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https://github.com/trezor/trezor-firmware.git
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84 lines
3.0 KiB
C
84 lines
3.0 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TREZORHAL_MPU_H
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#define TREZORHAL_MPU_H
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#include <trezor_types.h>
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#ifdef KERNEL_MODE
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// The MPU driver can be set to on of the following modes.
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//
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// In each mode, the MPU is configured to allow access to specific
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// memory regions.
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//
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// The `MPU_MODE_DEFAULT` mode is the most restrictive and serves as
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// a base for other modes.
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typedef enum {
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MPU_MODE_DISABLED, // MPU is disabled
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MPU_MODE_DEFAULT, // Default
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MPU_MODE_BOARDCAPS, // + boardloader capabilities (privileged RO)
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MPU_MODE_BOOTUPDATE, // + bootloader area (privileged RW)
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MPU_MODE_OTP, // + OTP (privileged RW)
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MPU_MODE_FSMC_REGS, // + FSMC control registers (privileged RW)
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MPU_MODE_FLASHOB, // + Option bytes mapping (privileged RW)
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MPU_MODE_SECRET, // + secret area (privileged RW)
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MPU_MODE_STORAGE, // + both storage areas (privileged RW)
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MPU_MODE_ASSETS, // + assets (privileged RW)
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MPU_MODE_SAES, // + unprivileged SAES code
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MPU_MODE_KERNEL_SRAM, // + extra kernel SRAM (STM32F4 Only) (privileged RW)
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MPU_MODE_UNUSED_FLASH, // + unused flash areas (privileged RW)
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MPU_MODE_APP, // + unprivileged DMA2D (RW) & Assets (RO)
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} mpu_mode_t;
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// Initializes the MPU and sets it to MPU_MODE_DISABLED.
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//
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// This function should be called before any other MPU function.
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void mpu_init(void);
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// Returns the current MPU mode.
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//
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// If the MPU is not initialized, returns MPU_MODE_DISABLED.
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mpu_mode_t mpu_get_mode(void);
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// Reconfigures the MPU to the given mode and returns the previous mode.
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//
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// If the MPU is not initialized, does nothing and returns MPU_MODE_DISABLED.
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mpu_mode_t mpu_reconfig(mpu_mode_t mode);
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// Restores the MPU to the given mode.
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//
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// Same as `mpu_reconfig()`, but with a more descriptive name.
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void mpu_restore(mpu_mode_t mode);
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// Sets the MPU to allow unprivileged access to the
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// framebuffer at the given address and size.
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//
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// The changes are made effective after the next MPU reconfiguration
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// to the `MPU_MODE_APP` mode.
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//
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// Addr and size must be aligned to the 32-byte boundary.
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// If addr == 0, the framebuffer is not accessible in the unprivileged mode.
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void mpu_set_unpriv_fb(void* addr, size_t size);
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#endif // KERNEL_MODE
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#endif // TREZORHAL_MPU_H
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