From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- arch/sparc/prom/printf.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 arch/sparc/prom/printf.c (limited to 'arch/sparc/prom/printf.c') diff --git a/arch/sparc/prom/printf.c b/arch/sparc/prom/printf.c new file mode 100644 index 000000000..dcee3dfa6 --- /dev/null +++ b/arch/sparc/prom/printf.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * printf.c: Internal prom library printf facility. + * + * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com) + * + * We used to warn all over the code: DO NOT USE prom_printf(), + * and yet people do. Anton's banking code was outputting banks + * with prom_printf for most of the 2.4 lifetime. Since an effective + * stick is not available, we deployed a carrot: an early printk + * through PROM by means of -p boot option. This ought to fix it. + * USE printk; if you need, deploy -p. + */ + +#include +#include +#include + +#include +#include + +#define CONSOLE_WRITE_BUF_SIZE 1024 + +static char ppbuf[1024]; +static char console_write_buf[CONSOLE_WRITE_BUF_SIZE]; +static DEFINE_RAW_SPINLOCK(console_write_lock); + +void notrace prom_write(const char *buf, unsigned int n) +{ + unsigned int dest_len; + unsigned long flags; + char *dest; + + dest = console_write_buf; + raw_spin_lock_irqsave(&console_write_lock, flags); + + dest_len = 0; + while (n-- != 0) { + char ch = *buf++; + if (ch == '\n') { + *dest++ = '\r'; + dest_len++; + } + *dest++ = ch; + dest_len++; + if (dest_len >= CONSOLE_WRITE_BUF_SIZE - 1) { + prom_console_write_buf(console_write_buf, dest_len); + dest = console_write_buf; + dest_len = 0; + } + } + if (dest_len) + prom_console_write_buf(console_write_buf, dest_len); + + raw_spin_unlock_irqrestore(&console_write_lock, flags); +} + +void notrace prom_printf(const char *fmt, ...) +{ + va_list args; + int i; + + va_start(args, fmt); + i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args); + va_end(args); + + prom_write(ppbuf, i); +} -- cgit v1.2.3