/* * Copyright (c) 2013, ARM Limited. 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 .globl platform_get_entrypoint .globl platform_cold_boot_init .globl plat_secondary_cold_boot_setup .section platform_code, "ax"; .align 3 .macro platform_choose_gicmmap param1, param2, x_tmp, w_tmp, res ldr \x_tmp, =VE_SYSREGS_BASE + V2M_SYS_ID ldr \w_tmp, [\x_tmp] ubfx \w_tmp, \w_tmp, #SYS_ID_BLD_SHIFT, #SYS_ID_BLD_LENGTH cmp \w_tmp, #BLD_GIC_VE_MMAP csel \res, \param1, \param2, eq .endm /* ----------------------------------------------------- * void plat_secondary_cold_boot_setup (void); * * This function performs any platform specific actions * needed for a secondary cpu after a cold reset e.g * mark the cpu's presence, mechanism to place it in a * holding pen etc. * TODO: Should we read the PSYS register to make sure * that the request has gone through. * ----------------------------------------------------- */ plat_secondary_cold_boot_setup:; .type plat_secondary_cold_boot_setup, %function bl read_mpidr mov x19, x0 bl platform_get_core_pos mov x20, x0 /* --------------------------------------------- * Mark this cpu as being present. This is a * SO write. This array will be read using * normal memory so invalidate any prefetched * stale copies first. * --------------------------------------------- */ ldr x1, =TZDRAM_BASE mov x0, #AFFMAP_OFF add x1, x0, x1 mov x2, #PLATFORM_CACHE_LINE_SIZE mul x2, x2, x20 add x0, x1, x2 bl dcivac str x19, [x1, x2] /* --------------------------------------------- * Power down this cpu. * TODO: Do we need to worry about powering the * cluster down as well here. That will need * locks which we won't have unless an elf- * loader zeroes out the zi section. * --------------------------------------------- */ ldr x1, =PWRC_BASE str w19, [x1, #PPOFFR_OFF] /* --------------------------------------------- * Deactivate the gic cpu interface as well * --------------------------------------------- */ ldr x0, =VE_GICC_BASE ldr x1, =BASE_GICC_BASE platform_choose_gicmmap x0, x1, x2, w2, x1 mov w0, #(IRQ_BYP_DIS_GRP1 | FIQ_BYP_DIS_GRP1) orr w0, w0, #(IRQ_BYP_DIS_GRP0 | FIQ_BYP_DIS_GRP0) str w0, [x1, #GICC_CTLR] /* --------------------------------------------- * There is no sane reason to come out of this * wfi so panic if we do. This cpu will be pow- * ered on and reset by the cpu_on pm api * --------------------------------------------- */ dsb sy wfi cb_panic: b cb_panic /* ----------------------------------------------------- * void platform_get_entrypoint (unsigned int mpid); * * Main job of this routine is to distinguish between * a cold and warm boot. * On a cold boot the secondaries first wait for the * platform to be initialized after which they are * hotplugged in. The primary proceeds to perform the * platform initialization. * On a warm boot, each cpu jumps to the address in its * mailbox. * * TODO: Not a good idea to save lr in a temp reg * TODO: PSYSR is a common register and should be * accessed using locks. Since its not possible * to use locks immediately after a cold reset * we are relying on the fact that after a cold * reset all cpus will read the same WK field * ----------------------------------------------------- */ platform_get_entrypoint:; .type platform_get_entrypoint, %function mov x9, x30 // lr mov x2, x0 ldr x1, =PWRC_BASE str w2, [x1, #PSYSR_OFF] ldr w2, [x1, #PSYSR_OFF] ubfx w2, w2, #PSYSR_WK_SHIFT, #PSYSR_WK_MASK cbnz w2, warm_reset mov x0, x2 b exit warm_reset: /* --------------------------------------------- * A per-cpu mailbox is maintained in the tru- * sted DRAM. Its flushed out of the caches * after every update using normal memory so * its safe to read it here with SO attributes * --------------------------------------------- */ ldr x10, =TZDRAM_BASE + MBOX_OFF bl platform_get_core_pos lsl x0, x0, #CACHE_WRITEBACK_SHIFT ldr x0, [x10, x0] cbz x0, _panic exit: ret x9 _panic: b _panic /* ----------------------------------------------------- * void platform_mem_init (void); * * Zero out the mailbox registers in the TZDRAM. The * mmu is turned off right now and only the primary can * ever execute this code. Secondaries will read the * mailboxes using SO accesses. In short, BL31 will * update the mailboxes after mapping the tzdram as * normal memory. It will flush its copy after update. * BL1 will always read the mailboxes with the MMU off * ----------------------------------------------------- */ platform_mem_init:; .type platform_mem_init, %function ldr x0, =TZDRAM_BASE + MBOX_OFF stp xzr, xzr, [x0, #0] stp xzr, xzr, [x0, #0x10] stp xzr, xzr, [x0, #0x20] stp xzr, xzr, [x0, #0x30] ret /* ----------------------------------------------------- * void platform_cold_boot_init (bl1_main function); * * Routine called only by the primary cpu after a cold * boot to perform early platform initialization * ----------------------------------------------------- */ platform_cold_boot_init:; .type platform_cold_boot_init, %function mov x20, x0 bl platform_mem_init bl read_mpidr mov x19, x0 /* --------------------------------------------- * Give ourselves a small coherent stack to * ease the pain of initializing the MMU and * CCI in assembler * --------------------------------------------- */ bl platform_set_coherent_stack /* --------------------------------------------- * Mark this cpu as being present. This is a * SO write. Invalidate any stale copies out of * paranoia as there is no one else around. * --------------------------------------------- */ mov x0, x19 bl platform_get_core_pos mov x21, x0 ldr x1, =TZDRAM_BASE mov x0, #AFFMAP_OFF add x1, x0, x1 mov x2, #PLATFORM_CACHE_LINE_SIZE mul x2, x2, x21 add x0, x1, x2 bl dcivac str x19, [x1, x2] /* --------------------------------------------- * Architectural init. can be generic e.g. * enabling stack alignment and platform spec- * ific e.g. MMU & page table setup as per the * platform memory map. Perform the latter here * and the former in bl1_main. * --------------------------------------------- */ bl bl1_early_platform_setup bl bl1_plat_arch_setup /* --------------------------------------------- * Give ourselves a stack allocated in Normal * -IS-WBWA memory * --------------------------------------------- */ mov x0, x19 bl platform_set_stack /* --------------------------------------------- * Jump to the main function. Returning from it * is a terminal error. * --------------------------------------------- */ blr x20 cb_init_panic: b cb_init_panic