1 /* SPDX-License-Identifier: GPL-2.0+ */
4 * David Feng <fenghua@phytium.com.cn>
7 #include <asm-offsets.h>
9 #include <linux/linkage.h>
10 #include <asm/macro.h>
11 #include <asm/armv8/mmu.h>
13 /*************************************************************************
15 * Startup Code (reset vector)
17 *************************************************************************/
21 #if defined(CONFIG_LINUX_KERNEL_IMAGE_HEADER)
22 #include <asm/boot0-linux-kernel-header.h>
23 #elif defined(CONFIG_ENABLE_ARM_SOC_BOOT0_HOOK)
25 * Various SoCs need something special and SoC-specific up front in
26 * order to boot, allow them to set that in their boot0.h file and then
29 #include <asm/arch/boot0.h>
38 .quad CONFIG_SYS_TEXT_BASE
41 * These are defined in the linker script.
49 .quad __bss_start - _start
53 .quad __bss_end - _start
56 /* Allow the board to save important registers */
58 .globl save_boot_params_ret
61 #if CONFIG_POSITION_INDEPENDENT
62 /* Verify that we're 4K aligned. */
68 * FATAL, can't continue.
69 * U-Boot needs to be loaded at a 4K aligned address.
71 * We use ADRP and ADD to load some symbol addresses during startup.
72 * The ADD uses an absolute (non pc-relative) lo12 relocation
73 * thus requiring 4K alignment.
80 * Fix .rela.dyn relocations. This allows U-Boot to be loaded to and
81 * executed at a different address than it was linked at.
84 adr x0, _start /* x0 <- Runtime value of _start */
85 ldr x1, _TEXT_BASE /* x1 <- Linked value of _start */
86 subs x9, x0, x1 /* x9 <- Run-vs-link offset */
88 adrp x2, __rel_dyn_start /* x2 <- Runtime &__rel_dyn_start */
89 add x2, x2, #:lo12:__rel_dyn_start
90 adrp x3, __rel_dyn_end /* x3 <- Runtime &__rel_dyn_end */
91 add x3, x3, #:lo12:__rel_dyn_end
93 ldp x0, x1, [x2], #16 /* (x0, x1) <- (Link location, fixup) */
94 ldr x4, [x2], #8 /* x4 <- addend */
95 cmp w1, #1027 /* relative fixup? */
97 /* relative fix: store addend plus offset at dest location */
107 #ifdef CONFIG_SYS_RESET_SCTRL
111 #if defined(CONFIG_ARMV8_SPL_EXCEPTION_VECTORS) || !defined(CONFIG_SPL_BUILD)
112 .macro set_vbar, regname, reg
117 .macro set_vbar, regname, reg
121 * Could be EL3/EL2/EL1, Initial State:
122 * Little Endian, MMU Disabled, i/dCache Disabled
124 switch_el x1, 3f, 2f, 1f
125 3: set_vbar vbar_el3, x0
127 orr x0, x0, #0xf /* SCR_EL3.NS|IRQ|FIQ|EA */
129 msr cptr_el3, xzr /* Enable FP/SIMD */
130 #ifdef COUNTER_FREQUENCY
131 ldr x0, =COUNTER_FREQUENCY
132 msr cntfrq_el0, x0 /* Initialize CNTFRQ */
135 2: set_vbar vbar_el2, x0
137 msr cptr_el2, x0 /* Enable FP/SIMD */
139 1: set_vbar vbar_el1, x0
141 msr cpacr_el1, x0 /* Enable FP/SIMD */
146 * Enable SMPEN bit for coherency.
147 * This register is not architectural but at the moment
148 * this bit should be set for A53/A57/A72.
