/* * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 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. * * Neither the name of ARM nor the names of its contributors may be used * to endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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. */ #include #include #include #include #include #include #include #define MIDR_PN_CORTEX_A57 0xD07 /******************************************************************************* * Implementation defined ACTLR_EL3 bit definitions ******************************************************************************/ #define ACTLR_EL3_L2ACTLR_BIT (1 << 6) #define ACTLR_EL3_L2ECTLR_BIT (1 << 5) #define ACTLR_EL3_L2CTLR_BIT (1 << 4) #define ACTLR_EL3_CPUECTLR_BIT (1 << 1) #define ACTLR_EL3_CPUACTLR_BIT (1 << 0) #define ACTLR_EL3_ENABLE_ALL_ACCESS (ACTLR_EL3_L2ACTLR_BIT | \ ACTLR_EL3_L2ECTLR_BIT | \ ACTLR_EL3_L2CTLR_BIT | \ ACTLR_EL3_CPUECTLR_BIT | \ ACTLR_EL3_CPUACTLR_BIT) /* Global functions */ .globl plat_is_my_cpu_primary .globl plat_my_core_pos .globl plat_get_my_entrypoint .globl plat_secondary_cold_boot_setup .globl platform_mem_init .globl plat_crash_console_init .globl plat_crash_console_putc .globl tegra_secure_entrypoint .globl plat_reset_handler /* Global variables */ .globl tegra_sec_entry_point .globl ns_image_entrypoint .globl tegra_bl31_phys_base .globl tegra_console_base /* --------------------- * Common CPU init code * --------------------- */ .macro cpu_init_common /* ------------------------------------------------ * We enable procesor retention and L2/CPUECTLR NS * access for A57 CPUs only. * ------------------------------------------------ */ mrs x0, midr_el1 mov x1, #(MIDR_PN_MASK << MIDR_PN_SHIFT) and x0, x0, x1 lsr x0, x0, #MIDR_PN_SHIFT cmp x0, #MIDR_PN_CORTEX_A57 b.ne 1f /* --------------------------- * Enable processor retention * --------------------------- */ mrs x0, L2ECTLR_EL1 mov x1, #RETENTION_ENTRY_TICKS_512 << L2ECTLR_RET_CTRL_SHIFT bic x0, x0, #L2ECTLR_RET_CTRL_MASK orr x0, x0, x1 msr L2ECTLR_EL1, x0 isb mrs x0, CPUECTLR_EL1 mov x1, #RETENTION_ENTRY_TICKS_512 << CPUECTLR_CPU_RET_CTRL_SHIFT bic x0, x0, #CPUECTLR_CPU_RET_CTRL_MASK orr x0, x0, x1 msr CPUECTLR_EL1, x0 isb /* ------------------------------------------------------- * Enable L2 and CPU ECTLR RW access from non-secure world * ------------------------------------------------------- */ mov x0, #ACTLR_EL3_ENABLE_ALL_ACCESS msr actlr_el3, x0 msr actlr_el2, x0 isb /* -------------------------------- * Enable the cycle count register * -------------------------------- */ 1: mrs x0, pmcr_el0 ubfx x0, x0, #11, #5 // read PMCR.N field mov x1, #1 lsl x0, x1, x0 sub x0, x0, #1 // mask of event counters orr x0, x0, #0x80000000 // disable overflow intrs msr pmintenclr_el1, x0 msr pmuserenr_el0, x1 // enable user mode access /* ---------------------------------------------------------------- * Allow non-privileged access to CNTVCT: Set CNTKCTL (Kernel Count * register), bit 1 (EL0VCTEN) to enable access to CNTVCT/CNTFRQ * registers from EL0. * ---------------------------------------------------------------- */ mrs x0, cntkctl_el1 orr x0, x0, #EL0VCTEN_BIT msr cntkctl_el1, x0 .endm /* ----------------------------------------------------- * unsigned int plat_is_my_cpu_primary(void); * * This function checks if this is the Primary CPU * ----------------------------------------------------- */ func plat_is_my_cpu_primary mrs x0, mpidr_el1 and x0, x0, #(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK) cmp x0, #TEGRA_PRIMARY_CPU cset x0, eq ret endfunc plat_is_my_cpu_primary /* ----------------------------------------------------- * unsigned int plat_my_core_pos(void); * * result: CorePos = CoreId + (ClusterId << 2) * ----------------------------------------------------- */ func plat_my_core_pos mrs