mirror of
https://github.com/Atmosphere-NX/Atmosphere
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74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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 __REGS_H__
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#define __REGS_H__
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/**
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* Access to system registers.
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*/
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#define WRITE_SYSREG(sysreg, val, type) \
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asm volatile ("msr "#sysreg", %0\n" : : "r"((type)(val)))
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#define READ_SYSREG(sysreg, val, type) \
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asm volatile ("mrs %0, "#sysreg"\n" : "=r"((type)(val)))
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#define READ_SYSREG_32(sysreg, val) READ_SYSREG(sysreg, val, uint32_t)
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#define WRITE_SYSREG_32(sysreg, val) WRITE_SYSREG(sysreg, val, uint32_t)
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#define READ_SYSREG_64(sysreg, val) READ_SYSREG(sysreg, val, uint64_t)
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#define WRITE_SYSREG_64(sysreg, val) WRITE_SYSREG(sysreg, val, uint64_t)
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/**
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* Returns the system's current Execution Level (EL).
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*/
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inline static uint32_t get_current_el(void) {
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uint32_t val;
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// Read the CurrentEl register, and extract the bits that tell us our EL.
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READ_SYSREG_32(CurrentEl, val);
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return val >> 2;
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}
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/**
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* Sets the base address of the EL2 exception table.
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*/
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inline static void set_vbar_el2(void * address) {
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WRITE_SYSREG_64(vbar_el2, (uint64_t)address);
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}
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/**
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* Sets the address to 'return to' when leaving EL2.
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*/
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inline static void set_elr_el2(void * address) {
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WRITE_SYSREG_64(elr_el2, (uint64_t)address);
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}
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/**
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* Returns the MMU status bit from the SCTLR register.
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*/
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inline static uint32_t get_el2_mmu_status(void) {
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uint32_t val;
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// Read the CurrentEl register, and extract the bits that tell us our EL.
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READ_SYSREG_32(sctlr_el2, val);
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return val & 1;
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}
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#endif
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