/* * This file is part of the coreboot project. * * Copyright 2014 Google Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Reference: ARM Architecture Reference Manual, ARMv8-A edition * pstate.c: This file defines all the library functions for accessing * PSTATE and special purpose registers */ #include <stdint.h> #include <arch/lib_helpers.h> /* CurrentEL */ uint32_t raw_read_current_el(void) { uint32_t current_el; __asm__ __volatile__("mrs %0, CurrentEL\n\t" : "=r" (current_el) : : "memory"); return current_el; } uint32_t get_current_el(void) { uint32_t current_el = raw_read_current_el(); return ((current_el >> CURRENT_EL_SHIFT) & CURRENT_EL_MASK); } /* DAIF */ uint32_t raw_read_daif(void) { uint32_t daif; __asm__ __volatile__("mrs %0, DAIF\n\t" : "=r" (daif) : : "memory"); return daif; } void raw_write_daif(uint32_t daif) { __asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory"); } void enable_debug_exceptions(void) { __asm__ __volatile__("msr DAIFClr, %0\n\t" : : "i" (DAIF_DBG_BIT) : "memory"); } void enable_serror_exceptions(void) { __asm__ __volatile__("msr DAIFClr, %0\n\t" : : "i" (DAIF_ABT_BIT) : "memory"); } void enable_irq(void) { __asm__ __volatile__("msr DAIFClr, %0\n\t" : : "i" (DAIF_IRQ_BIT) : "memory"); } void enable_fiq(void) { __asm__ __volatile__("msr DAIFClr, %0\n\t" : : "i" (DAIF_FIQ_BIT) : "memory"); } void disable_debug_exceptions(void) { __asm__ __volatile__("msr DAIFSet, %0\n\t" : : "i" (DAIF_DBG_BIT) : "memory"); } void disable_serror_exceptions(void) { __asm__ __volatile__("msr DAIFSet, %0\n\t" : : "i" (DAIF_ABT_BIT) : "memory"); } void disable_irq(void) { __asm__ __volatile__("msr DAIFSet, %0\n\t" : : "i" (DAIF_IRQ_BIT) : "memory"); } void disable_fiq(void) { __asm__ __volatile__("msr DAIFSet, %0\n\t" : : "i" (DAIF_FIQ_BIT) : "memory"); } /* DLR_EL0 */ uint64_t raw_read_dlr_el0(void) { uint64_t dlr_el0; __asm__ __volatile__("mrs %0, DLR_EL0\n\t" : "=r" (dlr_el0) : : "memory"); return dlr_el0; } void raw_write_dlr_el0(uint64_t dlr_el0) { __asm__ __volatile__("msr DLR_EL0, %0\n\t" : : "r" (dlr_el0) : "memory"); } /* DSPSR_EL0 */ uint64_t raw_read_dspsr_el0(void) { uint64_t dspsr_el0; __asm__ __volatile__("mrs %0, DSPSR_EL0\n\t" : "=r" (dspsr_el0) : : "memory"); return dspsr_el0; } void raw_write_dspsr_el0(uint64_t dspsr_el0) { __asm__ __volatile__("msr DSPSR_EL0, %0\n\t" : : "r" (dspsr_el0) : "memory"); } /* ELR */ uint64_t raw_read_elr_el1(void) { uint64_t elr_el1; __asm__ __volatile__("mrs %0, ELR_EL1\n\t" : "=r" (elr_el1) : : "memory"); return elr_el1; } void raw_write_elr_el1(uint64_t elr_el1) { __asm__ __volatile__("msr ELR_EL1, %0\n\t" : : "r" (elr_el1) : "memory"); } uint64_t raw_read_elr_el2(void) { uint64_t