x0, mpidr_el1 and x1, x0, #MPIDR_CPU_MASK and x0, x0, #MPIDR_CLUSTER_MASK add x0, x1, x0, LSR #6 ret endfunc plat_my_core_pos /* ----------------------------------------------------- * unsigned long plat_get_my_entrypoint (void); * * Main job of this routine is to distinguish between * a cold and warm boot. If the tegra_sec_entry_point for * this CPU is present, then it's a warm boot. * * ----------------------------------------------------- */ func plat_get_my_entrypoint adr x1, tegra_sec_entry_point ldr x0, [x1] ret endfunc plat_get_my_entrypoint /* ----------------------------------------------------- * int platform_get_core_pos(int mpidr); * * With this function: CorePos = (ClusterId * 4) + * CoreId * ----------------------------------------------------- */ func platform_get_core_pos and x1, x0, #MPIDR_CPU_MASK and x0, x0, #MPIDR_CLUSTER_MASK add x0, x1, x0, LSR #6 ret endfunc platform_get_core_pos /* ----------------------------------------------------- * void plat_secondary_cold_boot_setup (void); * * This function performs any platform specific actions * needed for a secondary cpu after a cold reset. Right * now this is a stub function. * ----------------------------------------------------- */ func plat_secondary_cold_boot_setup mov x0, #0 ret endfunc plat_secondary_cold_boot_setup /* -------------------------------------------------------- * void platform_mem_init (void); * * Any memory init, relocation to be done before the * platform boots. Called very early in the boot process. * -------------------------------------------------------- */ func platform_mem_init mov x0, #0 ret endfunc platform_mem_init /* --------------------------------------------- * int plat_crash_console_init(void) * Function to initialize the crash console * without a C Runtime to print crash report. * Clobber list : x0 - x4 * --------------------------------------------- */ func plat_crash_console_init adr x0, tegra_console_base ldr x0, [x0] mov_imm x1, TEGRA_BOOT_UART_CLK_IN_HZ mov_imm x2, TEGRA_CONSOLE_BAUDRATE b console_core_init endfunc plat_crash_console_init /* --------------------------------------------- * int plat_crash_console_putc(void) * Function to print a character on the crash * console without a C Runtime. * Clobber list : x1, x2 * --------------------------------------------- */ func plat_crash_console_putc adr x1, tegra_console_base ldr x1, [x1] b console_core_putc endfunc plat_crash_console_putc /* --------------------------------------------------- * Function to handle a platform reset and store * input parameters passed by BL2. * --------------------------------------------------- */ func plat_reset_handler /* ---------------------------------------------------- * Verify if we are running from BL31_BASE address * ---------------------------------------------------- */ adr x18, bl31_entrypoint mov x17, #BL31_BASE cmp x18, x17 b.eq 1f /* ---------------------------------------------------- * Copy the entire BL31 code to BL31_BASE if we are not * running from it already * ---------------------------------------------------- */ mov x0, x17 mov x1, x18 mov x2, #BL31_SIZE _loop16: cmp x2, #16 b.lt _loop1 ldp x3, x4, [x1], #16 stp x3, x4, [x0], #16 sub x2, x2, #16 b _loop16 /* copy byte per byte */ _loop1: cbz x2, _end ldrb w3, [x1], #1 strb w3, [x0], #1 subs x2, x2, #1 b.ne _loop1 /* ---------------------------------------------------- * Jump to BL31_BASE and start execution again * ---------------------------------------------------- */ _end: mov x0, x20 mov x1, x21 br x17 1: /* ----------------------------------- * derive and save the phys_base addr * ----------------------------------- */ adr x17, tegra_bl31_phys_base ldr x18, [x17] cbnz x18, 1f adr x18, bl31_entrypoint str x18, [x17] 1: cpu_init_common ret endfunc plat_reset_handler /* ---------------------------------------- * Secure