mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
287 lines
4.4 KiB
C
287 lines
4.4 KiB
C
/*
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* Copyright (C) 1996 Paul Mackerras.
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* Copyright (C) 2000 Dan Malek.
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* Quick hack of Paul's code to make XMON work on 8xx processors. Lots
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* of assumptions, like the SMC1 is used, it has been initialized by the
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* loader at some point, and we can just stuff and suck bytes.
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* We rely upon the 8xx uart driver to support us, as the interface
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* changes between boot up and operational phases of the kernel.
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*/
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#include <linux/string.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#include <asm/page.h>
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#include <linux/kernel.h>
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#include <asm/8xx_immap.h>
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#include <asm/mpc8xx.h>
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#include <asm/commproc.h>
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extern void xmon_printf(const char *fmt, ...);
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extern int xmon_8xx_write(char *str, int nb);
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extern int xmon_8xx_read_poll(void);
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extern int xmon_8xx_read_char(void);
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void prom_drawhex(uint);
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void prom_drawstring(const char *str);
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static int use_screen = 1; /* default */
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#define TB_SPEED 25000000
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static inline unsigned int readtb(void)
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{
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unsigned int ret;
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asm volatile("mftb %0" : "=r" (ret) :);
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return ret;
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}
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void buf_access(void)
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{
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}
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void
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xmon_map_scc(void)
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{
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cpmp = (cpm8xx_t *)&(((immap_t *)IMAP_ADDR)->im_cpm);
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use_screen = 0;
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prom_drawstring("xmon uses serial port\n");
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}
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static int scc_initialized = 0;
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void xmon_init_scc(void);
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int
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xmon_write(void *handle, void *ptr, int nb)
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{
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char *p = ptr;
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int i, c, ct;
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if (!scc_initialized)
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xmon_init_scc();
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return(xmon_8xx_write(ptr, nb));
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}
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int xmon_wants_key;
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int
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xmon_read(void *handle, void *ptr, int nb)
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{
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char *p = ptr;
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int i;
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if (!scc_initialized)
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xmon_init_scc();
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for (i = 0; i < nb; ++i) {
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*p++ = xmon_8xx_read_char();
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}
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return i;
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}
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int
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xmon_read_poll(void)
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{
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return(xmon_8xx_read_poll());
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}
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void
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xmon_init_scc()
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{
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scc_initialized = 1;
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}
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#if 0
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extern int (*prom_entry)(void *);
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int
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xmon_exit(void)
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{
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struct prom_args {
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char *service;
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} args;
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for (;;) {
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args.service = "exit";
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(*prom_entry)(&args);
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}
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}
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#endif
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void *xmon_stdin;
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void *xmon_stdout;
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void *xmon_stderr;
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void
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xmon_init(void)
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{
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}
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int
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xmon_putc(int c, void *f)
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{
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char ch = c;
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if (c == '\n')
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xmon_putc('\r', f);
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return xmon_write(f, &ch, 1) == 1? c: -1;
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}
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int
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xmon_putchar(int c)
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{
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return xmon_putc(c, xmon_stdout);
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}
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int
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xmon_fputs(char *str, void *f)
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{
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int n = strlen(str);
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return xmon_write(f, str, n) == n? 0: -1;
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}
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int
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xmon_readchar(void)
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{
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char ch;
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for (;;) {
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switch (xmon_read(xmon_stdin, &ch, 1)) {
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case 1:
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return ch;
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case -1:
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xmon_printf("read(stdin) returned -1\r\n", 0, 0);
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return -1;
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}
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}
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}
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static char line[256];
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static char *lineptr;
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static int lineleft;
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#if 0
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int xmon_expect(const char *str, unsigned int timeout)
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{
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int c;
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unsigned int t0;
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timeout *= TB_SPEED;
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t0 = readtb();
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do {
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lineptr = line;
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for (;;) {
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c = xmon_read_poll();
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if (c == -1) {
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if (readtb() - t0 > timeout)
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return 0;
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continue;
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}
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if (c == '\n')
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break;
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if (c != '\r' && lineptr < &line[sizeof(line) - 1])
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*lineptr++ = c;
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}
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*lineptr = 0;
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} while (strstr(line, str) == NULL);
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return 1;
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}
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#endif
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int
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xmon_getchar(void)
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{
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int c;
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if (lineleft == 0) {
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lineptr = line;
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for (;;) {
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c = xmon_readchar();
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if (c == -1 || c == 4)
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break;
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if (c == '\r' || c == '\n') {
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*lineptr++ = '\n';
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xmon_putchar('\n');
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break;
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}
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switch (c) {
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case 0177:
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case '\b':
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if (lineptr > line) {
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xmon_putchar('\b');
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xmon_putchar(' ');
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xmon_putchar('\b');
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--lineptr;
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}
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break;
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case 'U' & 0x1F:
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while (lineptr > line) {
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xmon_putchar('\b');
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xmon_putchar(' ');
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xmon_putchar('\b');
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--lineptr;
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}
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break;
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default:
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if (lineptr >= &line[sizeof(line) - 1])
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xmon_putchar('\a');
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else {
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xmon_putchar(c);
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*lineptr++ = c;
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}
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}
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}
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lineleft = lineptr - line;
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lineptr = line;
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}
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if (lineleft == 0)
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return -1;
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--lineleft;
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return *lineptr++;
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}
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char *
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xmon_fgets(char *str, int nb, void *f)
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{
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char *p;
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int c;
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for (p = str; p < str + nb - 1; ) {
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c = xmon_getchar();
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if (c == -1) {
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if (p == str)
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return 0;
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break;
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}
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*p++ = c;
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if (c == '\n')
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break;
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}
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*p = 0;
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return str;
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}
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void
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prom_drawhex(uint val)
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{
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unsigned char buf[10];
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int i;
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for (i = 7; i >= 0; i--)
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{
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buf[i] = "0123456789abcdef"[val & 0x0f];
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val >>= 4;
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}
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buf[8] = '\0';
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xmon_fputs(buf, xmon_stdout);
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}
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void
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prom_drawstring(const char *str)
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{
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xmon_fputs(str, xmon_stdout);
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}
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