Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 123 insertions, 0 deletions

diff --git a/qemu/roms/u-boot/arch/arm/lib/crt0.S b/qemu/roms/u-boot/arch/arm/lib/crt0.S
new file mode 100644
index 000000000..dfc2de9a6
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arm/lib/crt0.S
@@ -0,0 +1,123 @@
+/*
+ *  crt0 - C-runtime startup Code for ARM U-Boot
+ *
+ *  Copyright (c) 2012  Albert ARIBAUD <albert.u.boot@aribaud.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm-offsets.h>
+#include <linux/linkage.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 board_init_r().
+ */
+
+/*
+ * entry point of crt0 sequence
+ */
+
+ENTRY(_main)
+
+/*
+ * Set up initial C runtime environment and call board_init_f(0).
+ */
+
+#if 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, sp, #GD_SIZE	/* allocate one GD above SP */
+	bic	sp, sp, #7	/* 8-byte alignment for ABI compliance */
+	mov	r9, 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_moni). Trick here is that we'll return
+ * 'here' but relocated.
+ */
+
+	ldr	sp, [r9, #GD_START_ADDR_SP]	/* sp = gd->start_addr_sp */
+	bic	sp, sp, #7	/* 8-byte alignment for ABI compliance */
+	ldr	r9, [r9, #GD_BD]		/* r9 = gd->bd */
+	sub	r9, r9, #GD_SIZE		/* new GD is below bd */
+
+	adr	lr, here
+	ldr	r0, [r9, #GD_RELOC_OFF]		/* r0 = gd->reloc_off */
+	add	lr, lr, r0
+	ldr	r0, [r9, #GD_RELOCADDR]		/* r0 = 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
+
+	/* call board_init_r(gd_t *id, ulong 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! */
+
+	/* we should not return here. */
+
+#endif
+
+ENDPROC(_main)