1 files changed, 268 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/arch/blackfin/lib/string.c b/qemu/roms/u-boot/arch/blackfin/lib/string.c
new file mode 100644
index 000000000..f0a061b47
--- /dev/null
+++ b/qemu/roms/u-boot/arch/blackfin/lib/string.c
@@ -0,0 +1,268 @@
+/*
+ * U-boot - string.c Contains library routines.
+ *
+ * Copyright (c) 2005-2008 Analog Devices Inc.
+ *
+ * (C) Copyright 2000-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <config.h>
+#include <asm/blackfin.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+char *strcpy(char *dest, const char *src)
+{
+	char *xdest = dest;
+	char temp = 0;
+
+	__asm__ __volatile__ (
+		"1:\t%2 = B [%1++] (Z);\n\t"
+		"B [%0++] = %2;\n\t"
+		"CC = %2;\n\t"
+		"if cc jump 1b (bp);\n"
+		: "=a"(dest), "=a"(src), "=d"(temp)
+		: "0"(dest), "1"(src), "2"(temp)
+		: "memory");
+
+	return xdest;
+}
+
+char *strncpy(char *dest, const char *src, size_t n)
+{
+	char *xdest = dest;
+	char temp = 0;
+
+	if (n == 0)
+		return xdest;
+
+	__asm__ __volatile__ (
+		"1:\t%3 = B [%1++] (Z);\n\t"
+		"B [%0++] = %3;\n\t"
+		"CC = %3;\n\t"
+		"if ! cc jump 2f;\n\t"
+		"%2 += -1;\n\t"
+		"CC = %2 == 0;\n\t"
+		"if ! cc jump 1b (bp);\n"
+		"2:\n"
+		: "=a"(dest), "=a"(src), "=da"(n), "=d"(temp)
+		: "0"(dest), "1"(src), "2"(n), "3"(temp)
+		: "memory");
+
+	return xdest;
+}
+
+int strcmp(const char *cs, const char *ct)
+{
+	char __res1, __res2;
+
+	__asm__ (
+		"1:\t%2 = B[%0++] (Z);\n\t"	/* get *cs */
+		"%3 = B[%1++] (Z);\n\t"	/* get *ct */
+		"CC = %2 == %3;\n\t"	/* compare a byte */
+		"if ! cc jump 2f;\n\t"	/* not equal, break out */
+		"CC = %2;\n\t"	/* at end of cs? */
+		"if cc jump 1b (bp);\n\t"	/* no, keep going */
+		"jump.s 3f;\n"	/* strings are equal */
+		"2:\t%2 = %2 - %3;\n"	/* *cs - *ct */
+		"3:\n"
+		: "=a"(cs), "=a"(ct), "=d"(__res1), "=d"(__res2)
+		: "0"(cs), "1"(ct));
+
+	return __res1;
+}
+
+int strncmp(const char *cs, const char *ct, size_t count)
+{
+	char __res1, __res2;
+
+	if (!count)
+		return 0;
+
+	__asm__(
+		"1:\t%3 = B[%0++] (Z);\n\t"	/* get *cs */
+		"%4 = B[%1++] (Z);\n\t"	/* get *ct */
+		"CC = %3 == %4;\n\t"	/* compare a byte */
+		"if ! cc jump 3f;\n\t"	/* not equal, break out */
+		"CC = %3;\n\t"	/* at end of cs? */
+		"if ! cc jump 4f;\n\t"	/* yes, all done */
+		"%2 += -1;\n\t"	/* no, adjust count */
+		"CC = %2 == 0;\n\t" "if ! cc jump 1b;\n"	/* more to do, keep going */
+		"2:\t%3 = 0;\n\t"	/* strings are equal */
+		"jump.s    4f;\n" "3:\t%3 = %3 - %4;\n"	/* *cs - *ct */
+		"4:"
+		: "=a"(cs), "=a"(ct), "=da"(count), "=d"(__res1), "=d"(__res2)
+		: "0"(cs), "1"(ct), "2"(count));
+
+	return __res1;
+}
+
+#ifdef MDMA1_D0_NEXT_DESC_PTR
+# define MDMA_D0_NEXT_DESC_PTR MDMA1_D0_NEXT_DESC_PTR
+# define MDMA_S0_NEXT_DESC_PTR MDMA1_S0_NEXT_DESC_PTR
+#endif
+
+static void dma_calc_size(unsigned long ldst, unsigned long lsrc, size_t count,
+			unsigned long *dshift, unsigned long *bpos)
+{
+	unsigned long limit;
+
+#ifdef MSIZE
+	/* The max memory DMA memory transfer size is 32 bytes. */
+	limit = 5;
+	*dshift = MSIZE_P;
+#else
+	/* The max memory DMA memory transfer size is 4 bytes. */
+	limit = 2;
+	*dshift = WDSIZE_P;
+#endif
+
+	*bpos = min(limit, ffs(ldst | lsrc | count)) - 1;
+}
+
+/* This version misbehaves for count values of 0 and 2^16+.
+ * Perhaps we should detect that ?  Nowhere do we actually
+ * use dma memcpy for those types of lengths though ...
