GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/common/init/Makefile

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+#
+# Copyright (c) 2015 Google, Inc
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+obj-y += board_init.o
+obj-$(CONFIG_$(SPL_TPL_)HANDOFF) += handoff.o

source/bootloader/u-boot-2020.01/common/init/board_init.c

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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Code shared between SPL and U-Boot proper
+ *
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Unfortunately x86 or ARM can't compile this code as gd cannot be assigned */
+#if !defined(CONFIG_X86) && !defined(CONFIG_ARM)
+__weak void arch_setup_gd(struct global_data *gd_ptr)
+{
+	gd = gd_ptr;
+}
+#endif /* !CONFIG_X86 && !CONFIG_ARM */
+
+/**
+ * This function is called after the position of the initial stack is
+ * determined in gd->start_addr_sp. Boards can override it to set up
+ * stack-checking markers.
+ */
+__weak void board_init_f_init_stack_protection(void)
+{
+#if CONFIG_IS_ENABLED(SYS_REPORT_STACK_F_USAGE)
+	ulong stack_bottom = gd->start_addr_sp -
+		CONFIG_VAL(SIZE_LIMIT_PROVIDE_STACK);
+
+	/* substact some safety margin (0x20) since stack is in use here */
+	memset((void *)stack_bottom, CONFIG_VAL(SYS_STACK_F_CHECK_BYTE),
+	       CONFIG_VAL(SIZE_LIMIT_PROVIDE_STACK) - 0x20);
+#endif
+}
+
+/*
+ * Allocate reserved space for use as 'globals' from 'top' address and
+ * return 'bottom' address of allocated space
+ *
+ * Notes:
+ *
+ * Actual reservation cannot be done from within this function as
+ * it requires altering the C stack pointer, so this will be done by
+ * the caller upon return from this function.
+ *
+ * IMPORTANT:
+ *
+ * Alignment constraints may differ for each 'chunk' allocated. For now:
+ *
+ * - GD is aligned down on a 16-byte boundary
+ *
+ *  - the early malloc arena is not aligned, therefore it follows the stack
+ *   alignment constraint of the architecture for which we are bulding.
+ *
+ *  - GD is allocated last, so that the return value of this functions is
+ *   both the bottom of the reserved area and the address of GD, should
+ *   the calling context need it.
+ */
+
+ulong board_init_f_alloc_reserve(ulong top)
+{
+	/* Reserve early malloc arena */
+#if CONFIG_VAL(SYS_MALLOC_F_LEN)
+	top -= CONFIG_VAL(SYS_MALLOC_F_LEN);
+#endif
+	/* LAST : reserve GD (rounded up to a multiple of 16 bytes) */
+	top = rounddown(top-sizeof(struct global_data), 16);
+
+	return top;
+}
+
+/*
+ * Initialize reserved space (which has been safely allocated on the C
+ * stack from the C runtime environment handling code).
+ *
+ * Notes:
+ *
+ * Actual reservation was done by the caller; the locations from base
+ * to base+size-1 (where 'size' is the value returned by the allocation
+ * function above) can be accessed freely without risk of corrupting the
+ * C runtime environment.
+ *
+ * IMPORTANT:
+ *
+ * Upon return from the allocation function above, on some architectures
+ * the caller will set gd to the lowest reserved location. Therefore, in
+ * this initialization function, the global data MUST be placed at base.
+ *
+ * ALSO IMPORTANT:
+ *
+ * On some architectures, gd will already be good when entering this
+ * function. On others, it will only be good once arch_setup_gd() returns.
+ * Therefore, global data accesses must be done:
+ *
+ * - through gd_ptr if before the call to arch_setup_gd();
+ *
+ * - through gd once arch_setup_gd() has been called.
+ *
+ * Do not use 'gd->' until arch_setup_gd() has been called!
+ *
+ * IMPORTANT TOO:
+ *
+ * Initialization for each "chunk" (GD, early malloc arena...) ends with
+ * an incrementation line of the form 'base += <some size>'. The last of
+ * these incrementations seems useless, as base will not be used any
+ * more after this incrementation; but if/when a new "chunk" is appended,
+ * this increment will be essential as it will give base right value for
+ * this new chunk (which will have to end with its own incrementation
+ * statement). Besides, the compiler's optimizer will silently detect
+ * and remove the last base incrementation, therefore leaving that last
+ * (seemingly useless) incrementation causes no code increase.
+ */
+
+void board_init_f_init_reserve(ulong base)
+{
+	struct global_data *gd_ptr;
+
+	/*
+	 * clear GD entirely and set it up.
+	 * Use gd_ptr, as gd may not be properly set yet.
+	 */
+
+	gd_ptr = (struct global_data *)base;
+	/* zero the area */
+	memset(gd_ptr, '\0', sizeof(*gd));
+	/* set GD unless architecture did it already */
+#if !defined(CONFIG_ARM)
+	arch_setup_gd(gd_ptr);
+#endif
+	/* next alloc will be higher by one GD plus 16-byte alignment */
+	base += roundup(sizeof(struct global_data), 16);
+
+	/*
+	 * record early malloc arena start.
+	 * Use gd as it is now properly set for all architectures.
+	 */
+
+#if CONFIG_VAL(SYS_MALLOC_F_LEN)
+	/* go down one 'early malloc arena' */
+	gd->malloc_base = base;
+	/* next alloc will be higher by one 'early malloc arena' size */
+	base += CONFIG_VAL(SYS_MALLOC_F_LEN);
+#endif
+
+	if (CONFIG_IS_ENABLED(SYS_REPORT_STACK_F_USAGE))
+		board_init_f_init_stack_protection();
+}
+
+/*
+ * Board-specific Platform code can reimplement show_boot_progress () if needed
+ */
+__weak void show_boot_progress(int val) {}

source/bootloader/u-boot-2020.01/common/init/handoff.c

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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Passing basic information from SPL to U-Boot proper
+ *
+ * Copyright 2018 Google, Inc
+ */
+
+#include <common.h>
+#include <handoff.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void handoff_save_dram(struct spl_handoff *ho)
+{
+	ho->ram_size = gd->ram_size;
+#ifdef CONFIG_NR_DRAM_BANKS
+	{
+		struct bd_info *bd = gd->bd;
+		int i;
+
+		for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+			ho->ram_bank[i].start = bd->bi_dram[i].start;
+			ho->ram_bank[i].size = bd->bi_dram[i].size;
+		}
+	}
+#endif
+}
+
+void handoff_load_dram_size(struct spl_handoff *ho)
+{
+	gd->ram_size = ho->ram_size;
+}
+
+void handoff_load_dram_banks(struct spl_handoff *ho)
+{
+#ifdef CONFIG_NR_DRAM_BANKS
+	{
+		struct bd_info *bd = gd->bd;
+		int i;
+
+		for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+			bd->bi_dram[i].start = ho->ram_bank[i].start;
+			bd->bi_dram[i].size = ho->ram_bank[i].size;
+		}
+	}
+#endif
+}