150 #ifdef CONFIG_ARMV8_SET_SMPEN
151 switch_el x1, 3f, 1f, 1f
153 mrs x0, S3_1_c15_c2_1 /* cpuectlr_el1 */
155 msr S3_1_c15_c2_1, x0
160 /* Apply ARM core specific erratas */
164 * Cache/BPB/TLB Invalidate
165 * i-cache is invalidated before enabled in icache_enable()
166 * tlb is invalidated before mmu is enabled in dcache_enable()
167 * d-cache is invalidated before enabled in dcache_enable()
170 /* Processor specific initialization */
173 #if defined(CONFIG_ARMV8_SPIN_TABLE) && !defined(CONFIG_SPL_BUILD)
174 branch_if_master x0, x1, master_cpu
175 b spin_table_secondary_jump
177 #elif defined(CONFIG_ARMV8_MULTIENTRY)
178 branch_if_master x0, x1, master_cpu
185 ldr x1, =CPU_RELEASE_ADDR
188 br x0 /* branch to the given address */
189 #endif /* CONFIG_ARMV8_MULTIENTRY */
193 #ifdef CONFIG_SYS_RESET_SCTRL
195 switch_el x1, 3f, 2f, 1f
209 switch_el x1, 6f, 5f, 4f
222 b __asm_invalidate_tlb_all
226 /*-----------------------------------------------------------------------*/
228 WEAK(apply_core_errata)
230 mov x29, lr /* Save LR */
231 /* For now, we support Cortex-A53, Cortex-A57 specific errata */
233 /* Check if we are running on a Cortex-A53 core */
234 branch_if_a53_core x0, apply_a53_core_errata
236 /* Check if we are running on a Cortex-A57 core */
237 branch_if_a57_core x0, apply_a57_core_errata
239 mov lr, x29 /* Restore LR */
242 apply_a53_core_errata:
244 #ifdef CONFIG_ARM_ERRATA_855873
254 mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
255 /* Enable data cache clean as data cache clean/invalidate */
257 msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
262 apply_a57_core_errata:
264 #ifdef CONFIG_ARM_ERRATA_828024
265 mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
266 /* Disable non-allocate hint of w-b-n-a memory type */
268 /* Disable write streaming no L1-allocate threshold */
270 /* Disable write streaming no-allocate threshold */
272 msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
276 #ifdef CONFIG_ARM_ERRATA_826974
277 mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
278 /* Disable speculative load execution ahead of a DMB */
280 msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
284 #ifdef CONFIG_ARM_ERRATA_833471
285 mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
286 /* FPSCR write flush.
287 * Note that in some cases where a flush is unnecessary this
288 could impact performance. */
290 msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
294 #ifdef CONFIG_ARM_ERRATA_829520
295 mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
296 /* Disable Indirect Predictor bit will prevent this erratum
298 * Note that in some cases where a flush is unnecessary this
299 could impact performance. */
301 msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
305 #ifdef CONFIG_ARM_ERRATA_833069
306 mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
307 /* Disable Enable Invalidates of BTB bit */
309 msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
313 ENDPROC(apply_core_errata)
315 /*-----------------------------------------------------------------------*/
318 mov x29, lr /* Save LR */
320 #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
321 branch_if_slave x0, 1f
325 #if defined(CONFIG_GICV3)
327 bl gic_init_secure_percpu
328 #elif defined(CONFIG_GICV2)
331 bl gic_init_secure_percpu
335 #ifdef CONFIG_ARMV8_MULTIENTRY
336 branch_if_master x0, x1, 2f
339 * Slave should wait for master clearing spin table.
340 * This sync prevent salves observing incorrect
341 * value of spin table and jumping to wrong place.
343 #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
347 bl gic_wait_for_interrupt
351 * All slaves will enter EL2 and optionally EL1.
353 adr x4, lowlevel_in_el2
354 ldr x5, =ES_TO_AARCH64
355 bl armv8_switch_to_el2
358 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
359 adr x4, lowlevel_in_el1
360 ldr x5, =ES_TO_AARCH64
361 bl armv8_switch_to_el1
366 #endif /* CONFIG_ARMV8_MULTIENTRY */
369 mov lr, x29 /* Restore LR */
371 ENDPROC(lowlevel_init)
373 WEAK(smp_kick_all_cpus)
374 /* Kick secondary cpus up by SGI 0 interrupt */
375 #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
377 b gic_kick_secondary_cpus
380 ENDPROC(smp_kick_all_cpus)
382 /*-----------------------------------------------------------------------*/
384 ENTRY(c_runtime_cpu_setup)
385 #if defined(CONFIG_ARMV8_SPL_EXCEPTION_VECTORS) || !defined(CONFIG_SPL_BUILD)
388 switch_el x1, 3f, 2f, 1f
398 ENDPROC(c_runtime_cpu_setup)
400 WEAK(save_boot_params)
401 b save_boot_params_ret /* back to my caller */
402 ENDPROC(save_boot_params)