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authorAlbert ARIBAUD <albert.u.boot@aribaud.net>2013-01-08 10:18:02 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2013-01-08 22:14:50 +0100
commite05e5de7fae5bec79617e113916dac6631251156 (patch)
treec4d2bedca6e1ec79e30b229d2da6b979276456af /arch/arm/lib
parent7528cf5f016b5b8b8b12b373f6f31a10bf89233d (diff)
arm: move C runtime setup code in crt0.S
Move all the C runtime setup code from every start.S in arch/arm into arch/arm/lib/crt0.S. This covers the code sequence from setting up the initial stack to calling into board_init_r(). Also, rewrite the C runtime setup and make functions board_init_*() and relocate_code() behave according to normal C semantics (no jumping across the C stack any more, etc). Some SPL targets had to be touched because they use start.S explicitly or for some reason; the relevant maintainers and custodians are cc:ed. Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
Diffstat (limited to 'arch/arm/lib')
-rw-r--r--arch/arm/lib/Makefile2
-rw-r--r--arch/arm/lib/board.c11
-rw-r--r--arch/arm/lib/crt0.S173
3 files changed, 175 insertions, 11 deletions
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 3422ac1c5f..07baee2ec6 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -36,6 +36,8 @@ GLSOBJS += _umodsi3.o
GLCOBJS += div0.o
+SOBJS-y += crt0.o
+
ifndef CONFIG_SPL_BUILD
COBJS-y += board.o
COBJS-y += bootm.o
diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index e0cb6353a3..0459d0ce9f 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -279,11 +279,6 @@ void board_init_f(ulong bootflag)
bootstage_mark_name(BOOTSTAGE_ID_START_UBOOT_F, "board_init_f");
- /* Pointer is writable since we allocated a register for it */
- gd = (gd_t *) ((CONFIG_SYS_INIT_SP_ADDR) & ~0x07);
- /* compiler optimization barrier needed for GCC >= 3.4 */
- __asm__ __volatile__("": : :"memory");
-
memset((void *)gd, 0, sizeof(gd_t));
gd->mon_len = _bss_end_ofs;
@@ -465,10 +460,6 @@ void board_init_f(ulong bootflag)
gd->fdt_blob = new_fdt;
}
memcpy(id, (void *)gd, sizeof(gd_t));
-
- relocate_code(addr_sp, id, addr);
-
- /* NOTREACHED - relocate_code() does not return */
}
#if !defined(CONFIG_SYS_NO_FLASH)
@@ -493,8 +484,6 @@ void board_init_r(gd_t *id, ulong dest_addr)
ulong flash_size;
#endif
- gd = id;
-
gd->flags |= GD_FLG_RELOC; /* tell others: relocation done */
bootstage_mark_name(BOOTSTAGE_ID_START_UBOOT_R, "board_init_r");
diff --git a/arch/arm/lib/crt0.S b/arch/arm/lib/crt0.S
new file mode 100644
index 0000000000..4f60958b1d
--- /dev/null
+++ b/arch/arm/lib/crt0.S
@@ -0,0 +1,173 @@
+/*
+ * crt0 - C-runtime startup Code for ARM U-Boot
+ *
+ * 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
+ */
+
+#include <config.h>
+#include <asm-offsets.h>
+
+/*
+ * This file handles the target-independent stages of the U-Boot
+ * start-up where a C runtime environment is needed. Its entry point
+ * is _main and is branched into from the target's start.S file.
+ *
+ * _main execution sequence is:
+ *
+ * 1. Set up initial environment for calling board_init_f().
+ * This environment only provides a stack and a place to store
+ * the GD ('global data') structure, both located in some readily
+ * available RAM (SRAM, locked cache...). In this context, VARIABLE
+ * global data, initialized or not (BSS), are UNAVAILABLE; only
+ * CONSTANT initialized data are available.
+ *
+ * 2. Call board_init_f(). This function prepares the hardware for
+ * execution from system RAM (DRAM, DDR...) As system RAM may not
+ * be available yet, , board_init_f() must use the current GD to
+ * store any data which must be passed on to later stages. These
+ * data include the relocation destination, the future stack, and
+ * the future GD location.
+ *
+ * (the following applies only to non-SPL builds)
+ *
+ * 3. Set up intermediate environment where the stack and GD are the
+ * ones allocated by board_init_f() in system RAM, but BSS and
+ * initialized non-const data are still not available.
+ *
+ * 4. Call relocate_code(). This function relocates U-Boot from its
+ * current location into the relocation destination computed by
+ * board_init_f().
+ *
+ * 5. Set up final environment for calling board_init_r(). This
+ * environment has BSS (initialized to 0), initialized non-const
+ * data (initialized to their intended value), and stack in system
+ * RAM. GD has retained values set by board_init_f(). Some CPUs
+ * 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
+ */
+
+.globl __bss_start
+.globl __bss_end__
+
+/*
+ * entry point of crt0 sequence
+ */
+
+.global _main
+
+_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)
+ ldr sp, =(CONFIG_SPL_STACK)
+#else
+ ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
+#endif
+ bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
+ sub sp, #GD_SIZE /* allocate one GD above SP */
+ bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
+ mov r8, sp /* GD is above SP */
+ mov r0, #0
+ 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.
+ */
+
+ ldr sp, [r8, #GD_START_ADDR_SP] /* r8 = gd->start_addr_sp */
+ 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 */
+
+ adr lr, here
+ ldr r0, [r8, #GD_RELOC_OFF] /* lr = gd->start_addr_sp */
+ 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 */
+ b relocate_code
+here:
+
+/* Set up final (full) environment */
+
+ bl c_runtime_cpu_setup /* we still call old routine here */
+
+ ldr r0, =__bss_start /* this is auto-relocated! */
+ 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 */
+ strlo r2, [r0] /* clear 32-bit BSS word */
+ addlo r0, r0, #4 /* move to next */
+ blo clbss_l
+
+ bl coloured_LED_init
+ bl red_led_on
+
+#if defined(CONFIG_NAND_SPL)
+
+ /* call _nand_boot() */
+ ldr pc, =nand_boot
+
+#else
+
+ /* call board_init_r(gd_t *id, ulong dest_addr) */
+ mov r0, r8 /* gd_t */
+ ldr r1, [r8, #GD_RELOCADDR] /* dest_addr */
+ /* call board_init_r */
+ ldr pc, =board_init_r /* this is auto-relocated! */
+
+#endif
+
+ /* we should not return here. */
+
+#endif