595a251c07
sparc64 systems have a restriction in that passing in buffer addressses above 4GB to prom calls is not reliable. We end up violating this when we do prom console writes, because we use an on-stack buffer to translate '\n' into '\r\n'. So instead, do this translation into an intermediate buffer, which is in the kernel image and thus below 4GB, then pass that to the PROM console write calls. On the 32-bit side we don't have to deal with any of these issues, so the new prom_console_write_buf() uses the existing prom_nbputchar() implementation. However we can now mark those routines static. Since the 64-bit side completely uses new code we can delete the putchar bits as they are now completely unused. Signed-off-by: David S. Miller <davem@davemloft.net>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* printf.c: Internal prom library printf facility.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
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*
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* We used to warn all over the code: DO NOT USE prom_printf(),
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* and yet people do. Anton's banking code was outputting banks
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* with prom_printf for most of the 2.4 lifetime. Since an effective
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* stick is not available, we deployed a carrot: an early printk
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* through PROM by means of -p boot option. This ought to fix it.
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* USE printk; if you need, deploy -p.
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*/
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#include <linux/kernel.h>
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#include <linux/compiler.h>
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#include <linux/spinlock.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#define CONSOLE_WRITE_BUF_SIZE 1024
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static char ppbuf[1024];
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static char console_write_buf[CONSOLE_WRITE_BUF_SIZE];
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static DEFINE_RAW_SPINLOCK(console_write_lock);
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void notrace prom_write(const char *buf, unsigned int n)
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{
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unsigned int dest_len;
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unsigned long flags;
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char *dest;
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dest = console_write_buf;
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raw_spin_lock_irqsave(&console_write_lock, flags);
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dest_len = 0;
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while (n-- != 0) {
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char ch = *buf++;
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if (ch == '\n') {
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*dest++ = '\r';
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dest_len++;
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}
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*dest++ = ch;
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dest_len++;
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if (dest_len >= CONSOLE_WRITE_BUF_SIZE - 1) {
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prom_console_write_buf(console_write_buf, dest_len);
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dest = console_write_buf;
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dest_len = 0;
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}
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}
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if (dest_len)
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prom_console_write_buf(console_write_buf, dest_len);
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raw_spin_unlock_irqrestore(&console_write_lock, flags);
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}
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void notrace prom_printf(const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args);
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va_end(args);
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prom_write(ppbuf, i);
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}
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