diff options
| -rw-r--r-- | arch/arm/include/asm/archrandom.h | 20 | ||||
| -rw-r--r-- | arch/arm/mach-msm/early_random.c | 83 |
2 files changed, 103 insertions, 0 deletions
diff --git a/arch/arm/include/asm/archrandom.h b/arch/arm/include/asm/archrandom.h new file mode 100644 index 000000000000..5530d450a098 --- /dev/null +++ b/arch/arm/include/asm/archrandom.h @@ -0,0 +1,20 @@ +/* Copyright (c) 2013, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#ifndef ARM_ASM_ARCHRANDOM_H +#define ARM_ASM_ARCHRANDOM_H + +extern int arch_get_random_long(unsigned long *v); +extern int arch_get_random_int(unsigned int *v); + +#endif diff --git a/arch/arm/mach-msm/early_random.c b/arch/arm/mach-msm/early_random.c new file mode 100644 index 000000000000..e315b86a4315 --- /dev/null +++ b/arch/arm/mach-msm/early_random.c @@ -0,0 +1,83 @@ +/* Copyright (c) 2013, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/kernel.h> + +#include <mach/scm.h> + +#include <asm/io.h> +#include <asm/cacheflush.h> + +#define TZ_SVC_CRYPTO 10 +#define PRNG_CMD_ID 0x01 + +static int use_arch_random = 1; +struct tz_prng_data { + uint8_t *out_buf; + uint32_t out_buf_sz; +} __packed; + +DEFINE_SCM_BUFFER(common_scm_buf) +DEFINE_MUTEX(arch_random_lock); +#define RANDOM_BUFFER_SIZE PAGE_SIZE +char random_buffer[RANDOM_BUFFER_SIZE] __aligned(PAGE_SIZE); + +int arch_get_random_common(void *v, size_t size) +{ + struct tz_prng_data data; + int ret; + u32 resp; + + if (!use_arch_random) + return 0; + + if (size > sizeof(random_buffer)) + return 0; + + mutex_lock(&arch_random_lock); + data.out_buf = (uint8_t *) virt_to_phys(random_buffer); + data.out_buf_sz = size; + + ret = scm_call_noalloc(TZ_SVC_CRYPTO, PRNG_CMD_ID, &data, + sizeof(data), &resp, sizeof(resp), + common_scm_buf, SCM_BUFFER_SIZE(common_scm_buf)); + if (!ret) { + dmac_inv_range(random_buffer, random_buffer + + RANDOM_BUFFER_SIZE); + outer_inv_range( + (unsigned long) virt_to_phys(random_buffer), + (unsigned long) virt_to_phys(random_buffer) + + RANDOM_BUFFER_SIZE); + memcpy(v, random_buffer, size); + } + mutex_unlock(&arch_random_lock); + return !ret; +} + +int arch_get_random_long(unsigned long *v) +{ + return arch_get_random_common(v, sizeof(unsigned long)); +} + +int arch_get_random_int(unsigned int *v) +{ + return arch_get_random_common(v, sizeof(unsigned int)); +} + +int arch_random_init(void) +{ + use_arch_random = 0; + + return 0; +} +module_init(arch_random_init); |