arch/powerpc/xmon/nonstdio.c

Source file repositories/reference/linux-study-clean/arch/powerpc/xmon/nonstdio.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/xmon/nonstdio.c
Extension
.c
Size
3152 bytes
Lines
189
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

while (paginating && (q = strchr(p, '\n'))) {
			rv += udbg_write(p, q - p + 1);
			p = q + 1;
			paginate_pos++;

			if (paginate_pos >= paginate_lpp) {
				udbg_write(msg, strlen(msg));

				switch (xmon_readchar()) {
				case 'a':
					paginating = false;
					break;
				case 'q':
					paginate_skipping = true;
					break;
				default:
					/* nothing */
					break;
				}

				paginate_pos = 0;
				udbg_write("\r\n", 2);

				if (paginate_skipping)
					return nb;
			}
		}
	}

	return rv + udbg_write(p, nb - (p - ptr));
}

int xmon_putchar(int c)
{
	char ch = c;

	if (c == '\n')
		xmon_putchar('\r');
	return xmon_write(&ch, 1) == 1? c: -1;
}

static char line[256];
static char *lineptr;
static int lineleft;

static 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;
	}

Annotation

Implementation Notes