*
* Copyright (c) 2012 Albert ARIBAUD <albert.u.boot@aribaud.net>
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <asm-offsets.h>
+#include <linux/linkage.h>
+#ifdef CONFIG_CPU_V7M
+#include <asm/armv7m.h>
+#endif
/*
* This file handles the target-independent stages of the U-Boot
* have some work left to do at this point regarding memory, so
* call c_runtime_cpu_setup.
*
- * 6. Branch to either nand_boot() or board_init_r().
- */
-
-/*
- * declare nand_boot() or board_init_r() to jump to at end of crt0
- */
-
-#if defined(CONFIG_NAND_SPL)
-
-.globl nand_boot
-
-#elif ! defined(CONFIG_SPL_BUILD)
-
-.globl board_init_r
-
-#endif
-
-/*
- * start and end of BSS
+ * 6. Branch to board_init_r().
*/
-.globl __bss_start
-.globl __bss_end__
-
/*
* entry point of crt0 sequence
*/
-.global _main
-
-_main:
+ENTRY(_main)
/*
* Set up initial C runtime environment and call board_init_f(0).
*/
-#if defined(CONFIG_NAND_SPL)
- /* deprecated, use instead CONFIG_SPL_BUILD */
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
-#elif defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
ldr sp, =(CONFIG_SPL_STACK)
#else
ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
#endif
+#if defined(CONFIG_CPU_V7M) /* v7M forbids using SP as BIC destination */
+ mov r3, sp
+ bic r3, r3, #7
+ mov sp, r3
+#else
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- sub sp, #GD_SIZE /* allocate one GD above SP */
+#endif
+ mov r2, sp
+ sub sp, sp, #GD_SIZE /* allocate one GD above SP */
+#if defined(CONFIG_CPU_V7M) /* v7M forbids using SP as BIC destination */
+ mov r3, sp
+ bic r3, r3, #7
+ mov sp, r3
+#else
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- mov r8, sp /* GD is above SP */
+#endif
+ mov r9, sp /* GD is above SP */
+ mov r1, sp
mov r0, #0
+clr_gd:
+ cmp r1, r2 /* while not at end of GD */
+#if defined(CONFIG_CPU_V7M)
+ itt lo
+#endif
+ strlo r0, [r1] /* clear 32-bit GD word */
+ addlo r1, r1, #4 /* move to next */
+ blo clr_gd
+#if defined(CONFIG_SYS_MALLOC_F_LEN)
+ sub sp, sp, #CONFIG_SYS_MALLOC_F_LEN
+ str sp, [r9, #GD_MALLOC_BASE]
+#endif
+ /* mov r0, #0 not needed due to above code */
bl board_init_f
#if ! defined(CONFIG_SPL_BUILD)
/*
* Set up intermediate environment (new sp and gd) and call
- * relocate_code(addr_sp, gd, addr_moni). Trick here is that
- * we'll return 'here' but relocated.
+ * relocate_code(addr_moni). Trick here is that we'll return
+ * 'here' but relocated.
*/
- ldr sp, [r8, #GD_START_ADDR_SP] /* r8 = gd->start_addr_sp */
+ ldr sp, [r9, #GD_START_ADDR_SP] /* sp = gd->start_addr_sp */
+#if defined(CONFIG_CPU_V7M) /* v7M forbids using SP as BIC destination */
+ mov r3, sp
+ bic r3, r3, #7
+ mov sp, r3
+#else
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r8, [r8, #GD_BD] /* r8 = gd->bd */
- sub r8, r8, #GD_SIZE /* new GD is below bd */
+#endif
+ ldr r9, [r9, #GD_BD] /* r9 = gd->bd */
+ sub r9, r9, #GD_SIZE /* new GD is below bd */
adr lr, here
- ldr r0, [r8, #GD_RELOC_OFF] /* lr = gd->start_addr_sp */
+ ldr r0, [r9, #GD_RELOC_OFF] /* r0 = gd->reloc_off */
add lr, lr, r0
- ldr r0, [r8, #GD_START_ADDR_SP] /* r0 = gd->start_addr_sp */
- mov r1, r8 /* r1 = gd */
- ldr r2, [r8, #GD_RELOCADDR] /* r2 = gd->relocaddr */
+#if defined(CONFIG_CPU_V7M)
+ orr lr, #1 /* As required by Thumb-only */
+#endif
+ ldr r0, [r9, #GD_RELOCADDR] /* r0 = gd->relocaddr */
b relocate_code
here:
+/*
+ * now relocate vectors
+ */
+
+ bl relocate_vectors
/* Set up final (full) environment */
bl c_runtime_cpu_setup /* we still call old routine here */
-
+#endif
+#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_FRAMEWORK)
+# ifdef CONFIG_SPL_BUILD
+ /* Use a DRAM stack for the rest of SPL, if requested */
+ bl spl_relocate_stack_gd
+ cmp r0, #0
+ movne sp, r0
+# endif
ldr r0, =__bss_start /* this is auto-relocated! */
- ldr r1, =__bss_end__ /* this is auto-relocated! */
+#ifdef CONFIG_USE_ARCH_MEMSET
+ ldr r3, =__bss_end /* this is auto-relocated! */
+ mov r1, #0x00000000 /* prepare zero to clear BSS */
+
+ subs r2, r3, r0 /* r2 = memset len */
+ bl memset
+#else
+ ldr r1, =__bss_end /* this is auto-relocated! */
mov r2, #0x00000000 /* prepare zero to clear BSS */
clbss_l:cmp r0, r1 /* while not at end of BSS */
+#if defined(CONFIG_CPU_V7M)
+ itt lo
+#endif
strlo r2, [r0] /* clear 32-bit BSS word */
addlo r0, r0, #4 /* move to next */
blo clbss_l
+#endif
+#if ! defined(CONFIG_SPL_BUILD)
bl coloured_LED_init
bl red_led_on
-
-#if defined(CONFIG_NAND_SPL)
-
- /* call _nand_boot() */
- ldr pc, =nand_boot
-
-#else
-
+#endif
/* call board_init_r(gd_t *id, ulong dest_addr) */
- mov r0, r8 /* gd_t */
- ldr r1, [r8, #GD_RELOCADDR] /* dest_addr */
+ mov r0, r9 /* gd_t */
+ ldr r1, [r9, #GD_RELOCADDR] /* dest_addr */
/* call board_init_r */
ldr pc, =board_init_r /* this is auto-relocated! */
-#endif
-
/* we should not return here. */
-
#endif
+
+ENDPROC(_main)