Attachment 146392 Details for Bug 144234 – bounce_buffer_1.patch

[patch] bounce_buffer_1.patch

file_144234.txt (text/plain), 1.06 KB, created by John Baldwin on 2014-08-27 20:10:38 UTC

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Creator: John Baldwin

Created: 2014-08-27 20:10:38 UTC

Size: 1.06 KB

patch

obsolete

>--- //depot/user/jhb/boot/sys/boot/i386/common/drv.c	2014-08-27 19:53:55.000000000 0000
>+++ /home/jhb/work/p4/boot/sys/boot/i386/common/drv.c	2014-08-27 19:53:55.000000000 0000
>@@ -54,11 +54,37 @@
> 
> #ifndef USE_XREAD
> static struct edd_packet packet;
>+static char bounce_buffer[512];
>+
>+static int drvread_one(struct dsk *, void *, daddr_t, unsigned);
> #endif
> 
> int
> drvread(struct dsk *dskp, void *buf, daddr_t lba, unsigned nblk)
> {
>+#ifndef USE_XREAD
>+	int i;
>+
>+	/* If the buffer is below 1MB, pass it through directly. */
>+	if (VTOP((char *)buf + nblk * 512) >> 20 == 0)
>+		return (drvread_one(dskp, buf, lba, nblk));
>+
>+	/*
>+	 * Use the bounce buffer to transfer the data one sector at a
>+	 * time.
>+	 */
>+	for (i = 0; i < nblk; i++) {
>+		if (drvread_one(dskp, bounce_buffer, lba + i, 1) < 0)
>+			return (-1);
>+		memcpy((char *)buf + 512 * i, bounce_buffer, 512);
>+	}
>+	return (0);
>+}
>+
>+static int
>+drvread_one(struct dsk *dskp, void *buf, daddr_t lba, unsigned nblk)
>+{
>+#endif
> 	static unsigned c = 0x2d5c7c2f;
> 	int retries = 3;
>

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