0x00 0x10000 49 0x00 0x40080000 0x00 0x4000000>; 50 }; 51 */ 52 node = fdt_path_offset(dtb, "/intc"); 53 if (node < 0) { 54 return; 55 } 56 57 data = fdt_getprop(dtb, node, "reg", NULL); 58 if (data == NULL) { 59 return; 60 } 61 62 err = fdt_get_reg_props_by_index(dtb, node, 0, &gicd_base, NULL); 63 if (err < 0) { 64 ERROR("Failed to read GICD reg property of GIC node\n"); 65 return; 66 } 67 INFO("GICD base = 0x%lx\n", gicd_base); 68 69 err = fdt_get_reg_props_by_index(dtb, node, 1, &gicr_base, NULL); 70 if (err < 0) { 71 ERROR("Failed to read GICR reg property of GIC node\n"); 72 return; 73 } 74 INFO("GICR base = 0x%lx\n", gicr_base); 75 76 sbsa_set_gic_bases(gicd_base, gicr_base); 77 } 78 79 void read_platform_version(void *dtb) 80 { 81 int node; 82 83 node = fdt_path_offset(dtb, "/"); 84 if (node >= 0) { 85 platform_version_major = fdt32_ld(fdt_getprop(dtb, node, 86 "machine-version-major", NULL)); 87 platform_version_minor = fdt32_ld(fdt_getprop(dtb, node, 88 "machine-version-minor", NULL)); 89 } 90 } 91 92 void sip_svc_init(void) 93 { 94 /* Read DeviceTree data before MMU is enabled */ 95 96 void *dtb = (void *)(uintptr_t)ARM_PRELOADED_DTB_BASE; 97 int err; 98 99 err = fdt_open_into(dtb, dtb, PLAT_QEMU_DT_MAX_SIZE); 100 if (err < 0) { 101 ERROR("Invalid Device Tree at %p: error %d\n", dtb, err); 102 return; 103 } 104 105 err = fdt_check_header(dtb); 106 if (err < 0) { 107 ERROR("Invalid DTB file passed\n"); 108 return; 109 } 110 111 read_platform_version(dtb); 112 INFO("Platform version: %d.%d\n", platform_version_major, platform_version_minor); 113 114 read_platform_config_from_dt(dtb); 115 } 116 117 /* 118 * This function is responsible for handling all SiP calls from the NS world 119 */ 120 uintptr_t sbsa_sip_smc_handler(uint32_t smc_fid, 121 u_register_t x1, 122 u_register_t x2, 123 u_register_t x3, 124 u_register_t x4, 125 void *cookie, 126 void *handle, 127 u_register_t flags) 128 { 129 uint32_t ns; 130 131 /* Determine which security state this SMC originated from */ 132 ns = is_caller_non_secure(flags); 133 if (!ns) { 134 ERROR("%s: wrong world SMC (0x%x)\n", __func__, smc_fid); 135 SMC_RET1(handle, SMC_UNK); 136 } 137 138 switch (smc_fid) { 139 case SIP_SVC_VERSION: 140 INFO("Platform version requested\n"); 141 SMC_RET3(handle, NULL, platform_version_major, platform_version_minor); 142 143 case SIP_SVC_GET_GIC: 144 SMC_RET3(handle, NULL, sbsa_get_gicd(), sbsa_get_gicr()); 145 146 default: 147 ERROR("%s: unhandled SMC (0x%x) (function id: %d)\n", __func__, smc_fid, 148 smc_fid - SIP_FUNCTION); 149 SMC_RET1(handle, SMC_UNK); 150 } 151 } 152 153 int sbsa_sip_smc_setup(void) 154 { 155 return 0; 156 } 157 158 /* Define a runtime service descriptor for fast SMC calls */ 159 DECLARE_RT_SVC( 160 sbsa_sip_svc, 161 OEN_SIP_START, 162 OEN_SIP_END, 163 SMC_TYPE_FAST, 164 sbsa_sip_smc_setup, 165 sbsa_sip_smc_handler 166 ); 167