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| 1 | +/* ftpm_callable.c |
| 2 | + * |
| 3 | + * Copyright (C) 2026 wolfSSL Inc. |
| 4 | + * |
| 5 | + * This file is part of wolfBoot. |
| 6 | + */ |
| 7 | + |
| 8 | +#ifdef WOLFBOOT_TZ_FTPM |
| 9 | + |
| 10 | +#include <stdint.h> |
| 11 | +#include <string.h> |
| 12 | + |
| 13 | +#include "store_sbrk.h" |
| 14 | +#include "wolfboot/wcs_ftpm.h" |
| 15 | +#include "wolftpm/fwtpm/fwtpm.h" |
| 16 | +#include "wolftpm/fwtpm/fwtpm_command.h" |
| 17 | +#include "wolftpm/fwtpm/fwtpm_nv.h" |
| 18 | +#include "wolftpm/tpm2_types.h" |
| 19 | + |
| 20 | +static FWTPM_CTX ftpm_ctx; |
| 21 | +static int ftpm_ready; |
| 22 | + |
| 23 | +extern unsigned int _start_heap; |
| 24 | +extern unsigned int _heap_size; |
| 25 | + |
| 26 | +void *_sbrk(unsigned int incr) |
| 27 | +{ |
| 28 | + static uint8_t *heap; |
| 29 | + return wolfboot_store_sbrk(incr, &heap, (uint8_t *)&_start_heap, |
| 30 | + (uint32_t)(&_heap_size)); |
| 31 | +} |
| 32 | + |
| 33 | +#ifndef FWTPM_NO_NV |
| 34 | +#define WCS_FTPM_NV_SIZE (16U * 1024U) |
| 35 | +static uint8_t ftpm_nv[WCS_FTPM_NV_SIZE]; |
| 36 | + |
| 37 | +static int ftpm_nv_read(void *ctx, word32 offset, byte *buf, word32 size) |
| 38 | +{ |
| 39 | + uint8_t *nv = (uint8_t *)ctx; |
| 40 | + |
| 41 | + if (nv == NULL || buf == NULL || offset > WCS_FTPM_NV_SIZE || |
| 42 | + size > (WCS_FTPM_NV_SIZE - offset)) { |
| 43 | + return BAD_FUNC_ARG; |
| 44 | + } |
| 45 | + |
| 46 | + XMEMCPY(buf, nv + offset, size); |
| 47 | + return TPM_RC_SUCCESS; |
| 48 | +} |
| 49 | + |
| 50 | +static int ftpm_nv_write(void *ctx, word32 offset, const byte *buf, |
| 51 | + word32 size) |
| 52 | +{ |
| 53 | + uint8_t *nv = (uint8_t *)ctx; |
| 54 | + |
| 55 | + if (nv == NULL || buf == NULL || offset > WCS_FTPM_NV_SIZE || |
| 56 | + size > (WCS_FTPM_NV_SIZE - offset)) { |
| 57 | + return BAD_FUNC_ARG; |
| 58 | + } |
| 59 | + |
| 60 | + XMEMCPY(nv + offset, buf, size); |
| 61 | + return TPM_RC_SUCCESS; |
| 62 | +} |
| 63 | + |
| 64 | +static int ftpm_nv_erase(void *ctx, word32 offset, word32 size) |
| 65 | +{ |
| 66 | + uint8_t *nv = (uint8_t *)ctx; |
| 67 | + |
| 68 | + if (nv == NULL || offset > WCS_FTPM_NV_SIZE || |
| 69 | + size > (WCS_FTPM_NV_SIZE - offset)) { |
| 70 | + return BAD_FUNC_ARG; |
| 71 | + } |
| 72 | + |
| 73 | + XMEMSET(nv + offset, 0xFF, size); |
| 74 | + return TPM_RC_SUCCESS; |
| 75 | +} |
| 76 | + |
| 77 | +static FWTPM_NV_HAL ftpm_nv_hal = { |
| 78 | + ftpm_nv_read, |
| 79 | + ftpm_nv_write, |
| 80 | + ftpm_nv_erase, |
| 81 | + ftpm_nv, |
| 82 | + WCS_FTPM_NV_SIZE |
| 83 | +}; |
| 84 | +#endif /* !FWTPM_NO_NV */ |
| 85 | + |
| 86 | +static uint32_t ftpm_rsp_size(const uint8_t *rsp, int rspLen) |
| 87 | +{ |
| 88 | + if (rsp == NULL || rspLen < TPM2_HEADER_SIZE) { |
| 89 | + return 0; |
| 90 | + } |
| 91 | + |
| 92 | + return ((uint32_t)rsp[2] << 24) | |
| 93 | + ((uint32_t)rsp[3] << 16) | |
| 94 | + ((uint32_t)rsp[4] << 8) | |
| 95 | + (uint32_t)rsp[5]; |
| 96 | +} |
| 97 | + |
| 98 | +void wcs_ftpm_init(void) |
| 99 | +{ |
| 100 | + int rc; |
| 101 | + |
| 102 | +#ifndef FWTPM_NO_NV |
| 103 | + XMEMSET(ftpm_nv, 0xFF, sizeof(ftpm_nv)); |
| 104 | +#endif |
| 105 | + XMEMSET(&ftpm_ctx, 0, sizeof(ftpm_ctx)); |
| 106 | +#ifndef FWTPM_NO_NV |
| 107 | + (void)FWTPM_NV_SetHAL(&ftpm_ctx, &ftpm_nv_hal); |
| 108 | +#endif |
| 109 | + |
| 110 | + rc = FWTPM_Init(&ftpm_ctx); |
| 111 | + if (rc == 0) { |
| 112 | + ftpm_ctx.wasStarted = 1; |
| 113 | + ftpm_ready = 1; |
| 114 | + } |
| 115 | +} |
| 116 | + |
| 117 | +int CSME_NSE_API wcs_ftpm_transmit(const uint8_t *cmd, uint32_t cmdSz, |
| 118 | + uint8_t *rsp, uint32_t *rspSz) |
| 119 | +{ |
| 120 | + int rspLen; |
| 121 | + |
| 122 | + if (!ftpm_ready) { |
| 123 | + return TPM_RC_INITIALIZE; |
| 124 | + } |
| 125 | + if (cmd == NULL || rsp == NULL || rspSz == NULL || cmdSz == 0U || |
| 126 | + cmdSz > WCS_FTPM_MAX_COMMAND_SIZE || *rspSz == 0U || |
| 127 | + *rspSz > WCS_FTPM_MAX_COMMAND_SIZE) { |
| 128 | + return BAD_FUNC_ARG; |
| 129 | + } |
| 130 | + |
| 131 | + rspLen = (int)*rspSz; |
| 132 | + int rc = FWTPM_ProcessCommand(&ftpm_ctx, cmd, (int)cmdSz, rsp, &rspLen, 0); |
| 133 | + if (rc >= 0) { |
| 134 | + uint32_t wireSz = ftpm_rsp_size(rsp, rspLen); |
| 135 | + if (wireSz > 0U && wireSz <= *rspSz) { |
| 136 | + *rspSz = wireSz; |
| 137 | + rc = TPM_RC_SUCCESS; |
| 138 | + } |
| 139 | + else if (rspLen >= 0) { |
| 140 | + *rspSz = (uint32_t)rspLen; |
| 141 | + } |
| 142 | + } |
| 143 | + return rc; |
| 144 | +} |
| 145 | + |
| 146 | +#endif /* WOLFBOOT_TZ_FTPM */ |
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