+ */
+void dma_memcpy_nocache(void *dst, const void *src, size_t count)
+{
+	struct dma_register *mdma_d0 = (void *)MDMA_D0_NEXT_DESC_PTR;
+	struct dma_register *mdma_s0 = (void *)MDMA_S0_NEXT_DESC_PTR;
+	unsigned long ldst = (unsigned long)dst;
+	unsigned long lsrc = (unsigned long)src;
+	unsigned long dshift, bpos;
+	uint32_t dsize, mod;
+
+	/* Disable DMA in case it's still running (older u-boot's did not
+	 * always turn them off).  Do it before the if statement below so
+	 * we can be cheap and not do a SSYNC() due to the forced abort.
+	 */
+	bfin_write(&mdma_d0->config, 0);
+	bfin_write(&mdma_s0->config, 0);
+	bfin_write(&mdma_d0->status, DMA_RUN | DMA_DONE | DMA_ERR);
+
+	/* Scratchpad cannot be a DMA source or destination */
+	if ((lsrc >= L1_SRAM_SCRATCH && lsrc < L1_SRAM_SCRATCH_END) ||
+	    (ldst >= L1_SRAM_SCRATCH && ldst < L1_SRAM_SCRATCH_END))
+		hang();
+
+	dma_calc_size(ldst, lsrc, count, &dshift, &bpos);
+	dsize = bpos << dshift;
+	count >>= bpos;
+	mod = 1 << bpos;
+
+#ifdef PSIZE
+	/* The max memory DMA peripheral transfer size is 4 bytes. */
+	dsize |= min(2, bpos) << PSIZE_P;
+#endif
+
+	/* Copy sram functions from sdram to sram */
+	/* Setup destination start address */
+	bfin_write(&mdma_d0->start_addr, ldst);
+	/* Setup destination xcount */
+	bfin_write(&mdma_d0->x_count, count);
+	/* Setup destination xmodify */
+	bfin_write(&mdma_d0->x_modify, mod);
+
+	/* Setup Source start address */
+	bfin_write(&mdma_s0->start_addr, lsrc);
+	/* Setup Source xcount */
+	bfin_write(&mdma_s0->x_count, count);
+	/* Setup Source xmodify */
+	bfin_write(&mdma_s0->x_modify, mod);
+
+	/* Enable source DMA */
+	bfin_write(&mdma_s0->config, dsize | DMAEN);
+	bfin_write(&mdma_d0->config, dsize | DMAEN | WNR | DI_EN);
+	SSYNC();
+
+	while (!(bfin_read(&mdma_d0->status) & DMA_DONE))
+		continue;
+
+	bfin_write(&mdma_d0->status, DMA_RUN | DMA_DONE | DMA_ERR);
+	bfin_write(&mdma_d0->config, 0);
+	bfin_write(&mdma_s0->config, 0);
+}
+/* We should do a dcache invalidate on the destination after the dma, but since
+ * we lack such hardware capability, we'll flush/invalidate the destination
+ * before the dma and bank on the idea that u-boot is single threaded.
+ */
+void *dma_memcpy(void *dst, const void *src, size_t count)
+{
+	if (dcache_status()) {
+		blackfin_dcache_flush_range(src, src + count);
+		blackfin_dcache_flush_invalidate_range(dst, dst + count);
+	}
+
+	dma_memcpy_nocache(dst, src, count);
+
+	if (icache_status())
+		blackfin_icache_flush_range(dst, dst + count);
+
+	return dst;
+}
+
+/*
+ * memcpy - Copy one area of memory to another
+ * @dest: Where to copy to
+ * @src: Where to copy from
+ * @count: The size of the area.
+ *
+ * We need to have this wrapper in memcpy() as common code may call memcpy()
+ * to load up L1 regions.  Consider loading an ELF which has sections with
+ * LMA's pointing to L1.  The common code ELF loader will simply use memcpy()
+ * to move the ELF's sections into the right place.  We need to catch that
+ * here and redirect to dma_memcpy().
+ */
+extern void *memcpy_ASM(void *dst, const void *src, size_t count);
+void *memcpy(void *dst, const void *src, size_t count)
+{
+	if (!count)
+		return dst;
+
+#ifdef CONFIG_CMD_KGDB
+	if (src >= (void *)SYSMMR_BASE) {
+		if (count == 2 && (unsigned long)src % 2 == 0) {
+			u16 mmr = bfin_read16(src);
+			memcpy(dst, &mmr, sizeof(mmr));
+			return dst;
+		}
+		if (count == 4 && (unsigned long)src % 4 == 0) {
+			u32 mmr = bfin_read32(src);
+			memcpy(dst, &mmr, sizeof(mmr));
+			return dst;
+		}
+		/* Failed for some reason */
+		memset(dst, 0xad, count);
+		return dst;
+	}
+	if (dst >= (void *)SYSMMR_BASE) {
+		if (count == 2 && (unsigned long)dst % 2 == 0) {
+			u16 mmr;
+			memcpy(&mmr, src, sizeof(mmr));
+			bfin_write16(dst, mmr);
+			return dst;
+		}
+		if (count == 4 && (unsigned long)dst % 4 == 0) {
+			u32 mmr;
+			memcpy(&mmr, src, sizeof(mmr));
+			bfin_write32(dst, mmr);
+			return dst;
+		}
+		/* Failed for some reason */
+		memset(dst, 0xad, count);
+		return dst;
+	}
+#endif
+
+	/* if L1 is the source or dst, use DMA */
+	if (addr_bfin_on_chip_mem(dst) || addr_bfin_on_chip_mem(src))
+		return dma_memcpy(dst, src, count);
+	else
+		/* No L1 is involved, so just call regular memcpy */
+		return memcpy_ASM(dst, src, count);
+}