elr_el2; __asm__ __volatile__("mrs %0, ELR_EL2\n\t" : "=r" (elr_el2) : : "memory"); return elr_el2; } void raw_write_elr_el2(uint64_t elr_el2) { __asm__ __volatile__("msr ELR_EL2, %0\n\t" : : "r" (elr_el2) : "memory"); } uint64_t raw_read_elr_el3(void) { uint64_t elr_el3; __asm__ __volatile__("mrs %0, ELR_EL3\n\t" : "=r" (elr_el3) : : "memory"); return elr_el3; } void raw_write_elr_el3(uint64_t elr_el3) { __asm__ __volatile__("msr ELR_EL3, %0\n\t" : : "r" (elr_el3) : "memory"); } uint64_t raw_read_elr_current(void) { uint32_t el = get_current_el(); return raw_read_elr(el); } void raw_write_elr_current(uint64_t elr) { uint32_t el = get_current_el(); raw_write_elr(elr, el); } uint64_t raw_read_elr(uint32_t el) { SWITCH_CASE_READ(raw_read_elr, elr, uint64_t, el); } void raw_write_elr(uint64_t elr, uint32_t el) { SWITCH_CASE_WRITE(raw_write_elr, elr, el); } /* FPCR */ uint32_t raw_read_fpcr(void) { uint32_t fpcr; __asm__ __volatile__("mrs %0, FPCR\n\t" : "=r" (fpcr) : : "memory"); return fpcr; } void raw_write_fpcr(uint32_t fpcr) { __asm__ __volatile__("msr FPCR, %0\n\t" : : "r" (fpcr) : "memory"); } /* FPSR */ uint32_t raw_read_fpsr(void) { uint32_t fpsr; __asm__ __volatile__("mrs %0, FPSR\n\t" : "=r" (fpsr) : : "memory"); return fpsr; } void raw_write_fpsr(uint32_t fpsr) { __asm__ __volatile__("msr FPSR, %0\n\t" : : "r" (fpsr) : "memory"); } /* NZCV */ uint32_t raw_read_nzcv(void) { uint32_t nzcv; __asm__ __volatile__("mrs %0, NZCV\n\t" : "=r" (nzcv) : : "memory"); return nzcv; } void raw_write_nzcv(uint32_t nzcv) { __asm__ __volatile__("msr NZCV, %0\n\t" : : "r" (nzcv) : "memory"); } /* SP */ uint64_t raw_read_sp_el0(void) { uint64_t sp_el0; __asm__ __volatile__("mrs %0, SP_EL0\n\t" : "=r" (sp_el0) : : "memory"); return sp_el0; } void raw_write_sp_el0(uint64_t sp_el0) { __asm__ __volatile__("msr SP_EL0, %0\n\t" : : "r" (sp_el0) : "memory"); } uint64_t raw_read_sp_el1(void) { uint64_t sp_el1; __asm__ __volatile__("mrs %0, SP_EL1\n\t" : "=r" (sp_el1) : : "memory"); return sp_el1; } void raw_write_sp_el1(uint64_t sp_el1) { __asm__ __volatile__("msr SP_EL1, %0\n\t" : : "r" (sp_el1) : "memory"); } uint64_t raw_read_sp_el2(void) { uint64_t sp_el2; __asm__ __volatile__("mrs %0, SP_EL2\n\t" : "=r" (sp_el2) : : "memory"); return sp_el2; } void raw_write_sp_el2(uint64_t sp_el2) { __asm__ __volatile__("msr SP_EL2, %0\n\t" : : "r" (sp_el2) : "memory"); } /* SPSel */ uint32_t raw_read_spsel(void) { uint32_t spsel; __asm__ __volatile__("mrs %0, SPSel\n\t" : "=r" (spsel) : : "memory"); return spsel; } void raw_write_spsel(uint32_t spsel) { __asm__ __volatile__("msr SPSel, %0\n\t" : : "r" (spsel) : "memory"); } uint64_t raw_read_sp_el3(void) { uint64_t sp_el3; uint32_t spsel; spsel = raw_read_spsel(); if (!spsel) raw_write_spsel(1); __asm__ __volatile__("mov %0, sp\n\t" : "=r" (sp_el3) : : "memory"); if (!spsel) raw_write_spsel(spsel); return sp_el3; } void raw_write_sp_el3(uint64_t sp_el3) { uint32_t spsel; spsel = raw_read_spsel(); if (!spsel) raw_write_spsel(1); __asm__ __volatile__("mov sp, %0\n\t" : "=r" (sp_el3) : : "memory"); if (!spsel) raw_write_spsel(spsel); } /* SPSR */ uint32_t raw_read_spsr_abt(void) { uint32_t spsr_abt; __asm__ __volatile__("mrs %0, SPSR_abt\n\t" : "=r" (spsr_abt) : : "memory"); return spsr_abt; } void raw_write_spsr_abt(uint32_t spsr_abt) { __asm__ __volatile__("msr SPSR_abt, %0\n\t" : : "r" (spsr_abt) : "memory"); } uint32_t raw_read_spsr_el1(void) { uint32_t spsr_el1; __asm__ __volatile__("mrs %0, SPSR_EL1\n\t" : "=r" (spsr_el1) : : "memory"); return spsr_el1; } void raw_write_spsr_el1(uint32_t spsr_el1) { __asm__ __volatile__("msr SPSR_EL1, %0\n\t" : : "r" (spsr_el1) : "memory"); } uint32_t raw_read_spsr_el2(void) { uint32_t spsr_el2; __asm__ __volatile__("mrs %0, SPSR_EL2\n\t" : "=r" (spsr_el2) : : "memory"); return spsr_el2; } void raw_write_spsr_el2(uint32_t spsr_el2) { __asm__ __volatile__("msr SPSR_EL2, %0\n\t" : : "r" (spsr_el2) : "memory"); } uint32_t raw_read_spsr_el3(void) { uint32_t spsr_el3; __asm__ __volatile__("mrs %0, SPSR_EL3\n\t" : "=r" (spsr_el3) : : "memory"); return spsr_el3; } void raw_write_spsr_el3(uint32_t spsr_el3) { __asm__ __volatile__("msr SPSR_EL3, %0\n\t" : : "r" (spsr_el3) : "memory"); } uint32_t raw_read_spsr_current(void) { uint32_t el = get_current_el(); return raw_read_spsr(el); } void raw_write_spsr_current(uint32_t spsr) { uint32_t el = get_current_el(); raw_write_spsr(spsr, el); } uint32_t raw_read_spsr(uint32_t el) { SWITCH_CASE_READ(raw_read_spsr, spsr, uint32_t, el); } void raw_write_spsr(uint32_t spsr, uint32_t el) { SWITCH_CASE_WRITE(raw_write_spsr, spsr, el); } uint32_t raw_read_spsr_fiq(void) { uint32_t spsr_fiq; __asm__ __volatile__("mrs %0, SPSR_fiq\n\t" : "=r" (spsr_fiq) : : "memory"); return spsr_fiq; } void raw_write_spsr_fiq(uint32_t spsr_fiq) { __asm__ __volatile__("msr SPSR_fiq, %0\n\t" : : "r" (spsr_fiq) : "memory"); } uint32_t raw_read_spsr_irq(void) { uint32_t spsr_irq; __asm__ __volatile__("mrs %0, SPSR_irq\n\t" : "=r" (spsr_irq) : : "memory"); return spsr_irq; } void raw_write_spsr_irq(uint32_t spsr_irq) { __asm__ __volatile__("msr SPSR_irq, %0\n\t" : : "r" (spsr_irq) : "memory"); } uint32_t raw_read_spsr_und(void) { uint32_t spsr_und; __asm__ __volatile__("mrs %0, SPSR_und\n\t" : "=r" (spsr_und) : : "memory"); return spsr_und; } void raw_write_spsr_und(uint32_t spsr_und) { __asm__ __volatile__("msr SPSR_und, %0\n\t" : : "r" (spsr_und) : "memory"); }