patch-2.3.99-pre7 linux/arch/ppc/xmon/start_8xx.c

• Lines: 289
• Date: Wed May 3 01:47:57 2000
• Orig file: v2.3.99-pre6/linux/arch/ppc/xmon/start_8xx.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre6/linux/arch/ppc/xmon/start_8xx.c linux/arch/ppc/xmon/start_8xx.c
@@ -0,0 +1,288 @@
+/*
+ * Copyright (C) 1996 Paul Mackerras.
+ * Copyright (C) 2000 Dan Malek.
+ * Quick hack of Paul's code to make XMON work on 8xx processors.  Lots
+ * of assumptions, like the SMC1 is used, it has been initialized by the
+ * loader at some point, and we can just stuff and suck bytes.
+ * We rely upon the 8xx uart driver to support us, as the interface
+ * changes between boot up and operational phases of the kernel.
+ */
+#include <linux/string.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <linux/kernel.h>
+#include <asm/processor.h>
+#include <asm/8xx_immap.h>
+#include <asm/mpc8xx.h>
+#include "commproc.h"
+
+extern void xmon_printf(const char *fmt, ...);
+extern int xmon_8xx_write(char *str, int nb);
+extern int xmon_8xx_read_poll(void);
+extern int xmon_8xx_read_char(void);
+void prom_drawhex(uint);
+void prom_drawstring(const char *str);
+
+static int use_screen = 1; /* default */
+
+#define TB_SPEED	25000000
+
+static inline unsigned int readtb(void)
+{
+	unsigned int ret;
+
+	asm volatile("mftb %0" : "=r" (ret) :);
+	return ret;
+}
+
+void buf_access(void)
+{
+}
+
+void
+xmon_map_scc(void)
+{
+
+	cpmp = (cpm8xx_t *)&(((immap_t *)IMAP_ADDR)->im_cpm);
+	use_screen = 0;
+	
+	prom_drawstring("xmon uses serial port\n");
+}
+
+static int scc_initialized = 0;
+
+void xmon_init_scc(void);
+
+int
+xmon_write(void *handle, void *ptr, int nb)
+{
+	char *p = ptr;
+	int i, c, ct;
+
+	if (!scc_initialized)
+		xmon_init_scc();
+
+	return(xmon_8xx_write(ptr, nb));
+}
+
+int xmon_wants_key;
+
+int
+xmon_read(void *handle, void *ptr, int nb)
+{
+	char *p = ptr;
+	int i;
+
+	if (!scc_initialized)
+		xmon_init_scc();
+
+	for (i = 0; i < nb; ++i) {
+		*p++ = xmon_8xx_read_char();
+	}
+	return i;
+}
+
+int
+xmon_read_poll(void)
+{
+	return(xmon_8xx_read_poll());
+}
+
+void
+xmon_init_scc()
+{
+	scc_initialized = 1;
+}
+
+#if 0
+extern int (*prom_entry)(void *);
+
+int
+xmon_exit(void)
+{
+    struct prom_args {
+	char *service;
+    } args;
+
+    for (;;) {
+	args.service = "exit";
+	(*prom_entry)(&args);
+    }
+}
+#endif
+
+void *xmon_stdin;
+void *xmon_stdout;
+void *xmon_stderr;
+
+void
+xmon_init(void)
+{
+}
+
+int
+xmon_putc(int c, void *f)
+{
+    char ch = c;
+
+    if (c == '\n')
+	xmon_putc('\r', f);
+    return xmon_write(f, &ch, 1) == 1? c: -1;
+}
+
+int
+xmon_putchar(int c)
+{
+    return xmon_putc(c, xmon_stdout);
+}
+
+int
+xmon_fputs(char *str, void *f)
+{
+    int n = strlen(str);
+
+    return xmon_write(f, str, n) == n? 0: -1;
+}
+
+int
+xmon_readchar(void)
+{
+    char ch;
+
+    for (;;) {
+	switch (xmon_read(xmon_stdin, &ch, 1)) {
+	case 1:
+	    return ch;
+	case -1:
+	    xmon_printf("read(stdin) returned -1\r\n", 0, 0);
+	    return -1;
+	}
+    }
+}
+
+static char line[256];
+static char *lineptr;
+static int lineleft;
+
+#if 0
+int xmon_expect(const char *str, unsigned int timeout)
+{
+	int c;
+	unsigned int t0;
+
+	timeout *= TB_SPEED;
+	t0 = readtb();
+	do {
+		lineptr = line;
+		for (;;) {
+			c = xmon_read_poll();
+			if (c == -1) {
+				if (readtb() - t0 > timeout)
+					return 0;
+				continue;
+			}
+			if (c == '\n')
+				break;
+			if (c != '\r' && lineptr < &line[sizeof(line) - 1])
+				*lineptr++ = c;
+		}
+		*lineptr = 0;
+	} while (strstr(line, str) == NULL);
+	return 1;
+}
+#endif
+
+int
+xmon_getchar(void)
+{
+    int c;
+
+    if (lineleft == 0) {
+	lineptr = line;
+	for (;;) {
+	    c = xmon_readchar();
+	    if (c == -1 || c == 4)
+		break;
+	    if (c == '\r' || c == '\n') {
+		*lineptr++ = '\n';
+		xmon_putchar('\n');
+		break;
+	    }
+	    switch (c) {
+	    case 0177:
+	    case '\b':
+		if (lineptr > line) {
+		    xmon_putchar('\b');
+		    xmon_putchar(' ');
+		    xmon_putchar('\b');
+		    --lineptr;
+		}
+		break;
+	    case 'U' & 0x1F:
+		while (lineptr > line) {
+		    xmon_putchar('\b');
+		    xmon_putchar(' ');
+		    xmon_putchar('\b');
+		    --lineptr;
+		}
+		break;
+	    default:
+		if (lineptr >= &line[sizeof(line) - 1])
+		    xmon_putchar('\a');
+		else {
+		    xmon_putchar(c);
+		    *lineptr++ = c;
+		}
+	    }
+	}
+	lineleft = lineptr - line;
+	lineptr = line;
+    }
+    if (lineleft == 0)
+	return -1;
+    --lineleft;
+    return *lineptr++;
+}
+
+char *
+xmon_fgets(char *str, int nb, void *f)
+{
+    char *p;
+    int c;
+
+    for (p = str; p < str + nb - 1; ) {
+	c = xmon_getchar();
+	if (c == -1) {
+	    if (p == str)
+		return 0;
+	    break;
+	}
+	*p++ = c;
+	if (c == '\n')
+	    break;
+    }
+    *p = 0;
+    return str;
+}
+
+void
+prom_drawhex(uint val)
+{
+	unsigned char buf[10];
+
+	int i;
+	for (i = 7;  i >= 0;  i--)
+	{
+		buf[i] = "0123456789abcdef"[val & 0x0f];
+		val >>= 4;
+	}
+	buf[8] = '\0';
+	xmon_fputs(buf, xmon_stdout);
+}
+
+void
+prom_drawstring(const char *str)
+{
+	xmon_fputs(str, xmon_stdout);
+}