entrypoint function for CPU boot * ---------------------------------------- */ .align 6 func tegra_secure_entrypoint #if ERRATA_TEGRA_INVALIDATE_BTB_AT_BOOT /* ------------------------------------------------------- * Invalidate BTB along with I$ to remove any stale * entries from the branch predictor array. * ------------------------------------------------------- */ mrs x0, CPUACTLR_EL1 orr x0, x0, #1 msr CPUACTLR_EL1, x0 /* invalidate BTB and I$ together */ dsb sy isb ic iallu /* actual invalidate */ dsb sy isb mrs x0, CPUACTLR_EL1 bic x0, x0, #1 msr CPUACTLR_EL1, X0 /* restore original CPUACTLR_EL1 */ dsb sy isb .rept 7 nop /* wait */ .endr /* ----------------------------------------------- * Extract OSLK bit and check if it is '1'. This * bit remains '0' for A53 on warm-resets. If '1', * turn off regional clock gating and request warm * reset. * ----------------------------------------------- */ mrs x0, oslsr_el1 and x0, x0, #2 mrs x1, mpidr_el1 bics xzr, x0, x1, lsr #7 /* 0 = slow cluster or warm reset */ b.eq restore_oslock mov x0, xzr msr oslar_el1, x0 /* os lock stays 0 across warm reset */ mov x3, #3 movz x4, #0x8000, lsl #48 msr CPUACTLR_EL1, x4 /* turn off RCG */ isb msr rmr_el3, x3 /* request warm reset */ isb dsb sy 1: wfi b 1b /* -------------------------------------------------- * These nops are here so that speculative execution * won't harm us before we are done with warm reset. * -------------------------------------------------- */ .rept 65 nop .endr /* -------------------------------------------------- * Do not insert instructions here * -------------------------------------------------- */ #endif /* -------------------------------------------------- * Restore OS Lock bit * -------------------------------------------------- */ restore_oslock: mov x0, #1 msr oslar_el1, x0 cpu_init_common /* --------------------------------------------------------------------- * The initial state of the Architectural feature trap register * (CPTR_EL3) is unknown and it must be set to a known state. All * feature traps are disabled. Some bits in this register are marked as * Reserved and should not be modified. * * CPTR_EL3.TCPAC: This causes a direct access to the CPACR_EL1 from EL1 * or the CPTR_EL2 from EL2 to trap to EL3 unless it is trapped at EL2. * CPTR_EL3.TTA: This causes access to the Trace functionality to trap * to EL3 when executed from EL0, EL1, EL2, or EL3. If system register * access to trace functionality is not supported, this bit is RES0. * CPTR_EL3.TFP: This causes instructions that access the registers * associated with Floating Point and Advanced SIMD execution to trap * to EL3 when executed from any exception level, unless trapped to EL1 * or EL2. * --------------------------------------------------------------------- */ mrs x1, cptr_el3 bic w1, w1, #TCPAC_BIT bic w1, w1, #TTA_BIT bic w1, w1, #TFP_BIT msr cptr_el3, x1 /* -------------------------------------------------- * Get secure world's entry point and jump to it * -------------------------------------------------- */ bl plat_get_my_entrypoint br x0 endfunc tegra_secure_entrypoint .data .align 3 /* -------------------------------------------------- * CPU Secure entry point - resume from suspend * -------------------------------------------------- */ tegra_sec_entry_point: .quad 0 /* -------------------------------------------------- * NS world's cold boot entry point * -------------------------------------------------- */ ns_image_entrypoint: .quad 0 /* -------------------------------------------------- * BL31's physical base address * -------------------------------------------------- */ tegra_bl31_phys_base: .quad 0 /* -------------------------------------------------- * UART controller base for console init * -------------------------------------------------- */ tegra_console_base: .quad 0